Polyaxial pedicle screw assembly
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United States of America Patent
Stats
-
Nov 4, 2008
Grant Date -
Aug 3, 2006
app pub date -
Jan 30, 2006
filing date -
Jan 31, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A fastener and a bone fixation assembly for the internal fixation of vertebral bodies such as a pedicle screw is provided which allows a detachable tulip to be provisionally locked to a pedicle screw, while separately, the rod securely locks to the tulip. According to one exemplary embodiment, the tulip assembly includes a tulip body and an inner tulip member, the tulip body having a non-circular surface disposed on an outer surface. Additionally, a fastener is coupled to the tulip assembly and positionable to retain the tulip assembly on the head of a screw. Further, a cap having an outer surface and a plurality of inner protrusions is provided, wherein the plurality of inner protrusions are configured to mateably connect to the non-circular surface on the tulip body to compress the tulip assembly and secure a rod.
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