High strength member for intracorporeal use
First Claim
1. An elongated member configured for advancement within a body lumen which is formed at least in part of a cold worked biocompatible alloy consisting essentially of 28 to 65% by wt. cobalt, 2 to 40% by wt. nickel, 5 to 35% by wt. chromium, up to 12% by wt. molybdenum, up to 20% by wt. tungsten and up to 20% by wt. iron.
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Accused Products
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.
382 Citations
29 Claims
- 1. An elongated member configured for advancement within a body lumen which is formed at least in part of a cold worked biocompatible alloy consisting essentially of 28 to 65% by wt. cobalt, 2 to 40% by wt. nickel, 5 to 35% by wt. chromium, up to 12% by wt. molybdenum, up to 20% by wt. tungsten and up to 20% by wt. iron.
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6. A composite product comprising:
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a) a first portion formed of a high strength alloy containing 28 to 65% by wt. cobalt, 2 to 40% by wt. nickel and 5 to 35% by wt. chromium; and b) a second portion formed of an alloy of nickel and titanium. - View Dependent Claims (7, 8, 9, 10)
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11. A co-worked high strength elongated composite intracorporeal device comprising:
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a) a first member formed of a pseudoelastic NiTi alloy which has;
desirable mechanical properties due to having been subjected to certain thermomechanical processing; andb) a second member secured to the first member formed of a high strength alloy which contains 28 to 65% by wt. cobalt, 2 to 40% by wt. nickel and 5 to 35% by wt. chromium and which has been subjected to the same thermomechanical processing to which the first member has been subjected. - View Dependent Claims (12)
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13. An elongated guidewire for intracorporeal use comprising:
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a) a core member having an inner portion formed of a pseudoelastic NiTi alloy; and an outer portion formed of a high strength alloy which contains 28 to 65% by wt. cobalt, 2 to 40% by wt. nickel and 5 to 35% by wt. chromium; and b) a helical coil disposed about a distal portion of the core member. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of making an elongated composite product comprising:
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a) providing an elongated outer sheath formed of a Co--Ni--Cr alloy with an inner lumen extending therein; b) advancing an elongated core member formed of NiTi alloy into the inner lumen of the outer sheath to form an assembly therewith; and c) cold working the assembly in a plurality of cold working stages and intermediate annealing the cold worked assembly between cold working stages. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification