CA2579467C - Pump set with secure loading features - Google Patents

Pump set with secure loading features Download PDF

Info

Publication number
CA2579467C
CA2579467C CA2579467A CA2579467A CA2579467C CA 2579467 C CA2579467 C CA 2579467C CA 2579467 A CA2579467 A CA 2579467A CA 2579467 A CA2579467 A CA 2579467A CA 2579467 C CA2579467 C CA 2579467C
Authority
CA
Canada
Prior art keywords
electromagnetic radiation
pump
detector
interlock device
source
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CA2579467A
Other languages
French (fr)
Other versions
CA2579467A1 (en
Inventor
Joel D. Wiesner
Christopher A. Knauper
James M. Harr
James G. Hanlon
Joseph A. Hudson
Ricky A. Sisk
Robert B. Gaines
Kevin C. Meier
Glenn G. Fournie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cardinal Health 529 LLC
Original Assignee
Covidien AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Covidien AG filed Critical Covidien AG
Publication of CA2579467A1 publication Critical patent/CA2579467A1/en
Application granted granted Critical
Publication of CA2579467C publication Critical patent/CA2579467C/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • A61M5/14212Pumping with an aspiration and an expulsion action
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M31/00Devices for introducing or retaining media, e.g. remedies, in cavities of the body
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/14Detection of the presence or absence of a tube, a connector or a container in an apparatus
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00General characteristics of the apparatus
    • A61M2205/33Controlling, regulating or measuring
    • A61M2205/3306Optical measuring means
    • A61M2205/3313Optical measuring means used specific wavelengths
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61MDEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/142Pressure infusion, e.g. using pumps
    • A61M5/14212Pumping with an aspiration and an expulsion action
    • A61M5/14232Roller pumps

Abstract

A pump set for use with a pump to deliver a supply of liquid to a patient. The feeding set has a conduit for the nutrient liquid and a safety interlock device associated with the conduit. The pumping apparatus has a pumping device and a control system for controlling operation of the pump. An electromagnetic radiation source is operatively connected to the control system of the pump for emitting an electromagnetic radiation signal in a direction for striking the safety interlock device of the feeding set. The safety interlock device is adapted to affect the direction of the electromagnetic radiation. An electromagnetic radiation detector is operatively connected to the control system for receiving the electromagnetic radiation signal when the direction is affected by the safety interlock device, and providing an indication to the control system that the feeding set conduit is properly positioned in the feeding pump.

Description

PUMP SET WITH SECURE LOADING FEATURES
BACKGROUND
[0001] This invention relates generally to pump sets to deliver fluids to patients by way of a flow control apparatus, and more particularly to a pump set having a safety interlock device for determining secure loading of the pump set on the pump.
[0002] Administering fluids containing medicine or nutrition to a patient is well known in the art. Fluids can be delivered to patients by gravity flow, but often are delivered to the patient by a pump set loaded on a flow control apparatus, such as a peristaltic pump, which delivers fluid to the patient at a controlled rate of delivery. A peristaltic pump usually comprises a housing that includes a rotor or the like operatively engaged to at least one motor through a gearbox. The rotor drives fluid through the tubing of the pump set by the peristaltic action effected by rotation of the rotor by the motor. The motor is operatively connected to a rotatable shaft that drives the rotor, which in turn progressively compresses the tubing and drives the fluid at a controlled rate through the pump set. A controller operates the motor to drive the rotor. Other types of peristaltic pumps not employing rotors are also known.
[0003] In order for the pump to deliver an accurate amount of fluid corresponding with the flow parameters programmed into the pump, the administration feeding set must be correctly loaded on the pump. If the pump set is misaligned in the pump, the pump may deliver an inaccurate amount of fluid to a patient or the pump generates a low flow alarm requiring the condition to be examined and the set reloaded. Existing pumps have systems to detect whether the pump set is properly loaded. An example of such a pump having a detection system is shown in co-assigned U.S. Patent No. 4,913,703, entitled SAFETY INTERLOCK
SYSTEM
FOR MEDICAL FLUID PUMPS. This system uses a magnet on the pump set which is detected by circuitry in the pump. It would be desirable to provide a pump set that can be detected but which does not require each pump set to have a magnet.

SUMMARY OF INVENTION
[0004] In one aspect of the present invention, there is disclosed a feeding set for use in 3o an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump. The feeding set generally comprises a conduit for carrying the liquid nutrient to a patient, and a safety interlock device connected to the conduit and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation. The safety interlock device comprises a propagation affecting member including an outer member formed of a material that transmits infrared radiation and blocks visible light and an inner member defining an inner boundary region that substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation. Upon proper loading of the safety interlock device on the pump, the safety interlock device guides infrared radiation to the infrared radiation detector by internally reflecting the infrared radiation and prevents visible light from reaching the visible light detector.
[0004a] In some embodiments, the inner member is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
[0004b] In some embodiments, the inner member is white in color.
[0004c] In some embodiments, the inner boundary region is a polished surface.
[0004d] In some embodiments, the outer member has an opening that receives the conduit.
[0004e] In some embodiments, the propagation affecting member is adapted to pass the liquid nutrient therethrough.
[0004f] In some embodiments, the outer member is adapted to diffuse infrared radiation within the outer member.
[0004g] In some embodiments, the safety interlock device includes a key engageable with the enteral feeding pump to orient the safety interlock device in a predetermined position when mounted on the pump.
[0004h] In some embodiments, the infrared radiation is twice reflected before being detected by the first detector.
[0005] In another aspect of the present invention, there is disclosed a feeding set for use in an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump. The feeding set generally comprises conduit means for carrying the liquid nutrient to a patient and interlock means for locating the feeding set on the pump. The interlock means is connected to the conduit means and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation. The interlock means comprises a propagation affecting member including an outer member formed of a material that transmits infrared radiation and blocks visible light and an inner member defining an inner boundary region that substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation. Upon proper loading of the interlock means on the pump, the interlock means guides infrared radiation to the infrared radiation detector by internally reflecting the infrared radiation and prevents visible light from reaching the visible light detector.
[0006] In yet another aspect of the present invention, there is disclosed a pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for detecting electromagnetic radiation generally of a first wavelength and providing an indication that the pump set is properly loaded on the pumping apparatus, and a second electromagnetic radiation detector for detecting electromagnetic radiation generally of a second wavelength different from the first wavelength and providing an indication that the pump set is not properly loaded on the pumping apparatus.
The pump set generally comprises a conduit for carrying fluid to a patient and a safety interlock device associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation. The safety interlock device is adapted to transmit therethrough electromagnetic radiation of the first wavelength, and adapted not to transmit the electromagnetic radiation of the second wavelength. Upon proper loading of the safety interlock device on the pumping apparatus the safety interlock device guides electromagnetic radiation of the first wavelength to the first detector and prevents electromagnetic radiation of the second wavelength from reaching the second detector.
[0006a] In some embodiments, the first wavelength is generally in the infrared range of electromagnetic radiation and the second wavelength is generally in at least one of the visible range and the ultraviolet range of electromagnetic radiation.
[0006b] In some embodiments, the safety interlock device is formed of a material that filters out visible light and transmits infrared radiation.
[0006c] In some embodiments, the safety interlock device comprises an outer layer for filtering out visible light and an inner layer that transmits both visible light and infrared radiation.
[0006d] In some embodiments, the safety interlock device diffuses electromagnetic radiation of the first wavelength to guide it to the first detector.
[0006e] In some embodiments, the safety interlock device internally reflects the diffused electromagnetic radiation to guide it to the first detector.
10006f] In some embodiments, the safety interlock device refracts electromagnetic radiation of the first wavelength to guide it to the first detector.
[0006g] In some embodiments, the safety interlock device internally reflects electromagnetic radiation of the first wavelength along a path to guide it to the first detector.
[0006h] In some embodiments, the safety interlock device comprises a reflective surface adapted to reflect the electromagnetic radiation.
[0006i] In some embodiments, the safety interlock device has an angled surface shaped to reflect radiation of the first wavelength at an angle to impinge the first detector.
[0006j] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member having a top surface, a bottom surface and a side surface, the top and bottom surfaces being covered with a layer of material opaque to the radiation of the first wavelength and the side being free of material opaque to radiation of the first wavelength.
[0006k] In some embodiments, the pump set is combined with the pumping apparatus.
[0007] In still another aspect of the present invention, there is disclosed a pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for providing an indication that the pump set is properly loaded on the pumping apparatus, and a second electromagnetic radiation detector for detecting electromagnetic radiation. The pump generally comprises a conduit for carrying fluid to a patient and a safety interlock device associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation. The safety interlock device is transmissive to the electromagnetic radiation that can be detected by the first detector. At least a portion of the safety interlock device comprises a material opaque to the transmission of electromagnetic radiation that can be detected by the second detector, so that upon proper loading of the safety interlock device on the pumping apparatus the safety interlock device guides the electromagnetic radiation to the first detector and prevents the electromagnetic radiation that can be detected by the second detector from reaching the second detector.
[0007a] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member including a blocking portion adapted to block emissions of electromagnetic radiation from the electromagnetic radiation propagation affecting member at a selected location of the member.
[0007b] In some embodiments, the safety interlock device is adapted for keyed engagement with the pumping apparatus for positioning the safety interlock device in a predetermined orientation on the pumping apparatus.
[0007c] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member including a material that diffuses electromagnetic 4a radiation received from the source of electromagnetic radiation for guiding the electromagnetic radiation to the first detector.
10007d] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member adapted to refract the electromagnetic radiation from the source of electromagnetic radiation to the first detector.
[0007e] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member including a reflector to reflect the electromagnetic radiation to the first detector.
[0007f] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member including a light pipe for the passage of the electromagnetic radiation to the first detector.
[0007g] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member including a material that is opaque to visible light and allows transmission of infrared radiation therethrough.
[0007h] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member having at least one hole therein sized and positioned to diffract electromagnetic radiation from the source of electromagnetic radiation.
[0008] In a further aspect of the present invention, there is disclosed a pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, an electromagnetic radiation detector operatively connected to the control system for providing an indication that the pump set is properly loaded on the pumping apparatus. The pump set generally comprises a conduit for carrying fluid to a patient and an electromagnetic radiation propagation affecting member associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation.
The propagation affecting member comprises an outer member formed of a material that is transmissive to electromagnetic radiation and an inner boundary region that substantially reflects the electromagnetic radiation.

4b [0008a] In some embodiments, the inner boundary region extends substantially around a longitudinal axis of the conduit.
[0008b] In some embodiments, the inner boundary region is defined by an inner member.

[0008c] In some embodiments, the inner member and the outer member are formed of different materials.
[0008d] In some embodiments, the inner member is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
[0008e] In some embodiments, the inner member is white in color.
[0008f] In some embodiments, the inner boundary region is a polished surface.
[0008g] In some embodiments, the outer member has an opening that receives the conduit.
[0008h] In some embodiments, the propagation affecting member is adapted to pass fluid therethrough.
[0009] In still a further aspect of the present invention, a pump set generally comprises a conduit for carrying fluid to a patient, and an electromagnetic radiation propagation affecting member associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation. The propagation affecting member comprises an outer member formed of a material that is transmissive to electromagnetic radiation and an inner boundary region that substantially reflects the electromagnetic radiation.
[0009a] In still a further aspect of the present invention, there is disclosed a feeding set for use in an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump, the feeding set comprising: a conduit for carrying the liquid nutrient to a patient; a safety interlock device 4c connected to the conduit and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation, and a second source, the second source being a visible light emitter, the safety interlock device comprising a propagation affecting member that transmits infrared radiation and blocks visible light and the member substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation, wherein upon proper loading of the safety interlock device on the pump the safety interlock device guides infrared radiation to the first detector and prevents visible light from reaching the second detector.

[0009b] In some embodiments, the feeding set further comprises an inner member that is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
[0009c] In some embodiments, the inner member is white in color.
[0009d] In some embodiments, the safety interlock device has an opening that receives the conduit.
[0009e] In some embodiments, the propagation affecting member is adapted to pass the liquid nutrient therethrough.
[0009f] In some embodiments, the safety interlock device includes a key engageable with the enteral feeding pump to orient the safety interlock device in a predetermined position when mounted on the pump.
[0009g] In some embodiments, the safety interlock device comprises an outer layer for filtering out visible light and an inner layer that transmits both visible light and infrared radiation.
[0009h] In some embodiments, the safety interlock device diffuses infrared radiation to guide it to the first detector.
[0009i] In some embodiments, the safety interlock device internally reflects the diffused infrared radiation to guide it to the first detector.
[0009j] In some embodiments, the safety interlock device refracts infrared radiation to guide it to the first detector.
[0009k] In some embodiments, the safety interlock device internally reflects infrared radiation along a path to guide it to the first detector.

4d [00091] In some embodiments, the safety interlock device comprises a reflective surface adapted to reflect the infrared radiation.
[0009m] In some embodiments, the safety interlock device has an angled surface shaped to reflect infrared radiation at an angle to impinge the first detector.
10009n] In some embodiments, the propagation affecting member comprises an electromagnetic radiation propagation affecting member having a top surface, a bottom surface and a side surface, the top and bottom surfaces being covered with a layer of material opaque to the infrared radiation and the side surface being free of material opaque to infrared radiation.
[00090] In some embodiments, the feeding set is combined with the pump.
[0009p] In some embodiments, at least a portion of the safety interlock device is opaque to the infrared radiation from the source of electromagnetic radiation, the opaque portion having at least one hole therethrough for diffracting the infrared radiation from the source so that the infrared radiation impinges both the first and second detector.
[0009q] In some embodiments, the electromagnetic radiation propagation affecting member is associated with the conduit and is adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation, the propagation affecting member comprising an outer member formed of a material that is transmissive to electromagnetic radiation and an inner boundary region that substantially reflects the electromagnetic radiation.
[0009r] In another aspect of the present invention, there is disclosed an enteral feeding pump for use with a feeding set having a conduit to deliver a supply of liquid nutrient to a patient and a safety interlock device associated with the conduit. The enteral feeding pump generally comprises a pumping device operable to act on the feeding set to drive flow of the fluid in the feeding set, and a control system is capable of controlling operation of the pumping device. The enteral feeding pump further comprises a source of infrared radiation operatively connected to the control system of the pump, the control system being configured to intermittently energize the source of infrared radiation to emit infrared radiation in a direction for striking the safety interlock device of the feeding set when mounted on the pump. The propagation of infrared radiation is capable of being affected by the safety interlock device.

The enteral feeding pump further comprises a first detector mounted on the pump in an alcove 4e formed by the pump to shield the first detector from ambient electromagnetic radiation, located relative to the source of infrared radiation so that infrared radiation emitted from the first source will not impinge upon the first detector unless propagation of the infrared radiation emitted from the source is affected by the safety interlock device. The first detector is operatively connected to the control system and arranged for receiving the infrared radiation when its propagation from the source of infrared radiation is affected by the safety interlock device, the first detector providing an indication to the control system that the pump set conduit is properly positioned in the pump. The enteral feeding pump further comprises a source of visible light operatively connected to the control system of the pump, the control system being configured to intermittently energize the source of visible light for emitting visible light in a direction for striking the safety interlock device of the feeding set, the visible light being capable of being filtered out by the safety interlock device. The enteral feeding set further comprises a second, visible light detector mounted on the pump in an alcove formed by the pump to shield the second detector from ambient electromagnetic radiation, the second detector being operatively connected to the control system and arranged for receiving visible light from the source of visible light when the visible light is not filtered out for use in verifying detection of the feeding set by the first detector.
[0009s] In some embodiments, the pump has a key formation permitting the safety interlock device to be mounted on the pump only in a predetermined orientation.
[0009t] In some embodiments, the control system is configured to energize the source of visible light only after the first detector has detected infrared radiation from the source of infrared radiation.
[0009u] In some embodiments, the control system is configured to operate the pumping device for pumping nutritional liquid to the patient when infrared radiation is detected by the first detector and no visible light is detected by the second detector.
[0009v] In yet another aspect of the present invention, there is disclosed an enteral feeding pump for use with a feeding set having a conduit to deliver a supply of liquid nutrient to a patient and a safety interlock device associated with the conduit. The enteral feeding pump generally comprises pumping means operable to act on the feeding set for driving flow of the fluid in the feeding set, control means for controlling operation of the pumping means, and first 4f source means for emitting infrared radiation, the first source means being operatively connected to the control means of the pump. The control means is configured to intermittently energize the first source means to emit infrared radiation in a direction for striking the safety interlock device of the feeding set when mounted on the pump, the propagation of infrared radiation being capable of being affected by the safety interlock device. The enteral feeding pump further comprises first detector means for detecting infrared radiation from the first source means, the first detector means being mounted on the pump in an alcove formed by the pump to shield the first detector means from ambient electromagnetic radiation. The first detector means is located relative to the first source means so that infrared radiation emitted from the first source means will not impinge upon the first detector means unless propagation of the infrared radiation emitted from the first source means is affected by the safety interlock device. The first detector means is operatively connected to the control means and arranged for receiving the infrared radiation when its propagation from the first source means is affected by the safety interlock device. The first detector means provides an indication to the control means that the pump set conduit is properly positioned in the pump. The enteral feeding pump further comprises second source means for emitting visible light, the second source means being operatively connected to the control means of the pump, the control means being configured to energize the second source means for emitting visible light in a direction for striking the safety interlock device of the feeding set. The visible light is capable of being filtered out by the safety interlock device. The enteral feeding pump further comprises second detector means for detecting visible light from the second source means, the second detector means being mounted on the pump in an alcove formed by the pump to shield the second detector means from ambient electromagnetic radiation. The second detector means is operatively connected to the control means and arranged for receiving visible light from the second source means when the visible light is not filtered out for use in verifying detection of the feeding set by the first detector means.
[0009w] In yet another aspect of the present invention, there is disclosed a pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit. The pumping apparatus generally comprises a pumping device operable to act on the pump set to drive flow of the fluid in the 4g pump set, a control system for controlling operation of the pumping device, and a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set. The electromagnetic radiation is of a wavelength selected so that the safety interlock device can affect the propagation of the electromagnetic radiation.
The pumping apparatus further comprises a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving the electromagnetic radiation when its propagation from the source of electromagnetic radiation is affected by the safety interlock device. The first electromagnetic radiation detector provides an indication to the control system that the pump set conduit is properly positioned in the pumping apparatus. The pumping apparatus further comprises a second electromagnetic radiation detector operatively connected to the control system and arranged for receiving electromagnetic radiation when the electromagnetic radiation propagation is not affected by the safety interlock device to be prevented from reaching the second detector for use in verifying detection of the pump set conduit by the first detector.
[0009x] In some embodiments, the source of electromagnetic radiation is adapted to emit electromagnetic radiation generally of a first wavelength, the first detector being configured to detect electromagnetic radiation of a wavelength emitted by the source of electromagnetic radiation and the second detector being configured not to detect electromagnetic radiation of the first wavelength.
[0009y] In some embodiments, the electromagnetic radiation emitted by the source of electromagnetic radiation is infrared.
[0009z] In some embodiments, the second detector is configured to detect electromagnetic radiation in at least one of the visible range and the ultraviolet range.
[0009aa] In some embodiments, the source of electromagnetic radiation constitutes a first source, the apparatus further comprising a second source of electromagnetic radiation of a second wavelength different from the first wavelength, the second detector being configured to detect the electromagnetic radiation of the second wavelength and the first detector being configured not to detect electromagnetic radiation of the second wavelength.
4h [0009ab] In some embodiments, the first and second detectors are arranged on the pumping apparatus so that the safety interlock device properly positioned on the pumping apparatus blocks the second detector from receiving electromagnetic radiation of the second wavelength from the second source and guides electromagnetic radiation of the first wavelength from the first source to the first detector.
[0009ac] In some embodiments, the control system operates at least one of the first and second sources of electromagnetic radiation to emit electromagnetic radiation intermittently.
[0009ad] In some embodiments, the first source of electromagnetic radiation is operated intermittently to generate a pattern of emitter activations in which electromagnetic radiation is emitted from the first source.
[0009ae] In some embodiments, the control system operates the first detector intermittently in a series of detector activations to detect the presence of electromagnetic radiation from the first source.
[0009af] In some embodiments, the number of detector activations is greater than the number of emitter activations.
[0009ag] In some embodiments, the control system has a ratio of detector activations to emitter activations of about 2:1.
[0009ah] In some embodiments, the control system is adapted to operate the first source to emit electromagnetic radiation in a predetermined pattern and to recognize when the predetermined pattern is detected by the first detector.
[0009ai] In some embodiments, the second source of electromagnetic radiation of a second wavelength comprises a blue light.
[0009aj] In some embodiments, the second source emits electromagnetic radiation after the first detector detects electromagnetic radiation of the first wavelength.
[0009ak] In some embodiments, the second detector detects an elevated amount of electromagnetic radiation of the second wavelength and issues a warning.
[0009a1] In yet another aspect of the present invention, there is disclosed a pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit. The pumping apparatus generally comprises a pumping device operable to act on the pump set to drive flow of the fluid in the 4i pump set, a control system for controlling operation of the pumping device, and a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set. The electromagnetic radiation is of a wavelength selected so that the safety interlock device can propagate therethrough the electromagnetic radiation. The pumping apparatus further comprises a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving the electromagnetic radiation when its propagation from the source of electromagnetic radiation is affected by the safety interlock device properly positioned on the pumping apparatus. The pumping apparatus further comprises a second electromagnetic radiation detector operatively connected to the control system and arranged for receiving the electromagnetic radiation from the source of electromagnetic radiation.
[0009am] In some embodiments, the electromagnetic radiation emitted by the source of electromagnetic radiation is infrared.
[0009an] In some embodiments, the electromagnetic radiation emitted by the source of electromagnetic radiation is visible light.
[0009ao] In some embodiments, the control system is programmed to recognize that a pump set is properly loaded on the pumping apparatus when both the first and second detectors detect radiation from the source of electromagnetic radiation.
[0009ap] In some embodiments, the source of electromagnetic radiation and the second detector are arranged so that the second detector also detects radiation from the source when the pump set is not properly loaded on the pumping apparatus.
[0009aq] In some embodiments, the pumping apparatus is combined with the pump set.
[0009ar] In some embodiments, the safety device is adapted to diffuse the light from the source of electromagnetic radiation when properly positioned on the pump set so that the radiation impinges on both the first and second detectors.
[0009as] In some embodiments, the safety device is adapted to diffract the electromagnetic radiation from the source when properly positioned on the pumping apparatus so that the radiation impinges on both the first and second detectors.

4j [0009at] In some embodiments, the safety device has an opening adapted to diffract the radiation from the source and the first and second detectors being spaced apart a distance so that radiation through the opening impinges on both the first and second detectors.
[0009au] In some embodiments, the pumping apparatus further comprises third and other electromagnetic radiation detectors positioned for detecting the electromagnetic radiation when diffracted by the safety device.
[0009av] In some embodiments, the second detector is disposed to receive electromagnetic radiation from the source when the pump set is not properly positioned on the pumping apparatus and not to receive electromagnetic radiation from the source when the pump set is properly positioned on the pumping apparatus.
[0009aw] In some embodiments, the pumping apparatus is combined with the pump set.
[0009ax] In some embodiments, the safety interlock device refracts electromagnetic radiation from the source away from the second detector and toward the first detector when the pump set is properly positioned on the pumping apparatus.
[0009ay] In some embodiments, the first and second detector are spaced apart a distance and the safety interlock device comprises a material having a density that refracts the electromagnetic radiation an amount generally equal to the distance.
[0009az] In some embodiments, the control system is operable to provide activations of the first detector relative to activations of the source of electromagnetic radiation in a ratio of about 2:1.
[0009ba] In still yet another aspect of the present invention, there is disclosed a pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit. The pumping apparatus generally comprises a pumping device operable to act on the pump set to drive flow of the fluid in the pump set, a control system for controlling operation of the pumping device, and a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set. The pumping apparatus further comprises a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving the electromagnetic radiation when its propagation from the source of electromagnetic radiation is 4k affected by the safety interlock device properly positioned on the pumping apparatus. The pumping apparatus further comprises a second electromagnetic radiation detector operatively connected to the control system. The control system is operable to control the source of electromagnetic radiation and the first detector to activate intermittently, and to permit activation of the pumping device only after electromagnetic radiation from the source is detected by the first detector.
[0009bb] In some embodiments, the control system permits activation of the pumping device only if electromagnetic radiation is not detected by the second electromagnetic radiation detector.
[0009bc] In some embodiments, the source of electromagnetic radiation constitutes a first source, the apparatus further comprising a second source of electromagnetic radiation positioned to emit radiation for striking the second detector in the absence of the safety interlock device.
[0009bd] In some embodiments, the control system is operable to activate the second source only after electromagnetic radiation is detected by the first detector.
[0009be] In some embodiments, the control system is operable to activate the first detector more than it activates the source of electromagnetic radiation in a given period.
[0009bf] In another aspect of the present invention, there is disclosed an enteral feeding pump and feeding set for use to deliver a supply of nutrient liquid to a patient, the feeding set generally comprising a conduit for the nutrient liquid and a safety interlock device associated with the conduit. The enteral feeding pump generally comprises a pumping device operable to act on the feeding set to drive flow of the liquid in the feeding set, a control system for controlling operation of the pumping device, and a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation in a direction for striking the safety interlock device of the feeding set.
The electromagnetic radiation is of a wavelength selected so that the safety interlock device can affect the propagation of the electromagnetic radiation. The enteral feeding pump further comprises an electromagnetic radiation detector operatively connected to the control system and arranged for receiving the electromagnetic radiation when its propagation from the source of electromagnetic radiation through the safety interlock device is affected by the safety interlock device, and providing an indication to the control system that the feeding set conduit is properly positioned in the feeding pump.
[0009bg] In some embodiments, the safety interlock device comprises an electromagnetic radiation propagation affecting member received in a recess of the pump when the enteral feeding set is properly loaded, the propagation affecting member comprising a material that diffuses electromagnetic radiation received from the electromagnetic radiation source.

[0009bh] In some embodiments, the source of electromagnetic radiation and the radiation detector are arranged relative to each other so that electromagnetic radiation from the source of electromagnetic radiation will not impinge upon the radiation detector unless the path of the electromagnetic radiation is altered.
[0009bi] In some embodiments, the source of electromagnetic radiation and the radiation detector are arranged relative to each other at an angle other than about 180 degrees.
[0009bj] In some embodiments, the source of electromagnetic radiation and detector are parallel to receive the electromagnetic radiation transmitted from the safety interlock device when the feeding set conduit is properly loaded in the pump.
[0009bk] In some embodiments, the safety interlock device comprises a reflector to reflect the electromagnetic radiation to the detector when the feeding set conduit is properly loaded in the pump.
[0009b1] In some embodiments, the reflector comprises reflective tape affixed to the safety interlock device.
[0009bm] In some embodiments, the reflector comprises polished metal.
[0009bn] In some embodiments, the safety interlock device comprises a light pipe for the passage of the electromagnetic radiation by internal reflection within the light pipe through the safety interlock device.
[0009bo] In some embodiments, an alcove is provided in the feeding pump for mounting the source of electromagnetic radiation and the detector and shielding the detector and source of electromagnetic radiation from ambient light.

4m [0009bp] In some embodiments, the safety interlock device has an opaque covering to prevent ambient light from passing to the detector when the enteral feeding set conduit is properly loaded into the pump.
[0009bq] In some embodiments, the source of electromagnetic radiation comprises an infrared emitter and the detector comprises an infrared detector.
[0009br] In some emMbdiments, a visible light detector is provided, operatively connected to the control system for detecting the presence of visible light.
[0009bs] In another aspect of the present invention, there is disclosed an enteral feeding set for an enteral feeding pump having a control system for controlling operation of the pump to supply nutrient liquid to a patient through the enteral feeding set loaded in the pump, a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation, and an electromagnetic radiation detector operatively connected to the control system for receiving the electromagnetic radiation and providing an indication to the control system that the feeding set is properly loaded in the feeding pump.
The enteral feeding set generally comprises a conduit for carrying nutrient liquid to a patient, a safety interlock device associated with the conduit and adapted for mounting in the pump, the safety interlock device comprising an electromagnetic radiation propagation affecting member formed to affect the propagation of electromagnetic radiation from the source of electromagnetic radiation through the safety interlock device when properly loaded on the pump for directing the electromagnetic radiation from the source of electromagnetic radiation to the detector when the conduit is properly loaded in the pump such that nutrient liquid flow to the patient is regulated by the pump.
[0009bt] In some embodiments, the electromagnetic radiation propagation affecting member comprises a material that diffuses electromagnetic radiation received from the source of electromagnetic radiation.
[0009bu] In some embodiments, the electromagnetic radiation propagation affecting member is adapted to refract the electromagnetic radiation from the source of electromagnetic radiation to the detector.

4n [0009bv] In some embodiments, the electromagnetic radiation propagation affecting member comprises a reflector to reflect the electromagnetic radiation to the detector when the feeding set conduit is properly loaded in the pump.
[0009bw] In some embodiments, the reflector comprises reflective tape affixed to the remainder of the safety interlock device.
[0009bx] In some embodiments, the reflector comprises polished metal.
[0009by] In some embodiments, the electromagnetic radiation propagation affecting member comprises a light pipe for the passage of the electromagnetic radiation through the safety interlock device.
[0009bz] In some embodiments, the electromagnetic radiation propagation affecting member has an opaque covering to prevent visible light from passing through at least a portion of the electromagnetic radiation propagation affecting member.
[0009ca] In some embodiments, the electromagnetic radiation propagation affecting member comprises a material that is opaque to visible light and allows transmission of infrared radiation therethrough.
[0009cb] In some embodiments, the electromagnetic radiation propagation affecting member has at least one hole therein sized and positioned to diffract electromagnetic radiation from the source of electromagnetic radiation.
[0009cc] In another aspect of the present invention, there is disclosed a safety interlock device for an enteral feeding set that may be used with an enteral feeding pump having a control system for controlling operation of the pump to supply fluid to a patient through the enteral feeding set loaded in the pump, a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for detecting electromagnetic radiation generally of a first wavelength and providing an indication that the enteral feeding set is properly loaded on the pump, and a second electromagnetic radiation detector for detecting electromagnetic radiation generally of a second wavelength different from the first wavelength and providing an indication that the enteral feeding set is not properly loaded on the pump, the safety interlock device comprising a radiation propagation affecting member adapted for attachment to the enteral feeding set formed to transmit electromagnetic radiation of the first wavelength therethrough, and formed not to transmit the electromagnetic radiation of the second wavelength wherein upon proper loading of the safety interlock device on the pump the radiation propagation affecting member guides electromagnetic radiation of the first wavelength to the first detector and prevents electromagnetic radiation of the second wavelength from reaching the second detector.
[0009cd] In some embodiments, the radiation propagation affecting member has a first end adapted for fluid connection with a conduit section of the enteral feeding set and a second end adapted for fluid connection with another conduit section of the enteral feeding set.
[0009ce] In another aspect of the present invention, there is disclosed a method of using a feeding set on an enteral feeding pump, the feeding set having an interlock device adapted to be inserted into a recess of the enteral feeding pump, the method comprising:
inserting the interlock device into the recess of the enteral feeding pump; intermittently emitting infrared radiation in a direction for striking the inserted interlock device;
transmitting and internally reflecting the infrared radiation within the interlock device to redirect the infrared radiation toward a first detector when the interlock device is properly inserted in the pump recess;
detecting with the first detector the infrared radiation redirected within the interlock device;
intermittently energizing a visible light emitter only after infrared radiation has been detected by the first detector; filtering visible light with the interlock device to prevent transmission through the interlock device; reading a second detector to verify that visible light emitted by the visible light emitter has been blocked; and enabling operation of the enteral feeding pump to pump nutrient liquid in the feeding set in response to detection of infrared radiation by the first detector and the verification that no visible light is detected by the second detector.
[0009cf] In some embodiments, the step of inserting the interlock device into the recess comprises aligning a key on one of the interlock device and pump with a slot on the other of the interlock device and pump and moving the interlock device onto the pump so that the key is received in the slot.
[0009cg] In some embodiments, the method further comprises attaching a conduit to the interlock device.

4p [0009ch] In some embodiments, the step of attaching a conduit to the interlock device comprises attaching a first end of the interlock device to a first conduit section and attaching a second end of the interlock device to a second conduit section.
[0009ci] In another aspect of the present invention, there is disclosed a method of using a feeding set on an enteral feeding pump, the feeding set having an interlock device adapted to be inserted into a recess of the enteral feeding pump, the method comprising:
inserting the interlock device into the recess of the enteral feeding pump; emitting electromagnetic radiation in a direction for striking the inserted interlock device; detecting at least a portion of the electromagnetic radiation striking the interlock device when the interlock device is properly inserted in the pump recess; and enabling operation of the enteral feeding pump to pump nutrient liquid in the feeding set in response to the detected electromagnetic radiation.
[0009cj] In some embodiments, emitting electromagnetic radiation comprises operating first and second electromagnetic radiation sources and detecting the electromagnetic radiation striking the interlock device comprises distinguishing between electromagnetic radiation emitted by the first source from electromagnetic radiation emitted by the second source.
[0009ck] In some embodiments, enabling operation of the enteral feeding pump comprises enabling the enteral feeding pump to pump nutrient liquid in the feeding set in response to the detected electromagnetic radiation being emitted by the first source and not emitted by the second source.
[0009c1] In some embodiments, the electromagnetic radiation emitted by the first source comprises infrared radiation and the electromagnetic radiation emitted by the second source comprises visible light.
[0009cm] In some embodiments, the electromagnetic radiation emitted by the first source comprises infrared radiation and the electromagnetic radiation emitted by the second source comprises ambient light.
[0009cn] In some embodiments, emitting electromagnetic radiation comprises operating a first electromagnetic radiation source and detecting the electromagnetic radiation striking the interlock device comprises operating a first electromagnetic radiation detector, and further comprising disabling operation of the enteral feeding pump in response to the first detector 3o detecting electromagnetic radiation emitted by a source other than the first source.
4q [0009co] In some embodiments, emitting electromagnetic radiation comprises operating a first electromagnetic radiation source intermittently to generate an alternating pattern of emitter activations and deactivations, the first source emitting electromagnetic radiation during the emitter activations and not emitting electromagnetic radiation during the emitter deactivations.
[0009cp] In some embodiments, the method further comprises detecting electromagnetic radiation striking the interlock device during at least one of the emitter deactivations thereby indicating the interlock device is improperly inserted in the pump recess and disabling operation of the enteral feeding pump in response thereto.
[0009cq] In some embodiments, the method further comprises attaching a conduit to the interlock device.
[0009cr] In some embodiments, the step of attaching a conduit to the interlock device comprises attaching a first end of the interlock device to a first conduit section and attaching a second end of the interlock device to a second conduit section.
[0009cs] In another aspect of the present invention, there is disclosed a method for controlling a pumping apparatus capable of mounting a pump set having a safety interlock device thereon, the method comprising: emitting electromagnetic radiation from a first source of electromagnetic radiation in a direction for striking the safety interlock device of the pump set;
activating a first electromagnetic radiation detector to detect electromagnetic radiation striking the first detector after the electromagnetic radiation has struck the safety interlock device;
emitting electromagnetic radiation from a second source of electromagnetic radiation in a direction for striking the safety interlock device of the pump set; activating a second electromagnetic radiation detector to detect electromagnetic radiation striking the second detector; and controlling the pumping apparatus to operate for pumping fluid in the pump set only when electromagnetic radiation emitted from the first source is detected by the first detector and when the second detector does not detect electromagnetic radiation.
[0009ct] In some embodiments, the method further comprises placing a safety interlock device in a position on the pumping apparatus wherein electromagnetic radiation from the first source strikes the safety interlock device and is directed by the safety interlock device to the first detector.

4r [0009cu] In some embodiments, emitting electromagnetic radiation from the first source comprises emitting infrared radiation and emitting electromagnetic radiation from the second source comprises emitting visible light.
[0009cv] In some embodiments, emitting electromagnetic radiation from the first source comprises operating the first source intermittently to generate a pattern of emitter activations wherein electromagnetic radiation is emitted from the first source.
[0009cw] In some embodiments, activating the first detector comprises operating the first detector intermittently in a series of detector activations to detect the presence of electromagnetic radiation from the first source.
[0009cx] In some embodiments, the number of activations of the radiation detector is greater than the number of activations of the radiation emitter.
[0009cy] In some embodiments, the detector activations and the emitter activations have a ratio of about 2:1.
[0009cz] In some embodiments, the step of emitting electromagnetic radiation from a second source occurs only after the first detector has detected electromagnetic radiation from the first source.
[0010] Various refinements exist of the features noted in relation to the above-mentioned aspects of the present invention. Further features may also be incorporated in the above-mentioned aspects of the present invention as well. These refinements and additional features may exist individually or in any combination. For instance, various features discussed below in relation to any of the illustrated embodiments of the present invention may be incorporated into any of the above-described aspects of the present invention, alone or in any combination.

