Devices and methods for removal of acute blockages from blood vessels

Patent metadata

Field	Value
Publication number	US-11103264-B2
Application number	US-201916248539-A
Country	US
Kind code	B2
Filing date	Jan 15, 2019
Priority date	Mar 14, 2013
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

A clot retrieval device with an elongate shaft and an expandable section, the expandable section having a framework of interconnected strut elements distal of the elongate shaft, the strut elements forming an outer expandable body and an inner expandable body. At least a portion of the strut elements include a first coating of radiopaque material defining a plurality of micro-columns, wherein each micro-column includes a length extending between a first end coupled to one of the plurality of strut elements and a second free end opposite the first end, the length of each micro-column is longer than a width of each micro-column. The second free end is capable of moving further apart when a convex bend is applied to the respective strut element during use. Also including a second coating.

First claim

What is claimed is:

1. A clot retrieval device comprising an elongate shaft and an expandable section, the expandable section comprising:
a framework of interconnected strut elements distal of the elongate shaft, the strut elements forming an outer expandable body and an inner expandable body, at least a portion of the strut elements comprising:
a first coating of radiopaque material defining a plurality of micro-columns, wherein each micro-column includes a length extending between a first end coupled to at least one of the strut elements and a second free end opposite the first end, the length of each micro-column is longer than a width of each micro-column;
wherein the second free ends of the plurality of micro-columns are capable of moving further apart when a convex bend is applied to the at least a portion of the strut elements during use; and
a second coating.

2. The device according to claim 1 , wherein the first and/or second coating has a density of more than 10 g/cm 3 .

3. The device according to claim 1 , wherein the framework is formed from a superelastic material.

4. The device according to claim 1 , wherein the plurality of micro-columns are porous.

5. The device according to claim 1 , wherein the plurality of micro-columns are generally independent columns that extend substantially perpendicularly to a substrate of the at least a portion of the strut elements.

6. The device according to claim 1 , wherein the first ends of the plurality of micro-columns are adjacent a substrate of the at least a portion of the strut elements and spacing between the second end varies with deformation of the substrate.

7. The device according to claim 1 , wherein the second end defines an outer surface that is rough.

8. The device according to claim 1 , wherein the elastic modulus of the second coating is less than 50% of that of the first coating.

9. The device according to claim 1 , wherein the second coating is a hydrophilic material or a hydrogel.

10. The device according to claim 1 , wherein the first and/or second coating fills adjacent recesses of the at least a portion of the strut elements.

11. The device according to claim 10 , wherein a thickness of the first and/or second coating in the adjacent recesses of the at least a portion of the strut elements is greater than a thickness of coating material on other surfaces of the at least a portion of the strut elements.

12. The device according to claim 10 , wherein the adjacent recesses of the at least a portion of the strut elements comprise a series of grooves.

13. The device according to claim 1 , wherein the plurality of micro-columns are non-porous.

Assignees

• Neuravi Ltd

Inventors

• Vale David
• Brady Eamon
• Gilvarry Michael
• Hardiman David
• Casey Brendan

Classifications

• B05D3/12

  by mechanical means · CPC title

• A61B2017/00942

  hydrophilic · CPC title

• A61B2017/2217

  single wire changing shape to a gripping configuration · CPC title

• B05D1/322

  Removable films used as masks · CPC title

• A61B2017/00867

  shape memory effect · CPC title