The invention relates to an intervertebral disc prosthesis comprising at least two plates, namely first and second plates, articulated about each other by means of a curved surface, namely articulation, of at least one of the plates, each of the plates comprising a surface known as a contact surface,...http://www.google.es/patents/US7842088?utm_source=gb-gplus-sharePatente US7842088 - Intervertebral disc prosthesis
