STRAIN WASHER FOR PLATE OSTEOSYNTHESIS

摘要

A strain washer (1) rigidly secures bone screws (15) in a bone plate (20) having several bores (21). The cylindrical strain washer (1) has a central axis (2), a central bore (3) with an inner thread (4) for receiving the bone screw (15), a lower section (5) with a surface (9) resting on the bone and an upper section (6). The upper section (6) is shaped in such a way that it may be introduced from below into the bore (21) of the bone plate (20). The mean circumference of the lower section (5) is smaller than the mean circumference of the upper section (6). This design allows this strain washer to be used with any type of bone plates (20) and bone screws (15). The strain washer (1) may be selectively set at any desired position of the bone plate (20) and acts at the same time as a spacer for reducing the contact surface between the bone plate (20) and the bone.