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Artificial intervertebral disc having limited rotation using a captured ball and socket joint with a solid ball, a retaining cap, and an interference ball bearing
Artificial intervertebral disc having limited rotation using a captured ball and socket joint with a solid ball, a retaining cap, and an interference ball bearing
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机译:使用带实心球的固定球窝关节,固定盖和干涉球轴承来限制旋转的人造椎间盘
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摘要
An artificial disc having a pair of opposing baseplates, for seating against opposing vertebral bone surfaces, separated by a ball and socket joint that includes a solid ball mounted to protrude from one of the baseplates. The ball is captured within a curvate socket formed in a peak of a convex structure integral with the other of the baseplates. The socket is formed by opposing curvate pockets, one on the convex structure and one on a cap secured to the other of the baseplates. While the ball angulates in the socket, its rotation in the socket has a limited range due to interference between a ball bearing and curvate recesses on the convex structure and the ball. The ball and socket joint therefore permits the baseplates to rotate relative to one another through a limited range and also angulate relative to one another.
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