4s BRIEF DESCRIPTION OF THE DRAWINGS
[0011] FIG. 1 is a perspective of an enteral feeding pump showing a fragmentary portion of a feeding set received on the pump;
[0012] FIG. 2 is a perspective of the pump;
[0013] FIG. 3 is an elevation of the administration feeding set;
[0014] FIG. 4 is a block diagram showing the elements of the pump'
[0015] FIG. 5 is an enlarged, fragmentary section of the pump and a safety interlock device of a first embodiment;
[0016] FIG. 6 is a top plan view of Fig. 5;
[0017] FIG 6A is a schematic diagram similar to Fig. 6 showing propagation of a light ray in the safety interlock device;
[0018] FIG. 7 is an enlarged, fragmentary section of a pump and safety interlock device of a second embodiment;
[0019] FIG. 7A is an enlarged, fragmentary section of a pump and a safety interlock device of a third embodiment;
[0020] FIG. 8 is an enlarged, fragmentary section of a pump and a safety interlock device of a fourth embodiment;
[0021] FIG. 9 is an enlarged, fragmentary section of a pump and a safety interlock device of a fifth embodiment;
[0022] FIG. 10 is an enlarged, fragmentary section of a pump and a safety interlock device of a sixth embodiment;
[0023] FIG. 11 is a state diagram of a microprocessor of the pump;
[0024] FIG. 12 is a an enlarged, fragmentary section of a pump and a safety interlock device of a seventh embodiment;
[0025] FIG. 13 is an enlarged, fragmentary section of a pump and a safety interlock device of an eighth embodiment;
[0026] Fig. 14 is a top plan view of a pump and a safety interlock device of a ninth embodiment;
[0027] FIG. 15 is a state diagram of a microprocessor of the pump of the ninth embodiment;
[0028] FIG. 16 is a block diagram showing a feeding set and elements of the pump of the ninth embodiment;
[0029] FIG. 17 is a flow chart showing operation of a software subsystem used with the pump of the ninth embodiment that pulses an infrared emitter;
[0030] FIG. 18 is a flow chart showing operation of another software subsystem that can be used with the pump of the ninth embodiment that does not pulse the infrared emitter;
[0031] FIG. 19 is a state diagram showing conditions encountered in executing the instructions of the software subsystem shown in Fig. 18;
[0032] FIG. 20 is a fragmentary top plan view of a pump and safety interlock device of a tenth embodiment;
[0033] FIG. 21 is an enlarged fragmentary section taken along line 21-21 of Fig. 20; and
[0034] FIG. 22 is an enlarged, fragmentary section similar to Fig. 21 but showing a safety interlock device of an eleventh embodiment.
[0035] Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.

DETAILED DESCRIPTION
[0036] Referring now to the drawings, an enteral feeding pump (broadly, "a pumping apparatus") constructed according to the principles of the present invention is generally indicated at 1. The feeding pump comprises a housing generally indicated at 3 that is constructed so as to mount an administration feeding set (broadly, a "pump set") generally indicated at 5 (see Figs. 1 and 3). It will be appreciated that "housing" as used herein may include many forms of supporting structures (not shown), including without limitation multi-part structures and structures that do not enclose or house the working components of the pump 1. The pump 1 also has a display screen 9 on the front of the housing 3 that is capable of displaying information about the status and/or operation of the pump. Buttons 11 on the side of the display screen 9 are provided for use in controlling and obtaining information from the pump 1. It will be understood that although the illustrated pump 1 is an enteral feeding pump, the present invention has application to other types of peristaltic pumps (not shown), including medical infusion pumps. A pump of the same general type as described herein is shown in co-assigned U.S. Patent No. 4,909,797 entitled ENTERAL DELIVERY SET WITH SHADED
DRIP CHAMBER.
[00371 The enteral feeding pump 1 further includes a pumping unit (indicated generally at 23) comprising a pump motor 25 located in the housing 3 and shown schematically in Fig. 4. An electrical cord 27 extends from the housing 3 for connection to a source of electrical power for the motor 25. Alternatively, or in addition, a battery (not shown) may be received in the housing 3 for powering the pump motor 25. The pumping unit 23 further includes a rotor (generally indicated at 37) mounted on a rotor shaft (not shown) of the pumping unit. The rotor 37 includes an inner disk 39, an outer disk 41 and three rollers 43 (only one is shown) mounted between the inner and outer disks for rotation about their longitudinal axes relative to the disks. In the illustrated embodiment, the pump motor 25, rotor shaft and rotor 37 may broadly be considered "a pumping device". The pump housing 3 includes a first lower recess 45 above the rotor 37 and a second lower recess 47 generally adjacent the first lower recess. The housing 3 has an upper recess 49 generally axially aligned with the first lower recess 45 and a shoulder 51 at the bottom of the upper recess for receiving and holding part of the feeding set 5. A curved recess 53 in 6a the housing 3 above the second lower recess 47 receives and holds another part of the administration feeding set 5 in place. The lower recesses 45, 47, upper recess 49 and curved recess 51 may broadly be considered, individually or as a group, "a receiving portion" of the housing 3 that receives parts of the administration feeding set 5 in a manner that will be described in more detail hereinafter.
[0038] Referring now to Fig. 3, the administration feeding set 5 comprises tubing (broadly, "a conduit") indicated generally at 55 that provides a fluid pathway between at least one source of fluid and a patient. Tubing 55 can be made of a medical grade, deformable silicone and comprises first tube section 57 connected between a drip chamber 59 and a safety interlock device, generally indicated at 61. A second tube section 63 is connected to the safety interlock device 61 and at an outlet of the tubing 55 to a connector, such as a barbed connector 65, suitable for connection to a gastrostomy device (not shown) attached to a patient. Third tube section 67 is connected at an inlet of the tubing 55 to a bag 69 of nutrient liquid and to the drip chamber 59. As previously stated, pump sets of different constructions may be used, for example a recertification set (not shown) may be used to verify and/or correct the pump accuracy. The pump 1 can be configured to automatically recognize what kind of set is installed and to alter its operation to conform to that called for by the particular pump set. Still further, the pump 1 can be configured to detect with sensors whether the first tube section 57 is properly installed on the pump.
[0039] As shown in Fig. 3, the safety interlock device 61 connects first tube section 57 and the second tube section 63 of the administration feeding set 5.
The safety interlock device 61 has a central axial bore 81 to allow the flow of fluid between the first tube section 57 and the second tube section 63 (see, Fig. 5). The safety interlock device 61 has an upper cylindrical portion 83 that receives a portion of the tube 57, an electromagnetic radiation propagation affecting member 87 that extends radially outward from the upper cylindrical portion, and a lower cylindrical portion 89 that is received in the second tube section 63 for attaching the second tube section to the safety interlock device.
It is to be understood that the safety interlock device 61, and in particular the member 87 may be separate from the administration feeding set 5, and/or may be attached to the administration feeding set in such a way that liquid does not pass through the safety interlock device. The electromagnetic radiation propagation affecting member 87 is sized to be received on a seat, indicated generally at 91, formed at the bottom of the second lower recess 47 in the pump 1 when the administration feeding set 5 is properly loaded on the pump. In the illustrated embodiment, the seat 91 is generally semi-cylindrical to correspond with the shape of the safety interlock device 61 and includes an axially facing surface 95 in the second lower recess 47 and a radially facing surface 99 in the second lower recess 47. In this first and most other embodiments, proper functioning of the pump 1 is generally achieved when the radiation propagation affecting member 87 is seated in substantially face-to-face relation with the axially facing surface 95 of the seat 91.
However, the rotation orientation of the member 87, within the seat 91, about its axis is generally not pertinent to operation. In a few embodiments (noted hereinafter) a particular rotational orientation of the member 87 is useful, in which cases keying structures are provided. Other ways of positioning the propagation affecting member 87 may be used within the scope of the present invention. The safety interlock device 61 and the seat 91 in the housing 3 may be shaped to prevent the administration feeding set 5 from being accidentally dislodged and to prevent the use of non-compliant feeding sets that do not have the safety interlock device. In the illustrated embodiment, the safety interlock device 61 and seat 91 are generally cylindrical in shape but it is understood that other shapes (e.g., hex-shaped) may be used for the safety interlock device and the seat. As will be discussed in more detail below, the safety interlock device 61 is comprised of a material (e.g., a thermoplastic polymer resin such as polysulfone thermoplastic resin or other suitable materials) that is opaque to visible light but easily transmits electromagnetic radiation in the infrared range.
[00401 Generally speaking, a safety interlock device is able to affect the propagation of electromagnetic radiation by diffusion, diffraction, reflection and/or refraction, or any combination of diffusion, diffraction, reflection and/or refraction.
Diffusion is generally understood as the scattering of electromagnetic radiation rays either when reflected from a rough surface or during transmission of electromagnetic radiation through a translucent medium. Diffraction is generally understood as the bending of electromagnetic radiation rays around the edges of opaque objects. Reflection is understood as the return or change in the direction of travel of particles or radiant energy which impinges on a surface but does not enter the substance providing the reflecting surface. Refraction is understood as the change in direction of motion of a ray of radiant energy as it passes obliquely from one medium into another in which the speeds of propagation are different (e.g., media of different densities). The amount of refraction is based on the index of refraction dependent in part on the density of the material facing the medium.

[00411 The pump 1 can be programmed or otherwise controlled for operation in a desired manner. For instance, the pump 1 can begin operation to provide feeding fluids from bag 69 to the patient. The care giver may select, for example, the amount of fluid to be delivered, the rate at which the fluid is to be delivered and the frequency of fluid delivery. As shown in Fig. 4, the pump 1 has a controller 77 (broadly, "a control system") including a microprocessor 79 that allows it to accept programming and/or to include pre-programmed operational routines that can be initiated by the care giver. The microprocessor 79 controls pump electronics 80 that operate the motor 25. A
software subsystem 82 is used to determine if the feeding set 5 has been positioned properly on the pump 1.

[00421 In the first embodiment, the pump includes an infrared ("IR") emitter (broadly, "a source of electromagnetic radiation") housed in the second lower recess 47.
Referring to Figs. 5 and 6, the IR emitter 105 is operatively connected to the controller 77 for emitting an electromagnetic signal having a ("first") wavelength in the infrared range in a direction for striking the safety interlock device 61 of the feeding set 5.
In the illustrated embodiment, the source of electromagnetic radiation is an infrared (IR) emitter 105 but it is understood that other types of sources of electromagnetic radiation may be used without departing from the scope of this invention. An infrared ("IR") detector 109 located in the second lower recess 47 is operatively connected to the controller 77 for receiving the infrared signal from the IR emitter 105 and providing an indication to the controller that the feeding set 5 is properly positioned in the pump 1. In the illustrated embodiment, the IR detector 109 (broadly, "a first sensor") detects infrared radiation but it is understood that electromagnetic radiation sensors that detect other types of electromagnetic radiation maybe used without departing from the scope of this invention. The IR detector distinguishes infrared radiation from other types of electromagnetic radiation (e.g., visible or ultraviolet light). A visible light detector 111 (broadly, "a second electromagnetic radiation detector" and "a second sensor") is housed in the second lower recess 47 generally adjacent the IR detector 109. The visible light detector 111 provides a signal to the controller 77 when visible light from the surrounding environment (e.g., electromagnetic radiation of a second wavelength) is detected to indicate that the safety interlock device 61 is not mounted in the second lower recess 47 in a position that blocks visible light from reaching the detector. Preferably, the visible light detector 111 is configured to detect electromagnetic radiation in the visible range, but not to detect electromagnetic radiation outside the visible range (e.g., infrared radiation). A second electromagnetic radiation detector could be configured to detect electromagnetic radiation in other ranges, such as in the ultraviolet range. Thus, the visible light detector 111 can distinguish visible light from infrared radiation. As used herein, electromagnetic radiation of a "first" or "second" wavelength is intended in each case to encompass a range of wavelengths, such as wavelengths falling in the infrared range, visible range and/or ultraviolet range.
[00431 Other sensors (not shown), such as a sensor that determines the type of pump set that has been placed in the pump 1 and a flow monitoring sensor can be in communication with the controller 77 to facilitate accurate operation of the pump. The IR
emitter 105 is positioned in an alcove 113 in the second lower recess 47 of the housing 3 so that electromagnetic radiation (indicated by arrows Al in Fig. 6) from the emitter is directed to the electromagnetic radiation propagation affecting member 87 of the safety interlock device 61 (see also, Fig. 5). When the safety interlock device 61 is properly located on the seat 91, the infrared radiation from the IR emitter 105 is diffused through the electromagnetic radiation propagation affecting member 87 and internally reflected so that the infrared radiation is directed to and detected by the IR detector 109. Diffusion may be enhanced by the addition of particulates to the material of the member 87. In this first embodiment (and other embodiments) the infrared radiation propagation is affected primarily through internal reflection. Other effects on infrared radiation propagation, such as diffusion, may also assist. However, any infrared radiation that is refracted is minimal and does not contribute to the infrared radiation signal seen by the IR
detector 109 (i.e., refraction causes a reduction in signal strength). The IR detector is positioned in an alcove 117 in the radially facing surface 99 of the seat 91 and the visible light detector 111 is positioned in an alcove 119. The alcoves 113, 117, 119 recess the IR emitter 105 and the IR and visible light detectors 109, 111 to protect them from physical contact with the propagation affecting member 87. Although not shown, a clear plastic window may enclose each of the emitter 105 and the detectors 109, 111 within their corresponding alcoves 113, 117, 119 for additional protection. Moreover, the alcoves 117 and 119 help to shield the detectors 109 and 111 from ambient electromagnetic radiation (which may include both visible light and infrared radiation).
[00441 In the illustrated first embodiment, the IR emitter 105 is located approximately 90 degrees from the IR detector 109. When the feeding set 5 is not loaded in the second lower recess 47 and the electromagnetic radiation propagation affecting member 87 is not received on the seat 91, the infrared radiation from the IR
emitter 105 is not detected by the IR detector 109. Also when the safety interlock device 61 is not received on the seat 91, visible light from outside of the pump 1 (i.e., ambient light) may enter the second lower recess 47 and is detected by the visible light detector 111. The propagation affecting member 87 is preferably constructed of a material that transmits infrared radiation, but is opaque to visible light. The propagation affecting member 87 may be monolithic or may have other constructions such as an outer layer (not shown) that transmits infrared radiation, but does not transmit visible light and an inner layer or core that is transmissive to both infrared radiation and visible electromagnetic radiation.

[00451 Referring now to Fig. 6A, movement of infrared radiation within the electromagnetic radiation propagation affecting member 87 is schematically illustrated.
The IR emitter 105 emits infrared radiation in a cone toward the side of the member 87.
The IR emitter 105 is arranged generally perpendicular to the immediately adjacent side of the member 87. The centerline CL of the cone is denoted in the drawing. For simplicity, we will ignore diffusion and look at a ray RI of radiation that is a bisector of approximately one half of the cone. The ray RI is representative of the nominal path of infrared radiation in this half of the cone. The other half of the cone (i.e., that portion above the centerline CL in Fig. 6A) is believed to be of small or no use in providing a light signal capable of being detected by the IR detector 109. The ray RI strikes the side of the propagation affecting member 87 at an angle so that it enters the member rather than being reflected back. The ray R1 travels generally toward the center of the member 87 until it reaches a boundary B (broadly, "an inner boundary region") around the axial bore 81 of the member. The ray RI is reflected back toward the side of the member 87 where a good percentage of the ray is reflected back toward the center. At the boundary B, the ray RI is once more reflected back toward the side of the member 87. Finally, the ray strikes the interior side of the member 87 at a location that is about 96 degrees away from the location of the IR emitter 105. It has been found that a particularly high level of intensity of infrared radiation escapes the member 87 at this location. Accordingly, the IR
detector 109 is preferably positioned here, or in a range of around 75-105 degrees.
Another higher intensity node is found at a location around 49 degrees from the IR emitter 105, as would be expected from the reflection.
[00461 The boundary B of the electromagnetic radiation propagation affecting member 87 can be made of the same material as the remainder of the member. The material at the boundary B may be more "polished" (i.e., more specular) than elsewhere to increase its ability to reflect electromagnetic radiation impinging upon the boundary.
However, it is also possible that the central part of the member 87 could be formed of a separate material. In that case, the member 87 would be formed of an inner and an outer member, such as described below in regard to Fig. 22. In use, the administration feeding set feeding fluid bag 69 can be hung from a suitable support, such as an IV
pole (not shown). The drip chamber 59 can be placed in the first lower recess 45 and upper recess 49 in an operating position as shown in Fig. 1. The first tube section 57 is placed around the lower part of the rotor 37 and the safety interlock device 61 is placed on the seat 91 at the bottom of the second lower recess 47. The seat 91 in the second lower recess 47 is generally located so that the safety interlock device 61 can be placed into the second lower recess at a location in which the first tube section 57 is substantially stretched around the rotor 37. The IR emitter 105 and IR detector 109 may intermittently or continuously check for the presence of the properly loaded feeding set 5. When the safety interlock device 61 is received in a proper operating position on the seat 91, the infrared signal from the IR
emitter 105 is directed to the electromagnetic radiation propagation affecting member 87.
The electromagnetic radiation propagation affecting member admits the infrared radiation into its interior where the electromagnetic radiation is diffused and internally reflected (see Figs. 6 and 6A). Some of the infrared radiation which is redirected outward and impinges the outer boundary of the electromagnetic radiation propagation affecting member 87 substantially at right angles thereto passes out of the electromagnetic radiation propagation affecting member. Some of the escaping infrared radiation is directed toward the IR
detector 109. The IR detector is periodically operated and detects the presence of infrared radiation when the feeding set 5 has been properly loaded on the pump. It is understood that the IR detector 109 is preferably unable to detect electromagnetic radiation having a wavelength in the visible light region of the electromagnetic spectrum. Upon detection of the infrared signal, the IR detector 109 sends a corresponding signal to the microprocessor 79. Also, when the safety interlock device 61 is loaded onto the seat 91, visible light is blocked by the member 87 from reaching the visible light detector 111. When the set 5 is loaded, the visible light detector 111 sends a signal to the microprocessor 79 to indicate that visible light is blocked and the pump 1 may be operated.
[00471 In one embodiment, the IR emitter 105 and IR detector 109 are both operated intermittently to detect the presence of the safety interlock device 61 on the seat 91. The IR emitter 105 is operated to generate a pattern of infrared radiation pulses. The IR detector 109 is operated in a series of detector activations or pulses that check for the presence of electromagnetic radiation from the IR emitter 105. Typically, the number of activations from the IR detector 109 will be greater than the number of pulses from the IR
emitter 105 for a given period of time. For example, the IR detector 109 may have two activations in a three second time period and the IR emitter 105 may be programmed to generate one pulse of infrared radiation during the three second time period.
During the three second time period, the pump 1 has a ratio of detector activations to emitter activations of about 2:1. It is understood that the pump 1 may have other ratios and that the IR emitter 105 and IR detector 109 may operate in other predetermined intermittent patterns without departing from the scope of this invention. The IR detector 109 and the controller 77 may be configured for recognizing a particular, and for example irregular, pattern of activations of the IR emitter 105.
[00481 Figure 7 shows a seat 191 and a safety interlock device 121 of a second embodiment of the present invention. The safety interlock device 121 of this embodiment has an electromagnetic radiation propagation affecting member 123 with an angled annular surface 125. The IR emitter 129 is located in an alcove 131 in a radially facing surface 132 of a seat 191 of housing 143 and is positioned to direct infrared radiation toward the safety interlock device 121 in a similar manner as the first embodiment. In the embodiment of Fig. 7, the IR detector 133 and visible light detector 135 are located in respective alcoves 137, 139 in an axially facing surface 141 of the seat 191.
The angled annular surface 125 is reflective so that it reflects infrared radiation from the IR emitter 129 downward to the IR detector 133 when the safety interlock device 121 is received on the seat 191 of the housing 143. When the safety interlock device 121 is not properly received in the seat 191, visible ambient light can be detected by the visible light detector 135.
[00491 Figure 7A shows a seat 159 and a safety interlock device 161 of a third embodiment of the present invention. In this embodiment, the safety interlock device 161 includes a reflector 165 on the external radial surface of an electromagnetic radiation propagation affecting member 167. The reflector 165 may be a layer of reflective tape or a layer of polished metal affixed to the remainder of the electromagnetic radiation propagation affecting member 167. In the embodiment of Fig. 7A, the IR emitter 169, the IR detector 171, and the visible light detector 173 are arranged in an alcove 175 in a radially facing surface 177 of housing 179 in a manner such that the three devices are generally vertically aligned and parallel to each other. It is understood the IR emitter 169, IR detector 171, and visible light detector 173 may be otherwise arranged.
When the safety interlock device 161 is received in the seat 159, the infrared radiation emitted from the IR emitter 169 is reflected off the reflector 165 and transmitted to the IR detector 171 and ambient visible light is blocked from detection by the visible light detector 173. When the safety interlock device 161 is not loaded in the seat 159, infrared radiation is not transmitted to the IR detector 171 and ambient visible light can be detected by the visible light detector 173.
[00501 Figure 8 shows a seat 189 and safety interlock device 191 of a fourth embodiment of the present invention. As in the prior embodiments, the safety interlock device 191 can be removably positioned on the seat 191 and thereby releasably attached to the pump by the user or caregiver. In this embodiment, the safety interlock device 191 includes a light pipe 195 ("an electromagnetic radiation propagation affecting member") received in the seat 189 of the housing 199 when the feeding set 201 is loaded on the pump. The light pipe 195 includes an outer annular portion 205, an angled annular wall 207, and a central portion 209 between the angled wall and the upper portion 211 that receives a tube 213 of the feeding set 201. As shown in Fig. 8, the IR emitter 217 and IR
detector 219 are both housed below a bottom wall 221 of the seat 189. The IR
emitter 217 directs infrared radiation upward to the outer annular portion 205 of the light pipe 195 that is reflected by the angled annular wall 207 through the central portion 209 of the light pipe (around a central fluid passage 218) before being reflected to the IR detector 219 by the angled annular wall 207 on the opposite side of the light pipe. When the safety interlock device 191 is not properly seated on the seat 189 in the loaded position of the feeding set 201, the IR signal from the IR emitter 217 is not transmitted through the light pipe 195 to the IR detector 219. A visible light detector (not shown) may be present for use in detecting ambient light as in earlier embodiments of the invention.
[0051] Figure 9 shows a seat 231 and a safety interlock device 235 of a fifth embodiment of the present invention. This safety interlock device 235 of this embodiment comprises an infrared radiation transmissive material that also refracts the infrared radiation transmitted through the safety interlock device. The safety interlock device 235 has a generally polygonal shape. Opposite sides 236 of the safety interlock device 235 are angled parallel to each other. The seat 231 is keyed to receive the safety interlock device in the particular orientation illustrated in Fig. 9 so that electromagnetic radiation is refracted in the desired manner, as will be described. An IR emitter 237, an upper IR
detector 239 (broadly, "a second detector"), and a lower IR detector 241 (broadly, "a first detector") are positioned for sensing if an administration feeding set 245 has been properly loaded into the pump. The upper and lower IR detectors 239, 241 are positioned on the opposite side of the seat 231 from the IR emitter 237 such that the emitter and the detectors are oriented at approximately 180 degrees with respect to each other. Also, the upper IR detector 239 and lower IR detector 241 are spaced apart a distance D
so that when infrared radiation is passed through the safety interlock device 235, the radiation (as indicated at arrow A5) is refracted or bent downward so that the lower IR
detector 241 senses the presence of infrared radiation and sends a signal to the microprocessor to enable operation of the pump. The sides of the safety interlock device 25 are angled parallel to each other so that refraction of the infrared radiation is directed by the refraction to the lower IR detector 241. When the safety interlock device 235 is not loaded in the seat 231 of the pump, the infrared radiation from the IR emitter 237 (as indicated by phantom arrow A6) passes through the seat such that the beam of infrared radiation is directed to only the upper IR detector 239, which sends a signal to the controller to disable operation of the pump. The density and width of the safety interlock device 235 affects the distance D
between the upper detector 239 and the lower detector 241 so that if an feeding set is used having a safety interlock device made of a material having a different density and/or width, the electromagnetic radiation will not be refracted the proper distance to impinge on the lower IR detector 241 even if the feeding set is properly loaded. A visible light detector (not shown) may be present for use in detecting ambient light as in earlier embodiments of the invention.
[0052] Figure 10 shows a seat 271 and safety interlock device 273 of a sixth embodiment of the present invention. The safety interlock device 273 of this embodiment is generally similar to the first embodiment but includes a layer 275 of infrared radiation blocking material on the external surface of the safety interlock device. As in the first embodiment, the safety interlock device 273 includes an electromagnetic radiation propagation affecting member 279 that transmits infrared radiation through the safety interlock device. The external radial surface 281 of the electromagnetic radiation propagation affecting member 279 is free from infrared radiation blocking material as this surface is used to receive the infrared signal from the IR emitter 285 so that the IR signal is transmitted through the safety interlock device 273 for detection by the IR
detector 287. It is understood that the IR emitter 285 and IR detector 287 of this embodiment may be positioned at any angle around the radial surface 291 of the seat 271. The IR
blocking layer 275 prevents infrared electromagnetic radiation from outside sources (e.g., sunlight) from reaching the IR detector 287 when the administration feeding set 295 is loaded on the pump. It is envisioned that portions of the radial surface 281 of the electromagnetic radiation propagation affecting member 279 may have IR blocking material thereon. In that event, the electromagnetic radiation propagation affecting member 279 is preferably keyed with structure (not shown) on the seat 271 so that the IR emitter 285 and IR detector 287 are unblocked. A visible light detector (not shown) may be present for use in detecting ambient light as in earlier embodiments of the invention.
[0053] The safety interlock device 273 of this embodiment may be constructed by a "co-injection molding" process also referred to as a "two-shot injection molding"
process. The process includes injection molding the safety interlock device 273 with the electromagnetic radiation propagation affecting member 279 comprising an infrared radiation transmissive material (e.g., light transmissive thermoplastic polymer resin) together with the IR blocking layer 275 (e.g., an opaque thermoplastic polymer resin).
Other variations of this embodiment may include the use of a visible light blocking material (e.g., thermoplastic polymer resin mixed with red dye) instead of an IR blocking material to allow infrared electromagnetic radiation to pass through the safety interlock device but prevent visible light from passing through the device.

[0054] Figure 11 is a state diagram illustrating the various conditions the controller 77 (Fig. 4) may encounter when operating the software subsystem 82 to determine if the safety interlock device 61 is properly loaded on the pump. The state diagram has application to other embodiments, but will be described in respect to the first embodiment.
As shown in Fig. 11, for the controller to provide a "SET LOADED" status, the status of the IR emitter 105 and IR detector 109 must be "ON" and the status of the visible light detector 111 must be "OFF". Any other combination of status indications from the IR
emitter 105, 1R detector 109 and visible light detector 111 results in a "FAULT" status being indicated by the controller. The "FAULT" status will prompt the user to check the loading of the safety interlock device 61 and will prevent the pump 1 from operating.
Once the feeding set 5 is properly loaded, the controller 77 will sense a "SET
LOADED"
condition and initiate operation of the pump 1. During operation of the pump, the IR
emitter 105 may operate continuously so that the safety interlock status is continuously monitored and if the status changes from "SET LOADED" to "FAULT", the controller 77 will stop operating the pump 1 and enter an alarm condition. Optionally, the IR emitter 105 may be operated intermittently with brief pulses of infrared electromagnetic radiation being transmitted at a set time interval to the 1R detector 109 so that the safety interlock status is continuously monitored. The visible light detector 111 may continuously check for the presence of visible light so that if the safety interlock 61 is removed from the seat 91 and allows visible light into the recess, the visible light detector 111 immediately senses this condition and signals the controller 77 to enter an alarm condition. The visible light detector 111 may operate intermittently without departing from the scope of this invention.
[00551 Figure 12 shows a seat 301 and safety interlock device 303 of a seventh embodiment of the present invention. In this embodiment, the safety interlock device 303 is made of an infrared radiation opaque material and has an opening 307 passing from the top surface 309 to the bottom surface 311 of the device. The opening 307 is configured to break the beam of infrared radiation (indicated at A7) from the IR emitter 313 via diffraction into a series of spaced apart beams (indicated at A8a thru A8e) that are detected by a series of IR detectors 321a through 321e located below the seat 301 in the housing 327. In the illustrated embodiment the IR emitter 313 is located in an alcove 331 above the safety interlock device 303 and the IR detectors (321 a - 321 e) are located in an alcove 335 below the safety interlock device 303. The IR detectors 321a through 32l e are spaced apart a distance such that the infrared radiation that is diffracted by the opening 307 impinges on the IR detectors. It is understood that the IR emitter 313 could be below the safety interlock device 303 and that the IR detectors 321 a-321e could be above the safety interlock device or in some other arrangement without departing from the scope of this invention. A visible light emitter and array of visible light detectors (not shown) could be used in place of the IR emitter 313 and IR detectors 321a-321e.
[0056] In the embodiment of Fig. 12, the infrared radiation from the IR
emitter 313 diffracted by the safety interlock device 303 so that the infrared radiation from the IR
emitter is detected by the IR detectors 321 a thru 321 e when the interlock device 303 is properly located on the seat 301. The number of detectors 321a-321e maybe other than shown in this embodiment without departing from the scope of the present invention.
When the interlock device 303 is not present, infrared radiation from the IR
emitter 313 is seen by the middle IR detector 321c (broadly, a second detector), but not by the other detectors 321a, 321b, 321d, 321e. The interlock device 303 is preferably keyed (not shown) to the housing 327 to assure proper positioning. A visible light detector (not shown) may also be used to detect ambient visible light as in earlier embodiments of the invention.
[0057] Figure 13 shows a seat 381 and a safety interlock device 385 of an eighth embodiment of the present invention. In this embodiment, the safety interlock device 385 has an electromagnetic radiation propagation affecting member 387 made of a material capable of transmitting infrared radiation. The electromagnetic radiation propagation affecting member 387 has a layer of material 389 on the top surface of the member that is opaque to the transmission of IR. The opaque layer 389 has an opening 391 that breaks the single infrared radiation beam A9 from the IR emitter 393 via diffraction into a series of spaced apart beams Al Oa through AIOe that are detected by respective IR
detectors 395a through 395e when the safety interlock device 385 is properly seated in the pump.
When the propagation affecting member 387 is removed from the seat 381, only the IR
detector 395c sees the infrared radiation from the IR emitter 393. It will be understood that the number of IR detectors 395a-395e may be other than shown. It is further understood an IR detector other than IR detector 395c can see infrared radiation or more than one IR detector can see the infrared radiation when the propagation affecting member 387 is removed from the seat 381. One can also switch the orientation of the group of IR
detectors 395a-395e to be in the lower portion of seat 381 and the IR emitter or IR emitters in the upper portion of the seat. A visible light emitter and visible light detectors (not shown) could be used in place of the IR emitter 393 and IR detectors 395a-395e. In that event, the electromagnetic radiation propagation member would be capable of transmitting visible light, but have a layer (like layer 389) that is opaque to visible light. Moreover, another visible light detector could be used in this eighth embodiment as in prior embodiments. The interlock device 385 is preferably keyed (not shown) to assure proper positioning.
[0058] Figure 14 shows a seat 421 and a safety interlock device 461 of a ninth embodiment of the present invention. The seat 421 is part of a pump 401 that is illustrated in block diagram form in Fig. 16. The pump 401 mounts a feeding set 405 including tubing 455 and a safety interlock device 461. The feeding set 405 may be substantially the same as the feeding set 5 shown in Fig. 3. A pumping device 423 includes a rotor 437 driven by a motor 425. The rotor 437 can engage the tubing 455 to pump fluid to a patient, substantially as described in previous embodiments. This embodiment includes an IR emitter 427, an IR detector 429, a visible light emitter 433, and a visible light detector 435 in respective alcoves in the housing 439 (Fig. 14). In this embodiment, the IR emitter 427 and the IR detector 429 are arranged at an approximately 90 degree angle with respect to each other and the visible light emitter 433 and the visible light detector 435 are arranged at an approximately 90 degree angle with respect to each other. Other relative angles are also possible. Generally speaking, the IR detector 429 is located relative to the IR emitter 427 so that in the absence of the safety interlock device 461, the infrared radiation emitted by the IR emitter will not impinge upon the IR detector.
Both the IR
emitter 427 and visible light emitter 433 are arranged generally perpendicular to the immediately adjacent side of the safety interlock device 461 when properly mounted on the pump 401. Moreover in this and other embodiments, the gap between the emitters 427, 433 and the safety interlock device 461 is preferably small in relation to the diameter of the safety interlock device (e.g., nominally 0.005 inches or about 0.13 mm). The safety interlock device 461 of this embodiment is transmissive to infrared radiation but is opaque to visible light. In other words, the interlock device 461 filters out visible light but passes infrared radiation.

