Device and method for treating a medical fluid and medical cassette

Patent metadata

Field	Value
Publication number	US-9669145-B2
Application number	US-201313925571-A
Country	US
Kind code	B2
Filing date	Jun 24, 2013
Priority date	Sep 10, 2007
Publication date	Jun 6, 2017
Grant date	Jun 6, 2017

Abstract

An apparatus for treating a medical fluid is provided which includes a treatment machine having a coupling surface, with a cassette made of a hard part having liquid-conducting passages which are covered by a flexible film being able to be coupled to the coupling surface of the treatment machine. A corresponding medical cassette is also provided. An air-free coupling of the flexible film of the cassette to the treatment machine is ensured in that air can be sucked out areally along a plane between the flexible film and the coupling surface during the coupling process and/or with a coupled cassette. A method for coupling the cassette and a method for checking the leaktightness of the cassette via the vacuum control of the air suction is also provided.

First claim

What is claimed is:

1. An apparatus for treating a medical liquid comprising a treatment machine having a coupling surface, with a cassette made of a hard, part having liquid-conducting passages which are covered by a flexible film being able to be coupled to the coupling surface of the treatment machine, a surface of the flexible film facing the coupling surface of the treatment machine having a structuring, said structuring being formed by grooves that are recessed in the surface of the flexible film, the grooves forming passages through which air can be sucked out along the structuring of the film during the coupling process and/or with a coupled cassette.

2. An apparatus for treating a medical liquid comprising a treatment machine having a coupling surface and a flexible mat arranged on the coupling surface, with a cassette made of a hard part having liquid-conducting passages which are covered by a flexible film being able to be coupled to the coupling surface of the treatment machine via the flexible mat, a surface of the flexible mat facing the flexible film having a structuring, said structuring being formed by grooves that are recessed in the surface of the flexible mat, the grooves forming passages through which air can be sucked out along the structuring of the flexible mat during the coupling process and/or with a coupled cassette.

3. The apparatus in accordance with claim 1 , wherein the structuring has a net structure and/or a meander-like and/or linear structure.

4. The apparatus in accordance with claim 1 , wherein the structuring is made anisotropoic and/or inhomogeneous.

5. The apparatus in accordance with claim 1 , wherein the structuring extends along the liquid-conducting passages.

6. The apparatus in accordance with claim 5 , wherein the structuring converges in one or more regions outside the liquid-conducting passages which form suction points.

7. The apparatus in accordance with claim 1 , wherein the structuring extends substantially perpendicular to a passage web edge on a transition from a-region with liquid-conducting passages to a region outside the liquid-conducting passages.

8. The apparatus in accordance with claim 5 , wherein the structuring has a spacing from the passage web edges in the regions in which it does not traverse the passage web edges.

9. The apparatus in accordance with claim 5 , wherein the structuring is made such, that there is no direct connection between regions of the film with different liquid-conducting passages.

10. The apparatus in accordance with claim 1 , wherein the cassette is pressed with the coupling surface in the coupled state, with the film being pressed in a fluid-tight manner with the liquid-conducting passages of the hard part of the cassette, but with the structuring along its plane allowing air transport.

11. The apparatus in accordance with claim 1 , wherein the apparatus includes at least one suction device.

12. The apparatus in accordance with claim 11 , wherein the structuring is in communication with a vacuum device at one or more points outside the region of the liquid-conducting passages.

13. The apparatus in accordance with claim 1 , wherein suction takes place via at least one valve arranged in the coupling surface of the treatment machine.

14. The apparatus in accordance with claim 1 , wherein suction takes place via one ore more suction openings arranged in the hard part of the cassette.

15. The apparatus in accordance with claim 1 , wherein the apparatus includes an optical sensor for the recognition of leaks.

16. The apparatus in accordance with claim 1 , wherein the apparatus includes a vacuum device that carries out an automatic suction of the air.

17. The apparatus in accordance with claim 16 , wherein the vacuum device carries out an automatic check of the leaktightness of the cassette.

18. A medical cassette made of a hard part having liquid-conducting passages which are covered by a flexible film, with the cassette be able to be coupled to a coupling surface of a treatment machine, a surface of the flexible film facing the coupling surface of the treatment machine having a structuring, said structuring being formed by grooves that are recessed in the surface of the flexible film, the grooves forming passages through which air can be sucked out along the plane of the film in the coupled state of the cassette.

19. The medical cassette in accordance with claim 18 , wherein the hard part of the cassette has a peripheral marginal region into which the structuring does not extend so that this marginal region forms a sealing web on pressing.

20. The medical cassette in accordance with claim 19 , wherein the flexible film is welded to the hard part of the cassette in the peripheral marginal region.

21. The medical cassette in accordance with claim 18 , wherein the structuring has a net structure and/or a meander-like structure and/or a linear structure.

22. The medical cassette in accordance with claim 18 , wherein the structuring is made anisotropic and/or inhomogeneous.

23. The medical cassette in accordance with claim 18 , wherein the structuring extends along the liquid-conducting passages.

24. The medical cassette in accordance with claim 18 , wherein the structuring converges in one or more regions outside the liquid-conducting passages which form suction points.

25. The medical cassette in accordance with claim 18 , wherein the structuring extends substantially perpendicular to a passage web edge on a transition from a region with liquid-conducting passages to a region outside the liquid-conducting passages.

26. The medical cassette in accordance with claim 23 , wherein the structuring has a spacing from the passage web edges in the regions in which it does not traverse the passage web edges.

27. The medical cassette in accordance with claim 23 , wherein the structuring is made such that there is no direct connection between regions of the film with different liquid-conducting passages.

28. The medical cassette in accordance with claim 18 , wherein the hard part has containment webs which connect passage rim sealing webs and form areas sealing pressed closed.

29. The medical cassette in accordance with claim 18 , the cassette includes at least one suction opening arranged in the hard part of the cassette.

30. The medical cassette in accordance with claim 29 , wherein the suction opening is arranged outside the region of the liquid-conducting passages.

31. The medical cassette in accordance with claim 29 , wherein the flexible film is welded to the hard part of the cassette around the suction opening by an annular weld seam.

32. The medical cassette in accordance with claim 31 , wherein the annular weld seam has a structuring around the suction opening.

33. The medical cassette in accordance with claim 31 , wherein a region including the weld seam is lowered with respect to a pressing plane of the cassette.

34. The medical cassette in accordance with claim 29 , wherein a hydrophobic filter is arranged at the suction opening.

35. A method for coupling a medical cassette made of a hard part having liquid-conducting passages which are covered by a flexible film to a coupling surface of a treatment machine for treating a medical fluid comprising the steps

Assignees

• Fresenius Medical Care Deutschland Gmbh

Inventors

• Günther Götz
• Häcker Jürgen
• Köhler Markus
• Lauer Martin
• MüLLER RALF
• Schneider Hans-Peter
• Weber Tobias
• Weis Manfred

Classifications

• A61M1/16 Primary

  with membranes · CPC title

• Y10T29/49826

  Assembling or joining · CPC title

• A61J1/14

  Details; Accessories therefor (A61J7/00 takes precedence; openers B65D, B67B7/00) · CPC title

• A61M2205/122

  using evacuated interfaces to enhance contact · CPC title

• A61M1/28

  Peritoneal dialysis {; Other peritoneal treatment, e.g. oxygenation} · CPC title