Self-retaining bolt for internal spinal stabilizers
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United States of America Patent
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-
Dec 30, 2003
Issued Date -
N/A
app pub date -
Aug 17, 2000
filing date -
Sep 25, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multi-axis correction washer for use with a spinal stabilizer for internal spinal fixation. The body of the washer is provided in cylindrical and wedge-shaped cylindrical configurations with a passage through the center axis of the longitudinal axis of the cylinder and/or offset from the center axis of the cylindrical washer and a shoulder or other structure for rotatably engaging an aperture in a spinal implant. The spinal implant can be a plate and screw-type, ladder-type, or monorail-type spinal fixation system. The washer is provided with a concave surface and a bearing surface, the former being adapted to engage the hemispherically-shaped head of the pedicle screw and the nut threaded onto the pedicle screw bearing against the latter. The washer is rotated to provide an infinite range of angles and pedicle screw placements relative to the central axis of the spinal column for maximum flexibility of installation and to effectively transfer the load on the spinal column to the implant, all while maintaining an angle of approximately 90.degree. between the head of the screw and/or nut and the washer that engages the implant.
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