Delivery of medical devices

• US 10,045,867 B2
• Filed: 09/27/2013
• Issued: 08/14/2018
• Est. Priority Date: 08/27/2013
• Status: Active Grant

• Current Assignee: Covidien LP (Medtronic Plc)
• Original Assignee: Covidien LP (Medtronic Plc)
• Inventors: Nageswaran, Ashok, Losordo, Michael, Newell, Gabriel, Farhat, Lawrence
• Primary Examiner(s): Stransky, Katrina
• Assistant Examiner(s): Rwego, Kankindi
• Application Number:
  US14/040,489
• Publication Number:
  US 20150066129A1
• Time in Patent Office: 1,782 Days
• 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 a core member, a stent engagement member, and a stent. The core member can have a distal segment. The stent engagement member can have a generally tubular body positioned about the core member distal segment and can be rotatably coupled to the core member. The engagement member can include an inner layer that has a first durometer and an outer layer that has a second durometer less than the first durometer. The stent can extend along the core member distal segment such that an inner surface of the stent is engaged by the engagement member outer layer for facilitating rotation of the stent relative to the core member.

Claims

1. A stent delivery system, comprising:

a core member having a distal segment;

a stent engagement member having a generally tubular body positioned about the core member distal segment and rotatably coupled to the core member, the engagement member comprising an inner layer having a first durometer and an outer layer comprising silicone and having a second durometer less than the first durometer, the outer layer defining a cylindrical smooth outer surface; and

a stent extending along the core member distal segment such that an inner surface of the stent is engaged by the engagement member outer layer for facilitating rotation of the stent relative to the core member,

wherein the stent engagement member has a length of less than 5 mm.

2. The system of claim 1, wherein the inner layer comprises a substantially cylindrical inner surface surrounding the core member.

3. The system of claim 1, wherein the inner layer comprises polyimide.

4. The system of claim 1, wherein the stent is a self-expanding stent.

5. The system of claim 1, wherein the stent is moveable within a tubular component by virtue of engagement with the engagement member.

6. The system of claim 1, wherein the outer layer comprises a durometer of between about 10 A to about 50 A.

7. The system of claim 6, wherein the outer layer comprises a durometer of between about 15 A to about 40 A.

8. The system of claim 7, wherein the outer layer comprises a durometer of about 20 A.

9. The system of claim 1, further comprising a sheath having a lumen configured to receive the core member, engagement member, and stent, wherein the stent is radially compressed between an inner surface of the sheath and the engagement member outer layer.

10. The system of claim 9, wherein friction between the engagement member and the stent is greater than friction between the sheath inner surface and the stent.

15. The system of claim 1, wherein the outer layer has a durometer of less than 50 A.

11. A stent delivery system, comprising:

a core member having a distal segment;

a stent engagement member positioned about the core member distal segment and rotatably coupled to the core member, the engagement member comprising an inner layer and an outer layer, the outer layer comprising silicone and having a durometer of less than 50 A, and the outer layer defining a cylindrical smooth outer surface; and

a stent extending along the core member distal segment such that an inner surface of the stent is engaged by the engagement member outer layer for facilitating rotation of the stent relative to the core member,

wherein the stent engagement member has a length less of than 5.0 mm.

12. The system of claim 11, wherein the inner layer comprises a substantially cylindrical inner surface surrounding the core member.

13. The system of claim 11, wherein the inner layer comprises a durometer of between about 70 A to about 100 A.

14. The system of claim 11, wherein the inner layer comprises polyimide.

16. The system of claim 11, wherein the outer layer comprises a durometer of between about 10 A to about 50 A.

17. The system of claim 16, wherein the outer layer comprises a durometer of between about 15 A to about 40 A.

18. The system of claim 17, wherein the outer layer comprises a durometer of about 20 A.