A - Human Necessities
61
L
A61L 31/14 (2006.01) A61F 2/90 (2006.01) A61L 31/02 (2006.01) A61F 2/86 (2006.01)
Patent
CA 2235783
A stent for use in a lumen in a human or animal body, has a generally tubular body formed from a shape memory alloy which has been treated so that it exhibits enhanced elastic properties with a point of inflection in the stress-strain curve on loading, enabling the body to be deformed inwardly to a transversely compressed configuration for insertion into the lumen and then revert towards its initial configuration, into contact with and to support the lumen. The shape memory alloy comprises nickel, titanium and from about 3 at.% to about 20 at.%, based on the weight of the total weight of the alloy composition, of a ternary element selected from the group consisting of niobium, hafnium, tantalum, tungsten and gold. The ratio of the stress on loading to the stress on unloading at the respective inflection points on the loading and unloading curves is at least about 2.5:1, and the difference between the stresses on loading and unloading at the inflection points at least about 250 MPa.
Burpee Janet
Duerig Thomas
Stockel Dieter
Nitinol Development Corporation
Sim & Mcburney
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