Vertebral osteosynthesis material for scoliosis treatment, has connection rods connected to pedicle screws, where one screw is of polyaxial type and has flexible extended unit connecting threaded pin and base piece fixed to vertebrate

摘要

The material has connection rods (2) connected to pedicle screws (1). One screw is of polyaxial type and has a proximal threaded pin (6) articulated with respect to a base piece (5) fixed to a vertebrate. The polyaxial screw has a flexible extended unit (7) extending from the junction of the base piece and the pin and connecting the pin and the base piece.