Stent device having reduced foreshortening and recoil and method of making same

Patent metadata

Field	Value
Publication number	US-11865018-B2
Application number	US-202017088518-A
Country	US
Kind code	B2
Filing date	Nov 3, 2020
Priority date	Mar 15, 2013
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A stent device includes generally cylindrical rings aligned along a longitudinal axis, and interconnected by interconnecting members. Each interconnecting member includes a first coupling end, a second coupling end, and an elongate portion therebetween. The first coupling end, the elongate portion, and the second coupling end combine in either a first orientation or a second orientation, which are substantially mirror images. For each interconnecting member, the first coupling end can intersect with a midpoint of a transition region of a substantially repeating curved segment on one of the rings, and the second coupling end can intersect with a midpoint of a curved segment of a different and immediately adjacent ring. The interconnecting members can be arranged in rows extending longitudinally along the device. Along each row, consecutive interconnected members alternate between the first orientation and the second orientation. A cover may be provided over the stent device.

First claim

What is claimed is:

1. A method of manufacturing a stent device, the method comprising:
providing a plurality of generally cylindrical rings each formed by a plurality of substantially repeating bent segments, each of the plurality of bent segments comprising one substantial peak, one substantial valley, and a transition region leading between the one substantial peak and the one substantial valley, each bent segment having a midpoint on the transition region substantially midway between the one substantial peak and the one substantial valley, the plurality of rings being arranged in a series along a longitudinal axis in such a way that the one substantial peak and the one substantial valley of each bent segment of each ring in the series is substantially a mirror image of one substantial peak and one substantial valley of a corresponding curved segment in an immediately adjacent ring; and
providing a plurality of interconnecting members, each of the plurality of interconnecting members comprising:
a first coupling end;
a second coupling end opposite the first coupling end; and
an elongate portion extending between the first coupling end and the second coupling end, wherein the first coupling end, the elongate portion, and the second coupling end combine in a first orientation or a second orientation that is substantially a mirror image of the first orientation;
wherein the first coupling end intersects with the midpoint of the transition region of a bent segment of a ring of the plurality of rings and the second coupling end intersects with the midpoint of a bent segment of a different and immediately adjacent ring of the plurality of rings;
wherein each of the plurality of interconnecting members has a fusiform shape in which a width of each interconnecting member at the center of the elongate portion is the widest position of each interconnecting member, wherein each interconnecting member narrows along its length in both directions from the center of the elongate portion, and wherein the first coupling end forms a first end of the fusiform shape and the second coupling end forms a second end of the fusiform shape;

wherein the plurality of interconnecting members is arranged in rows extending longitudinally along the device; and
wherein along each of the rows the interconnecting members alternate with each consecutive occurrence between the first orientation and the second orientation.

2. The method of claim 1 , wherein the first coupling end and the second coupling end of each of the plurality of interconnecting members each comprise an elbow.

3. The method of claim 1 , wherein the number of interconnecting members between any two adjacent rings of the plurality of rings is equal to the number of substantially repeating bent segments in each ring of the plurality of rings.

4. The method of claim 1 , wherein the first coupling end and the second coupling end of each of the plurality of interconnecting members are azimuthally aligned.

5. The method of claim 1 , wherein the first coupling end and the second coupling end of each of the plurality of interconnecting members are circumferentially aligned.

6. A stent device, comprising:
a stent comprising a plurality of radially expandable rings arranged in a series along a common longitudinal axis and coupled by a plurality of interconnecting members, wherein each of the plurality of radially expandable rings comprises a plurality of repeating bent segments, each repeating bent segment comprising a peak and a valley, the peaks and valleys of adjacent expandable rings comprise an angular offset such that the peaks of a first expandable ring longitudinally align with the valleys of a second expandable ring adjacent to the first expandable ring, wherein each of the interconnecting members has an elongate portion, a first coupling end, and a second coupling end, each of the plurality of interconnecting members having a fusiform shape in which a width of each interconnecting member at the center of the elongate portion is the widest position of each interconnecting member, each interconnecting member narrowing along its length in both directions from the center of the elongate portion, the first coupling end forming a first end of the fusiform shape and the second coupling end forming a second end of the fusiform shape; and
a cover formed of expanded polytetrafluoroethylene and comprising an inner layer and an outer layer, wherein the cover encapsulates the stent to form a covered stent;
wherein, when expanded to an operational deployment diameter, the covered stent device exhibits foreshortening of about 6% or less.

7. The stent device of claim 6 , wherein a quantity of interconnecting members between adjacent expandable rings is equal to a quantity of valleys among each of the adjacent expandable rings.

8. The stent device of claim 6 , wherein the first coupling end, the elongate portion, and the second coupling end combine in a first orientation or a second orientation, wherein the second orientation is substantially a mirror image of the first orientation.

9. The stent device of claim 8 , wherein the interconnecting members of a first set of two adjacent expandable rings are of the first orientation, and wherein the interconnecting members of a second set of two adjacent expandable rings are of the second orientation; only one of the expandable rings of the second set of two adjacent expandable rings is shared with the first set of two adjacent expandable rings.

10. The stent device of claim 9 , wherein interconnecting members are arranged in series along a length of the stent and form a sinusoidal shape having an inflexion point at or in proximity to a location in which interconnecting members connect to the expandable rings.

11. The stent device of claim 6 , wherein the covered stent device exhibits foreshortening of about 3% or less when expanded to an operational deployment diameter.

12. The stent device of claim 6 , wherein the covered stent device exhibits foreshortening of about 2% or less when expanded to an operational deployment diameter.

13. The stent device of claim 6 , wherein the covered stent device exhibits foreshortening of about 1% or less when expanded to an operational deployment diameter.

14. The stent device of claim 6 , wherein the covered stent device exhibits foreshortening of about 0% or less when expanded to an operational deployment diameter.

15. The stent device of claim 6 , wherein the operational deployment diameter is between about 4 mm to about 8 mm.

16. The stent device of claim 6 , wherein the operational deployment diameter is between about 5 mm to about 7 mm.

17. The stent device of claim 6 , wherein each of the plurality of bent segments comprises one peak and one valley.

18. The stent device of claim 6 , wherein within the plurality of bent segments, the peak and the valley of the plurality of bent segments are the only peaks and valleys within the plurality of bent segments.

Assignees

• Atrium Medical Corp

Inventors

• Lane John
• Heim David
• Schick Christine
• Letzelter Jennifer
• Hamelin Susan

Classifications

• A61F2/89 Primary

  the wire-like elements comprising two or more adjacent rings flexibly connected by separate members · CPC title

• A61F2/07

  Stent-grafts · CPC title

• A61F2/915

  with bands having a meander structure, adjacent bands being connected to each other · CPC title

• A61F2002/072

  Encapsulated stents, e.g. wire or whole stent embedded in lining · CPC title

• A61F2002/91541

  Adjacent bands are arranged out of phase · CPC title