A compression bone screw is described, with a shank having two opposite shank sections along its axial extent, a first thread being connected in a rotationally fixed manner to the shank in the region of the first shank section. The shank has at least one latching element for rotatably coupling a threaded...http://www.google.es/patents/US7794483?utm_source=gb-gplus-sharePatente US7794483 - Compression bone screw
