Stent delivery system with stent securement means

• US 6,007,543 A
• Filed: 08/23/1996
• Issued: 12/28/1999
• Est. Priority Date: 08/23/1996
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Dusbabek, Andrew J., Larson, Christopher R., Ellis, Louis G., Brown, Terry V.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): YU, JUSTINE ROMANG
• Application Number:
  US08/702,150
• Time in Patent Office: 1,222 Days
• Field of Search: 606/108, 606/194, 606/195, 606/198, 604/96
• US Class Current: 606/108
• CPC Class Codes: A61F 2/9522 Means for mounting a stent or stent-graft onto or into a placement instrument
• 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
• CPC Class Codes: A61F 2002/9586 the means being inside the balloon
• CPC Class Codes: A61L 29/04 Macromolecular materials
• CPC Class Codes: A61M 2025/1013 with concentrically mounted balloons, e.g. being independently inflatable
• CPC Class Codes: A61M 2025/1063 having only one lumen used for guide wire and inflation, e.g. to minimise the diameter
• CPC Class Codes: A61M 2025/1079 having radio-opaque markers in the region of the balloon
• CPC Class Codes: A61M 2025/1093 having particular tip characteristics
• CPC Class Codes: A61M 25/1011 Multiple balloon catheters
• CPC Class Codes: A61M 25/10184 Means for controlling or monitoring inflation or deflation
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

A stent delivery system to facilitate introduction and placement of a stent, including a catheter having an expandable distal portion constructed and arranged for expanding the outer diameter of the catheter from a contracted state to an expanded state: a stent positioned around the distal portion of the catheter having a contracted condition and being expandable to an expanded condition, and being sized in the contracted condition to closely surround the catheter in the contracted state, the expandable distal portion of the catheter including a balloon within which there is included on the catheter shaft at least one body of a diameter larger than the catheter shaft to which the stent and balloon are fitted, as by crimping, for holding the stent in place until it is released therefrom by expansion of the balloon.

Claims

1. A stent delivery system comprising:

a radially expandable stent of generally cylindrical configuration, having a first end and a second end and a contracted state and an expanded state, and

a catheter having a shaft having a diameter and expandable inflatable means associated therewith at a distal part of the shaft, wherein the inflatable means comprises a balloon, and including mounting and retaining means for receiving the stent on the expandable inflatable means for radial expansion of the stent upon inflation of the inflatable means, the mounting and retaining means including at least one mounting body carried on and surrounding the shaft inside the inflatable means, the at least one mounting body being substantially the same length as the stent and being positioned on the shaft such that when the stent is loaded onto the inflatable means and the shaft in the stent'"'"'s contracted state at least a portion of the at least one mounting body is under the stent and between the first and second ends of the stent, whereby the diameter of the shaft and inflatable portion are increased at the distal part for facilitating the mounting and retaining of the stent.

2. The stent delivery system of claim 1 wherein the mounting body is of a material which resiliently deforms under radial pressure.

3. The stent delivery system of claim 2 wherein the material is elastomeric.

4. The stent delivery system of claim 2 wherein the material comprises high density polyethylene.

5. The stent delivery system of claim 2 wherein the material comprises silicone.

6. The stent delivery system of claim 1 wherein the at least one mounting body includes at least one separation whereby the flexibility of the body and catheter is increased.

7. The stent delivery system of claim 6 wherein the separation is in the form of a spiral.

8. The stent delivery system of claim 1 wherein the stent is crimped to the mounting and retaining means for delivery.

9. The stent delivery system of claim 1, wherein the stent has two opposite ends, the stent delivery system further including a pair of stops, each of which is respectively positioned at the opposite ends of the stent and carried by the shaft inside the inflatable means.

10. The stent delivery system of claim 9 wherein the stops are conical in shape.

11. The stent delivery system of claim 1 further including marker bands positioned proximally and distally of the stent.

12. The stent delivery system of claim 1 further including a stop carried by the shaft and positioned inside the inflatable means and axially spaced relative to the stent.

13. A stent delivery system comprising:

a catheter having a shaft and expandable inflatable means associated therewith at a distal part of the shaft, the expandable inflatable means comprising a balloon, and including mounting and retaining means for receiving a stent, the stent having a first end and a second end and a contracted state and an expanded state, to be delivered upon expansion of the inflatable means, the mounting and retaining means including at least two axially spaced mounting bodies inside the balloon and radially carried on and surrounding the shaft, the at least two mounting bodies being positioned on the shaft such that when the stent is loaded onto the inflatable means and the shaft in the stent'"'"'s contracted state at least a portion of each of the at least two mounting bodies are under the stent and between the first and second ends of the stent, and

the stent crimped on the balloon and the at least two mounting bodies such that opposite end portions of the stent are deformed to a diameter less than that of the at least two mounting bodies whereby the stent is interlocked with the mounting bodies until expansion of the stent and inflatable means to prevent accidental movement of the stent along the catheter during delivery.

14. The stent delivery system of claim 13 wherein the stent is generally tubular in shape and the mounting bodies are generally cylindrical in shape.

15. The stent delivery system of claim 13 wherein a portion of the stent between the mounting bodies is crimped to a lesser diameter than that of the mounting bodies.

16. The stent delivery system of claim 15 wherein the stent is generally tubular in shape and the mounting bodies are ring-like.

17. The stent delivery system of claim 13 wherein three spaced mounting bodies are included and the stent is crimped to a lesser diameter between the bodies.

18. The stent delivery system of claim 17 wherein the stent is generally tubular in shape and the mounting bodies are ring-like.

19. A balloon catheter for intraluminal delivery of a stent, the catheter comprising a shaft having a diameter, a balloon associated with a distal portion of the shaft for receiving a stent, the stent having a first end and a second end and a contracted state and an expanded state, and means for inflating the balloon, the shaft including at least one mounting body radially carried on the shaft inside the balloon, the at least one mounting body being substantially the same length as the stent, whereby the diameter of the shaft is increased inside the balloon to facilitate mounting of a stent to the catheter over the balloon, the at least one mounting body being positioned on the shaft such that when the stent is loaded onto the inflatable means and the shaft in the stent'"'"'s contracted state at least a portion of the at least one mounting body is under the stent and between the first and second ends of the stent.

20. The catheter of claim 19 wherein the mounting body is of a material which resiliently deforms under radial pressure.

21. The catheter of claim 20 wherein the material is elastomeric.

22. The catheter of claim 20 wherein the material is high density polyethylene.

23. The catheter of claim 20 wherein the material is silicone.

24. The catheter of claim 19 wherein the mounting body is configured with at least one separation whereby trackability of the catheter is improved.

25. The catheter of claim 24 wherein the separation is in a spiral configuration.

26. The catheter of claim 19 further including a pair of spaced stops.

27. The catheter of claim 26 wherein the stops are conical in shape.

28. The catheter of claim 19 further including spaced marker bands.

29. The catheter of claim 19 wherein the mounting body is cylindrical in shape.

30. The catheter of claim 19 wherein at least two spaced mounting bodies are included.

31. The catheter of claim 30 wherein the mounting bodies are ring-like.

32. The catheter of claim 19 wherein at least three spaced mounting bodies are included.

33. The catheter of claim 32 wherein the mounting bodies are ring-like.