A prosthetic disc for insertion between adjacent vertebrae includes upper and lower plates and a core having upper and lower curved surfaces disposed between the plates. At least one of the plates and/or the core includes a resilient material for absorbing shock or other forces applied by vertebrae....http://www.google.de/patents/US20060178744?utm_source=gb-gplus-sharePatent US20060178744 - Intervertebral prosthetic disc with shock absorption
