A spinal implant including a hollow body having a distal end, a proximal end, and a pair of lateral walls extending from the distal end to the proximal end, the lateral walls having concave, non-threaded interior surfaces for defining an at least partially cylindrical internal space between the lateral...http://www.google.fr/patents/US7056341?utm_source=gb-gplus-shareBrevet US7056341 - Two part intersomatic implant
