Polyaxial bone anchor with pop-on shank, friction fit retainer and winged insert
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United States of America Patent
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May 21, 2013
Issued Date -
N/A
app pub date -
Apr 13, 2012
filing date -
Jun 15, 2009
priority date (Note) -
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Abstract
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A down-loadable compression insert with tool receiving arm extensions, a down-loadable friction fit split retaining ring and an up-loadable shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled.
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