Dynamic range motor for a pump device

• US 8,360,737 B2
• Filed: 08/07/2007
• Issued: 01/29/2013
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Smisson-Cartledge Biomedical LLC
• Original Assignee: Smisson-Cartledge Biomedical LLC
• Inventors: Smisson, Hugh F. III, Cartledge, Richard G., Field, David C., Lewis, Harvey A. Jr., York, Frederick J.
• Primary Examiner(s): FREAY, CHARLES GRANT
• Application Number:
  US11/835,118
• Publication Number:
  US 20080145249A1
• Time in Patent Office: 2,002 Days
• Field of Search: 417/44.1, 417/477.1, 417/477.2, 62/32, 62/33, 165/185, 604/113, 604/122
• US Class Current: 417/44.1
• CPC Class Codes: A61M 1/0281 Apparatus for treatment of blood or blood constituents prior to transfusion, e.g. washing, filtering or thawing
• CPC Class Codes: A61M 2205/127 with provisions for heating or cooling
• CPC Class Codes: A61M 2206/10 Flow characteristics
• CPC Class Codes: A61M 2206/14 Static flow deviators in tubes disturbing laminar flow in tubes, e.g. archimedes screws
• CPC Class Codes: A61M 5/16831 Monitoring, detecting, signalling or eliminating infusion flow anomalies low-level float-valves causing cut-off A61M5/40; indicating or recording presence, absence or direction of flow in general G01P13/0066
• CPC Class Codes: A61M 5/172 electrical or electronic A61M5/16804, A61M5/16831 take precedence
• CPC Class Codes: A61M 5/36 with means for eliminating or preventing injection or infusion of air into body dialysis systems, blood oxygenators A61M1/14; haemofiltration equipment A61M1/34; automatic tube cut-off A61M39/281
• CPC Class Codes: A61M 5/365 Air detectors A61M5/1684 takes precedence; in extracorporeal blood circuits A61M1/3626
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media

Abstract

A pump system selectably and dynamically controls the flow rate of a fluid being delivered to a patient'"'"'s body over a wide range of flow rates. The pump system includes an infusion tubing, a pumping mechanism, a motor drive assembly in mechanical communication with the pumping mechanism, a user input control, and an electronic controller in electrical communication with and at least partially controlling the motor drive assembly. The electronic controller include a digital signal processing controller in electrical communication with the motor drive assembly that is configured to receive a signal from the user input control and to cause power to be supplied to the motor drive assembly in response at least partially to the signal from the user input control. The pump system may selectably deliver fluid at rates from about 1 milliliter per hour to at least about 3000 milliliters per minute.

Claims

1. A pump system comprising:

an infusion tubing;

a pumping mechanism;

a motor drive assembly in mechanical communication with said pumping mechanism;

a user input control;

an electronic controller in electrical communication with and at least partially controlling said motor drive assembly; and

a disposable heat exchanger cartridge removably coupled under pressure to at least one of a heating element or a cooling element;

wherein;

said electronic controller comprises a digital signal processing controller in electrical communication with said motor drive assembly;

said digital signal processing controller is configured to receive a signal from said user input control and to cause power to be supplied to said motor drive assembly in response at least partially to said signal from said user input control;

said disposal heat exchanger cartridge comprises a first half constructed from thermally conductive material correspondingly mating with said heating or cooling element;

a second half constructed from thermally conductive material opposite said first half; and

an internal heat exchange zone existing between said first half and said second half, wherein fluid flows therethrough;

said heating or cooling element further comprises at least one thermoelectric heat pump and selectable creates at least one heat point or at least cooling point on the heating and cooling element;

said disposal heat exchanger cartridge is configured to receive and pass therethrough fluid from said infusion tubing as a result of the operation of said pumping mechanism, and

said pump system selectably delivers fluid at rates from about 1 milliliter per hour to at least about 3000 milliliters per minute.

2. The pump system of claim 1, wherein said digital signal processing controller comprises a high resolution digital signal processing controller comprising between an approximately 16-bit to an approximately 64-bit registry.

3. The pump system of claim 1, further comprising a motor power drive circuitry in electrical communication with said digital signal processing controller and with said motor drive assembly, wherein said digital signal processing controller is configured to send to said motor power drive circuitry a pulse-width modulation signal that causes said power motor drive circuitry to apply a predetermined level of voltage intermittently to said motor drive assembly.

