Heat exchanger for high flow rate infusion

• US 20080267599A1
• Filed: 04/24/2007
• Published: 10/30/2008
• Est. Priority Date: 04/24/2007
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: Arizant Healthcare Inc. (3M Company)
• Inventors: McGregor, Andrew J., Hansen, Gary L., Arnold, Randall C., Bieberich, Mark T., Miller, Christopher A., Stapf, Donald E.
• Granted Patent: US 7,720,362 B2
• Time in Patent Office: Days
• US Class Current: 392/470
• CPC Class Codes: A61B 2017/00106 ultrasonic
• CPC Class Codes: A61F 7/0085 Devices for generating hot or cold treatment fluids
• CPC Class Codes: A61M 2205/3653 by Joule effect, i.e. electric resistance
• CPC Class Codes: A61M 2206/11 Laminar flow
• CPC Class Codes: A61M 5/1413 Modular systems comprising interconnecting elements
• 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 5/385 using hydrophobic filters
• CPC Class Codes: A61M 5/445 the media being heated in the reservoir, e.g. warming bloodbags
• CPC Class Codes: B01D 19/0031 by filtration
• CPC Class Codes: F28F 3/12 Elements constructed in the shape of a hollow panel, e.g. with channels F28D1/02, F28D1/03 take precedence

Abstract

A heat exchanger has a laminar fluid flow path receivable between the heating plates of a high flow rate infusion unit to which heat is conducted by contact with the heating plates. A bubble trap and a valve are integrated with the heat exchanger. The bubble trap collects air from the infusate exiting the laminar flow path, and includes an air vent in contact with the infusate that vents the air from the bubble trap. The valve shuts off the flow of infusate if air is detected in the bubble trap.

Claims

1. A heat exchanger for heating fluids in a high flow rate infusion system, comprising:

an inlet and an outlet;

a fluid container with a near and distal ends, two edges, and a laminar flow path in fluid communication with the inlet;

a housing attached to the fluid container at the near end;

a bubble trap in the housing in fluid communication with the laminar flow path; and

a valve in the housing in fluid communication with the bubble trap and the outlet.

2. The heat exchanger of claim 1, the fluid container including a pair of rails, each rail positioned in the fluid container near a respective edge thereof such that the laminar flow path is between the rails, and each rail including a first end at the near end of the fluid container and held in the housing.

3. The heat exchanger of claim 2, wherein:

a first rail including a first passageway in fluid communication with the inlet through the first end and a lateral opening near the distal end providing fluid communication between the first passageway and the laminar flow path; and

,

the second rail including a second passageway in fluid communication with the bubble trap through the first end and a lateral opening near the near end providing fluid communication between the second passageway and the laminar flow path.

4. The heat exchanger of claim 3 wherein the first end of each rail is barbed, further including a pair of recesses in the housing, each first end held in a respective recess.

5. The heat exchanger of claim 1, further including a sensor coupler on an outside face of the housing, adjacent the bubble trap.

6. The heat exchanger of claim 5, the sensor coupler constituted of a molded thermo-plastic elastomer piece with at least one dome formed thereon.

7. The heat exchanger of claim 1, further including means on an outside face of the housing, adjacent the bubble trap, for contacting a plurality of ultrasonic sensors.

8. The heat exchanger of claim 7, the means constituted of a molded thermo-plastic elastomer piece with a plurality of domes formed thereon.

9. The heat exchanger of claim 1, further including an air vent opening through a first face of the housing to the bubble trap.

10. The heat exchanger of claim 9, wherein the air vent is constituted of a vent chamber formed in the first face, a hydrophobic membrane on an inside surface of the first face, over the vent chamber, one or more holes through the vent chamber, and a check valve mounted to an outside surface of the first face, over the holes.

11. The heat exchanger of claim 10, further including means on a second face of the housing, opposite the first face, and adjacent the bubble trap, for conducting ultrasonic measurement signals into and out of the bubble trap.

12. The heat exchanger of claim 11, the means constituted of a molded thermo-plastic elastomer piece with a pair of domes formed thereon.

13. The heat exchanger of claim 1, wherein the valve is constituted of a valve chamber formed in the housing, an opening in a first side of the valve chamber in fluid communication with the bubble trap, and a membrane closing a second side of the valve chamber.

14. The heat exchanger of claim 13, further including an air vent opening through a first face of the housing to the bubble trap.

15. The heat exchanger of claim 14, wherein the air vent is constituted of a vent chamber formed in the first face, a hydrophobic membrane on an inside surface of the first face, over the vent chamber, one or more holes through the vent chamber, and a check valve mounted to an outside surface of the first face, over the holes.

16. The heat exchanger of claim 15, further including means on a second face of the housing, opposite the first face, and adjacent the bubble trap, for conducting ultrasonic measurement signals into and out of the bubble trap.

17. The heat exchanger of claim 16, further including an air vent opening through a first face of the housing to the bubble trap.

18. A combination for heating fluids in a high flow rate infusion system, comprising:

a heat exchanger constituted of;

an inlet and an outlet;

a fluid container with a near and distal ends, two edges, and a laminar flow path in fluid communication with the inlet;

a housing attached to the fluid container at the near end;

a bubble trap in the housing in fluid communication with the laminar flow path; and

a valve in the housing in fluid communication with the bubble trap and the outlet; and

,

a pair of opposed heating plates defining space therebetween for slidably receiving the fluid container, the heating plates including;

means in the heating plates responsive to pressurized infusate in the laminar flow path for causing input and output manifolds to form in the fluid container; and

means in the heating plates for causing the fluid container to be disengaged from the heating plates.

19. The combination of claim 18, further comprising means for heating the heating plates.

20. The combination of claim 18, further comprising means for providing pressurized infusate to the inlet and a patient line connected to the outlet.

21. The combination of claim 20, further comprising means for heating the heating plates.