Bone screw with outer threading; has shaft with outer threading and head and has sleeve screwed onto shaft directly next to head, with smooth slope from shaft to sleeve threading

摘要

The bone screw has a shaft (2) with an outer threading (4) and a head (3). A sleeve (5) with an inner threading (6) screws onto the shaft directly next to the head. The sleeve is shorter than the shaft and has an outer threading (7). The outer threadings of the shaft and of the sleeve are preferably self-tapping. The slope between the shaft and sleeve outer threadings is even. The sleeve has an end recess (10) to hold the screw head.