Radially crush-resistant stent

• US 20050203605A1
• Filed: 03/15/2005
• Published: 09/15/2005
• Est. Priority Date: 03/15/2004
• Status: Abandoned Application

• Current Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Original Assignee: Medtronic Vascular, Inc. (Medtronic Plc)
• Inventors: Dolan, Mark Jeffrey
• Application Number:
  US11/079,956
• Publication Number:
  US 20050203605A1
• Time in Patent Office: Days
• US Class Current: 623/1.110
• CPC Class Codes: A61F 2/2418 Scaffolds therefor, e.g. support stents
• CPC Class Codes: A61F 2/91 made from perforated sheet material or tubes, e.g. perforated by laser cuts or etched holes
• CPC Class Codes: A61F 2/915 with bands having a meander structure, adjacent bands being connected to each other
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/91525 within the whole structure different bands showing different meander characteristics, e.g. frequency or amplitude
• CPC Class Codes: A61F 2002/91533 characterised by the phase between adjacent bands
• CPC Class Codes: A61F 2002/91558 connected peak to peak
• CPC Class Codes: A61F 2230/0054 V-shaped
• CPC Class Codes: A61F 2250/0018 differing in elasticity, stiffness or compressibility

Abstract

A system for treating a vascular condition includes a catheter and a stent coupled to the catheter. The stent includes a stent framework having at least one stent segment with a plurality of interconnected struts and crowns and at least one stiffening ring having a plurality of ring segments connected between circumferentially adjacent crowns of the stent segment. The stiffening ring is oriented circumferentially about a longitudinal axis of the stent framework when the stent is deployed. A stent and a method of treating a vascular condition are also disclosed.

Claims

1. A system for treating a vascular condition, the system comprising:

a catheter; and

a stent coupled to the catheter, the stent including a stent framework having at least one stent segment with a plurality of interconnected struts and crowns and at least one stiffening ring having a plurality of ring segments connected between circumferentially adjacent crowns of the stent segment,

wherein the stiffening ring is oriented circumferentially about a longitudinal axis of the stent framework when the stent is deployed.

2. The system of claim 1, wherein the stiffening ring minimizes overexpansion of the stent framework when the stent is deployed.

3. The system of claim 1, wherein the stiffening ring reduces deployment recoil.

4. The system of claim 1, wherein the catheter includes an inflatable balloon used to expand the stent.

5. The system of claim 1, wherein the catheter includes a sheath that retracts to allow expansion of the stent.

6. The system of claim 1, wherein the stent framework includes at least one end segment having a stiffening ring.

7. The system of claim 1, wherein the stent framework includes at least one end segment having no stiffening ring.

8. The system of claim 1, wherein the stent framework comprises one of a metallic base or a polymeric base.

9. The system of claim 8, wherein the metallic base is selected from the group consisting of stainless steel, nitinol, tantalum, MP35N alloy, a cobalt-based alloy, platinum, titanium, a suitable biocompatible alloy, a suitable biocompatible material, and a combination thereof.

10. The system of claim 1, wherein the stent framework is cut from a tube.

11. The system of claim 1, wherein the crowns of the at least one stent segment are connected to corresponding crowns of an adjacent stent segment with a welded joint.

12. The system of claim 1, wherein the crowns of the at least one stent segment are connected to corresponding crowns of an adjacent stent segment with a molded joint.

13. The system of claim 1, wherein the stent is selected from the group consisting of a cardiovascular stent, a peripheral stent, an abdominal aortic aneurysm stent, a cerebral stent, a carotid stent, an endovascular stent, an aortic valve stent, and a pulmonary valve stent.

14. The system of claim 1, wherein the stent framework has a drug-polymer coating disposed thereon.

15. The system of claim 1 further comprising:

a bioprosthetic valve attached to the stent framework and positioned within a central lumen of the stent framework.

16. The system of claim 15, wherein the bioprosthetic valve comprises a bovine jugular valve.

17. A stent comprising:

a stent framework having at least one stent segment with a plurality of interconnected struts and crowns and at least one stiffening ring having a plurality of ring segments connected between circumferentially adjacent crowns of the stent segment,

wherein the stiffening ring is oriented circumferentially about a longitudinal axis of the stent framework when the stent is deployed.

18. The stent of claim 17, wherein the stent framework has a drug-polymer coating disposed thereon.

19. The stent of claim 17 further comprising:

a bioprosthetic valve attached to the stent framework and positioned within a central lumen of the stent framework.

20. A method of treating a vascular condition, the method comprising:

delivering a stent having a bioprosthetic valve to a targeted region via a catheter;

expanding the stent to deploy the bioprosthetic valve; and

forming at least one stiffening ring of the stent as the stent is expanded.

21. The method of claim 20, wherein forming the at least one stiffening ring as the stent is expanded comprises substantially straightening a plurality of ring segments connected between circumferentially adjacent crowns of the stent, the stiffening ring oriented circumferentially about a longitudinal axis of the stent.