A tension screw of the type primarily intended for anchoring one end of a ligament graft to a bone during surgery to repair a damaged or torn ligament. The tension screw includes two principal elements: a cannulated screw and a bone screw which is insertable through the longitudinal bore of...http://www.google.co.uk/patents/US5702398?utm_source=gb-gplus-sharePatent US5702398 - Tension screw
