Delivery of medical devices

Patent metadata

Field	Value
Publication number	US-9775733-B2
Application number	US-201514635456-A
Country	US
Kind code	B2
Filing date	Mar 2, 2015
Priority date	Aug 27, 2013
Publication date	Oct 3, 2017
Grant date	Oct 3, 2017

Abstract

A stent delivery system can include an elongate core member sized for insertion into a blood vessel. The core member can be configured to advance a stent toward a treatment location in the blood vessel. The core member can include a longitudinally extending tube having a helical cut extending along the tube. The helical cut can have an axial length of at least 50 cm and be continuous along the axial length.

First claim

What is claimed is:

1. A stent delivery system comprising a hypotube having an elongate tubular body and a continuous helical cut extending along the body, the cut having an axial length of at least 50 cm, the cut comprising first and second helical slots joined by a connection aperture, wherein a pitch of the cut varies along the first and second helical slots, wherein a segment of the cut is configured such that the pitch of the cut changed in magnitude, at both ends of the segment, by 0.2 mm/rotation or less.

2. The system of claim 1 , wherein the segment is located 10 cm or more from an endpoint of the cut.

3. The system of claim 1 , wherein the segment is located 20 cm or more from an endpoint of the cut.

4. The system of claim 1 , wherein the length of the segment is about 5 mm or less.

5. The system of claim 1 , wherein the pitch of the cut changes in magnitude at both ends of the segment, by 0.1 mm/rotation or less.

6. The system of claim 1 , wherein the cut comprises a third helical slot, joined to the second helical slot by a second connection aperture.

7. The system of claim 6 , wherein the pitch of the cut varies along the third helical slot.

8. The system of claim 1 , wherein the hypotube has a diameter of 2.3 mm or less.

9. The system of claim 1 , wherein the hypotube has a wall thickness of 0.010″ or less.

10. The system of claim 1 , wherein the first and second helical slots each have an axial length of less than or equal to about 15 cm.

11. An elongate core member sized for insertion into a blood vessel, the core member comprising a plurality of slots connected in an end-to-end manner to form a continuous helical void extending along the length of the core member, wherein adjoining slots intersect with a connection aperture extending through a wall of the core member and having a diameter greater than respective widths of the adjoining slots, wherein a segment of the void is configured such that a pitch of the void changes in magnitude, at both ends of the segment, by 0.2 mm/rotation or less.

12. The core member of claim 11 , wherein the length of the segment is about 5 mm or less.

13. The core member of claim 11 , wherein the pitch of the void changes in magnitude at both ends of the segment, by 0.1 mm/rotation or less.

14. The core member of claim 11 , wherein the length of the segment is about 5 mm or less.

15. The core member of claim 11 , wherein the length of the segment is about 3 mm or less.

16. The core member of claim 11 , wherein the length of the segment is about 2 mm or less.

17. The core member of claim 11 , wherein the length of the segment is about 1.0 mm.

18. The core member of claim 11 , wherein the segment is located 10 cm or more from an endpoint of the void.

19. The core member of claim 11 , wherein the segment is located 20 cm or more from an endpoint of the void.

20. The core member of claim 11 , wherein the segment is located 30 cm or more from an endpoint of the void.

21. The core member of claim 11 , wherein the segment is a first segment, and the pitch of the void changes in magnitude from the first segment to a second segment by 0.1 mm/rotation or less.

22. The core member of claim 11 , wherein the segment is a first segment, and the pitch of the void changes in magnitude from the first segment to a second segment by 0.01 mm/rotation or less.

23. The core member of claim 11 , wherein the segment is a first segment, and the pitch of the void changes in magnitude from the first segment to a second segment by 0.005 mm/rotation or less.

24. The core member of claim 11 , wherein each of the plurality of slots has an axial length of less than or equal to about 15 cm.

25. A medical device comprising the core member of claim 11 and a stent that is longitudinally movable by the core member.

26. The device of claim 25 , wherein the stent is a braided stent.

27. The device of claim 25 , wherein the stent is a laser-cut stent.

28. The device of claim 25 , wherein the stent is a roll-up stent.

Assignees

• Covidien Lp

Inventors

• Johnson Garrett
• Losordo Michael
• Skujins Peter

Classifications

• A61F2/86

  Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure · CPC title

• A61F2250/0018

  differing in elasticity, stiffness or compressibility · CPC title

• A61F2/90

  characterised by a net-like or mesh-like structure · CPC title

• A61F2230/0091

  helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section · CPC title

• A61F2/92

  Stents in the form of a rolled-up sheet expanding after insertion into the vessel {, e.g. with a spiral shape in cross-section} · CPC title