Cylindrically-shaped balloon-expandable stent
First Claim
1. A cylindrically shaped balloon-expandable stent configured for use in a coronary artery, comprising:
- a plurality of independently expandable and interconnected cylindrical elements formed of an alloy containing cobalt, chromium, molybdenum, and nickel and generally aligned along a common longitudinal axis; and
the stent has a first low profile configuration for delivery and a second radially expandable configuration and is plastically deformable from the first low profile delivery configuration to the second radially expanded configuration, the second radially expanded configuration having a diameter suitable to hold open the coronary artery, wherein the cylindrical elements of the stent have an clasticity insufficient to allow expansion from the first low profile delivery configuration to the second radially expanded configuration without plastic deformation so as to be permanent, and the cylindrical elements having an undulating component, wherein the undulating component has an electrochemically polished metallic surface;
the stent further comprising a biocompatible coating on the electrochemically polished metallic surface of the cylindrical elements.
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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.
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Citations
7 Claims
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1. A cylindrically shaped balloon-expandable stent configured for use in a coronary artery, comprising:
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a plurality of independently expandable and interconnected cylindrical elements formed of an alloy containing cobalt, chromium, molybdenum, and nickel and generally aligned along a common longitudinal axis; and
the stent has a first low profile configuration for delivery and a second radially expandable configuration and is plastically deformable from the first low profile delivery configuration to the second radially expanded configuration, the second radially expanded configuration having a diameter suitable to hold open the coronary artery, wherein the cylindrical elements of the stent have an clasticity insufficient to allow expansion from the first low profile delivery configuration to the second radially expanded configuration without plastic deformation so as to be permanent, and the cylindrical elements having an undulating component, wherein the undulating component has an electrochemically polished metallic surface;
the stent further comprising a biocompatible coating on the electrochemically polished metallic surface of the cylindrical elements. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification