Artificial intervertebral disc having a bored semispherical bearing with a compression locking post and retaining caps
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United States of America Patent
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Apr 23, 2013
Grant Date -
Dec 11, 2008
app pub date -
May 23, 2008
filing date -
Feb 20, 2004
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An artificial intervertebral disc having a pair of opposing baseplates, for seating against opposing vertebral bone surfaces, uses a semispherical, bored bearing that is secured to the baseplates with compression locking posts and one or more retaining caps. The compression locking posts extend through the bearing bore and baseplate apertures such that the bearing is between the baseplates' inwardly facing surfaces. Retaining caps are attached to the compression locking posts, securing the baseplates to the bearing. Bearing surfaces on the inwardly facing side of each baseplate allow each baseplate to rotate relative to the bearing, however, rotation of each baseplate is limited by the interference of each baseplate and its respective retaining cap. Rotation of the baseplates about the longitudinal axis of the spine can be limited via a notch in the retaining caps and a groove in the baseplates, or vice versa.
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