POLYAXIAL BONE ANCHOR WITH POP-ON MULTI-THREAD SHANK, SOME WITH DIAMETRIC INTERFERENCE FIT INSERTS
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United States of America Patent
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app pub date -
Oct 23, 2013
filing date -
Oct 31, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Polyaxial and uni-planar bone screw assemblies include a multi-threaded shank body having an integral upper portion receivable in a one piece receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A compression insert and open retaining ring located in the receiver may be made of cobalt-chrome and the compression insert may provide a diametric interference fit with the receiver. Receivers or inserts may include resilient arm portions. The open 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.
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