The present disclosure relates to a ureteroscope (100) and a method for dusting stones in a body cavity with a laser fiber (140). The ureteroscope (100) includes a flexible probe (105) and a handle (110). The flexible probe (105) includes a working channel (135) that accommodates the laser fiber (140) in a distal end (120) of the flexible probe (105) at a working position to be deflected against a target stone for dusting. The handle (110) includes a plurality of control switches and a laser fiber (140) feeder and retraction module (305). The control switches are configured to provide digital control signals to control a motor (325) assisted movement of the laser fiber (140) in the working channel (135). The motor (325) assisted movement of the laser fiber (140) includes one of a feeding movement and a retracting movement. The laser fiber feeder and retraction module is configured to control one of the feeding movement and the retracting movement of the laser fiber (140) in the working channel (135).
