Spondylolisthesis screw and instrument for implantation
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United States of America Patent
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Mar 5, 2013
Grant Date -
N/A
app pub date -
Oct 19, 2009
filing date -
Oct 17, 2008
priority date (Note) -
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Abstract
A screw for use in spinal surgery provided with a screw shaft and a screw head and at least one extension tab extending proximally from the screw head, the extension tab being defined relative to the screw head by a stress concentration feature. At a proximal end of the extension tab, the extension tab may be narrower in a circumferential direction than the extension tab at a distal portion thereof. A particular shape of stress concentration may be provided.
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