Pump chamber having at least one spacer for inhibiting the pumping of a gas

• US 6,382,923 B1
• Filed: 07/20/1999
• Issued: 05/07/2002
• Est. Priority Date: 07/20/1999
• Status: Expired due to Term

• Current Assignee: Deka Products Limited Partnership
• Original Assignee: Deka Products Limited Partnership
• Inventors: Gray, Lawrence B.
• Primary Examiner(s): Freay, Charles G.
• Assistant Examiner(s): Rodriguez, William
• Application Number:
  US09/357,644
• Time in Patent Office: 1,022 Days
• Field of Search: 417/53, 417/383, 417/392, 417/395, 417/313, 417/478, 417/477.2, 604/153, 604/151, 604/131, 604/246, 604/30, 604/403, 604/406, 604/407, 92/79, 92/78.R, 92/96
• US Class Current: 417/53
• CPC Class Codes: F04B 2205/503 of gas in a liquid flow, e.g. gas bubbles
• CPC Class Codes: F04B 43/0081 systems, control, safety measures
• CPC Class Codes: F04B 49/065 and making use of computers

Abstract

Pump chambers are disclosed that include at least one spacer element therein to prevent any gas in the pump chamber from being pumped from the pump chamber during pumping. In some embodiments, the pump chambers are included in removable pumping cartridges that are constructed and configured for coupling with reusable pump drives. Some embodiments of pump chambers including spacer elements therein comprise a substantially rigid component forming a wall of the pump chamber with a flexible or movable membrane disposed on the wall to form the chamber. Spacer elements in such pump chambers are, in some embodiments, attached to a wall of the substantially rigid component so as to prevent the movable/flexible membrane from contacting the wall during pumping.

Claims

1. A pump chamber, comprising:

a volumetric container;

a flexible membrane comprising at least a portion of a wall of said container in contact with a fluid contained within the container;

at least one spacer positioned within said container to contact at least a portion of the flexible membrane in contact with the fluid so as to inhibit contact between the flexible membrane and an internal surface of said container.

2. The pump chamber of claim 1, wherein said flexible membrane comprises an elastic membrane.

3. The pump chamber of claim 1, wherein said pump chamber includes a dead space to contain a gas during operation of the pump chamber, said dead space defined as a volume within said pump chamber when said flexible membrane is displaced within said pump chamber to a maximum extent allowed by said at least one spacer.

4. The pump chamber of claim 3, wherein said at least one spacer is positioned within said pump chamber so as to inhibit gas from being pumped through said pump chamber.

5. The pump chamber of claim 4, wherein said pump chamber has an inlet line and an outlet line and wherein said inlet line is located at a top portion of said pump chamber and said outlet line is located at a bottom portion of said pump chamber during operation of said pump chamber.

6. The pump chamber of claim 5, wherein said at least one spacer is configured and positioned in said pump chamber so as to assist air to rise in said pump chamber.

7. A pumping cartridge comprising the pump chamber of claim 1.

8. A pumping device comprising the pumping cartridge of claim 7.

9. The pumping device of claim 8, wherein said pumping cartridge is constructed and configured to be coupled to and removable from a reusable component including a pump drive system for operating said pump chamber.

10. The pumping device of claim 9, wherein said removable pumping cartridge is disposable and designed for a single use.

11. The pumping device of claim 10, wherein said pumping cartridge comprises a substantially rigid first component having a depression therein, and wherein said flexible membrane is disposed over at least a portion of said first component such that upon coupling of said pumping cartridge with said reusable component, said flexible membrane and said first component form an essentially fluid-tight seal enclosing said pump chamber.

12. The pumping device of claim 11, wherein said at least one spacer of said pump chamber comprises an elongate protuberance having an end and a base, said base being attached within said pump chamber to said first component such that said elongate protuberance extends towards said flexible membrane.

13. The pumping device of claim 12, wherein said first component includes a plurality of spacers attached thereto, said spacers being essentially uniformly spaced apart on said first component within said pump chamber.

14. A pump chamber comprising:

a first movable wall of said pump chamber the movable wall comprising a flexible membrane;

a second wall of said pump chamber; and

at least one elongate spacer attached to said second wall and projecting towards said first movable wall and being positioned to contact the flexible membrane during operation of the pump chamber.

15. The pump chamber of claim 14, wherein said flexible membrane comprises an elastic membrane.

16. The pump chamber of claim 14, wherein said pump chamber includes a dead space to contain a gas during operation of the pump chamber, said dead space defined as a volume within said pump chamber when said flexible membrane is displaced within said pump chamber to a maximum extent allowed by said at least one spacer.

17. The pump chamber of claim 16, wherein said at least one spacer is positioned within said pump chamber so as to inhibit gas from being pumped through said pump chamber.

18. The pump chamber of claim 17, wherein said pump chamber has an inlet line and an outlet line and wherein said inlet line is located at a top portion of said pump chamber and said outlet line is located at a bottom portion of said pump chamber during operation of said pump chamber.

19. The pump chamber of claim 18, wherein said at least one spacer is configured and positioned in said pump chamber so as to assist air to rise in said pump chamber.

20. A pumping cartridge comprising the pump chamber of claim 14.

21. A pumping device comprising the pumping cartridge of claim 20.

22. The pumping device of claim 21, wherein said pumping cartridge is constructed and configured to be coupled to and removable from a reusable component including a pump drive system for operating said pump chamber.

23. The pumping device of claim 22, wherein said removable pumping cartridge is disposable and designed for a single use.

24. The pumping device of claim 23, wherein said pumping cartridge comprises a substantially rigid first component having a depression therein, and wherein said flexible membrane is disposed over at least a portion of said first component such that upon coupling of said pumping cartridge with said reusable component, said flexible membrane and said first component form an essentially fluid-tight seal enclosing said pump chamber.

25. The pumping device of claim 24, wherein said at least one spacer of said pump chamber comprises a protuberance having an end and a base, said base being attached within said pump chamber to said first component such that said protuberance extends towards said flexible membrane.

26. The pumping device of claim 25, wherein said first component includes a plurality of spacers attached thereto, said spacers being essentially uniformly spaced apart on said first component within said pump chamber.

27. A method of pumping a fluid, comprising steps of:

providing a pump chamber, the chamber including a flexible membrane; and

preventing any gas contained within said pump chamber from being pumped from said pump chamber by providing at least one spacer element within said pump chamber, which spacer element prevents said flexible membrane from contacting an internal surface of said pump chamber.

28. The method of claim 27, further comprising the step of coupling the pump chamber to a reusable component, the reusable component including a pump drive system constructed and arranged to displace the flexible membrane to operate the pump cartridge.

29. The method of claim 27, wherein during the preventing step, said membrane contacts the at least one spacer element, which spacer element is attached to said internal surface of the pump chamber.