Vertebral osteosynthesis material for treating e.g. lumbar vertebra, has poly axial pedicle screw that includes proximal pin with articulation head in spherical skull cap shape, and body with wall in hemisphere shape

摘要

The material has a connection part (3) coupling a connection rod (2) to a poly axial pedicle screw (1), and a nut (4) assembling the rod and screw. The screw has a proximal pin (5) with an articulation head (11) in spherical skull cap shape, where the pin is connected to a body (6). The body has a cavity (16) received by the head, and a wall (17) surrounding the cavity. The wall surrounds the head and has a hemisphere shape. The body is inserted in a pedicle of a vertebra. An independent claim is also included for a method for fabrication of a poly axial anchoring unit.