An orthopedic bone plate system having a bone plate for placement adjacent one or more vertebral bodies. The bone plate has a first aperture extending along a longitudinal axis and an upper and lower surface. The bone plate system further includes a sliding element having a top portion and a base portion...http://www.google.fr/patents/US7491221?utm_source=gb-gplus-shareBrevet US7491221 - Modular polyaxial bone screw and plate
