Methods and apparatus for luminal stenting

• US 9,901,472 B2
• Filed: 03/17/2016
• Issued: 02/27/2018
• Est. Priority Date: 01/17/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Newell, Gabriel, Huynh, Andy, Farhat, Lawrence
• Primary Examiner(s): Nguyen, Tuan V
• Assistant Examiner(s): IGBOKO, CHIMA U
• Application Number:
  US15/073,079
• Publication Number:
  US 20160193061A1
• Time in Patent Office: 712 Days
• CPC Class Codes: A61B 2017/1205 Introduction devices
• CPC Class Codes: A61F 2/844 folded prior to deployment
• 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 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61F 2210/0014 using shape memory or superelastic materials, e.g. nitinol

Abstract

A stent delivery system can include a core wire and a self-expanding member disposed along the core wire. The self-expanding member can be used to facilitate expansion of a stent or other implantable device within the vasculature of a patient. The self-expanding member can include first and second end portions that are each axially slidable along the core wire and be able to expand from a collapsed configuration to an expanded configuration upon axial convergence of the first and second end portions.

Claims

1. A stent delivery system, comprising:

an elongate body having a lumen extending from a proximal portion to a distal portion of the body, the distal portion being configured to extend within a blood vessel;

a stent expandable from a compressed configuration, sized to be received within the elongate body lumen, to an expanded configuration, the stent having a lumen and an inner surface extending from a proximal end to a distal end of the stent;

a core wire configured to extend through the elongate body lumen and the stent lumen and having a distal region;

a distal stent cover extending proximally from the distal region of the core wire and interposed between an outer surface of the stent and an inner surface of the elongate body;

a self-expanding member disposed along the core wire distal region, the self-expanding member comprising first and second end portions, the first and second end portions each comprising lumens through which the core wire passes to enable the self-expanding member to be rotatably and slidably movable relative to the core wire, the self-expanding member being configured to facilitate the expansion of at least a portion of the stent to the expanded configuration by expanding and engaging the stent inner surface; and

a fixed blocking member fixed to the core wire between the first and second end portions of the self-expanding member, the fixed blocking member having an outer cross-sectional profile greater than inner cross-sectional profiles of the apertures of the first and second end portions of the self-expanding member to limit axial movement of the first and second end portions along the core member upon contact with the fixed blocking member.

2. The system of claim 1, further comprising a movable blocking member being slidable along the core wire relative to the fixed blocking member, the fixed blocking member defining an outer cross-sectional profile that is sized greater than an inner cross-sectional profile of a lumen of the movable blocking member, the movable blocking member defining an outer cross-sectional profile that is sized greater than an inner cross-sectional profile of a lumen of the first end portion of the self-expanding member, the movable blocking member being disposed between the first end portion of the self-expanding member and the fixed blocking member, such that the first end portion of the self-expanding member is blocked from sliding past the movable blocking member and the fixed blocking member.

3. The system of claim 1, further comprising a movable blocking member.

4. The system of claim 1, further comprising a second fixed blocking member and a movable blocking member.

5. The system of claim 1, wherein the self-expanding member comprises a plurality of filaments.

6. The system of claim 1, wherein the self-expanding member comprises a shape memory material.

7. The system of claim 1, wherein the self-expanding member self-expands when radially unrestrained by the elongate body.

8. The system of claim 1, wherein the distal stent cover comprises a folded region having (a) an outer layer configured to be urged against the inner surface of the elongate body and (b) an inner layer configured to contact the outer surface of the stent.

9. The system of claim 8, wherein the folded region is an inverted section of the distal stent cover where the distal stent cover folds within itself.

10. The system of claim 1, wherein the distal stent cover is coupled to the core wire.

11. The system of claim 1, wherein the distal stent cover is formed by one or more flaps of material.

12. The system of claim 1, wherein the distal stent cover comprises a lubricious material.

13. A stent delivery system, comprising:

a core wire having a distal region;

a distal stent cover extending proximally from the distal region of the core wire, the distal stent cover configured to be disposed over an outer surface of a stent;

a self-expanding member disposed along the core wire distal region, the self-expanding member comprising first and second end portions that are each axially slidable along the core wire, wherein the self-expanding member can expand from a collapsed configuration to an expanded configuration upon axial convergence of the first and second end portions;

a fixed blocking member coupled to the core wire between the first and second end portions of the self-expanding member, the fixed blocking member limiting axial movement of the self-expanding member along the core member upon contact with the fixed blocking member; and

an elongate body having proximal and distal portions and a lumen extending between the proximal and distal portions, wherein the core wire extends within the elongate body lumen.

14. The system of claim 13, wherein the blocking member limits axial movement of both the first and second end portions along the core member.

15. The system of claim 13, further comprising a movable blocking member being slidable along the core wire relative to the fixed blocking member.

16. The system of claim 15, wherein the movable blocking member comprises a lumen having an inner cross-sectional profile that is sized less than an outer cross-sectional profile of the fixed blocking member, the fixed blocking member limiting movement of the movable blocking member along the core wire.

17. The system of claim 16, wherein the first and second end portions each comprise a lumen, wherein the first end portion lumen has a first inner cross-sectional profile greater than a second inner cross-sectional profile of the second end portion lumen and the outer cross-sectional profile of the fixed blocking member, and wherein the movable blocking member comprises an outer cross sectional profile greater than the first inner cross-sectional profile to limit movement of the first end portion relative to the fixed blocking member.

18. The system of claim 13, wherein the first and second end portions each comprise a lumen, wherein the first end portion lumen has a first inner cross-sectional profile greater than a second inner cross-sectional profile of the second end portion lumen and an outer cross-sectional profile of the fixed blocking member.