Plate and screw assembly for fixing bone pieces, the assembly including a plate and at least one screw, the plate including at least one orifice that defines a cavity for housing a head of the screw and the screw head is provided with a resilient retainer for retaining the head of the screw within the...http://www.google.es/patents/US6241731?utm_source=gb-gplus-sharePatente US6241731 - Plate and screw assembly for fixing bones
