Clot retrieval device for removing clot from a blood vessel

Patent metadata

Field	Value
Publication number	US-11439418-B2
Application number	US-202016946467-A
Country	US
Kind code	B2
Filing date	Jun 23, 2020
Priority date	Jun 23, 2020
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

A clot retrieval device is disclosed to remove clot from a blood vessel. The device can include a collapsed configuration and an expanded configuration. The device can include an inner expandable body with a framework of struts. The device can include an outer expandable body with a framework of struts that at least partially radially surrounding the inner expandable body. A distal portion of the outer expandable body can extend in the deployed configuration towards the outer expandable body to a greater extent than the inner expandable body, closed cells of the distal portion distally tapering and being smaller than cells proximal thereof in the outer expandable body. The plurality of closed cells of the distal portion can include a pair of axially aligned smaller diamond shaped cells formed by struts of the distal portion and positioned along upper and lower regions of the distal portion.

First claim

What is claimed is:

1. A clot retrieval device to remove a clot from a blood vessel, the device comprising a collapsed configuration and an expanded configuration and comprising:
an inner expandable body comprising a framework of struts that form closed cells; and
an outer expandable body comprising a framework of struts that form closed cells larger than the closed cells of the inner expandable body and at least partially radially surrounding the inner expandable body, the outer expandable body comprising a distal scaffolding zone comprising a plurality of struts that distally taper with closed cells smaller than cells proximal thereof in the outer expandable body;
the plurality of closed cells of the distal scaffolding zone comprising:
a radially aligned and joined group of a first plurality of closed cells being axially aligned small diamond shaped cells formed by struts of the distal scaffolding zone;
a radially aligned and joined group of a second plurality of closed cells being larger than cells of the first plurality of pentagon-shaped closed cells and radially separated, each small diamond shaped cell being radially inward, distal, and adjacent to the second plurality of closed cells; and
a third plurality of closed cells radially separated and proximal of each of the second plurality of closed cells;

wherein each of the second plurality of closed cells share common edges with two of the first plurality of closed cells; and
wherein each of the first plurality of closed cells share common edges with two of the second plurality of closed cells.

2. The device of claim 1 , the first plurality of closed cells comprising a different shape than the second plurality of cells; and
the second plurality of closed cells comprising a different shape than the third plurality of closed cells.

3. The device of claim 1 , the distal scaffolding zone being a protective strut structure comprising at least twelve closed cells between the first, second, and third plurality of closed cells.

4. The device of claim 1 , the first plurality of closed cells being a pair of axially aligned small diamond shaped cells formed by struts of the distal portion and positioned along upper and lower regions of the distal scaffolding zone.

5. The device of claim 4 , each diamond shaped cell comprising a best fit diameter of approximately 1.2 mm.

6. The device of claim 4 , the second plurality of closed cells comprising at least four cells.

7. The device of claim 6 , the at least four cells comprising a best fit diameter of approximately 1.6 mm.

8. The device of claim 6 , each of the at least four cells sharing only one common edge with one of the small diamond shaped cells.

9. The device of claim 6 , the third plurality of closed cells comprising at least five radially separated cells proximal of the second plurality of cells.

10. A clot retrieval device to remove a clot from a blood vessel, the device comprising a collapsed configuration and an expanded configuration, and comprising:
an inner expandable body comprising a framework of struts; and
an outer expandable body comprising a framework of struts that at least partially radially surround the inner expandable body; and
a distal portion of the outer expandable body that extends in a radially outward direction in the expanded configuration, wherein small diamond shaped closed cells of the distal portion distally taper and are smaller than pentagon-shaped large closed cells adjacent proximal thereof;
the small diamond shaped closed cells of the distal portion comprising axially aligned cells formed by struts of the distal portion and positioned along upper and lower regions of the distal portion; and
wherein each of small diamond shaped closed cells share common edges with two of the large closed cells; and
wherein each of the large closed cells share common edges with two of the small diamond shaped closed cells.

11. The device of claim 10 , wherein the distal portion being a protective strut structure comprises at least twelve closed cells.

12. The device of claim 10 , wherein the large pentagon-shaped closed cells of the distal portion comprises at least four radially separated large cells, each small diamond shaped cell being radially inward and distal of the at least four radially separated large cells.

13. The device of claim 12 , wherein the at least four radially separated large cells comprise a best fit diameter of approximately 1.6 mm.

14. The device of claim 12 , wherein each of the at least four radially separated large cells share only one common edge with one of the small diamond shaped cells.

15. The device of claim 12 , wherein the closed cells of the distal portion comprise at least five radially separated cells proximal of the at least four radially separated large cells.

16. The device of claim 10 , wherein the framework of struts of the outer expandable body comprise a plurality of discontinuous expandable members spaced from adjacent expandable members, struts of each expandable forming closed cells with at least some struts terminating in radially separated distal apexes free from connection to an adjacent closed cell, each member comprising at least four radiopaque markers equally radially separated about a longitudinal axis of the outer expandable body.

17. The device of claim 16 , wherein the at least four radiopaque markers are separated approximately 10 mm apart in the collapsed configuration.

18. The device of claim 16 , wherein the at least four radiopaque markers radiopaque markers comprise at least one of Barium Sulphate, Bismuth SubCarbonate, Barium OxyChloride, Gold, Tungsten, Platinum, Iridium, Tantalum or an alloy of these materials.

Assignees

• Neuravi Ltd

Inventors

• O'Malley Thomas
• Duffy Aidan
• Lee Declan
• Smullin Annalisa
• Gunning Gillian
• O'Keeffe Diarmaid

Classifications

• A61B2017/22067

  Blocking; Occlusion (A61B2017/22054 takes precedence) · CPC title

• A61B2017/22035

  for retrieving or repositioning foreign objects · CPC title

• A61B2017/2217

  single wire changing shape to a gripping configuration · CPC title

• A61B2017/22034

  for gripping the obstruction or the tissue part from inside · CPC title

• A61B2017/00867

  shape memory effect · CPC title