US3623474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angiographic injection equipment
Assignee: Bayer Medical Care Inc
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Filing: 1966-07-25
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Granted: 1971-11-30
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Expires: 1986-07-25
Abstract
Abstract An angiographic injector system for producing a controlled rate of flow of injection fluid is described. The injector has a motor-driven piston for ejecting fluid from a syringe cartridge contained within a pressure jacket. The drive motor is operated in accordance with a command voltage which is proportional to the desired rate of flow. Sensing means detects the actual rate of flow and comparison means provides an error signal which controls the motor. Compensating means allow a single control system to operate the drive motor in conjunction with syringes of various sizes, and a tripping circuit halts the motor if the flow rate exceeds the selected rate.
Inventors
- 👤 Marlin S Heilman
- 👤 Donald Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:34
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/50; A61B6/504; A61M; A61M5/00; A61M5/14; A61M5/142; A61M5/145; A61M5/1452; A61M5/14546; A61B6/48; A61B6/481; A61M2005/14553; A61M5/14566
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
186 words
In an injector system for producing a controlled rate of flow of injection fluid for use in angiography and having an injector including syringe means for said fluid, movable piston means for ejecting said fluid from said syringe means, a drive motor for moving said piston, electrical control means including command means for producing a command signal which is a function of a desired rate of fluid flow, sensing means for producing a second signal which is a function of the actual injection flow of said fluid, and means for comparing said command and second signals to produce a resultant signal for operating said drive motor at a selectable, controlled rate to produce a desired flow of fluid whereby the rate of flow of said injection fluid will be substantially independent of flow-attenuating factors in the path of said fluid, the improvement comprising electrical Circuit means responsive to said control means for stopping said drive motor and thereby automatically terminating the flow of said fluid upon the occurrence of a condition within said system that could result in an excessive rate of flow of said fluid.
Claim 2
Dependent Claim
186 words
In an injector system for producing a controlled rate of flow of injection fluid for use in angiography and having an injector including syringe means for said fluid, movable piston means for ejecting said fluid from said syringe means, a drive motor for moving said piston, electrical control means including command means for producing a command signal which is a function of a desired rate of fluid flow, sensing means for producing a second signal which is a function of the actual injection flow of said fluid, and means for comparing said command and second signals to produce a resultant signal for operating said drive motor at a selectable, controlled rate to produce a desired flow of fluid whereby the rate of flow of said injection fluid will be substantially independent of flow-attenuating factors in the path of said fluid, the improvement comprising electrical Circuit means responsive to said control means for stopping said drive motor and thereby automatically terminating the flow of said fluid upon the occurrence of a condition within said system that could result in an excessive rate of flow of said fluid.
Claim 3
Dependent Claim
44 words
The system of claim 1, wherein said circuit means is responsive to an overrate condition, said circuit comprising means for producing a threshold signal in response to said overrate condition and gating means responsive to said threshold signal for thereupon disabling said drive motor.
Claim 4
Dependent Claim
26 words
The system of claim 2, wherein said means for producing a threshold signal comprises potentiometer means connected to said command means and to said sensing means.
Claim 5
Dependent Claim
49 words
The system of claim 3, wherein said potentiometer means comprises a nonlinear resistor having a first movable arm, said first arm being electrically connected to said gating means, said command means including a linear potentiometer having a second movable arm, said first and second movable arms being mechanically interconnected.
Claim 6
Dependent Claim
59 words
The injector system of claim 4, wherein said circuit means further includes normally closed relay means for controlling said drive motor, and silicon controlled rectifier means in series with said relay means, said rectifier means being connected to and responsive to the operation of said gating means to open said normally closed relay means to deenergize said drive motor.
Claim 7
Dependent Claim
47 words
The injector system of claim 1, wherein said control means is mounted in a control cabinet separate from said injector, said control means being connected to said injector through flexible electrical conductor means, said injector being sufficiently small and compact to facilitate use as a hand-held unit.
Claim 8
Dependent Claim
33 words
The injector system of claim 6, wherein the drive motor for said injector is a direct current, permanent magnet, torque-type motor having a printed circuit armature to provide a small, lightweight, compact injector.
Claim 9
Dependent Claim
61 words
The injector system of claim 1, the improvement further comprising signal generator means responsive to the operation of said motor for producing said second signal, and scale factor means for maintaining said second signal proportional to the injection flow of said fluid for various cross sections of said syringe means, whereby said system can be used with a variety of syringes.
Claim 10
Dependent Claim
17 words
The injector system of claim 8, wherein said scale factor means comprises selectively variable voltage divider means.
Claim 11
Dependent Claim
72 words
The injector system of claim 1, the improvement further comprising signal generator means on said injector responsive to the operation of said motor for producing said second signal, and said control means further including generator compensating means connected to said generator for maintaining said second signal proportional to the injection flow of fluid for various injectors and their corresponding signal generators, whereby said system may be used with a variety of injectors.
Claim 12
Dependent Claim
43 words
The injector system of claim 10, further including scale factor means for maintaining said second signal proportional to the injection flow of said fluid for various cross sections of said syringe means, whereby said system can be used with a variety of syringes.
