CA2176429A1 - In vivo rezero apparatus for a pressure transducer - Google Patents
In vivo rezero apparatus for a pressure transducerInfo
- Publication number
- CA2176429A1 CA2176429A1 CA002176429A CA2176429A CA2176429A1 CA 2176429 A1 CA2176429 A1 CA 2176429A1 CA 002176429 A CA002176429 A CA 002176429A CA 2176429 A CA2176429 A CA 2176429A CA 2176429 A1 CA2176429 A1 CA 2176429A1
- Authority
- CA
- Canada
- Prior art keywords
- opening
- pressure transducer
- lumen
- seal
- rezero
- 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.)
- Abandoned
Links
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/03—Detecting, measuring or recording fluid pressure within the body other than blood pressure, e.g. cerebral pressure; Measuring pressure in body tissues or organs
- A61B5/031—Intracranial pressure
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/0215—Measuring pressure in heart or blood vessels by means inserted into the body
- A61B5/02156—Calibration means
Abstract
An in vivo rezero apparatus for a pressure transducer is disclosed. This invention includes embodiments where both sides of the pressure transducer are exposed to atmospheric pressure to rezero the pressure transducer and embodiments where both sides of the pressure transducer are exposed to physiologic pressure to rezero the pressure transducer.
Description
2 1 7 ~
PATENT APPLICATION
IN VIVO REZERO APPARATUS FOR A PRESSURE TRANSDUCER
Back~round of the Invention This invention relates to an apparatus that can rezero a pressure transducer in vivo.
Pressure transducers are used to monitor various patient pressures in multiple sites within the body. For example, pressure monitoring is used for hemodynamic monitoring to assess the cardio-pulmonary status of a critically ill patient. Another application where pressure monitoring is important is in patients who have experienced severe head trauma. In these head injured patients intracranial pressure (ICP) can rise due to tissue swelling or internalbleeding. Early diagnosis and treatment of brain swelling are critical to prevent secondary brain injury due to tissue ischemia.
Currently, the continuous measurement of physiologic pressures is performed using external pressure transducers. These ex vivo transducers are mounted near the patient and are connected to various physiologic locations via fluid filled tubing and catheters. Because of the inherent elasticity of the fluid filled tubing, the possibility of fluid leaks, leveling issues, and air bubbles entering the system, the external transducer system is a source of significant pressure and waveform inaccuracy. Infection is also a risk with fluid-coupled systems.
Pressure monitoring systems using an in vivo pressure transducer have solved some of these problems. However, in vivo pressure transducers suffer a unique problem not shared by external transducers. Pressure transducers that function with existing hospital monitors, both in vivo and ex vivo, supply a known or common output for a given change in pressure. Due to individual differences between transducers, each device must be zero referenced after connection to the hospital monitor. This is accomplished by exposing the pressure transducer to atmospheric pressure and then zeroing the monitor.
The monitor retains this transducer response as zero pressure. Additionally, 5 as a patient is transported throughout the hospital for diagnosis and/or treatment the pressure transducer is routinely disconnected from one monitor and connected to another at a remote location. Each time a pressure transducer is connected to a dirrerent monitor a new zero baseline must be established on that monitor. Extemal transducers are located ex vivo and can 10 be easily rezeroed by venting both sides of the transducer to atmospheric pressure. An in vivo pressure transducer, however, cannot be removed from the patient to vent both sides of the transducer to atmospheric pressure and to re-establish this zero baseline. Attempting to do so would expose the patient to an unacceptable risk of infection.
Thus there is a need for a device that will repeatably rezero an in vivo pressure transducer in vivo.
Summarv of the Invention It is therefore an object of this invention to provide a device that will 20 allow an in vivo pressure transducer to be rezeroed in vivo.
The in vivo rezero apparatus of this invention is comprised of a tip assembly that houses the pressure transducer and a portion of the rezero apparatus, a proximal actuator assembly that allows switching between measure and rezero modes, and a tube that connects the tip assembly to the 25 proximal actuator assembly. In use, the tip assembly of the device is placed 21 76~29 in the medium to be measured while the proximal actuator assembly resides ex vivo for connection to pressure monitoring equipment.
The tip assembly includes two lumens therein. It can have a bilumen configuration. Preferably the tip assembly is formed from a tube within a 5 sleeve to create the two lumen configuration. The tube is assembled eccentrically within the sleeve such that a portion of the tube abuts a portion of the sleeve. This arrangement ensures that the tip assembly has two distinct lumens. The distal end of the tube is open while the distal end of the sleeve surrounding the tube is closed. A pressure transducer is fixed to the 10 tube in the lumen created between the tube and sleeve. A movable seal assembly is located within the lumen of the tube.
In one embodiment of the tip assembly the tube has a first opening and a second opening through its wall so the two lumens are in fluid communication with one another. The pressure transducer is located over the 15 first opening which is prererably closer to the distal end of the tip assembly than the second opening. A third opening is located through the walls of both the tube and the sleeve at a location where these walls are in abutting relationship. This third opening places the interior of the tube in communication with the exterior of the tip assembly. The third opening is 20 distal to the first opening in the tube. In this embodiment only one side of the pressure transducer is ever exposed to physiological pressure.
In the pressure measurement mode, the movable seal assembly is positioned to allow physiologic pressure communication between the first opening in the tube and the third opening to the exterior of the tip assembly.
25 Atmospheric pressure is routed from the proximal end of the device through the tube to the backside of the pressure transducer via the second opening.
2~ 764~9 Physiologic pressure is transmitted through the third opening to the first opening under the pressure transducer. In this way the pressure transducer can measure physiologic pressure by using atmospheric pressure as a reference. By using an atmospheric pressure reference, the transducer is not 5 affected by changes in barometric pressure.
When the seal assembly is positioned in the rezero mode it allows communication between the first opening under the pressure transducer through the tube to an atmospheric vent through the proximal end of the device. Atmospheric pressure is also routed from the proximal end of the 10 device to the backside of the pressure transducer via the second opening.
Thus, both sides of the pressure transducer are exposed to atmospheric pressure.
In the second embodiment of the tip assembly, the wall of the sleeve has a sidehole adjacent to the pressure transducer exposing one side of the 15 pressure transducer to physiologic pressure. When the seal assembly is positioned in the measure mode it allows communication between the other side of the pressure transducer through the tube to an atmospheric vent through the proximal end of the device. In this situation, the pressure transducer is able to measure physiologic pressure. When the seal assembly 20 is positioned in the rezero mode it allows communication between the exteriorof the tip assembly through the third opening and to the other side of the pressure transducer through the first opening via the tube. In this position, both sides of the pressure transducer are exposed to physiologic pressure.
Since the pressure transducer is a differential pressure device, this condition 25 is equivalent to exposing both sides of the pressure transducer to atmospheric pressure. In this embodiment, there is no need for the second opening formed in the wall of the tube.
