A medical drill is disclosed. The medical drill includes a drilling tool, a guiding element and a distance sensor. The drilling tool has a handle and a drill. The drill is connected to the handle. The guiding element has a reflecting part and is used to guide the drill. The distance sensor is set on the handle and relative to the guiding element. The distance sensor sends a wave to the reflecting part then the reflecting part reflects the wave to the distance sensor. The moving direction of the wave is parallel to the extending direction of the drill. In which the distance sensor calculates the displacement of the drill by measuring the distance between the handle and the guiding element.一種醫療用電鑽包含一鑽具、一導引件及一距離感測器。鑽具包含一把手及一鑽頭,鑽頭與把手連接。導引件具有一反射部,導引件用以導引鑽頭。距離感測器設置於把手,距離感測器與導引件相對,距離感測器發出一發射波至反射部,反射部將發射波反射回距離感測器,且發射波的行進方向與鑽頭的延伸方向平行。其中,距離感測器藉由量測把手與導引件之間的距離,來計算鑽頭之一位移距離。100...醫療用電鑽101...患部102...槽110...鑽具111...把手112...鑽頭120...導引件121...反射部130...距離感測器131...發射波
