Side branch stent graft construction

• US 20070219621A1
• Filed: 02/13/2007
• Published: 09/20/2007
• Est. Priority Date: 02/13/2006
• Status: Active Grant

• Current Assignee: Cook Medical Incorporated (Cook Group Incorporated)
• Original Assignee: Cook Incorporated (Cook Group Incorporated), William A. Cook Australia Pty. Ltd (Cook Group Incorporated)
• Inventors: Morriss, Susan, Hartley, David, Ducke, Werner, Chuter, Timothy
• Granted Patent: US 7,914,572 B2
• Time in Patent Office: Days
• US Class Current: 623/1.130
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2/89 the wire-like elements comprising two or more adjacent rings flexibly connected by separate members
• CPC Class Codes: A61F 2/954 for placing stents or stent-grafts in a bifurcation
• CPC Class Codes: A61F 2002/061 provided with means for allowing access to secondary lumens
• CPC Class Codes: A61F 2002/067 modular
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/30327 differing in diameter
• CPC Class Codes: A61F 2002/30461 sutured, ligatured or stitched
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2220/0075 sutured, ligatured or stitched, retained or tied with a rope, string, thread, wire or cable
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent graft (10) has a tubular body (12) of a biocompatible material and at least one fenestration (18, 20). The or each fenestration has a tubular side branch stitched into it with a portion of the tubular side branch extending within the tubular body and a portion of the tubular side branch extending exteriorly of the tubular body. The stitching by which the tubular side branch is mounted into the fenestration extends circumferentially and diagonally from one end of the tubular side branch to the other such that the tubular side branch extends from the tubular body at an angle thereto. The tubular side branch has a resilient ring around at least one and preferably both ends thereof and a self expanding stent in between them. The tubular side branch can have a circumferential linear portion (46) at an inner end to engage against the inner wall (58) of the tubular body. The tubular side branch can have a stent made from a single wire forming a first ring (45), a second ring (47), the second ring defining a plane which is substantially parallel to and spaced axially apart from the plane of the first ring and a number of helical wire portions (49) extending between the first and second ring. Preferably the wire is a shape memory wire such as Nitinol™wire.

Claims

1. A stent graft comprising a tubular body of a biocompatible material, at least one fenestration in the tubular body and a tubular side branch sealingly received in the at least one fenestration such a that an inner portion of the tubular side branch extends within the tubular body and an outer portion of the tubular side branch extends exteriorly of the tubular body.

2. A stent graft as in claim 1 wherein the inner portion of the tubular side branch extends toward the proximal end of the stent graft from the fenestration.

3. A stent graft as in claim 1 wherein the tubular body has a tapered portion and the fenestration is in the tapered portion.

4. A stent graft as in claim 1 wherein e tubular side branch is mounted into the fenestration by being stitching to the tubular body around the periphery of the fenestration.

5. A stent graft as in claim 4 wherein the stitching extends circumferentially and diagonally from one end of the tubular side branch to the other such that the tubular side branch extends from the tubular body at an angle thereto.

6. A stent graft as in claim 1 wherein the tubular side branch comprises a resilient ring around one or both ends thereof and the or each ring is formed from one to three turns of a shape memory wire and the ends of the wire terminate in loops and the or each ring is formed from stainless steel wire, plastics material or other suitable material.

7. A stent graft as in claim 1 comprising a stent formed from a resilient material on the tubular side branch.

8. A stent graft as in claim 7 wherein the stent is selected from a group comprising at least one helical strut, a longitudinal strut or a zig-zag stent.

9. A stent graft as in claim 1 wherein the tubular side branch comprises radiopaque markers on the outer portion of the tubular side branch.

10. A stent graft as in claim 1 wherein the tubular side branch extends beyond the fenestration externally of the tubular body.

11. A stent graft as in claim 6 wherein the ring at the inner end of the side branch comprises a linear portion and the linear portion is engaged against an inner wall of the tubular body.

12. A stent graft as in claim 1 wherein the tubular side branch comprises a reinforcement stent.

13. A stent graft as in claim 12 wherein the reinforcement stent comprises a portion of wire forming a first ring, a second ring, the second ring defining a plane which is substantially parallel to and spaced axially apart from the plane of the first ring and a plurality of helical wire portions extending between the first and second ring.

14. A stent graft as in claim 13 wherein the helical wire portions extend in both clockwise and anticlockwise directions between the rings at each end.

15. A stent graft comprising a tubular body of a biocompatible material, at least one fenestration in the tubular body and a tubular side branch sealingly received in the at least one fenestration such that an inner portion of the tubular side branch extends within the tubular body and an outer portion of the tubular side branch extends exteriorly of the tubular body, the inner portion of the tubular side branch comprising a circumferential end having a linear portion and the linear portion engaged against an inner wall of the tubular body.

16. A stent graft comprising a tubular body of a biocompatible material, at least one fenestration in the tubular body and a tubular side branch sealingly received in the fenestration such a that an inner portion of the tubular side branch extends within the tubular body and an outer portion of the tubular side branch extends exteriorly of the tubular body, the tubular side branch comprises a reinforcement stent and wherein the reinforcement stent comprises a portion of wire forming a first ring, a second ring, the second ring defining a plane which is substantially parallel to and spaced axially apart from the plane of the first ring and a plurality of helical wire portions extending between the first and second ring and wherein the inner portion comprises a circumferential end having a substantially linear portion and the linear portion being engaged against an inner wall of the tubular body.