Patent ID: 7594931

Claim:
Intervertebral arthrodesis device having a size and shape for insertion in an intervertebral space separating opposite faces of two adjacent vertebrae comprising at least one intervertebral cage substantially in the shape of a ring which may be open along a side and having a bar adapted to extend perpendicular to the axis of the spine when the arthrodesis device is inserted in the intervertebral space, the bar having a height less than another portion of the cage, and a fixation structure for securing the at least one cage to at least one of the vertebrae, the fixation structure being arranged to be added to the at least one intervertebral cage by inserting a projecting part of the fixation structure through at least one opening extending along the bar, the fixation structure including at least two locking studs with approximately parallel axes connected by a small rod, the locking studs being insertable into at least one opening of at least one intervertebral cage to lock the fixation structure to the cage and to keep the cage in position in the intervertebral space, and at least one of the ends of the small rod has at least one protuberance clipped in at least one housing arranged in the wall of the intervertebral cane for limiting or preventing movements of said rod relative to said cage.