Portable pump for use with IV tubing

• US 20030190246A1
• Filed: 04/05/2002
• Published: 10/09/2003
• Est. Priority Date: 04/05/2002
• Status: Active Grant

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Sigma International
• Inventors: Rechin, Mike, Wollowitz, Michael H., Shvetsov, Yuriy, Hungerford, Roger L., Corwin, Kenneth J.
• Granted Patent: US 7,059,840 B2
• Time in Patent Office: Days
• US Class Current: 417/479
• CPC Class Codes: F04B 43/082 the tubular flexible member being pressed against a wall by a number of elements, each having an alternating movement in a direction perpendicular to the axes of the tubular member and each having its own driving mechanism

Abstract

An apparatus for pumping fluid through tubing comprising a stop platen is disclosed. The stop platen is operatively arranged to depress a wall of the tubing along a section of a longitudinal axis of the tubing. The stop platen is narrower than the tubing along a transverse axis of the tubing. The invention further comprises a cabinet containing the stop platen, a door rotatably fixed to the cabinet, and locking means for preventing rotation of the door. The locking means are operatively arranged to be unlocked by a tubing occluder.

Claims

1. An apparatus for pumping fluid through tubing comprising:

a stop platen, said stop platen operatively arranged to depress a wall of said tubing along a section of a longitudinal axis of said tubing, wherein said stop platen is narrower than said tubing along a transverse axis of said tubing; and

,

actuation means for moving said stop platen to depress said wall of said tubing.

2. The apparatus recited in claim 1 wherein said stop platen is centered with respect to said tubing along said transverse axis of said tubing.

3. The apparatus recited in claim 1 wherein said actuation means comprises a cam fixedly located on a camshaft, said camshaft operatively arranged to be rotated by a motor.

4. The apparatus recited in claim 1 further comprising means to constrain said tubing to remain proximate said stop platen.

5. The apparatus recited in claim 4 wherein said constraining means comprises:

a cabinet containing said stop platen;

a door rotatably fixed to said cabinet; and

,

locking means for preventing rotation of said door.

6. The apparatus recited in claim 5 wherein said locking means comprises a latch, said latch operatively arranged to be unlatched by a tubing occluder.

7. The apparatus recited in claim 6 wherein said latch is operatively arranged to be unlatched by a first end of said tubing occluder, wherein said tubing occluder is operatively arranged to occlude said tubing when said tubing is located proximate a second end of said tubing occluder.

8. A control circuit for an infusion pump, comprising:

a motor operatively arranged to drive said pump;

an N-FET transistor having a gate, drain and source, said N-FET transistor arranged in series with said motor;

a P-FET transistor having a gate, drain and source, said P-FET transistor arranged in series with said motor; and

,

a capacitor operatively arranged to store energy to drive said motor, said capacitor arranged in parallel with said motor, said capacitor having a first lead and a second lead, said first lead connected to a node connecting the drain of said P-FET transistor and a lead from said motor, and said second lead connected to the source of said N-FET transistor.

9. The control circuit recited in claim 8 wherein said N-FET transistor is operatively arranged to be turned off when said P-FET transistor is operatively arranged to be turned on to charge said capacitor, and, subsequently, said N-FET transistor is operatively arranged to be turned on and said P-FET transistor is operatively arranged to be turned off to drive said motor at a relatively low rate of speed.

10. The control circuit recited in claim 9 wherein said relatively low rate of speed is in the range of 1-10 revolutions per hour.

11. The control circuit recited in claim 8 wherein said motor is driven at a rate of speed in the range of 1 revolution per hour to 1 revolution per second.

12. The control circuit recited in claim 8 wherein said P-FET transistor is operatively arranged to be turned on while said N-FET transistor is operatively arranged to drive said motor with pulse width modulation at a relatively high rate of speed.

13. The control circuit recited in claim 12 wherein said relatively high rate of speed is at least 1 revolution per second.

14. The control circuit recited in claim 12 wherein said relatively high rate of speed approximates 1 revolution per second.

15. An apparatus for preventing the free flow of fluid in tubing installed in a pump comprising:

a cabinet containing said pump;

a door rotatably fixed to said cabinet; and

,

locking means for preventing rotation of said door, said means operatively arranged to be unlocked by a tubing occluder.

16. The apparatus recited in claim 15 wherein said locking means comprises a latch, said latch operatively arranged to be unlatched by a first end of said tubing occluder, wherein said tubing occluder is operatively arranged to occlude said tubing when said tubing is located proximate a second end of said tubing occluder.

17. A method for pumping fluid through tubing with a first end and a second end comprising:

occluding said tubing at a first location, said first location between said pump and said first end of said tubing;

delivering said fluid into said tubing from a reservoir in flow communication with said second end of said tubing;

occluding said tubing at a second location, said second location between said reservoir and said pump;

unoccluding said tubing at said first location; and

,

depressing a longitudinal section of said tubing with a stop platen of said pump that is narrower than said tubing along a transverse axis of said tubing.

18. The method recited in claim 17 wherein said stop platen is centered with respect to said tubing in a transverse direction.

19. A method for installing tubing into an infusion comprising:

occluding said tubing with an occluder with a first end and a second end, wherein said tubing is occluded when said tubing is proximate said first end;

inserting said second end of said occluder into said infusion pump to unlock a door of said pump;

installing said occluded tubing in said pump; and

,

locking said door.

20. A method for removing tubing from an infusion pump comprising:

occluding said tubing with an occluder with a first end and a second end, wherein said tubing is occluded when said tubing is proximate said first end;

inserting said second end of said occluder into said infusion pump to release said tubing from constraining means of said pump; and

,

removing said occluded tubing from said pump.

21. The method recited in claim 20 wherein said constraining means comprises a door operatively arranged to prevent the removal of said tubing from said pump when said door is closed.

22. An improvement to an infusion pump comprising:

a stop platen, said stop platen operatively arranged to depress a wall of said tubing along a section of a longitudinal axis of said tubing, wherein said stop platen is narrower than said tubing along a transverse axis of said tubing.

23. A method for unlocking a door of an infusion pump comprising:

inserting a portion of an occluder into said infusion pump to unlock a door of said pump.

24. An improvement to a method for pumping fluid through tubing comprising:

depressing a longitudinal section of said tubing with a stop platen that is narrower than said tubing along a transverse axis of said tubing.