Polyaxial bone anchor with non-pivotable retainer and pop-on shank, some with friction fit
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United States of America Patent
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Oct 15, 2013
Issued Date -
N/A
app pub date -
Oct 5, 2010
filing date -
Jun 15, 2009
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in a receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. The upper portion expands a retaining member in the receiver cavity to capture the shank upper portion in the receiver. In some embodiment either the retaining member or an insert provide for a friction fit of the shank upper portion in the receiver resulting in non-floppy placement of the shank with respect to the receiver. Some retainers and inserts have a lock-and-release feature. Final locking of the polyaxial mechanism is provided by frictional engagement between the shank upper portion and the retaining member. A pre-assembled receiver, retaining member and optional insert may be popped-on or snapped-on to the shank upper portion prior to or after implantation of the shank into a vertebra.
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