Delivery of medical devices

Patent metadata

Field	Value
Publication number	US-9474639-B2
Application number	US-201314040510-A
Country	US
Kind code	B2
Filing date	Sep 27, 2013
Priority date	Aug 27, 2013
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A stent delivery system can include a core member, an introducer sheath, and a microcatheter. The core member can have a first section and a second section distal to the first section. The second section can have a bending stiffness per unit length that is less than a bending stiffness per unit length of the first section. The introducer sheath can have a lumen configured to receive the core member therethrough. The introducer sheath can have a length of at least about 80 cm. The microcatheter can have a lumen and a proximal end configured to interface with a distal end of the introducer sheath for delivering the core member into the microcatheter lumen.

First claim

What is claimed is:

1. A stent delivery system, comprising:
a core member having a first section and a second section distal to the first section, the second section having a bending stiffness per unit length that is less than a bending stiffness per unit length of the first section;
an introducer sheath having a lumen configured to receive the core member therethrough, the introducer sheath having a length of at least about 80 cm; and
a microcatheter having a lumen and a proximal end, the proximal end comprising a hub configured to be connected to a distal end of the introducer sheath for transitioning the core member and an implant disposed within the introducer sheath out of a distal end of the introducer sheath and into the proximal end of the microcatheter;
wherein after the implant is transitioned into the microcatheter, the introducer sheath is detachable from the hub while the microcatheter remains within a patient.

2. The system of claim 1 , wherein the sheath length is equal to or greater than a length of the core member second section.

3. The system of claim 1 , wherein the first section has a substantially constant bending stiffness per unit length.

4. The system of claim 1 , wherein the sheath length is between about 80 cm and about 150 cm.

5. The system of claim 4 , wherein the sheath length is about 106 cm.

6. The system of claim 1 , wherein the core member comprises a marker visible through the introducer sheath.

7. The system of claim 6 , wherein the marker is disposed along the core member in the first section thereof.

8. The system of claim 6 , wherein the introducer sheath comprises titanium dioxide.

9. The system of claim 1 , wherein the core member comprises a solid wire in the first section.

10. The system of claim 1 , wherein the core member comprises a hollow tubular member in the second section.

11. The system of claim 10 , wherein at least a portion of the hollow tubular member comprises a spiral cut.

12. The system of claim 11 , wherein the spiral cut extends along about 60 cm to about 100 cm of a length of the second section.

13. The system of claim 12 , wherein the spiral cut extends along about 86 cm of the length of the second section.

14. The system of claim 1 , wherein the microcatheter lumen has an inner diameter about equal to an inner diameter of the sheath lumen.

15. A stent delivery system, comprising:
a core member having (i) a stiff section having a first bending stiffness and (ii) a soft section having a second bending stiffness that is less than the first bending stiffness, the second bending stiffness varying spatially along the soft section;
an introducer sheath covering any portion of the core member having a bending stiffness that is less than the first bending stiffness, the introducer sheath having a length of at least about 80 cm; and
a microcatheter having a lumen and a proximal end, the proximal end comprising a hub configured to connect a distal end of the introducer sheath to the microcatheter proximal end for transitioning the core member and an implant disposed in the introducer sheath out of a distal end of the introducer sheath and into the proximal end of the microcatheter;
wherein after the implant is transitioned into the microcatheter, the introducer sheath is detachable from the hub while the microcatheter remains within a patient.

16. The system of claim 15 , wherein the bending stiffness of the stiff section is substantially constant.

17. The system of claim 15 , wherein the stiff section is proximal to the soft section.

18. The system of claim 15 , wherein the sheath length is between about 80 cm and about 150 cm.

19. The system of claim 18 , wherein the sheath length is about 106 cm.

20. The system of claim 15 , wherein the microcatheter lumen has an inner diameter about equal to an inner diameter of a lumen of the introducer sheath.

21. The system of claim 15 , wherein the hub connects a distal end of the introducer sheath to the microcatheter proximal end in an end-to-end manner.

Assignees

• Covidien Lp

Inventors

• Haggstrom Kurt
• Losordo Michael L
• Brown Kenneth

Classifications

• A61F2002/9505

  having retaining means other than an outer sleeve, e.g. male-female connector between stent and instrument · CPC title

• A61F2002/823

  Stents, different from stent-grafts, adapted to cover an aneurysm · CPC title

• A61F2230/0091

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

• A61F2/95 Primary

  Instruments specially adapted for placement or removal of stents or stent-grafts · CPC title

• A61F2/90

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