Braided Self-Expanding Endoluminal Stent and Manufacturing Method Thereof

• US 20160213498A1
• Filed: 11/06/2013
• Published: 07/28/2016
• Est. Priority Date: 11/08/2012
• Status: Active Application

• Current Assignee: Lifetech Scientific (Shenzhen) Co., Ltd.
• Original Assignee: Lifetech Scientific (Shenzhen) Co., Ltd.
• Inventors: WANG, Yongsheng
• Granted Patent: US 10,251,763 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2240/001 Designing or manufacturing processes
• CPC Class Codes: A61F 2250/001 for adjusting a diameter
• CPC Class Codes: D04C 1/06 Braid or lace serving particular purposes
• CPC Class Codes: D04C 3/48 Auxiliary devices
• CPC Class Codes: D10B 2509/06 Vascular grafts; stents

Abstract

A braided self-expandable endoluminal stent comprises a tubular grid formed by connection of a plurality of wave bends in the circumferential direction. Each of the wave bands comprises a plurality of crests and troughs of an elastic wire in the axial direction, and is respectively connected with another wave band. On two sides of each of the wave bands, there is a wave band abutted thereto side by side. There is at least one cross-linking point between every two wave bands abutted side by side. Each of the cross-linking points is formed by intersecting one trough on one of the wave bands abutted side by side with one corresponding crest on the other wave band, and at least one part of the cross-linking points are fixed cross-linking points. Each of the wave bands is further staggered and overlapped with at least another wave band, and a plurality of crossing points (12, 14, 22, 23) are formed between the wave bands which are staggered and overlapped with each other. Each of the wave bands, together with at least another wave band, forms a group of parallel wave bands. As the wave bands in this group are similar in wave shape and in parallel to each other, no cross-linking points or crossing points (12, 14, 22, 23) will be formed between the parallel wave bands.

Claims

1. A braided self-expanding endoluminal stent, comprising a tubular grid formed by a plurality of axial wave bands connected along the circumferential direction, the tubular grid having a central axis, a proximal end and a distal end, each of the wave bands comprising a plurality of alternate crests and troughs wound by an elastic filament in the axial direction, the proximal end and the distal end of each of the wave bands being respectively connected to another wave band;

on either sides of each of the wave bands, there is a wave band abutted thereto side by side;

there is least one cross-linking point between every two of wave bands abutted side by side, each of the cross-linking points is formed by intersecting one trough on one of wave bands abutted side by side with one corresponding crest on the other wave band, and at least part of the cross-linking points are fixed cross-linking points, characterized in that each of the wave bands is further overlapped with at least another wave band, and a plurality of crossing points are formed between the wave bands which are overlapped with each other;

each of the wave bands, together with at least another wave band, forms a group of parallel wave bands; and

the parallel wave bands in the group are similar in wave shape and in parallel to each other so that there are neither cross-linking points nor crossing points formed between the parallel wave bands.

2. The braided self-expanding endoluminal stent according to claim 1, characterized in that the tubular grid comprises a plurality of crossing segments connected to each other in the axial direction, each of the crossing segments is tubular and comprises a plurality of crossing points distributed substantially uniformly, the cross-linking points are only located on a boundary of two adjacent crossing segments, and this boundary being a closed loop.

3. The braided self-expanding endoluminal stent according to claim 2, characterized in that there are nk−

1 cross-linking points or nk+1 cross-linking points on each of the boundaries, wherein, both n and k are natural numbers, n≧

3 and k≧

2.

4. The braided self-expanding endoluminal stent according to claim 2, characterized in that the number of crossing points on each of the crossing segments is substantially an integral multiple of that of cross-linking points on each of the boundaries, the difference between the ratio of the two numbers and the nearest integer being less than 0.2.

5. The braided self-expanding endoluminal stent according to claim 2, characterized in that the cross-linking points on the boundaries are all fixed cross-linking points.

6. The braided self-expanding endoluminal stent according to claim 2, characterized in that the length of each of the crossing segments is equal.

7. The braided self-expanding endoluminal stent according to claim 2, characterized in that the length of one of the crossing segments is an integral multiple of that of another crossing segment.

8. The braided self-expanding endoluminal stent according to claim 1, characterized in that the diameter of the tubular grid varies in the axial direction.

9. The braided self-expanding endoluminal stent according to claim 1, characterized in that the tubular grid comprises at least two segments different in diameter, which are connected to each other in the axial direction, each of the segments of the tubular grid comprises a plurality of wave bands, and there are cross-linking points formed between the wave bands of one of the segments of the tubular grid and the wave bands of another segment of the tubular grid.

10. A method for manufacturing a braided self-expanding endoluminal stent, the endoluminal stent comprising a tubular grid having a central axis, a proximal end and a distal end, the manufacturing method comprising the following steps:

step 1;

braiding a first group of grids for the tubular grid, the first group of grids being formed by a plurality of axial wave bands connected, wherein each of the wave bands comprising a plurality of alternate crests and troughs wound by an elastic filament in the axial direction, and the proximal end and the distal end of each of the wave bands are respectively connected to another wave band;

step 2;

braiding a second group of grids on the first group of grids in a staggered manner, the structure and shape of the second group of grids being similar to those of the first group of grids, the second group of grids being staggered by an angle in the circumferential direction with respect to the first group of grids to form a plurality of crossing points, the elastic filament for the first group of grids being connected to the elastic filament for the second group of grids; and

step 3;

braiding the rest part of the tubular grid;

lengthening the elastic filament for the second group of grids and connecting it to the first group of grids, and braiding the rest part of the tubular grid with the lengthened elastic filament.

11. The manufacturing method according to claim 10, characterized in that, in step 3, the rest part comprises a third group of grids;

the elastic filament for the second group of grids is lengthened and then connected to the first group of grids via the third group of grids, and the third group of grids are braided on the first group of grids and the second group of grids in a staggered manner with the lengthened elastic filament; and

the first group of grids, the second group of grids and the third group of grids are staggered in turn along the circumferential direction and overlapped to form a plurality of crossing points.

12. The manufacturing method according to claim 10, characterized in that, in step 1, cross-linking points are formed between the wave bands of the first group of grids to manufacture the first group of grids into a tubular shape.

13. The manufacturing method according to claim 10, characterized in that, in step 1, crossing points are formed between the wave bands of the first group of grids, and a plurality of cross-linking points and a plurality of crossing points are formed between the second group of grids and the first group of grids.

14. A self-expanding endoluminal stent manufactured according to the manufacturing method set forth in claim 10.