Facet joint prosthesis
First Claim
1. A prosthesis for facet joints of the spinal column, comprising a first bearing piece, a retaining piece, a guide rod comprising an outer guide rod and an inner guide rod, and a locking device,the inner guide rod configured to engage in a telescopic manner with the outer guide rod, the locking device configured to secure the inner and outer guide rods against moving apart, andthe first bearing piece comprising a first pressure plate configured to rest on a vertebra and, on a side opposite to the first pressure plate, a first bearing shell which has an articular surface configured to interact with an articular surface of a vertebra adjacent to the vertebra on which the first pressure plate rests,wherein a pivot joint is provided to secure the guide rod on the first bearing piece.
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Accused Products
Abstract
A prosthesis for facet joints of the spinal column includes a bearing piece and a guide rod. The bearing piece includes a pressure plate that is configured for resting on an articular surface of the vertebra and, on the opposite side, a bearing insert which has an articular surface configured for interacting with an articular surface of an adjacent vertebra. The guide rod is secured on the bearing piece by means of a pivot joint. The bearing forces are transmitted to the vertebra via the pressure plate. In this way, the guide rod can have a narrow configuration, such that a slit excavated in the vertebra for receiving the guide rod can also be made narrow to permit a simple and reliable implantation technique which at the same time is gentle on the bone substance.
66 Citations
23 Claims
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1. A prosthesis for facet joints of the spinal column, comprising a first bearing piece, a retaining piece, a guide rod comprising an outer guide rod and an inner guide rod, and a locking device,
the inner guide rod configured to engage in a telescopic manner with the outer guide rod, the locking device configured to secure the inner and outer guide rods against moving apart, and the first bearing piece comprising a first pressure plate configured to rest on a vertebra and, on a side opposite to the first pressure plate, a first bearing shell which has an articular surface configured to interact with an articular surface of a vertebra adjacent to the vertebra on which the first pressure plate rests, wherein a pivot joint is provided to secure the guide rod on the first bearing piece.
Specification