A Mechanism to Ensure Placement of Ostial Renal Stents

• US 20070239252A1
• Filed: 04/10/2006
• Published: 10/11/2007
• Est. Priority Date: 04/10/2006
• Status: Abandoned Application

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Chu, Jack, Ganesan, Prema, Greenan, Trevor, Rust, Matthew, Morris, Jonathan, Machek, James, Hopkins, Darren, Moriarty, James
• Application Number:
  US11/279,206
• Publication Number:
  US 20070239252A1
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/821 Ostial stents
• CPC Class Codes: A61F 2250/0039 differing in diameter

Abstract

A method of using a delivery system includes advancing a stent to be located within an ostium of a vessel; advancing a basket actuation button of a handle to deploy a basket of the basket assembly; moving the basket into engagement with a parent vessel, the basket having a larger diameter than a diameter of the ostium; deploying the stent within an ostial lesion of the vessel; and contracting the basket.

Claims

1. A delivery system comprising:

a stent dilation balloon at a distal end of said delivery system;

a stent on said stent dilation balloon; and

a basket assembly proximally adjacent to said stent dilation balloon, said basket assembly comprising at least one super-elastic self-expanding basket spline.

2. The delivery system of claim 1 further comprising a balloon catheter, a basket anchor of said basket assembly being coupled to said balloon catheter.

3. The delivery system of claim 2 further comprising an inner member, wherein a balloon inflation lumen is defined between said balloon catheter and said inner member.

4. The delivery system of claim 3 wherein said stent dilation balloon is communicatively coupled to said balloon inflation lumen.

5. The delivery system of claim 3 wherein said inner member defines a guide wire lumen.

6. The delivery system of claim 1 wherein said at least one super-elastic self-expanding basket spline comprises a thin flexible strip.

7. The delivery system of claim 6 wherein said thin flexible strip comprises a memory metal.

8. The delivery system of claim 1 further comprising a handle and a balloon catheter, said balloon catheter comprising:

a basket deployment region proximally adjacent to said stent; and

a basket pushrod region extending between said basket deployment region and said handle.

9. The delivery system of claim 8 wherein said basket deployment region comprises a cylindrical outer surface having a first radius and wherein said basket pushrod region comprises a cylindrical outer surface having a second radius, said first radius being less than said second radius.

10. The delivery system of claim 8 wherein said balloon catheter further comprises a radial annular surface at a junction of said basket deployment region and said basket pushrod region.

11. The delivery system of claim 10 wherein said radial annular surface extends radially outwards from said cylindrical outer surface of said basket deployment region to said cylindrical outer surface of said basket pushrod region.

12. The delivery system of claim 11 wherein said basket pushrod region comprises at least one basket pushrod lumen ending distally from at least one basket pushrod lumen aperture in said radial annular surface.

13. The delivery system of claim 8 wherein said basket pushrod region comprises at least one basket pushrod lumen.

14. The delivery system of claim 13 wherein said at least one super-elastic self-expanding basket spline extends through said at least one basket pushrod lumen and to said handle, said handle further comprising a basket actuation button coupled to said at least one super-elastic self-expanding basket spline.

15. The delivery system of claim 14 wherein said at least one super-elastic self-expanding basket spline extends proximally from a basket anchor coupled to said balloon catheter adjacent a cylindrical outer surface of said basket deployment region and into said at least one basket pushrod lumen.

16. The delivery system of claim 1 wherein said at least one super-elastic self-expanding basket spline are bent to form a basket.

17. The delivery system of claim 16 wherein said at least one super-elastic self-expanding basket spline curve radially outwards to apexes.

18. The delivery system of claim 1 further comprising a basket deployment sheath coupled to said at least one super-elastic self-expanding basket spline at a distal end of said basket deployment sheath.

19. The delivery system of claim 18 further comprising a handle comprising a basket actuation button, a proximal end of said basket deployment sheath being coupled to said basket actuation button.

20. The delivery system of claim 16 wherein said basket comprises a forward stop.

21. The delivery system of claim 20 further comprising a balloon catheter, wherein a basket anchor of said basket assembly is coupled to said balloon catheter, and wherein said forward stop is distal to said basket anchor.

22. The delivery system of claim 21 wherein said forward stop is in the shape of an annulus.

23. The delivery system of claim 21 wherein said forward stop is proximal of said stent.

24. The delivery system of claim 1 wherein said at least one super-elastic self-expanding basket spline terminate at basket spline tips.

25. The delivery system of claim 24 wherein said basket spline tips comprise a material selected from the group consisting of nitinol, stainless steel and plastic.

26. The delivery system of claim 24 further comprising a sheath constraining said at least one super-elastic self-expanding basket spline.

27. The delivery system of claim 24 wherein said basket spline tips define a forward stop.

28. A method comprising:

deploying a graft within a parent vessel, said graft comprising a branch vessel opening;

advancing a stent to be located within said branch vessel opening;

retracting a sheath to deploy basket splines, said basket splines comprising basket spline tips;

moving said basket spline tips into engagement with said graft, said basket spline tips defining a forward stop having a larger diameter than a diameter of said branch vessel opening;

deploying said stent within said branch vessel opening; and

advancing said sheath to collapse said basket splines.

29. A delivery system comprising:

a self-expanding stent at a distal end of said delivery system;

a basket assembly proximally adjacent said stent, said basket assembly comprising at least one super-elastic self-expanding basket spline; and

a stent delivery sheath constraining said self-expanding stent.

30. The delivery system of claim 29 wherein said stent delivery sheath comprises at least one slot aligned with said at least one super-elastic self-expanding basket spline.

31. The delivery system of claim 30 wherein said stent delivery sheath further comprises at least one breakaway corresponding to said at least one slot.

32. The delivery system of claim 31 wherein said at least one breakaway readily tears upon application of force to said at least one breakaway.

33. The delivery system of claim 32 wherein said at least one breakaway comprises scores in said stent delivery sheath.

34. The delivery system of claim 32 wherein said at least one breakaway comprises perforations in said stent delivery sheath.

35. A method comprising:

advancing a stent to be located within an ostium of a vessel;

advancing a basket actuation button of a handle to deploy a basket;

moving said basket into engagement with a parent vessel, said basket having a larger diameter than a diameter of said ostium;

deploying said stent within an ostial lesion of said vessel; and

contracting said basket.

36. The method of claim 35 wherein said deploying said stent comprises expanding a stent dilation balloon on which said stent is located.

37. The method of claim 35 wherein said deploying said stent comprises retracting a stent delivery sheath to expose said stent and allow said stent to self-expand.

38. A delivery system comprising:

a stent dilation balloon at a distal end of said delivery system;

a stent on said stent dilation balloon;

a self-expanding basket proximally adjacent to said stent dilation balloon; and

a sheath for deploying and recapturing said basket.

39. The delivery system of claim 38 wherein said basket is in the form of a spiral wire.

40. The delivery system of claim 38 wherein said basket is in the form of braided wires.

41. The delivery system of claim 38 wherein said basket is in the form of diamond shaped segments.

42. The delivery system of claim 38 wherein said basket is in the form of a distal ring segment having an alternating repeating pattern.

43. The delivery system of claim 42 wherein each proximal crown of said distal ring segment is connected to a spline of said delivery system.

44. The delivery system of claim 42 wherein some proximal crowns of said distal ring segment are unconnected.

45. The delivery system of claim 38 wherein said basket has a minimum diameter as said sheath and radially increases in diameter distally from said sheath.