A spinal fixation device comprises an intervertebral body wedge which is inserted between vertebral bodies by sequentially expanding the inter-discal space using a spacer. With this sequential expansion, no posterior fixation devices are needed for stabilization of the spinal diseased vertebrae....http://www.google.es/patents/US6468276?utm_source=gb-gplus-sharePatente US6468276 - Spinal fixation device and method
