A tool is provided for use with a bone anchor, wherein the bone anchor has an anchoring section and a receiving part (109) for receiving a rod (103) to be connected to the anchoring section and a locking element (108), the tool comprising a tip portion (20) for engaging the locking element, a mechanism to apply torque to the tip portion, a counter-holding portion (6) for engaging the receiving part, wherein the tip portion is rotatable with respect to the counter-holding portion, characterized in that the mechanism to apply torque comprises a gear unit (5).本案提供一種骨骼固定器用之工具,其中骨骼固定器具有固定段,和容納桿件(103)用之容納件(109),待連接於固定段和鎖定元件(108),工具包括尖端部(20),供結合鎖定元件,一種對尖端部施以扭矩的機制,結合容納件用之抗衡保持部(6),其中尖端部可就抗衡保持部轉動,其特徵為施以扭矩之機制,包括齒輪單位(5)。1...驅動軸3...手柄4...罩殼5...減速齒輪單位6...抗衡保持部7...手柄8...顯示構件9...目視標誌101...骨骼固定器103...桿件
