Flexible metal wire stent

• US 6,723,118 B1
• Filed: 06/06/2000
• Issued: 04/20/2004
• Est. Priority Date: 10/01/1997
• Status: Expired due to Term

• Current Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: DiMatteo, Kristian J., Roberts, George T., Ravenscroft, Adrian C., Ballou, Kurt
• Primary Examiner(s): Snow, Bruce
• Application Number:
  US09/587,942
• Time in Patent Office: 1,414 Days
• Field of Search: 623/1.15, 623/1.16, 623/1.18, 623/1.22, 623/1.17, 606/198
• US Class Current: 623/1.15
• CPC Class Codes: A61F 2/07 Stent-grafts
• 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 2002/30092 using shape memory or superelastic materials, e.g. nitinol
• CPC Class Codes: A61F 2002/30451 soldered or brazed or welded
• CPC Class Codes: A61F 2002/828 Means for connecting a plurality of stents allowing flexibility of the whole structure
• CPC Class Codes: A61F 2210/0019 operated at only one temperature whilst inside or touching the human body, e.g. constrained in a non-operative shape during surgery, another temperature only occurring before the operation
• CPC Class Codes: A61F 2220/0058 soldered or brazed or welded
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

A self-expanding metal wire stent made of shape memory alloy such as nitinol in which a plurality of spaced sections of closed cells are interconnected by straight sections of wire which may be parallel to the longitudinal axis of the stent or may be disposed angularly with respect thereto.

Claims

1. A stent comprised of a tube form body having a body wall structure of a geometric pattern of cells, the cells being substantially in the shape of a convex polygon, and defining a cell pattern as a plurality of spaced sections of interconnected cells defined by wire extending throughout the body, one or more of the plurality of adjacent spaced sections being defined by at least two rows of cells circumferentially distributed about the tube, adjacent spaced sections being connected to each other by at least one straight connector section of the wire, the at least one straight connector section having a first end and a second end, wherein the first end is in direct contact with one of the adjacent spaced sections and the second end is in direct contact with one of the adjacent spaced sections and wherein the at least one straight connector section is substantially straight between the first end and the second end, at least one cell of each of the adjacent spaced sections being unconnected to the adjacent spaced section.

2. The stent of claim 1 wherein the cells are of a hexagonal configuration.

3. The stent of claim 2 wherein at least some of the cells include two adjacent inverted sides which receive the at least one straight connector section.

4. The stent of claim 1 wherein the at least one straight connector section comprises two connector sections, the two connector sections being circumferentially spaced apart by about 180 degrees.

5. The stent of claim 1 wherein the at least one straight connector section comprises three connector sections, the three connector sections being circumferentially spaced apart by about 120 degrees.

6. The stent of claim 1 wherein at least a portion of the stent is constructed from nitinol alloy.

7. The stent of claim 1 further comprising a covering sleeve.

8. The stent of claim 1 wherein the at least one straight connector section of the wire comprise at least one continuous wire extending throughout the longitudinal length of the stent.

9. The stent of claim 8 wherein the at least one continuous wire comprises a plurality of wires.

10. The stent of claim 1 wherein the tube form body is constructed from a single wire.

11. The stent of claim 1, wherein the cells have no more than six internal angles.

12. The stent of claim 1, wherein there is no more than three straight connector sections between each pair of adjacent spaced section.

13. The stent of claim 1, the at least one straight connector section being disposed at an oblique angle relative to the longitudinal axis of the stent.

14. A stent comprised of a tube form body having a body wall structure of a geometric pattern of cells and defining a cell pattern as a plurality of spaced sections of interconnected cells defined by wire extending throughout the body, one or more of the plurality of adjacent spaced sections being defined by at least two rows of cells circumferentially distributed about the tube, adjacent spaced sections being connected to each other by at least one straight connector section of the wire, the at least one straight connector section having a first end and a second end, wherein the first end is in direct contact with one of the adjacent spaced sections and the second end is in direct contact with one of the adjacent spaced sections and wherein the at least one straight connector section is substantially straight between the first end and the second end, wherein there are a plurality of cells separating each adjacent straight connector sections, at least one cell of each of the adjacent spaced sections being unconnected to the adjacent spaced section, and further wherein the at least one straight connector section being disposed at an oblique angle relative to the longitudinal axis of the stent.

15. The stent of claim 14, wherein there is no more than three straight connector sections between each pair of adjacent spaced section.

16. The stent of claim 14, wherein the cells are in the shape of a convex polygon.

17. The stent of claim 14, wherein the cells are of a hexagonal configuration.

18. The stent of claim 14 wherein at least a portion of the stent is constructed from nitinol alloy.

19. The stent of claim 14 wherein the tube form body is constructed from a single wire.

20. A stent comprised of a tube form body having a body wall structure of a geometric pattern of cells and defining a cell pattern as a plurality of spaced sections of interconnected cells defined by wire extending throughout the body, one or more of the plurality of adjacent spaced sections being defined by at least two rows of cells circumferentially distributed about the tube, adjacent spaced sections being connected to each other by at least one straight connector section of the wire, the at least one straight connector section having a first end and a second end, wherein the first end is in direct contact with one of the adjacent spaced sections and the second end is in direct contact with one of the adjacent spaced sections and wherein the at least one straight connector section is substantially straight between the first end and the second end, the at least one straight connector section being disposed at an oblique angle relative to the longitudinal axis of the stent, wherein the cells are formed of a plurality of substantially straight segments, at least one cell of each of the adjacent spaced sections being unconnected to the adjacent spaced section, wherein the at least one straight connector section is comprised of at least one pair of adjoining wire segments.

21. The stent of claim 20, the at least one straight connector section being disposed at an oblique angle relative to the longitudinal axis of the stent.

22. The stent of claim 20, wherein there is no more than three straight connector sections between each pair of adjacent spaced section.

23. The stent of claim 20, wherein the cells are in the shape of a convex polygon.

24. The stent of claim 20, wherein the cells are of a hexagonal configuration.

25. The stent of claim 20 wherein at least a portion of the stent is constructed from nitinol alloy.

26. The stent of claim 20 wherein the tube form body is constructed from a single wire.