EXPIRATION PRESSURE DETECTOR

PROBLEM TO BE SOLVED: To efficiently detect expiration pressure, to reduce the feeling of fatigue without breathing in and out more than necessary and to enable many hours of use by setting a large space near a pressure detector and a small space away from the pressure detector and providing a continuous curve therebetween. SOLUTION: For a patient with the pharynx extracted, a mouth and a trachea 12 are separated from each other by an operation, and a hole for excusive use for breathing which is called a trachea hole 11 is provided. Then, for detecting breathing pressure, an expiration pressure detector 10 is slightly pressed on the trachea 11, a valve is opened by sucking when breathing, and breathing is performed through a route 13. When breathing out, by pushing the valve to open, breathed air having no destination is clashed with an inner wall. However, when a direction having the pressure detector is deep, a direction having no detectors is shallow and a continuous curve is provided therebetween, since a breathing pressure is guided smoothly through the route to the pressure detector rather than temporarily stopped, expiration pressure is efficiently detected with a very small loss.