Methods and apparatus for luminal stenting

• US 9,463,105 B2
• Filed: 03/14/2013
• Issued: 10/11/2016
• Est. Priority Date: 03/14/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Farhat, Lawrence, Wang, Edwin, Franco, David
• Primary Examiner(s): LYNCH, ROBERT A
• Application Number:
  US13/826,298
• Publication Number:
  US 20140277361A1
• Time in Patent Office: 1,307 Days
• US Class Current: 1/1
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• 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 2002/9528 for retrieval of stents
• CPC Class Codes: A61F 2002/9534 for repositioning of stents
• CPC Class Codes: A61F 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve
• CPC Class Codes: A61F 2002/9665 with additional retaining means
• CPC Class Codes: A61M 2025/1093 having particular tip characteristics
• CPC Class Codes: A61M 25/10 Balloon catheters A61M25/0125 takes precedence; embolectomy A61B17/22032; retractors A61B17/02; inflatable balloons for placing stents or stent-grafts A61F2/958 ; stomach balloons for treatment of obesity A61F5/0003; oesophagal tubes A61J15/00

Abstract

Stent delivery systems and methods of use are provided. The systems can include a catheter, a core member, and engagement member, and a stent. The catheter can have a inner wall. The core member can extend within the catheter and having a distal segment. The engagement member can be attached to the distal segment. Further, the stent can be positioned within the catheter and extend over the engagement member. The stent can have an axial length that is greater than an axial length of the engagement member. The engagement member can have an expanded state in which the engagement member presses the stent against the catheter inner wall for engaging the stent to move the stent along with the core member relative to the catheter.

Claims

1. A stent delivery system, comprising:

a catheter having an inner wall that defines a lumen;

a core member extending within the catheter, the core member having a distal segment;

a self-expanding stent having a length and extending along the core member distal segment radially positioned between the core member and the catheter inner wall;

an expandable engagement member attached to the core member and extending distally beyond the distal segment of the core member, the engagement member being positioned radially between the core member and the stent and having a length less than 60% of the stent length, the engagement member having (i) an advancement configuration in which the engagement member is expanded within the catheter to press the stent against the catheter inner wall and transmit axial movement of the core member to the stent for moving the stent within the catheter lumen relative to the catheter and (ii) an expansion configuration in which the engagement member extends distally beyond the catheter lumen and expands to a diameter greater than a diameter of the lumen to urge the stent to a fully expanded state;

wherein the engagement member comprises first and second end portions, the first end portion coupled to the core member, the second end portion positioned distal to and longitudinally spaced apart from a distal end of the core member to permit the second end portion to move freely relative to the core member.

2. The system of claim 1, wherein the engagement member comprises at least one balloon.

3. The system of claim 2, wherein the at least one balloon comprises a material having a durometer of from about Shore 5A to about Shore 60A.

4. The system of claim 3, wherein the at least one balloon comprises a material having a durometer of from about Shore 15A to about Shore 50A.

5. The system of claim 3, wherein the at least one balloon comprises a material having a durometer of from about Shore 20A to about Shore 40A.

6. The system of claim 1, wherein the engagement member length is less than about 40% of the stent length.

7. The system of claim 1, further comprising a distal structure extending distally from the core member distal segment and interposed between an outer surface of the stent and the catheter inner wall.

8. The system of claim 7, wherein the distal structure comprises a coil.

9. The system of claim 1, wherein the engagement member length is less than 40% of the stent length.

10. The system of claim 1, wherein the engagement member length is less than 20% of the stent length.

11. A stent delivery system, comprising:

a catheter having a lumen defined by a catheter inner wall;

a core member extending within the catheter and having a distal segment;

a balloon attached to the distal segment and extending distally beyond the distal segment; and

a self-expanding stent positioned within the catheter and extending over the balloon, the stent having an axial length that is greater than an axial length of the balloon;

wherein the balloon has a length less than 60% of the stent length, the balloon having (i) a collapsed state, (ii) a first expanded state, in which the balloon presses the stent against the catheter inner wall for frictionally engaging the stent with the balloon to move the stent within the catheter lumen as the core member moves relative to the catheter and (iii) a second expanded state, in which the balloon extends distally beyond the catheter lumen and expands to a diameter greater than a diameter of the lumen to urge the stent to a fully expanded state; and

wherein the engagement member comprises first and second end portions, the first end portion coupled to the core member, the second end portion positioned distal to and longitudinally spaced apart from a distal end of the core member to permit the second end portion to move freely relative to the core member.

12. The system of claim 11, wherein the system comprises a plurality of balloons attached to the distal segment.

13. The system of claim 11, wherein the balloon length is less than 40% of the stent length.

14. The system of claim 11, wherein the balloon length is less than 20% of the stent length.