Intravascular stent

• US 6,241,760 B1
• Filed: 03/25/1997
• Issued: 06/05/2001
• Est. Priority Date: 04/26/1996
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Jang G. David
• Inventors: Jang, G. David
• Primary Examiner(s): Nguyen, Dinh X.
• Application Number:
  US08/824,142
• Time in Patent Office: 1,533 Days
• Field of Search: 623/1, 623/1.1, 623/1.15, 623/1.16, 623/1.2, 600/36, 606/191-200
• US Class Current: 623/1.12
• 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 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2230/0013 Horseshoe-shaped, e.g. crescent-shaped, C-shaped, U-shaped
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility

Abstract

A stent in a non-expanded state has a first column expansion strut pair. A plurality of the first column expansion strut pair form a first expansion column. A plurality of second column expansion strut pair form a second expansion column. A plurality of first serial connecting struts form a first connecting strut column that couples the first expansion column to the second expansion column. The first expansion column, the second expansion column, and the first connecting strut column form a plurality of geometric cells. At least a portion of the plurality are asymmetrical geometric cells.

Claims

1. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections with at least one of the linear sections being substantially parallel to at least one of the first expansion strut or the second expansion strut of the first expansion strut column; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells.

2. The stent of claim 1, wherein the first column expansion strut pair defines a first column loop slot, and the second column expansion strut pair defines a second column loop slot.

3. The stent of claim 2, wherein the first column loop slot is parallel to the second column loop slot.

5. The stent of claim 2, wherein a first column loop slot width is the same as a second column loop slot width.

10. The stent of claim 1, wherein at least a portion of the first connecting struts have first linear sections coupled to joining struts of first expansion strut pairs, second linear sections coupled to joining struts of second expansion strut pairs and third linear sections coupling the first and second linear sections.

11. The stent of claim 1, wherein the stent further includes a radiopaque marker.

12. The stent of claim 1, wherein the stent includes an electroplated material.

14. The stent of claim 1, further comprising:

a second connecting strut column formed of a plurality of second connecting struts.

4. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column, and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells, and

wherein the first column expansion strut pair defines a first column loop slot, and the second column expansion strut pair defines a second column loop slot, the first column loop slot being non-collinear to the second column loop slot.

6. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells, and

wherein the first column expansion strut pair defines a first column loop slot, and the second column expansion strut pair defines a second column loop slot, the first column loop slot shape being different than a second column loop slot shape.

7. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells, and

wherein a first distance between the first expansion strut and the second expansion strut of the first expansion column strut pair is different than a second distance between a first expansion strut and a second expansion strut of an adjacent first expansion column strut pair in the first expansion column.

8. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells, and

wherein a first distance between the first expansion strut and the second expansion strut of the second column expansion strut pair is different than a second distance between a first expansion strut and a second expansion strut of an adjacent second column expansion strut pair in the second expansion column.

9. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells;

wherein the first column expansion strut pair defines a first column loop slot, and the second column expansion strut pair defines a second column loop slot, and

wherein a spacing distance between the first expansion column strut pair and an adjacent expansion column strut pair in the first expansion column, and a spacing distance between the second column expansion strut pair and an adjacent second column expansion strut pair in the second expansion column are different.

13. A stent in a non-expanded state, comprising:

a first expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a second expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a first connecting strut column formed of a plurality of first connecting struts, a first connecting strut in the first connecting strut column including a plurality of linear sections, including a linear section in the plurality of linear sections being substantially parallel to at least one of the pairs of the first expansion strut and the second expansion strut in the first expansion column, wherein the first connecting strut column couples the first expansion column to the second expansion column and includes a first slant angle formed between two of the multiple linear sections.

15. A stent in a non-expanded state, comprising:

a first expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a second expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a first connecting strut column formed of a plurality of first connecting struts, the first connecting struts including multiple linear sections, wherein the first connecting strut column couples the first expansion column to the second expansion column and a first expansion strut in the first expansion column is circumferentially offset from a corresponding second expansion strut of the second expansion column.

16. The stent of claim 15, further comprising:

a plurality of first expansion columns;

a plurality of second expansion columns; and

a plurality of first connecting strut columns, each first connecting strut column coupling a first expansion column to a second expansion column.

17. The stent of claim 15, further comprising:

a third expansion column formed of a plurality of third expansion struts; and

a second connecting strut column formed of a plurality of second connecting struts coupling the second expansion column to the third expansion column, wherein at least a portion of the second expansion struts in the second column are circumferentially offset from a corresponding portion of the third expansion struts of the third expansion column.

18. The stent of claim 17, wherein at least a portion of the second connecting struts include a proximal section coupled to a distal section of a second expansion strut, a distal section coupled to a proximal section of a corresponding third expansion strut, a first linear section between the proximal and distal sections and a strut angle.

19. The stent of claim 17, wherein a ratio of a number of expansion struts in an expansion strut column to a number of connecting struts in a connecting strut column is 2 to 1.

20. The stent of claim 17, wherein the stent includes m first, second and third expansion columns, n expansion struts per column and n (m−

1)/2 first and second connecting struts.

21. The stent of claim 17, wherein the portion of the second connecting struts including a slant angle have a second linear section coupled to the first linear section and the third slant angle is formed between the first and second linear sections.

22. The stent of claim 18, wherein the portion of the second connecting struts including the slant angle have a second linear section coupled to the first linear section of the second connecting strut and the slant angle is formed between the first and second linear sections.

23. The stent of claim 22, wherein each slant angle of the second connecting struts is directed in a second circumferential direction that is in an opposite direction of a first circumferential direction of a slant angle of the first connecting struts.

24. The stent of claim 18, further comprising:

a radiopaque marker coupled to the stent.

25. A stent in a non-expanded state, comprising:

a first column expansion strut pair formed of a first expansion strut and a second expansion strut that is parallel to the first expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the first column expansion strut pair forming a first expansion column;

a second column expansion strut pair formed of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle, a plurality of the second column expansion strut pair forming a second expansion column; and

a plurality of first serial connecting struts forming a first connecting strut column, the plurality of first serial connecting struts coupling the first expansion column to the second expansion column, a first connecting strut in the first connecting strut column including multiple linear sections, the multiple linear sections including a first section that is vertical or includes at least a first section having a first slope a second section having a second slope, and a third section that is substantially parallel to at least one of the first expansion strut or the second expansion strut of the first expansion strut column; and

wherein the first expansion column, the second expansion column, and the first connecting strut column forming a plurality of geometric cells and at least a portion of the plurality are asymmetrical geometric cells.

26. A stent in a non-expanded state, comprising:

a first expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a second expansion column formed of a plurality of pairs of a first expansion strut and a parallel second expansion strut, the first and second expansion struts being coupled by a substantially linear joining strut that is joined to each of the first and second expansion struts at a non-perpendicular angle;

a first connecting strut column formed of a plurality of first connecting struts, a first connecting strut in the first connecting strut column including at least a first section that is either vertical or has a slope with a first vertical component, and a second section that has a slope with a second vertical component, wherein the first connecting strut column couples the first expansion column to the second expansion column and a first expansion strut in the first expansion column is circumferentially offset from a corresponding second expansion strut of the second expansion column.