The present disclosure relates to a ureteroscope and a method for dusting stones in a body cavity with a laser fiber. The ureteroscope includes a flexible probe and a handle. The flexible probe includes a working channel that accommodates the laser fiber in a distal end of the flexible probe at a working position to be deflected against a target stone for dusting. The handle includes a plurality of control switches and a laser fiber feeder and retraction module. The control switches are configured to provide digital control signals to control a motor assisted movement of the laser fiber in the working channel. The motor assisted movement of the laser fiber 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 in the working channel.
