Inverted embolic protection filter

• US 20030208224A1
• Filed: 05/06/2002
• Published: 11/06/2003
• Est. Priority Date: 05/06/2002
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Broome, Thomas E.
• Granted Patent: US 8,070,769 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0108 Both ends closed, i.e. legs gathered at both ends
• CPC Class Codes: A61F 2002/015 Stop means therefor
• CPC Class Codes: A61F 2002/018 made from tubes or sheets of material, e.g. by etching or laser-cutting
• CPC Class Codes: A61F 2230/0006 circular
• CPC Class Codes: A61F 2230/0067 conical

Abstract

An embolic protection filter having an inverted membrane with improved blood perfusion characteristics is disclosed. An embolic protection filter in accordance with the present invention comprises a filter frame disposable about a guidewire, a support hoop coupled to a plurality of expandable struts, and an inverted membrane for filtering embolic debris. The inverted membrane has a tapered proximal section and an enlarged diameter distal section. Features of the present invention permit the perfusion of blood through the filter irrespective of embolic debris entrained therein.

Claims

1. An embolic protection filter comprising:

a filter frame disposable about a guidewire; and

an inverted membrane attached to a portion of said filter frame, said inverted membrane having a tapered proximal section and an enlarged diameter distal section.

2. The embolic protection filter of claim 1, wherein said filter frame comprises a first tubular member disposable about the guidewire, and a second tubular member disposable about the guidewire distal the first tubular member.

3. The embolic protection filter of claim 1, wherein a portion of said filter frame is secured to the guidewire.

4. The embolic protection filter of claim 1, wherein said guidewire further includes a distal stop, and wherein the filter frame is slidably and rotationally disposed about the guidewire.

5. The embolic protection filter of claim 1, wherein said inverted membrane is a microporous membrane.

6. The embolic protection filter of claim 5, wherein said microporous membrane is comprised of a polymeric material.

7. The embolic protection filter of claim 6, wherein said polymeric material is selected from the group consisting of polypropylene, polyvinylchloride, polyamide, polyurethane, polyester, polyethylene tetraphlalate, polyether-ether ketone, polyether block amide and polytetrafluoroethylene.

8. The embolic protection filter of claim 1, wherein said inverted membrane comprises a mesh screen.

9. The embolic protection filter of claim 8, wherein said mesh screen is formed of a metal.

10. The embolic protection filter of claim 9, wherein said metal is selected from the group consisting of stainless steel, nickel-titanium alloy and platinum.

11. The embolic protection filter of claim 1, wherein said inverted membrane is substantially conical in shape.

12. The embolic protection filter of claim 1, further comprising a support hoop coupled to a plurality of expandable struts biased to expand in an outward direction with a body lumen.

13. The embolic protection filter of claim 12, wherein said plurality of expandable struts are biased to self-expand within the body lumen.

14. The embolic protection filter of claim 12, wherein said plurality of expandable struts are formed of a metal.

15. The embolic protection filter of claim 14, wherein said metal is nickel-titanium alloy.

16. The embolic protection filter of claim 12, further including a plurality of retrieval struts each having a proximal end and a distal end, the proximal end attached the first tubular member, the distal end attached to the support hoop.

17. The embolic protection filter of claim 12, wherein said support hoop has a pre-formed shape.

18. The embolic protection filter of claim 12, wherein the tapered proximal section of said inverted membrane is disposed proximal the support hoop.

19. The embolic protection filter of claim 1, further comprising a delivery sheath having an inner lumen adapted to contain the embolic protection filter in a collapsed position.

20. An embolic protection filter comprising:

a filter frame disposable about a guidewire;

a support hoop coupled to a plurality of expandable struts, said plurality of expandable struts biased to expand in an outward direction within a body lumen; and

an inverted membrane attached to the support hoop and a portion of said filter frame, said inverted membrane having a tapered proximal section and an enlarged diameter distal section.

21. The embolic protection filter of claim 20, wherein said filter frame comprises a first tubular member disposable about the guidewire, and a second tubular member disposable about the guidewire distal the first tubular member.

