Medical device

• US 6,565,591 B2
• Filed: 06/25/2001
• Issued: 05/20/2003
• Est. Priority Date: 06/23/2000
• Status: Expired due to Term

• Current Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Original Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Inventors: Brady, Eamon, Kelly, Ronald
• Primary Examiner(s): Lindsey, Rodney M.
• Application Number:
  US09/887,893
• Publication Number:
  US 20020042627A1
• Time in Patent Office: 694 Days
• Field of Search: 606/200, 606/114, 606/127, 606/194, 606/198
• US Class Current: 606/200
• CPC Class Codes: A61F 2/013 Distal protection devices, i.e. devices placed distally in combination with another endovascular procedure, e.g. angioplasty or stenting
• 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

A collapsible filter element (40) for a transcatheter embolic protection device (1). The filter element (40) comprises a collapsible filter body (41) which is movable between a collapsed stored position for movement through a vascular system and an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element (40). A proximal inlet portion of the filter body (41) has two inlet openings (50) sized to allow blood and embolic material enter the filter body (41), and a distal outlet portion of the filter body (41) has a plurality of small outlet openings (51) to allow through-passage of blood, but to retain embolic material within the filter body (41). The filter body (41) is of an oriented polymeric material.

Claims

1. A collapsible filter element for a transcatheter embolic protection device, the filter element comprising:

a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system and an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element;

a proximal inlet portion of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body;

a distal outlet portion of the filter body having a plurality of outlet openings to allow through-passage of blood, but to retain embolic material within the filter body; and

the filter body including a polymeric material having stored orientations.

2. A filter element as claimed in claim 1 comprising a collapsible support frame, the support frame being movable between a collapsed position for movement through the vascular system and an extended outwardly projecting position to support the filter body in the expanded position.

3. A filter element as claimed in claim 2 wherein the filter body is independent of the support frame.

4. A filter element as claimed in claim 1 wherein the filter body comprises a membrane.

5. A filter element as claimed in claim 1 wherein the filter body has a stored axial orientation in excess of 15%.

6. A filter element as claimed in claim 1 wherein the filter body has a stored axial orientation in excess of 20%.

7. A filter element as claimed in claim 1 wherein the filter body has a stored axial orientation in excess of 30%.

8. A filter element as claimed in claim 1 wherein the filter body has a stored axial orientation in excess of 40%.

9. A filter element as claimed in claim 2 wherein the frame comprises a plurality of engagement segments, the engagement segments being spaced-apart longitudinally and transversely when the filter is in the deployed expanded configuration to urge the filter body into apposition with the vessel wall.

10. A filter element as claimed in claim 9 wherein the engagement segments define at least one at least partially substantially helical engagement track.

11. A filter element as claimed in claim 1 wherein the ultimate tensile strength of the oriented polymeric material of the filter body is at least 15,000 psi (103.425 MPa).

12. A filter element as claimed in claim 11 wherein the ultimate tensile strength is at least 25,000 psi (172.375 MPa).

13. A filter element as claimed in claim 11 wherein the ultimate tensile strength is at least 35,000 psi (241.325 MPa).

14. A filter element as claimed in claim 11 wherein the ultimate tensile strength is at least 40,000 psi (275.8 MPa).

15. A filter element as claimed in claim 1 wherein the material of the filter body is of polyester or polyamide.

16. A filter element as claimed in claim 1 wherein the material of the filter body is of polyester.

17. A filter element as claimed in claim 1 wherein the material of the filter body is selected from polyethyleneterephthalate (PET), polybutyleneterephthalate (PBT) and polynapthylterephthalate (PNT).

18. A filter element as claimed in claim 1 wherein the material of the filter body is of PET.

19. A filter element as claimed in claim 1 wherein the material of the filter body is of polyamide.

20. A filter element as claimed in claim 1 wherein the material of the filter body is an elastomer.

21. A filter element as claimed in claim 1 wherein the material of the filter body is a polyurethane.

22. A filter element as claimed in claim 1 wherein the polymeric material of the filter body is oriented at a temperature below the glass transition temperature of the material.

23. A filter element as claimed in claim 1 wherein the material of the filter body is oriented by stretch blow moulding.

24. A filter element as claimed in claim 1 wherein the filter body comprises a proximal body section, a distal section and an intermediate body section interconnecting the proximal and distal body sections.

25. A collapsible filter element for a transcatheter embolic protection device, the filter element comprising:

a collapsible filter body which is movable between a collapsed stored position for movement through a vascular system and an expanded position for extension across a blood vessel such that blood passing through the blood vessel is delivered through the filter element;

a proximal inlet portion of the filter body having one or more inlet openings sized to allow blood and embolic material enter the filter body;

a distal outlet portion of the filter body having a plurality of outlet openings to allow through-passage of blood, but to retain embolic material within the filter body; and

the filter body including a polymeric material having stored biaxial orientations.

26. A filter element as claimed in claim 25 wherein the filter body has a stored biaxial orientation in excess of 30%.

27. A filter element as claimed in claim 25 wherein the filter body has a stored biaxial orientation in excess of 60%.

28. A filter element as claimed in claim 25 wherein the filter body has a stored biaxial orientation in excess of 80%.

29. A filter element as claimed in claim 25 wherein the filter body has a stored biaxial orientation in excess of 100%.