HYBRID BALLOON-EXPANDABLE/SELF-EXPANDING PROSTHESIS FOR DEPLOYMENT IN A BODY VESSEL AND METHOD OF MAKING

摘要

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 Af of less than 37° C. in the self-expanding portion and an As of greater than 37° C. in the balloon-expandable portion.

主权项

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 As and Af 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 As and Af in the proximal portion of the stent body to greater than body temperature while the values of As and Af 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.