Polyaxial bone screw with shank-retainer inset capture
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United States of America Patent
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-
Sep 4, 2012
Issued Date -
N/A
app pub date -
May 23, 2008
filing date -
Jun 18, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A polyaxial bone screw assembly includes a threaded shank body member having an upper portion with an internal drive and, alternatively, a laterally extending alignment rib or fin. The bone screw assembly also includes a lockable receiver coupling member, an open retainer ring member having a slit or gap and a compression insert member. An inset conical or cylindrical surface on the shank upper portion frictionally engages a similarly shaped inner surface of the retainer ring. The receiver includes a restrictive lower opening that allows for uploading the shank upper portion and compressed retainer ring into the receiver cavity, but prevents passage of the retainer ring out of the receiver once the ring inner surface engages the conical surface of the shank upper portion.
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