Fluid delivery systems and methods having floating baffle aided air removal

• US 8,025,716 B2
• Filed: 02/18/2011
• Issued: 09/27/2011
• Est. Priority Date: 10/01/2007
• Status: Expired due to Fees

• Current Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Original Assignee: Baxter Healthcare SA (Baxter International Inc.), Baxter International Inc.
• Inventors: Acikgoz, Serhan, Yardimci, Atif M., Prisco, Michael R., Laird, James C., Rohde, Justin B., Maliekkal, Shincy J.
• Primary Examiner(s): Smith; Duane
• Assistant Examiner(s): THEISEN, DOUGLAS J
• Application Number:
  US13/030,624
• Publication Number:
  US 20110137236A1
• Time in Patent Office: 221 Days
• Field of Search: 952/62, 952/60, 962/04
• US Class Current: 95/260
• CPC Class Codes: A61M 1/152 Details related to the interface between cassette and machine
• CPC Class Codes: A61M 1/155 with treatment-fluid pumping means or components thereof
• CPC Class Codes: A61M 1/1565 Details of valves
• CPC Class Codes: A61M 1/1658 Degasification
• CPC Class Codes: A61M 1/288 Priming priming in extracorporeal blood circuits A61M1/3643
• CPC Class Codes: A61M 1/3627 Degassing devices; Buffer reservoirs; Drip chambers; Blood filters
• CPC Class Codes: A61M 2205/12 with interchangeable cassettes forming partially or totally the fluid circuit
• CPC Class Codes: A61M 2205/128 with incorporated valves
• CPC Class Codes: B01D 19/0042 modifying the liquid flow B01D19/0021 takes precedence

Abstract

A medical fluid delivery system includes a fluid disposable configured to hold and transport a medical fluid and an air separation chamber in fluid communication with the fluid disposable. The air separation chamber includes at least one fluid baffle floating within the air separation chamber and configured to separate air from medical fluid traveling through the chamber.

Claims

1. A medical fluid delivery system comprising:

a fluid disposable configured to hold and transport a medical fluid; and

an air separation chamber in fluid communication with the fluid disposable, the air separation chamber including at least one fluid baffle floating within the air separation chamber and configured to separate air from medical fluid traveling through the chamber, wherein the at least one floating fluid baffle includes;

(i) plural particles, (ii) a coiled strip, or (iii) a twisted strip.

2. The medical fluid system of claim 1, wherein the at least one fluid baffle is textured to produce additional surface contact area for removing air from the medical fluid.

3. The medical fluid system of claim 1, which is a hemodialysis system, the fluid disposable configured to transport blood.

4. The medical fluid system of claim 1, which includes an instrument configured to pump the medical fluid through the fluid disposable.

5. The medical fluid system claim 1, wherein the plural particles are at least substantially spherically shaped.

6. The medical fluid system of claim 1, wherein the air separation chamber includes a chamber bottom, a chamber top, a fluid inlet, a fluid outlet and an air vent, at least one of the fluid inlet and the fluid outlet located nearer the chamber bottom than the chamber top, and the vent located nearer the chamber top than the chamber bottom.

7. The medical fluid system of claim 1, wherein the fluid disposable includes a rigid portion, the at least one floating fluid baffle moveable independent from the rigid portion of the fluid disposable.

8. The medical fluid system of claim 1, wherein the air separation chamber is part of the fluid disposable.

9. The medical fluid system of claim 1, wherein the fluid disposable includes a flexible pumping sheet.

10. A medical fluid delivery system comprising:

an instrument configured to pump medical fluid through an air separation chamber, the air separation chamber including at least one fluid baffle floating within the air separation chamber and configured to separate air from the medical fluid pumped through the chamber, wherein the floating fluid baffle includes;

(i) plural particles, (ii) a coiled strip, or (iii) a twisted strip.

11. The medical fluid system of claim 10, including a fluid disposable configured to hold and transport the medical fluid, the instrument configured to pump the medical fluid through the fluid disposable.

12. The medical fluid delivery system of claim 11, wherein the air separation chamber is part of the fluid disposable.

13. The medical fluid delivery system of claim 11, which is a hemodialysis system, the fluid disposable configured to transport blood.

14. The medical fluid delivery system of claim 10, wherein the floating fluid baffle is textured to produce additional surface contact area for removing air from the medical fluid.

15. The medical fluid delivery system of claim 10, wherein the plural particles are at least substantially spherically shaped.

16. The medical fluid delivery system of claim 10, wherein the air separation chamber includes a fluid inlet, a fluid outlet and an air vent, the plural particles sized to have a diameter larger than a diameter of the inlet, the outlet or the air vent.

17. A fluid delivery method comprising:

flowing a medical fluid;

removing air from the medical fluid using buoyancy forces; and

floating at least one coiled or twisted strip in the fluid to remove air from the medical fluid by disrupting the flow of medical fluid.

18. The fluid delivery method of claim 17, wherein the medical fluid is a dialysis fluid and which includes pumping the dialysis fluid past the at least one floating baffle.

19. The fluid delivery method of claim 18, wherein the medical fluid is blood and which includes pumping the blood past the at least one coiled or twisted strip.

20. The fluid delivery method of claim 18, which includes floating a plurality of at least substantially spherically shaped particles in the medical fluid.

21. A medical fluid delivery system comprising:

a fluid disposable configured to hold and transport a medical fluid; and

an air separation chamber in fluid communication with the fluid disposable, the air separation chamber including at least one fluid baffle floating within the air separation chamber and configured to separate air from medical fluid traveling through the chamber, wherein the at least one fluid baffle is textured to produce additional surface contact area for removing air from the medical fluid.

22. A medical fluid delivery system comprising:

a fluid disposable including a flexible pumping sheet, the fluid disposable configured to hold and transport a medical fluid; and

an air separation chamber in fluid communication with the fluid disposable, the air separation chamber including at least one fluid baffle floating within the air separation chamber and configured to separate air from medical fluid traveling through the chamber.

23. A fluid delivery method comprising:

flowing a medical fluid;

removing air from the medical fluid using buoyancy forces; and

floating a plurality of at least substantially spherically shaped particles in the fluid to remove air from the medical fluid by disrupting the flow of medical fluid.