Devices for potting a filter for blood processing

• US 6,702,561 B2
• Filed: 07/12/2001
• Issued: 03/09/2004
• Est. Priority Date: 07/12/2001
• Status: Expired due to Fees

• Current Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Original Assignee: Nxstage Medical Incorporated (Fresenius Medical Care AG)
• Inventors: Stillig, Martin, Brugger, James M., Burbank, Jeffrey H.
• Primary Examiner(s): DAVIS, ROBERT B
• Application Number:
  US09/904,712
• Publication Number:
  US 20030010702A1
• Time in Patent Office: 971 Days
• Field of Search: 210/321.6, 210/321.8, 210/321.89, 264/310, 264/311, 264/271.1, 264/279, 264/261, 264/263, 264/DIG.48, 425/110, 425/120, 425/127, 425/425
• US Class Current: 425/120
• CPC Class Codes: A61M 1/16 with membranes
• CPC Class Codes: B01D 63/022 Encapsulating hollow fibres
• CPC Class Codes: B01D 63/0224 Opening the fibre ends after encapsulation
• CPC Class Codes: B29C 70/766 on the end part of a tubular article
• CPC Class Codes: B29L 2031/14 Filters optical filters B29L2011/0066, sieves or screens B29L2031/737
• CPC Class Codes: B29L 2031/755 Membranes, diaphragms
• CPC Class Codes: Y10S 264/48 Processes of making filters

Abstract

A device for potting a filter is described. The device comprises a housing having a first hole in the first region communicating between the surface and the lumen, and a second hole in the second region communicating between the surface and the lumen. A ridge extends around the first hole and the second hole to define a trough for receipt of a flowable potting material. During the manufacture of the filter assembly, the housing is rotated about an axis that bisects the housing and is perpendicular to an axis of the lumen, a flowable material is placed on the surface of the housing, a portion of the flowable material flows toward the first hole, is retained by the ridge, and passes through the first hole, and a portion of the flowable material flows toward the second hole, is retained by the ridge, and passes through the second hole.

Claims

1. A device for potting a filter, comprising:

a housing having a first end, a second end, an outer surface, an inner surface, a hollow lumen, a first region near the first end, a second region near the second end, a first hole in the first region communicating between the outer surface of the housing and the hollow lumen, and a second hole in the second region communicating between the outer surface of the housing and the hollow lumen; and

a ridge on the outer surface of the housing that extends around the first hole to a point closer the first end of the housing and extends around the second hole to a point closer the second end of the housing, the ridge defining a trough having a continuous access defined by said ridge, said ridge having an edge adapted to seal against a separate cap such that during filter manufacturing, the housing and cap are rotated about an axis that bisects the housing and is perpendicular to an axis of the lumen, a flowable material is placed on the outer surface of the housing approximately halfway between the first hole and the second hole, a portion of the flowable material flows toward the first hole, is retained by the ridge and said separate cap, and passes through the first hole, and a portion of the flowable material flows toward the second hole, is retained by the ridge and said separate cap, and passes through the second hole.

2. The device of claim 1, wherein the housing is a cylindrical-shaped housing.

3. The device of claim 1, further comprising a first cap on the first end of the cylindrical housing and a second cap on the second end of the cylindrical housing.

4. The device of claim 1, further comprising filter membrane fibers within the hollow lumen of the housing.

5. The device of claim 1, further comprising an ultrafiltrate port in the housing communicating between the outer surface of the housing and the inner lumen.

6. The device of claim 3, wherein the first cap includes a blood inlet port and the second cap includes a blood outlet port.

7. The device of claim 6, wherein the first cap further comprises an hemodilution port and the second cap further comprises a hemodilution port.

9. The device of claim 1, further comprising a first cutting notch in the first region extending around the circumference of the housing, and a second cutting notch in the second region extending around the circumference of the housing.

10. The device of claim 1, wherein the first and second holes are rectangular shaped.

8. A device for potting a filter, comprising:

a housing having a first end, a second end, an outer surface, an inner surface, a hollow lumen, a first region near the first end, a second region near the second end, a first hole in the first region communicating between the outer surface of the housing and the hollow lumen, and a second hole in the second region communicating between the outer surface of the housing and the hollow lumen; and

a ridge on the outer surface of the housing that extends around the first hole to a point closer the first end of the housing and extends around the second hole to a point closer the second end of the housing, wherein, during filter manufacturing, the housing is rotated about an axis that bisects the housing and is perpendicular to an axis of the lumen, a flowable material is placed on the outer surface of the housing approximately halfway between the first hole and the second hole, a portion of the flowable material flows toward the first hole, is retained by the ridge, and passes through the first hole, and a portion of the flowable material flows toward the second hole, is retained by the ridge, and passes through the second hole wherein the ridge is a generally diamond-shaped parallelogram.

