Stent anchoring system

Patent metadata

Field	Value
Publication number	US-11351045-B2
Application number	US-202016803470-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Nov 9, 2016
Publication date	Jun 7, 2022
Grant date	Jun 7, 2022

Abstract

An illustrative stent may comprise an elongated tubular member having a first end and a second end and an intermediate region disposed therebetween. The elongated tubular member may include at least one barb attached thereto. The barb may be configured to be tucked under a filament of the stent during delivery of the stent and protrude radially from the stent, when the stent is deployed.

First claim

What is claimed is:

1. A stent, the stent comprising:
an elongated tubular member comprising at least one filament interwoven to form a plurality of cells, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration; and
at least one barb fixed to the at least one filament, the at least one barb having a first end, a second end, and a length extending therebetween, the at least one barb fixed to the at least one filament at least along a portion of the length of the at least one barb, wherein at least the first end is free of attachment to the elongated tubular member in the expanded configuration;
wherein the free first end of the at least one barb is configured to be positioned radially inward of and under an adjacent winding of the at least one filament when the elongated tubular member is in the collapsed configuration and to extend radially away from the elongated tubular member when the elongated tubular member is in the expanded configuration.

2. The stent of claim 1 , wherein in the collapsed configuration the plurality of cells have a first profile and in the expanded configuration the plurality of cells have a second profile different from the first profile, wherein the first profile of the plurality of cells has a major dimension extending along a longitudinal axis of the elongated tubular member.

3. The stent of claim 2 , wherein the second profile of the plurality of cells has a major dimension extending along a circumference of the elongated tubular member.

4. The stent of claim 1 , wherein the at least one barb comprises a wire.

5. The stent of claim 1 , wherein the second end of the at least one barb is attached to the at least one filament.

6. The stent of claim 5 , wherein the portion of the length of the at least one barb fixed to the at least one filament is equivalent to a length between two adjacent cross-points defining one of the plurality of cells.

7. The stent of claim 6 , wherein the elongated tubular member has an inner surface and an outer surface, the inner surface defined by an inner surface of the at least one filament, wherein the second end and portion of the length of the at least one barb are fixed to the inner surface of the at least one filament.

8. The stent of claim 1 , wherein each barb has a width transverse to the length, wherein the adjacent winding extends over an entirety of the width of the barb when the elongated tubular member is in the collapsed configuration.

9. The stent of claim 1 , wherein the at least one barb comprises a wire helically wound around the at least one filament.

10. The stent of claim 9 , wherein a middle portion of the wire forming each barb is helically wound around the at least one filament, and both first and second ends of the at least one barb are free and biased to extend radially outward from the elongated tubular member when unconstrained.

11. The stent of claim 10 , wherein when the elongated tubular member is in the collapsed configuration, the free first end is disposed radially inward of a second filament and the second free end is disposed radially inward of a third filament.

12. The stent of claim 1 , wherein the at least one barb comprises a material combination which behaves like a temperature sensitive bimetallic strip.

13. The stent of claim 1 , wherein the at least one barb comprises a plurality of barbs spaced along a length and a circumference of the elongated tubular member.

14. The stent of claim 1 , wherein the at least one barb comprises a plurality of barbs, wherein at least some of the plurality of barbs have a first length and at least some of the plurality of barbs have a second length different from the first length.

15. A stent, the stent comprising:
an elongated tubular member comprising at least one filament interwoven to form a plurality of cells, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration; and
a plurality of barbs fixed to the at least one filament and comprising a shape memory wire, the plurality of barbs each having a first end, a second end, and a length extending therebetween, each barb fixed to the at least one filament at least along a portion of the length of the barb, at least the first end of each barb is free and biased to extend radially outward from the elongated tubular member when unconstrained;
wherein in the collapsed configuration the at least one filament applies a radially inward constraining force to the free first end of each barb such that the free first end is constrained radially inward of the at least one filament and as the elongated tubular member moves from the collapsed configuration to the expanded configuration the free first end of at least some of the plurality of barbs is unconstrained by the at least one filament and extends radially outward from the elongated tubular member.

16. The stent of claim 15 , wherein each cell is defined by junctions of the at least one filament, and wherein at least some of the plurality of barbs are fixed to the at least one filament between and spaced away from adjacent junctions.

17. The stent of claim 15 , wherein the second end of at least some of the plurality of barbs is attached to the at least one filament.

18. The stent of claim 15 , wherein at least some of the plurality of barbs comprises a wire helically wound around the at least one filament, wherein a middle portion of the wire is helically wound around the at least one filament, and both first and second ends are free and biased to extend radially outward from the elongated tubular member when unconstrained.

19. A stent, the stent comprising:
an elongated tubular member comprising at least one filament interwoven to form a plurality of cells defined by junctions of the at least one filament, the elongated tubular member configured to move between a collapsed configuration and an expanded configuration; and
at least one barb fixed to the at least one filament, the at least one barb having a first end, a second end, and a length extending therebetween, the at least one barb fixed to the at least one filament at least along a portion of the length of the at least one barb, wherein at least the first end of the at least one barb is free of attachment to the elongated tubular member in the expanded configuration, wherein at least one of the at least one barb is fixed to the at least one filament between and spaced away from adjacent junctions;
wherein when in the collapsed configuration, the at least one filament is configured to exert a constraining force on the free first end to position the at least one barb radially inward of the at least one filament and when in the expanded configuration, the free first end of the at least one barb extends radially outward from the elongated tubular member.

20. The stent of claim 19 , wherein the at least one barb comprises a shape memory material.

Assignees

• Boston Scient Scimed Inc

Inventors

• Folan Martyn G
• Hynes Martin
• Nolan Damien V
• Connaughton Enda
• MONTAGUE Matthew
• Keating Thomas M
• Walsh Michael

Classifications

• A61F2/848 Primary

  having means for fixation to the vessel wall, e.g. barbs · CPC title

• A61F2002/8483

  Barbs · CPC title

• A61F2/90

  characterised by a net-like or mesh-like structure · CPC title

• A61F2230/0069

  cylindrical · CPC title

• A61F2/04

  Hollow or tubular parts of organs, e.g. bladders, tracheae, bronchi or bile ducts (A61F2/18, A61F2/20 take precedence; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95) · CPC title