A disc implant is provided which maintains intervertebral spacing and stability of the spine. In an embodiment, a disc implant may include four or more components. Components of the disc implant may include engaging plates and two or more members positioned between the engaging plates. In certain embodiments,...http://www.google.es/patents/US20040133278?utm_source=gb-gplus-sharePatente US20040133278 - Spinal disc implant
