A graft fixation system for fixing graft material in a bone tunnel includes an expandable fixation member having a graft receiving eyelet disposed proximate its distal end, opposed bone engaging elements disposed about its periphery, and an expansion plug receiving opening defined in its proximal end....http://www.google.de/patents/US7008451?utm_source=gb-gplus-sharePatent US7008451 - Expanding ligament graft fixation system and method
