Polyaxial bone screw with spherical capture, compression insert and alignment and retention structures
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United States of America Patent
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Aug 16, 2016
Issued Date -
N/A
app pub date -
Jul 31, 2012
filing date -
Feb 22, 2005
priority date (Note) -
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Abstract
A polyaxial bone screw assembly includes a receiver, a shank, an articulation structure for retaining the shank in the receiver and a compression insert for engagement with a longitudinal connecting member such as a rod. The articulation structure includes substantially spherical convex and concave surfaces that slidably engage both shank and receiver surfaces to provide compound articulation between the receiver and the shank. The receiver includes inwardly directed spring tabs engaging the insert and prohibiting rotation of the insert within the receiver.
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