Pedicle screw system comprising a locking screw with threaded chamfer

A clamping screw for a bone screw system which includes a bone screw comprising a tulip which forms a seat for a longitudinal support for surgical connection of adjacent bone screws and is provided with a tulip thread,

• wherein the clamping screw comprises a longitudinal axis and a clamping screw thread for locking the longitudinal support by clamping in the seat,
• wherein the clamping screw thread on a run-in side includes a radial thread cut at which the clamping screw thread is reduced or withdrawn in a radial direction, wherein the thread cut has a circumferential surface,
• wherein the thread cut has a transition section in which the circumferential surface has a varying radial distance in the radial direction from the longitudinal axis of the clamping screw,
• wherein the radial distance between the circumferential surface and the longitudinal axis on a run-out side of the transition section corresponds to an outer thread radius, and the radial distance between the circumferential surface and the longitudinal axis on the run-in side of the transition section is smaller than a thread core radius, and
• wherein the radial distance between the circumferential surface of the transition section and the longitudinal axis in a circumferential extension varies continuously and/or constantly.