In the third embodiment of the tip assembly, there is no third opening nor any sidehole adjacent to the pressure transducer. In the measure mode, 5 one side of the pressure transducer is exposed to physiologic pressure via thefirst opening and the open distal end of the tube. The other side of the pressure transducer is vented to atmospheric pressure through the second opening and through the proximal end of the device via the tube. In the rezero mode, both sides of the pressure transducer are vented to atmospheric 10 pressure through the proximal end of the device.
In the fourth embodiment of the tip assembly, there is no second opening nor any third opening in the tube wall. However, the wall of the sleeve has a sidehole adjacent to the pressure transducer to expose one side of the pressure transducer to physiologic pressure. In the measure mode, the 15 one side of the pressure transducer is exposed to physiologic pressure via the sidehole in the sleeve and the other side is vented to atmospheric pressure through the first opening to the proximal end of the device via the tube. In therezero mode, the one side of the pressure transducer is still exposed to physiologic pressure via the sidehole in the sleeve, while the other side is 20 also exposed to physiologic pressure via the first opening and the open distal end of the tube. This condition is equivalent to exposing both sides of the pressure transducer to atmospheric pressure.
The proximal actuator assembly used in connection with each of the four embodiments includes a mechanism for controlling the movement of the 25 seal assembly. The seal assembly is connected to an actuator rod that extends through the tube. The actuator rod is biased in the proximal direction by a spring located in the housing for the proximal actuator assembly. A cam device connected to a rotating knob in the proximal actuator assembly is used to move the actuator rod against the bias of the spring in the distal direction.In this way, the seal assembly can be moved between its measure mode position and its rezero mode position.
Brief DescriPtion of the Drawin~s The above and other objects and advantages of the invention will be apparent upon consideration of the following drawings and detailed description. The preferred embodi- ments of the present invention are illustrated in the appended drawings in which like reference numbers refer to like elements and in which:
FIG. 1 is a perspective view of the in vivo rezero apparatus for a pressure transducer of this invention;
FIG. 2 is a side elevation view in cross-section of a first embodiment of the tip assembly with the rezero apparatus in the measure mode;
FIG. 3 is a view similar to the view shown in FIG. 2 but with the rezero apparatus in the rezero mode;
FIG. 4 is an end view of the tip assembly;
FIG. 5 is a side elevation view in cross-section of a second embodiment of the tip assembly with the rezero apparatus in the measure mode;
FIG. 6 is a view similar to the view shown in FIG. 5 but with the rezero apparatus in the rezero mode;
FIG. 7 is a side elevation view in cross-section of a third embodiment of the tip assembly with the rezero apparatus in the measure mode;
21 7642~
FIG. 8 is a view similar to the view shown in FIG. 7 but with the rezero apparatus in the rezero mode;
FIG. 9 is a side elevation view in cross-section of a fourth embodiment of the tip assembly with the rezero apparatus in the rezero mode;
FIG. 10 is a view similar to the view shown in FIG. 9 but with the rezero apparatus in the measure mode; and FIG. 11 is a top plan view partially in section of the proximal actuator assembly for the rezero apparatus of this invention.
Detailed DescriPtion of the Invention The in vivo rezero apparatus for a pressure transducer of this invention includes a tip assembly 10, a proximal actuator assembly 50 and a tube 90 that connects tip assembly 10 with proximal actuator assembly 50.
The pressure transducer 20 used in this device is a solid-state, silicon device employing a Wheatstone Bridge circuit configuration. It is a differentialpressure device. The difference between the pressure seen at one side of pressure transducer 20 and that seen at the other side is used to determine the pressure in the environment being monitored. Atmospheric pressure is typically used as the reference for physiologic pressure measurements. Thus, one side of pressure transducer 20 must be exposed to physiologic pressure while the other side is vented to atmospheric pressure. In order to rezero pressure transducer 20, both sides of pressure transducer 20 must be exposed to atmospheric pressure or, because it is a differential pressure device, to the same pressure.
Tip assembly 10, which houses pressure transducer 20, has two lumens therein. It can have a bilumen configuration. Preferably tip assembly 2 1 7642q 10 is formed from a tube 11 within a sieeve 15. Tube 1 1 and sleeve 15 are non-concentric and preferably tube 11 abuts sleeve 15 as shown in FIG. 4.
Tube 11 defines a lumen 12, which preferably has a circular cross-section.
Tube 11 is preferably formed from ceramic, metal or polymer and is chosen 5 for its structural as well as its non-magnetic properties. Sleeve 15 is a polymer extrusion or non-magnetic alloy and is adhered to tube 11 with an adhesive. Preferably silicone adhesive is used. The adhesive is applied between tube 1 1 and sleeve 15 to form a distal wall 16 that occludes the distalend of the lumen 19 formed between tube 11 and sleeve 15.
An opening 14 is located in tube 11 placing lumen 19 and lumen 12 in communication. Pressure transducer 20 is located over opening 14 and is fixed to tube 11 with an adhesive. Preferably silicone adhesive is used.
Another opening 17, distal to first opening 14, extends through tube 1 1 and sleeve 15 at a location where tube 11 and sleeve 15 are in abutting 15 relationship so that lumen 12 is in communication with the exterior of sleeve15. Physiologic pressure is communicated through opening 17 into lumen 12 and through opening 14 to one side of transducer 20.
In one embodiment of this invention, shown in FIGS. 2 and 3, only one side of pressure transducer 20 is ever exposed to physiologic pressure. This 20 pressure path is explained above. The other side of pressure transducer 20 isalways exposed to atmospheric pressure via lumen 19 between sleeve 15 and tube 11. Lumen 19 is vented to atmospheric pressure through a second opening 18 formed in tube 11 into lumen 12. Lumen 12 communicates with lumen 91 of tube 90 through adapter tube 96. Adapter tube 96 is bonded to tube 1 1 and tube 90 to attach tip assembly 10 to tube 90. The atmospheric 21 7~42q pressure path continues proximally through lumen 91 of catheter 90 and out through opening 59 in ~Gtll~tor assembly 50.
A movable seal assembly 30 located in lumen 12 is used to expose one side of pressure transducer 20 to either atmospheric pressure or physiologic 5 pressure. The seal assembly 30 includes two seals 31, 32 formed from a rigid tube made from a non-magnetic alloy or polymer, with a coating of silicone over the outer diameter. The silicone material is applied in an even thickness to form an interference seal with lumen 12 of tube 11. Two seals 31, 32 are attached to actuator rod 33 at a fixed distance by an epoxy or other adhesive.
In the measure mode, see FIG. 2, seal assembly 30 is positioned such that distal seal 31 is distal of opening 17 and proximal seal 32 is between opening 14 and opening 18. Thus, opening 14 and opening 17 are in communication and provide an unobstructed path for the physiologic pressure to reach pressure transducer 20. The pressure path is through opening 17, lumen 12 and opening 14. In the rezero mode, see FIG. 3, seal assembly 30 is moved distally so distal seal 31 is still distal of opening 17 but proximal seal 32 is between opening 17 and opening 14. In this position, both sides of pressure transducer 20 are exposed to atmospheric pressure. One side of pressure transducer 20 is vented to atmospheric pressure via lumen 19, opening 18, lumen 12, and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50. The other side of pressure transducer 20 is vented to atmospheric pressure via opening 14, lumen 12, and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50.
