Stent with Anti-Migration Features

• US 20130172983A1
• Filed: 12/20/2012
• Published: 07/04/2013
• Est. Priority Date: 12/29/2011
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Clerc, Claude, Tischler, Brian Joseph, McPhail, Mark, Doran, Burns P., Ross, Daniel
• Granted Patent: US 9,675,473 B2
• Time in Patent Office: Days
• US Class Current: 623/1.16
• CPC Class Codes: A61F 2/82 Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents stent-grafts for tubular structures of the body other than blood vessels A61F2/04; stent-grafts for blood vessels A61F2/07; instruments specially adapted for placement or removal of stents or stent-grafts A61F2/95; for closing wounds, or holding wounds closed A61B17/04 - A61B17/115; dilators A61M29/00
• CPC Class Codes: A61F 2/848 having means for fixation to the vessel wall, e.g. barbs
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2002/8483 Barbs
• 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
• CPC Class Codes: A61F 2220/0016 with sharp anchoring protrusions, e.g. barbs, pins, spikes
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A stent has a first end region, a middle region, and a second end region, each region including a plurality of strut columns. The stent includes at least one barb. Each barb in an expanded state is at an angle relative to the outer surface of the stent.

Claims

1. A stent having an as cut state and a parent state, the stent comprising:

a first end;

a first end region, the first end region comprising a first strut column, a second strut column, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a middle region, the middle region comprising;

a plurality of strut columns, each strut column comprising a plurality of struts interconnected by turns, the plurality of strut columns comprising a plurality of first strut columns;

a plurality of peak to peak connectors extending between adjacent strut column;

at least one barb, each barb extending from one of the plurality of first strut columns, each barb having an unexpanded state and an expanded state, each barb being in the unexpanded state when the stent is in the as cut state, at least some of the barbs being in the expanded state when the stent is in the parent state, the barb in the expanded state being at an angle relative to an outer surface of the stent;

a second end region, the second end region comprising a first strut column, a second strut column, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a plurality of first peak to valley connectors engaging the first end region and the middle region;

a plurality of second peak to valley connectors engaging the second end region and the middle region; and

a second end;

wherein when the stent is in the parent state, the middle region has a diameter that is smaller than a diameter of the first end region and smaller than a diameter of the second end region.

2. The stent of claim 1, each barb having a focal removal, a bent tip region, or a focal removal and a bent tip region.

3. The stent of claim 1, each barb extending from one strut column of the middle region and nesting between two struts of an adjacent strut column of the middle region.

4. The stent of claim 1, the middle region of the stent further comprising a second strut column, the second strut column forming an end of the middle region, one first strut column forming another end of the middle region, the second strut column having a different configuration than a configuration of the first strut columns, the second strut column having no barbs extending therefrom.

5. The stent of claim 4, the turns of the first strut columns comprising first turns and second turns, the first turns having a smaller circumferential width than the second turns, the turns of the second strut column comprising only first turns.

6. The stent of claim 1, each first strut column having a first end facing the first end of the stent and a second end facing the second end of the stent, the turns of each first strut column comprising first turns and second turns, the first end turns having a smaller circumferential width than the second turns,

the first end comprising first turns and second turns forming a first pattern repeating along the first middle strut column, the first pattern being first turn-second turn-second turn-second turn;

the second end comprising only first turns;

the second middle strut column comprising only first turns.

7. The stent of claim 1, each first strut column having a first end facing the first end of the stent and a second end facing the second end of the stent, the turns of each first strut column comprising first turns and second turns, the first end turns having a smaller circumferential width than the second turns,

the first end of the first strut columns comprising first turns and second turns forming a first pattern repeating along the first middle strut column, the first pattern being first turn-second turn-first turn-second turn;

the second end of the first strut column comprising only first turns;

the second middle strut column comprising only first turns.

8. The stent of claim 1, the plurality of first peak to valley connectors and the plurality of second peak to valley connectors being at an angle to an outer surface of the middle region when the stent is in the parent state.

