Patent ID: 8449577

Claim:
Pedicle screw ( 1 ), comprising a screw shank ( 2 ) with a ball head ( 17 ) as well as a screw head ( 3 ) having two opposite recesses, characterized in that the ball head ( 17 ) has two opposite parallel surfaces ( 18 a , 18 b ) which abut on corresponding parallel surfaces ( 18 c , 18 d ) of the screw head ( 3 ) and in that a longitudinal axis passes through the two opposite recesses of the screw head ( 3 ) perpendicular to the parallel surfaces ( 18 c , 18 d ) of the screw head ( 3 ) and in that the screw head ( 3 ), which is supported on the screw shank ( 2 ), cannot freely rotate about the longitudinal axis of the screw shank ( 2 ), a fixation means ( 5 ), a ball element ( 6 ) with a recess for receiving a linking member ( 4 ) that is supported such that it is movable in the screw head ( 3 ), wherein the ball element ( 6 ) consists of two olives ( 8 , 9 ) supported on each other, having an internal diameter which is preferably equal to the external diameter of the linking member ( 4 ), having an external diameter which is substantially equal to the internal diameter of a bore in the screw head ( 3 ) in a direction parallel to the longitudinal axis of the screw shank ( 2 ), and the lower olive ( 8 ) is facing the screw shank ( 2 ) and the upper olive ( 9 ) is facing the fixation means ( 5 ), wherein the screw head ( 3 ) has an opening for receiving the fixation means ( 5 ) on the side which is opposite the screw shank ( 2 ), a tip of the fixation means ( 5 ) has a guide pin ( 11 ), and the upper olive ( 9 ) facing the fixation means ( 5 ) has a recess ( 10 ) for receiving the guide pin ( 11 ) of the fixation means ( 5 ).