In a second embodiment, both sides of pressure transducer 20 can be exposed to physiologic pressure. See FIGS. 5 and 6. In this embodiment, a sidehole 26 is formed in the wall of sleeve 15 over pressure transducer 20 to 2 1 7642q expose one side of pressure trans- ducer 20 to physiologic pressure. In the measure mode, see FIG. 5, seal assembly 30 is positioned such that distal seal 31 is distal to opening 17 and proximal seal 32 is between opening 17 and opening 14. In this position, the other side of pressure transducer 20 is 5 vented to atmosphere via opening 14, lumen 12 and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50. The one side of pressure transducer 20 is exposed to physiologic pressure via sidehole 26. In the rezero mode, see FIG. 6, seal assembly 30 is moved proximally so distal seal 31 is still distal of opening 17 but proximal seal 32 is proximal of opening 14.10 The one side of pressure transducer 20 is still exposed to physiologic pressure via sidehole 26, while the other side of pressure transducer 20 is exposed to physiologic pressure via opening 17, lumen 12 and opening 14.
Since pressure transducer 20 is a differential pressure device, this condition is equivalent to exposing both sides of pressure transducer 20 to atmospheric 15 pressure. Although this embodiment is shown in FIGS. 5 and 6 with opening 18, it is to be understood that opening 18 is not necessary to its operation.
In a third embodiment of this invention, seal assembly 30 uses a single seal 31 movable within lumen 12. See FIGS. 7 and 8. In the measure mode, see FIG. 7, seal 31 is proximal to opening 14 and distal to opening 18. In this 20 mode, the one side of pressure transducer 20 is exposed to atmospheric pressure via lumen 19, opening 18, lumen 12 and lumen 91 to opening 59 in actuator assembly 50. The other side of pressure transducer 20 is exposed to physiologic pressure via opening 14 and lumen 12 through the open distal end of tube 11. In the rezero mode, see FIG. 8, seal 31 is distal to opening 25 14. In this mode, the one side of pressure transducer 20 is exposed to atmospheric pressure as already discussed in connection with the measure mode of this embodiment and the other side of pressure transducer 20 is also exposed to atmospheric pressure via opening 14, lumen 12 and lumen 91 to opening 59 in actuator assembly 50.
The fourth embodiment of this invention is similar to the third 5 embodiment except that sidehole 26 in sleeve 15 exposes pressure transducer 20 to physiologic pressure. See FIGS. 9 and 10. In the measure mode, see FIG.10, seal 31 is distal of opening 14. In this mode, the one side of pressure transducer 20 is exposed to physiologic pressure via sidehole 26 and the other side of pressure transducer 20 is exposed to atmospheric pressure via opening 14, lumen 12 and lumen 91 to opening 59 in actuator assembly 50. In the rezero mode, see FIG. 9, seal 31 is moved proximal to opening 14. In this mode, the one side of pressure transducer 20 is still exposed to physiologic pressure as discussed above. However, the other side of pressure transducer 20 is also exposed to physiologic pressure via opening 14, lumen 12 and the open distal end of tube 11. Since pressure transducer 20 is a differential pressure device, this condition is equivalent toexposing both sides of pressure transducer 20 to atmospheric pressure.
In all the described embodiments, tip assembly 10 is connected to the distal end of tube 90. Tube 90 is preferably formed from a silicone elastomer and defines a single lumen 91 therethrough. Adapter tube 96 extends proximally of tip assembly 10 and is bonded within lumen 91 of tube 90.
Preferably a silicone adhesive is used. Adapter tube 96 is preferably formed from a non-magnetic alloy. Lumen 91 houses actuator rod 36, actuator sleeve 35, carrier tube 95 and provides an atmospheric pressure path from tip assembly 10 to actuator assembly 50. Carrier tube 95 is preferably a polymer extrusion and carries conductor wires (not shown) from pressure transducer 21 764~9 20 to the proximal end of the device for connection to a standard hospital monitor (not shown). Actuator sleeve 35 is preferably a wound non-magnetic alloy and houses actuator rod 36. Actuator rod 36 is prererdbly formed from a highly elastic non-magnetic alloy and is attached to seal assembly 30 at its 5 distal end. The distal end of actuator sleeve 35 is terminated within adapter tube 96.
The proximal end of tube 90 is connected to actuator assembly 50.
Preferably a silicone adhesive is used. See FIG.11. Lumen 91 is vented to atmosphere via opening 59 in actuator assembly 50. Actuator sleeve 35 extends through tube 90 into a cut out portion 65 in the actuator housing 60.
Actuator rod 36 extends out of actuator sleeve 35 into cut out portion 65. The proximal end of actuator rod 36 includes an enlarged flange 33. Cut out portion 65 defines a distal shoulder 66 therein. A spring 70 is located around actuator rod 36 between shoulder 66 and flange 33 to bias actuator rod 36 toward the proximal end of the device.
An actuator knob 80 having a cam 81 located about its axis is connected to actuator housing 60. Cam 81 is located in abutting relationship to flange 33 of actuator rod 36. Cam 81 is configured to move flange 33 and thus actuator rod 36 distally against the force of spring 70 when actuator knob 80 is rotated. As cam 81 continues to rotate, spring 70 forces flange 33 and thus actuator rod 36 proximally to follow the contour of cam 81. Thus, by properly configuring cam 81, actuator rod 36 and thus seal assembly 30 can be moved proximally or distally the appropriate distance to place the device either in the pressure measurement mode or the rezero mode.
2 1 7642q Thus it is seen that an apparatus for use with an in vivo pressure transducer is provided that will allow the pressure transducer to be rezeroed in vivo.
PATENT APPLICATION
IN VIVO REZERO APPARATUS FOR A PRESSURE TRANSDUCER
Back~round of the Invention This invention relates to an apparatus that can rezero a pressure transducer in vivo.
Pressure transducers are used to monitor various patient pressures in multiple sites within the body. For example, pressure monitoring is used for hemodynamic monitoring to assess the cardio-pulmonary status of a critically ill patient. Another application where pressure monitoring is important is in patients who have experienced severe head trauma. In these head injured patients intracranial pressure (ICP) can rise due to tissue swelling or internalbleeding. Early diagnosis and treatment of brain swelling are critical to prevent secondary brain injury due to tissue ischemia.
Currently, the continuous measurement of physiologic pressures is performed using external pressure transducers. These ex vivo transducers are mounted near the patient and are connected to various physiologic locations via fluid filled tubing and catheters. Because of the inherent elasticity of the fluid filled tubing, the possibility of fluid leaks, leveling issues, and air bubbles entering the system, the external transducer system is a source of significant pressure and waveform inaccuracy. Infection is also a risk with fluid-coupled systems.
Pressure monitoring systems using an in vivo pressure transducer have solved some of these problems. However, in vivo pressure transducers suffer a unique problem not shared by external transducers. Pressure transducers that function with existing hospital monitors, both in vivo and ex vivo, supply a known or common output for a given change in pressure. Due to individual differences between transducers, each device must be zero referenced after connection to the hospital monitor. This is accomplished by exposing the pressure transducer to atmospheric pressure and then zeroing the monitor.
