Twisted stent

• US 9,265,636 B2
• Filed: 05/25/2007
• Issued: 02/23/2016
• Est. Priority Date: 05/25/2007
• Status: Active Grant

• Current Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Original Assignee: C.R. Bard, Inc. (Becton, Dickinson & Co)
• Inventors: Chanduszko, Andrzej J.
• Primary Examiner(s): Rodjom, Katherine
• Application Number:
  US11/753,909
• Publication Number:
  US 20080294267A1
• Time in Patent Office: 3,196 Days
• Field of Search: 623/1.15, 623/1.11, 623/1.22
• US Class Current: 1/1
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/9517 handle assemblies therefor
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• CPC Class Codes: A61F 2002/91558 connected peak to peak

Abstract

A stent is disclosed and can include a stent body having a longitudinal axis. The stent body can also have a network of struts that can define a plurality of cells defined between interconnected struts. Each of the plurality of cells includes a major axis that is angled with respect to the longitudinal axis to form a cell angle, β.

Claims

1. A stent, comprising:

a stent body having a network of struts arranged along a longitudinal axis, a plurality of cells defined between all of the interconnected struts of the network of struts, each of the plurality of cells of the stent body defining convex cells including a cell major axis through spaced apart first and second strut intersection points, each cell major axis is parallel to all other cell major axes and each cell major axis lies in a mirror plane of the cell that symmetrically bisects the cell forming a non-zero cell angle, β

, with respect to the longitudinal axis in the same direction, each of the plurality of cells including at least one strut oriented parallel to the cell major axis.

2. The stent of claim 1, wherein β

is less than ninety degrees (0°

<

β

<

90°

).

3. The stent of claim 2, wherein β

is greater than one degree and less than sixty degrees (1°

<

β

<

60°

).

4. The stent of claim 3, wherein β

is greater than two degrees and less than forty-five degrees (2°

<

β

<

45°

).

5. The stent of claim 4, wherein β

is greater than five degrees and less than thirty degrees (5°

<

β

<

30°

).

6. The stent of claim 1, wherein the stent body defines a distal end and proximal end, wherein the stent body includes an outer diameter, and wherein the stent is configured so the outer diameter decreases as the distal end and the proximal end are rotated with respect to each other about the longitudinal axis.

7. The stent of claim 1, wherein the stent comprises a shape memory material.

8. The stent of claim 7, wherein the shape memory material comprises a shape memory polymer.

9. The stent of claim 7, wherein the shape memory material comprises a shape memory metal.

10. The stent of claim 9, wherein the shape memory metal comprises a nickel titanium alloy.

11. The stent of claim 1, wherein each of the plurality of cells includes a first strut positioned on a first cell side and a second strut positioned on a second cell side opposite of the first cell side, wherein each of the first and second struts is oriented parallel to the cell major axis.

12. The stent of claim 1, wherein the interconnected struts of the network of struts have a constant width.

13. The stent of claim 1, wherein each of the plurality of cells of the stent body further includes a cell minor axis perpendicular to the cell major axis, the length of the cell along the minor axis providing a minor cell length and the length of the cell along the major axis providing a major cell length greater than the minor cell length.

14. The stent of claim 13, wherein the aspect ratio defined by the ratio of the minor length to the major length is approximately 0.75.

15. The stent of claim 13, wherein the aspect ratio defined by the ratio of the minor length to the major length is approximately 0.50.

16. The stent of claim 13, wherein the aspect ratio defined by the ratio of the minor length to the major length is approximately 0.25.

17. The stent of claim 1, wherein the stent is an open-cell stent.

18. The stent of claim 1, wherein the stent comprises a non-shape memory material.

19. The stent of claim 18, wherein the non-shape memory material comprises any one or any combination of stainless steel, titanium, or a cobalt-chrome alloy.

20. The stent of claim 1, wherein two or more cells are fused together.

21. The stent of claim 1, wherein adjacent convex cells aligned perpendicular to the cell major axis share a common strut oriented parallel to the cell major axis, and adjacent convex cells not aligned perpendicular to the cell major axis share a common strut not parallel to the cell major axis.

22. A self-expanding stent, comprising:

a self-expanding stent body structured to substantially uniformly collapse radially about a longitudinal axis from an expanded configuration to a delivery configuration upon rotation of a proximal end of the stent body with respect to a distal end of the stent body, wherein the stent body includes a plurality of cells defined between interconnected struts of a network of struts arranged along the longitudinal axis, each of the plurality of cells from the proximal end to the distal end of the stent body define convex cells including a major axis that is parallel to all other cell major axes and that lies in a mirror plane of the cell that symmetrically bisects the cell and angled with respect to the longitudinal axis in the same direction to form a non-zero cell angle, β

, each of the plurality of cells including at least one strut oriented parallel to the cell major axis.

23. The stent of claim 22, wherein the stent collapses substantially uniformly.

24. The stent of claim 23, wherein each cell is generally hexagonal.

25. The stent of claim 24, wherein the plurality of cells form a helix around the stent body.

26. The stent of claim 24, wherein two or more cells are fused together.