Patent ID: 8221469

Claim:
A pedicle screw with a closure device for securing a rod for stabilization of vertebral column, comprising a screw-in part, a head part provided on the screw-in part, a U-shaped recess disposed in the head part, which recess is formed by inner surfaces of two arms and a bottom surface connecting the two inner surfaces, in which recess the rod is insertable and is held by the closure device; wherein the closure device comprises a yoke-shaped locking element which has a collar on each of two end regions opposite each other, on each of which collars projections are provided, said projections being directed toward each other, a groove is provided outside on each of the two arms running transversely to these arms such that the yoke-shaped locking element is placeable on the arms and is rotatable, and, to reach a locking position, the projections each end up in the corresponding groove; wherein a tension screw is screwed into the yoke-shaped locking element, and the tension screw is connected in a rotatable way to a tension element, so that the tension screw, the locking element and tension element are connected as one unit; wherein the tension element is insertable in a guided way between the arms, and, in the locked position of the locking element, is able to be tensioned, by means of the tension screw, against the rod inserted in the recess; and wherein the tension screw has a threaded part that is extended by a bolt piece, and a support surface on the tension screw is formed between the threaded part and the bolt piece.