Abstract: A polyaxial pedicle screw has a screw shaft and a screw head with a substantially spherical base shape. The polyaxial pedicle screw is mounted in a receiving sleeve or area. An insertion sleeve can be pressed against the screw head to determine a relative pivot position between the receiving sleeve or area and the screw shaft. Two pivot guide or pivot restriction units each have at least one extension projecting radially and in the longitudinal direction of the screw beyond the spherical base shape of the screw head. The extensions form stops on their radial outer surfaces and are positioned to permit relative pivoting of the screw shaft and the area or receiving sleeve only in one pivoting plane, and to abut in a supporting manner against a radially inner circumferential side of the area or receiving sleeve during relative pivoting in another pivoting plane.

Abstract: The invention relates to a monolithic cervical or lumbar implant body for fusing spinal column segments, comprising: an upper side and a lower side which are spaced apart from one another while maintaining an intermediate space, wherein the upper side and the lower side are connected by webs, wherein the upper side and the lower side, with the exception of shape-defining and structure-reinforcing edge regions, are designed as a honeycomb surface with openings and enclose a wedge-shaped angle; at least one completely or partially open side surface for introducing bone substitute material; and an additional side surface having a stabilisation region and a recess for temporarily receiving a surgical instrument in the stabilisation region. Starting from the surfaces of the shape-defining and structure-reinforcing edge regions, there are several pin-shaped projections oriented in the direction of adjacent spinal column segments.

Abstract: A polyaxial pedicle screw has a screw shaft and a screw head with a substantially spherical base shape. The polyaxial pedicle screw is mounted in a receiving sleeve or area. An insertion sleeve can be pressed against the screw head to determine a relative pivot position between the receiving sleeve or area and the screw shaft. Two pivot guide or pivot restriction units each have at least one extension projecting radially and in the longitudinal direction of the screw beyond the spherical base shape of the screw head. The extensions form stops on their radial outer surfaces and are positioned to permit relative pivoting of the screw shaft and the area or receiving sleeve only in one pivoting plane, and to abut in a supporting manner against a radially inner circumferential side of the area or receiving sleeve during relative pivoting in another pivoting plane.

Abstract: Polyaxial pedicle screw with a head in the shape of a ball segment and with a threaded screw shank, wherein a hollow ball segment with a recess for receiving a rod-shaped connector is mounted in the head, in order to permit pivoting movements and rotation movements of the connector, wherein moreover, in the direction of the longitudinal axis of the threaded screw shank, the head in the shape of a ball segment has a cutout with an inner thread in which the rod-shaped connector can be moved in and out and, by means of the inner thread in the cutout, a grub screw can be introduced for blocking the hollow ball segment. According to the invention, a plastic buffer body is fitted in the hollow ball segment and is connected to a ram, wherein the ram has a head which engages in an associated annular groove in the plastic buffer body.

Abstract: Polyaxial pedicle screw with a head in the shape of a ball segment and with a threaded screw shank, wherein a hollow ball segment with a recess for receiving a rod-shaped connector is mounted in the head, in order to permit pivoting movements and rotation movements of the connector, wherein moreover, in the direction of the longitudinal axis of the threaded screw shank, the head in the shape of a ball segment has a cutout with an inner thread in which the rod-shaped connector can be moved in and out and, by means of the inner thread in the cutout, a grub screw can be introduced for blocking the hollow ball segment. According to the invention, a plastic buffer body is fitted in the hollow ball segment and is connected to a ram, wherein the ram has a head which engages in an associated annular groove in the plastic buffer body.