Bone plate integrating device for orthopedic surgery, has screw traversing orifice of plate and anchoring in bone, and having thread with helix angle lower than six degrees centigrade to give statically irreversible threading for screw

摘要

The device has a screw (2) traversing an orifice (3) of a bone plate (1) and anchoring in a bone, to integrate the bone plate on the bone. The orifice has a bore (4) for receiving a cylindrical part (8) of a head (5) of the screw. A thread (6) of the screw has a helix angle lower than six degrees centigrade to give statically irreversible threading for the screw.