An intervertebral implant in the form of a support unit with a central yoke and four legs extending in a direction is described. The legs are configured in two substantially mutually parallel planes spaced apart by the yoke and are abuttable as support surfaces against adjacent vertebrae. A guide cylinder...http://www.google.de/patents/US6443990?utm_source=gb-gplus-sharePatent US6443990 - Adjustable intervertebral implant
