Devices for warming fluid and methods of use

• US 6,572,641 B2
• Filed: 04/09/2001
• Issued: 06/03/2003
• Est. Priority Date: 04/09/2001
• Status: Expired due to Fees

• Current Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Original Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Inventors: Brugger, James M., Treu, Dennis M., Burbank, Jeffrey H.
• Primary Examiner(s): Joyce, Harold
• Application Number:
  US09/829,670
• Publication Number:
  US 20020147481A1
• Time in Patent Office: 785 Days
• Field of Search: 607/104, 607/105, 607/106, 607/113
• US Class Current: 607/106
• CPC Class Codes: A61F 2007/0054 with a closed fluid circuit, e.g. hot water
• CPC Class Codes: A61F 7/0085 Devices for generating hot or cold treatment fluids
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media

Abstract

An external fluid warming device is described that includes a fluid warming chamber and an air separation chamber. The fluid warming chamber has a fluid inlet that communicates with a fluid pathway. The air separation chamber that communicates with the fluid pathway has a fluid outlet and a gas outlet. A heating source, such as heat plates, are disposed adjacent the fluid pathway for transferring heat to the fluid. In use, the air separation chamber is positioned above the fluid warming chamber and the heating source. The fluid inlet is connected to a source of fluid and the fluid outlet is connected to an output device, such as an ultrafiltration machine. Gas generated during warming of the fluid collects at a top of the air separation chamber and is vented through the gas outlet, whereas fluid passes through a bottom of the air separation chamber and through the fluid outlet.

Claims

1. A device for warming fluid, comprising:

a fluid warming chamber comprising a fluid inlet that communicates with a fluid pathway adapted for heat transfer; and

an air separation chamber that communicates with the fluid pathway, the air separation chamber having a fluid outlet and a gas outlet,

wherein, during use, the device is oriented with the air separation chamber above the fluid warming chamber, gas collects at a top of the air separation chamber and is vented through the gas outlet, and fluid passes through a bottom of the air separation chamber and through the fluid outlet.

2. The device of claim 1, wherein the fluid inlet is at a bottom of the fluid warming chamber.

3. The device of claim 1, further comprising one or more heat plates disposed adjacent the fluid pathway.

4. The device of claim 1, further comprising first and second heat plates disposed adjacent the fluid pathway, and wherein the first heat plate is arranged parallel to the second heat plate with a gap between the first and second heat plates, and wherein the fluid pathway lies within the gap.

5. The device of claim 4, wherein the air separation chamber lies above the gap.

6. The device of claim 1, wherein the fluid pathway is arranged in a zigzag pattern from the fluid inlet to the air separation chamber above the fluid warming chamber.

7. The device of claim 1, wherein the air separation chamber has a partition that separates the fluid outlet from the gas outlet.

8. The device of claim 1, wherein the gas outlet of the air separation chamber includes a transducer protector.

18. The device of claim 1, wherein the fluid warming chamber comprises first and second sheets of PVC material bonded by RF wilding.

19. The device of claim 1, wherein the fluid warming chamber comprises flexible thermoplastic material bonded by heat welding.

9. A device for warming fluid, comprising:

a fluid warming chamber comprising a fluid inlet that communicates with a fluid pathway adapted for heat transfer;

an air separation chamber that communicates with the fluid pathway, the air separation chamber having a fluid outlet and a gas outlet; and

a first heat plate adjacent the fluid warming chamber.

10. The device of claim 9, further comprising a second heat plate adjacent the fluid warming chamber and opposite the first heat plate.

11. The device of claim 9, further comprising a support wall adjacent the fluid warming chamber and opposite the first heat plate.

12. The device of claim 9, wherein the fluid inlet is at a bottom of the fluid warming chamber.

13. The device of claim 9, wherein the fluid warming chamber lies within a gap between the first and second heat plates.

14. The device of claim 13, wherein the air separation chamber lies above the gap.

15. The device of claim 9, wherein the fluid pathway is arranged in a zigzag pattern from the fluid inlet to the air separation chamber above the fluid warming chamber.

16. The device of claim 9, wherein the air separation chamber has a partition that separates the fluid outlet from the gas outlet.

17. The device of claim 9, wherein the gas outlet of the air separation chamber includes a transducer protector.