A simple, safe implantable bone screw, and a method for distracting two bone segments, is provided. In general, the bone screw includes a shank having a threaded proximal portion and a distal portion with a major diameter that is less than a minor diameter of the threaded proximal portion. A transitional...http://www.google.de/patents/US7708766?utm_source=gb-gplus-sharePatent US7708766 - Distraction screw