The monitor retains this transducer response as zero pressure. Additionally, 5 as a patient is transported throughout the hospital for diagnosis and/or treatment the pressure transducer is routinely disconnected from one monitor and connected to another at a remote location. Each time a pressure transducer is connected to a dirrerent monitor a new zero baseline must be established on that monitor. Extemal transducers are located ex vivo and can 10 be easily rezeroed by venting both sides of the transducer to atmospheric pressure. An in vivo pressure transducer, however, cannot be removed from the patient to vent both sides of the transducer to atmospheric pressure and to re-establish this zero baseline. Attempting to do so would expose the patient to an unacceptable risk of infection.
Thus there is a need for a device that will repeatably rezero an in vivo pressure transducer in vivo.
Summarv of the Invention It is therefore an object of this invention to provide a device that will 20 allow an in vivo pressure transducer to be rezeroed in vivo.
The in vivo rezero apparatus of this invention is comprised of a tip assembly that houses the pressure transducer and a portion of the rezero apparatus, a proximal actuator assembly that allows switching between measure and rezero modes, and a tube that connects the tip assembly to the 25 proximal actuator assembly. In use, the tip assembly of the device is placed 21 76~29 in the medium to be measured while the proximal actuator assembly resides ex vivo for connection to pressure monitoring equipment.
The tip assembly includes two lumens therein. It can have a bilumen configuration. Preferably the tip assembly is formed from a tube within a 5 sleeve to create the two lumen configuration. The tube is assembled eccentrically within the sleeve such that a portion of the tube abuts a portion of the sleeve. This arrangement ensures that the tip assembly has two distinct lumens. The distal end of the tube is open while the distal end of the sleeve surrounding the tube is closed. A pressure transducer is fixed to the 10 tube in the lumen created between the tube and sleeve. A movable seal assembly is located within the lumen of the tube.
In one embodiment of the tip assembly the tube has a first opening and a second opening through its wall so the two lumens are in fluid communication with one another. The pressure transducer is located over the 15 first opening which is prererably closer to the distal end of the tip assembly than the second opening. A third opening is located through the walls of both the tube and the sleeve at a location where these walls are in abutting relationship. This third opening places the interior of the tube in communication with the exterior of the tip assembly. The third opening is 20 distal to the first opening in the tube. In this embodiment only one side of the pressure transducer is ever exposed to physiological pressure.
In the pressure measurement mode, the movable seal assembly is positioned to allow physiologic pressure communication between the first opening in the tube and the third opening to the exterior of the tip assembly.
25 Atmospheric pressure is routed from the proximal end of the device through the tube to the backside of the pressure transducer via the second opening.
2~ 764~9 Physiologic pressure is transmitted through the third opening to the first opening under the pressure transducer. In this way the pressure transducer can measure physiologic pressure by using atmospheric pressure as a reference. By using an atmospheric pressure reference, the transducer is not 5 affected by changes in barometric pressure.
When the seal assembly is positioned in the rezero mode it allows communication between the first opening under the pressure transducer through the tube to an atmospheric vent through the proximal end of the device. Atmospheric pressure is also routed from the proximal end of the 10 device to the backside of the pressure transducer via the second opening.
Thus, both sides of the pressure transducer are exposed to atmospheric pressure.
In the second embodiment of the tip assembly, the wall of the sleeve has a sidehole adjacent to the pressure transducer exposing one side of the 15 pressure transducer to physiologic pressure. When the seal assembly is positioned in the measure mode it allows communication between the other side of the pressure transducer through the tube to an atmospheric vent through the proximal end of the device. In this situation, the pressure transducer is able to measure physiologic pressure. When the seal assembly 20 is positioned in the rezero mode it allows communication between the exteriorof the tip assembly through the third opening and to the other side of the pressure transducer through the first opening via the tube. In this position, both sides of the pressure transducer are exposed to physiologic pressure.
Since the pressure transducer is a differential pressure device, this condition 25 is equivalent to exposing both sides of the pressure transducer to atmospheric pressure. In this embodiment, there is no need for the second opening formed in the wall of the tube.
In the third embodiment of the tip assembly, there is no third opening nor any sidehole adjacent to the pressure transducer. In the measure mode, 5 one side of the pressure transducer is exposed to physiologic pressure via thefirst opening and the open distal end of the tube. The other side of the pressure transducer is vented to atmospheric pressure through the second opening and through the proximal end of the device via the tube. In the rezero mode, both sides of the pressure transducer are vented to atmospheric 10 pressure through the proximal end of the device.
In the fourth embodiment of the tip assembly, there is no second opening nor any third opening in the tube wall. However, the wall of the sleeve has a sidehole adjacent to the pressure transducer to expose one side of the pressure transducer to physiologic pressure. In the measure mode, the 15 one side of the pressure transducer is exposed to physiologic pressure via the sidehole in the sleeve and the other side is vented to atmospheric pressure through the first opening to the proximal end of the device via the tube. In therezero mode, the one side of the pressure transducer is still exposed to physiologic pressure via the sidehole in the sleeve, while the other side is 20 also exposed to physiologic pressure via the first opening and the open distal end of the tube. This condition is equivalent to exposing both sides of the pressure transducer to atmospheric pressure.
The proximal actuator assembly used in connection with each of the four embodiments includes a mechanism for controlling the movement of the 25 seal assembly. The seal assembly is connected to an actuator rod that extends through the tube. The actuator rod is biased in the proximal direction by a spring located in the housing for the proximal actuator assembly. A cam device connected to a rotating knob in the proximal actuator assembly is used to move the actuator rod against the bias of the spring in the distal direction.In this way, the seal assembly can be moved between its measure mode position and its rezero mode position.
Brief DescriPtion of the Drawin~s The above and other objects and advantages of the invention will be apparent upon consideration of the following drawings and detailed description. The preferred embodi- ments of the present invention are illustrated in the appended drawings in which like reference numbers refer to like elements and in which:
FIG. 1 is a perspective view of the in vivo rezero apparatus for a pressure transducer of this invention;
FIG. 2 is a side elevation view in cross-section of a first embodiment of the tip assembly with the rezero apparatus in the measure mode;
FIG. 3 is a view similar to the view shown in FIG. 2 but with the rezero apparatus in the rezero mode;
FIG. 4 is an end view of the tip assembly;
FIG. 5 is a side elevation view in cross-section of a second embodiment of the tip assembly with the rezero apparatus in the measure mode;
FIG. 6 is a view similar to the view shown in FIG. 5 but with the rezero apparatus in the rezero mode;
FIG. 7 is a side elevation view in cross-section of a third embodiment of the tip assembly with the rezero apparatus in the measure mode;
21 7642~
FIG. 8 is a view similar to the view shown in FIG. 7 but with the rezero apparatus in the rezero mode;
FIG. 9 is a side elevation view in cross-section of a fourth embodiment of the tip assembly with the rezero apparatus in the rezero mode;
FIG. 10 is a view similar to the view shown in FIG. 9 but with the rezero apparatus in the measure mode; and FIG. 11 is a top plan view partially in section of the proximal actuator assembly for the rezero apparatus of this invention.
