Disclosed are methods and devices for accessing and treating the spine, while minimizing trauma to surrounding tissue. A device is introduced through tissue, to an access point on the spine. The device is thereafter advanced axially within the spine, from the access point across a treatment zone. In...http://www.google.es/patents/US7727263?utm_source=gb-gplus-sharePatente US7727263 - Articulating spinal implant
