Abstract: A quick disconnect connector for use with a system for measuring depth of anaesthesia of a patient. For this purpose, a probe is attached to a patient to detect esophageal contractions. The probe is connected to a patient station by means of flexible tri-lumen tubing. The patient station provides a pressure transducer, a source of pressurized air, and a thermistor connection, and in turn is operatively connected to a microprocessor which controls the entire operation. One conduit of the tubing enables communication between a liquid filled balloon within the probe and the transducer at the patient station. Another conduit enables an air balloon within the probe to be connected to the source of pressurized air. Still another conduit receives the electrical lead which extends to the thermistor.