Fork-Type Covered Stent

• US 20170128189A1
• Filed: 06/19/2015
• Published: 05/11/2017
• Est. Priority Date: 06/27/2014
• Status: Active Grant

• Current Assignee: Lifetech Scientific (Shenzhen) Co., Ltd.
• Original Assignee: Lifetech Scientific (Shenzhen) Co., Ltd.
• Inventors: WANG, Yongsheng, LIU, Caiping, ZHANG, Deyuan, GUO, Wei
• Granted Patent: US 10,188,501 B2
• Time in Patent Office: Days
• CPC Class Codes: A61F 2/06 Blood vessels
• CPC Class Codes: A61F 2/07 Stent-grafts
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/061 provided with means for allowing access to secondary lumens
• CPC Class Codes: A61F 2002/065 Y-shaped blood vessels
• CPC Class Codes: A61F 2002/075 the stent being loosely attached to the graft material, e.g. by stitching
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0037 differing in height or in length

Abstract

A bifurcated stem graft (10) comprises a body (100) and a side branch (200) that forms an acute angle with the body (100). The side branch (200) comprises a covering film (220) and a first bare stent (240) only disposed on the covering film (220). Part of the first bare stent (240) is positioned adjacent a boundary line (230) of the body (100) and the covering film (220) and is located in a vertex angle area (250) of the acute angle. Due to the fact that part of the first bare stem (240) is attached to the vertex angle area (250), after the stem (10) is released, the self-expanded part of the first bare stent (240) enables the vertex angle area (250) of the side branch (200) to be effectively supported, the covering film is not prone to shrinkage, and a leading wire can enter easily. Meanwhile, a special bare stent attached to the vertex angle area (250) does not need to be additionally disposed on the first bare stent (240), and thus the technology for preparing the bare stem is simplified; furthermore, the first bare stent (240) is only disposed on the side branch (200) and does not need to span the connecting part of the body (100) and the side branch (200), and thus the waveform can be shaped easily.

Claims

1. A bifurcated stent graft, characterized in comprising a body and a side branch that forms an acute angle with the body;

the side branch comprising a covering film and a first bare stent disposed only on the covering film;

a part of the first bare stent is positioned adjacent a boundary line of the body and the covering film, and is located in a vertex angle area of the acute angle.

2. The bifurcated stent graft of claim 1, characterized in that the first bare stent comprises a plurality of proximal vertices and distal vertices;

the connection line of the plurality of distal vertices is annular; and

at least a part of the plurality of proximal vertices is located in the vertex angle area,

3. The bifurcated stent graft of claim 1, characterized in that the first bare stent comprises a plurality of proximal vertices and distal vertices;

the connection line of the plurality of distal vertices is located along the same circumference;

at least a part of the plurality of proximal vertices is located in the vertex angle area.

4. The bifurcated stent graft of claim 3, characterized in that the plurality of distal vertices are aligned with the distal end of the covering film.

5. The bifurcated stent graft according to claim 1, characterized in that the body comprises a second bare stent positioned adjacent the boundary line;

the second bare stent comprises two end support bars disposed at the opposite sides of the side branch; and

the two end support bars are parallel to each other or symmetrical relative to the side branch,

6. The bifurcated stent graft of claim 5, characterized in that the tails of the end support bars are smoothly rounded.

7. The bifurcated stent graft according to claim 1, characterized in that the first bare stent is structured as a waveform open loop;

the side branch also comprises a third bare stent disposed on the covering film;

the third bare stent is structured as a waveform close loop and connected with the first bare stent.

8. The bifurcated stent graft according to claim 7, characterized in that the body comprises a second bare stent positioned adjacent the boundary line;

the second bare stent comprises two end support bars disposed at the opposite sides of the side branch;

the two end support bars are parallel to one another or symmetrical relative to the side branch.

9. The bifurcated stent graft of claim 8, characterized in that the tails of the end support bars are smoothly rounded.