BIOERODIBLE POLYMERIC STENT SCAFFOLDING PATTERN

• US 20160067070A1
• Filed: 09/04/2015
• Published: 03/10/2016
• Est. Priority Date: 09/04/2014
• Status: Abandoned Application

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Boismier, Dennis A.
• Application Number:
  US14/846,294
• Publication Number:
  US 20160067070A1
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 2002/9155 Adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/91575 connected peak to trough
• CPC Class Codes: A61F 2210/0004 bioabsorbable
• CPC Class Codes: A61F 2230/0069 cylindrical
• CPC Class Codes: A61F 2250/0036 differing in thickness
• CPC Class Codes: A61F 2250/0098 radio-opaque, e.g. radio-opaque markers

Abstract

A stent includes a tubular network of struts cut from a bioerodible polymer tube. The tubular network includes a plurality of bands and a plurality of connectors. Each band includes at least nine peaks. Each band being connected to one or more adjacent bands by at least two connectors.

Claims

1. A stent comprising a tubular network of struts comprising a bioerodible polymer, the tubular network comprising a plurality of bands and a plurality of connectors, each band comprising at least nine peaks, each band being connected to one or more adjacent bands by at least two connectors.

2. The stent of claim 1, wherein each band is connected to one or more adjacent bands by at least three connectors.

3. The stent of claim 1, wherein each band consists of nine peaks.

4. The stent of claim 1, wherein the tubular network has a wall thickness of less than 150 microns.

5. The stent of claim 1, wherein the tubular network has a wall thickness of about 120 microns.

6. The stent of claim 1, wherein the bands and connectors each having a width of between 180 and 250 microns.

7. The stent of claim 1, wherein the stent comprises at least six bands including two end bands and at least four internal bands.

8. The stent of claim 7, wherein each end band is connected to an internal band by more than four or more connectors, wherein each internal band is connected to at least one other internal band by only 3 connectors.

9. The stent of claim 8, wherein each end band is connected to an internal band by nine connectors.

10. The stent of claim 7, wherein one or more connectors connecting an end band to an internal band includes a radiopaque marker.

11. The stent of claim 1, wherein each connector connects two opposite peaks of adjacent bands.

12. The stent of claim 1, wherein each band has a peak width to strut width ratio of between 0.9 and 1.25.

13. The stent of claim 1, wherein the stent is crimped to a crimped diameter of less than 1.40 mm and an expanded diameter of between 2.0 mm and 5.0 mm when each peak is expanded to an angle of 90 degrees

14. The stent of claim 13, wherein the crimped diameter is between 1.1 mm and 1.25 mm and the expanded diameter is about 3 mm when each peak is expanded to an angle of 90 degrees.

15. The stent of claim 13, wherein each band includes at least 10 peaks and the expanded diameter is at least 3.5 mm when each peak is expanded to an angle of 90 degrees.

16. The stent of claim 1, wherein the bioerodible polymer comprise a polymer selected from the group consisting of PLGA, PDLA, PLLA, PCL, PHBV, POE, PEO/PBTP, one or more polyamides, one or more polyanhides, or a combination thereof.

17. The stent of claim 1, wherein the bioerodible polymer comprises PLLA having a molecular weight of at least 30,000 Daltons.

18. The stent of claim 1, wherein the bioerodible polymer comprises PLLA having and a Tg of at least 40°

C.

19. The stent of claim 1, wherein the stent includes at least 3 radiopaque markers at each end of the stent.

20. A stent comprising:

a tubular network of struts cut from a tube comprising PLLA, the tube having a wall thickness of 120 microns or less, the tubular network comprising at least six bands each having nine peaks and at least three connectors extending between and connecting opposite peaks of adjacent bands, each band or connector having a width of between 180 microns and 230 microns, the stent having a nominal diameter of 3.0 mm and being crimped to a crimped diameter of between 1.1 mm and 1.25 mm.