Catheter Support for Stent Delivery

• US 20100274343A1
• Filed: 07/01/2010
• Published: 10/28/2010
• Est. Priority Date: 08/23/1996
• Status: Active Grant

• Current Assignee: Boston Scientific Scimed (Boston Scientific Corporation)
• Original Assignee: Boston Scientific Scimed (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.
• Granted Patent: US 8,152,819 B2
• Time in Patent Office: Days
• US Class Current: 623/1.110
• 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 catheter comprising:

an inner shaft having a proximal portion and a distal portion;

an inflatable balloon positioned about the distal portion of the inner shaft;

an expandable stent positioned along a portion of the inflatable balloon, the stent having a leading edge;

a first stop member positioned exteriorly to the inner shaft and interiorly to the inflatable balloon, the first stop member having a proximal end and a distal end and at least a portion of the first stop member having a conical shape, the cross section of the proximal end being larger than the cross section of the distal end, wherein the first stop member is positioned distally to the leading edge of the stent and is configured to protect the leading edge of the stent; and

at least one mounting body having at least a first position, in the first position, the at least one mounting body being positioned inside the inflatable balloon, exteriorly to the inner shaft, and proximally to the expandable stent.

2. The stent delivery catheter of claim 1 further comprising a second stop member, the second stop member positioned exteriorly to the inner shaft and interiorly to the inflatable balloon, the second stop member being proximal to the second stop member.

3. The stent delivery catheter of claim 1, wherein the at least one mounting body is axially movable within the balloon.

4. The stent delivery catheter of claim 3, wherein the at least one mounting body comprises an elastomeric material.

5. The stent delivery catheter of claim 3, wherein the at least one mounting body comprises high density polyethylene.

6. The stent delivery catheter of claim 3, wherein the at least one mounting body comprises silicone.

7. The stent delivery catheter of claim 1, wherein the at least one mounting body has a second position, in the second position, the at least one mounting body overlaps at least a portion of the expandable stent.

8. The stent delivery catheter or claim 1, wherein the expandable stent is crimped to the inflatable balloon.

9. The stent delivery catheter of claim 1, wherein the delivery catheter further comprises a pull wire and the mounting body comprises a proximal end and a distal end, the pull wire connected to the proximal end of the mounting body.

10. The stent delivery catheter of claim 1, wherein the mounting body comprises a sleeve that is slidably carried on the inner shaft, and wherein the mounting body has an enlarged portion for receiving the balloon and stent.

11. The stent delivery catheter of claim 1 further comprising at least one radiopaque marker, the first stop member being positioned around a portion of the at least one radiopaque marker.

12. The stent delivery catheter of claim 1, wherein the at least one mounting body comprises a spiral cut extending along the length of the at least one mounting body.