An implant composed substantially of cortical bone is provided for use in cervical Smith-Robinson vertebral fusion procedures. The implant is derived from allograft or autograft cortical bone sources, is machined to form a symmetrically or asymmetrically shaped (e.g. a substantially “D”-shaped) implant...http://www.google.de/patents/US7048762?utm_source=gb-gplus-sharePatent US7048762 - Elongated cortical bone implant
