Bistable cement restrictor
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United States of America Patent
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-
Mar 9, 1999
Grant Date -
N/A
app pub date -
Mar 27, 1997
filing date -
Mar 27, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A bistable cement restrictor is provided for creating a fixed obstruction at any selected point within a long bone, particularly at points beyond the isthmus of the bone. An exemplary cement restrictor includes a body having a first end and a second end. One or more bistable fins extend radially from the body and are movable from a first stable state to a stable state either mechanically or thermally. In the first stable state, the cement restrictor is narrower than in the second stable state. While the cement restrictor is readily transitionable from the first stable state to the second stable state, the transition can be irreversible.
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