SELF FURLING UMBRELLA FRAME FOR CAROTID FILTER

• US 20080077175A1
• Filed: 12/06/2007
• Published: 03/27/2008
• Est. Priority Date: 08/30/2001
• Status: Active Grant

• Current Assignee: Abbott Cardiovascular Systems Incorporated (Abbott Laboratories)
• Original Assignee: Advanced Cardiovascular Systems Incorporated (Abbott Laboratories)
• Inventors: Palmer, Olin
• Granted Patent: US 7,959,647 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/01 Filters implantable into blood vessels
• 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 2230/008 paraboloidal
• CPC Class Codes: A61F 2230/0086 Pyramidal, tetrahedral, or wedge-shaped
• CPC Class Codes: A61M 2025/1004 Balloons with folds, e.g. folded or multifolded

Abstract

A capture device for removal of clots and foreign bodies from vasculature or filtering of particulate from blood flow. The parachute-like capture device is connected to an elongate wire located within a longitudinally elongated tubular member. The invention provides a capture device that is radially expandable and a method for refolding the capture device into a reduced profile during contraction. Thereby, providing an atraumatic retraction of the capture device from within the vasculature.

Claims

1. A system for capturing embolic or foreign material in a vessel, comprising:

an elongate tubular member having a proximal end and a distal end;

an elongate wire having a proximal end and a distal end, the elongate wire being positionable within the elongate tubular member;

a capturing structure operatively connected to the elongate wire having an expanded condition and a contracted position, the capturing structure further having an inner surface and an outer surface forming a parachute like structure in the expanded condition;

a plurality of first struts having proximal ends and distal ends, the distal ends being attached to the capturing structure inner surface and the proximal ends being attached to the elongated wire, the proximal ends including a partial helix configuration; and

a plurality of second struts having proximal ends and distal ends, the distal ends being attached to the capturing structure outer surface and the proximal ends being attached to the elongated wire, the proximal ends including a partial helix configuration.

2. The system of claim 1, wherein the capturing structure assumes a folded position in the contracted condition.

3. The system of claim 2, wherein the capturing structure assumes the folded condition as the second struts rotate with respect to the first struts.

4. The system of claim 2, wherein the first struts and second struts move relative to each other during contraction.

5. The system of claim 2, wherein the first struts and second struts move in the same direction during contraction.

6. The system of claim 1, wherein the capture device expands radially with respect to the elongate wire into a generally parachute-like member having a proximal end and a distal end, wherein the proximal end is defined by an orifice through which blood can flow.

7. The system of claim 1, wherein the plurality of first struts and second struts are biased radially outward.

8. The system of claim 1, wherein the orifice can be made to close by retracting the distal end of the elongate wire member proximally, refolding the capture device and reducing the profile for an atraumatic retraction of the device.

9. The system of claim 1, the capturing structure comprising a mesh structure.

10. The system of claim 1, the capturing structure comprising a membrane.

11. The system of claim 1, wherein the capturing structure has at least one pore that is sized to allow the substantially unimpeded flow of blood therethrough.

12. A system for capturing embolic or foreign material in a vessel, comprising:

an elongate tubular member having a proximal end and a distal end;

an elongate wire having a proximal end and a distal end, the elongate wire being positionable within the elongate tubular member;

a capturing structure operatively connected to the elongate wire, having an expanded condition and a contracted position, the capturing structure further having an inner surface and an outer surface forming a parachute-like structure in the expanded condition;

a plurality of first struts attached to the capturing structure inner surface and a plurality of second struts attached to the capturing structure outer surface; and

the capture device assuming a self folding position in the contracted condition as the second struts rotate with respect to the first struts.

13. The system of claim 12, wherein the capture device expands radially with respect to the elongate wire into a generally parachute-like member having a proximal end and a distal end, the proximal end further comprising an orifice or plurality of orifices through which blood can flow.

14. The system of claim 12, wherein the first and second struts are configured in an alternating pattern when in an expanded configuration.

15. The system of claim 12, wherein the first and second struts are biased radially outward.

16. The system of claim 12, wherein the first struts are attached to the elongate wire.

17. The system of claim 12, wherein the second struts are attached to the elongate wire.

18. The system of claim 12, the first struts and the second struts further comprising nitinol.

19. The system of claim 12, the capture device further comprises an orifice, wherein the orifice can be made to contract by retracting the distal end of the elongate wire member with respect to the elongate tubular member.

20. The system of claim 12, the first or second struts further comprising a slight helix at a proximal end thereof.

21. The system of claim 12, the first and second struts further comprising a slight helix at a proximal end thereof.

22. The system of claim 12, wherein the first and second struts move relative to each other during contraction.

23. The system of claim 12, wherein the first and second struts move in the same direction during contraction.

24. The system of claim 12, the capturing structure further comprising a semi-permeable membrane.

25. The system of claim 12, the capturing structure comprising a mesh structure.

26. The system of claim 12, the capturing structure further comprising at least one pore that is sized to allow the substantially unimpeded flow of blood therethrough.

27. The system of claim 12, wherein the elongate tubular member is a microcatheter.

28. The system of claim 12, the capturing structure further comprising a knitted structure.

29. A method for refolding and atraumatically retracting an embolic capturing device after deployment into a vessel, comprising:

providing a parachute-like capture device having a capturing structure operatively connected to an elongate wire, the capture device further including a frame having a plurality of first struts and a plurality of second struts which expand radially, wherein the inner and outer struts having a proximal and distal end are configured in an alternative pattern where one inner strut is dispersed between two outer struts;

contracting the capture device by retracting the elongate wire proximally within a catheter wherein the second struts having a slight helix at the proximal end rotate relative to the first strut thereby folding the parachute-like capture device and retaining the captured material; and

retracting the refolded capture device within the catheter.

30. The method of claim 29, wherein the first strut further comprising a slight helix configuration at the proximal end rotate relative to the second strut thereby folding the parachute-like capture device.

31. The method of claim 29, wherein the first and second struts move relative to each other during contraction.

32. The method of claim 29, wherein the first and second struts move in the same direction during contraction.