Polyaxial bone screw with multi-part shank retainer and pressure insert
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United States of America Patent
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Jan 25, 2011
Issued Date -
N/A
app pub date -
Apr 1, 2008
filing date -
Nov 23, 2004
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A polyaxial bone screw assembly includes a threaded shank body having an upper portion, a receiver, a compression insert and an articulation structure made from at least two discrete pieces. The shank upper portion cooperates with the compression insert to place the retainer in frictional engagement with the receiver. The geometry of the retainer structure pieces corresponds and cooperates with the external geometry of the shank upper portion to frictionally envelope the retainer structure between the capture structure and an internal surface defining a cavity of the receiver.
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