Tapered root threaded hollow perforated interbody spinal fusion implants are disclosed for placement into a disc space in a human spine between adjacent vertebral bodies. The implants have opposite arcuate portions with lockable screws passing therethrough for engaging each of the adjacent vertebral...http://www.google.de/patents/US7637954?utm_source=gb-gplus-sharePatent US7637954 - Apparatus for inserting nested interbody spinal fusion implants
