Gauge blocks or plugs and permanent implant plugs are provided for surgical procedures to support and fuse together adjacent vertebrae in a vertebral column. The plugs are rectangular with tapered front ends and tool receiving rear ends. The gauge blocks are smooth faced for removal but the implant plugs...http://www.google.fr/patents/US4834757?utm_source=gb-gplus-shareBrevet US4834757 - Prosthetic implant