22. The embolic protection filter of claim 20, further including a plurality of retrieval struts each having a proximal end and a distal end, the proximal end attached the first tubular member, the distal end attached to the support hoop.

23. The embolic protection filter of claim 20, wherein a portion of said filter frame is secured to the guidewire.

24. The embolic protection filter of claim 20, wherein said guidewire further includes a distal stop, and wherein the filter frame is slidably and rotationally disposed about the guidewire.

25. The embolic protection filter of claim 20, wherein said plurality of expandable struts are biased to self-expand within the body lumen.

26. The embolic protection filter of claim 20, wherein said plurality of expandable struts are formed of a metal.

27. The embolic protection filter of claim 26, wherein said metal is nickel-titanium alloy.

28. The embolic protection filter of claim 20, wherein said inverted membrane is a microporous membrane.

29. The embolic protection filter of claim 28, wherein said microporous membrane is comprised of a polymeric material.

30. The embolic protection filter of claim 29, wherein said polymeric material is selected from the group consisting of polypropylene, polyvinylchloride, polyamide, polyurethane, polyester, polyethylene tetraphlalate, polyether-ether ketone, polyether block amide and polytetrafluoroethylene.

31. The embolic protection filter of claim 20, wherein said inverted membrane comprises a mesh screen.

32. The embolic protection filter of claim 31, wherein said mesh screen is formed of a metal.

33. The embolic protection filter of claim 32, wherein said metal is selected from the group consisting of stainless steel, nickel-titanium alloy and platinum.

34. The embolic protection filter of claim 20, wherein said support hoop has a pre-formed shape.

35. The embolic protection filter of claim 20, further comprising a delivery sheath having an inner lumen adapted to contain the embolic protection filter in a collapsed position.

36. The embolic protection filter of claim 20, wherein the tapered proximal section of said inverted membrane is disposed proximal the support hoop.

37. The embolic protection filter of claim 20, wherein said inverted membrane is substantially conical in shape.

38. An embolic protection filter comprising:

a guidewire having a proximal end and a distal end;

a filter frame disposable about the guidewire, said filter frame comprising a first tubular member disposable about the guidewire, and a second tubular member disposable about the guidewire distal the first tubular member;

a support hoop coupled to a plurality of self-expanding struts, said plurality of self-expanding struts biased to radially expand with a body lumen; and

an inverted membrane attached to the support hoop and a portion of said filter frame, said inverted membrane having a tapered proximal section and an enlarged diameter distal section.

39. The embolic protection filter of claim 38, wherein the first tubular member is secured to the guidewire.

40. The embolic protection filter of claim 38, wherein said guidewire further includes a distal stop, and wherein the filter frame is slidably and rotationally disposed about the guidewire.

41. The embolic protection filter of claim 38, wherein said plurality of self-expanding struts are formed of a metal.

42. The embolic protection filter of claim 41, wherein said metal is nickel-titanium alloy.

43. The embolic protection filter of claim 38, wherein said inverted membrane is a microporous membrane.

44. The embolic protection filter of claim 43, wherein said microporous membrane is comprised of a polymeric material.

45. The embolic protection filter of claim 44, wherein said polymeric material is selected from the group consisting of polypropylene, polyvinylchloride, polyamide, polyurethane, polyester, polyethylene tetraphlalate, polyether-ether ketone, polyether block amide and polytetrafluoroethylene.

46. The embolic protection filter of claim 38, wherein said inverted membrane comprises a mesh screen.

47. The embolic protection filter of claim 46, wherein said mesh screen is formed of a metal.

48. The embolic protection filter of claim 47, wherein said metal is selected from the group consisting of stainless steel, nickel-titanium alloy and platinum.

49. The embolic protection filter of claim 38, wherein said support hoop has a pre-formed shape.

50. The embolic protection filter of claim 38, further comprising a delivery sheath having an inner lumen adapted to contain the embolic protection filter in a collapsed position.

51. The embolic protection filter of claim 38, wherein the tapered proximal section of said inverted membrane is disposed proximal the support hoop.

52. The embolic protection filter of claim 38, wherein said inverted membrane is substantially conical in shape.