| 摘要 |
A multi-axis correction washer (36) for use with a spinal stabilizer (20) fo r internal spinal fixation. The body (46) of the washer is provided in cylindrical and wedge-shaped cylindrical configurations with a passage (47) through the center axis of the longitudinal axis (37) of the cylinder and/or offset from the center axis of the cylindrical washer and a shoulder (50) or other structure for rotatably engaging an aperture (52) in a spinal implant (32). 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 (45) and a bearing surface (49), the former being adapted to engage the hemispherically-shaped head (41) of the pedicle screw (34) and the nut (38) 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 th e implant, all while maintaining an angle of approximately 90 degrees between the head of the screw and/or nut and the washer that engages the implant.</S DOAB>
|
