An expandable osteosynthesis implant has branches (5) each connected at one end to a seat (7) which is pierced by an orifice (8), suitable for being slid from a posterior direction between the facing faces of two consecutive vertebrae in order to hold them a given distance apart and restore stability...http://www.google.ca/patents/US6129763?utm_source=gb-gplus-sharePatent US6129763 - Expandable osteosynthesis cage
