Selective coating of a balloon catheter with lubricious material for stent deployment

• US 20030125664A1
• Filed: 10/01/2002
• Published: 07/03/2003
• Est. Priority Date: 03/24/1995
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Inventors: Madenjian, Arthur R., Sydney, Gregory T., Seiber, Russ, Belovi, Annette
• Granted Patent: US 6,890,348 B2
• Time in Patent Office: Days
• US Class Current: 604/104
• CPC Class Codes: A61F 2/958 Inflatable balloons for placing stents or stent-grafts
• CPC Class Codes: A61F 2002/9583 Means for holding the stent on the balloon, e.g. using protrusions, adhesives or an outer sleeve

Abstract

A predetermined arrangement of differentially lubricious areas on a balloon catheter for controlling against unexpected movement of a stent carried thereon when in situ in the body.

Claims

1. A balloon catheter having a shaft and a balloon associated therewith and a stent carried on said balloon, the balloon having a proximal end portion, a distal end portion and a central portion, the improvement comprising a lubricious coating means associated with the catheter, said means being constructed and arranged to provide relatively more lubricity with respect to a major portion of the shaft than with respect to at least a portion of the balloon, whereby said stent is provided with a secure seating area on the balloon.

2. The catheter according to the claim 1 wherein the lubricious coating means is constructed and arranged to provide a lubricious coating on the shaft portion and wherein at least a portion of the balloon is uncoated.

3. The catheter according to claim 2 wherein the central portion of the balloon is uncoated.

4. The catheter according to claim 2, wherein the proximal end portion of the balloon is uncoated.

5. The catheter according to claim 2, wherein the distal end portion of the balloon is uncoated.

6. The catheter according to claim 2, wherein the distal and the proximal end portions of the balloon are uncoated.

7. The catheter according to claim 1, wherein the lubricious coating means is constructed and arranged to provide a more lubricious coating on the shaft and a relatively less lubricious coating on at least a portion of the balloon.

8. The catheter according to claim 7 wherein the more lubricious coating comprises a polyethylene oxide composition.

9. The catheter according to claim 7 wherein the less lubricious coating comprises silicone.

10. The catheter according to claim 7 wherein the less lubricious coating is only on a central portion of the balloon.

11. In a stent carrying balloon catheter of the type including a shaft, a balloon having a cone and a waist at each end, a distal tip portion, a stent positioned on the balloon and a lubricious coating associated with surfaces of the catheter, the improvement comprising a predetermined arrangement of relatively more lubricious and less lubricious coatings on surface areas of the catheter whereby the shaft is provided with a relatively more lubricious coating over a substantial portion of its length extending from the balloon toward the proximal end of the shaft, both cones of the balloon are similarly coated as the shaft, as is the distal tip while at least a substantial portion of the balloon body per se is coated with a relatively less lubricious coating.

12. The catheter according to claim 11 wherein the more lubricious coating is comprised of a polyethylene oxide composition.

13. The catheter according to claim 11 wherein the less lubricious coating is comprised of silicone.

14. The catheter according to claim 11, wherein the entire balloon body is coated with the less lubricious coating.

15. The catheter according to claim 11, wherein the central portion of the balloon body is uncoated, as defined by the balloon material forming the outer surface thereof.

16. The catheter according to claim 11, wherein only the central portion of the balloon body is coated with the less lubricious coating.

17. In a balloon catheter of the type including a shaft and a balloon associated therewith, the balloon having a proximal end portion, a distal end portion and a central portion, the improvement comprising including a first lubricious hydrophilic coating means bonded to said balloon catheter, said lubricious means being constructed and arranged to provide relatively more lubricity with respect to a major portion of the shaft than with respect to at least a portion of the balloon.

18. The catheter of claim 17, wherein both ends of the balloon are coated with the lubricious coating.

19. The catheter of claim 17, wherein the entire central portion of the balloon is uncoated with the lubricious coating.

20. The catheter of claim 17, the balloon having a collapsed state in which a surface is exposed and an expanded state wherein the balloon is at least partially coated with a tacky coating, such that a stent may be securely held in place on the balloon during location of the stent at a targeted area of a vessel, after which the stent may be released by expanding the balloon, wherein the tacky coating has a higher coefficient of friction than the lubricious coating.

21. The catheter of claim 20, wherein the tacky coating comprises a water-based dispersion based on high-molecular weight ethylene interpolymers.

22. The catheter of claim 20, wherein the tacky coating comprises an aqueous dispersion of ethylene vinyl acetate.

23. The catheter of claim 21, wherein the entire balloon is coated with the tacky coating, wherein the tacky coating has a static coefficient of friction of about 0.2-0.4.

24. The catheter of claim 22, wherein the entire balloon is coated with the tacky coating, wherein the tacky coating has a static coefficient of friction of about 0.2-0.4.