Medical device with radiopacity
View Patent ↗An endoprosthesis, such as a stent, having a layer that can enhance the biocompatibility of the endoprosthesis, and methods of making the endoprosthesis are disclosed.
1. A stent, comprising:
a member including
a first portion; and
a second portion disposed outwardly of the first portion and having
a first layer including a radiopaque material that is more radiopaque than the first portion, wherein the radiopaque material is selected from the group consisting of gold, platinum, and palladium,
a second layer comprising an alloy comprising the radiopaque material and a second material, and
a third layer comprising an oxidized form of the alloy.
2. The stent of claim 1 , wherein the radiopaque material is platinum.
3. The stent of claim 1 , wherein the second material is selected from the group consisting of titanium, chromium, palladium, niobium, and silicon.
4. The stent of claim 1 , wherein the first portion comprises a material selected from the group consisting of stainless steel and nickel-titanium alloy.
5. The stent of claim 1 , wherein the first portion is the innermost portion of the member.
6. The stent of claim 1 , wherein the first portion contacts the second portion.
7. The stent of claim 1 , further comprising a third portion between the first portion and the second portion.
8. The stent of claim 1 , further comprising a polymeric layer on the member.
9. The stent of claim 1 , further comprising a drug-releasing layer on the member.
10. A stent, comprising:
a member including
a first portion having
a first layer including a radiopaque material, wherein the radiopaque material is selected from the group consisting of gold, platinum, and palladium, and
a second layer comprising an alloy comprising the radiopaque material and a second material, and
a third layer comprising an oxidized form of the alloy.
11. The stent of claim 10 , wherein the radiopaque material is platinum.
12. The stern of claim 10 , wherein the second material is selected from the group consisting of titanium, chromium, palladium, niobium, and silicon.
13. The stent of claim 10 , wherein the third layer is the outermost layer.
14. The stent of claim 10 , further comprising a polymeric layer on the member.
15. The stent of claim 10 , further comprising a drug-releasing layer on the member.
16. The stent of claim 10 , wherein the oxidized form of the alloy comprises an oxide, a nitride, or a carbide.
17. The stent of claim 10 , wherein the oxidized form of the alloy comprises an oxide.
18. The stent of claim 1 , wherein the oxidized form of the alloy comprises an oxide, a nitride, or a carbide.
19. The stent of claim 1 , wherein the oxidized form of the alloy comprises an oxide.
20. A stent, comprising:a member including
an innermost first portion; and
a second portion disposed outwardly of the first portion and having
a first layer including a radiopaque material that is more radiopaque than the first portion,
a second layer comprising an alloy comprising the radiopaque material and a second material, wherein at least one of the radiopaque material and the second material comprises iridium, and
a third layer comprising an oxidized form of the alloy, the oxidized form comprising an oxide.