Superelastic coiled stent

• US 20040260384A1
• Filed: 06/17/2003
• Published: 12/23/2004
• Est. Priority Date: 06/17/2003
• Status: Abandoned Application

• Current Assignee: Medtronic Ave
• Original Assignee: Medtronic Ave
• Inventors: Allen, Jeffrey W.
• Application Number:
  US10/463,124
• Publication Number:
  US 20040260384A1
• Time in Patent Office: Days
• US Class Current: 623/1.12
• CPC Class Codes: A61F 2/0077 Special surfaces of prostheses, e.g. for improving ingrowth A61F2/30767 takes precedence
• CPC Class Codes: A61F 2/88 the wire-like elements formed as helical or spiral coils forming a net-like or mesh-like structure A61F2/90
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of stents or stent-grafts
• CPC Class Codes: A61F 2002/30322 differing in surface structures
• CPC Class Codes: A61F 2250/0026 differing in surface structures
• CPC Class Codes: A61F 2250/0039 differing in diameter
• CPC Class Codes: A61F 2250/0067 Means for introducing or releasing pharmaceutical products into the body

Abstract

The present invention provides a system for treating an aneurysm, including a catheter with a stent-receiving tube and a coiled stent axially received in the stent-receiving tube, wherein the coiled stent is delivered to the aneurysm through a vessel via the catheter. The present invention also provides a coiled stent and a method of treating an intracranial aneurysm.

Claims

1. A system for treating an aneurysm, comprising:

a catheter including a stent-receiving tube; and

a coiled stent axially received in the stent-receiving tube, wherein the coiled stent is delivered to the aneurysm through a vessel via the catheter.

2. The system of claim 1 wherein the catheter includes a delivery sheath that retracts to deploy the stent.

3. The system of claim 1 wherein the catheter includes a thin-walled tube with an inner diameter sized to contain the axially-received coiled stent.

4. The system of claim 1 wherein the coiled stent forms a helical spring when the coiled stent is deployed at the aneurysm.

5. The system of claim 1 wherein the coiled stent forms a helical spring with at least one taper or undulation along an axial length of the helical spring when the coiled stent is deployed at the aneurysm.

6. The system of claim 1 wherein the coiled stent comprises a metallic base.

7. The system of claim 6 wherein the metallic base comprises a superelastic metal selected from the group consisting of nitinol, a nickel-tin alloy and a shape-memory material.

8. The system of claim 6 wherein the metallic base comprises a material selected from the group consisting of stainless steel, tantalum, MP35N alloy, platinum, titanium, a chromium-based alloy, a suitable biocompatible alloy, a suitable biocompatible polymer, and a combination thereof.

9. The system of claim 1 further comprising:

a push wire for moving the axially-received coiled stent through the stent-receiving tube and deploying the coiled stent adjacent to the aneurysm.

10. The system of claim 1 further comprising:

a polymeric coating circumferentially disposed on at least a portion of the coiled stent.

11. The system of claim 10 wherein the disposed polymeric coating forms a continuous web along at least a portion of the coiled stent when the coiled stent is deployed.

12. The system of claim 10 wherein the disposed polymeric coating comprises a drug polymer.

13. The system of claim 10 further comprising:

an adhesion layer positioned between the disposed polymeric coating and a metallic base of the coiled stent.

14. A coiled stent for treating an aneurysm, comprising:

a coiled stent framework, the coiled stent framework coaxially located within a stent-receiving tube when axially elongated within the stent-receiving tube, and recoiled when delivered from the stent-receiving tube and deployed adjacent to the aneurysm.

15. The coiled stent of claim 14 wherein the coiled stent forms a helical spring when the coiled stent is deployed at the aneurysm.

16. The coiled stent of claim 14 wherein the coiled stent forms a helical spring with at least one taper or undulation along an axial length of the helical spring when the coiled stent is deployed at the aneurysm.

17. The coiled stent of claim 14 wherein the coiled stent comprises a metallic base.

18. The coiled stent of claim 17 wherein the metallic base comprises a superelastic metal selected from the group consisting of nitinol, a nickel-tin alloy and a shape-memory material.

19. The coiled stent of claim 17 wherein the metallic base comprises a material selected from the group consisting of stainless steel, tantalum, MP35N alloy, platinum, titanium, a chromium-based alloy, a suitable biocompatible alloy, a suitable biocompatible polymer, and a combination thereof.

20. The coiled stent of claim 14 further comprising:

a polymeric coating circumferentially disposed on at least a portion of the coiled stent.

21. The coiled stent of claim 20 wherein the disposed polymer coating forms a continuous web along at least a portion of the coiled stent when the coiled stent is deployed.

22. The coiled stent of claim 20 wherein the disposed polymeric coating comprises a drug polymer.

23. The coiled stent of claim 14 further comprising:

an adhesion layer positioned between the disposed polymeric coating and a metallic base of the coiled stent.

24. A method of treating an intracranial aneurysm, comprising:

inserting a catheter including an axially-received coiled stent into a vessel in a body;

positioning the axially-received coiled stent adjacent to the intracranial aneurysm;

separating the axially-received coiled stent from the catheter; and

recoiling the axially-received coiled stent;

wherein at least a portion of the recoiled stent occludes an aneurysmal neck of the intracranial aneurysm when the coiled stent is deployed.

25. The system of claim 24 wherein the aneurysm comprises an axial aneurysm, a lateral aneurysm, or a saccular aneurysm.

26. The system of claim 24 wherein the vessel is located in an intracranial vasculature of the body.

27. The method of claim 24 further comprising:

delivering a therapeutic compound to the intracranial vessel or the intracranial aneurysm with a polymeric coating circumferentially disposed on at least a portion of the coiled stent when the coiled stent is deployed, the polymeric coating including at least one therapeutic compound.