Selective treatment of stent side branch petals

• US 20060271161A1
• Filed: 05/26/2005
• Published: 11/30/2006
• Est. Priority Date: 05/26/2005
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Grotheim, Kevin, Meyer, Michael P., Gregorich, Daniel
• Application Number:
  US11/138,202
• Publication Number:
  US 20060271161A1
• Time in Patent Office: Days
• US Class Current: 623/1.150
• CPC Class Codes: A61F 2/856 Single tubular stent with a side portal passage
• 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 2002/821 Ostial stents
• CPC Class Codes: A61F 2002/91508 the meander having a difference in amplitude along the band
• CPC Class Codes: A61F 2002/91516 the meander having a change in frequency along the band
• 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 2002/91575 connected peak to trough

Abstract

A stent may include a side branch cell comprising a plurality of petals. When deployed in a bifurcated vessel, petals located near the inside of the bifurcation may experience high amounts of bending. A petal may include a predetermined bending region in which the petal is treated and may have less bending strength. Therefore, the petal will bend at the predetermined bending region in a predetermined fashion. A bending region may be heat-treated to reduce strength, may comprise less cross-sectional area than other portions of the petal, etc.

Claims

1. A stent comprising a plurality of interconnected strut members, a plurality of said interconnected strut members comprising a plurality of petals including a first petal, the plurality of petals defining a side branch cell, the first petal including a bending region, the bending region being selectively treated to reduce the strength of the bending region when compared to a region of the first petal adjacent to the bending region.

2. The stent of claim 1, wherein said bending region includes less stent material than other portions of the first petal.

3. The stent of claim 1, wherein said bending region includes an aperture.

4. The stent of claim 1, wherein said bending region includes a plurality of perforations.

5. The stent of claim 4, wherein said perforations are aligned in a direction across said bending region.

6. The stent of claim 1, wherein said bending region includes an indentation in a surface of said bending region.

7. The stent of claim 1, wherein said bending region is heat treated.

8. The stent of claim 1, wherein the first petal is located near an axial extremity of the side branch cell.

9. A stent comprising a plurality of interconnected strut members, a plurality of said interconnected strut members comprising a plurality of petals including a first petal, the plurality of petals defining a side branch cell, the first petal including a bending region, wherein the cross-sectional area of the bending region is less than the cross-sectional area of the first petal adjacent to the bending region.

10. The stent of claim 9, wherein the bending region comprises a notch.

11. The stent of claim 10, wherein the notch is made in an interior surface of the stent.

12. The stent of claim 10, wherein the bending region comprises a plurality of notches.

13. The stent of claim 9, wherein the bending region comprises a plurality of perforations.

14. The stent of claim 13, wherein said perforations are aligned in a direction across the width of the first petal element which includes the bending region.

15. The stent of claim 9, wherein the first petal further comprises a second bending region.

16. The stent of claim 15, wherein a bending axis of the bending region is aligned with a bending axis of the second bending region.

17. The stent of claim 15, wherein the first petal comprises a first strut, a turn and a second strut, the bending region being located on the first strut, the second bending region being located on the second strut.

18. The stent of claim 9, wherein the areas of the first petal outside of the bending region have a constant strut width.

19. The stent of claim 18, wherein the areas of the first petal outside of the bending region have a constant strut thickness.

20. A stent comprising a plurality of interconnected struts defining a primary body portion having a substantially cylindrical shape and a plurality of cells including a side branch cell, the side branch cell shaped differently than another cell of the stent, the side branch cell comprising a plurality of petals including a first petal, at least a portion of each petal constructed and arranged to deploy in a radial outward direction beyond the substantially cylindrical shape of the primary body portion, the first petal including a bending region, wherein the cross-sectional area of the bending region is less than the cross-sectional area of the first petal in a location adjacent to the bending region.