It is mainly used to connect with a suitable neuro monitor to provide an unobstructed airway for patients and act as an instrument for intraoperative monitoring of muscle and neuro activity in the larynx. Each catheter is equipped with four stainless steel wire contact electrodes for easy access to vocal cords. The electrodes are designed to be in contact with the patient’s vocal cords to facilitate EMG monitoring of the vocal cords during the operation while connected to a multi-channel EMG monitoring device.