An assembly includes a body, a plunger, a biasing member and a set screw. The body has a top surface, a bottom surface, and a polygonal drive surface interposed between the top surface and the bottom surface. The body has a first passageway extending from the top to the bottom surface, a second passageway...http://www.google.fr/patents/US8002773?utm_source=gb-gplus-shareBrevet US8002773 - External fixator
