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US 6,830,638 B2Granted
Medical devices configured from deep drawn nickel-titanium alloys and nickel-titanium clad alloys and method of making the same
AssigneeAdvanced Cardiovascular Systems, Inc.
InventorsJohn F. Boylan, William J. Boyle, Kevin M. Magrini, Scott J. Huter
Life of this patent
Estimating the term…
Abstract
Nickel-titanium alloys that have been deep drawn in a cold working process have linear pseudoelastic behavior without a phase transformation or onset of stress-induced martensite. A medical device made from a structural element which has been deep drawn and subsequently formed into a desired medical device geometry will experience such linear pseudoelastic behavior.
Claims20
A medical device, comprising:
- a structural element having a particular medical device geometry formed from nickel-titanium alloy and being collapsible to be placed in a delivery position and self-expandable from the delivery position to a deployed position, where the nickel-titanium alloy has been processed in a deep drawing process which forms hollow-shaped structural element and cold works the nickel-titanium alloy so that it remains in a martensitic phase only regardless of stress that may be applied to the structural element to maintain the structural element in the delivery position, the hollow-shaped structural element being formed into the desired medical device geometry which includes a hollow structure.
A method for manufacturing a medical device for use in a body lumen, comprising:
- providing nickel-titanium stock;
- deep drawing the nickel-titanium alloy stock into a structure element having a hollow shape;
- and
- forming the structural element into a desired medical device geometry which includes a hollow structure, the structural element being capable of assuming a first position when a stress is applied to it and movable to a second position when the stress is removed.
1 more element
A self-expanding medical device, comprising:
- a structural element having a particular medical device geometry formed from a nickel-titanium alloy and being collapsible to be placed in a delivery position and self-expandable from the delivery position to a deployed position, wherein the nickel-titanium alloy has been processed in a deep drawing process which forms hollow-shaped structural element and cold works the nickel-titanium alloy and heat treated so that the alloy remains in a martensitic phase only regardless of stress that may be applied to the structural element to maintain the structural element in the delivery position, the hollow-shaped structural element being formed into the desired medical device geometry which includes a hollow structure.
Dependencies are inferred from the claim text.