Polyaxial bone screw with cam capture
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United States of America Patent
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-
Sep 4, 2012
Grant Date -
Jun 12, 2008
app pub date -
Jan 16, 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 having an upper portion with a laterally extending lug and a retainer having an inner cam track for receiving the lug and thus attaching the shank upper portion to the retainer within a receiver. The retainer may be a closed or open ring. The receiver has a cavity and a U-shaped cradle defining a channel for receiving a longitudinal connecting member such as a spinal fixation rod. The retainer has an external surface that mates with an internal surface of the receiver, providing a ball joint.
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