Patent ID: 8419744

Claim:
A device for establishing an anatomical reference point of an intervertebral disc for the attachment of at least one instrument intended for the implantation, through a posterior or posterolateral approach, of a disc prosthesis or osteosynthesis cage as a replacement for the intervertebral disc, the device comprising: first and second bone anchors each adapted to be attached to a vertebra; a coupling element on which the instrument is intended to be attached, the coupling element being mounted between the first and the second bone anchors; and elements operably adjusting a position of the coupling element relative to a position of the intervertebral disc; the elements operably adjusting a position of the coupling element comprising a horizontal platform having a longitudinal axis provided with an element for viewing the intervertebral disc having a geometrical axis; the viewing element being positioned in a plane substantially vertical along a vertical axis and being mounted to move on the platform so as to orient the geometrical axis in the direction of the intervertebral disc; and a connector operably connecting the platform to the first and second bone anchors, the connector being arranged to form a ball and socket link, the platform rotating relative to the connector around an axis perpendicular to the longitudinal axis and the vertical axis; and the viewing element being arranged with the platform so as to have a degree of freedom in translation along the longitudinal axis.