Invertible filter for embolic protection

• US 8,252,017 B2
• Filed: 10/13/2006
• Issued: 08/28/2012
• Est. Priority Date: 10/18/2005
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Paul, Ram H. Jr., Brumleve, John A.
• Primary Examiner(s): Sonnett, Kathleen
• Assistant Examiner(s): TANNER, JOCELIN C
• Application Number:
  US11/580,546
• Publication Number:
  US 20070112374A1
• Time in Patent Office: 2,146 Days
• Field of Search: 606/200, 606/191, 606/155, 606/213, 606/215, 606110-115, 606/127, 606/128, 606/108, 606/106, 606/107, 623/1.12, 623/1.11, 600/585, 600/434
• US Class Current: 606/200
• CPC Class Codes: A61F 2/011 Instruments for their placement or removal
• 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 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• 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 2230/0078 hyperboloidal
• CPC Class Codes: A61F 2230/008 paraboloidal

Abstract

A medical device including a guiding member and a filter portion is disclosed. The guiding member includes a lumen configured to slidably engage the filter portion. The filter portion forms a tubular geometry that extends distally from the guiding member. The filter portion is configured to evert to form a proximally facing concave geometry for capturing emboli. Further, the filter portion includes filter openings that are sized to allow blood cells to pass therethrough while preventing the passage of emboli.

Claims

1. A medical device for capturing emboli in a blood vessel, the medical device comprising:

a guiding member including a lumen sized to receive an advancement member, an outer surface, a distal end, and a plurality of control wire openings proximal to the distal end;

a filter portion having a tubular geometry and a plurality of filter openings, the tubular geometry having a first end opening at a first end and a second end opening at a second end, the first end extending distally from the guiding member, the second end being fixedly attached to the advancement member;

a plurality of control wires attached to the filter portion and extending proximally from the first end of the filter portion, wherein the plurality of control wires are received into the lumen of the guiding member through the plurality of control wire openings; and

wherein the filter portion has a non-everted state and an everted state, the filter portion being configured to evert by pulling the first end back over the filter portion so that the filter portion forms a proximally facing concave geometry with the first end forming a proximally facing opening; and

wherein the everted state of the filter portion has an expanded state and a collapsed state, wherein the first end of the filter portion is drawn against the outer surface of the guiding member by proximal movement of the control wires and the second end of the filter portion is disposed within the lumen of the guiding member when the filter portion is in the collapsed state, such that the distal end of the guiding member is disposed within the concave geometry of the filter portion when the filter portion is in the collapsed state.

2. The medical device according to claim 1, wherein the filter portion includes a plurality of elements, the elements being interwoven such that the filter portion expands to circumferentially engage an inner wall of the blood vessel when everted.

3. The medical device according to claim 2, wherein the plurality of elements define the plurality of filter openings.

4. The medical device according to claim 3, the plurality of filter openings are sized to allow blood cells to pass through the filter openings and prevent the passage of emboli.

5. The medical device according to claim 1, wherein the filter portion is comprised of a shape memory material.

6. The medical device according to claim 1, wherein the plurality of control wires are comprised of a shape memory material.

7. The medical device according to claim 1, wherein the proximally facing concave geometry has an annular collection region.

8. The medical device according to claim 7, wherein the annular collection region is spaced from the blood vessel.

9. A medical device for capturing emboli in a blood vessel, the medical device comprising:

a guiding member including a lumen sized to receive an advancement member, an outer surface, a distal end, and a plurality of control wire openings proximal to the distal end;

a filter portion having a tubular geometry and a plurality of filter openings, the tubular geometry having a first and second end, the first end extending distally from the guiding member;

the second end being fixedly attached to the advancement member;

a plurality of control wires attached to the filter portion and extending proximally from the first end of the filter portion, wherein the plurality of control wires are received into the lumen of the guiding member through the plurality of control wire openings; and

wherein the filter portion has a non-everted state and an everted state, the filter portion being configured to evert by proximal movement of the control wires, the proximal movement of the control wires pulling the first end back over the filter portion so that the filter portion forms a proximally facing concave geometry with the first end forming a proximally facing opening, the filter portion including a plurality of elements interwoven such that the filter portion expands to circumferentially engage an inner wall of the blood vessel when everted, the plurality of elements defining the plurality of filter openings; and

wherein the everted state of the filter portion has an expanded state and a collapsed state, wherein the first end of the filter portion is drawn against the outer surface of the guiding member by proximal movement of the control wires and the second end of the filter portion is disposed within the lumen of the guiding member when the filter portion is in the collapsed state, such that the distal end of the guiding member is disposed within the concave geometry of the filter portion when the filter portion is in the collapsed state.

10. The medical device according to claim 9, the plurality of filter openings are sized to allow blood cells to pass through the filter openings and prevent the passage of emboli.

11. The medical device according to claim 9, wherein the filter portion is comprised of a shape memory material.

12. The medical device according to claim 9, wherein the plurality of control wires are comprised of a shape memory material.

13. The medical device according to claim 9, wherein the proximally facing concave geometry has an annular collection region and the annular collection region is spaced from the blood vessel.