High strength member for intracorporeal use
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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
85 Claims
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1-36. -36. (canceled)
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37. 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 expanded 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 are elastically incompressible to the first low profile delivery configuration without plastic deformation and have an elasticity insufficient to allow expansion from the first low profile delivery configuration to the second radially expanded configuration without plastic deformation. - View Dependent Claims (38, 39, 40, 41, 42, 43, 72, 73, 74, 75, 76)
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44. 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 generally aligned along a common longitudinal axis and formed from metallic alloy tubular member containing cobalt, chromium, and molybdenum; and
the stent has a first low profile configuration for delivery and a second radially expanded 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. - View Dependent Claims (45, 46, 47, 48, 49, 50, 78, 79, 80, 81)
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51. 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 a metallic alloy containing cobalt, chromium, molybdenum and nickel, the cylindrical elements having a transverse dimension of about 0.003 inch and generally aligned along a common longitudinal axis; and
the stent has first low profile configuration for delivery and a second radially expanded 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 elasticity 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.
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52. A cylindrically shaped balloon-expandable stent for use in a coronary artery, comprising:
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an interior chamber configured to receive an expandable member for plastically expanding the stent from a first low profile delivery configuration to a second radially expanded configuration, the second radially expanded configuration having a diameter suitable to hold open the coronary artery; and
the stent having a plurality of independently expandable and interconnected cylindrical elements, each cylindrical element formed from tubular member of an alloy containing cobalt, chromium, molybdenum and nickel, the cylindrical elements having a transverse dimension of about 0.003 inch and generally aligned along a common longitudinal axis.
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53. 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 elasticity 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. - View Dependent Claims (54, 55, 56, 57, 58, 59, 60, 61)
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62. A stent, comprising:
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a plurality of independently expandable and interconnected cylindrical elements formed 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, and one element from the group consisting of molybdenum and tungsten;
the cylindrical elements being generally aligned along a common longitudinal axis; and
the cylindrical elements having an undulating component which has an electrochemically polished metallic surface;
wherein the stent is plastically deformable from a first low profile delivery configuration to a second radially expanded configuration having a diameter suitable to hold open the coronary artery. - View Dependent Claims (63, 64, 65)
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66. A stent, comprising:
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a plurality of independently expandable and interconnected cylindrical elements formed 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, and an amount of molybdenum up to about 15 weight percent;
the cylindrical elements being generally aligned along a common longitudinal axis; and
the cylindrical elements having an undulating component which has an electrochemically polished metallic surface; and
wherein the stent is plastically deformable from a first low profile delivery configuration to a second radially expanded configuration having a diameter suitable to hold open the coronary artery. - View Dependent Claims (67, 68, 69, 70, 71)
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77. A cylindrically shaped balloon-expandable stent configured for use in a coronary artery, comprising
a plurality of independently expandable and interconnected cylindrical elements generally aligned along a common longitudinal axis and formed of an alloy containing cobalt, chromium, molybdenum, and nickel; -
the cylindrical elements having an undulating component with an electrochemically polished metallic surface;
a biocompatible coating on the electrochemically polished metallic surface of the cylindrical elements; and
the stent is plastically deformable from a first low profile configuration to a second radially expanded configuration having a diameter suitable to hold open the coronary artery;
wherein the cylindrical elements of the stent have an elasticity insufficient to allow expansion from the first low profile configuration to the second radially expanded configuration without plastic deformation so as to be permanent.
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82. 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, the cylindrical elements generally aligned along a common longitudinal axis and formed from metallic alloy containing cobalt, chromium, and molybdenum;
undulations that are plastically expandable in a blood vessel for deployment therein;
the stent having electrochemically polished tubular internal and external surfaces and a reticulated tubular structure having bounded openings for blood perfusion, the reticulated tubular structure having a continuum body made from tubing; and
the stent has a first low profile configuration for delivery and a second radially expanded 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.
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83. 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 expanded 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 stent is formed from a tubular alloy and has a smaller unexpanded diameter before plastic expansion and an expanded diameter upon plastic expansion.
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84. A cylindrically shaped balloon expandable stent configured for use in a vessel, 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 expanded 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 vessel;
wherein the stent is formed by cutting voids from a member having a surface and a thickness to form a stent having integrally interconnected struts, the stent being plastically deformable inside a vessel from an unexpanded diameter to an expanded diameter to hold open the vessel. - View Dependent Claims (85)
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Specification