US3631847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for injecting fluid into the vascular system
Assignee: Individual
•
Filing: 1969-03-25
•
Granted: 1972-01-04
•
Expires: 1989-03-25
Abstract
Abstract A method for use in the study and diagnosis of vascular systems in which liquids of a wide range of viscosities and for various purposes may be injected into such a system at constant predetermined rates and volumes. Apparatus to inject radiopaque fluid into a vascular system comprising a syringe, a plunger in the syringe, a catheter connecting the syringe to the vascular system, means to move the plunger in the syringe, and means to measure and control the speed of the plunger in the syringe throughout the period of injection.
Inventors
- 👤 James C Hobbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:34
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/48; A61B6/481; A61B5/00; A61B5/02; A61B5/026; A61B5/0275; A61B5/02755; A61B6/50; A61B6/504; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/168; A61M5/16831; A61M5/16854
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
136 words
The method of injecting radiopaque fluids into the vascular system of a human being which comprises the steps of: a. placing a quantity of a radiopaque fluid in a syringe having a plunger, b. connecting one end of the syringe to a catheter to receive fluid expelled from the syringe, c. inserting the other end of the catheter into the vascular system of a human being, d. exerting sufficient force on the plunger to expel the fluid through said catheter and inject the fluid into said vascular system, and e. maintaining a preselected constant rate of injection by continuously monitoring and maintaining constant the speed of the plunger advance in the syringe during the time of injection of fluid, said monitoring being the result of a signal automatically generated by control means connected to said syringe.
Claim 2
Independent Claim
136 words
The method of injecting radiopaque fluids into the vascular system of a human being which comprises the steps of: a. placing a quantity of a radiopaque fluid in a syringe having a plunger, b. connecting one end of the syringe to a catheter to receive fluid expelled from the syringe, c. inserting the other end of the catheter into the vascular system of a human being, d. exerting sufficient force on the plunger to expel the fluid through said catheter and inject the fluid into said vascular system, and e. maintaining a preselected constant rate of injection by continuously monitoring and maintaining constant the speed of the plunger advance in the syringe during the time of injection of fluid, said monitoring being the result of a signal automatically generated by control means connected to said syringe.
Claim 3
Dependent Claim
19 words
The method set out in claim 1 in which said rate is continued for a predetermined period of time.
Claim 4
Dependent Claim
17 words
The method set out in claim 1 in which a predetermined volume of the fluid is expelled.
Claim 5
Dependent Claim
25 words
The method set out in claim 1 in which the force is repeatedly applied and interrupted so that the flow of the fluid is pulsating.
Claim 6
Dependent Claim
41 words
The method set out in claim 1 in which a signal corresponding to the predetermined rate of injection is generated and a feedback signal corresponding to the actual rate of injection is generated and the two signals are maintained in balance.
Claim 7
Dependent Claim
123 words
Apparatus for injecting radiopaque fluids into the vascular system of a mammal comprising: a. a syringe assembly including a cylinder to contain a radiopaque fluid, a plunger movable endwise therein to expel said fluids, b. a frame assembly supporting said syringe assembly, c. a power cylinder assembly operatively connected to said frame assembly and to said plunger, d. a motive power assembly including a motor operatively connected to said power cylinder assembly for moving said plunger at a constant predetermined speed, and e. means operatively connected to said motive power assembly to generate a plunger speed-indicating signal to control the speed of the motor whereby the discharge rate of said fluid is maintained constant independently of fluid pressure variations in the syringe assembly.
Claim 8
Dependent Claim
123 words
Apparatus for injecting radiopaque fluids into the vascular system of a mammal comprising: a. a syringe assembly including a cylinder to contain a radiopaque fluid, a plunger movable endwise therein to expel said fluids, b. a frame assembly supporting said syringe assembly, c. a power cylinder assembly operatively connected to said frame assembly and to said plunger, d. a motive power assembly including a motor operatively connected to said power cylinder assembly for moving said plunger at a constant predetermined speed, and e. means operatively connected to said motive power assembly to generate a plunger speed-indicating signal to control the speed of the motor whereby the discharge rate of said fluid is maintained constant independently of fluid pressure variations in the syringe assembly.
Claim 9
Dependent Claim
37 words
The combination of elements set forth in claim 6 in which the power cylinder assembly includes a cylinder, a threaded rod in and connected to said cylinder and connected at one end to said motive power assembly.
Claim 10
Dependent Claim
32 words
The combination of elements set forth in claim 6 in which a stop nut is adjustably screw threaded on said plunger to limit the endwise movement of said plunger in one direction.
Claim 11
Dependent Claim
60 words
The combination of elements in claim 6 in which the frame assembly includes at least two rods on opposite sides of said syringe and having the centerlines thereof parallel to and in the same plane as the centerline of syringe to support the syringe assembly and a nut on each rod to engage and clamp the syringe assembly in place.
Claim 12
Dependent Claim
32 words
The combination of elements set forth in claim 6 in which the motive power assembly includes a variable speed direct current motor and means for controlling the speed of the said motor.
Claim 13
Dependent Claim
117 words
Apparatus for injecting fluid into a mammular vascular system comprising: a. a syringe assembly including a cylinder to contain a fluid to be injected, a plunger therein, and an endwise movable stem connected to said plunger, b. a source of electric power, c. an electric motor operatively connected to said source and said stem, d. means operatively connected to said motor to monitor and control the speed of said motor aT a constant preselected speed while injecting said fluid by continuously varying the power supplied to the motor to maintain a predetermined rate of discharge of said fluid, e. a manually operated switch to start said motor, and f. an automatically operated switch to stop said motor.
Claim 14
Dependent Claim
117 words
Apparatus for injecting fluid into a mammular vascular system comprising: a. a syringe assembly including a cylinder to contain a fluid to be injected, a plunger therein, and an endwise movable stem connected to said plunger, b. a source of electric power, c. an electric motor operatively connected to said source and said stem, d. means operatively connected to said motor to monitor and control the speed of said motor aT a constant preselected speed while injecting said fluid by continuously varying the power supplied to the motor to maintain a predetermined rate of discharge of said fluid, e. a manually operated switch to start said motor, and f. an automatically operated switch to stop said motor.
Claim 15
Dependent Claim
20 words
The combination of elements set forth in claim 11 in which said automatically operated switch is adjustable as to location.
Claim 16
Dependent Claim
29 words
The combination of elements set forth in claim 11 in which the said automatically operated switch is a relay switch that opens when an undesirable electrical hazard is detected.
Claim 17
Dependent Claim
36 words
The combination of elements set forth in claim 11 in which said manually operated switch is connected to and energizes an auxiliary circuit for apparatus to record the distribution of said fluid in said vascular system.
Claim 18
Independent Claim
100 words
The method of injecting radiopaque liquids into the vascular system of a human being which comprises the steps of a. exerting sufficient force on a plunger in a syringe to expel radiopaque liquid from said syringe and into such a vascular system, and b. maintaining a predetermined constant rate of injection of the liquid by continuously monitoring the forward speed of the plunger to maintain constant the speed of the plunger advance in the syringe during the time of injection of the liquid, said monitoring being the result of a signal automatically generated by control means connected to said syringe.
Claim 19
Independent Claim
100 words
The method of injecting radiopaque liquids into the vascular system of a human being which comprises the steps of a. exerting sufficient force on a plunger in a syringe to expel radiopaque liquid from said syringe and into such a vascular system, and b. maintaining a predetermined constant rate of injection of the liquid by continuously monitoring the forward speed of the plunger to maintain constant the speed of the plunger advance in the syringe during the time of injection of the liquid, said monitoring being the result of a signal automatically generated by control means connected to said syringe.
Claim 20
Dependent Claim
19 words
The method set out in claim 15 in which said rate is continued for a predetermined period of time.
Claim 21
Dependent Claim
17 words
The method set out in claim 15 in which a predetermined volume of the liquid is expelled.
Claim 22
Dependent Claim
25 words
The method set out in claim 15 in which the force is repeatedly applied and interrupted so that the flow of the fluid is pulsating.
Claim 23
Dependent Claim
41 words
The method set out in claim 15 in which a signal corresponding to the predetermined rate of injection is generated and a feedback signal corresponding to the actual rate of injection is generated and the two signals are maintained in balance.
