Intervertebral prosthesis making possible rotatory stabilization and flexion/extension stabilization
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United States of America Patent
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Mar 11, 1997
Grant Date -
N/A
app pub date -
Feb 8, 1995
filing date -
Jul 7, 1992
priority date (Note) -
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Abstract
A prosthesis including (a) a flexible ligament (1) with a first narrowed thinner portion (2) and a second wider portion (3) forming an extension of, and having a greater width and thickness (e2) than, the first portion, which portion may be passed around the spinous processes (12) of two adjacent vertebrae (L5, L4) in a figure eight pattern, whereas the second portion circles around the processes; (b) a semi-flexible interprocess block (6) with two pairs of through-channels (7, 8) having differing cross-sections and receiving the respective portions of the ligament; and (c) members (4, 5) for joining the ends of the ligament. The prosthesis prevents sagittal and frontal lumbar vertebral rotational instability.
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