Polyaxial bone anchor with articulating retainer and multi-start closure
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
Jan 10, 2013
filing date -
Jun 15, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An open polyaxial bone anchor includes a pre-assembled receiver, retaining member and compression insert that may be popped-on or snapped-on to the shank upper portion prior to or after implantation of the shank into a vertebra. Cooperating closures have at least two helically wound forms thereon providing a multi-start closing mechanism for use between spaced arms of the bone anchor having mating helically wound structure thereon.
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