Catheter support for stent delivery

• US 6,077,273 A
• Filed: 02/28/1997
• Issued: 06/20/2000
• Est. Priority Date: 08/23/1996
• Status: Expired due to Term

• Current Assignee: Boston Scientific Scimed, Inc. (Boston Scientific Corporation)
• Original Assignee: Scimed Life Systems Incorporated (Boston Scientific Corporation)
• Inventors: Blaeser, David J., Mattison, Richard C., Dusbabek, Andrew J., Euteneuer, Charles L., Larson, Christopher R., Ellis, Louis G., Brown, Terry V., Mertens, Steven P.
• Primary Examiner(s): Apley, Richard J.
• Assistant Examiner(s): Yu, Justin R.
• Application Number:
  US08/807,791
• Time in Patent Office: 1,208 Days
• Field of Search: 606/108, 606/195, 606/198, 606/194, 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 2025/1081 having sheaths or the like for covering the balloon but not forming a permanent part of the balloon, e.g. retractable, dissolvable or tearable sheaths
• 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 25/10185 Valves
• CPC Class Codes: A61M 25/10186 One-way valves
• CPC Class Codes: A61M 25/104 used for angioplasty

Abstract

An angioplasty and 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 or over which there is included on a catheter shaft at least one axially movable or enlargeable 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 catheter having a shaft and an inflation means associated therewith at a distal part of the shaft and including mounting and retaining means constructed and arranged to receive a stent, the stent having a length, wherein the stent is crimped on the expandable means for radial expansion of the stent, the mounting and retaining means being associated with the inflation means and being constructed and arranged for selectively providing an enlarged mounting body between the inflation means and the shaft and within the inflation means for receiving the stent thereon, wherein the enlarged mounting body has a length which is substantially the same length as the stent.

2. A stent delivery system comprising:

a catheter having a shaft and an expandable inflation means associated therewith at a distal part of the shaft and including a mounting and retaining means capable of receiving a stent, the stent having a length, wherein the stent is crimped onto the expandable inflation means and directly on the mounting and retaining means, whereby the stent may be radially expanded upon inflation of the inflation means, the mounting and retaining means comprising a mounting body having a length, the mounting body being substantially the same length as the stent and being carried on and surrounding the shaft inside the inflation means, whereby the diameter of the shaft and the diameter of the expandable inflation means are selectively increased at the distal part of the shaft for facilitating the mounting and retaining of the stent.

3. The delivery system of claim 2 wherein the mounting body is axially movable with respect to the inside shaft, and including means for moving the mounting body.

4. The stent delivery system of claim 3 wherein the mounting body is positioned to receive a stent and a stent is crimped to the mounting and retaining means over the balloon for delivery.

5. The stent delivery system of claim 3 wherein the mounting body is of a material which resiliently deforms under radial pressure.

6. The stent delivery system of claim 5 wherein the material is elastomeric.

7. The stent delivery system of claim 5 wherein the material comprises high density polyethylene.

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

9. The stent delivery system of claim 2 including a stop positioned at the distal part of the shaft which includes the inflation means and carried by the shaft inside the inflation means.

10. The stent delivery system of claim 2 including at least one marker band fastened to an inner lumen.

11. The stent delivery system of claim 2 wherein the inflation means comprises a balloon.

12. The stent delivery system of claim 2 including a stop positioned at the distal part of the catheter and carried by the shaft inside the inflation means.

13. A method of altering the configuration of a balloon catheter of variable profile for improved mounting of a stent on the balloon catheter and thereby providing a catheter for multiple use, comprising the steps of:

providing a balloon catheter of relatively low profile adapted and rearranged for use in an angioplasty procedure;

sliding a stent mounting body on the catheter to a position associated with the balloon such that the stent mounting body has a length and is positioned on the catheter within the balloon for receiving a stent and enlarging the catheter profile at that position, and

mounting a stent, having a length, on the balloon and the associated stent mounting body at that position of the stent mounting body, wherein the mounting body has substantially the same length as the stent.