Tubular medical endoprostheses

Abstract

A tubular prosthesis device for use within the body. The device includes, a metal filament material formed of metal outer member having an exposed outer surface and a core within the extended outer member formed of a different metal than the outer member. The core is secured within and substantially enclosed by the outer member. The device can be reduced to a small size for introduction into the body lumen and expandable to a sufficiently large size to engage the wall of the body lumen. Stents formed of composite wires are shown.

1 - 30 . (canceled) 
   
   
       31 . An implantable medical stent, comprising:
 a first layer;   a second layer; and   a third layer,   wherein a radiopacity of the first layer is different from a radiopacity of the second layer.   
   
   
       32 . The implantable medical stent of  claim 31 , wherein the radiopacity of the first layer is less than the radiopacity of the second layer. 
   
   
       33 . The implantable medical stent of  claim 32 , wherein the first layer is disposed inwardly of the second layer. 
   
   
       34 . The implantable medical stent of  claim 33 , wherein the second layer is disposed inwardly of third layer. 
   
   
       35 . The implantable medical stent of  claim 31 , wherein the first layer comprises stainless steel. 
   
   
       36 . The implantable medical stent of  claim 31 , wherein the second layer comprises a metal selected from the group consisting of tungsten, tantalum, rhenium, iridium, silver, gold, bismuth, platinum and alloys thereof. 
   
   
       37 . The implantable medical stent of  claim 31 , wherein the second layer comprises a material having a density of 9.9 grams per cubic centimeter or greater. 
   
   
       38 . The implantable medical stent of  claim 31 , wherein the second layer comprises a material having a density of 16 grams per cubic centimeter or greater.