Detailed DescriPtion of the Invention The in vivo rezero apparatus for a pressure transducer of this invention includes a tip assembly 10, a proximal actuator assembly 50 and a tube 90 that connects tip assembly 10 with proximal actuator assembly 50.
The pressure transducer 20 used in this device is a solid-state, silicon device employing a Wheatstone Bridge circuit configuration. It is a differentialpressure device. The difference between the pressure seen at one side of pressure transducer 20 and that seen at the other side is used to determine the pressure in the environment being monitored. Atmospheric pressure is typically used as the reference for physiologic pressure measurements. Thus, one side of pressure transducer 20 must be exposed to physiologic pressure while the other side is vented to atmospheric pressure. In order to rezero pressure transducer 20, both sides of pressure transducer 20 must be exposed to atmospheric pressure or, because it is a differential pressure device, to the same pressure.
Tip assembly 10, which houses pressure transducer 20, has two lumens therein. It can have a bilumen configuration. Preferably tip assembly 2 1 7642q 10 is formed from a tube 11 within a sieeve 15. Tube 1 1 and sleeve 15 are non-concentric and preferably tube 11 abuts sleeve 15 as shown in FIG. 4.
Tube 11 defines a lumen 12, which preferably has a circular cross-section.
Tube 11 is preferably formed from ceramic, metal or polymer and is chosen 5 for its structural as well as its non-magnetic properties. Sleeve 15 is a polymer extrusion or non-magnetic alloy and is adhered to tube 11 with an adhesive. Preferably silicone adhesive is used. The adhesive is applied between tube 1 1 and sleeve 15 to form a distal wall 16 that occludes the distalend of the lumen 19 formed between tube 11 and sleeve 15.
An opening 14 is located in tube 11 placing lumen 19 and lumen 12 in communication. Pressure transducer 20 is located over opening 14 and is fixed to tube 11 with an adhesive. Preferably silicone adhesive is used.
Another opening 17, distal to first opening 14, extends through tube 1 1 and sleeve 15 at a location where tube 11 and sleeve 15 are in abutting 15 relationship so that lumen 12 is in communication with the exterior of sleeve15. Physiologic pressure is communicated through opening 17 into lumen 12 and through opening 14 to one side of transducer 20.
In one embodiment of this invention, shown in FIGS. 2 and 3, only one side of pressure transducer 20 is ever exposed to physiologic pressure. This 20 pressure path is explained above. The other side of pressure transducer 20 isalways exposed to atmospheric pressure via lumen 19 between sleeve 15 and tube 11. Lumen 19 is vented to atmospheric pressure through a second opening 18 formed in tube 11 into lumen 12. Lumen 12 communicates with lumen 91 of tube 90 through adapter tube 96. Adapter tube 96 is bonded to tube 1 1 and tube 90 to attach tip assembly 10 to tube 90. The atmospheric 21 7~42q pressure path continues proximally through lumen 91 of catheter 90 and out through opening 59 in ~Gtll~tor assembly 50.
A movable seal assembly 30 located in lumen 12 is used to expose one side of pressure transducer 20 to either atmospheric pressure or physiologic 5 pressure. The seal assembly 30 includes two seals 31, 32 formed from a rigid tube made from a non-magnetic alloy or polymer, with a coating of silicone over the outer diameter. The silicone material is applied in an even thickness to form an interference seal with lumen 12 of tube 11. Two seals 31, 32 are attached to actuator rod 33 at a fixed distance by an epoxy or other adhesive.
In the measure mode, see FIG. 2, seal assembly 30 is positioned such that distal seal 31 is distal of opening 17 and proximal seal 32 is between opening 14 and opening 18. Thus, opening 14 and opening 17 are in communication and provide an unobstructed path for the physiologic pressure to reach pressure transducer 20. The pressure path is through opening 17, lumen 12 and opening 14. In the rezero mode, see FIG. 3, seal assembly 30 is moved distally so distal seal 31 is still distal of opening 17 but proximal seal 32 is between opening 17 and opening 14. In this position, both sides of pressure transducer 20 are exposed to atmospheric pressure. One side of pressure transducer 20 is vented to atmospheric pressure via lumen 19, opening 18, lumen 12, and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50. The other side of pressure transducer 20 is vented to atmospheric pressure via opening 14, lumen 12, and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50.
In a second embodiment, both sides of pressure transducer 20 can be exposed to physiologic pressure. See FIGS. 5 and 6. In this embodiment, a sidehole 26 is formed in the wall of sleeve 15 over pressure transducer 20 to 2 1 7642q expose one side of pressure trans- ducer 20 to physiologic pressure. In the measure mode, see FIG. 5, seal assembly 30 is positioned such that distal seal 31 is distal to opening 17 and proximal seal 32 is between opening 17 and opening 14. In this position, the other side of pressure transducer 20 is 5 vented to atmosphere via opening 14, lumen 12 and lumen 91 of catheter tube 90 to opening 59 in actuator assembly 50. The one side of pressure transducer 20 is exposed to physiologic pressure via sidehole 26. In the rezero mode, see FIG. 6, seal assembly 30 is moved proximally so distal seal 31 is still distal of opening 17 but proximal seal 32 is proximal of opening 14.10 The one side of pressure transducer 20 is still exposed to physiologic pressure via sidehole 26, while the other side of pressure transducer 20 is exposed to physiologic pressure via opening 17, lumen 12 and opening 14.
Since pressure transducer 20 is a differential pressure device, this condition is equivalent to exposing both sides of pressure transducer 20 to atmospheric 15 pressure. Although this embodiment is shown in FIGS. 5 and 6 with opening 18, it is to be understood that opening 18 is not necessary to its operation.
In a third embodiment of this invention, seal assembly 30 uses a single seal 31 movable within lumen 12. See FIGS. 7 and 8. In the measure mode, see FIG. 7, seal 31 is proximal to opening 14 and distal to opening 18. In this 20 mode, the one side of pressure transducer 20 is exposed to atmospheric pressure via lumen 19, opening 18, lumen 12 and lumen 91 to opening 59 in actuator assembly 50. The other side of pressure transducer 20 is exposed to physiologic pressure via opening 14 and lumen 12 through the open distal end of tube 11. In the rezero mode, see FIG. 8, seal 31 is distal to opening 25 14. In this mode, the one side of pressure transducer 20 is exposed to atmospheric pressure as already discussed in connection with the measure mode of this embodiment and the other side of pressure transducer 20 is also exposed to atmospheric pressure via opening 14, lumen 12 and lumen 91 to opening 59 in actuator assembly 50.
