A screw element for use in spinal, orthopedic or trauma surgery and a system of such a screw element and a screw driver adapted thereto

摘要

A screw element for use in spinal, orthopedic or trauma surgery, the screw element including a screw axis (S) and a screw thread (3); a drive portion (6) for engagement with a screw driver (20), wherein the drive portion (6) comprises a first recess (7) with a wall and substantially longitudinally extending drive grooves (8) formed in the wall,
a second recess (9) between a free end (5) of the screw element (1, 1') and the first recess (7), wherein the second recess (9) has a wall and a gradually increasing inner diameter towards the free end (5); and wherein in the wall of the second recess (9) guide grooves (10) are formed at positions corresponding to the position of the drive grooves (8) that allow an engagement portion (30) of a screw driver to be guided to enter the drive grooves (8). Further, a system is provided that includes the screw element and a screw driver adapted thereto.