11. A device for potting a filter, comprising:

a filter housing configured to hold filter membrane fibers extending along a length thereof between first and second ends of said filter housing;

said filter housing having at least one first opening at said first end and at least one second opening at said second end, said at least one first opening and said at least one second opening communicating with an interior of said filter housing with a flow guide for guiding the flow of potting material;

said flow guide having a ridge connected alone a length of said filter housing such that said flow guide has the shape of an open trough;

said flow guide being configured such that potting material flows toward said holes when said flow guide is temporarily covered to enclose it by a cap and when said filter housing and said cap are spun about an axis perpendicular to a longitudinal axis of said filter housing, whereby when filter fibers are held in said filter housing and potting material so caused to flow, the amount of potting material settling toward said first and second ends is maximized.

12. The device of claim 11, wherein said guide is channel-shaped.

13. The device of claim 11, wherein said guide is configured such that equal amounts of potting material are caused to flow to each of said openings.

14. The device of claim 11, wherein said channel and said openings are configured such that said potting material may include polyurethane.

15. The device of claim 11, wherein said flow guide is an integral part of said filter housing.

16. The device of claim 15, wherein said guide is channel-shaped.

17. A device for potting a filter, comprising:

means for supporting filter fibers;

means for containing potting material at ends of said means for supporting;

means for guiding permanently attached to said means for supporting a fluid effective to seal said filter fibers when said fluid is hardened;

means for temporarily enclosing an open length of said means for guiding,

said means for guiding including means for conveying said fluid toward said means for containing such that said fluid is distributed evenly between said ends when said means for supporting, said means for guiding, and said means for temporarily enclosing are spun about an axis of said means for supporting.

18. A device as in claim 17, wherein said means for supporting is configured to form a flow plenum of a filter.

19. A device as in claim 17, wherein said means for supporting is a filter housing.

20. A device as in claim 17, wherein said means for containing include respective interiors and said means for conveying include openings in communication with said interiors.

21. A device for potting a filter, comprising:

a generally cylindrical housing with a hollow lumen and a trough defined by a ridge running longitudinally along an axis of said housing;

said ridge extending from said generally cylindrical housing such that said trough is closed on all sides except for a trough opening facing away from said housing except for at least one opening near each end of said housing communicating an interior of said trough with an interior of said housing;

said ridge having an edge adapted to seal against a separate cap thereby defining an enclosure such that during filter manufacturing, when the housing and said separate cap are rotated about a spinning axis, which is perpendicular to said housing axis, with a flowable material placed in said trough, said separate cap keeps said flowing material from flowing over said ridge, thereby causing said flowing material to flow into said openings, retained by the ridge and separate cap.

22. A device as in claim 21, wherein said ridge has an edge surrounding said trough opening, said edge lies in a plane, said trough is wider toward a center thereof than at its ends, said ridge following said cylindrical housing such that said trough is also deeper toward said center.

23. A device as in claim 21, wherein said ridge defines a parallelogram shape.

24. A device as in claim 21, wherein said trough has a bottom surface opposite said trough opening whose surface follows a shape of said housing.

25. A device as in claim 23,wherein said trough has a bottom surface opposite said trough opening whose surface is cylindrical.

26. A device for potting a filter, comprising:

a housing configured to hold a filter bundle, said housing having an elongated shape with a longitudinal axis;

said housing having an elongated open trough on a side thereof, said trough having a longitudinal axis generally parallel to said housing longitudinal axis;

said housing having at least one port communicating an interior of said housing with an exterior thereof;

said open trough being defined by a ridge having an edge;

said edge being shaped to form a seal with a trough cap such that said open trough may be enclosed.

27. A device as in claim 26, wherein said trough has openings communicating said interior of said trough with an interior of said housing.

28. A device as in claim 26, wherein said ridge defines a parallelogram.

29. A device as in claim 26, wherein said ridge has an edge surrounding said trough opening, said edge lies in a plane, said trough is wider toward a center thereof than at its ends, said housing is generally cylindrical, and said ridge follows a shape said cylindrical housing such that said trough is also deeper toward said center.

30. A device as in claim 28, wherein said ridge defines a parallelogram.

31. A device as in claim 26, wherein said trough has a bottom surface opposite said trough opening whose surface follows a shape of said housing.

32. A device as in claim 26, further comprising end caps fittable on ends of said housing.

33. A device as in claim 26, further comprising filter membrane fibers within the hollow lumen of the housing.