A system for controlling urination in a patient includes an implantable controller and an external device. The implantable controller includes circuitry and electrodes for stimulating the pudenal nerves in order to control urination. In addition, the implantable controller includes sensors for determining information on bladder fullness and for transmitting such information to an external device which is used for controlling the implanted controller. The external device will display when bladder filling exceeds a safe threshold level, allowing the patient and a caregiver to take appropriate steps to allow the patient to urinate.