DELIVERY OF MEDICAL DEVICES

• US 20150238336A1
• Filed: 03/02/2015
• Published: 08/27/2015
• Est. Priority Date: 08/27/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: JOHNSON, Garrett, LOSORDO, Michael, SKUJINS, Peter
• Granted Patent: US 9,775,733 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 2/86 Stents in a form characterised by the wire-like elements; Stents in the form characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/90 characterised by a net-like or mesh-like structure
• CPC Class Codes: A61F 2/92 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 Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2/962 having an outer sleeve
• CPC Class Codes: A61F 2/966 with relative longitudinal movement between outer sleeve and prosthesis, e.g. using a push rod
• CPC Class Codes: A61F 2/97 the outer sleeve being splittable
• CPC Class Codes: A61F 2002/823 Stents, different from stent-grafts, adapted to cover an aneurysm
• CPC Class Codes: A61F 2002/9505 having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument
• CPC Class Codes: A61F 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2230/0091 helically-coiled or spirally-coiled, i.e. having a 2-D spiral cross-section
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility
• CPC Class Codes: A61M 25/0053 having a variable stiffness along the longitudinal axis, e.g. by varying the pitch of the coil or braid
• CPC Class Codes: A61M 25/008 Strength or flexibility characteristics of the catheter tip

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.

Claims

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.

2. The system of claim 1, wherein a segment of the cut is configured such that the pitch of the cut changes in magnitude, at both ends of the segment, by 0.2 mm/rotation or less.

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

4. The system of claim 2, wherein the segment is located 20 cm or more from an endpoint of the cut.

5. The system of claim 2, wherein the length of the first segment is about 5 mm or less.

6. The system of claim 2, wherein the pitch of the cut changes in magnitude at both ends of the segment, by 0.1 mm/rotation or less.

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

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

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

10. The system of claim 1, wherein the tube has a wall thickness of 0.010″

or less.

11. 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.

12. 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.

13. The core member of claim 12, wherein a pitch of the helical void varies along the length of the core member.

14. The core member of claim 13, wherein a segment of the void is configured such that the pitch of the void changes in magnitude, at both ends of the segment, by 0.2 mm/rotation or less.

15. The core member of claim 14, wherein the length of the first segment is about5 mm or less.

16. The core member of claim 14, wherein the pitch of the void changes in magnitude at both ends of the segment, by 0.1 mm/rotation or less.

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

18. The core member of claim 14, wherein the length of the segment is about 3 mm or less.

19. The core member of claim 14, wherein the length of the segment is about 2 mm or less.

20. The core member of claim 14, wherein the length of the segment is about 1.0 mm.

21. The core member of claim 14, wherein the segment is located 10 cm or more from an endpoint of the void.

22. The core member of claim 14, wherein the segment is located 20 cm or more from an endpoint of the void.

23. The core member of claim 14, wherein the segment is located 30 cm or more from an endpoint of the void.

24. The core member of claim 14, 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.

25. The core member of claim 14, 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.

26. The core member of claim 14, 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.

27. The core member of claim 12, wherein each of the plurality of slots has an axial length of less than or equal to about 15 cm.

28. A medical device comprising the core member of claim 12 and a stent that is longitudinally movable by the core member.

29. The device of claim 28, wherein the wherein the stent is a braided stent.

30. The device of claim 28, wherein the wherein the stent is a laser-cut stent.

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