Claim 24
Independent Claim
134 words
The method of injecting radiopaque fluids into the human vascular system which comprises the steps of: a. placing a quantity of radiopaque fluid in a motor driven syringe having a plunger, b. connecting one end of the syringe to a catheter to receive fluid expelled from the syringe, c. inserting the other end of the catheter into the human vascular system, d. generating a first signal corresponding to the desired rate of flow of said radiopaque fluid out of said syringe, e. generating a feedback signal corresponding to the actual rate of flow of said fluid, and f. combining the two said signals, said combination of signals serving to operate the motor of said motor driven syringe so that said radiopaque fluid is injected into the vascular system at a constant rate of flow.
Claim 25
Independent Claim
134 words
The method of injecting radiopaque fluids into the human vascular system which comprises the steps of: a. placing a quantity of radiopaque fluid in a motor driven syringe having a plunger, b. connecting one end of the syringe to a catheter to receive fluid expelled from the syringe, c. inserting the other end of the catheter into the human vascular system, d. generating a first signal corresponding to the desired rate of flow of said radiopaque fluid out of said syringe, e. generating a feedback signal corresponding to the actual rate of flow of said fluid, and f. combining the two said signals, said combination of signals serving to operate the motor of said motor driven syringe so that said radiopaque fluid is injected into the vascular system at a constant rate of flow.
Claim 26
Dependent Claim
19 words
The method as in claim 20 wherein said feedback signal is derived by continuously monitoring the forward plunger speed.
Claim 27
Dependent Claim
122 words
Apparatus for injecting radiopaque fluids into the vascular system of a mammal comprising: a. a syringe assembly including a cylinder to contain a radiopaque fluid, a plunger movable endwise therein to expel said fluids, b. a casing assembly supporting said syringe assembly, c. a power cylinder assembly operatively connected to said casing assembly and to said plunger, d. a motive power assembly including a motor, operatively connected to said power cylinder assembly for moving said plunger at a constant predetermined speed, and e. means operatively connected to said power assembly to generate a plunger speed-indicating signal to control the speed of the motor whereby the discharge rate of said fluid is maintained constant independently of fluid pressure variations in the syringe assembly.
Claim 28
Dependent Claim
122 words
Apparatus for injecting radiopaque fluids into the vascular system of a mammal comprising: a. a syringe assembly including a cylinder to contain a radiopaque fluid, a plunger movable endwise therein to expel said fluids, b. a casing assembly supporting said syringe assembly, c. a power cylinder assembly operatively connected to said casing assembly and to said plunger, d. a motive power assembly including a motor, operatively connected to said power cylinder assembly for moving said plunger at a constant predetermined speed, and e. means operatively connected to said power assembly to generate a plunger speed-indicating signal to control the speed of the motor whereby the discharge rate of said fluid is maintained constant independently of fluid pressure variations in the syringe assembly.
Claim 29
Dependent Claim
13 words
The apparatus as in claim 22 wherein said signal-generating means is a tachometer-generator.
Claim 30
Dependent Claim
123 words
Apparatus for injecting fluid into a mammular vascular system comprising: a. a syringE assembly including a cylinder to contain a fluid to be injected, a plunger therein, and an endwise movable stem connected to the plunger, b. an electric motor operatively connected to said stem and adapted to be connected to a source of electricity, c. means operatively connected to said motor to monitor and control the speed of said motor at a constant preselected speed while injecting said fluid by continuously varying the power supplied to the motor to maintain a predetermined rate of discharge of said fluid, and d. means operatively connected to the motor to automatically terminate the injection when a condition dangerous to the patient exist within said apparatus.
Claim 31
Dependent Claim
123 words
Apparatus for injecting fluid into a mammular vascular system comprising: a. a syringE assembly including a cylinder to contain a fluid to be injected, a plunger therein, and an endwise movable stem connected to the plunger, b. an electric motor operatively connected to said stem and adapted to be connected to a source of electricity, c. means operatively connected to said motor to monitor and control the speed of said motor at a constant preselected speed while injecting said fluid by continuously varying the power supplied to the motor to maintain a predetermined rate of discharge of said fluid, and d. means operatively connected to the motor to automatically terminate the injection when a condition dangerous to the patient exist within said apparatus.
References Cited (Backward Citations)
US2627270A
Cited
US2602446A
Cited
US2690178A
Cited
US2896621A
Cited
US3156236A
Cited
US3155090A
Cited
US3252623A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |