High strength member for intracorporeal use
First Claim
1. A method for making a stent, comprising:
- forming cylindrical elements with undulating components from an alloy material containing at least 2 weight percent each of cobalt, chromium, and nickel, the cylindrical elements generally aligned along a common longitudinal axis and interconnected;
electrochemically polishing the cylindrical elements, thereby forming a stent, the stent being plastically deformable to expand from a first diameter to a second larger diameter suitable for holding open a blood vessel.
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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.
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Citations
31 Claims
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1. A method for making a stent, comprising:
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forming cylindrical elements with undulating components from an alloy material containing at least 2 weight percent each of cobalt, chromium, and nickel, the cylindrical elements generally aligned along a common longitudinal axis and interconnected;
electrochemically polishing the cylindrical elements, thereby forming a stent, the stent being plastically deformable to expand from a first diameter to a second larger diameter suitable for holding open a blood vessel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for making a stent, comprising:
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forming cylindrical elements with undulating components from tubing of an alloy containing about 28 to about 65 weight percent cobalt, about 5 to about 35 weight percent chromium, about 2 to about 40 weight percent nickel, the undulating components have a relatively flat cross section and are arranged such that they are generally aligned along a common longitudinal axis and interconnected;
electrochemically polishing the cylindrical elements, thereby forming a stent, the stent being plastically deformable to expand from a first diameter to a second larger diameter suitable for holding open a blood vessel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A method for making a stent, comprising:
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forming cylindrical elements with undulating components from tubing of an alloy containing about 28 to about 65 weight percent cobalt, the alloy further containing chromium and nickel, and at least one element from the group consisting of molybdenum and tungsten, wherein the undulating components have a relatively flat cross section and the cylindrical elements are arranged such that the cylindrical elements are generally aligned along a common longitudinal axis and interconnected;
electrochemically polishing the cylindrical elements, thereby forming a stent plastically deformable to expand from a first diameter to a second larger diameter suitable for maintaining the patency of a blood vessel. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification