Artificial intervertebral disc utilizing a ball joint coupling
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United States of America Patent
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-
Jul 21, 2009
Grant Date -
Nov 20, 2003
app pub date -
Jun 19, 2002
filing date -
Jul 16, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
An artificial intervertebral disc having a pair of opposing plate members for seating against opposing vertebral bone surfaces, separated by a ball joint coupling. One plate member has a centrally located ball-shaped protrusion that is rotatably coupled in a central socket in a cone-shaped protrusion on the other plate member. Thereby, the plate members are angulatable with respect to one another. Further, the disc assembly will not come apart under tension loads applied to the plate members, and the location of the ball joint coupling provides the disc assembly with a stationary centroid of motion that is centrally located between the vertebral bone surfaces, both causing the disc assembly to behave similarly in these respects to a healthy natural intervertebral disc.
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