Locking Bone Plates with Controlled Locking Screw Misalignment
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United States of America Patent
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N/A
Issued Date -
Aug 13, 2009
app pub date -
Mar 28, 2007
filing date -
Mar 28, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bone plate system for fixing bone fractures includes a locking bone plate and a conically-shaped drilling sleeve. The bone plate has at least one threaded hole, and with the drilling sleeve screwed into the bone plate hole, a drill bit guided through the sleeve drills a hole into bone having a central axis angularly misaligned with the central axis of the bone plate hole. The angle between the drilled hole's central axis and the bone plate hole's central axis is equal to or less than the tolerance angle of the threads of the bone plate hole. This allows a bone plate screw to be imperfectly seated with respect to the bone plate hole and still screwed into the hole to lock the plate without jamming the screw head into the plate hole, while still allowing the screw to be screwed out if needed.
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