# US 9,039,754 B2 · Stent

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- Number: US 9,039,754 B2
- Document ID: US9039754B2
- Status: Granted
- Kind: B2
- Application number: 13/438,391
- Filed: 2012-04-03
- Published: 2012-10-18
- Granted: 2015-05-26
- Earliest claimed: 2011-04-14
- Assignees: Asahi Intecc Co., Ltd.
- Applicants: Makoto Nishigishi
- Inventors: Makoto Nishigishi
- Web page: https://patentgrep.com/patent/US9039754B2

## CPC

- A61F 2/90: characterised by a net-like or mesh-like structure
- D04C 1/06: Braid or lace serving particular purposes
- A61F 2002/068: {Modifying the blood flow model, e.g. by diffuser or deflector}
- A61F 2250/0017: differing in yarn density
- A61F 2250/0036: differing in thickness
- A61F 2250/0039: differing in diameter
- D10B 2509/06: Vascular grafts; stents
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- D04C: BRAIDING OR MANUFACTURE OF LACE, INCLUDING BOBBIN-NET OR CARBONISED LACE; BRAIDING MACHINES; BRAID; LACE (machines for making soles from strips of material A43D29/00; cane working B27J1/00)
- D10B: INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES

## Abstract

A stent, having a central axis that extends in a longitudinal direction of the stent, includes a first strand group and a second strand group. The first strand group and the second strand group are woven together. The first strand group is wound in a right-handed spiral around the central axis and the second strand group is wound in a left-handed spiral around the central axis. A maximum diameter of first strands constituting the first strand group is different from a maximum diameter of second strands constituting the second strand group.

## Claims

### Claim 1

A stent having a central axis that extends in a longitudinal direction of the stent, the stent comprising:
a first strand group having a plurality of first strands;
a second strand group having a plurality of second strands, the first strand group and the second strand group being woven together;
a dense part formed at both ends of the stent; and
a sparse part formed at a central part of the stent, wherein
the first strand group is wound in a right-handed spiral around the central axis,
the second strand group is wound in a left-handed spiral around the central axis,
a maximum diameter of each of the plurality of first strands constituting the first strand group is less than a maximum diameter of each of the plurality of second strands constituting the second strand group,
in the sparse part, a number of the first strands is less than a number of the second strands, and
at least one distalmost end of at least one of the plurality of first strands is disposed between one of the dense parts and the sparse part.

### Claim 2 (depends on 1)

The stent according to claim 1, wherein
a difference between the number of the first strands and the number of the second strands in the sparse part is between 2 and 12.