REMOVABLE BLOOD CLOT FILTER WITH EDGE FOR CUTTING THROUGH THE ENDOTHELIUM

• US 20090209996A1
• Filed: 12/29/2006
• Published: 08/20/2009
• Est. Priority Date: 12/30/2005
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Chanduszko, Andrzej J., Kashkarov, Alexander Germanovich
• Granted Patent: US 8,317,818 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/0105 Open ended, i.e. legs gathered only at one side
• CPC Class Codes: A61F 2002/016 made from wire-like elements
• CPC Class Codes: A61F 2230/005 Rosette-shaped, e.g. star-shaped
• CPC Class Codes: A61F 2230/0067 conical
• CPC Class Codes: A61F 2230/008 paraboloidal
• CPC Class Codes: Y10T 29/49826 Assembling or joining

Abstract

A removable blood clot filter includes anchor members with a sharp edge configured so that when the filter is removed the sharp edge aids in passing the anchor members through endothelial tissue. The filter may also include a sharp edge on locator members configured to aid pulling the locator members away from the endothelial tissue.

Claims

1. A removable filter to be placed in a flow of blood through a blood vessel, the filter comprising:

a plurality of filter members; and

a sharp edge spanning at least a portion of at least one of the filter members.

2. The filter according to claim 1, wherein the sharp edge extends over a portion of the at least one filter member adjacent to a wall of the blood vessel when the filter is positioned in the blood vessel.

3. The filter member according to claim 1, wherein the at least one filter member also includes a locator member.

4. The filter according to claim 1, wherein the at least one filter member is an anchor member having a hook formed on a distal end.

5. The filter member according to claim 4, wherein the sharp edge extends over a portion of the hook.

6. The filter member according to claim 4, wherein the anchor member further includes a second sharp edge over at least a portion of the anchor member.

7. The filter member according to claim 4, wherein the anchor member further includes a third sharp edge over at least a portion of the anchor member.

8. The filter member according to claim 1, wherein the sharp edge projects toward a longitudinal axis of the filter.

9. The filter member according to claim 1, wherein the sharp edge is formed by removing a portion of the filter member.

10. The filter member according to claim 1, wherein the sharp edge is formed by wrapping a foil about the filter member.

11. A filter to be placed in a blood vessel, the filter comprising:

a hub disposed along a longitudinal axis;

a plurality of anchor members branching from the hub, each anchor member including;

a hook that (i) is configured to penetrate a wall of the blood vessel, (ii) is spaced along the longitudinal axis from the hub, and (iii) is radially spaced from the longitudinal axis a first distance; and

a sharp edge over a portion of the anchor member and the hook; and

a plurality of locator members branching from the hub.

12. The filter according to claim 11, wherein each locator member includes:

a base portion proximate the hub;

a first portion that extends from the base portion and along a first axis;

a second portion that extends from the first portion and along a second axis, which is distinct from the first axis; and

a tip portion that extends from the second portion and along a tip axis, which is distinct from the first and second axes, the tip portion (i) is configured to engage the wall of the blood vessel, (ii) is spaced along the longitudinal axis from the hub, and (iii) is radially spaced from the longitudinal axis a second distance, which is less than the first radial distance.

13. The filter according to claim 12, wherein each locator member further includes on the tip portion a sharp edge projecting toward the longitudinal axis.

14. The filter according to claim 13, wherein the sharp edge on each anchor projects toward the longitudinal axis.

15. The filter according to claim 11, wherein the anchor member further includes a second sharp edge over a length of the anchor member.

16. The filter according to claim 11, wherein the anchor member further includes a third sharp edge over a length of the anchor member.

17. A method of manufacturing a filter, the method comprising:

providing at least one filter member; and

forming a sharp edge on the at least one filter member.

18. The method of claim 17, wherein forming a sharp edge comprises removing material from the at least one filter member.

19. The method of claim 17, wherein forming a sharp edge comprises adding material to the at least one filter member.

20. The method of claim 19, wherein material is added to the at least one filter member by wrapping the filter member with a foil so ends of the foil form the sharp edge.

21. The method of claim 19, wherein the forming comprises folding a generally planar member about an axis to define at least one sharp edge.

22. A method of removing a filter from a blood vessel, the filter having at least one anchor member disposed about a longitudinal axis and having a migration resistance force, the method comprising:

cutting through biological tissue adjacent the anchor member to define a sharp separation in the tissue adjacent the anchor member; and

overcoming the resistance force.

23. The method of claim 22, wherein the cutting comprises moving the anchor member toward a longitudinal axis.

24. The method of claim 23, further comprising withdrawing the filter into a recovery catheter.