Polyaxial pedicle screw having a through bar clamp locking mechanism
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United States of America Patent
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Oct 5, 1999
Issued Date -
N/A
app pub date -
Apr 30, 1998
filing date -
May 15, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A polyaxial orthopedic device for use with rod implant apparatus includes a screw having a curvate head, a cross bar mounting element having a socket into which the head of the screw is initially polyaxially nested. The cross bar mounting element further includes a vertical split which permits the socket to be expanded or compressed via the application of a corresponding force directed at the split. The cross bar mounting element further includes a pair of upwardly extending members which define a trough into which a cross bar element is positioned. The cross bar element includes features which permit the secure fixation of a rod thereto, as well as a selectively slideable element, such as a nut, which may be tightened to apply the compressive force necessary to compress the interior volume onto the head of the screw, thus locking the assembly in place.
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