An apparatus including 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 having at least one opening adapted to communicate...http://www.google.ca/patents/US7033394?utm_source=gb-gplus-sharePatent US7033394 - Interbody spinal fusion implants with end cap for locking vertebral body penetrating members
