Polyaxial locking screw plate assembly
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United States of America Patent
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Nov 1, 2011
Grant Date -
Jan 3, 2008
app pub date -
Sep 7, 2007
filing date -
Feb 26, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A bone fixation screw includes a threaded screw shank and a screw head having upper and lower ends. The screw head lower end is secured to a proximal end of said screw shank. The screw head has substantially frustospherical shaped side surfaces and is split into segments at one of the ends. The head is radially expandable at the one end. An expansion screw is centrally received in the screw head. An interface between the expansion screw and the screw head forms a cam mechanism for expanding the screw head upon axial rotation of the expansion screw.
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