INFUSION PUMP

• US 3,771,694 A
• Filed: 07/07/1972
• Issued: 11/13/1973
• Est. Priority Date: 07/07/1972
• Status: Expired due to Term

• Current Assignee: Arthur P. Kaminski
• Original Assignee: Arthur P. Kaminski
• Inventors: Kaminski, Arthur P.
• Primary Examiner(s): Tollberg, Stanley H.
• Application Number:
  US05/269,707
• Time in Patent Office: 494 Days
• Field of Search: 222/309,70,76 128/214C,218P,214F,214E,DIG.12,DIG.13
• US Class Current: 222/644
• CPC Class Codes: A61M 5/1456 with a replaceable reservoir comprising a piston rod to be moved into the reservoir, e.g. the piston rod is part of the removable reservoir
• CPC Class Codes: G01F 11/029 provided with electric controlling means G01F11/022 and G01F11/024 take precedence
• CPC Class Codes: Y10S 128/13 Infusion monitoring

Abstract

A constant displacement infusion pump for administering medicinal fluid to a patient and means for controllably operating the pump such that the pump is caused to intermittently dispense medicinal fluid with the amount of each dosage dispensation variable in accordance with a first signal and the duration between successive dosage dispensations variable in accordance with a second signal.

Claims

1. In infusion pump apparatus for controllably administering the injection of medicinal fluid into a patient, the combination comprising infusion pump means for dispensing medicinal fluid, drive means comprising a D. C. motor, means operatively coupling said drive means with said pump means, operating means for operating said drive means, said operating means comprising first circuit means for alternately and repetitively generating first and second signals, each of said signals having a variable characteristic, and second circuit means operatively coupling said first circuit means and said drive means such that said drive means is operated in accordance with said first and second signals to cause the pump means to dispense dosages of medicinal fluid with the amount of each dosage dispensation variable in accordance with the characteristic of the first signal and the duration between successive dosage dispensations variable in accordance with the characteristic of the second signal, said first circuit means comprising means for repetitively generating a direct current of fixed duration and variable amplitude, with said amplitude representing the variable characteristic of said first signal and means for varying the duration between successive generations of said direct current, with said duration between successive generations of direct current representing the variable characteristic of said second signal and said second circuit means comprising means for supplying said direct current to said motor.

2. In infusion pump apparatus for controllably administering the injection of medicinal fluid into a patient, the combination comprising infusion pump means for dispensing medicinal fluid, drive means comprising a D. C. motor, means operatively coupling said drive means with said pump means, operating means for operating said drive means, said operating means comprising first circuit means for alternately and repetitively generating first and second signals, each of said signals having a variable characteristic, and second circuit means operatively coupling said first circuit means and said drive means such that said drive means is operated in accordance with said first and second signals to cause the pump means to dispense dosages of medicinal fluid with the amount of each dosage dispensation variable in accordance with the characteristic of the first signal and the duration between successive dosage dispensations variable in accordance with the characteristic of the second signal, said first circuit means comprising means for repetitively generating a direct current of variable duration and fixed amplitude, with said duration representing the variable characteristic of said first signal and means for varying the duration between successive generations of said direct current, with said duration between successive generations of said direct current representing the variable characteristic of said second signal and said second circuit means comprising means for supplying said direct current to said motor.

3. In infusion pump apparatus for controllably administering the injection of medicinal fluid into a patient, the combination comprising infusion pump means for dispensing medicinal fluid, drive means, means operatively coupling said drive means with said pump means, operating means for operating said drive means, said operating means comprising first circuit means for alternately and repetitively generating first and second signals, each of said signals having a variable characteristic, and second circuit means operatively coupling said first circuit means and said drive means such that said drive means is operated in accordance with said first and second signals to cause the pump means to dispense dosages of medicinal fluid with the amount of each dosage dispensation variable in accordance with the characteristic of the first signal and the duration between successive dosage dispensations variable in accordance with the characteristic of the second signal, said first circuit means comprising generating circuit means for generating a waveform alternating between high and low levels, said first signal corresponding to one of said levels and said second signal corresponding to the other of said levels.

4. The combination of claim 3 wherein said drive means comprises a D. C. motor.

5. The combination of claim 3 wherein said generating circuit means comprises means for generating a square wave waveform alternating between said high and low levels, said first signal corresponding to the duration of said square wave waveform at said one level, and said second signal corresponding to the duration of said square wave waveform at said other level.

6. The combination of claim 5 wherein said second circuit means comprises switching means responsive to one of said levels for operating said drive means.

7. In an infusion pump apparatus of the type wherein an infusion pump is controllably operated to controllably dispense fluid the combination comprising a D.C. motor, a D.C. battery, multivibrator circuit means for developing a square wave signal, including means for varying the length of time the square wave signal remains at one level, switching circuit means operably coupling said motor with said battery and responsive to said square wave signal for blocking current flow from the battery to the motor when the square wave signal is at the one level and for conducting current from the battery when the square wave signal is at the other level and means for varying a selected parameter of the current flow from the battery to the motor.

8. The combination of claim 7 wherein said means for varying a selected parameter of the current flow from the battery to the motor comprises means for varying the amplitude of said current.

9. The combination of claim 7 wherein said means for varying a selected parameter of the current flow from the battery to the motor comprises means for varying the duration of said current.

10. The combination of claim 7 wherein said means for varying a selected parameter of the current flow from the battery to the motor comprises variable resistance means operatively associated with said multivibrator circuit means for varying the length of time the square wave signal remains at the other level.

11. The combination of claim 7 wherein said means for varying a selected parameter of the current flow from the battery to the motor comprises variable resistance means operatively associated with said motor for varying the magnitude of current flow from the battery to the motor.

12. The combination of claim 7 wherein said means for varying the length of time the square wave signal remains at the one level comprises variable resistance means operatively associated with said multivibrator circuit means.

13. The combination of claim 7 wherein said multivibrator circuit means comprises first and second transistors, means operatively coupling the output of the first transistor with the input of the second transistor, means coupling the output of the second transistor with the input of the first transistor, said means for varying the length of time the square wave signal remains at the one level comprising variable resistance means operatively associated with one of said coupling means.

14. The combination of claim 13 wherein said means for varying a selected parameter of the current value from the battery to the motor comprises variable resistanCe means operatively associated with the other of said coupling means.

15. The combination of claim 7 further including a second D.C. battery, said second battery being operatively coupled with said multivibrator circuit means for supplying the power requirements of said multivibrator circuit means, said first battery being isolated from said multivibrator circuit means.