The fourth embodiment of this invention is similar to the third 5 embodiment except that sidehole 26 in sleeve 15 exposes pressure transducer 20 to physiologic pressure. See FIGS. 9 and 10. In the measure mode, see FIG.10, seal 31 is distal of opening 14. In this mode, the one side of pressure transducer 20 is exposed to physiologic pressure via sidehole 26 and the other side of pressure transducer 20 is exposed to atmospheric pressure via opening 14, lumen 12 and lumen 91 to opening 59 in actuator assembly 50. In the rezero mode, see FIG. 9, seal 31 is moved proximal to opening 14. In this mode, the one side of pressure transducer 20 is still exposed to physiologic pressure as discussed above. However, the other side of pressure transducer 20 is also exposed to physiologic pressure via opening 14, lumen 12 and the open distal end of tube 11. Since pressure transducer 20 is a differential pressure device, this condition is equivalent toexposing both sides of pressure transducer 20 to atmospheric pressure.
In all the described embodiments, tip assembly 10 is connected to the distal end of tube 90. Tube 90 is preferably formed from a silicone elastomer and defines a single lumen 91 therethrough. Adapter tube 96 extends proximally of tip assembly 10 and is bonded within lumen 91 of tube 90.
Preferably a silicone adhesive is used. Adapter tube 96 is preferably formed from a non-magnetic alloy. Lumen 91 houses actuator rod 36, actuator sleeve 35, carrier tube 95 and provides an atmospheric pressure path from tip assembly 10 to actuator assembly 50. Carrier tube 95 is preferably a polymer extrusion and carries conductor wires (not shown) from pressure transducer 21 764~9 20 to the proximal end of the device for connection to a standard hospital monitor (not shown). Actuator sleeve 35 is preferably a wound non-magnetic alloy and houses actuator rod 36. Actuator rod 36 is prererdbly formed from a highly elastic non-magnetic alloy and is attached to seal assembly 30 at its 5 distal end. The distal end of actuator sleeve 35 is terminated within adapter tube 96.
The proximal end of tube 90 is connected to actuator assembly 50.
Preferably a silicone adhesive is used. See FIG.11. Lumen 91 is vented to atmosphere via opening 59 in actuator assembly 50. Actuator sleeve 35 extends through tube 90 into a cut out portion 65 in the actuator housing 60.
Actuator rod 36 extends out of actuator sleeve 35 into cut out portion 65. The proximal end of actuator rod 36 includes an enlarged flange 33. Cut out portion 65 defines a distal shoulder 66 therein. A spring 70 is located around actuator rod 36 between shoulder 66 and flange 33 to bias actuator rod 36 toward the proximal end of the device.
An actuator knob 80 having a cam 81 located about its axis is connected to actuator housing 60. Cam 81 is located in abutting relationship to flange 33 of actuator rod 36. Cam 81 is configured to move flange 33 and thus actuator rod 36 distally against the force of spring 70 when actuator knob 80 is rotated. As cam 81 continues to rotate, spring 70 forces flange 33 and thus actuator rod 36 proximally to follow the contour of cam 81. Thus, by properly configuring cam 81, actuator rod 36 and thus seal assembly 30 can be moved proximally or distally the appropriate distance to place the device either in the pressure measurement mode or the rezero mode.
2 1 7642q Thus it is seen that an apparatus for use with an in vivo pressure transducer is provided that will allow the pressure transducer to be rezeroed in vivo.
Claims (46)
1. An in vivo rezero apparatus for a pressure transducer, comprising:
a sleeve having a first lumen and a second lumen therein;
a wall separating the first lumen and the second lumen, the wall defining an opening therein to place the first lumen and the second lumen in fluid communication;
a pressure transducer having a first side and a second side fixed to the wall over the opening;
a means for exposing the first side of the pressure transducer to physiologic pressure; and a means for equalizing the pressure on the first side and the second side of the pressure transducer.
a sleeve having a first lumen and a second lumen therein;
a wall separating the first lumen and the second lumen, the wall defining an opening therein to place the first lumen and the second lumen in fluid communication;
a pressure transducer having a first side and a second side fixed to the wall over the opening;
a means for exposing the first side of the pressure transducer to physiologic pressure; and a means for equalizing the pressure on the first side and the second side of the pressure transducer.
2. The in vivo rezero apparatus for a pressure transducer of claim 1 further comprising a means for communicating atmospheric pressure to the first side of the pressure transducer.
3. The in vivo rezero apparatus for a pressure transducer of claim 2 wherein the means for equalizing the pressure on the first side and the second side of the pressure transducer includes a seal movably disposed in the first lumen.
4. The in vivo rezero apparatus for a pressure transducer of claim 3 further comprising a means for moving the seal between a first position and a second position.
5. An in vivo rezero apparatus for a pressure transducer, comprising:
a sleeve defining a first lumen and a second lumen therein;
a pressure transducer having a first side and a second side disposed in one of the first lumen or the second lumen so that the first side of the pressure transducer is in fluid communication with the first lumen and the second side of the pressure transducer is in fluid communication with the second lumen;
and a seal disposed in the first lumen and movable between a first position where the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a first opening defined by the sleeve and the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via a second opening proximal of the first opening and a second position where the first side of the pressure transducer and the second side of the pressure transducer are in fluid communication with the exterior of the sleeve via the second opening proximal of the first opening.
a sleeve defining a first lumen and a second lumen therein;
a pressure transducer having a first side and a second side disposed in one of the first lumen or the second lumen so that the first side of the pressure transducer is in fluid communication with the first lumen and the second side of the pressure transducer is in fluid communication with the second lumen;
and a seal disposed in the first lumen and movable between a first position where the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a first opening defined by the sleeve and the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via a second opening proximal of the first opening and a second position where the first side of the pressure transducer and the second side of the pressure transducer are in fluid communication with the exterior of the sleeve via the second opening proximal of the first opening.
6. The in vivo rezero apparatus for a pressure transducer of claim 5 wherein the seal includes a proximal seal and a distal seal.
7. The in vivo rezero apparatus for a pressure transducer of claim 5 further comprising a wall disposed in the sleeve separating the first lumen from the second lumen and wherein the wall defines a third opening and a fourth opening therein to place the first lumen in fluid communication with the second lumen and wherein the pressure transducer is disposed over the third opening.
8. The in vivo rezero apparatus for a pressure transducer of claim 7 wherein the first opening is distal of the third opening, the third opening is distal of the fourth opening and the second opening is proximal of the fourth opening.
9. The in vivo rezero apparatus for a pressure transducer of claim 8 wherein the seal includes a proximal seal and a distal seal such that in the first position the distal seal is distal of the first opening and the proximal seal is between the third opening and the fourth opening and in the second position the distal seal is distal of the first opening and the proximal seal isbetween the third opening and the first opening.
10. The in vivo rezero apparatus for a pressure transducer of claim 5 further comprising a wall disposed in the sleeve separating the first lumen from the second lumen and wherein the wall defines a third opening therein to place the first lumen in fluid communication with the second lumen and wherein the pressure transducer is disposed over the third opening.
11. The in vivo rezero apparatus for a pressure transducer of claim 10 wherein the third opening is between the first opening and the second opening.
12. The in vivo rezero apparatus for a pressure transducer of claim 11 wherein when the seal is in the first position, the seal is between the third opening and the second opening and when the seal is in the second position, the seal is between the third opening and the first opening.
