Intraluminal Stent and Preparation Method Therefor

Patent metadata

Field	Value
Publication number	US-2022031481-A1
Application number	US-202117503700-A
Country	US
Kind code	A1
Filing date	Oct 18, 2021
Priority date	May 28, 2019
Publication date	Feb 3, 2022
Grant date	—

Abstract

An intraluminal stent (1) and a preparation method therefor are provided. The intraluminal stent (1) includes at least one sub-stent. The sub-stent includes at least a first wire (4) extending along a first spiral direction and at least a second wire (5) extending along a second spiral direction, and the first wire (4) and the second wire (5) extend in different directions to form several wire intersection points. The intraluminal stent (1) has several wrapped portions (2) to wrap two corresponding wire tail ends. A wrapping connector (3) is disposed at a periphery of the wrapped portion (2). Two end portions of the wrapping connector (3) are firmly connected to regions corresponding to two ends of the wrapped portion (2). The two wire tail ends of the wrapped portions (2) are wrapped by using the wrapping connector (3). The stent (1) is less harmful to intraluminal tissues and a relatively strong tensile resistance.

First claim

What is claimed is:

1 . An intraluminal stent, wherein the intraluminal stent comprises at least one sub-stent; the sub-stent has a radial compression form and a radial expansion form; the sub-stent has, in an axial direction, end portion regions at two ends and an intermediate region extending between the end portion regions; the sub-stent comprises at least a first wire extending along a first spiral direction and at least a second wire extending along a second spiral direction; and the first wire and the second wire extend in different directions to form several wire intersection points;
wherein the intraluminal stent has several wrapped portions for wrapping two corresponding wire tail ends; a wrapping connector is disposed at a periphery of the wrapped portion; two end portions of the wrapping connector are firmly connected to regions corresponding to two ends of the wrapped portion; and the wrapped portion is disposed at a distance from an edge of at least one end portion of the sub-stent.

2 . The intraluminal stent according to claim 1 , wherein a separation distance between the wrapped portion and the edge of at least one end portion of the sub-stent is a, and a length of the sub-stent along the axial direction is L, wherein a/L is greater than 1/20.

3 . The intraluminal stent according to claim 1 , wherein the two wire tail ends of the wrapped portions are wrapped by the wrapping connector in a manner of being close to or in contact with each other.

4 . The intraluminal stent according to claim 3 , wherein the two wire tail ends of the wrapped portions are wrapped by using the wrapping connector in a manner that the two tail ends can move relative to each other.

5 . The intraluminal stent according to claim 1 , wherein radial compression resistance force of a corresponding portion of the wrapping connector is not smaller than 10 N.

6 . The intraluminal stent according to claim 1 , wherein the wrapping connector is an elastic coating layer and/or a heat-shrinkable tube.

7 . The intraluminal stent according to claim 1 , wherein a length of the wrapping connector at least completely covers the wrapped portion, and the two corresponding wire tail ends in the wrapped portion are in contact with each other in an abutting manner or have an overlapping region.

8 . The intraluminal stent according to claim 1 , wherein at least one end portion region of the stent contracts radially when closing to the intermediate region, the wrapped portion is located at a radial contraction portion, and the wrapping connector is located at a radial contraction region.

9 . The intraluminal stent according to claim 1 , wherein a cross section of the sub-stent is circular, D-shaped, or elliptical.

10 . The intraluminal stent according to claim 1 , wherein the intraluminal stent is an L-shaped or a Y-shaped stent.

11 . The intraluminal stent according to claim 1 , wherein the tail end of the first wire extending along the first spiral direction is bent towards the intermediate region at the end portion region on at least one end of the sub-stent to form a bent portion, and is close to the corresponding tail end of the second wire extending along the second spiral direction to form a wrapped portion.

12 . The intraluminal stent according to claim 1 , wherein between two sub-stents, a wire tail end of one sub-stent extends towards a corresponding wire tail end of another sub-stent to form a wrapped portion.

13 . The intraluminal stent according to claim 1 , wherein a length of the wrapping connector is twice of a width of a braided mesh; in another spiral direction, there is a first wire or a second wire that crosses the wrapping connector; the braided mesh is a grid formed by means that the first wire intersects with the second wire; and said another spiral direction is a first spiral direction or a second spiral direction that is not provided with a wrapping connector.

14 . The intraluminal stent according to claim 13 , wherein both ends of the wrapping connector are located at the wire intersection points of the first wire and the second wire, and are clamped with the first wire or the second wire that is in said another spiral direction and forms the wire intersection points.

15 . The intraluminal stent according to claim 13 , wherein in the wrapping connector, a length for which the two wire tail ends overlap with each other is twice of the width of the braided mesh.

16 . The intraluminal stent according to claim 1 , wherein the wrapping connector is located in a transition region between the end portion region and the intermediate region of the sub-stent.

17 . The intraluminal stent according to claim 1 , wherein the wrapping connector is a heat-shrinkable tube, and a heat shrinkage ratio of the heat-shrinkable tube is greater than or equal to 30%.

18 . A method for preparing the intraluminal stent according to claim 1 , comprising the following steps:
(1) providing an intraluminal stent that comprises at least one sub-stent; (2) making two corresponding wire tail ends in the sub-stent close to each other to form a wrapped portion, wherein several wrapped portions are formed on the sub-stent; and (3) disposing a wrapping connector at a periphery of the wrapped portion, enabling two end portions of the wrapping connector to be firmly connected to regions corresponding to two ends of the wrapped portion, wrapping two wire tail ends of the wrapped portions by using the wrapping connector, and enabling the wrapped portion to be disposed at a distance from an edge of at least one end portion of the sub-stent.

19 . The method for preparing the intraluminal stent according to claim 18 , wherein in step (3), the two wire tail ends penetrate into a wire mesh formed by a first wire extending along a first spiral direction and at least a second wire extending along a second spiral direction to form the wrapped portion.

20 . The method for preparing the intraluminal stent according to claim 18 , wherein in step (2), the two end portions of the wrapping connector are fixed at the regions corresponding to the two ends of the wrapped portion through a coating process or a heat shrinking process to form firm connections.

Assignees

• Micro Tech Nanjing Co Ltd

Inventors

• Leng Derong
• Li Yuqian
• Xu Nianci
• Zhao Yongxue
• Pan Changwang
• Li Ning
• Liu Chunjun
• Tang Zhi
• Jin Hongyan
• Zhang Chen

Classifications

• A61F2/852 Primary

  Two or more distinct overlapping stents · CPC title

• A61F2230/0008

  elliptical or oval · CPC title

• A61F2220/0033

  made by longitudinally pushing a protrusion into a complementary-shaped recess, e.g. held by friction fit · CPC title

• A61F2230/0034

  D-shaped · CPC title

• A61F2002/067

  modular · CPC title