CA2091945A1 - Portable hand-held power assister device - Google Patents
Portable hand-held power assister deviceInfo
- Publication number
- CA2091945A1 CA2091945A1 CA002091945A CA2091945A CA2091945A1 CA 2091945 A1 CA2091945 A1 CA 2091945A1 CA 002091945 A CA002091945 A CA 002091945A CA 2091945 A CA2091945 A CA 2091945A CA 2091945 A1 CA2091945 A1 CA 2091945A1
- Authority
- CA
- Canada
- Prior art keywords
- hand
- held power
- lead screw
- injection device
- syringe
- 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
- A61M—DEVICES 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
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/178—Syringes
- A61M5/20—Automatic syringes, e.g. with automatically actuated piston rod, with automatic needle injection, filling automatically
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
- A61M5/14546—Front-loading type injectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES 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
- A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
- A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
- A61M5/142—Pressure infusion, e.g. using pumps
- A61M5/145—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons
- A61M5/1452—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons
- A61M5/14566—Pressure infusion, e.g. using pumps using pressurised reservoirs, e.g. pressurised by means of pistons pressurised by means of pistons with a replaceable reservoir for receiving a piston rod of the pump
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- Health & Medical Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Anesthesiology (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Heart & Thoracic Surgery (AREA)
- Hematology (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Vascular Medicine (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Light Receiving Elements (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Coating Apparatus (AREA)
- Endoscopes (AREA)
- Surgical Instruments (AREA)
- Fertilizing (AREA)
- Percussion Or Vibration Massage (AREA)
- Electrophonic Musical Instruments (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Amplifiers (AREA)
- Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
- Apparatus For Radiation Diagnosis (AREA)
- Massaging Devices (AREA)
- Catching Or Destruction (AREA)
- Transceivers (AREA)
- Telephone Set Structure (AREA)
- Manipulator (AREA)
Abstract
ABSTRACT
A hand-held power injection device is provided for injecting liquid, such as contrast media, into the vascular system of a mammal.
The device comprises a pistol-shaped housing which encloses a battery-powdered D. C. motor for constant-rate delivery of liquid from a syringe.
A hand-held power injection device is provided for injecting liquid, such as contrast media, into the vascular system of a mammal.
The device comprises a pistol-shaped housing which encloses a battery-powdered D. C. motor for constant-rate delivery of liquid from a syringe.
Description
20~19~5 PO:~TABLE HAND-~:LD POWER ASSISl~;~ DEVICE
BACKGRQ~D QF THE lNVENTiO~
1. Field ofthe Invention This invention relates to a hand-held controllable power assister device as applied to syringes adopted to deliver a liquid into a patient.
10 More particularly, the invention relates to a held-held controllable power injection device for delivering, by injection, x-ray contrast media into a patient prior to or during urographic or angiographic procedures.
BACKGRQ~D QF THE lNVENTiO~
1. Field ofthe Invention This invention relates to a hand-held controllable power assister device as applied to syringes adopted to deliver a liquid into a patient.
10 More particularly, the invention relates to a held-held controllable power injection device for delivering, by injection, x-ray contrast media into a patient prior to or during urographic or angiographic procedures.
2. Re~orted Develo~ments Urography is a radiological technique wherein at least a part of the urinary tract OI a mammal is rendered opaque by intravenous injection of a contrast medium or by injection into the bladder through the urethra.
Angiography is also a radiological technique wherein the arteries or veins of a mammal are outlined by injecting a radiographic medium.
In both techniques the coated vascular structures are 2 5 radiographically imaged for diagnostic purposes.
For delivery to the desired site, the contrast medium is placed in an appropriate syringe and forced through a hollow needle or a catheter in such a manner that the contrast medium enters the blood stream or 3 0 the bladder at the appropriate time and place for taking radiographic images. As contrast medium is being injected to the site to be visualized through the hollow needle or a catheter, high pressures are often encountered, sometimes as high as 1,000 psi. This requires a rather high force to be exerted on the piston in order to deliver the content of the 3 5 syringe. Furthermore, such force is to be exerted in a constant manner - 20~19~
for continuous and even volume delivery of the contrast medium. Early injection systems were designed for manual injection of the contrast medium by means of a hand-held glass syringe. A mechanical injection system activated by a foot s vitch has also been, and is still being used for S most general radiographic procedures. However, this system was only rarely used for coronary angiography for the probable reason that operator control is greatly reduced and the risk of coronary artery dissection increased.
Power injectors in general have certain advantages over hand-operated injectors including the following. They reduce reliance on an assistant enabling the operator to be in complete control of the injection of the contrast medium, they can deliver a precise volume, and the pressure generated can be limited by presetting a pressure limit.
Power injectors are of three types: hydraulic, pneumatic and electric. Hydraulic injectors have an electric motor connected to a hydraulic pump, which drives a ram connected to a syringe that contains the contrast medium. In pneumatic injectors, the source of 2 0 power is compressed gas supplied by a tank or compressor. Electric injectors are powered by electric motors in which a transmission means serves to change circular motion into linear motion which then drives a ram.
2 5 While typical power injectors eliminate the physical effort required with manual injectors, they are not easy to use, are expensive and the perception of instantaneous control present with manual injectors is lost because the syringe and controls for the injectors are not hand-held or not conveniently handleable during the injection process.
3 0 For example, a gas power-assister hand-held syringe does eliminate the physical effort associated with manual injection and also provides a perceived instantaneous control of the injection, however, it requires a gas system to power the syringe, such as pressurized carbon dioxide gas. The gas delivery system includes a carbon dioxide gas tank with .
` 20919~
various indicators and controls, which reduces the portability of the device, it requires valuable space in the proximity of the injection, it adds to the complexity of using the device for the intended purpose and requires periodic replacement of the gas tank.
Battery pow,~ered injectors are also available for use in angiography and urography employing a syringe for holding a contrast medium and a plunger connected to a mechanical means to automatically deliver the contrast medium. Some of these injectors 10 include microprocessor technology for programming rates and time delivery and have visual or audio display for ease of controlling the injection process. As these injectors become more 60phisticated, the cost of making and using them increases as well as the complexity of use tends to increase the opportunities for breakdown.
The present invention is directed to a hand-held, light-weight power assister which eliminates the physical effort required with manual injectors but otherwise allows the practitioner complete human control of the injection process.
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Angiography is also a radiological technique wherein the arteries or veins of a mammal are outlined by injecting a radiographic medium.
In both techniques the coated vascular structures are 2 5 radiographically imaged for diagnostic purposes.
For delivery to the desired site, the contrast medium is placed in an appropriate syringe and forced through a hollow needle or a catheter in such a manner that the contrast medium enters the blood stream or 3 0 the bladder at the appropriate time and place for taking radiographic images. As contrast medium is being injected to the site to be visualized through the hollow needle or a catheter, high pressures are often encountered, sometimes as high as 1,000 psi. This requires a rather high force to be exerted on the piston in order to deliver the content of the 3 5 syringe. Furthermore, such force is to be exerted in a constant manner - 20~19~
for continuous and even volume delivery of the contrast medium. Early injection systems were designed for manual injection of the contrast medium by means of a hand-held glass syringe. A mechanical injection system activated by a foot s vitch has also been, and is still being used for S most general radiographic procedures. However, this system was only rarely used for coronary angiography for the probable reason that operator control is greatly reduced and the risk of coronary artery dissection increased.
Power injectors in general have certain advantages over hand-operated injectors including the following. They reduce reliance on an assistant enabling the operator to be in complete control of the injection of the contrast medium, they can deliver a precise volume, and the pressure generated can be limited by presetting a pressure limit.
Power injectors are of three types: hydraulic, pneumatic and electric. Hydraulic injectors have an electric motor connected to a hydraulic pump, which drives a ram connected to a syringe that contains the contrast medium. In pneumatic injectors, the source of 2 0 power is compressed gas supplied by a tank or compressor. Electric injectors are powered by electric motors in which a transmission means serves to change circular motion into linear motion which then drives a ram.
2 5 While typical power injectors eliminate the physical effort required with manual injectors, they are not easy to use, are expensive and the perception of instantaneous control present with manual injectors is lost because the syringe and controls for the injectors are not hand-held or not conveniently handleable during the injection process.
3 0 For example, a gas power-assister hand-held syringe does eliminate the physical effort associated with manual injection and also provides a perceived instantaneous control of the injection, however, it requires a gas system to power the syringe, such as pressurized carbon dioxide gas. The gas delivery system includes a carbon dioxide gas tank with .
` 20919~
various indicators and controls, which reduces the portability of the device, it requires valuable space in the proximity of the injection, it adds to the complexity of using the device for the intended purpose and requires periodic replacement of the gas tank.
Battery pow,~ered injectors are also available for use in angiography and urography employing a syringe for holding a contrast medium and a plunger connected to a mechanical means to automatically deliver the contrast medium. Some of these injectors 10 include microprocessor technology for programming rates and time delivery and have visual or audio display for ease of controlling the injection process. As these injectors become more 60phisticated, the cost of making and using them increases as well as the complexity of use tends to increase the opportunities for breakdown.
The present invention is directed to a hand-held, light-weight power assister which eliminates the physical effort required with manual injectors but otherwise allows the practitioner complete human control of the injection process.
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4 209194~
SUMMARY OF THE INVENTION
The power assister device of the present invention is designed to be hand-held by one hand, light weight, inexpensive and to allow complete control over the process of delivering radiopaque media to the patient by the medical practitioner.
To that end, its configuration resembles a pistol, the handle portion of which provides for firm hold. Activating switch, having on-off- and neutral positions, is located in the handle portion to be controlled by the index finger of the practitioner.
While the device does not incorporate complicated and expensive electronic components which tend to break down and are cumber-some to use, it provides electrical energy to deliver the contrast media to the patient at a constant rate of delivery and it incorporates limit switches to automatically stop the electric motor when the lead screw, which engages the piston, is in its initial or completely extended position.
In accordance with the invention, the hand-held power assister device comprises: a pistol-shaped casing; a syringe having a slideable piston therein, removably coupled to said casing; and drive means, contained in said casing, for driving the piston in said syringe to deliver said liquid to the patient.
The casing is preferably made of light but tough plastic material and safely houses all components which may include: a D.C. motor to provide angular motion; rechargeable batteries to supply electrical power to the motor;recharging means for the batteries; a lead screw having a female engagement means to engage a piston; gear means to translate angular motion 4a produced by the motor to linear motion of the lead screw;limit switches to stop the motor when lead screw is in its initial or completely extended positions; and 20919~5 trigger switch with electrical leads to batteries and to the motor for controlling the movement of the lead screw.
The syringe used in the present invention may be of various sizes, such as from 10 ml to 50 ml to 100 ml or larger, depending on the volume requirement of the patient and the type and concentration of the radiopaque or other media. The syringe has a luer connector at one end to engage a catheter or a butterfly needle which is to be inserted in the injection site. The other end of the syringe is equipped with a flange to engage a receiving slot in the front end of the casing of the hand-held power assister device. The syringe barrel holds a slideable piston or plunger therein and is equipped with a male engagement means to mate with female engagement means of the lead screw.
The recharging means consists of a recharger unit equipped with two plugs one of which is inserted into the receptacle on the power assister device and the other into a standard electrical outlet.
20919~
FIG. 1 is a perspective view of the hand-held power assister, a syringe S engaged with said power assister, butterfly needle in place and battery charger unit;
FIG 2. is a fiectional view of the hand-held power assister;
FIG.3 is a cross-sectional view of the hand-held power assister taken along the line 3-3 of FIG. 2, showing the syringe engaged and the syringe piston in its engagement position.
FIG. 4 is a cross-sectional view of the hand-held power assister, 1 5 showing syringe piston in its extended position, taken along line 3-3 of FIG. 2;
FIG.5 i6 a transverse cross-sectional view of the hand-held power assister and syringe engaged therewith, taken along line 5-5 of FIG.2;
FIG.6 is a partial transverse cross-sectional view of the hand-held assister device taken along line 5-5 of FIG. 2;
S FIG. 7 is a cross-sectional view of the hand-held power assister taken along the line 7-7 of FIG. 2;
FIG.8 is a cross-sectional view of the hand-held power assister taken along the line 8-8 of FIG. 2; and FIG.9 is a perspective view of the syringe not engaged with the power assister.
20919~5 RIPIION ~ THE E~IBO12~T
Referring to FIG. 1, power assister device 10 is shown with syringe 12 engaging said device, butterfly needle 13 attached to said 5 syringe by luer connector 50 and battery recharger 14 i6 ready to engage power as6i6ter device 10 by insertion of plug 44 into receptacle 42.
When assembled together, power as6ister device 10 and syringe 12, along with handle 18 and trigger 20a-20b, resemble a pistol. This 10 configuration provides for firm hold control and convenient handleability. The power assister device 10 comprises a casing which serves as a housing and chassis for the components contained therein.
Referring to syringe 12, as shown in FIGS. 1, 2, 3 and 9, it 15 comprises: a syringe barrel to receive an injectable agent therein, said syringe barrel having a luer connector 50 at one end thereof serving as means for attaching butterfly needle 13 thereto, and the other end of said tubular body having male coupling 46 to engage female coupling 38.
Flange 52 of syringe 12 locates and fixes syringe within a complimentary 2 0 slot (not shown) in front 16 of the power assister device 10. Loading of syringe 12 is exceptionally easy and practical, since the syringe is drop-loaded onto said slot without the need of any twisting or turning motion.
Positioned in said syringe barrel in a slideable relationship is piston 48 integral with male coupling 46.
As best seen in FIGS. 2, 3, 7 and 8, the casing or housing of the power assister device 10 houses a D.C. motor 22 which produces angular rotation of gear 24. Gear 24 drives gear 26 which has internal thread 28.
Linear movement of lead screw 30 is produced by preventing its rotation 3 0 and by the angular rotation of internal thread 28. A follower 32, fixed to the back end of lead screw 30, prevents rotation of the lead screw during linear movement by the engagement of peg 32a of the follower 32 rolling or sliding in slot 32 b.
20919~ i D. C. motor 22 is powered by rechargeable batteries 40, which are located in handle 18 of power assister device 10. Trigger switch 20 a - 20 b engageably coupled to batteries 40 and D.C. motor 22 has three positions: forward drive, reverse drive and off position. Forward limit S switch 36 is positioned so that lead screw follower 32 triggers the switch and stops the motor when piston 48 is in its extended position as shown in FIG. 4. Likewise, the backwards limit switch 34 is positioned so that the lead screw follower 32 triggers the switch and stops the motor 22 when piston 48 is in its engagement position as shown in FIG. 3.
The power assister device 10 is recharged by plugging recharger 14 in a standard electrical outlet and inserting plug 44 into receptacle 42 - during periods in which the device is not in use.
l S Reference is now made to the operation of the hand-held power assister. The syringe 12 could be prefilled with an injectable liquid, such as contrast media, or the power assister device 10 could be used to fill the syringe. If not prefilled, the empty syringe 12 is loaded onto the front 16 of the device, having male coupling 46 engage female couple 38, then j 2 0 placing the power assister device 10 in an upright position by placing it .1 with is flat surface 9 on top of a flat object, such as a table. The syringe 12 is then filled with contrast media by first driving the piston 48 to its extended position within the syringe as shown in FIG. 4. A plastic tube (not shown) is attached to luer connector 50 and the contrast media is 2 S syphoned into the syringe 12 by placing the opposite end of the plastic tube in a container filled with contrast media and retracting piston 48 back into its engagement position. Upon completion of the process the plastic tube is removed from the luer connector 50 and a butterfly needle 13 is attached thereto. After butterfly needle 13 is attached to luer connector ~0, the upright position of power assister device 10 is maintained until the air from syringe 12 and butterfly needle 13 is purged by driving piston 48 in the forward direction. To drive piston 48 forward or in reverse trigger switch 20a - 20b is provided. Trigger switch 20a - 20b is positioned in handle 18 of the power assister device 10 .. .. .
- : `: ' .: ,, , ... .
209~94~
to control both the forward and reverse motion of the piston: pressing - "
~Ob results in forward motion of piston 48, while pressing 20a results in reverse motion thereof. When neither 20a nor 20b trigger switch is r pressed, switch automatically reverts to neutral or off position and motor 22 becomes disengaged.
In the case when the syringe 12 is prefilled with contrast media, the syringe is loaded in the same manner as above-described, then the power assister 10 is positioned in an upright position. Syringe cap (not l O shown) is removed from luer connector ~0 and butterfly needle 13 is attached to luer connector 50. The air is then purged from the syringe as above-described.
Upon purging the air from syringe 12, the power assister device 10 l 5 is held by the medical practitioner at handle 18 with index finger resting on trigger switch 20a - 20b which is in the off position. Protective sheath (not shown) is removed from butterfly needle 13 and the same is inserted into the injection sight on the patient. The practitioner then activates motor 22 by pressing trigger switch 20b which electrically engages 2 0 batteries 40 with motor 22. Motor 22 produces angular motion which is converted into linear motion through gears 24 and 26 acting on lead screw 30. Lead screw 30 drives piston 48 in the barrel of syringe 12 forcing contrast media through butterfly needle into the injection sight.
Piston 48 is driven by lead screw 30 at a steady rate, while the 2 5 practitioner is able to visually observe the expulsion of the contrast media from syringe 12. The medical practitioner is in complete control of the injection process. Unlike with very expensive and complicated devices where electronics take complete control over the process with the exclusion of the medical practitioner, the instant power assister device 3 0 accomplishes one result: responds to the desire of the practitioner by forcing the contrast media out of syringe 12 into the patient at a steady rate of delivery. The injection process may be interrupted any time upon releasing trigger switch into neutral position. When lead screw 30 is in its completely extended position, that is, piston 48 has completely . .
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20919~
I o discharged contrast media from syringe 12, lead screw follower 32 triggers forward limit switch 36 to stop motor 22.
Upon completing the injection process, butterfly needle 13 is 5 disconnected from the patient and lead screw 30 is retracted to its initial , engagement position. Syringe 12 is disconnected from power assister device 10 by disengaging male coupling 46 from female coupling 38 and disengaging flange 52 from receiving slot on front portion 16 of the device 10.
As is apparent from the foregoing description, the power assister device of the present invention is extremely simple, compact, easy to hold and operate and is inexpensive. The lack of complicated electronic components virtually eliminates failures and breakdowns which plague 15 complicated instruments. Medical personnel have complete control during the use of the device which makes the practice of delivering - contrast media to the patient a more tolerable and pleasant experience than that associated with bulky, complicated instrumentalities.
SUMMARY OF THE INVENTION
The power assister device of the present invention is designed to be hand-held by one hand, light weight, inexpensive and to allow complete control over the process of delivering radiopaque media to the patient by the medical practitioner.
To that end, its configuration resembles a pistol, the handle portion of which provides for firm hold. Activating switch, having on-off- and neutral positions, is located in the handle portion to be controlled by the index finger of the practitioner.
While the device does not incorporate complicated and expensive electronic components which tend to break down and are cumber-some to use, it provides electrical energy to deliver the contrast media to the patient at a constant rate of delivery and it incorporates limit switches to automatically stop the electric motor when the lead screw, which engages the piston, is in its initial or completely extended position.
In accordance with the invention, the hand-held power assister device comprises: a pistol-shaped casing; a syringe having a slideable piston therein, removably coupled to said casing; and drive means, contained in said casing, for driving the piston in said syringe to deliver said liquid to the patient.
The casing is preferably made of light but tough plastic material and safely houses all components which may include: a D.C. motor to provide angular motion; rechargeable batteries to supply electrical power to the motor;recharging means for the batteries; a lead screw having a female engagement means to engage a piston; gear means to translate angular motion 4a produced by the motor to linear motion of the lead screw;limit switches to stop the motor when lead screw is in its initial or completely extended positions; and 20919~5 trigger switch with electrical leads to batteries and to the motor for controlling the movement of the lead screw.
The syringe used in the present invention may be of various sizes, such as from 10 ml to 50 ml to 100 ml or larger, depending on the volume requirement of the patient and the type and concentration of the radiopaque or other media. The syringe has a luer connector at one end to engage a catheter or a butterfly needle which is to be inserted in the injection site. The other end of the syringe is equipped with a flange to engage a receiving slot in the front end of the casing of the hand-held power assister device. The syringe barrel holds a slideable piston or plunger therein and is equipped with a male engagement means to mate with female engagement means of the lead screw.
The recharging means consists of a recharger unit equipped with two plugs one of which is inserted into the receptacle on the power assister device and the other into a standard electrical outlet.
20919~
FIG. 1 is a perspective view of the hand-held power assister, a syringe S engaged with said power assister, butterfly needle in place and battery charger unit;
FIG 2. is a fiectional view of the hand-held power assister;
FIG.3 is a cross-sectional view of the hand-held power assister taken along the line 3-3 of FIG. 2, showing the syringe engaged and the syringe piston in its engagement position.
FIG. 4 is a cross-sectional view of the hand-held power assister, 1 5 showing syringe piston in its extended position, taken along line 3-3 of FIG. 2;
FIG.5 i6 a transverse cross-sectional view of the hand-held power assister and syringe engaged therewith, taken along line 5-5 of FIG.2;
FIG.6 is a partial transverse cross-sectional view of the hand-held assister device taken along line 5-5 of FIG. 2;
S FIG. 7 is a cross-sectional view of the hand-held power assister taken along the line 7-7 of FIG. 2;
FIG.8 is a cross-sectional view of the hand-held power assister taken along the line 8-8 of FIG. 2; and FIG.9 is a perspective view of the syringe not engaged with the power assister.
20919~5 RIPIION ~ THE E~IBO12~T
Referring to FIG. 1, power assister device 10 is shown with syringe 12 engaging said device, butterfly needle 13 attached to said 5 syringe by luer connector 50 and battery recharger 14 i6 ready to engage power as6i6ter device 10 by insertion of plug 44 into receptacle 42.
When assembled together, power as6ister device 10 and syringe 12, along with handle 18 and trigger 20a-20b, resemble a pistol. This 10 configuration provides for firm hold control and convenient handleability. The power assister device 10 comprises a casing which serves as a housing and chassis for the components contained therein.
Referring to syringe 12, as shown in FIGS. 1, 2, 3 and 9, it 15 comprises: a syringe barrel to receive an injectable agent therein, said syringe barrel having a luer connector 50 at one end thereof serving as means for attaching butterfly needle 13 thereto, and the other end of said tubular body having male coupling 46 to engage female coupling 38.
Flange 52 of syringe 12 locates and fixes syringe within a complimentary 2 0 slot (not shown) in front 16 of the power assister device 10. Loading of syringe 12 is exceptionally easy and practical, since the syringe is drop-loaded onto said slot without the need of any twisting or turning motion.
Positioned in said syringe barrel in a slideable relationship is piston 48 integral with male coupling 46.