9. The stent of claim 1, the plurality of first peak to valley connectors extending between a strut column forming an end of the first end region and a strut column forming an end of the middle region, and the plurality of second peak to valley connectors extending between a strut column forming an end of the second end region and a strut column forming another end of the middle region.

10. A stent having an as cut state and a parent state, the stent comprising:

a first end;

a first end region, the first end region comprising a first strut column, a second strut column, a plurality of barbs, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a middle region, the middle region comprising a plurality of middle strut columns, adjacent strut columns connected by a plurality of peak to peak connectors;

a second end region, the second end region comprising a first strut column, a second strut column, a plurality of barbs, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a plurality of first peak to valley connectors engaging the first end region and the middle region;

a plurality of second peak to valley connectors engaging the second end region and the middle region; and

a second end;

wherein each strut column comprises a plurality of struts interconnected by turns and at least some of the barbs being in the expanded state when the stent is in the parent state, the barb in the expanded state being at an angle relative to an outer surface of the stent.

11. The stent of claim 10, wherein each barb of the first end region faces towards the second end and each barb of the second end region faces towards the first end.

12. The stent of claim 10, some of the struts of the second strut column of the first end region having one of the plurality of barbs extending therefrom and some of the struts of the first strut column of the second end region having one of the plurality of barbs extending therefrom.

13. The stent of claim 10, the plurality of middle strut columns comprising a plurality of first middle strut columns each having a first configuration and a second middle strut column having a second configuration, the second strut column forming an end of the middle region, the first configuration different than the second configuration.

14. The stent of claim 13, each first middle strut column having a first end facing the first end of the stent and a second end facing the second end of the stent, the turns of each first middle strut column comprising first turns and second turns, the first turns having a smaller circumferential width than the second turns,

the first end of each first middle strut columns comprising first turns and second turns forming a first pattern repeating along the first middle strut column, the first pattern being first turn-second turn-first turn-second turn;

the second end of each first middle strut column comprising only first turns;

the second middle strut column comprising only first turns.

15. A stent having an as cut state and a parent state, the stent comprising:

a first end;

a first end region, the first end region comprising a first strut column, a second strut column, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a middle region, the middle region comprising a plurality of middle strut columns, adjacent middle strut columns connected by a plurality of peak to peak connectors;

a second end region, the second end region comprising a first strut column, a second strut column, and a plurality of peak to valley connectors connecting the first strut column and the second strut column;

a plurality of first peak to valley connectors engaging the first end region and the middle region;

a plurality of first barbs;

a plurality of second peak to valley connectors engaging the second end region and the middle region,

a plurality of second barbs; and

a second end;

some of the first peak to valley connectors having a first barb extending therefrom, some of the second peak to valley connectors having a second barb extending therefrom, at least some of the barbs being in the expanded state when the stent is in the parent state, the barb in the expanded state being at an angle relative to an outer surface of the stent.

16. The stent of claim 15, wherein the first barbs extend towards the first end of the stent and the second barbs extend towards the second end of the stent.

17. The stent of claim 15, each first barb having two legs extending from circumferentially adjacent first peak to valley connectors and each second barb having two legs extending from circumferentially adjacent second peak to valley connectors.

18. The stent of claim 15, wherein each first barb nests between two adjacent struts of the second strut column of the first end region and each second barb nests between two adjacent struts of the first strut column of the second end region.

19. The stent of claim 17, the plurality of middle strut columns comprising a plurality of first middle strut columns each having a first configuration and a second middle strut column having a second configuration, the first configuration different than the second configuration, one first middle strut column forming one end of the middle region and the second strut column forming another end of the middle region.

20. The stent of claim 19, each first middle strut column having a first end facing the first end of the stent and a second end facing the second end of the stent, the turns of each first middle strut column comprising first turns and second turns, the first turns having a smaller circumferential width than the second turns,

the first end of each first middle strut columns comprising first turns and second turns forming a first pattern repeating along the first middle strut column, the first pattern being first turn-second turn-first turn-second turn;

the second end of each first middle strut column comprising only first turns; and

the second middle strut column comprising only first turns.