Tubular medical endoprostheses
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. An implantable medical stent containing a cobalt alloy, wherein the implantable medical stent includes at least first and second layers, the first layer being formed of the cobalt alloy and the second layer being formed of a material that is more dense than the cobalt alloy.
2. The implantable medical stent of claim 1 , wherein the second layer is disposed inwardly of the first layer.
3. The implantable medical stent of claim 2 , wherein the second material comprises a metal selected from the group consisting of tungsten, tantalum, rhenium, iridium, silver, gold, bismuth, platinum and alloys thereof.
4. The implantable medical stent of claim 2 , wherein the first metal has a density of about 16 g/cc or greater.
5. The implantable medical stent of claim 2 , wherein the first and second layers are coaxial.
6. The implantable medical stent of claim 2 , wherein the first metal has a density of 9.9 g/cc or greater.
7. The implantable medical stent of claim 1 , wherein the second material comprises a metal selected from the group consisting of tungsten, tantalum, rhenium, iridium, silver, gold, bismuth, platinum and alloys thereof.
8. The implantable medical stent of claim 1 , wherein the first metal has a density of 9.9 g/cc or greater.
9. The implantable medical stent of claim 1 , wherein the first metal has a density of about 16 g/cc or greater.
10. The implantable medical stent of claim 1 , wherein the first and second layers are coaxial.