As best seen in FIGS. 2, 3, 7 and 8, the casing or housing of the power assister device 10 houses a D.C. motor 22 which produces angular rotation of gear 24. Gear 24 drives gear 26 which has internal thread 28.
Linear movement of lead screw 30 is produced by preventing its rotation 3 0 and by the angular rotation of internal thread 28. A follower 32, fixed to the back end of lead screw 30, prevents rotation of the lead screw during linear movement by the engagement of peg 32a of the follower 32 rolling or sliding in slot 32 b.
20919~ i D. C. motor 22 is powered by rechargeable batteries 40, which are located in handle 18 of power assister device 10. Trigger switch 20 a - 20 b engageably coupled to batteries 40 and D.C. motor 22 has three positions: forward drive, reverse drive and off position. Forward limit S switch 36 is positioned so that lead screw follower 32 triggers the switch and stops the motor when piston 48 is in its extended position as shown in FIG. 4. Likewise, the backwards limit switch 34 is positioned so that the lead screw follower 32 triggers the switch and stops the motor 22 when piston 48 is in its engagement position as shown in FIG. 3.
The power assister device 10 is recharged by plugging recharger 14 in a standard electrical outlet and inserting plug 44 into receptacle 42 - during periods in which the device is not in use.
l S Reference is now made to the operation of the hand-held power assister. The syringe 12 could be prefilled with an injectable liquid, such as contrast media, or the power assister device 10 could be used to fill the syringe. If not prefilled, the empty syringe 12 is loaded onto the front 16 of the device, having male coupling 46 engage female couple 38, then j 2 0 placing the power assister device 10 in an upright position by placing it .1 with is flat surface 9 on top of a flat object, such as a table. The syringe 12 is then filled with contrast media by first driving the piston 48 to its extended position within the syringe as shown in FIG. 4. A plastic tube (not shown) is attached to luer connector 50 and the contrast media is 2 S syphoned into the syringe 12 by placing the opposite end of the plastic tube in a container filled with contrast media and retracting piston 48 back into its engagement position. Upon completion of the process the plastic tube is removed from the luer connector 50 and a butterfly needle 13 is attached thereto. After butterfly needle 13 is attached to luer connector ~0, the upright position of power assister device 10 is maintained until the air from syringe 12 and butterfly needle 13 is purged by driving piston 48 in the forward direction. To drive piston 48 forward or in reverse trigger switch 20a - 20b is provided. Trigger switch 20a - 20b is positioned in handle 18 of the power assister device 10 .. .. .
- : `: ' .: ,, , ... .
209~94~
to control both the forward and reverse motion of the piston: pressing - "
~Ob results in forward motion of piston 48, while pressing 20a results in reverse motion thereof. When neither 20a nor 20b trigger switch is r pressed, switch automatically reverts to neutral or off position and motor 22 becomes disengaged.
In the case when the syringe 12 is prefilled with contrast media, the syringe is loaded in the same manner as above-described, then the power assister 10 is positioned in an upright position. Syringe cap (not l O shown) is removed from luer connector ~0 and butterfly needle 13 is attached to luer connector 50. The air is then purged from the syringe as above-described.
Upon purging the air from syringe 12, the power assister device 10 l 5 is held by the medical practitioner at handle 18 with index finger resting on trigger switch 20a - 20b which is in the off position. Protective sheath (not shown) is removed from butterfly needle 13 and the same is inserted into the injection sight on the patient. The practitioner then activates motor 22 by pressing trigger switch 20b which electrically engages 2 0 batteries 40 with motor 22. Motor 22 produces angular motion which is converted into linear motion through gears 24 and 26 acting on lead screw 30. Lead screw 30 drives piston 48 in the barrel of syringe 12 forcing contrast media through butterfly needle into the injection sight.
Piston 48 is driven by lead screw 30 at a steady rate, while the 2 5 practitioner is able to visually observe the expulsion of the contrast media from syringe 12. The medical practitioner is in complete control of the injection process. Unlike with very expensive and complicated devices where electronics take complete control over the process with the exclusion of the medical practitioner, the instant power assister device 3 0 accomplishes one result: responds to the desire of the practitioner by forcing the contrast media out of syringe 12 into the patient at a steady rate of delivery. The injection process may be interrupted any time upon releasing trigger switch into neutral position. When lead screw 30 is in its completely extended position, that is, piston 48 has completely . .
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. ~ . .. .
20919~
I o discharged contrast media from syringe 12, lead screw follower 32 triggers forward limit switch 36 to stop motor 22.
Upon completing the injection process, butterfly needle 13 is 5 disconnected from the patient and lead screw 30 is retracted to its initial , engagement position. Syringe 12 is disconnected from power assister device 10 by disengaging male coupling 46 from female coupling 38 and disengaging flange 52 from receiving slot on front portion 16 of the device 10.
