Intravascular stent

• US 9,078,778 B2
• Filed: 09/14/2011
• Issued: 07/14/2015
• Est. Priority Date: 04/26/1996
• 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): Shay, Randy
• Assistant Examiner(s): BARIA, DINAH N
• Application Number:
  US13/232,640
• Publication Number:
  US 20120065724A1
• Time in Patent Office: 1,399 Days
• Field of Search: 623/1.15, 623/1.16
• US Class Current: 1/1
• 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 2230/0054 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 and second expansion column, each consisting of a plurality of expansion strut pairs. An expansion strut pair includes a first expansion strut, a second expansion strut and a joining strut that couples the first and second expansion struts at one end. A connecting strut column, formed of a plurality of connecting struts couples the first and second expansion columns. Connecting struts include a proximal section, a distal section and an intermediate section. The proximal section is coupled to the corner of an expansion strut pair of the first expansion column, and the distal section is coupled to the joining strut of an expansion strut pair of the second expansion column intermediate the expansion strut pair first corner and the expansion strut pair second corner.

Claims

1. A stent comprising a plurality of longitudinally adjacent columns, each column formed of a plurality of struts, the plurality of columns including first columns and second columns, each of the struts of at least one of the first columns having a first width, each of the struts of at least one of the second columns having a second width less than the first width, the struts of at least one of the first columns interconnected by turns, one second column engaging two adjacent first columns, the struts of the second column extending between a turn of one of the adjacent first columns and a turn of the other of the adjacent first columns, each strut of the second column having at least two bends, a first end, and a second end, the first end longitudinally and circumferentially displaced from the second end.

2. The stent of claim 1, each strut of at least one of the second columns being curvilinear.

3. The stent of claim 1, the turn of the one adjacent first column and the turn of the other adjacent first column facing opposite directions.

4. The stent of claim 1, each first column having a first longitudinal width and each second column having a second longitudinal width less than the first longitudinal width.

5. The stent of claim 1, wherein a ratio of struts of a first column to struts of a second column is two to one.

6. The stent of claim 1, wherein the two adjacent first columns and the second column engaging the two adjacent first columns define a plurality of asymmetrical cell spaces.

7. The stent of claim 1, wherein the turn of the one adjacent first column and the turn of the other adjacent first column are circumferentially displaced.

8. The stent of claim 1, each turn of at least one of the first columns connecting two struts, each of the turns forming a first angle with one of the two struts and a second angle with the other of the two struts, the second angle being greater than the first angle.

9. The stent of claim 8, wherein the first angle is less than ninety degrees and the second angle is greater than ninety degrees.

10. The stent of claim 1, wherein the struts of each first column are uniformly spaced apart.

11. The stent of claim 1, wherein the struts of at least one of the first columns are spaced to define loop slots, the loop slots including first loop slots with a first width and second loop slots with a second width greater than the first width.

12. The stent of claim 11, wherein the first and second loop slots alternate with one another.