13. The in vivo rezero apparatus for a pressure transducer of any of claims 5-12 wherein the seal is connected to an actuator rod extending proximal of the seal.
14. The in vivo rezero apparatus for a pressure transducer of claim 13 wherein the actuator rod includes a proximal end disposed in a housing between a spring and a rotatable cam such that the spring biases the proximal end of the actuator rod against the rotatable cam.
15. An in vivo rezero apparatus for a pressure transducer, comprising:
a sleeve defining a first lumen and a second lumen therein and further defining a sidehole therein;
a pressure transducer having a first side and a second side disposed in one of the first lumen or the second lumen adjacent to the sidehole so the firstside of the pressure transducer is in fluid communication with the first lumen;
a seal disposed in the first lumen and movable between a first position where the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole and the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a first opening proximal of the sidehole and a second position where the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a second opening defined by the sleeve distal of the first opening and the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole.
a sleeve defining a first lumen and a second lumen therein and further defining a sidehole therein;
a pressure transducer having a first side and a second side disposed in one of the first lumen or the second lumen adjacent to the sidehole so the firstside of the pressure transducer is in fluid communication with the first lumen;
a seal disposed in the first lumen and movable between a first position where the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole and the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a first opening proximal of the sidehole and a second position where the first side of the pressure transducer is in fluid communication with the exterior of the sleeve via a second opening defined by the sleeve distal of the first opening and the second side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole.
16. The in vivo rezero apparatus for a pressure transducer of claim 15 wherein the seal includes a proximal seal and a distal seal.
17. The in vivo rezero apparatus for a pressure transducer of claim 15 further comprising a wall disposed in the sleeve separating the first lumen from the second lumen and wherein the wall defines a third opening therein to place the first lumen in fluid communication with the second lumen and where the pressure transducer is disposed over the third opening.
18. The in vivo rezero apparatus for a pressure transducer of claim 17 wherein the sidehole is proximal of the second opening and the sidehole is distal of the first opening.
19. The in vivo rezero apparatus for a pressure transducer of claim 18 wherein the seal includes a proximal seal and a distal seal such that in the first position the distal seal is distal of the second opening and the proximal seal is between the second opening and the third opening and in the second position the distal seal is distal of the second opening and the proximal seal is proximal of the third opening.
20. The in vivo rezero apparatus for a pressure transducer of claim 18 wherein when the seal is in the first position the seal is between the third opening and the second opening and when the seal is in the second position the seal is between the first opening and the third opening.
21. The in vivo rezero apparatus for a pressure transducer of any of claims 15-20 wherein the seal is connected to an actuator rod extending proximal of the seal.
22. The in vivo rezero apparatus for a pressure transducer of claim 21 wherein the actuator rod includes a proximal end disposed in a housing between a spring and a rotatable cam such that the spring biases the proximal end of the actuator rod against the rotatable cam.
23. An in vivo rezero apparatus for a pressure transducer, comprising:
a tube with an exterior wall having a first opening therein and defining a first lumen therein;
a sleeve having an interior wall affixed over the tube such that at least a portion of the exterior wall and a portion of the interior wall are in abutting relationship thereby creating a second lumen between the sleeve and the tube;
a pressure transducer affixed to the wall of the tube over the first opening in the tube;
a second opening through the portion of the exterior wall of the tube and the portion of the interior wall of the sleeve that are in abutting relationship distal to the first opening; and a movable seal within the first lumen and movable between a first position and a second position.
a tube with an exterior wall having a first opening therein and defining a first lumen therein;
a sleeve having an interior wall affixed over the tube such that at least a portion of the exterior wall and a portion of the interior wall are in abutting relationship thereby creating a second lumen between the sleeve and the tube;
a pressure transducer affixed to the wall of the tube over the first opening in the tube;
a second opening through the portion of the exterior wall of the tube and the portion of the interior wall of the sleeve that are in abutting relationship distal to the first opening; and a movable seal within the first lumen and movable between a first position and a second position.
24. The in vivo rezero apparatus for a pressure transducer of claim 23 wherein the exterior wall of the tube defines a third opening therein.
25. The in vivo rezero apparatus of Claim 24 wherein when the seal is in the first position the first opening and the second opening are in fluid communication and when the seal is in the second position the first opening and the third opening are in fluid communication.
26. The in vivo rezero apparatus of Claim 25 further comprising a means for communicating atmospheric pressure to the first lumen of the tube.
27. The in vivo rezero apparatus of Claim 25 further comprising a means for moving the seal between the first position and the second position.
28. The in vivo rezero apparatus of Claim 23 wherein the sleeve defines a sidehole adjacent to the pressure transducer such that one side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole.
29. The in vivo rezero apparatus of Claim 28 wherein when the seal is in the first position the first opening is in fluid communication with the firstlumen and when the seal is in the second position the first opening and the second opening are in fluid communication.
30. The in vivo rezero apparatus of Claim 29 further comprising a means for communicating atmospheric pressure to the first lumen of the tube.
31. The in vivo rezero apparatus of Claim 29 further comprising a means for moving the seal between the first position and the second position.
32. An in vivo rezero apparatus for a pressure transducer, comprising:
a tube having an exterior wall with a first opening therein and defining a first lumen with an open distal end therein;
a sleeve having an interior wall affixed over the tube such that at least a portion of the exterior wall and a portion of the interior wall are in abutting relationship thereby creating a second lumen between the sleeve and tube;
a pressure transducer affixed to the exterior wall of the tube over the first opening in the tube; and a movable seal within the first lumen and movable between a first position and a second position.
a tube having an exterior wall with a first opening therein and defining a first lumen with an open distal end therein;
a sleeve having an interior wall affixed over the tube such that at least a portion of the exterior wall and a portion of the interior wall are in abutting relationship thereby creating a second lumen between the sleeve and tube;
a pressure transducer affixed to the exterior wall of the tube over the first opening in the tube; and a movable seal within the first lumen and movable between a first position and a second position.
33. The in vivo rezero apparatus of Claim 32 wherein the exterior wall of the tube defines a second opening therein such that when the seal is in the first position the first opening and the open distal end of the tube are in fluid communication and when the seal is in the second position the first opening and the second opening are in fluid communication.
34. The in vivo rezero apparatus of Claim 33 further comprising a means for communicating atmospheric pressure to the first lumen of the tube.
35. The in vivo rezero apparatus of Claim 33 further comprising a means for moving the seal between the first position and the second position.
36. The in vivo rezero apparatus of Claim 32 wherein the sleeve defines a sidehole adjacent to the pressure transducer such that one side of the pressure transducer is in fluid communication with the exterior of the sleeve via the sidehole.
37. The in vivo rezero apparatus of Claim 36 wherein when the seal is in the first position the first opening is in fluid communication with the first lumen and when the seal is in the second position the first opening and the open distal end of the tube are in fluid communication.
38. The in vivo rezero apparatus of Claim 37 further comprising a means for communicating atmospheric pressure to the first lumen of the tube.
