Radiopaque intraluminal stents comprising cobalt-based alloys containing one or more platinum group metals, refractory metals, or combinations thereof

A radiopaque stent, comprising:

• a cylindrical main body comprising a cobalt-based alloy comprising cobalt, chromium, an austenitic stabilizer for cobalt including a combination of manganese and nickel, and one or more platinum group metals or precious metals selected from the group of platinum, palladium, rhodium, iridium, osmium, ruthenium, silver and gold;
• wherein the cobalt-based alloy comprises from 31 weight percent to 51 weight percent cobalt, from 15 weight percent to 20 weight percent chromium, from 8 weight percent to 30 weight percent of the one or more platinum group metals or precious metals;
• wherein the cobalt-based alloy includes up to 8 weight percent nickel, up to 20 weight percent manganese, a combined weight percentage of manganese and nickel being up to 25 weight percent, the cobalt-based alloy comprising no more than about 20 percent by weight iron,
• wherein the cobalt-based alloy has a radiopacity from 4.6 barnes/cm3 to 6.5 barnes/cm3.