Delivery of medical devices

Patent metadata

Field	Value
Publication number	US-9827126-B2
Application number	US-201314040477-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Aug 27, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A stent delivery system can include a core member and a stent. The stent can be carried by an intermediate portion of the core member. The core member can have an elongate, spiral-cut tube extending proximally of the intermediate portion. The core member can have one or more flex zones having different bending stiffnesses.

First claim

What is claimed is:

1. A stent delivery system, comprising:
a core member having an intermediate portion and an elongate, spiral-cut tube extending proximally of the intermediate portion, the tube having a continuous spiral cut defining first and second flex zones, the second flex zone being proximal of the first flex zone, a first transition zone between the first and second flex zones, and a second transition zone distal of the second flex zone;
the first flex zone having a bending stiffness of less than 12 N*mm^2 so as to be navigable through the internal carotid artery bifurcation, the spiral cut of the tube in the first flex zone having a first pitch;
the second flex zone having a bending stiffness of greater than 60 N*mm^2, the spiral cut of the tube in the second flex zone having a second pitch different from the first pitch;
wherein the spiral cut of the tube in the first transition zone changes from the first pitch to the second pitch in a series of pitch changes, the spiral cut pitch in the first transition zone increasing by an overall percent increase from the first pitch to the second pitch, such that the average overall percent increase achieved per pitch change within the first transition zone is 15% or less,
wherein the spiral cut of the tube in the second transition zone decreases from the first pitch in a second series of pitch changes, the second series of pitch changes having a density along the second transition zone greater than five transitions per centimeter; and
a stent carried by the intermediate portion.

2. The system of claim 1 , wherein the pitch changes of the spiral cut of the tube have a density along the first transition zone greater than 1 transition per centimeter.

3. The system of claim 1 , wherein the pitch of the spiral cut of the tube increases by over 150% from the first pitch to the second pitch in a proximal direction in the first transition zone.

4. The system of claim 1 , wherein the first flex zone length is greater than 60 mm.

5. The system of claim 1 , wherein the second flex zone length is greater than 30 mm.

6. The system of claim 1 , wherein the second flex zone bending stiffness is 60-100 N*mm^2.

7. The system of claim 1 , wherein the first flex zone is navigable through the M1 segment of the middle cerebral artery (MCA) to the M1 bifurcation.

8. The system of claim 7 , wherein the second flex zone is navigable to the common carotid artery.

9. The system of claim 1 , wherein a distal end of the first flex zone is spaced 8-12 mm from a proximal end of the stent.

10. The system of claim 9 , wherein a distal end of the second flex zone is spaced 225-275 mm from a proximal end of the stent.

11. The system of claim 1 , wherein the spiral cut of the tube prevails along a cut length of the tube, the cut length being greater than 50 cm.

12. The system of claim 11 , wherein the spiral cut is contiguous along the cut length.

13. A stent delivery system, comprising:
a core member having an intermediate portion and an elongate, spiral-cut tube extending proximally of the intermediate portion, the tube having an uncut-tube bending stiffness and a continuous spiral cut defining (i) a first flex zone located near a distal end of the tube, a (ii) a first transition zone extending proximally from the first flex zone, and (iii) a second transition zone distal of the first flex zone;
the first flex zone having a bending stiffness of less than 5% of the uncut-tube bending stiffness so as to be navigable through the carotid siphon, the spiral cut of the tube in the first flex zone having a first pitch;
wherein the spiral cut of the tube in the first transition zone increases from the first pitch in a proximal direction in a series of pitch changes, the spiral cut pitch in the first transition zone increasing by an overall percent increase from the first pitch, such that the average overall percent increase achieved per pitch change within the first transition zone is 15% or less,
wherein the spiral cut of the tube in the second transition zone decreases from the first pitch in a second series of pitch changes, the second series of pitch changes having a density along the second transition zone greater than five pitch changes per centimeter; and
a stent carried by the intermediate portion.

14. The system of claim 13 , wherein the pitch changes of the spiral cut of the tube have a density along the first transition zone greater than 1 pitch change per centimeter.

15. The system of claim 13 , wherein the pitch of the spiral cut of the tube increases by over 150% from the first pitch in a proximal direction in the first transition zone.

16. The system of claim 13 , wherein the first flex zone length is greater than 60 mm.

17. The system of claim 13 , wherein the first flex zone is navigable to the M1 bifurcation.

18. The system of claim 13 , wherein a distal end of the first flex zone is spaced 8-12 mm from a proximal end of the stent.

19. The system of claim 13 , wherein the spiral cut of the tube prevails along a cut length of the tube, the cut length being greater than 50 cm.

20. The system of claim 19 , wherein the spiral cut is contiguous along the cut length.

21. The system of claim 13 , wherein the tube has an outer diameter of 1.02 mm or less, and a wall thickness of 0.26 mm or less.

22. A stent delivery system, comprising:
a core member having an intermediate portion and an elongate, spiral-cut tube extending proximally of the intermediate portion, the tube having a continuous spiral cut defining first and second flex zones, the second flex zone being proximal of the first flex zone, a first transition zone between the first and second flex zones, and a second transition zone distal of the first flex zone;
the first flex zone having a bending stiffness of less than 220 N*mm^2 so as to be navigable through the aortic arch, the spiral cut of the tube in the first flex zone having a first pitch,
the second flex zone having a bending stiffness of greater than 250 N*mm^2, the spiral cut of the tube in the second flex zone having a second pitch different from the first pitch,
wherein the spiral cut of the tube in the first transition zone changes from the first pitch to the second pitch in a series of pitch changes, the spiral cut pitch in the first transition zone increasing by an overall percent increase from the first pitch to the second pitch, such that the average overall percent increase achieved per pitch change within the first transition zone is 10% or less,
wherein the spiral cut of the tube in the second transition zone decreases from the first pitch in a second series of pitch changes, the second series of pitch changes having a density along the second transition zone greater than five pitch changes per centimeter; and
a stent carried by the intermediate portion.

23. The system of claim 22 , wherein the pitch changes of the spiral cut of the tube have a density along the first transition zone greater than 1 pitch change per centimeter.

24. The system of claim 22 , wherein the pitch of the spiral cut of the tube increases by over 35% from the first pitch to the second pitch in a proximal direction in the first transition zone.

25. The system of claim 22 , wherein the first flex zone length is greater than 200 mm.

26. The system of claim 22 , wherein the second flex zone length is greater than 30 mm.

27. The system of claim 2

Assignees

• Covidien Lp

Inventors

• Losordo Michael L
• Skujins Peter
• Johnson Garrett

Classifications

• A61M25/008

  Strength or flexibility characteristics of the catheter tip · CPC title

• A61F2002/9528

  for retrieval of stents · CPC title

• A61F2/97 Primary

  the outer sleeve being splittable · CPC title

• A61F2002/9505

  having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument · CPC title

• A61F2/95

  Instruments specially adapted for placement or removal of stents or stent-grafts · CPC title