High strength member for intracorporeal use
First Claim
1. An expandable intracorporeal stent having a generally thin walled cylindrical shape and being formed of an alloy consisting essentially of about 28 to about 65% cobalt, about 2 to about 40% nickel, about 5 to about 35% chromium, up to about 12% molybdenum, up to about 20%. tungsten, up to about 20% iron and the balance inconsequential amounts of impurities and other alloying constituents.
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Abstract
This invention is directed to an intracorporeal device formed of a high strength Co—Ni—Cr alloy and is particularly suitable for forming a composite product with a pseudoelastic member formed of NiTi alloy. Suitable intracorporeal products include guidewires and stents. The high strength alloy consists essentially of about 28 to about 65% cobalt, about 2 to about 40% nickel, about 5 to about 35% chromium, up to about 12% molybdenum, up to about 20% tungsten, up to about 20% iron and the balance inconsequential amounts of impurities and other alloying constituents, with a preferred alloy composition including about 30 to about 45% cobalt, about 25 to about 37% nickel, about 15 to about 25% chromium and about 5 to about 15% molybdenum. Intravascular devices such as guidewires, stents and the like can be formed of this high strength Co—Ni—Cr alloy.
228 Citations
14 Claims
- 1. An expandable intracorporeal stent having a generally thin walled cylindrical shape and being formed of an alloy consisting essentially of about 28 to about 65% cobalt, about 2 to about 40% nickel, about 5 to about 35% chromium, up to about 12% molybdenum, up to about 20%. tungsten, up to about 20% iron and the balance inconsequential amounts of impurities and other alloying constituents.
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4. An expandable intracorporeal stent having a generally thin walled cylindrical shape and formed of an alloy exhibiting an ultimate tensile strength greater than 300 ksi wherein the alloy consists essentially of about 30 to about 45% cobalt, about 25 to about 37% nickel, about 15 to about 25% chromium and about 5 to about 15% molybdenum with inconsequential amounts of other alloying constituents and impurities.
- 5. An expandable stent formed of a generally thin walled, cylindrically shaped continuum of a metallic alloy containing cobalt, chromium and nickel.
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13. An cylindrically shaped, single piece stent which has a first cylindrical configuration with an interior chamber, which is formed of a continuum of metallic alloy containing cobalt, chromium and nickel and which is designed to be plastically deformed by radial expansion provided by an expandable member disposed within the interior chamber to a second cylindrical configuration with transverse dimensions greater than transverse dimensions of the first cylindrical configuration which are sufficient to hold open a patient'"'"'s body lumen.
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14. A cylindrically shaped intracorporeal device which is formed of a generally thin walled continuum of a metallic alloy containing cobalt, chromium and nickel, which has a first cylindrical configuration with an interior chamber and which is configured to be plastically deformed by radial expansion provided by an expandable member disposed within the interior chamber thereof to a second cylindrical configuration with transverse dimensions greater than transverse dimensions of the first configuration and sufficient to hold open a patient'"'"'s body lumen.
Specification