Spinal fixation device
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United States of America Patent
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Apr 23, 2013
Grant Date -
Dec 31, 2009
app pub date -
Jun 25, 2008
filing date -
Jun 25, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A spinal fixation assembly has a bone screw with head having a continuously curved spherical outer surface. The curved surface nests in a split annular bushing having a plurality of segments curving around the screw head. The bushing has an outward extending flange that fits into a recess in a socket in a fixation plate. The plate has at least three legs which extend from ends of a cross-member to form one of an H shaped, X shaped or A shaped configuration. Each socket is curved to rotatably receive rotation of the bushing. The socket recess is larger than the bushing flange to allow the bushing to tilt a predetermined amount depending on a thickness of the outward extending flange.
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