Intravascular stent and assembly

• US 7,766,956 B2
• Filed: 11/26/2003
• Issued: 08/03/2010
• Est. Priority Date: 09/22/2000
• Status: Expired due to Fees

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Jang, G. David
• Primary Examiner(s): Bui; Vy Q
• Application Number:
  US10/723,644
• Publication Number:
  US 20040133271A1
• Time in Patent Office: 2,442 Days
• Field of Search: 623/1.15, 606/191, 606/194, 606/195
• US Class Current: 623/1.15
• 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 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 2002/91583 by a bridge, whereby at least one of its ends is connected along the length of a strut between two consecutive apices within a band
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

Various intravascular stents, such as intracoronary stents, include improved expansion and connecting strut designs. Such stents can be both very flexible and fully cover vessel surface inside the vascular lumen, and be well designed for both the delivery phase and the deployed phase of the stent life cycle.

Claims

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

a first expansion column including individual first expansion struts forming a plurality of first expansion strut pairs, each first expansion strut pair including a first expansion strut having a stair-step region at distal end thereof and a stair-step region at a proximal end thereof, two adjacent first expansion strut pairs sharing a common strut;

a second expansion column including individual second expansion struts forming a plurality of second expansion strut pairs, each second expansion strut pair including a second expansion strut having a stair-step region at distal end thereof and a stair-step region at a proximal end thereof, two adjacent second expansion strut pairs sharing a common strut;

a first connecting strut column including a plurality of non-intersecting individual first connecting struts that couple only the first and second expansion columns, wherein each of an individual first connecting strut includes a proximal section and a distal section, the proximal section extending from the stair-step region at the distal end of one of the first expansion struts, the distal section extending from the stair-step region at the proximal end of one of the second expansion struts,

each of the proximal sections having a longitudinal axis and each of the distal sections having a longitudinal axis, at least one of the longitudinal axis of each of the proximal sections and the longitudinal axis of each of the distal sections being parallel with at least one of a longitudinal axis of each first expansion strut and a longitudinal axis of each second expansion strut;

wherein

each first and second expansion strut includes a straight segment between the stair-step region at distal end thereof and the stair-step region at proximal end thereof.

2. The stent of claim 1, wherein each first connecting strut of the first connecting strut column has a stair-step configuration.

3. The stent of claim 1, wherein each first expansion strut pair of the first expansion column includes a straight strut.

4. The stent of claim 3, wherein each second expansion strut pair of the second expansion column includes a straight strut.

5. The stent of claim 1, wherein the proximal section of each first connecting strut has an edge that is a linear extension of an edge of an expansion strut in the first expansion column, and the distal section of each first connecting strut has an edge that is a linear extension of an edge of an expansion strut in the second expansion column.

6. The stent of claim 5, wherein a strain relief notch is formed where the edge of the proximal section of each first connecting strut in the first connecting strut column is conjoined with the edge of the expansion strut of the first expansion column, and a strain relief notch is formed where the edge of the distal section of each first connecting strut in the first connecting strut column is conjoined with edge of the expansion strut of the second expansion column.

7. The stent of claim 1, wherein the distal section of each first connecting strut of the first connecting strut column has a greater length than its proximal section.

8. The stent of claim 1, wherein each first connecting strut of the first connecting column is ipsilaterally conjoined to the first and second expansion columns.

9. The stent of claim 1, wherein the longitudinal axis of the proximal section of each first connecting strut of the first connecting strut column is non-parallel to the longitudinal axis of its distal section.

10. The stent of claim 1, wherein each first connecting strut of the first connecting strut column includes an intermediate section coupled to the proximal and distal sections of the first connecting strut.

11. The stent of claim 10, wherein the intermediate section of each first connecting strut of the first connecting strut column has a greater length than a length of its proximal section.

12. The stent of claim 10, wherein at least a portion of the intermediate section of each first connecting strut of the first connecting strut column has a curvilinear geometric configuration.

13. The stent of claim 12, wherein at least a portion of the proximal and distal sections of each first connecting strut of the first connecting strut column have a curvilinear geometric configuration.

14. The stent of claim 10, wherein the intermediate section of each first connecting strut of the first connecting strut column has a longitudinal axis that is nonparallel to a longitudinal axis of the stent.

15. The stent of claim 10, wherein the intermediate section of each first connecting strut of the first connecting strut column has a longitudinal axis that is positioned diagonally relative to a longitudinal axis of the stent.

16. The stent of claim 10, wherein the intermediate section of each first connecting strut of the first connecting strut column has a longitudinal axis that extends in a vertically diagonal direction relative to a longitudinal axis of the stent.

17. The stent of claim 10, wherein at least a portion of the intermediate section of each first connecting strut of the first connecting strut column is in close proximity to an expansion strut pair of the first expansion column.

18. The stent of claim 1, wherein a width of the proximal section of each first connecting strut in the first connecting strut column is less than a width of the expansion strut of the first expansion column, and a width of the distal section of each first connecting strut of the first connecting strut column is less than a width of the expansion strut of the second expansion column.

19. The stent of claim 1, further comprising:

a plurality of expansion columns coupled by a plurality of connecting strut columns.

20. The stent of claim 1, further comprising:

a third expansion column including individual expansion struts forming a plurality of expansion strut pairs, wherein two adjacent expansion strut pairs share a common strut;

a second connecting strut column including a plurality of non-intersecting individual second connecting struts that couple only the second and third expansion columns, wherein each of an individual second connecting strut of the second connecting strut column includes a proximal section with a longitudinal axis that is parallel with a longitudinal axis of an expansion strut in the second expansion column, and a distal section with a longitudinal axis that is parallel with a longitudinal axis of an expansion strut of the third expansion column.