Medical device

• US 7,819,893 B2
• Filed: 10/22/2008
• Issued: 10/26/2010
• Est. Priority Date: 06/23/2000
• Status: Expired due to Fees

• Current Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Original Assignee: Salviac Ltd. (Abbott Laboratories Incorporated)
• Inventors: Kelly, Ronald, Brady, Eamon
• Primary Examiner(s): HUSON, MONICA ANNE
• Application Number:
  US12/256,205
• Publication Number:
  US 20090054924A1
• Time in Patent Office: 734 Days
• Field of Search: None
• 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 2002/018 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;

the filter element being pre-wrapped in a ordered configuration which can eliminate air emboli in the loading process and the filter body comprising a thin membrane.

2. A filter element as claimed in claim 1 comprising a wrapping configuration with 4 points of folding.

3. 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.

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

5. A filter element as claimed in claim 3 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.

6. A filter element as claimed in claim 5 wherein the engagement segments define at least one at least partially substantially helical engagement track.

7. A filter element as claimed in claim 1 wherein the thin membrane comprises a polyamide having stored orientations.

8. A filter element as claimed in claim 7 wherein the filter body has a stored axial orientation in excess of 15%.

9. A filter element as claimed in claim 7 wherein the filter body has a stored axial orientation in excess of 20%.

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

11. A filter element as claimed in claim 7 wherein the filter body has a stored axial orientation in excess of 40%.

12. A filter element as claimed in claim 7 wherein the ultimate tensile strength of the oriented polyamide of the filter body is at least 15,000 psi (103.425 MPa).

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

14. A filter element as claimed in claim 12 wherein the ultimate tensile strength is at least 35,000 psi (241.325 MPa).

15. A filter element as claimed in claim 12 wherein the ultimate tensile strength is at least 40,000 psi (275.8 MPa).

16. A filter element as claimed in claim 7 wherein the polyamide of the filter body is oriented at a temperature below the glass transition temperature of the material.

17. A filter element as claimed in claim 7 wherein the polyamide of the filter body is oriented by stretch blow moulding.

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

19. A filter element as claimed in claim 7 wherein the polyamide is biaxially oriented.

20. A filter element as claimed in claim 19 wherein the filter body has a stored biaxial of orientation in excess of 30%.

21. A filter element as claimed in claim 19 wherein the filter body has a stored biaxial of orientation in excess of 60%.

22. A filter element as claimed in claim 19 wherein the filter body has a stored biaxial orientation in excess of 80%.

23. A filter element as claimed in claim 19 wherein the filter body has a stored biaxial of orientation of 100%.