An osteosynthetic anchor bolt has a shaft which has at its front end an external thread having a major diameter greater than the diameter of the shaft and at the rear an internally threaded socket to accept a compression screw. The profile of the external thread is designed in such manner that there...http://www.google.de/patents/US5116336?utm_source=gb-gplus-sharePatent US5116336 - Osteosynthetic anchor bolt
