Spring loaded, load sharing polyaxial pedicle screw assembly and method
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United States of America Patent
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Feb 22, 2011
Grant Date -
Apr 26, 2007
app pub date -
Dec 11, 2006
filing date -
Feb 27, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
An assembly and method thereof comprising a screw head comprising an expandable bulbous end; a fixator component configured for receiving the bulbous end of the screw head; a load sharing mechanism positioned in between the bulbous end of the screw head and the bone fixator component, wherein the load sharing mechanism provides tensile resistance to the screw head; a pin mounted in the screw head; and a blocker adapted to engage the screw head. The screw head comprises a slot configured for receiving a longitudinal member. The load sharing mechanism may comprise any of a wave washer, a collapsible hollow washer, a coiled spring, and a flexible washer. Furthermore, the load sharing mechanism may comprise a washer having an outer surface with a plurality of cutout portions configured therein.
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