4. The pump system of claim 1, wherein said digital signal processing controller further comprises a Proportional Integral Derivative filter comprising between approximately 8-bit to approximately 24-bit coefficients.

5. The pump system of claim 1, further comprising at least one of a tachometer or an encoder in communication with said motor drive assembly and said digital signal processing controller, wherein said tachometer or encoder communicates the speed of said motor drive assembly to said digital signal processing controller.

6. The pump system of claim 5, comprising a high resolution tachometer having between approximately 250 lines of resolution to approximately 1000 lines of resolution.

7. The pump system of claim 1, wherein:

said motor drive assembly comprises a DC motor mechanically coupled to a gearbox and in electrical communication with said electronic controller; and

said gearbox is mechanically coupled to said pumping mechanism.

8. The pump system of claim 7, wherein said motor drive assembly comprises a single DC motor.

9. The pump system of claim 7, wherein said pumping mechanism comprises one of a roller head pump, a non-circular peristaltic pump, a centrifugal pump, or an impeller.

10. The pump system of claim 7, wherein said pumping mechanism comprises a roller head pump comprising at least two rollers in communication with said infusion tubing.

11. The pump system of claim 1, wherein said pumping mechanism comprises a roller head pump, and said disposable heat exchanger cartridge houses said infusion tubing, wherein:

said infusion tubing is secured to at least a first point on said disposable heat exchanger cartridge before said infusion tubing communicates with said roller head pump and at least a second point on said disposable heating cartridge after said infusion tubing communicates with said roller head pump; and

said securing said infusion tubing to said disposable heating cartridge maintains a substantially constant length and a substantially constant tension of the portion of said infusion tubing in communication with said roller head pump so as to reduce variability in pressure and flow rates.

12. The pump system of claim 1, wherein said electronic controller increments or decrements infusion rates in increments between about 1 milliliter per hour to about 200 milliliter per minute per user request.

13. The pump system of claim 1, wherein said electronic controller adjusts infusion rates between about 1 milliliter per hour and about 3000 milliliters per minute.

14. A pump system, comprising:

at least one infusion tubing;

a pumping mechanism;

a motor drive assembly in mechanical communication with and rotatably driving said pumping mechanism;

a digital signal processing controller configured to receive at least one user input and to cause power to be supplied to said motor drive assembly in response at least partially to said user input;

wherein said digital signal processing controller comprises a high resolution digital signal processing controller comprising between an approximately 16-bit to an approximately 64-bit registry; and

a heat exchanger removably coupled under pressure to at least one of a heating element or a cooling element,

wherein said heat exchanger comprises a first half constructed from thermally conductive material correspondingly mating with said heating or cooling element;

a second half constructed from thermally conductive material opposite said first half; and

an internal heat exchange zone existing between said first half and said second half, wherein fluid flows therethrough;

wherein said heating or cooling element further comprises at least one thermoelectric heat pump and selectably creates at least one heat point or at least cooling point on the heating and cooling element; and

wherein said heat exchanger is configured to receive and pass therethrough fluid from said infusion tubing as a result of the operation of said pumping mechanism.

15. The pump system of claim 14, further comprising motor power drive circuitry, wherein:

said digital signal processing controller is in electrical communication with said motor power drive circuitry;

said motor power drive circuitry is in electrical communication with said motor drive assembly; and

said digital signal processing controller transmits to said motor power drive circuitry a pulse-width modulation signal relative to said at least one user input that causes said power motor drive circuitry to apply a predetermined level of voltage intermittently to said motor drive assembly.

16. The pump system of claim 14, wherein said pump system delivers fluid at a substantially constant flow rate between about 1 milliliter per hour and at least about 3000 milliliters per minute.

17. The pump system of claim 16, wherein said substantially constant flow rate is variable in response to receiving a second user input.

18. The pump system of claim 14, wherein said pump system is capable of maintaining a substantially constant flow pressure.

19. The pump system of claim 18, wherein said substantially constant flow pressure is between about 0 mmHg and about 750 mmHg.

20. The pump system of claim 18, wherein said substantially constant flow pressure is variable in response to receiving a second user input.