Polyaxial bone anchor with pop-on shank and winged insert with friction fit compressive collet
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United States of America Patent
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Mar 20, 2018
Issued Date -
N/A
app pub date -
Sep 19, 2012
filing date -
Jun 15, 2009
priority date (Note) -
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status (Latency Note)
Importance
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 has a lower friction fit collet and an outer receiver press fit surface. A down-loadable retaining ring has at least one inner edge and outer tiered surfaces. The ring cooperates with the shank 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. A uni-planar assembly is included.
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