Hybrid balloon-expandable/self-expanding prosthesis for deployment in a body vessel and method of making

Patent metadata

Field	Value
Publication number	US-9675481-B2
Application number	US-201414520796-A
Country	US
Kind code	B2
Filing date	Oct 22, 2014
Priority date	Dec 23, 2011
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A hybrid prosthesis for deployment in a body vessel includes a tubular stent body comprising a wire comprising a shape memory alloy, where the tubular stent body has a self-expanding portion comprising a distal portion of the wire and a balloon-expandable portion comprising a proximal portion of the wire. The shape memory alloy comprises an A f of less than 37° C. in the self-expanding portion and an A s of greater than 37° C. in the balloon-expandable portion.

First claim

The invention claimed is:

1. A method of making a hybrid prosthesis, the method comprising:
loading a proximal portion of a stent body comprising a shape memory alloy into a first hollow mandrel, the shape memory alloy having values of A s and A f below body temperature;
loading a distal portion of the stent body comprising the shape memory alloy over a second hollow mandrel, the second hollow mandrel comprising one or more throughholes in a wall thereof for passage of a cooling fluid;
heating the proximal portion of the stent body to a temperature in the range of from about 300° C. to about 550° C.;
exposing the distal portion of the stent body to a cooling fluid during the heating; and
increasing the values of A s and A f in the proximal portion of the stent body to greater than body temperature while the values of A s and A f in the distal portion of the stent body remain below body temperature, thereby forming a hybrid prosthesis including a balloon expandable proximal portion and a self-expanding distal portion.

2. The method of claim 1 , wherein, prior to loading the proximal portion of the stent body into the first hollow mandrel, the stent body is partially compressed.

3. The method of claim 1 , wherein the first hollow mandrel comprises an inner diameter larger than an outer diameter of a compressed medical balloon on a balloon catheter.

4. The method of claim 1 , wherein the first hollow mandrel includes a tapered portion at a distal end thereof, a remaining portion of the first hollow mandrel comprising an untapered portion having a substantially constant diameter along a length of the remaining portion, wherein the tapered distal portion increases from the constant diameter to a larger diameter in a direction of the second hollow mandrel.

5. The method of claim 4 , wherein the second hollow mandrel has an outer diameter larger than an inner diameter of the first hollow mandrel.

Assignees

• Cook Medical Technologies Llc

Inventors

• Vad Siddharth

Classifications

• A61F2002/821

  Ostial stents · CPC title

• A61F2/958

  Inflatable balloons for placing stents or stent-grafts · CPC title

• A61F2002/825

  having longitudinal struts · CPC title

• A61F2/94 Primary

  Stents retaining their form, i.e. not being deformable, after placement in the predetermined place · CPC title

• C22F1/10

  of nickel or cobalt or alloys based thereon · CPC title