39. The in vivo rezero apparatus of Claim 37 further comprising a means for moving the seal between the first position and the second position.
40. An in vivo rezero apparatus for a pressure transducer, comprising:
a tip assembly having a distal end and a proximal end and including a sleeve having an interior wall and a first tube having an exterior wall and defining a first lumen therein and disposed in the sleeve and affixed thereto in an area where at least a portion of the exterior wall and the interior wall are in abutting relationship to define a second lumen between the first tube and the sleeve;
a second tube having a proximal end and a distal end affixed to the proximal end of the tip assembly, the second tube defining a third lumen in fluid communication with the first lumen;
a handle affixed to the proximal end of the second tube; and a seal assembly including a distal seal connected to an actuator rod movably disposed in the first lumen and the third lumen.
a tip assembly having a distal end and a proximal end and including a sleeve having an interior wall and a first tube having an exterior wall and defining a first lumen therein and disposed in the sleeve and affixed thereto in an area where at least a portion of the exterior wall and the interior wall are in abutting relationship to define a second lumen between the first tube and the sleeve;
a second tube having a proximal end and a distal end affixed to the proximal end of the tip assembly, the second tube defining a third lumen in fluid communication with the first lumen;
a handle affixed to the proximal end of the second tube; and a seal assembly including a distal seal connected to an actuator rod movably disposed in the first lumen and the third lumen.
41. The in vivo rezero apparatus for a pressure transducer of claim 40 wherein the exterior wall defines a first opening and a second opening therein to place the first lumen and the second lumen in fluid communication and a third opening defined by the area where at least a portion of the exterior wall and the interior wall are in abutting relationship and further comprising a pressure transducer disposed in the second lumen over the first opening.
42. The in vivo rezero apparatus for a pressure transducer of claim 41 wherein the seal assembly further includes a proximal seal and a distal seal.
43. The in vivo rezero apparatus for a pressure transducer of claim 40 wherein the exterior wall defines a first opening therein to place the first lumen and the second lumen in fluid communication and wherein the sleeve defines a sidehole therein and further comprising a pressure transducer disposed in the second lumen over the first opening adjacent the sidehole.
44. The in vivo rezero apparatus for a pressure transducer of claim 43 wherein the seal assembly further includes a proximal seal and a distal seal.
45. The in vivo rezero apparatus for a pressure transducer of claim 40 wherein the exterior wall defines a first opening and a second opening therein to place the first lumen in fluid communication with the second lumen and further comprising a pressure transducer disposed in the second lumen over the first opening.
46. The in vivo rezero apparatus for a pressure transducer of claim 40 wherein the exterior wall defines an opening therein to place the first lumen influid communication with the second lumen and wherein the sleeve defines a sidehole therein and further comprising a pressure transducer disposed in the second lumen over the first opening adjacent to the sidehole.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/492,175 US5788642A (en) | 1995-06-19 | 1995-06-19 | In vivo rezero apparatus for a pressure transducer |
| US08/492,175 | 1995-06-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2176429A1 true CA2176429A1 (en) | 1996-12-20 |
Family
ID=23955238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002176429A Abandoned CA2176429A1 (en) | 1995-06-19 | 1996-05-13 | In vivo rezero apparatus for a pressure transducer |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5788642A (en) |
| EP (1) | EP0749721A1 (en) |
| JP (1) | JP2709297B2 (en) |
| CA (1) | CA2176429A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6120457A (en) * | 1997-07-02 | 2000-09-19 | Johnson & Johnson Professional, Inc. | In vivo zeroing of catheter pressure sensor |
| US20030131569A1 (en) * | 2002-01-02 | 2003-07-17 | Playtex Products, Inc. | Odor control cassette |
| US7195594B2 (en) * | 2002-05-14 | 2007-03-27 | Pacesetter, Inc. | Method for minimally invasive calibration of implanted pressure transducers |
| US7771362B2 (en) * | 2005-08-01 | 2010-08-10 | Datascope Investment Corp. | Calibration of in vivo blood pressure sensors |
| WO2011014704A2 (en) | 2009-07-30 | 2011-02-03 | Tandem Diabetes Care, Inc. | Infusion pump system with disposable cartridge having pressure venting and pressure feedback |
| EP2683422B1 (en) | 2011-03-07 | 2019-05-08 | Potrero Medical, Inc. | Sensing foley catheter |
| US9180242B2 (en) | 2012-05-17 | 2015-11-10 | Tandem Diabetes Care, Inc. | Methods and devices for multiple fluid transfer |
| US9173998B2 (en) | 2013-03-14 | 2015-11-03 | Tandem Diabetes Care, Inc. | System and method for detecting occlusions in an infusion pump |
| CN107458282A (en) * | 2016-06-02 | 2017-12-12 | 宝沃汽车（中国）有限公司 | A kind of movable table of seat and there is its seat and vehicle |
| DE102016118673A1 (en) * | 2016-09-30 | 2018-04-05 | Isar-M Gmbh | System for the early detection of post-operative bleeding |
| CN107184191A (en) * | 2017-06-29 | 2017-09-22 | 长飞光纤光缆股份有限公司 | A kind of miniature insertion type probe |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3833723A1 (en) * | 1988-10-04 | 1990-04-12 | Berg Extrakorp Syst Medtech | METHOD FOR ZERO COMPARISON OF A PRESSURE MEASURING CATHETER AND PRESSURE MEASURING CATHETER FOR ITS IMPLEMENTATION |
| US4966161A (en) * | 1989-03-31 | 1990-10-30 | Utah Medical Products | Apparatus for continuously measuring intracompartmental pressure within a body cavity |
| US5050297A (en) * | 1989-09-21 | 1991-09-24 | Becton, Dickinson And Company | Method for assembly of a directly exposed catheter sensor on a support tip |
| US5203340A (en) * | 1990-09-07 | 1993-04-20 | Becton, Dickinson And Company | Apparatus for rezeroing an in vivo pressure sensor and method for rezeroing |
| US5133358A (en) * | 1990-09-07 | 1992-07-28 | Becton, Dickinson And Company | Apparatus for rezeroing an in vivo pressure sensor and method for rezeroing |
| US5218965A (en) * | 1990-12-03 | 1993-06-15 | Becton, Dickinson And Company | Apparatus for carrying a sensor in a connector for a catheter adapter |
| US5437284A (en) * | 1993-12-30 | 1995-08-01 | Camino Laboratories, Inc. | System and method for in vivo calibration of a sensor |
-
1995
- 1995-06-19 US US08/492,175 patent/US5788642A/en not_active Expired - Lifetime
-
1996
- 1996-05-13 CA CA002176429A patent/CA2176429A1/en not_active Abandoned
- 1996-05-22 EP EP96303650A patent/EP0749721A1/en not_active Withdrawn
- 1996-06-18 JP JP8157037A patent/JP2709297B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH095184A (en) | 1997-01-10 |
| US5788642A (en) | 1998-08-04 |
| EP0749721A1 (en) | 1996-12-27 |
| JP2709297B2 (en) | 1998-02-04 |
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