EMBOLIC PROTECTION DEVICE

• US 20110125180A1
• Filed: 11/25/2009
• Published: 05/26/2011
• Est. Priority Date: 11/25/2009
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Inventors: Zoromski, Michele, Tripp, Grace, Anderson, James
• Granted Patent: US 8,409,240 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• 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

The disclosure relates to an embolic filter, a support structure therefor, and methods for maintaining said filter in a compact state prior to deploying the filter.

Claims

1. An augmented constraint apparatus for delivery and deployment of an intraluminal filter within a lumen comprising:

an elongated support member for an intraluminal filter, said support member having a proximal end, a distal end, and a shaft therebetween;

an intraluminal filter associated with the distal end of the support member, said filter comprising a plurality of outwardly biased struts, said filter having a collapsed state and a deployed state;

a motion restricting member disposed about at least a portion of the outwardly biased struts of the filter in the collapsed state;

a containment structure having two or more apertures therein; and

an activation element having a first position and a second position, wherein in the first position, the activation element engages the two or more apertures of the containment structure and the containment structure encompasses at least a portion of the outwardly biased struts, further wherein in the second position, the activation element is disengaged from at least one of the apertures of the containment structure allowing the intraluminal filter to move from the collapsed state toward the deployed state.

2. The apparatus of claim 1, wherein the filter comprises a filter membrane.

3. The apparatus of claim 1, wherein when the intraluminal filter moves from the collapsed state toward the deployed state, at least a portion of the motion restricting member moves proximally.

4. The apparatus of claim 3, wherein the motion restricting member is a tubular elastomeric member having a distal end, a proximal end, and a lumen therebetween.

5. The apparatus of claim 4, wherein when at least a portion of the motion restricting member moves proximally, the distal end of the tubular elastomeric member moves over the surface of the tubular elastomeric member toward the proximal end of the tubular elastomeric member.

6. The apparatus of claim 4, wherein at least a portion of the proximal end of the tubular elastomeric member is disposed over the support member and remains stationary relative to the support member.

7. The apparatus of claim 3, wherein the motion restricting member is a ring.

8. The apparatus of claim 7, wherein the ring rolls along the outwardly biased struts of the filter as the filter moves from the collapsed state toward the deployed state.

9. The apparatus of claim 7, wherein the ring slides along the outwardly biased struts of the filter as the filter moves from the collapsed state toward the deployed state.

10. The apparatus of claim 9, wherein the dimensions of the ring remain substantially unchanged as the ring slides along the outwardly biased struts of the filter.

11. The apparatus of claim 1, wherein the filter is mounted about a spinner tube disposed about a guidewire.

12. The apparatus of claim 1, further comprising a recovery sheath having a lumen therein, said lumen sized to at least partially contain the collapsed state of the filter, and having a distal opening sized to engage the motion restricting member and advance at least a portion of the motion restricting member over the plurality of outwardly biased struts as the recovery sheath is advanced distally.

13. The apparatus of claim 1, further comprising a second motion restricting member disposed about at least a second portion of the filter, wherein when the intraluminal filter moves from the collapsed state toward the deployed state, at least a portion of the second motion restricting member moves distally.

14. An augmented constraint apparatus for delivery and deployment of an intraluminal filter within a lumen comprising:

a filter comprising a plurality of outwardly biased struts, said struts being joined at least at their proximal ends;

a motion restricting member disposed about at least a portion of the outwardly biased struts, said motion restricting member providing an inward force insufficient to prevent expansion of the filter from a collapsed state to an expanded state; and

a containment structure, wherein the containment structure encompasses at least a portion of the outwardly biased struts and in combination with the motion restricting member provides sufficient inward force to prevent expansion of the filter from a collapsed state to an expanded state until the containment structure is released or removed.

15. The apparatus of claim 14, wherein the filter further comprises a filter membrane.

16. The apparatus of claim 15, wherein the filter membrane comprises a plurality of openings sized to pass blood cells, but retain emboli, thrombi, and other debris.

17. The apparatus of claim 14, wherein the motion restricting member comprises an elastomeric tube.

18. The apparatus of claim 14, wherein the motion restricting member comprises a ring.

19. The apparatus of claim 14, further comprising an elongated support member having a proximal end, a distal end, and a lumen at least partially therebetween.

20. A method of constraining and deploying an intraluminal filter within a lumen comprising the steps of:

providing a plurality of outwardly biased struts;

mounting a filter material about the distal portion of the plurality of outwardly biased struts;

collapsing the filter into a delivery state;

providing a motion restricting member about at least a portion of the outwardly biased struts, said motion restriction member having a first position and a second position, wherein in the first position the motion restricting member provides an inward force insufficient to completely prevent at least partial expansion of the plurality of outwardly biased struts and in the second position at least a portion of the motion restricting member is located proximally of its first position and the plurality of struts is fully expanded;

providing a containment structure which has a first position and a second position wherein in the first position the containment structure at least partially encompasses the plurality of outwardly biased struts and provides an inward force capable of preventing the expansion of the outwardly biased struts when the motion restricting member is in the first position and wherein in the second position, the inward force provided by the containment structure is removed;

positioning the intraluminal filter within a lumen; and

moving the containment structure from its first position to its second position thereby removing at least a portion of the inward force provided by the containment structure and allowing the struts to at least partially expand moving the motion restricting member from its first position to its second position as the filter deploys within the lumen.