As is apparent from the foregoing description, the power assister device of the present invention is extremely simple, compact, easy to hold and operate and is inexpensive. The lack of complicated electronic components virtually eliminates failures and breakdowns which plague 15 complicated instruments. Medical personnel have complete control during the use of the device which makes the practice of delivering - contrast media to the patient a more tolerable and pleasant experience than that associated with bulky, complicated instrumentalities.
Claims (15)
1. A hand-held power injection device for delivering liquid media to a patient comprising:
a pistol-shaped casing;
a syringe having a slideable piston therein, removably coupled to said casing; and drive means, contained in said casing, for driving the piston in said syringe to deliver said liquid to the patient.
a pistol-shaped casing;
a syringe having a slideable piston therein, removably coupled to said casing; and drive means, contained in said casing, for driving the piston in said syringe to deliver said liquid to the patient.
2. The hand-held power injection device of claim 1 wherein said drive means comprises:
a battery powered motor to generate angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female coupling means.
a battery powered motor to generate angular rotation;
a lead screw rotatably coupled with said motor by gear means to convert angular rotation to linear motion, said lead screw having at one end thereof a female coupling means.
3. The hand-held power injection device of claim 1 wherein said syringe comprises:
a syringe barrel having a luer lock at one end thereof to receive a catheter and a flange at the other end thereof for drop-load engaging said casing; and a piston slideably positioned in said syringe barrel having a male coupling means to engage said female coupling means.
a syringe barrel having a luer lock at one end thereof to receive a catheter and a flange at the other end thereof for drop-load engaging said casing; and a piston slideably positioned in said syringe barrel having a male coupling means to engage said female coupling means.
4. The hand-held power injection device of claim 2 wherein said drive means further comprises a limit switch connected to said lead screw and motor to automatically disengage said motor and prevent further forward driving of he lead screw when the lead screw is at its completely extended position.
5. The hand-held power injection device of claim 2 wherein said drive means further comprises a limit switch connected to said lead screw and motor to automatically disengage said motor and prevent further reverse driving of the lead screw when the lead screw is at its initial position.
6. The hand-held power injection device of claim 2 further comprising a trigger switch connected to said D. C. motor and battery.
7. The hand-held power injection device of claim 3 wherein said syringe is equipped with a butterfly needle attached thereto by said luer lock.
8. The hand-held power injection device of claim 1 wherein said liquid media contains an imaging agent.
9. The hand-held power injection device of claim 8 wherein said imaging agent is for angiographic examination of a mammal.
10. The hand-held power injection device of claim 8 wherein said imaging agent is for urographic examination of a mammal.
11. A method of angiographic examination of a mammal comprising the administration of an angiographic imaging agent to said mammal using the hand-held power injection device of claim 1.
12. A method of urographic examination of a mammal comprising the administration of an urographic imaging agent to said mammal using the hand-held power injection device of claim 1.
13 13. A hand-held power injection device for injecting contrast media into the vascular system of a mammal said device comprising:
a pistol-shaped casing to provide for ease of handling, said casing having a main tubular body portion and a handle portion integral therewith to house and support component parts therein;
a syringe receiving means in said tubular body portion;
a syringe engaging said tubular body portion and containing a piston therein having a male coupling means;
a motor capable of generating angular motion, located in said tubular body portion;
rechargeable batteries located in said handle portion for energizing said motor;
a lead screw, having a female coupling means to mate with said male coupling means of a syringe, said lead screw rotatably coupled with said motor by gear means which convert angular motion to linear motion;
limit switches connected to said lead screw and motor to automatically stop said lead screw when it is in the initial or completely extended position; and a trigger switch connected to said motor and said batteries to control movement of said lead screw coupled to said piston to inject contrast media into the vascular system of a mammal.
a pistol-shaped casing to provide for ease of handling, said casing having a main tubular body portion and a handle portion integral therewith to house and support component parts therein;
a syringe receiving means in said tubular body portion;
a syringe engaging said tubular body portion and containing a piston therein having a male coupling means;
a motor capable of generating angular motion, located in said tubular body portion;
rechargeable batteries located in said handle portion for energizing said motor;
a lead screw, having a female coupling means to mate with said male coupling means of a syringe, said lead screw rotatably coupled with said motor by gear means which convert angular motion to linear motion;
limit switches connected to said lead screw and motor to automatically stop said lead screw when it is in the initial or completely extended position; and a trigger switch connected to said motor and said batteries to control movement of said lead screw coupled to said piston to inject contrast media into the vascular system of a mammal.
14 14. A method of angiographic examination of a mammal comprising the administration of an angiographic imaging agent to said mammal using the hand-held power injection device of claim 13.
15. A method of urographic examination of a mammal comprising the administration of an urographic imaging agent to said mammal using the hand-held power injection device of claim 13.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/871,879 US5269762A (en) | 1992-04-21 | 1992-04-21 | Portable hand-held power assister device |
| US871,879 | 1992-04-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2091945A1 true CA2091945A1 (en) | 1993-10-22 |
Family
ID=25358368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002091945A Abandoned CA2091945A1 (en) | 1992-04-21 | 1993-03-18 | Portable hand-held power assister device |
Country Status (18)
| Country | Link |
|---|---|
| US (1) | US5269762A (en) |
| EP (1) | EP0567186B1 (en) |
| JP (1) | JPH067440A (en) |
| AT (1) | ATE176162T1 (en) |
| AU (1) | AU666930B2 (en) |
| BR (1) | BR9301581A (en) |
| CA (1) | CA2091945A1 (en) |
| CZ (1) | CZ66293A3 (en) |
| DE (1) | DE69323231T2 (en) |
| ES (1) | ES2129066T3 (en) |
| FI (1) | FI931796A (en) |
| HU (1) | HU215073B (en) |
| IL (1) | IL105467A (en) |
| MX (1) | MX9302297A (en) |
| MY (1) | MY109635A (en) |
| NO (1) | NO931444L (en) |
| NZ (1) | NZ247457A (en) |
| SK (1) | SK36693A3 (en) |
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- 1992-04-21 US US07/871,879 patent/US5269762A/en not_active Expired - Lifetime
-
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- 1993-03-18 CA CA002091945A patent/CA2091945A1/en not_active Abandoned
- 1993-04-10 MY MYPI93000664A patent/MY109635A/en unknown
- 1993-04-15 EP EP93201089A patent/EP0567186B1/en not_active Expired - Lifetime
- 1993-04-15 ES ES93201089T patent/ES2129066T3/en not_active Expired - Lifetime
- 1993-04-15 AT AT93201089T patent/ATE176162T1/en not_active IP Right Cessation
- 1993-04-15 DE DE69323231T patent/DE69323231T2/en not_active Expired - Fee Related
- 1993-04-16 CZ CZ93662A patent/CZ66293A3/en unknown
- 1993-04-19 BR BR9301581A patent/BR9301581A/en not_active Application Discontinuation
- 1993-04-20 NO NO93931444A patent/NO931444L/en unknown
- 1993-04-20 SK SK366-93A patent/SK36693A3/en unknown
- 1993-04-20 IL IL105467A patent/IL105467A/en not_active IP Right Cessation
- 1993-04-20 MX MX9302297A patent/MX9302297A/en unknown
- 1993-04-20 AU AU37000/93A patent/AU666930B2/en not_active Ceased
- 1993-04-20 JP JP5093072A patent/JPH067440A/en active Pending
- 1993-04-21 NZ NZ247457A patent/NZ247457A/en unknown
- 1993-04-21 FI FI931796A patent/FI931796A/en not_active Application Discontinuation
- 1993-04-21 HU HU9301174A patent/HU215073B/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8221347B2 (en) | 2004-12-01 | 2012-07-17 | Acushot, Inc. | Needle-free injector |
| US8403888B2 (en) | 2010-04-15 | 2013-03-26 | Teneo Innovations Inc. | Device and electronic controller for syringe piston control |
Also Published As
| Publication number | Publication date |
|---|---|
| SK36693A3 (en) | 1993-11-10 |
| DE69323231D1 (en) | 1999-03-11 |
| HU215073B (en) | 1998-09-28 |
| FI931796A0 (en) | 1993-04-21 |
| NO931444D0 (en) | 1993-04-20 |
| AU3700093A (en) | 1993-10-28 |
| US5269762A (en) | 1993-12-14 |
| CZ66293A3 (en) | 1993-11-17 |
| HU9301174D0 (en) | 1993-08-30 |
| NZ247457A (en) | 1996-03-26 |
| JPH067440A (en) | 1994-01-18 |
| MY109635A (en) | 1997-03-31 |
| FI931796A (en) | 1993-10-22 |
| EP0567186B1 (en) | 1999-01-27 |
| IL105467A (en) | 1997-06-10 |
| NO931444L (en) | 1993-10-22 |
| ES2129066T3 (en) | 1999-06-01 |
| DE69323231T2 (en) | 1999-06-17 |
| ATE176162T1 (en) | 1999-02-15 |
| HUT73508A (en) | 1996-08-28 |
| BR9301581A (en) | 1993-10-26 |
| AU666930B2 (en) | 1996-02-29 |
| IL105467A0 (en) | 1993-08-18 |
| MX9302297A (en) | 1994-02-28 |
| EP0567186A1 (en) | 1993-10-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |