Variable angle bone screw fixation assembly

摘要

The arrangement has a clamping sleeve (4') receiving a bone screw (1'). The bone screw includes a shaft (10') with a bone thread (11') and a head (12') at a rear end. A holder (2') is provided with a holding opening and an adapting seat. The clamping sleeve is pivotably and movably mounted in the seat. The shaft includes a thickening part (15') in front of the head in a rear region. Width of the thickening part is increased toward the head. Width of the clamping sleeve is larger than width of the shaft in front of the thickening part and smaller than a largest width of the head.