An apparatus includes an interbody spinal fusion implant having a leading end, a trailing end, and a length therebetween, and opposed upper and lower portions adapted to contact each of the adjacent vertebral bodies. Each of the upper and lower portions has at least one opening adapted to communicate...http://www.google.de/patents/US6558423?utm_source=gb-gplus-sharePatent US6558423 - Interbody spinal fusion implants with multi-lock for locking opposed screws
