Radiopaque intraluminal stents comprising cobalt-based alloys containing one or more platinum group metals, refractory metals, or combinations thereof
First Claim
1. A radiopaque stent, comprising:
- a cylindrical main body comprising a cobalt-based alloy including cobalt, chromium, platinum, palladium, and an austenitic stabilizer for cobalt including a combination of manganese and optionally nickel, the cobalt-based alloy including less than 5 weight percent nickel and comprising no more than about 20 percent by weight iron;
wherein the cobalt-based alloy has a relative radiopacity greater than 4.5 barnes/cm3, and wherein the radiopaque stent has at least 20% elongation to achieve adequate stent expansion;
wherein an entirety of the stent is formed from the cobalt-based alloy.
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Abstract
Embodiments are directed to radiopaque implantable structures (e.g., stents) formed of cobalt-based alloys that comprise cobalt, chromium and one or more platinum group metals, refractory metals, precious metals, or combinations thereof. Platinum group metals include platinum, palladium, ruthenium, rhodium, osmium, and iridium. Refractory metals include zirconium, niobium, rhodium, molybdenum, hafnium, tantalum, tungsten, rhenium, and precious metals include silver and gold. In one embodiment, the one or more included platinum group or refractory metals substitute at least partially for nickel, such that the alloy exhibits reduced nickel content, or is substantially nickel free. The stents exhibit improved radiopacity as compared to similar alloys including greater amounts of nickel.
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Citations
28 Claims
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1. A radiopaque stent, comprising:
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a cylindrical main body comprising a cobalt-based alloy including cobalt, chromium, platinum, palladium, and an austenitic stabilizer for cobalt including a combination of manganese and optionally nickel, the cobalt-based alloy including less than 5 weight percent nickel and comprising no more than about 20 percent by weight iron; wherein the cobalt-based alloy has a relative radiopacity greater than 4.5 barnes/cm3, and wherein the radiopaque stent has at least 20% elongation to achieve adequate stent expansion; wherein an entirety of the stent is formed from the cobalt-based alloy.
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2. A radiopaque stent, comprising:
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a cylindrical main body comprising a cobalt-based alloy including cobalt, chromium, manganese, and at least one of platinum or palladium; wherein a collective amount of platinum and/or palladium in addition to any included amount of one or more other platinum group metals, refractory metals, or precious metals selected from the group consisting of rhodium, iridium, osmium, ruthenium, zirconium, niobium, hafnium, tantalum, tungsten, rhenium, silver, and gold, is at least 10% by weight of the cobalt-based alloy, the cobalt-based alloy including no more than 1% nickel by weight, and comprising no more than about 20% by weight iron; wherein the cobalt-based alloy has a relative radiopacity greater than 4.5 barnes/cm3, and wherein the radiopaque stent has at least 20% elongation to achieve adequate stent expansion; wherein an entirety of the stent is formed from the cobalt-based alloy. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A radiopaque stent, comprising:
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a cylindrical main body comprising a cobalt-based alloy including cobalt, chromium, an austenitic stabilizer for cobalt including a combination of manganese and optionally nickel, and one or more platinum group metals or precious metals selected from the group consisting of platinum, palladium, rhodium, iridium, osmium, ruthenium, silver and gold, the cobalt-based alloy including less than 5 weight percent nickel and comprising no more than about 20 percent by weight iron; wherein the cobalt-based alloy has a relative radiopacity greater than 4.5 barnes/cm3, and wherein the radiopaque stent has at least 20% elongation to achieve adequate stent expansion; wherein an entirety of the stent is formed from the cobalt-based alloy. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification