Skids stent delivery system

• US 20030009174A1
• Filed: 07/09/2001
• Published: 01/09/2003
• Est. Priority Date: 07/09/2001
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Smith, Scott R.
• Granted Patent: US 6,645,238 B2
• Time in Patent Office: Days
• US Class Current: 606/108
• CPC Class Codes: A61F 2/95 Instruments specially adapted for placement or removal of 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

Abstract

A medical device delivery catheter comprises an inner member and a retractable sheath assembly disposed about the inner member. The retractable sheath assembly comprises a retractable sheath and one or more skids extending from the retractable sheath. The skids are disposed between the retractable sheath and the inner member.

Claims

1. A medical device delivery catheter comprising an inner member and a retractable sheath assembly disposed about the inner member, the retractable sheath assembly comprising a retractable sheath and one or more skids extending from the retractable sheath, the skids disposed between the retractable sheath and the inner member.

2. The medical device delivery catheter of claim 1 comprising a plurality of skids, each skid comprising an outer layer of a first skid material and an inner layer of a second skid material different from the first material, the inner layer facing the inner member.

3. The medical device delivery catheter of claim 2 further comprising a stent disposed about the inner member, the retractable sheath assembly disposed about the stent.

4. The medical device delivery catheter of claim 3 wherein the retractable sheath assembly is constructed and arranged such that the skids are disposed between the retractable sheath and the inner member prior to, during and subsequent to retraction of the retractable sheath assembly.

5. The medical device delivery catheter of claim 4 wherein the first skid material is harder than the second material.

6. The medical device delivery catheter of claim 4 wherein the second skid material has a lower coefficient of friction on steel than the first skid material.

7. The medical device delivery catheter of claim 4 wherein the first skid material is harder than the second skid material and the second skid material is more slippery than the first skid material.

8. The medical device delivery catheter of claim 4 wherein the first skid material is polyimide and the second skid material is PTFE.

9. The medical device delivery catheter of claim 4 comprising a plurality of skids, skids which are adjacent one another spaced from one another.

10. A medical device delivery catheter comprising an inner member and a retractable sheath assembly, the retractable sheath assembly having a thickness of no more than 0.002 inches.

11. The medical device delivery catheter of claim 10 wherein the retractable sheath assembly comprises a retractable sheath and one or more skids attached to the retractable sheath, the one or more skids disposed between the retractable sheath and the inner member.

12. The medical device delivery system of claim 11 further comprising a stent disposed about the inner member, the retractable sheath assembly disposed about the stent.

13. The medical device delivery system of claim 12 comprising a plurality of skids, each skid having an outer layer of a first skid material and an inner layer of a second skid material, the first skid material harder than the second skid material.

14. The medical device delivery system of claim 13 wherein the second skid material is more slippery than the first skid material.

15. The medical device delivery system of claim 10 comprising a plurality of skids.

17. The medical device delivery catheter of claim 16 wherein the retractable sheath assembly comprises a skid, the skid having an outer layer of a first skid material having a shore D hardness of at least 84.

18. The medical device delivery catheter of claim 17 wherein the skid includes an inner layer of a second skid material, the skid disposed between the outer layer and the inner member.

19. The medical device delivery catheter of claim 18 wherein the retractable sheath assembly further comprises a sheath disposed about the skids, the sheath attached to the skids.

20. The medical device delivery catheter of claim 19 further comprising a stent disposed about the inner member, the retractable sheath assembly disposed about the stent.

21. The medical device delivery catheter of claim 20 wherein the stent is self-expanding.

16. A medical device delivery catheter comprising an inner member and a retractable sheath assembly disposed about the inner member, the retractable sheath assembly having a bending flexibility of at least 1.17 GPa.