pivotal anchor with snap-in-place insert having rotation blocking extensions
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United States of America Patent
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May 29, 2018
Issued Date -
N/A
app pub date -
Dec 29, 2011
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 friction fit compression insert (some with lock and release feature), a planar split retaining ring and a 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 and the receiver and insert may include aligned tool receiving apertures for lock and release of the polyaxial mechanism.
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