A method for identifying a ureter during a medical procedure, the method comprising: providing an electrical stimulator comprising: a shaft having at least one electrode； and a power supply connected to the at least one electrode for providing an electrical signal to the at least one electrode； advancing the shaft so that the at least one electrode contacts tissue； operating the power supply so that the electrical signal is applied to the tissue； and visually observing the tissue to determine the presence of a ureter in the tissue.
