Medical devices incorporating at least one element made from a plurality of twisted and drawn wires at least one of the wires being a nickel-titanium alloy wire
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United States of America Patent
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-
Aug 21, 2001
Issued Date -
N/A
app pub date -
Aug 31, 1998
filing date -
May 2, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Medical devices are provided which utilize a highly flexible cable of two and preferably three or more strands of wire, at least one of which is a nickel-titanium alloy strand. The strands are twined to form a wire rope which is drawn through successive dies to reduce its diameter until the outer surface of the cable is substantially smooth. A cable of all nickel-titanium alloy strands has been found to have an improved elasticity over a superelastic nickel-titanium wire of the same diameter. The cable is used in medical devices in which increased elasticity of a wire-like element is desired. Twisted and drawn cables incorporating a strand of a radiopaque metal or alloy with one or more nickel-titanium strands may be used in devices in which radiopacity of a flexible portion of the device is desired. Twisted and drawn cables incorporating a strand of a highly electrically conductive metal or alloy with one or more nickel-titanium strands may be used in devices in which electrical conductivity of a flexible portion of the device is desired.
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