Claim 13
Dependent Claim
120 words
The injector system of claim 1, the improvement further comprising housing means for said injector and threaded shaft means within said housing mechanically connected to said drive motor for rotation therewith, ball nut means engaging the threads of said threaded shaft, means mounted in said housing for preventing said ball nut from rotating, where by rotation of said drive motor moves said ball nut along the axis of said threaded shaft, piston tube means extending along the length of said threaded shaft and having an end portion extending beyond the end of said threaded shaft, said end portion abutting said piston to drive said piston along the axis of said syringe in response to the movement of said ball nut.
Claim 14
Dependent Claim
65 words
The injector system of claim 12, said injector further including removabLe connector means between said end portion of said piston tube and said piston, whereby said piston tube can be connected to said piston for driving said piston in two directions, said piston tube being normally disconnected to permit said piston to be driven only in a direction to eject said fluid from said syringe.
Claim 15
Dependent Claim
36 words
The injector system of claim 13 wherein said sensing means further includes compensating means for maintaining said second signal proportional to said rate of flow for various mechanical linkages between said drive motor and said piston.
Claim 16
Dependent Claim
147 words
The injector system of claim 1, the improvement further comprising disposable syringe means for said injector, said disposable syringe means including a disposable cartridge containing said fluid to be ejected and a transparent pressure jacket adapted to receive said cartridge and said piston means, said pressure jacket preventing deformation of said cartridge when said system is operative to apply pressure to said fluid to produce said fluid flow, a housing for supporting said piston means, and means for removably connecting said disposable syringe means to said housing, said last-named means including retainer means threadedly engaging said housing and having a central aperture adapted to receive said pressure jacket, said pressure jacket having a peripheral shoulder against which said retainer means abuts to hold said pressure jacket and housing in assembled relationship, whereby said pressure jacket can be removed from said housing for replacement of said disposable cartridge.
Claim 17
Dependent Claim
36 words
The injector system of claim 15, further including electrically insulating means interposed between said housing and said syringe and said syringe means being electrically nonconductive, whereby electric potentials on said housing are isolated from said fluid.
Claim 18
Dependent Claim
44 words
The injector system of claim 15, wherein said piston means comprises a piston head support and a flexible piston cap mounted on said support, said cap being replaceable to permit said piston means to be adapted to the internal diameter of said syringe means.
Claim 19
Dependent Claim
61 words
The injector system of claim 17, the improvement further comprising signal generator means responsive to the operation of said motor for producing said second signal, and scale factor means for maintaining said second signal proportional to the injection flow of said fluid for various cross sections of said syringe means, whereby said system can be used with a variety of syringes.
Claim 20
Dependent Claim
35 words
The injector system of claim 1, the improvement further comprising means for producing a voltage proportional to the output torque of said drive motor, whereby the pressure developed in said injection fluid can be monitored.
Claim 21
Dependent Claim
47 words
The injector system of claim 19, wherein said means for producing a voltage proportional to the output torque of said drive motor comprises a resistor in series with the armature of said motor, said voltage being measured across said resistor and being proportional to said fluid pressure.
Claim 22
Dependent Claim
28 words
The injector system of claim 20, wherein said drive motor is a direct current, permanent magnet, torque-type motor having a printed circuit armature for moving said piston means.
Claim 23
Dependent Claim
181 words
In an injector system for producing a controlled rate of flow of injection fluid for use in angiography and having an injector including syringe means for said fluid, movable piston means for ejecting said fluid from said syringe means, a drive motor for moving said piston, electrical control means including command means for producing a command signal which is a function of a desired rate of fluid flow, sensing means for producing a second signal which is a function of the actual injection flow of said fluid, and means for comparing said command and second signals to produce a resultant signal for operating said drive motor at a selectable, controlled rate to produce a desired flow of fluid whereby the rate of flow of said injection fluid will be substantially independent of flow-attenuating factors in the path of said fluid, thE improvement comprising electric circuit means including a resistor connected to said drive motor for producing a voltage proportional to the output torque of said drive motor, said voltage being measured across said resistor and being proportional to said fluid pressure.
Claim 24
Dependent Claim
181 words
In an injector system for producing a controlled rate of flow of injection fluid for use in angiography and having an injector including syringe means for said fluid, movable piston means for ejecting said fluid from said syringe means, a drive motor for moving said piston, electrical control means including command means for producing a command signal which is a function of a desired rate of fluid flow, sensing means for producing a second signal which is a function of the actual injection flow of said fluid, and means for comparing said command and second signals to produce a resultant signal for operating said drive motor at a selectable, controlled rate to produce a desired flow of fluid whereby the rate of flow of said injection fluid will be substantially independent of flow-attenuating factors in the path of said fluid, thE improvement comprising electric circuit means including a resistor connected to said drive motor for producing a voltage proportional to the output torque of said drive motor, said voltage being measured across said resistor and being proportional to said fluid pressure.
Claim 25
Dependent Claim
33 words
The injector system of claim 22, wherein said drive motor is a direct current permanent magnet, to torque-type motor having a printed circuit armature, said resistor being connected in series with said armature.
Claim 26
Dependent Claim
59 words
The injector system of claim 22, wherein said syringe means is electrically nonconductive and includes a disposable cartridge and a transparent pressure jacket adapted to receive said cartridge, said cartridge containing a prepackaged quantity of said fluid to be ejected, and said pressure jacket holding said cartridge in operative position while said injecting pressure is generated in said cartridge.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |