Device and system for filtering blood

• US 20050126962A1
• Filed: 05/14/2003
• Published: 06/16/2005
• Est. Priority Date: 05/17/2002
• Status: Active Grant

• Current Assignee: Gambro Lundia AB (Baxter International Inc.)
• Original Assignee: Gambro Lundia AB (Baxter International Inc.)
• Inventors: Nilsson, Anders
• Granted Patent: US 8,153,008 B2
• Time in Patent Office: Days
• US Class Current: 210/97
• CPC Class Codes: A61M 1/34 Filtering material out of the blood by passing it through a membrane, i.e. hemofiltration or diafiltration
• CPC Class Codes: A61M 1/341 by measuring the filtrate rate or volume
• CPC Class Codes: A61M 2205/15 Detection of leaks
• CPC Class Codes: A61M 2209/088 on the body

Abstract

Device (5) for filtering blood including a filter unit (7) having a blood filter, an inlet (8) for blood to be filtered and being connectable to an artery of a patient and a blood outlet (9) for filtered blood and being connectable to a vein of the patient, and having a filtrate container (6,14), that encloses the filter unit (7), for receiving filtrate (12) passing through the blood filter during a filtering process and that the filtrate container (6,14) is a closed container, which in a filled state is arranged to establish a counter-pressure over the blood filter, whereby the filtering process is interrupted. The invention also concerns a system including the above device.

Claims

1. Device for filtering blood including a filter unit having a blood filter, an inlet for blood to be filtered and being connectable to an artery of a patient and a blood outlet for filtered blood and being connectable to a vein of the patient, and having a filtrate container for receiving filtrate passing through the blood filter during a filtering process and that the filtrate container is a closed container which in a filled state is arranged to establish a counter-pressure over the blood filter, whereby the filtering process is interrupted characterized in

that the filtrate container encloses the filter unit.

2. Device according to claim 1, characterized in that the filtrate container includes a substantially rigid vessel for collecting filtrate and an air vent for allowing the escape of air from the vessel during a filtering process.

3. Device according to claim 1, characterized in that the air vent comprises an air permeable, liquid non-permeable membrane.

4. Device according to claim 1, characterized in that the filtrate container includes a flexible, expandable container which is collapsed in an empty state.

5. Device according to claim 4, characterized in that the flexible, expandable container is enclosed in an outer, substantially rigid container.

6. Device according to claim 1, characterized in that the filtrate container with the filter unit comprises a one-way, disposable unit.

7. Device according to claim 1, characterized in that the blood filter comprises a substantially tubular filter body.

8. Device according to claim 1, characterized in that the blood filter is an ultra filtration filter.

9. Device according to claim 1, characterized in that the filtrate volume of the filtrate container is chosen between about 0.2-1 litre.

10. System for ultra filtration of blood including a device according to claim 1.

11. System according to claim 10 including an implanted bloodstream access device.

12. A method for filtering blood of a patient, said method comprising the steps of:

providing a blood filter having an inlet and an outlet, and a filtrate container enclosing said blood filter for receiving filtrate passing through the blood filter during a filtering process, the blood filter and the filtrate container being adapted to be worn by the patient;

obtaining blood from the inlet which is adapted to be connected to an artery side of the patient;

filtering of blood with the blood filter until a predetermined amount of filtrate has been obtained; and

returning the filtered blood to the outlet adapted to be connected to a vein side of the patient;

wherein the above steps are performed in order to remove excess fluid from the blood stream of the patient.

13. The method according to claim 12, wherein the filtrate container includes a substantially rigid vessel for collecting filtrate and an air vent for allowing the escape of air from the vessel during the filtering process.

14. The method according to claim 13, wherein the air vent comprises an air permeable, liquid non-permeable membrane.

15. The method according to claim 12, wherein the filtrate container includes a flexible and expandable container that is collapsed in an empty state.

16. The method according to claim 15, wherein the flexible and expandable container is enclosed in a substantially rigid outer container.

17. The method according to claim 12, wherein the blood filter comprises a substantially tubular filter body.

18. The method according to claim 12, wherein the blood filter is an ultra filtration filter.

19. The method according to claim 12, wherein the filtrate container has a filtration volume of about 0.2-1 litre.

20. The method according to claim 12, wherein an implanted bloodstream access device is provided for connecting with said inlet and outlet of the blood filter.

21. The method according to claim 18, wherein the above steps are performed to partially replace the hemodialysis treatment.