Urological stent and deployment device therefor
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United States of America Patent
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Sep 16, 1997
Grant Date -
N/A
app pub date -
Mar 2, 1995
filing date -
Mar 3, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A stent adapted for placing in the urethra so as to retain the urethra's diameter above a critical level is provided. The stent comprises: a spiral band made of a two-way shape memory alloy having two memory states consisting of a first state in which said alloy is soft and substantially deformable and a second state in which the alloy has super elastic properties and is substantially non-deformable, the alloy changes from the fast state to the second state at a first transition temperature being above physiological body temperature and changes from the second to the first state at a second transition temperature being below physiological body temperature; in the second state consecutive windings of the band are adjacent one another so that they form together essentially a continuous cylindrical tube of a diameter above said critical level; in the first state the band forms a coiled structure having a maximal external diameter such so as to allow deployment of stent within the urethra.
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