Segmental instrumentation of the posterior spine
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United States of America Patent
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-
Jul 23, 1991
Grant Date -
N/A
app pub date -
Aug 9, 1990
filing date -
Aug 9, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Improved instrumentation of the posterior spine includes a threaded screw for insertion into the sacrum, threaded adjusting rods and intravertebral hook device on the end of the adjusting rod. One end of the adjusting rod includes a pivotal clevis assembly and an automatic safety interlock for securing the clevis assembly to the screw. The receiving end of the bone screw includes spaced arms to receive the clevis which is inserted and rotated to a locking position. Thereafter, the hooks are positioned on the lamina and the adjusting rod is adjusted for compression or distraction. The hex area on the adjusting rods are then safety wired. The generally triangular orientation provides added strength and a wider foot print attachment which will resist rotational forces. Also disclosed is an improved bone screw which facilitates placement of a bone cement in the desired location.
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