Multi-axis internal spinal fixation
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United States of America Patent
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Mar 12, 2002
Grant Date -
N/A
app pub date -
Sep 25, 1998
filing date -
Sep 25, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A multi-axis correction washer for use with a spinal stabilizer for internal spinal fixation. The bodies of the washer are provided in cylindrical and wedge-shaped cylindrical configurations with a hole in the center 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 a hole 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 rotated to provide an infinite range of angles and 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 which engages the implant.
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