Screw head holding system for e.g. osteosynthesis plate in cervical backbone, has hole and screw head presenting complementary holding shapes after placing and locking screw in support, where hole presents arrangements formed by slit

摘要

The system has a hole and a screw head (2a) presenting complementary holding shapes after placing and locking a fixation screw (2) in a support e.g. bone. The hole has arrangements formed by a slit (1a1) that opens in an opening formed in thickness of a plate e.g. osteosynthesis plate (1), where the slit is angularly formed with respect a longitudinal axis of the plate. The screw head has a hemispherical face whose height is lower than depth of a hemispherical face of the hole for allowing angular orientation of the screw.