Spinal facet compression screw with variable pitch thread zones and buttress head
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United States of America Patent
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Mar 31, 2015
Grant Date -
Jan 26, 2012
app pub date -
Jul 18, 2011
filing date -
Jul 20, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A surgical implant comprising a screw element having a screw head, a first thread having a first thread pitch, a second thread having a second thread pitch and an intermediate portion coupling the first and second thread pitches with the first and second thread pitches being different. The implant has a buttressing head associated with the first thread, and it is dimensioned to be larger than a diameter of the first threads to provide external buttressing as the first and second threads compress a first bone and a second bone together.
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