LOOPED CLOT RETRIEVER WIRE

• US 20140330302A1
• Filed: 05/01/2014
• Published: 11/06/2014
• Est. Priority Date: 05/01/2013
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Inventors: Tekulve, Kurt, Turk, Tyler, Wu, Yunjuan
• Granted Patent: US 10,111,676 B2
• Time in Patent Office: Days
• US Class Current: 606/200
• CPC Class Codes: A61B 17/221 Gripping devices in the form of loops or baskets for gripping calculi or similar types of obstructions surgical snare instruments A61B17/32056
• CPC Class Codes: A61B 2017/2212 having a closed distal end, e.g. a loop

Abstract

A clot retrieval system for removing clots from a body lumen. The clot retrieval system includes an elongated sheath and a wire assembly. The wire assembly is comprised of four wire segments, each biased to have a distally extending circumferential curve. Two wire segments are connected together at a proximal end and a distal end to form a first loop, and are connected to a shaft. Two other wire segments are connected together at a proximal end and a distal end to form a second loop and are connected to the first two wire segments. The second loop is covered with a membrane to catch clots. The wire assembly may be compacted by retracting it within the elongated sheath, or expanded by extending it from the elongated sheath.

Claims

1. A clot retrieval system comprising:

an elongated sheath having a lumen disposed therein, the lumen having an inner diameter;

a wire assembly disposed within the elongated sheath, the wire assembly comprising a straight section and a curved section, a distal end of the straight section connected to a proximal end of the curved section, the curved section being comprised of a first wire segment extending distally from the proximal end of the curved section and biased to curve in a first circumferential direction, a second wire segment extending distally from the proximal end of the curved section and biased to curve in a second circumferential direction opposite the first circumferential direction, the first wire segment and second wire segment forming a first loop having a first loop proximal end and a first loop distal end, the first wire segment being connected to the second wire segment at the first loop proximal end and the first loop distal end, a third wire segment extending distally from the first loop proximal end and biased to curve in the first circumferential direction, a fourth wire segment extending distally from the first loop proximal end and biased to curve in the second circumferential direction, the third wire segment and fourth wire segment forming a second loop having a second loop proximal end and a second loop distal end, the third wire segment being connected to the fourth wire segment at the second loop proximal end and the second loop distal end; and

a membrane secured to the third wire segment and the fourth wire segment, the membrane bridging the second loop.

2. The clot retrieval system of claim 1, further comprising a first fastener connecting the first wire segment and the second wire segment at the first loop proximal end, a second fastener connecting the first wire segment and the second wire segment as the first loop distal end and the third wire segment and the fourth wire segment at the second loop proximal end, and a third fastener connecting the third wire segment and the fourth wire segment at the second loop distal end.

3. The clot retrieval system of claim 2, wherein the first fastener, second fastener, and third fastener are selected from the group consisting of a solder joint, a weld, a band, and a coil.

4. The clot retrieval system of claim 1 wherein the membrane comprises a polymer film.

5. The clot retrieval system of claim 1 further comprising a mesh secured to the first wire segment and the second wire segment, the mesh bridging the first loop.

6. The clot retrieval system of claim 5 wherein the mesh comprises a plurality of woven nickel titanium strands.

7. The clot retrieval system of claim 1 further wherein the wire assembly further comprises a distal section connected to the distal end of the second loop, the distal section comprising a conical tip.

8. The clot retrieval system of claim 1 wherein the first wire segment, the second wire segment, the third wire segment, and the fourth wire segment comprise a single wire.

9. The clot retrieval system of claim 1 wherein the curved section has only two loops.

10. A looped wire assembly comprising:

a straight section comprising a shaft having a shaft distal end and a shaft proximal end;

a first wire segment connected to the shaft distal end and extending distally and biased to curve in a first circumferential direction;

a second wire segment connected to the shaft distal end and extending distally and biased to curve in a second circumferential direction opposite the first circumferential direction, the first wire segment and second wire segment forming a first loop having a first loop proximal end and a first loop distal end, the first wire segment being connected to the second wire segment at the first loop proximal end and the first loop distal end;

a third wire segment connected to the first loop proximal end and extending distally and biased to curve in the first circumferential direction,

a fourth wire segment connected to the first loop proximal end and extending distally and biased to curve in the second circumferential direction, the third wire segment and the fourth wire segment forming a second loop having a second loop proximal end and a second loop distal end, the third wire segment being connected to the fourth wire segment at the second loop proximal end and the second loop distal end; and

a membrane secured to the third wire segment and the fourth wire segment bridging the second loop.

11. The looped wire assembly of claim 10 wherein the first wire segment, the second wire segment, the third wire segment, and the fourth wire segment are segments of a single looped wire.

12. The looped wire assembly of claim 10 wherein the first wire segment and the third wire segment comprise a first wire, and the second wire segment and the fourth wire segment comprise a second wire.

13. The looped wire assembly of claim 10 further comprising a distal section comprising a distally extending shaft connected to the second loop distal end.

14. The looped wire assembly of claim 13 further wherein the distal section is encapsulated in a soft material.

15. The looped wire assembly of claim 14 wherein the soft material forms a conical tip.

16. The looped wire assembly of claim 10 further comprising a mesh material connecting the first wire segment to the second wire segment to span the first loop.

17. The looped wire assembly of claim 16 wherein the mesh material comprises a plurality of interwoven strands of a nickel titanium alloy.

18. The looped wire assembly of claim 10 further comprising a first fastener connecting the shaft to the first and second wire segment.

19. The looped wire assembly of claim 18 further comprising a second fastener connecting the first wire segment to the second wire segment and the third wire segment to the fourth wire segment.

20. The looped wire assembly of claim 18 wherein the first fastener is selected from the group consisting of a solder joint, a weld, a band, and a coil.