An interbody osteogenic fusion device is provided that includes opposite end pieces with an integral central element. The end pieces are sized to maintain the height of an intervertebral disc space. The central element has a much smaller diameter so that the osteogenic fusion device forms an annular...http://www.google.fr/patents/US7179293?utm_source=gb-gplus-shareBrevet US7179293 - Osteogenic fusion device
