Aortic bare stent and aortic dissection stent

• US 10,799,375 B2
• Filed: 03/16/2017
• Issued: 10/13/2020
• Est. Priority Date: 03/18/2016
• Status: Active Grant

• Current Assignee: Hangzhou Endonom Medtech Co., Ltd.
• Original Assignee: Hangzhou Weiqiang Medical Technology Co., Ltd.
• Inventors: Wang, Yongsheng, Fu, Weiguo, Li, Jianmin, Zhang, Tingchao
• Primary Examiner(s): Prebilic, Paul B
• Application Number:
  US16/084,264
• Publication Number:
  US 20190070027A1
• Time in Patent Office: 1,307 Days
• Field of Search: 623 122
• 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 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/92 Stents in the form of a rolled-up sheet expanding after insertion into the vessel , e.g. with a spiral shape in cross-section
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2002/9511 the retaining means being filaments or wires
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol
• 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 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61F 2250/0029 differing in bending or flexure capacity
• CPC Class Codes: A61F 2310/00023 Titanium or titanium-based alloys, e.g. Ti-Ni alloys

Abstract

An aortic bare stent and an aortic dissection stent are disclosed. The aortic bare stent is in a tubular net structure, with multiple support stents in circles and arranged along an axial direction. Two adjacent support stents are connected by a connector stent. The connector stent is made of a hyper-elastic material. A flexural rigidity of the connector stent is less than that of the support stent. The support stent is made of a single-strand hyper-elastic nickel titanium wire or formed by cutting a nickel titanium tubing. The connector stent is made of a multi-strand composite wire. The multi-strand composite wire is formed by twisting or weaving multiple strands of filaments, and each strand of filament is independently of a nickel titanium material.

Claims

1. An aortic bare stent, in a tubular net structure, comprising:

a plurality of support stents, wherein the plurality of support stents are arranged along an axial direction, each of the plurality of support stents independently forms a ring, and each of the plurality of support stents is made of a single-strand nickel titanium wire; and

a plurality of connector stents, wherein each of the plurality of connector stents is operable to connect two adjacent support stents among the plurality of support stents, each of the plurality of connector stents is made of multi-strand nickel titanium filaments, a diameter of each of the plurality of connector stents is the same as that of each of the plurality of support stents, and a flexural rigidity of each of the plurality of connector stents is less than that of each of the plurality of support stents.

2. The aortic bare stent of claim 1, wherein the multi-strand nickel titanium filaments are twisted or weaved to form a multi-strand composite wire for constructing each connector stent, and the single-strand nickel titanium wire has a larger diameter than each nickel titanium filament for constructing each connector stent.

3. The aortic bare stent of claim 1, wherein a ratio of the flexural rigidity of each of the plurality of connector stents to the flexural rigidity of each of the plurality of support stents falls within a range of 0.5:

100˜

20;

100.

4. The aortic bare stent of claim 1, wherein each of the plurality of support stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, and peaks of each two support stents connected to a same connector stent are aligned.

5. The aortic bare stent of claim 4, wherein with adjacent peaks and valleys of each two support stents connected to a same connector stent as connection points, each connector stent is connected to corresponding connection points of two support stents connected to the connector stent.

6. The aortic bare stent of claim 5, wherein each of the plurality of connector stents independently forms a ring, and each of the plurality of connector stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, and is connected to each connection point at two sides of an extending path to form a closed lattice structure.

7. The aortic bare stent of claim 5, wherein each of the plurality of connector stents independently forms a ring, and each of the plurality of connector stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, part of peaks and part of valleys at two sides of an extending path of each of the plurality of connector stents act as connection points to be connected to each of the plurality of connector stents to form an open-loop lattice structure.

8. The aortic bare stent of claim 5, wherein each of the plurality of connector stents is connected to corresponding connection points in a winding manner.

9. The aortic bare stent of claim 2, wherein each nickel titanium filament has a diameter falling within a range of 0.05˜

0.2 mm.

10. The aortic bare stent of claim 1, wherein a ratio of an axial length of each of the plurality of connector stents to an axial length of each of the plurality of support stents falls within a range of 1:

1˜

1;

2.5.

11. The aortic bare stent of claim 1, further comprising at least one axial connector, each of the at least one axial connector being connected to corresponding connection points of each of the plurality of support stents in a knotting or winding manner.

12. The aortic bare stent of claim 11, wherein each of the at least one axial connector is connected to all or part of the plurality of support stents contacting the axial connector.

13. The aortic bare stent of claim 11, wherein multiple axial connectors are distributed uniformly along a circumferential direction of the aortic bare stent.

20. The aortic bare stent of claim 5, wherein each of the plurality of connector stents is connected to corresponding connection points in a knotting manner.

14. An aortic dissection stent, comprising:

a covered stent; and

an aortic bare stent in a tubular net structure and butted with the covered stent, comprising;

a plurality of support stents, wherein the plurality of support stents are arranged along an axial direction, each of the plurality of support stents independently forms a ring, and each of the plurality of support stents is made of a single-strand nickel titanium wire; and

a plurality of connector stents, wherein each of the plurality of connector stents is operable to connect two adjacent support stents among the plurality of support stents, each of the plurality of connector stents is made of multi-strand nickel titanium filaments, a diameter of each of the plurality of connector stents is the same as that of each of the plurality of support stents, and a flexural rigidity of each of the plurality of connector stents is less than that of each of the plurality of support stents.

15. The aortic dissection stent of claim 14, wherein and each of the plurality of support stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, and peaks of each two support stents connected to a same connector stent are aligned.

16. The aortic dissection stent of claim 15, wherein with adjacent peaks and valleys of each two support stents connected to a same connector stent as connection points, each connector stent is connected to corresponding connection points of two support stents connected to the connector stent.

17. The aortic dissection stent of claim 16, wherein each of the plurality of connector stents independently forms a ring, and each of the plurality of connector stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, and is connected to each connection point at two sides of an extending path to form a closed lattice structure.

18. The aortic dissection stent of claim 16, wherein each of the plurality of connector stents independently forms a ring, and each of the plurality of connector stents fluctuates to be in a wave shape along the axial direction while extending circumferentially, part of peaks and part of valleys at two sides of an extending path of each of the plurality of connector stents act as connection points to be connected to each of the plurality of connector stents to form an open-loop lattice structure.

19. The aortic dissection stent of claim 14, further comprising at least one axial connector, each of the at least one axial connector being connected to corresponding connection points of each of the plurality of support stents in a knotting or winding manner.