Abstract: A ureteroscope system including a handpiece, a catheter, one or more sensors, and a processor is described. The handpiece includes a working channel port and a working channel in fluid communication with the working channel port. The catheter is secured to the handpiece and includes a distal end defining a working channel opening in fluid communication with the working channel. The one or more sensors are positioned and configured to detect a position of at least a portion of a laser fiber. The processor is configured to determine if an emitting end of the laser fiber configured to emit laser light is outside the working channel and spaced at least a predetermined distance from the distal end of the catheter.