A vertebral shock absorber in the form of an elongated compressible member having two ends, one fastened to an upper vertebra, and the other fastened to a lower vertebra. The elongated member may be fastened using pedicle screws or by way of ball-and-socket joints for enhanced range of motion. In the...http://www.google.es/patents/US20050261682?utm_source=gb-gplus-sharePatente US20050261682 - Vertebral shock absorbers
