Apparatus for heating, filtering and eliminating gas from biological fluids

• US 5,514,095 A
• Filed: 04/04/1994
• Issued: 05/07/1996
• Est. Priority Date: 04/04/1994
• Status: Expired due to Term

• Current Assignee: Haemonetics Corporation
• Original Assignee: Haemonetics Corporation
• Inventors: Stacey, Gary R., Brightbill, Jerry R.
• Primary Examiner(s): Rosenbaum, C. Fred
• Assistant Examiner(s): MENDEZ, MANUEL A
• Application Number:
  US08/222,649
• Time in Patent Office: 764 Days
• Field of Search: 604/113, 604/114, 604/122-126, 128/DIG. 3, 607/96, 607/104-106, 165/67, 165/156, 165/163, 422/44-48
• US Class Current: 604/113
• CPC Class Codes: A61M 2205/366 by liquid heat exchangers
• CPC Class Codes: A61M 5/44 having means for cooling or heating the devices or media

Abstract

The present invention provides an apparatus for heating, filtering and eliminating gas from biological fluids. The apparatus includes a heat exchanger for heating biological fluids coaxially positioned within a filter unit. The filter unit receives heated fluid from the heat exchanger within an inner chamber and vents gas to the atmosphere contained within the heated fluid through a vent on the inner chamber. The fluid is radially filtered between the inner chamber and an outer chamber by a filter element coaxially separating the inner and outer chambers.

Claims

1. Apparatus comprising:

a heat exchanger having a longitudinal axis for heating biological fluids, the heat exchanger having an inlet port and an outlet passage; and

a filter unit, the filter unit surrounding a portion of the heat exchanger along the longitudinal axis, the filter unit comprising;

an inner chamber, the inner chamber being in fluid communication with the outlet passage of the heat exchanger for receiving heated fluid from the heat exchanger, said heated fluid contains gas;

an outer chamber surrounding the inner chamber, the inner and outer chambers having a top and a bottom;

a top cap enclosing the top of the inner and outer chambers;

a bottom cap enclosing the bottom of the inner and outer chambers;

a vent on the top cap venting the inner chamber for venting the gas from heated fluid within the inner chamber; and

a filter element coupling the inner and outer chambers together in fluid communication, the filter element for filtering fluid pumped in a radial direction from the inner chamber to the outer chamber.

2. The apparatus of claim 1 in which the filter unit further comprises an outlet port in fluid communication with the outer chamber for discharging the fluid from the filter unit.

3. The apparatus of claim 1 in which the heat exchanger comprises:

an inner conduit containing a heating medium; and

an outer conduit coaxial with the inner conduit forming a heat exchanging passageway between the inner conduit and the outer conduit such that fluid flowing through the heat exchanging passageway is heated.

4. The apparatus of claim 3 in which the heating medium is heated water flowing through the inner conduit.

5. The apparatus of claim 3 in which the heat exchanging passageway is spiraled.

6. The apparatus of claim 1 in which the filter element is coaxial to the heat exchanger, the filter element coaxially coupling the inner chamber in fluid communication with the outer chamber for radially filtering fluid.

7. The apparatus of claim 6 in which the fluid flows upwardly through the heat exchanging passageway into the inner chamber towards the vent, radially and outwardly from the inner chamber into the outer chamber, and downwardly through the outer chamber.

8. Apparatus comprising:

a heat exchanger having a longitudinal axis for heating biological fluids, the heat exchanger having an inlet port and an outlet passage; and

a filter unit coaxially surrounding a portion of the heat exchanger along the longitudinal axis, the filter unit comprising;

an inner chamber, the inner chamber being in fluid communication with the outlet passage of the heat exchanger for receiving heated fluid from the heat exchanger, said heated fluid containing gas;

an outer chamber coaxially surrounding the inner chamber, the inner and outer chambers having a top and a bottom;

a top cap enclosing the top of the inner and outer chambers;

a bottom cap enclosing the bottom of the inner and outer chambers;

a vent on the top cap venting the inner chamber to the atmosphere for venting gas from heated fluid within the inner chamber to the atmosphere; and

a filter element coaxially coupling the inner and outer chambers together in fluid communication, the filter element radially filtering fluid pumped in a radial direction from the inner chamber into the outer chamber, the fluid in the apparatus flowing upwardly through the heat exchanging passageway into the inner chamber towards the vent, radially and outwardly from the inner chamber into the outer chamber, and downwardly through the outer chamber.

9. The apparatus of claim 8 in which the filter assembly further comprises an outlet port in fluid communication with the outer chamber for discharging the fluid from the filter unit.

10. The apparatus of claim 8 in which the heat exchanger comprises:

an inner conduit containing a heating medium; and

an outer conduit coaxial with the inner conduit forming a heat exchanging passageway between the inner conduit and the outer conduit such that fluid flowing through the heat exchanging passageway is heated.

11. The apparatus of claim 10 in which the heating medium is heated water flowing through the inner conduit.

12. The apparatus of claim 10 in which the heat exchanging passageway is spiraled.

13. A method of processing biological fluids comprising the steps of:

heating a biological fluid with a heat exchanger having a longitudinal axis;

discharging the heated fluid from the heat exchanger into an inner chamber of a filter unit, the inner chamber of the filter unit surrounding a portion of the heat exchanger along the longitudinal axis;

eliminating gas from the heated fluid within the inner chamber of the filter unit by venting the gas through a vent on the inner chamber; and

filtering the fluid by forcing the fluid from the inner chamber into an outer chamber in a radial direction through a filter element, the outer chamber surrounding the inner chamber and coupled in fluid communication with the inner chamber by the filter element.

14. The method of claim 13 further comprising the step of infusing the fluid into a patient.

15. The method of claim 13 further comprising the step of pumping biological fluid to be processed into the heat exchanger with a pump.

16. The method of claim 13 in which the filter element coaxially couples the inner chamber in fluid communication with the outer chamber for radially filtering the fluid.

17. The method of claim 16 in which the fluid flows upwardly through the heat exchanger into the inner chamber towards the vent, radially from the inner chamber into the outer chamber, and downwardly through the outer chamber.

18. A method of processing biological fluids comprising the steps of:

pumping biological fluid to be processed with a pump into a heat exchanger having a longitudinal axis;

heating the biological fluid with the heat exchanger;

discharging the heated fluid from the heat exchanger into an inner chamber of a filter unit, the inner chamber of the filter unit coaxially surrounding a portion of the heat exchanger along the longitudinal axis;

eliminating gas from the heated fluid within the inner chamber of the filter unit by venting the gas to the atmosphere through a vent on the inner chamber;

filtering the fluid by forcing the fluid from the inner chamber into an outer chamber in a radial direction through a filter element, the outer chamber coaxially surrounding the inner chamber and coupled in fluid communication with the inner chamber by the filter element; and

infusing the fluid into a patient.

19. The method of claim 18 in which the fluid flows upwardly through the heat exchanger into the inner chamber towards the vent, radially from the inner chamber into the outer chamber, and downwardly through the outer chamber.