[00591 The infrared signal emitted by the IR emitter 427 is diffused and reflected in the safety interlock device 461 such that the signal strikes the IR
detector 429 when the feeding set 405 is properly loaded. The seat 421 and safety interlock device 461 of this embodiment are especially useful in operating in a dark room since the visible light emitter 433 provides a second electromagnetic radiation signal (e.g., a blue light) that substitutes for visible light not present in a dark room. The control system of this embodiment first pulses the IR emitter 427 until the IR detector 429 receives a signal recognizing that the safety interlock device 461 is loaded. Next, the visible light emitter 433 is activated to send a light signal that is blocked by the safety interlock device 461 if the safety interlock device is correctly located in the seat 421. The visible light detector 435 is operated to check for the visible light signal and to detect excess ambient light. If either condition is detected (i.e., light from emitter 433 or excess ambient light), a controller 477 activates an alarm that warns the operator to check the alignment of the feeding set 405 and does not allow the pump 401 to operate until the condition is corrected. The blockage of ambient light by the safety interlock device 461 causes the controller 477 to recognize that the set is loaded and the pump may be operated. The pump 401 detects a fault condition if the visible light detector 435 detects the visible light signal from the visible light emitter 433 after the IR detector 429 detects the presence of the safety interlock device 461.
[00601 Referring to Fig. 16, the controller 477 has a microprocessor 479 that controls pump electronics 480 that operate the motor 425. The controller 477 includes at least one software subsystem 482 used in detecting the proper positioning of the feeding set 405 on the pump 401. Operation of the software subsystem 482 for use in controlling the pump 401 based on whether the feeding set 405, and in particular the safety interlock device 461, is properly positioned on the pump, is given in a flowchart illustrated in Fig.
17. This particular set of instructions operates so that the IR emitter 427 is turned on and off or "pulsed". When the pump 401 is powered up at 1396, the software initializes at block 1398 by setting several items to OFF. For example, the IR emitter 427 and visible light emitter 433 are set to OFF. Similarly, a program feature called Ambient Lock is set to OFF, as are program features InstantOutput and Output. Briefly, Ambient Lock is a feature that is triggered to prevent operation of the pump 401 when it is determined that the IR detector 429 sees infrared radiation from a source other than the IR
emitter 427.
The InstantOutput is a temporary or preliminary output of the software (i.e., whether the pump 401 is to be allowed to begin pumping). Output is the final output of the software used for determine whether the pump 401 is permitted to operate for pumping fluid.
[00611 At the outset as shown in Fig. 17, the function of the software subsystem 482 will be described assuming that the safety interlock device 461 has been properly positioned on the pump 401. After the initialization 1398, the IR emitter 427 is switched (or "toggled") ON at block 1400 so that infrared radiation is emitted. If the safety interlock device 461 is positioned so that the infrared radiation strikes the safety interlock device, the propagation of the infrared radiation from the emitter 427 will be affected so that infrared radiation is diffused and reflected within the safety interlock device. Some of the infrared radiation exits the safety interlock device and strikes the IR
detector 429. The software pauses briefly at block 1401 after the IR emitter 427 is toggled on and then reads the IR detector 429 at block 1402 to determine if it is "ON" (i.e., that infrared radiation is detected). The software subsystem 482 then proceeds to a decision block 1404 where it queries whether the IR detector 429 is ON and either the IR emitter 427 is OFF
or the Ambient Lock is ON. In the case where the safety interlock device 461 is properly positioned, the IR detector 429 is ON, but the IR emitter 427 is ON and the Ambient Lock is OFF. Therefore, the answer to the query at decision block 1404 is "no". In other words, the IR detector 429 has seen infrared radiation from the emitter 427, which is indicative of proper positioning of the safety interlock device. The software then sets the Ambient Lock to OFF at block 1404a (which is no change from its initialized condition) and proceeds to another decision block 1406.
[00621 In the next decision block 1406, the software subsystem 482 can operate to bypass evaluation of the visible light detector 435 in a situation where either the Ambient Lock is ON (because infrared radiation was detected by detector 429 when the IR emitter 427 was OFF), or where the IR emitter 427, IR detector 429 and visible light emitter 433 are all OFF. In the present case, Ambient Lock is OFF and both the IR emitter 427 and IR
detector 429 are ON, so the software proceeds to read the visible light detector 435 at block 1408. The properly located safety interlock device 461 blocks the visible light detector 435 so the reading is OFF. Thus when queried at the next decision block 1410, the answer is "no" and the program moves to the next decision block 1412. The visible light emitter 433 has not been turned on yet so the program causes the visible light emitter to be turned on at block 1414 and moves to the end of the program where there is a delay 1415. The InstantOutput and Output were both initialized to OFF so that the pump 401 is not yet allowed to run. After the delay at 1415, the program returns to step 1400. The intermittent operation of the IR emitter 427 and conditional operation of the visible light emitter 433 provides significant power savings in operation of the pump 401.
This feature is helpful when the pump 401 is operated on battery power.
[0063] Proceeding back to the toggling step 1400, the IR emitter 427 is now turned OFF and the IR detector 435 reads OFF when it is queried at 1404 after the delay. As a result, the Ambient Lock stays OFF so that when the next decision block 1406 is reached the answer is again in the affirmative and the visible light detector 435 is read once again at 1408. The safety interlock device 461 still blocks the visible light detector 435 so the visible light detector is OFF. Unlike the first loop through the program steps, the visible light emitter 433 is now on so the program moves on to set the InstantOutput to ON at block 1416, indicating that the pump 401 should be allowed to operate for pumping fluid.
However, the program may not immediately allow the pump 401 to operate. As indicated in the next action block 1418, output filtering may be used before the final Output is given.
For instance, the software may require at block 1418 that there be a number of occurrences of the InstantOutput 1416 being set to ON before the final Output 1418 is set to ON.
Various algorithms for establishing confidence in the final output of the program could be employed. On the other hand, output filtering could be omitted in which case the Output 1418 would be equivalent to the InstantOutput 1416 in every instance. In either case, once the Output 1418 is set to ON, the pump 401 is allowed to operate. Once operation of the pump 401 is permitted, a routine for checking to make sure the safety interlock device 461 remains in position can be executed. In the illustrated embodiment, this is accomplished by continued operation of software subsystem 482. It is also envisioned that the visible light emitter 433 could be turned off again to conserve power. Various ways of operating the IR emitter 427 and visible light emitter 433 intermittently can be employed within the scope of the present invention.
[0064] It will be appreciated that there are several circumstances in which the software subsystem 482 would prevent operation of the pump 401 by detecting fault conditions indicative of the safety interlock device 461 of the feeding set 405 not being properly positioned on the pump. Reference is also made to Fig. 15 showing several conditions that can occur from the implementation of the software instructions found in the software subsystem 482. The conditions shown are not intended to be exhaustive, but representative of likely conditions to occur in the operation of the pump 401.
Until such time as the IR detector 429 detects infrared radiation (IR detector "ON"), the software subsystem 482 will not allow the pump 401 to operate. In other words, Output 1418 will never be set to ON until after the IR detector 429 has at least once detected infrared radiation. If the IR detector 429 has never been ON, when the software reaches decision block 1406, the answer will be "no" and the program will proceed to the end of the loop with Instant Output 1422 set to OFF. Similarly, the visible emitter 433 will not be turned on at 1414 until a point after infrared radiation from the IR emitter 427 has been detected by the IR detector 429. In that case, the software subsystem 482 proceeds from decision block 1406 to turn the visible emitter 433 is OFF (block 1420) and the InstantOutput is set to OFF (block 1422).
[00651 In the first condition or state of Fig. 15, both the IR emitter 427 and IR
detector 429 are OFF. This may occur, for example if the IR emitter 427 had been ON, but the IR detector 429 did not detect infrared radiation in a previous loop of the software subsystem 482 shown in Fig. 17. This would occur, for example if the feeding set 405 has not been installed. At decision block 1406, the answer to the query would have been "no", so the program would have set InstantOutput 1422 to OFF and passed to the end of the loop. In a second loop, the IR emitter 427 is toggled OFF so that now both the IR emitter and IR detector 429 are OFF as shown in condition 1. This is an indication that the feeding set 405 is not in place on the pump 401 (a "fault" condition). We note that the condition XX in the table of Fig. 15 is meant to indicate not applicable or inactive for the particular component in the specific condition described.
[00661 The second condition of Fig. 15 is the first of the conditions in which the feeding set 405 and safety interlock 461 would be detected. Previously, the software subsystem 482 would have cycled through a loop in which the visible light emitter 433 would have been turned on at 1414. This prior program loop is represented by condition 6 in which the IR emitter 427 and IR detector 429 are ON, but the visible light emitter 433 has not yet been energized so that Output is not yet allowed at block 1418 to be set to ON.
In the second loop, the IR emitter 427 and IR detector 429 are OFF, but when the program reaches block 1408 the visible light detector 435 is read. Assuming the feeding set 405 is properly in position, the visible light detector 435 will not be ON so that the software subsystem 482 finds the feeding set properly positioned and sets Output 1418 to ON so that the pump 401 may operate. Condition 8 recognizes that in a later loop of the software subsystem 482 the IR emitter 427, IR detector 429 and visible light emitter 433 may all be ON, but that a reading of OFF for the visible light detector 435 still allows results in Output 1418 being set to ON. Conditions 3 and 9 are similarly parallel, but in these conditions the visible light detector 435 detects light emitted from the visible light emitter 433, thus preventing the pump 401 from being activated to pump fluid to a patient.
[0067] Condition 4 illustrates a situation in which ambient electromagnetic radiation in the environment surrounding the pump 401 is detected by the IR
detector 429.
The IR emitter 427 is OFF, so the software subsystem 482 may know that the infrared radiation is not coming from the IR emitter. In that event, the software subsystem 482 receives a "yes" answer to the query at block 1404 and then sets AMBIENT LOCK
to ON
in block 1404b. As a result, the software subsystem 482 bypasses at block 1406 any evaluation of the presence of visible light and sets InstantOutput to OFF at 1422. In condition 5, the safety interlock device 461 is not in place so that the initial reading at block 1402 of the IR detector 429 with the IR emitter 427 ON will be that the IR detector is OFF. The software subsystem 482 will immediately proceed after block 1406 through blocks 1420 and 1422 to set Output (at block 1418) to OFF without any further evaluation of visible light. The pump 401 may also be configured to indicate there is a BRIGHT
ambient light condition such as might occur if the pump was placed in or near a window in home use. The indication of bright ambient light would instruct the user to move the pump to a lower light location.
[0068] The software subsystem 482 is also capable of detecting a condition in which there is excessively bright ambient light. As shown in condition 7, the IR emitter 427 and IR detector 429 are both ON, which is indicative of the feeding set 405 being properly positioned on the pump 401. In fact, the set 405 either has not been properly loaded, or an improper set that does not block visible light has been loaded.
However, although the visible light emitter 433 is OFF, the visible light detector 435 detects visible light. The software subsystem 482 proceeds at decision block 1410, when the visible light detector 435 is ON, to block 1420 and 1422 so InstantOutput is set to OFF and the pump 401 cannot run.

[0069] Another software subsystem 484 that could be used to operate the controller 477 of the pump 401 is illustrated in Fig. 18. In this system for detecting proper placement of the feeding set 405 including the safety interlock device 461, the IR
emitter 427 is not turned off and on (i.e., it is not "pulsed"). Thus after the initialization step 1428, the IR
emitter 427 is turned on at block 1430 and remains on while the pump 401 is powered. As illustrated in condition 1 in the table of Fig. 19 showing selected operating conditions of the software subsystem 484 of Fig. 18, the only time the IR emitter 427 is OFF
is when the pump 401 is not yet turned on. Referring again to Fig. 18, the software subsystem 484 delays at block 1431 after the IR emitter 427 is turned on before reading the IR detector 429 at block 1432. The software subsystem 484 conditions any further checks for confirming the feeding set is properly positioned on the detection of infrared radiation by the IR detector 429 at block 1433. Condition 2 illustrates the situation where the IR
emitter 427 is on, but infrared radiation is not detected by the IR detector 429. Once the IR detector 429 detects infrared radiation, the program proceeds in a first loop to read the visible light detector 435 at block 1434 to make certain the visible light detector is OFF
(block 1435), and then turns the visible light emitter 433 ON at block 1436.
After a delay at block 1437, the software subsystem 484 proceeds to a second loop in which the software subsystem 484 confirms that visible light is blocked at 1435 and because the visible light emitter 433 is found to be ON at 1438 sets InstantOutput to ON
at block 1440.
Assuming no further output filtering, Output is set to ON at block 1442 and the pump 401 is permitted to operate. However if visible light is detected (i.e., at block 1434) prior to activation of the visible light emitter 433, the visible light emitter is prevented from being turned on. In that case, the software subsystem 484 will proceed to block 1444 to turn the visible light emitter 433 off, and at block 1446 to set InstantOutput to OFF.
Detection of visible light by the visible light detector 435 prior to activation of the visible light emitter is shown in condition 3 of Fig. 19.
[0070] Conditions 4 and 6 both result in the software subsystem 484 setting Output 1442 to ON and allowing the pump 401 to operate because the feeding set and safety interlock device 461 are detected. Conditions 5 and 7 illustrate circumstances in which the detection of visible light by the visible light detector 435 prevents operation of the pump even though infrared radiation has been detected by the IR detector 429. In condition 7, the visible light detector 435 may be detecting either light from the visible light emitter 433 or from ambient. In either case, the pump 401 is not permitted to operate.
In Figs. 17 and 18 other variations may be described by tracing a path through the flow chart, as shown [00711 Figures 20 and 21 show a fragmentary portion of a pump 601 adjacent a seat 602 of the pump, and safety interlock device 603 of a tenth embodiment of the present invention. The safety interlock device 603 comprises a material that transmits both infrared radiation and visible light. The safety interlock device 603 includes a blocking portion 607 that is opaque to the transmission of visible light so that the visible light is not transmitted to the visible light detector 609 when the safety interlock device is loaded on the pump. The safety interlock device 603 includes a key 613 that is received in a corresponding slot 615 in the pump housing so that the safety interlock device 603 must be aligned with the blocking portion 607 generally adjacent the visible light detector. In the illustrated embodiment, the key 613 is a protrusion extending from the safety interlock device 603 but it is understood that the key and the corresponding slot 615 could be other shapes and sizes without departing from this invention. Other structures for keying the position of a safety interlock device in a pump may be used within the scope of the present invention.

[00721 When the safety interlock device 603 is loaded in the pump 601 infrared electromagnetic radiation from the IR emitter 616 is diffused and reflected through the safety interlock device and detected by the IR detector 617 to verify that the set has been loaded. Next, the visible light detector 609 will check for visible light in the pump 601 will not detect any because of the location of the blocking portion 607 of the safety interlock device 603 that blocks visible light. In the embodiment of Fig. 20, the visible light emitter 619 will be emitted, sending a visible light signal into the safety interlock device 603. The visible light signal will not be transmitted to the visible light detector 609 because of the present of the blocking portion 607 and the control system of the pump 601 will allow the pump to operate.

[00731 Figure 22 shows a fragmentary section of a pump 701 including a seat 702, and safety interlock device 703 of an eleventh embodiment of the present invention. The safety interlock device 703 is made of a material that transmits infrared radiation, but blocks electromagnetic radiation in the visible range so that the visible light is not transmitted to a visible light detector 709 when the safety interlock device is loaded on the pump 701. Other suitable constructions for passing electromagnetic radiation of one wavelength and blocking electromagnetic radiation of another wavelength may be employed within the scope of the present invention. An arrangement of visible and infrared emitters and detectors like that shown in Fig. 20 may be employed in the eleventh embodiment, although different arrangements are also possible.
[00741 The safety interlock device 703 comprises an outer member 704 and an inner member 706. The outer member includes an upper tubular portion 708, a lower tubular portion 710 and an annular flange 712. The annular flange has upper and lower annular channels 714. In the illustrated embodiment, the channels allow less material to be used, but have no effect on the operation of the safety interlock device 703. A first tube section 757 of a feeding set is received in the upper portion 708 of the outer member 704 of the safety interlock device 703 and a second tube section 763 is received over the lower portion 710 of the outer member.
[00751 The outer member 704 is made of the material that selectively blocks visible light and passes infrared radiation. The inner member 706 can be made of the same material as the outer member, or of a different material. However, the inner member 706 is substantially opaque to electromagnetic radiation in the infrared range and also in the visible range, and is also preferably highly reflective. In the illustrated embodiment, the inner member 706 is made of the same material as the outer member 704, but is white in color. The inner member 706 can be formed as one piece with the outer member 704, such as by a dual injection or extrusion process. Additionally, the outer and inner members 704, 706 could be made as separate pieces and attached to each other in a suitable manner such as bonding or welding. The inner member 706 is positioned in the optical path of the infrared radiation that enters the safety interlock device 703, and is disposed between the infrared radiation path and first tube section 757. Accordingly, an outer surface of the inner member 706 defines an "inner boundary region" in this eleventh embodiment for reflecting infrared radiation. The inner member 706 inhibits the loss of internal reflection of infrared radiation that might be caused by the presence of certain liquids (e.g., water) flowing in the tube 757. Thus, a strong reflection of infrared radiation to the infrared radiation detector (not shown) can be made regardless of the optical characteristics of the fluid flowing through the tube 757.

[0076] When introducing elements of the present invention or the preferred embodiment(s) thereof, the articles "a", "an", "the" and "said" are intended to mean that there are one or more of the elements. The terms "comprising", "including" and "having"
are intended to be inclusive and mean that there may be additional elements other than the listed elements. Moreover, the use of "up", "down", "top" and "bottom" and variations of these terms is made for convenience, but does not require any particular orientation of the components.
[0077] As various changes could be made in the above without departing from the scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims (144)

WHAT IS CLAIMED IS:
1. A feeding set for use in an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump, the feeding set comprising:
a conduit for carrying the liquid nutrient to a patient;
a safety interlock device connected to the conduit and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation, the safety interlock device comprising a propagation affecting member including an outer member formed of a material that transmits infrared radiation and blocks visible light and an inner member defining an inner boundary region that substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation, wherein upon proper loading of the safety interlock device on the pump the safety interlock device guides infrared radiation to the infrared radiation detector by internally reflecting the infrared radiation and prevents visible light from reaching the visible light detector.
2. The feeding set as set forth in claim 1 wherein the inner member is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
3. The feeding set as set forth in claim 2 wherein the inner member is white in color.
4. The feeding set as set forth in claim 1 wherein the inner boundary region is a polished surface.
5. The feeding set as set forth in claim 1 wherein the outer member has an opening that receives the conduit.
6. The feeding set as set forth in claim 5 wherein the propagation affecting member is adapted to pass the liquid nutrient therethrough.
7. The feeding set as set forth in claim 1 wherein the outer member is adapted to diffuse infrared radiation within the outer member.
8. The feeding set as set forth in claim 1 wherein the safety interlock device includes a key engageable with the enteral feeding pump to orient the safety interlock device in a predetermined position when mounted on the pump.
9. A feeding set for use in an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump, the feeding set comprising:
conduit means for carrying the liquid nutrient to a patient;
interlock means for locating the feeding set on the pump, said interlock means being connected to said conduit means and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation, said interlock means comprising a propagation affecting member including an outer member formed of a material that transmits infrared radiation and blocks visible light and an inner member defining an inner boundary region that substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation, wherein upon proper loading of said interlock means on the pump said interlock means guides infrared radiation to the infrared radiation detector by internally reflecting the infrared radiation and prevents visible light from reaching the visible light detector.
10. A pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for detecting electromagnetic radiation generally of a first wavelength and providing an indication that the pump set is properly loaded on the pumping apparatus, and a second electromagnetic radiation detector for detecting electromagnetic radiation generally of a second wavelength different from the first wavelength and providing an indication that the pump set is not properly loaded on the pumping apparatus, the pump set comprising:
a conduit for carrying fluid to a patient;
a safety interlock device associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation, the safety interlock device being adapted to transmit therethrough electromagnetic radiation of the first wavelength, and adapted not to transmit the electromagnetic radiation of the second wavelength wherein upon proper loading of the safety interlock device on the pumping apparatus the safety interlock device guides electromagnetic radiation of the first wavelength to the first detector and prevents electromagnetic radiation of the second wavelength from reaching the second detector.
11. A pump set as set forth in claim 10 wherein the first wavelength is generally in the infrared range of electromagnetic radiation and the second wavelength is generally in at least one of the visible range and the ultraviolet range of electromagnetic radiation.
12. A pump set as set forth in claim 11 wherein the safety interlock device is formed of a material that filters out visible light and transmits infrared radiation.
13. A pump set as set forth in claim 12 wherein said safety interlock device comprises an outer layer for filtering out visible light and an inner layer that transmits both visible light and infrared radiation.
14. A pump set as set forth in claim 12 wherein the safety interlock device diffuses electromagnetic radiation of the first wavelength to guide it to the first detector.
15. A pump set as set forth in claim 14 wherein the safety interlock device internally reflects the diffused electromagnetic radiation to guide it to the first detector.
16. A pump set as set forth in claim 12 wherein the safety interlock device refracts electromagnetic radiation of the first wavelength to guide it to the first detector.
17. A pump set as set forth in claim 12 wherein the safety interlock device internally reflects electromagnetic radiation of the first wavelength along a path to guide it to the first detector.
18. A pump set as set forth in claim 17 wherein said safety interlock device comprises a reflective surface adapted to reflect said electromagnetic radiation.
19. A pump set as set forth in claim 10 wherein the safety interlock device has an angled surface shaped to reflect radiation of the first wavelength at an angle to impinge the first detector.
20. A pump set as set forth in claim 10 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member having a top surface, a bottom surface and a side surface, the top and bottom surfaces being covered with a layer of material opaque to the radiation of the first wavelength and the side being free of material opaque to radiation of the first wavelength.
21. A pump set as set forth in claim 10 in combination with the pumping apparatus.
22. A pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for providing an indication that the pump set is properly loaded on the pumping apparatus, and a second electromagnetic radiation detector for detecting electromagnetic radiation, the pump set comprising:
a conduit for carrying fluid to a patient;

a safety interlock device associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation, the safety interlock device is transmissive to said electromagnetic radiation that can be detected by the first detector, at least a portion of said safety interlock device comprising a material opaque to the transmission of electromagnetic radiation that can be detected by the second detector, so that upon proper loading of the safety interlock device on the pumping apparatus the safety interlock device guides said electromagnetic radiation to the first detector and prevents said electromagnetic radiation that can be detected by the second detector from reaching the second detector.
23. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member including a blocking portion adapted to block emissions of electromagnetic radiation from said electromagnetic radiation propagation affecting member at a selected location of the member.
24. The pump set as set forth in claim 22 wherein said safety interlock device is adapted for keyed engagement with the pumping apparatus for positioning the safety interlock device in a predetermined orientation on the pumping apparatus.
25. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member including a material that diffuses electromagnetic radiation received from the source of electromagnetic radiation for guiding the electromagnetic radiation to the first detector.
26. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member adapted to refract the electromagnetic radiation from the source of electromagnetic radiation to the first detector.
27. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member including a reflector to reflect the electromagnetic radiation to the first detector.
28. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member including a light pipe for the passage of the electromagnetic radiation to the first detector.
29. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member including a material that is opaque to visible light and allows transmission of infrared radiation therethrough.
30. The pump set as set forth in claim 22 wherein the safety interlock device comprises an electromagnetic radiation propagation affecting member having at least one hole therein sized and positioned to diffract electromagnetic radiation from the source of electromagnetic radiation.
31. A pump set for use in a pumping apparatus having a control system for controlling operation of the pumping apparatus to supply fluid to a patient through the pump set loaded in the pumping apparatus, a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation, an electromagnetic radiation detector operatively connected to the control system for providing an indication that the pump set is properly loaded on the pumping apparatus, the pump set comprising:
a conduit for carrying fluid to a patient;
an electromagnetic radiation propagation affecting member associated with the conduit and adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation, the propagation affecting member comprising an outer member formed of a material that is transmissive to electromagnetic radiation and an inner boundary region that substantially reflects the electromagnetic radiation.
32. The pump set as set forth in claim 31 wherein the inner boundary region extends substantially around a longitudinal axis of the conduit.
33. The pump set as set forth in claim 32 wherein the inner boundary region is defined by an inner member.
34. The pump set as set forth in claim 33 wherein the inner member and the outer member are formed of different materials.
35. The pump set as set forth in claim 33 wherein the inner member is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
36. The pump set as set forth in claim 33 wherein the inner member is white in color.
37. The pump set as set forth in claim 32 wherein the inner boundary region is a polished surface.
38. The pump set as set forth in claim 32 wherein the outer member has an opening that receives the conduit.
39. The pump set as set forth in claim 31 wherein the propagation affecting member is adapted to pass fluid therethrough.
40. A feeding set for use in an enteral feeding pump having a control system for controlling operation of the enteral feeding pump to supply liquid nutrient to a patient through the feeding set loaded in the pump, a source of infrared radiation operatively connected to the control system of the pump for emitting infrared radiation, an infrared radiation detector operatively connected to the control system for detecting infrared radiation and providing an indication that the feeding set is properly loaded on the pump, and a visible light detector for detecting visible light and providing an indication that the feeding set is not properly loaded on the pump, the feeding set comprising:
a conduit for carrying the liquid nutrient to a patient;
a safety interlock device connected to the conduit and adapted for mounting on the pump in the path of the infrared radiation from the source of infrared radiation, and a second source, the second source being a visible light emitter, the safety interlock device comprising a propagation affecting member that transmits infrared radiation and blocks visible light and the member substantially reflects the infrared radiation within the propagation affecting member to change the direction of propagation, wherein upon proper loading of the safety interlock device on the pump the safety interlock device guides infrared radiation to the first detector and prevents visible light from reaching the second detector.
41. The feeding set as set forth in claim 40 further comprising an inner member that is substantially opaque to electromagnetic radiation in the visible and infrared ranges.
42. The feeding set as set forth in claim 41 wherein the inner member is white in color.
43. The feeding set as set forth in claim 40 wherein the safety interlock device has an opening that receives the conduit.
44. The feeding set as set forth in claim 43 wherein the propagation affecting member is adapted to pass the liquid nutrient therethrough.
45. The feeding set as set forth in claim 40 wherein the safety interlock device includes a key engageable with the enteral feeding pump to orient the safety interlock device in a predetermined position when mounted on the pump.
46. A feeding set as set forth in claim 40 wherein said safety interlock device comprises an outer layer for filtering out visible light and an inner layer that transmits both visible light and infrared radiation.
47. A feeding set as set forth in claim 40 wherein the safety interlock device diffuses infrared radiation to guide it to the first detector.
48. A feeding set as set forth in claim 47 wherein the safety interlock device internally reflects the diffused infrared radiation to guide it to the first detector.
49. A feeding set as set forth in claim 40 wherein the safety interlock device refracts infrared radiation to guide it to the first detector.
50. A feeding set as set forth in claim 40 wherein the safety interlock device internally reflects infrared radiation along a path to guide it to the first detector.
51. A feeding set as set forth in claim 50 wherein said safety interlock device comprises a reflective surface adapted to reflect said infrared radiation.
52. A feeding set as set forth in claim 40 wherein the safety interlock device has an angled surface shaped to reflect infrared radiation at an angle to impinge the first detector.
53. A feeding set as set forth in claim 40 wherein the propagation affecting member comprises an electromagnetic radiation propagation affecting member having a top surface, a bottom surface and a side surface, the top and bottom surfaces being covered with a layer of material opaque to the infrared radiation and the side surface being free of material opaque to infrared radiation.
54. A feeding set as set forth in claim 40 in combination with the pump.
55. A feeding set as set forth in claim 40 wherein at least a portion of the safety interlock device is opaque to the infrared radiation from the source of electromagnetic radiation, said opaque portion having at least one hole therethrough for diffracting the infrared radiation from the source so that the infrared radiation impinges both the first and second detector.
56. A feeding set as set forth in claim 40 wherein the electromagnetic radiation propagation affecting member is associated with the conduit and is adapted for mounting in the pumping apparatus in the path of the electromagnetic radiation from the source of electromagnetic radiation, the propagation affecting member comprising an outer member formed of a material that is transmissive to electromagnetic radiation and an inner boundary region that substantially reflects the electromagnetic radiation.
57. The feeding set as set forth in claim 1 wherein the infrared radiation is twice reflected before being detected by the first detector.
58. An enteral feeding pump for use with a feeding set having a conduit to deliver a supply of liquid nutrient to a patient and a safety interlock device associated with the conduit, the enteral feeding pump comprising:

a pumping device operable to act on the feeding set to drive flow of the fluid in the feeding set;
a control system for controlling operation of the pumping device;
a source of infrared radiation operatively connected to the control system of the pump, the control system being configured to intermittently energize the source of infrared radiation to emit infrared radiation in a direction for striking the safety interlock device of the feeding set when mounted on the pump, the propagation of infrared radiation being capable of being affected by the safety interlock device;
a first detector mounted on the pump in an alcove formed by the pump to shield the first detector from ambient electromagnetic radiation, the first detector being located relative to the source of infrared radiation so that infrared radiation emitted from the first source will not impinge upon the first detector unless propagation of the infrared radiation emitted from the source is affected by the safety interlock device, the first detector being operatively connected to the control system and arranged for receiving said infrared radiation when its propagation from the source of infrared radiation is affected by the safety interlock device, the first detector providing an indication to the control system that the pump set conduit is properly positioned in the pump;
a source of visible light operatively connected to the control system of the pump, the control system being configured to intermittently energize the source of visible light for emitting visible light in a direction for striking the safety interlock device of the feeding set, the visible light being capable of being filtered out by the safety interlock device;
a second, visible light detector mounted on the pump in an alcove formed by the pump to shield the second detector from ambient electromagnetic radiation, the second detector being operatively connected to the control system and arranged for receiving visible light from the source of visible light when the visible light is not filtered out for use in verifying detection of the feeding set by the first detector.
59. An enteral feeding pump as set forth in claim 58 wherein the pump has a key formation permitting the safety interlock device to be mounted on the pump only in a predetermined orientation.
60. An enteral feeding pump as set forth in claim 58 wherein the control system is configured to energize the source of visible light only after the first detector has detected infrared radiation from the source of infrared radiation.
61. An enteral feeding pump as set forth in claim 60 wherein the control system is configured to operate the pumping device for pumping nutritional liquid to the patient when infrared radiation is detected by the first detector and no visible light is detected by the second detector.
62. An enteral feeding pump for use with a feeding set having a conduit to deliver a supply of liquid nutrient to a patient and a safety interlock device associated with the conduit, the enteral feeding pump comprising:
pumping means operable to act on the feeding set for driving flow of the fluid in the feeding set;
control means for controlling operation of said pumping means;
first source means for emitting infrared radiation, said first source means being operatively connected to the control means of the pump, said control means being configured to intermittently energize said first source means to emit infrared radiation in a direction for striking the safety interlock device of the feeding set when mounted on the pump, the propagation of infrared radiation being capable of being affected by the safety interlock device;
first detector means for detecting infrared radiation from said first source means, said first detector means being mounted on the pump in an alcove formed by the pump to shield the first detector means from ambient electromagnetic radiation, said first detector means being located relative to said first source means so that infrared radiation emitted from said first source means will not impinge upon said first detector means unless propagation of the infrared radiation emitted from said first source means is affected by the safety interlock device, said first detector means being operatively connected to said control means and arranged for receiving said infrared radiation when its propagation from said first source means is affected by the safety interlock device, said first detector means providing an indication to said control means that the pump set conduit is properly positioned in the pump;
second source means for emitting visible light, said second source means being operatively connected to said control means of the pump, said control means being configured to energize said second source means for emitting visible light in a direction for striking the safety interlock device of the feeding set, the visible light being capable of being filtered out by the safety interlock device;
second detector means for detecting visible light from said second source means, said second detector means being mounted on the pump in an alcove formed by the pump to shield said second detector means from ambient electromagnetic radiation, said second detector means being operatively connected to said control means and arranged for receiving visible light from said second source means when the visible light is not filtered out for use in verifying detection of the pump set by the first detector means.
63. A pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit, the pumping apparatus comprising:
a pumping device operable to act on the pump set to drive flow of the fluid in the pump set;
a control system for controlling operation of the pumping device;
a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set, the electromagnetic radiation being of a wavelength selected so that the safety interlock device can affect the propagation of the electromagnetic radiation;
a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving said electromagnetic radiation when its propagation from the source of electromagnetic radiation is affected by the safety interlock device, and providing an indication to the control system that the pump set conduit is properly positioned in the pumping apparatus;

a second electromagnetic radiation detector operatively connected to the control system and arranged for receiving electromagnetic radiation when the electromagnetic radiation propagation is not affected by the safety interlock device to be prevented from reaching the second detector for use in verifying detection of the pump set conduit by the first detector.
64. Pumping apparatus as set forth in claim 63 wherein the source of electromagnetic radiation is adapted to emit electromagnetic radiation generally of a first wavelength, the first detector being configured to detect electromagnetic radiation of a wavelength emitted by the source of electromagnetic radiation and the second detector being configured not to detect electromagnetic radiation of the first wavelength.
65. Pumping apparatus as set forth in claim 64 wherein the electromagnetic radiation emitted by the source of electromagnetic radiation is infrared.
66. Pumping apparatus as set forth in claim 65 wherein the second detector is configured to detect electromagnetic radiation in at least one of the visible range and the ultraviolet range.
67. Pumping apparatus as set forth in claim 64 wherein the source of electromagnetic radiation constitutes a first source, the apparatus further comprising a second source of electromagnetic radiation of a second wavelength different from the first wavelength, the second detector being configured to detect the electromagnetic radiation of the second wavelength and the first detector being configured not to detect electromagnetic radiation of the second wavelength.
68. Pumping apparatus as set forth in claim 67 wherein the first and second detectors are arranged on the pumping apparatus so that the safety interlock device properly positioned on the pumping apparatus blocks the second detector from receiving electromagnetic radiation of the second wavelength from the second source and guides electromagnetic radiation of the first wavelength from the first source to the first detector.
69. Pumping apparatus as set forth in claim 67 wherein the control system operates at least one of the first and second sources of electromagnetic radiation to emit electromagnetic radiation intermittently.
70. Pumping apparatus as set forth in claim 69 wherein the first source of electromagnetic radiation is operated intermittently to generate a pattern of emitter activations in which electromagnetic radiation is emitted from the first source.
71. Pumping apparatus as set forth in claim 70 wherein the control system operates said first detector intermittently in a series of detector activations to detect the presence of electromagnetic radiation from the first source.
72. Pumping apparatus as set forth in claim 70 wherein the number of detector activations is greater than the number of emitter activations.
73. Pumping apparatus as set forth in claim 72 wherein said control system has a ratio of detector activations to emitter activations of about 2:1.
74. Pumping apparatus as set forth in claim 69 wherein the control system is adapted to operate the first source to emit electromagnetic radiation in a predetermined pattern and to recognize when said predetermined pattern is detected by the first detector.
75. Pumping apparatus as set forth in claim 67 wherein said second source of electromagnetic radiation of a second wavelength comprises a blue light.
76. Pumping apparatus as set forth in claim 67 wherein said second source emits electromagnetic radiation after said first detector detects electromagnetic radiation of the first wavelength.
77. Pumping apparatus as set forth in claim 63 wherein said second detector detects an elevated amount of electromagnetic radiation of the second wavelength and issues a warning.
78. A pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit, the pumping apparatus comprising:
a pumping device operable to act on the pump set to drive flow of the fluid in the pump set;
a control system for controlling operation of the pumping device;
a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set, the electromagnetic radiation being of a wavelength selected so that the safety interlock device can propagate therethrough the electromagnetic radiation;
a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving said electromagnetic radiation when its propagation from the source of electromagnetic radiation is affected by the safety interlock device properly positioned on the pumping apparatus;
a second electromagnetic radiation detector operatively connected to the control system and arranged for receiving said electromagnetic radiation from the source of electromagnetic radiation.
79. Pumping apparatus as set forth in claim 78 wherein the electromagnetic radiation emitted by the source of electromagnetic radiation is infrared.
80. Pumping apparatus as set forth in claim 78 wherein the electromagnetic radiation emitted by the source of electromagnetic radiation is visible light.
81. Pumping apparatus as set forth in claim 78 wherein the control system is programmed to recognize that a pump set is properly loaded on the pumping apparatus when both the first and second detectors detect radiation from the source of electromagnetic radiation.
82. Pumping apparatus as set forth in claim 81 wherein the source of electromagnetic radiation and the second detector are arranged so that the second detector also detects radiation from the source when the pump set is not properly loaded on the pumping apparatus.
83. Pumping apparatus as set forth in claim 78 in combination with the pump set.
84. Pumping apparatus as set forth in claim 83 wherein the safety device is adapted to diffuse the light from the source of electromagnetic radiation when properly positioned on the pump set so that the radiation impinges on both the first and second detectors.
85. Pumping apparatus as set forth in claim 83 wherein the safety device is adapted to diffract the electromagnetic radiation from the source when properly positioned on the pumping apparatus so that the radiation impinges on both the first and second detectors.
86. Pumping apparatus as set forth in claim 85 wherein said safety device has an opening adapted to diffract the radiation from the source and the first and second detectors being spaced apart a distance so that radiation through the opening impinges on both the first and second detectors.
87. Pumping apparatus as set forth in claim 86 further comprising third and other electromagnetic radiation detectors positioned for detecting the electromagnetic radiation when diffracted by the safety device.
88. Pumping apparatus as set forth in claim 78 wherein the second detector is disposed to receive electromagnetic radiation from the source when the pump set is not properly positioned on the pumping apparatus and not to receive electromagnetic radiation from the source when the pump set is properly positioned on the pumping apparatus.
89. Pumping apparatus as set forth in claim 88 in combination with the pump set.
90. Pumping apparatus as set forth in claim 89 wherein the safety interlock device refracts electromagnetic radiation from the source away from the second detector and toward the first detector when the pump set is properly positioned on the pumping apparatus.
91. Pumping apparatus as set forth in claim 90 wherein the first and second detector are spaced apart a distance and said safety interlock device comprises a material having a density that refracts said electromagnetic radiation an amount generally equal to said distance.
92. A pumping apparatus for use with a pump set having a conduit to deliver a supply of fluid to a patient and a safety interlock device associated with the conduit, the pumping apparatus comprising:
a pumping device operable to act on the pump set to drive flow of the fluid in the pump set;
a control system for controlling operation of the pumping device;
a source of electromagnetic radiation operatively connected to the control system of the pumping apparatus for emitting electromagnetic radiation in a direction for striking the safety interlock device of the pump set;
a first electromagnetic radiation detector operatively connected to the control system and arranged for receiving said electromagnetic radiation when its propagation from the source of electromagnetic radiation is affected by the safety interlock device properly positioned on the pumping apparatus;
a second electromagnetic radiation detector operatively connected to the control system;

wherein the control system is operable to control the source of electromagnetic radiation and the first detector to activate intermittently, and to permit activation of the pumping device only after electromagnetic radiation from the source is detected by the first detector.
93. The pumping apparatus as set forth in claim 92 wherein the control system permits activation of the pumping device only if electromagnetic radiation is not detected by the second electromagnetic radiation detector.
94. The pumping apparatus as set forth in claim 92 wherein the source of electromagnetic radiation constitutes a first source, the apparatus further comprising a second source of electromagnetic radiation positioned to emit radiation for striking the second detector in the absence of the safety interlock device.
95. The pumping apparatus as set forth in claim 94 wherein the control system is operable to activate the second source only after electromagnetic radiation is detected by the first detector.
96. The pumping apparatus as set forth in claim 92 wherein the control system is operable to activate the first detector more than it activates the source of electromagnetic radiation in a given period.
97. The pumping apparatus as set forth in claim 86 wherein the control system is operable to provide activations of the first detector relative to activations of the source of electromagnetic radiation in a ratio of about 2:1.
98. An enteral feeding pump and feeding set for use to deliver a supply of nutrient liquid to a patient, the feeding set comprising a conduit for the nutrient liquid and a safety interlock device associated with the conduit, the enteral feeding pump comprising:

a pumping device operable to act on the feeding set to drive flow of the liquid in the feeding set;

a control system for controlling operation of the pumping device;
a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation in a direction for striking the safety interlock device of the feeding set, the electromagnetic radiation being of a wavelength selected so that the safety interlock device can affect the propagation of the electromagnetic radiation;

an electromagnetic radiation detector operatively connected to the control system and arranged for receiving said electromagnetic radiation when its propagation from the source of electromagnetic radiation through the safety interlock device is affected by the safety interlock device, and providing an indication to the control system that the feeding set conduit is properly positioned in the feeding pump.
99. The enteral pump and feeding set as set forth in claim 98 wherein said safety interlock device comprises an electromagnetic radiation propagation affecting member received in a recess of the pump when the enteral feeding set is properly loaded, the propagation affecting member comprising a material that diffuses electromagnetic radiation received from the electromagnetic radiation source.
100. The enteral pump and feeding set as set forth in claim 98 wherein the source of electromagnetic radiation and the radiation detector are arranged relative to each other so that electromagnetic radiation from the source of electromagnetic radiation will not impinge upon the radiation detector unless the path of the electromagnetic radiation is altered.
101. The enteral pump and feeding set as set forth in claim 100 wherein the source of electromagnetic radiation and the radiation detector are arranged relative to each other at an angle other than about 180 degrees.
102. The enteral pump and feeding set as set forth in claim 98 wherein said source of electromagnetic radiation and detector are parallel to receive the electromagnetic radiation transmitted from the safety interlock device when the feeding set conduit is properly loaded in the pump.
103. The enteral pump and feeding set as set forth in claim 102 wherein said safety interlock device comprises a reflector to reflect the electromagnetic radiation to the detector when the feeding set conduit is properly loaded in the pump.
104. The enteral pump and feeding set as set forth in claim 103 wherein said reflector comprises reflective tape affixed to the safety interlock device.
105. The enteral pump and feeding set as set forth in claim 103 wherein said reflector comprises polished metal.
106. The enteral pump and feeding set as set forth in claim 98 wherein said safety interlock device comprises a light pipe for the passage of the electromagnetic radiation by internal reflection within the light pipe through the safety interlock device.
107. The enteral pump and feeding set as set forth in claim 98 further comprising an alcove in the feeding pump for mounting the source of electromagnetic radiation and the detector and shielding the detector and source of electromagnetic radiation from ambient light.
108. The enteral pump and feeding set as set forth in claim 98 wherein said safety interlock device has an opaque covering to prevent ambient light from passing to the detector when the enteral feeding set conduit is properly loaded into the pump.
109. The enteral pump and feeding set as set forth in claim 98 wherein said source of electromagnetic radiation comprises an infrared emitter and said detector comprises an infrared detector.
110. The enteral pump and feeding set as set forth in claim 109 further comprising a visible light detector operatively connected to the control system for detecting the presence of visible light.
111. An enteral feeding set for an enteral feeding pump having a control system for controlling operation of the pump to supply nutrient liquid to a patient through the enteral feeding set loaded in the pump, a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation, and an electromagnetic radiation detector operatively connected to the control system for receiving the electromagnetic radiation and providing an indication to the control system that the feeding set is properly loaded in the feeding pump, the enteral feeding set comprising:
a conduit for carrying nutrient liquid to a patient;
a safety interlock device associated with the conduit and adapted for mounting in the pump, the safety interlock device comprising an electromagnetic radiation propagation affecting member formed to affect the propagation of electromagnetic radiation from the source of electromagnetic radiation through the safety interlock device when properly loaded on the pump for directing the electromagnetic radiation from the source of electromagnetic radiation to the detector when the conduit is properly loaded in the pump such that nutrient liquid flow to the patient is regulated by the pump.
112. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member comprises a material that diffuses electromagnetic radiation received from the source of electromagnetic radiation.
113. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member is adapted to refract the electromagnetic radiation from the source of electromagnetic radiation to the detector.
114. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member comprises a reflector to reflect the electromagnetic radiation to the detector when the feeding set conduit is properly loaded in the pump.
115. The enteral feeding set as set forth in claim 114 wherein said reflector comprises reflective tape affixed to the remainder of the safety interlock device.
116. The enteral feeding set as set forth in claim 114 wherein said reflector comprises polished metal.
117. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member comprises a light pipe for the passage of the electromagnetic radiation through the safety interlock device.
118. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member has an opaque covering to prevent visible light from passing through at least a portion of said electromagnetic radiation propagation affecting member.
119. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member comprises a material that is opaque to visible light and allows transmission of infrared radiation therethrough.
120. The enteral feeding set as set forth in claim 111 wherein said electromagnetic radiation propagation affecting member has at least one hole therein sized and positioned to diffract electromagnetic radiation from the source of electromagnetic radiation.
121. A safety interlock device for an enteral feeding set that may be used with an enteral feeding pump having a control system for controlling operation of the pump to supply fluid to a patient through the enteral feeding set loaded in the pump, a source of electromagnetic radiation operatively connected to the control system of the pump for emitting electromagnetic radiation, a first electromagnetic radiation detector operatively connected to the control system for detecting electromagnetic radiation generally of a first wavelength and providing an indication that the enteral feeding set is properly loaded on the pump, and a second electromagnetic radiation detector for detecting electromagnetic radiation generally of a second wavelength different from the first wavelength and providing an indication that the enteral feeding set is not properly loaded on the pump, the safety interlock device comprising:
a radiation propagation affecting member adapted for attachment to the enteral feeding set formed to transmit electromagnetic radiation of the first wavelength therethrough, and formed not to transmit the electromagnetic radiation of the second wavelength wherein upon proper loading of the safety interlock device on the pump the radiation propagation affecting member guides electromagnetic radiation of the first wavelength to the first detector and prevents electromagnetic radiation of the second wavelength from reaching the second detector.
122. A safety interlock device as set forth in claim 121 wherein the radiation propagation affecting member has a first end adapted for fluid connection with a conduit section of the enteral feeding set and a second end adapted for fluid connection with another conduit section of the enteral feeding set.
123. A method of using a feeding set on an enteral feeding pump, said feeding set having an interlock device adapted to be inserted into a recess of the enteral feeding pump, said method comprising:
inserting the interlock device into the recess of the enteral feeding pump;
intermittently emitting infrared radiation in a direction for striking the inserted interlock device;
transmitting and internally reflecting the infrared radiation within the interlock device to redirect the infrared radiation toward a first detector when the interlock device is properly inserted in the pump recess;
detecting with the first detector the infrared radiation redirected within the interlock device;

intermittently energizing a visible light emitter only after infrared radiation has been detected by the first detector;
filtering visible light with the interlock device to prevent transmission through the interlock device;
reading a second detector to verify that visible light emitted by the visible light emitter has been blocked; and enabling operation of the enteral feeding pump to pump nutrient liquid in the feeding set in response to detection of infrared radiation by the first detector and the verification that no visible light is detected by the second detector.
124. A method as set forth in claim 123 wherein the step of inserting the interlock device into the recess comprises aligning a key on one of the interlock device and pump with a slot on the other of the interlock device and pump and moving the interlock device onto the pump so that the key is received in the slot.
125. A method as set forth in claim 123 further comprising attaching a conduit to the interlock device.
126. A method as set forth in claim 125 wherein the step of attaching a conduit to the interlock device comprises attaching a first end of the interlock device to a first conduit section and attaching a second end of the interlock device to a second conduit section.
127. A method of using a feeding set on an enteral feeding pump, said feeding set having an interlock device adapted to be inserted into a recess of the enteral feeding pump, said method comprising:
inserting the interlock device into the recess of the enteral feeding pump;
emitting electromagnetic radiation in a direction for striking the inserted interlock device;
detecting at least a portion of the electromagnetic radiation striking the interlock device when the interlock device is properly inserted in the pump recess; and enabling operation of the enteral feeding pump to pump nutrient liquid in the feeding set in response to the detected electromagnetic radiation.
128. The method as set forth in claim 127, wherein emitting electromagnetic radiation comprises operating first and second electromagnetic radiation sources and wherein detecting the electromagnetic radiation striking the interlock device comprises distinguishing between electromagnetic radiation emitted by the first source from electromagnetic radiation emitted by the second source.
129. The method as set forth in claim 128, wherein enabling operation of the enteral feeding pump comprises enabling the enteral feeding pump to pump nutrient liquid in the feeding set in response to the detected electromagnetic radiation being emitted by the first source and not emitted by the second source.
130. The method as set forth in claim 128, wherein the electromagnetic radiation emitted by the first source comprises infrared radiation and the electromagnetic radiation emitted by the second source comprises visible light.
131. The method as set forth in claim 128 wherein the electromagnetic radiation emitted by the first source comprises infrared radiation and the electromagnetic radiation emitted by the second source comprises ambient light.
132. The method as set forth in claim 127, wherein emitting electromagnetic radiation comprises operating a first electromagnetic radiation source and wherein detecting the electromagnetic radiation striking the interlock device comprises operating a first electromagnetic radiation detector, and further comprising disabling operation of the enteral feeding pump in response to the first detector detecting electromagnetic radiation emitted by a source other than the first source.
133. The method as set forth in claim 127, wherein emitting electromagnetic radiation comprises operating a first electromagnetic radiation source intermittently to generate an alternating pattern of emitter activations and deactivations, said first source emitting electromagnetic radiation during the emitter activations and not emitting electromagnetic radiation during the emitter deactivations.
134. The method as set forth in claim 133, further comprising detecting electromagnetic radiation striking the interlock device during at least one of the emitter deactivations thereby indicating the interlock device is improperly inserted in the pump recess and disabling operation of the enteral feeding pump in response thereto.
135. A method as set forth in claim 127 further comprising attaching a conduit to the interlock device.
136. A method as set forth in claim 135 wherein the step of attaching a conduit to the interlock device comprises attaching a first end of the interlock device to a first conduit section and attaching a second end of the interlock device to a second conduit section.
137. A method for controlling a pumping apparatus capable of mounting a pump set having a safety interlock device thereon, the method comprising:
emitting electromagnetic radiation from a first source of electromagnetic radiation in a direction for striking said safety interlock device of the pump set;
activating a first electromagnetic radiation detector to detect electromagnetic radiation striking the first detector after said electromagnetic radiation has struck said safety interlock device;
emitting electromagnetic radiation from a second source of electromagnetic radiation in a direction for striking said safety interlock device of the pump set;
activating a second electromagnetic radiation detector to detect electromagnetic radiation striking the second detector; and controlling the pumping apparatus to operate for pumping fluid in the pump set only when electromagnetic radiation emitted from the first source is detected by the first detector and when the second detector does not detect electromagnetic radiation.
138. The method as set forth in claim 137 further comprising placing a safety interlock device in a position on the pumping apparatus wherein electromagnetic radiation from the first source strikes the safety interlock device and is directed by the safety interlock device to the first detector.
139. The method as set forth in claim 137 wherein emitting electromagnetic radiation from the first source comprises emitting infrared radiation and emitting electromagnetic radiation from the second source comprises emitting visible light.
140. The method as set forth in claim 137 wherein emitting electromagnetic radiation from the first source comprises operating said first source intermittently to generate a pattern of emitter activations wherein electromagnetic radiation is emitted from the first source.
141. The method as set forth in claim 140 wherein activating the first detector comprises operating the first detector intermittently in a series of detector activations to detect the presence of electromagnetic radiation from the first source.
142. The method as set forth in claim 141 wherein the number of activations of the radiation detector is greater than the number of activations of the radiation emitter.
143. The method as set forth in claim 141 wherein said detector activations and said emitter activations have a ratio of about 2:1.
144. The method as set forth in claim 137 wherein said step of emitting electromagnetic radiation from a second source occurs only after the first detector has detected electromagnetic radiation from the first source.
CA2579467A 2006-03-02 2007-02-20 Pump set with secure loading features Active CA2579467C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/366,225 US7758551B2 (en) 2006-03-02 2006-03-02 Pump set with secure loading features
US11/366,225 2006-03-02

Publications (2)

Publication Number Publication Date
CA2579467A1 CA2579467A1 (en) 2007-09-02
CA2579467C true CA2579467C (en) 2012-07-17

Family

ID=38169474

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2579467A Active CA2579467C (en) 2006-03-02 2007-02-20 Pump set with secure loading features

Country Status (18)

Country Link
US (1) US7758551B2 (en)
EP (2) EP2145639A1 (en)
JP (1) JP2007236934A (en)
KR (3) KR100904102B1 (en)
CN (1) CN101069760B (en)
AR (1) AR059721A1 (en)
AT (1) ATE447990T1 (en)
AU (2) AU2007200848B2 (en)
BR (1) BRPI0700626B8 (en)
CA (1) CA2579467C (en)
DE (1) DE602007003124D1 (en)
DK (1) DK1829573T3 (en)
ES (1) ES2336372T3 (en)
IL (1) IL181525A (en)
MX (1) MX2007002468A (en)
SG (1) SG135161A1 (en)
TW (1) TWI347204B (en)
ZA (1) ZA200701740B (en)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7846131B2 (en) 2005-09-30 2010-12-07 Covidien Ag Administration feeding set and flow control apparatus with secure loading features
US8021336B2 (en) 2007-01-05 2011-09-20 Tyco Healthcare Group Lp Pump set for administering fluid with secure loading features and manufacture of component therefor
US7758551B2 (en) 2006-03-02 2010-07-20 Covidien Ag Pump set with secure loading features
US7927304B2 (en) 2006-03-02 2011-04-19 Tyco Healthcare Group Lp Enteral feeding pump and feeding set therefor
US7722562B2 (en) 2006-03-02 2010-05-25 Tyco Healthcare Group Lp Pump set with safety interlock
US7722573B2 (en) 2006-03-02 2010-05-25 Covidien Ag Pumping apparatus with secure loading features
US7763005B2 (en) 2006-03-02 2010-07-27 Covidien Ag Method for using a pump set having secure loading features
US7560686B2 (en) * 2006-12-11 2009-07-14 Tyco Healthcare Group Lp Pump set and pump with electromagnetic radiation operated interlock
EP2253345B1 (en) * 2008-02-28 2012-10-17 JMS Co., Ltd. Injection device for semi-solidified nutritional supplement
MX2010013127A (en) 2008-05-30 2010-12-21 Nestec Sa Tube bracket for fluid apparatus.
US8154274B2 (en) * 2010-05-11 2012-04-10 Tyco Healthcare Group Lp Safety interlock
JP6243444B2 (en) 2012-12-21 2017-12-06 アルコン リサーチ, リミテッド Cassette clamp mechanism
DE102014009430A1 (en) * 2013-07-10 2015-01-15 Heidelberger Druckmaschinen Ag Peristaltic pump, pump hose and hose change process
US10080836B2 (en) 2014-01-23 2018-09-25 Zevex, Inc. Absorption-based optical sensor for detecting infusion pump cassette
USD743023S1 (en) * 2014-04-15 2015-11-10 Zevex, Inc. Enteral feeding pump interface
AU2019271195A1 (en) * 2018-05-15 2020-11-26 Baxter Healthcare Sa Infusion pump with tube loading guidance and confirmation
CA3123388A1 (en) 2018-06-29 2020-01-02 Generica Medical International, Inc. Enteral feeding systems and methods
EP3705148A1 (en) 2019-03-04 2020-09-09 Avoset Health Ltd. In cycle pressure measurement
EP3934716A1 (en) 2019-03-05 2022-01-12 Eitan Medical Ltd. Anti-free-flow valve
USD977093S1 (en) 2020-07-30 2023-01-31 Medline Industries, Lp Conduit
US11766552B2 (en) 2020-07-30 2023-09-26 Medline Industries, Lp Conduit connectors and fluid assemblies for enteral feed pumps, and methods thereof

