An implant for insertion into at least one bore formed between opposing vertebrae of a spine where the vertebrae are separated by a space and each vertebrae has end plates. The implant is in the shape of a solid generally cylindrical body having a first and a second end, an outer surface, opposing sides...http://www.google.de/patents/US5645598?utm_source=gb-gplus-sharePatent US5645598 - Spinal fusion device with porous material