Family Cites Families (166)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483924A (en) * 1946-06-10 1949-10-04 Moulinier Edmond Jean Pump
US3435209A (en) * 1966-03-10 1969-03-25 Beckman Instruments Inc Two wavelength infrared analyzer having a pair of variable interference filters for determining the respective wavelengths
US3432128A (en) 1967-04-13 1969-03-11 Walter J Elleboudt Channel assembly for flexible tubing,conductors,and the like
US3523179A (en) * 1969-03-27 1970-08-04 Monsanto Co Selective transmitter for infrared heaters
US3675653A (en) * 1969-08-15 1972-07-11 Air Shields Wound drainage equipment
US3693025A (en) * 1969-11-28 1972-09-19 Brun Sensor Systems Inc Apparatus and method for eliminating interference errors in dual-beam infrared reflection measurements on a diffusely reflecting surface by geometrical elimination of interference-producing specularly-reflected radiation components
US3673476A (en) * 1971-03-08 1972-06-27 Ford Motor Co Signal producing apparatus adaptable for use with variable reluctance motors
IT969233B (en) * 1972-01-26 1974-03-30 Meier J PROCEDURE FOR DETERMINING THE DISAPPEARANCE IN THE BEAMS AND OR TURBIDITY OF A MEANS OF APPARATUS FOR THE ACTION OF THE SAID PROCEDURE AND APPLICATION OF THE SAID PROCEDURE
FR2257118B1 (en) * 1974-01-04 1976-11-26 Commissariat Energie Atomique
US3985133A (en) 1974-05-28 1976-10-12 Imed Corporation IV pump
US3987303A (en) * 1975-02-06 1976-10-19 Hewlett-Packard Company Medical-analytical gas detector
US3993061A (en) 1975-02-28 1976-11-23 Ivac Corporation Syringe pump drive system and disposable syringe cartridge
US4126132A (en) 1975-07-28 1978-11-21 Andros Incorporated Intravenous and intra arterial delivery system
CA1152789A (en) 1979-11-30 1983-08-30 Naohiro Murayama Infrared condensing lenses
US4346296A (en) * 1980-08-15 1982-08-24 Andros Analyzers Incorporated Non-dispersive infrared gas analyzer
US4424011A (en) * 1980-12-22 1984-01-03 Triune Automated Painting Systems Painting applicator with remote supply
US4553541A (en) * 1981-03-23 1985-11-19 Becton, Dickinson And Co. Automatic retractable lancet assembly
JPS57190251A (en) * 1981-05-19 1982-11-22 Horiba Ltd Absorbance system analyzer
SE433783B (en) * 1982-03-03 1984-06-12 Pharos Ab OPTICAL SWEEPING DEVICE
US4944748A (en) * 1986-10-12 1990-07-31 Bramm Gunter W Magnetically suspended and rotated rotor
US5078741A (en) * 1986-10-12 1992-01-07 Life Extenders Corporation Magnetically suspended and rotated rotor
US4504263A (en) * 1982-12-22 1985-03-12 Valleylab, Inc. Flow rate monitor with optical sensing chamber
US4537561A (en) 1983-02-24 1985-08-27 Medical Technology, Ltd. Peristaltic infusion pump and disposable cassette for use therewith
DE3343186A1 (en) 1983-11-29 1985-06-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München MAGNETIC ROTOR BEARING
NL8400082A (en) 1984-01-10 1985-08-01 Wavin Bv METHOD AND APPARATUS FOR INJECTION MOLDING OF PVC PRODUCTS.
ES8500067A1 (en) 1984-01-19 1984-10-01 Intermedicat Gmbh Peristaltic hose pump for medical use
US4714463A (en) 1984-11-29 1987-12-22 Minnesota Mining And Manufacturing Company Sequence valve for piggyback IV administration with tube reversal prevention
US4652260A (en) 1985-03-11 1987-03-24 Strato Medical Corporation Infusion device
DE3536271A1 (en) 1985-10-11 1987-04-16 Dornier Medizintechnik POSITIONING DEVICE FOR AN ELECTRODE
EP0228217A1 (en) 1985-12-18 1987-07-08 LUCAS INDUSTRIES public limited company Liquid level detection
US4845489A (en) * 1985-12-23 1989-07-04 Chrysler Motors Corporation Electroluminescent display drive circuitry
US4665391A (en) * 1986-02-27 1987-05-12 Warner-Lambert Company Empty container detector
SE459641B (en) 1986-03-24 1989-07-24 Gambro Ab DETECTOR SYSTEM CONTROLS A BLOOD CIRCULATION ALTERNATIVE WITH A SIGNIFICANTLY UNLESSED
DE3627011A1 (en) 1986-08-09 1988-02-18 Huebner Karl Alexander Air trap for shutting off plastic tubes, especially infusion tubes
US4909797A (en) * 1987-01-16 1990-03-20 Sherwood Medical Company Enteral delivery set with shaded drip chamber
US4882575A (en) * 1987-01-28 1989-11-21 Sharp Kabushiki Kaisha Monitor for blocked condition in tube for fluid infusion pump
GB8708148D0 (en) 1987-04-06 1987-05-13 British Telecomm Radiation pulse generation
US5211626A (en) 1987-05-01 1993-05-18 Product Innovation Holdings Ltd. Medical infusion apparatus
US4845487A (en) 1987-07-20 1989-07-04 Frantz Medical Development Ltd. Pump system for enteral/parenteral fluid control and delivery
US4850807A (en) 1987-06-16 1989-07-25 Frantz Medical Development Ltd. Disposable cassette for fluid delivery pump systems
US5237309A (en) * 1987-07-20 1993-08-17 Frantz Medical Development, Ltd. Pump cassette and method of pumping
US4753032A (en) * 1987-07-28 1988-06-28 Sherman Daniel A Contact poison delivery system
GB2209105A (en) * 1987-08-26 1989-04-26 Philips Nv Infra-red receiver
US5201711A (en) 1987-09-30 1993-04-13 Sherwood Medical Company Safety interlock system for medical fluid pumps
US4913703A (en) * 1987-09-30 1990-04-03 Sherwood Medical Company Safety interlock system for medical fluid pumps
US4878896A (en) 1987-12-01 1989-11-07 Pacesetter Infusion, Ltd. Cassette optical identification apparatus for a medication infusion system
US4884013A (en) * 1988-01-15 1989-11-28 Sherwood Medical Company Motor unit for a fluid pump and method of operation
US4950235A (en) 1988-05-10 1990-08-21 Pacesetter Infusion, Ltd. Container-side occlusion detection system for a medication infusion system
US4976590A (en) 1988-06-08 1990-12-11 Baldwin Brian E Fluid conduit-responsively adjustable pump arrangement and pump/conduit arrangement and method, and fluid conduits therefor
US4884065A (en) 1988-06-13 1989-11-28 Pacesetter Infusion, Ltd. Monitor for detecting tube position and air bubbles in tube
US4945244A (en) * 1988-12-23 1990-07-31 Castleman Robert D Electronic infrared detector
DE3910250A1 (en) 1989-03-30 1990-10-11 Fresenius Ag Photoelectric monitoring arrangement for hose lines in medical technology
SE467378B (en) * 1989-08-23 1992-07-06 Rolf Eric Ragnar Stroemberg INITIATION STABILIZATION SYSTEM CARRIES ONE INSTRUMENT
US5158437A (en) * 1990-03-15 1992-10-27 Abbott Laboratories Volumetric pump with spring-biased cracking valves
US5057081A (en) 1990-06-15 1991-10-15 Sherwood Medical Company Peristaltic infusion device
US5181842A (en) 1990-06-15 1993-01-26 Sherwood Medical Company Peristaltic infusion device
US5436455A (en) * 1990-06-27 1995-07-25 Futrex Inc. Non-invasive near-infrared quantitative measurement instrument
IT1240404B (en) 1990-07-17 1993-12-10 Hospal Dasco Spa APPARATUS FOR DETECTING THE PRESENCE OF A TUBE AND / OR THE PRESENCE OF BLOOD INSIDE IT
AU658845B2 (en) 1990-08-20 1995-05-04 Abbott Laboratories Medical drug formulation and delivery system
US5502111A (en) * 1991-03-06 1996-03-26 E. I. Du Pont De Nemours And Company Process for making polyvinyl chloride compositions having high heat distortion temperatures
US5415641A (en) * 1991-04-01 1995-05-16 Sherwood Medical Company Drop detection method and apparatus
US5256155A (en) * 1991-04-01 1993-10-26 Sherwood Medical Company Drop detection method and apparatus
US5250027A (en) * 1991-10-08 1993-10-05 Sherwood Medical Company Peristaltic infusion device with backpack sensor
US5207645A (en) 1991-06-25 1993-05-04 Medication Delivery Devices Infusion pump, treatment fluid bag therefor, and method for the use thereof
US5290239A (en) 1991-09-26 1994-03-01 Baxter International, Inc. Intravenous tube safety apparatus
CA2512707C (en) 1992-03-27 2009-05-12 Abbott Laboratories Automatic closure of containers
DE69333230T2 (en) 1992-03-27 2004-08-05 Abbott Laboratories, Abbott Park AUTOMATIC ANALYSIS SYSTEM WITH PERMANENT AND OPTIONAL ACCESS AND COMPONENTS FOR IT
US5437635A (en) 1992-05-06 1995-08-01 Mcgaw, Inc. Tube flow limiter, safety flow clip, and tube pincher mechanism
US5336174A (en) 1992-05-07 1994-08-09 Ivac Corporation Flow control valve
US5569026A (en) 1992-06-18 1996-10-29 Storz Endoskop Gmbh Tube pump in which tube can be inserted only in one direction
US5383858B1 (en) 1992-08-17 1996-10-29 Medrad Inc Front-loading medical injector and syringe for use therewith
US5357113A (en) * 1992-11-18 1994-10-18 Liston Scientific Corp. Infrared gas mixture analyzer
US5330431A (en) * 1993-03-12 1994-07-19 Glenn Herskowitz Infusion pump
DE4310855C2 (en) * 1993-04-02 1995-04-27 Josef Dr Klimm Device for monitoring at least one connection between two elements of a medical hose line system
US5364364A (en) * 1993-08-04 1994-11-15 Ivac Corporation Automatic flow control valve system
EP0720747B1 (en) 1993-09-24 2002-07-17 Abbott Laboratories Automated continuous and random access analytical system and components thereof
US5531697A (en) 1994-04-15 1996-07-02 Sims Deltec, Inc. Systems and methods for cassette identification for drug pumps
US5433588A (en) * 1993-12-15 1995-07-18 Stryker Corporation Peristaltic pump with one piece tubing insert and one piece cover
US5560355A (en) * 1993-12-17 1996-10-01 Nellcor Puritan Bennett Incorporated Medical sensor with amplitude independent output
US5536935A (en) * 1994-02-17 1996-07-16 Thermedics Detection, Inc. Detection of foaming contaminants in containers using image processing
US5575284A (en) 1994-04-01 1996-11-19 University Of South Florida Portable pulse oximeter
US6786879B1 (en) * 1994-04-05 2004-09-07 Kci Licensing, Inc. Gradient sequential compression system for preventing deep vein thrombosis
AU3271895A (en) 1994-08-01 1996-03-04 Abbott Laboratories Method and apparatus for performing automated analysis
US5567120A (en) * 1994-10-13 1996-10-22 Sigma International Electronic infusion device and novel roller clamp holden therefor
US5681284A (en) 1994-10-31 1997-10-28 Glenn Herskowitz Infusion pump with tube spike holder
US5584671A (en) 1994-11-28 1996-12-17 Sherwood Medical Company Apparatus for delivering fluid to a patient
US5508521A (en) * 1994-12-05 1996-04-16 Cardiovascular Diagnostics Inc. Method and apparatus for detecting liquid presence on a reflecting surface using modulated light
US5634907A (en) * 1994-12-22 1997-06-03 Sandoz Nutrition Ltd. System for detection of fluid infusion
US5586567A (en) 1995-01-10 1996-12-24 General Electric Company Dishwasher with turbidity sensing mechanism
US5828458A (en) * 1995-01-26 1998-10-27 Nartron Corporation Turbidity sensor
US5683367A (en) * 1995-03-06 1997-11-04 Sabratek Corporation Infusion pump with different operating modes
US5620312A (en) * 1995-03-06 1997-04-15 Sabratek Corporation Infusion pump with dual-latching mechanism
US5704912A (en) 1995-03-17 1998-01-06 Advanced Cardiovascular Systems, Inc. Syringe assembly mounting system for inflation control system
US5721430A (en) * 1995-04-13 1998-02-24 Engelhard Sensor Technologies Inc. Passive and active infrared analysis gas sensors and applicable multichannel detector assembles
US6099502A (en) * 1995-04-20 2000-08-08 Acist Medical Systems, Inc. Dual port syringe
US5531680A (en) 1995-05-05 1996-07-02 Zevex, Inc. Enteral feeding pump motor unit and method of use
FI97446C (en) 1995-05-12 1996-12-27 Instrumentarium Oy Arrangement for leak testing with a fan
US5602664A (en) * 1995-06-06 1997-02-11 Thomson Consumer Electronics, Inc. Infrared repeater
US5711654A (en) * 1995-06-07 1998-01-27 Baxter International Inc. Peristaltic pump with rotor position sensing employing a reflective object sensor
US5623907A (en) 1995-06-09 1997-04-29 Walbro Corporation Liquid propane fuel delivery system
WO1997002059A1 (en) 1995-07-06 1997-01-23 Disetronic Licensing Ag Disposable cassette for connection to a liquid drug infusion pump
US6023970A (en) 1995-08-04 2000-02-15 Blaine; David H. Disposable electromagnetic fluid sensor
US5789675A (en) 1995-08-04 1998-08-04 Zevex, Inc. Disposable electromagnetic fluid level sensor
GB9518100D0 (en) * 1995-09-05 1995-11-08 Infrared Eng Calibration standard for infrared absorption gauge
JP3537145B2 (en) 1995-10-20 2004-06-14 ハーヴェスト テクノロジーズ コーポレーション Filter bag and connection cartridge
US5851631A (en) 1995-12-08 1998-12-22 Raytheon Company Composite infrared windows using silicon and plastic
US5788674A (en) 1996-03-05 1998-08-04 Medication Delivery Devices, Inc. Apparatus and method for limiting free-flow in an infusion system
DE19611290C2 (en) * 1996-03-22 1998-04-16 Draegerwerk Ag Gas sensor
GB9607471D0 (en) 1996-04-10 1996-06-12 Baxter Int Volumetric infusion pump
GB9610700D0 (en) * 1996-05-22 1996-07-31 Moor Instr Ltd Apparatus for imaging microvascular blood flow
US5903006A (en) * 1996-05-31 1999-05-11 Norihiro Kiuchi Liquid concentration detecting apparatus
US6244835B1 (en) * 1996-06-26 2001-06-12 James F. Antaki Blood pump having a magnetically suspended rotor
US6015272A (en) * 1996-06-26 2000-01-18 University Of Pittsburgh Magnetically suspended miniature fluid pump and method of designing the same
US5853386A (en) 1996-07-25 1998-12-29 Alaris Medical Systems, Inc. Infusion device with disposable elements
KR20000036228A (en) * 1996-09-23 2000-06-26 노보스트 코포레이션 Intraluminal radiation treatment system
US5752813A (en) 1996-10-23 1998-05-19 A.Z.E. Medical Inc. Keyed cassette for dispensing pump
US6129699A (en) * 1997-10-31 2000-10-10 Sorenson Development, Inc. Portable persistaltic pump for peritoneal dialysis
IL119562A (en) 1996-11-04 2003-12-10 Oridion Medical Ltd Fluid analyzer with tube connector verifier
US5830137A (en) 1996-11-18 1998-11-03 University Of South Florida Green light pulse oximeter
US5920018A (en) * 1996-12-11 1999-07-06 The University Of Tennessee Research Corporation Real time volumetric flow sensor
US5798699A (en) * 1997-01-06 1998-08-25 Chemtrac Systems, Inc. Method for monitoring and selectively sampling a fluid flow stream
US5818049A (en) * 1997-08-29 1998-10-06 Ohmeda Inc. Infrared gas spectrometer having a lid assembly with an integrated chopper and chopper motor
US6468242B1 (en) 1998-03-06 2002-10-22 Baxter International Inc. Medical apparatus with patient data recording
JP3423633B2 (en) * 1998-07-02 2003-07-07 株式会社ジェイ・エム・エス Infusion pump device
US6095986A (en) * 1998-07-28 2000-08-01 Square One Technology, Inc. Disposable anti-fog airway adapter
US6117115A (en) * 1998-10-12 2000-09-12 B. Braun Medical, Inc. Medical tubing slide clamp device for determining proper tubing size and functional characteristics
US6585684B1 (en) * 1998-12-22 2003-07-01 Novoste Corporation Automated system for the radiation treatment of a desired area within the body of a patient
US6067463A (en) 1999-01-05 2000-05-23 Abbott Laboratories Method and apparatus for non-invasively measuring the amount of glucose in blood
US6390590B1 (en) * 1999-01-21 2002-05-21 Oki Data Americas, Inc. Apparatus for recording information about an ink cartridge
US6162183A (en) 1999-02-02 2000-12-19 J&J Engineering Respiration feedback monitor system
GB2349431B (en) 1999-04-29 2002-06-12 Watson Marlow Ltd Peristaltic pumps
US6227817B1 (en) * 1999-09-03 2001-05-08 Magnetic Moments, Llc Magnetically-suspended centrifugal blood pump
US6958053B1 (en) 1999-11-24 2005-10-25 Medrad, Inc. Injector providing drive member advancement and engagement with syringe plunger, and method of connecting a syringe to an injector
US6219138B1 (en) * 2000-01-10 2001-04-17 The United States Of America As Represented By The Secretary Of The Navy Particle sizing technique
WO2001063249A1 (en) * 2000-02-28 2001-08-30 Atsuo Watanabe Interference filter transmission wavelength scanning photometer
US6626862B1 (en) 2000-04-04 2003-09-30 Acist Medical Systems, Inc. Fluid management and component detection system
US6461323B2 (en) * 2000-05-03 2002-10-08 Reginald H. Fowler Surgical system pump with flow sensor and method therefor
AUPQ867900A0 (en) 2000-07-10 2000-08-03 Medrad, Inc. Medical injector system
US20020036276A1 (en) * 2000-08-07 2002-03-28 Seeman Daniel J. Method and apparatus for monitoring the characteristics of a fluid
WO2002024252A2 (en) 2000-09-22 2002-03-28 C.R. Bard, Inc. Surgical irrigation system
US6528791B1 (en) * 2000-10-13 2003-03-04 Andros Incorporated Infrared spectrophotometer employing sweep diffraction grating
DE20019210U1 (en) * 2000-11-11 2001-01-25 Schott Glas Cooktop
US7018363B2 (en) * 2001-01-18 2006-03-28 Medrad, Inc. Encoding and sensing of syringe information
US6659976B2 (en) 2001-04-16 2003-12-09 Zevek, Inc. Feeding set adaptor
US6531708B1 (en) 2001-04-16 2003-03-11 Zevex, Inc. Optical bubble detection system
US6890291B2 (en) * 2001-06-25 2005-05-10 Mission Medical, Inc. Integrated automatic blood collection and processing unit
US6683679B2 (en) * 2002-05-23 2004-01-27 Trex Enterprises Corporation Optical flow monitor
US7041082B2 (en) 2002-02-28 2006-05-09 Smiths Medical Md, Inc. Syringe pump control systems and methods
US6617175B1 (en) * 2002-05-08 2003-09-09 Advanced Technology Materials, Inc. Infrared thermopile detector system for semiconductor process monitoring and control
US20040036273A1 (en) * 2002-08-20 2004-02-26 Mcclary Charles R. Methods and apparatus for determining integrity of interconnections
US6949066B2 (en) * 2002-08-21 2005-09-27 World Heart Corporation Rotary blood pump diagnostics and cardiac output controller
US7537579B2 (en) 2002-09-26 2009-05-26 Covidien Ag Safety interlock system for an enteral feeding pump
JP2006500154A (en) 2002-09-26 2006-01-05 シャーウッド・サービシーズ・アクチェンゲゼルシャフト Enteral nutrition system and administration nutrition set
US20050267401A1 (en) 2004-05-25 2005-12-01 Sherwood Services, Ag. Safety interlock system for an enteral feeding pump
US7144384B2 (en) 2002-09-30 2006-12-05 Insulet Corporation Dispenser components and methods for patient infusion device
US6891343B2 (en) * 2003-03-14 2005-05-10 Petersen Technology Corporation Multiphase motors with single point sensing based commutation
US7258534B2 (en) * 2003-09-22 2007-08-21 Hospira, Inc. Fluid delivery device identification and loading system
US7092796B2 (en) * 2003-11-14 2006-08-15 Cardinal Health 303, Inc. System and method for verifying connection of correct fluid supply to an infusion pump
US20050186377A1 (en) * 2004-02-19 2005-08-25 Hurst William S. Solventless plastic bonding of medical devices and container components through infrared heating
US7608059B2 (en) 2004-05-25 2009-10-27 Covidien Ag Flow control apparatus
US7462170B2 (en) * 2004-05-25 2008-12-09 Covidien Ag Administration feeding set and valve mechanism
JP4575052B2 (en) * 2004-07-07 2010-11-04 オリンパス株式会社 Multilayer negative filter and fluorescence microscope
JP4679929B2 (en) 2005-02-24 2011-05-11 テクノポリマー株式会社 Infrared transparent thermoplastic resin composition and molded article using the same
US7722562B2 (en) * 2006-03-02 2010-05-25 Tyco Healthcare Group Lp Pump set with safety interlock
US7927304B2 (en) 2006-03-02 2011-04-19 Tyco Healthcare Group Lp Enteral feeding pump and feeding set therefor
US7758551B2 (en) 2006-03-02 2010-07-20 Covidien Ag Pump set with secure loading features

Also Published As

Publication number Publication date
AU2010200409B2 (en) 2013-01-17
BRPI0700626A (en) 2007-11-06
EP2145639A1 (en) 2010-01-20
KR20080046622A (en) 2008-05-27
TW200800316A (en) 2008-01-01
EP1829573A1 (en) 2007-09-05
AR059721A1 (en) 2008-04-23
ZA200701740B (en) 2008-06-25
US7758551B2 (en) 2010-07-20
CA2579467A1 (en) 2007-09-02
SG135161A1 (en) 2007-09-28
BRPI0700626B1 (en) 2019-06-04
BRPI0700626A8 (en) 2018-02-06
KR20070090774A (en) 2007-09-06
CN101069760A (en) 2007-11-14
MX2007002468A (en) 2008-11-14
US20070208305A1 (en) 2007-09-06
IL181525A (en) 2011-05-31
AU2007200848B2 (en) 2010-06-24
KR20080046623A (en) 2008-05-27
KR100904104B1 (en) 2009-06-24
KR100904102B1 (en) 2009-06-24
DE602007003124D1 (en) 2009-12-24
DK1829573T3 (en) 2010-03-08
EP1829573B1 (en) 2009-11-11
CN101069760B (en) 2011-05-11
TWI347204B (en) 2011-08-21
AU2007200848A1 (en) 2007-09-20
KR100904103B1 (en) 2009-06-24
ATE447990T1 (en) 2009-11-15
JP2007236934A (en) 2007-09-20
ES2336372T3 (en) 2010-04-12
IL181525A0 (en) 2007-07-04
AU2010200409A1 (en) 2010-02-25
BRPI0700626B8 (en) 2021-06-22

Similar Documents

Publication Publication Date Title
CA2579467C (en) Pump set with secure loading features
EP1829575B1 (en) Enternal feeding pump and feeding set therefor
AU2007200875B2 (en) Pumping apparatus with secure loading features
EP1829572B1 (en) Method for using a pump set having secure loading features
CA2616227C (en) Pump set for administering fluid with secure loading features and manufacture of component therefor
US8142399B2 (en) Pump set with safety interlock

Legal Events

Date Code Title Description
EEER Examination request