IMPROVED DEVICE FOR DETERMINING AIR PATHWAY RESISTANCE BY USING VIBRATION METHOD

摘要

PURPOSE: To enable supplying an accurate result from a simplified structure and operation by providing the system with a computation unit with which calculates an air passage impedance from the total impedance consisting of the corrected reference impedance of the air hose extending from the mouthpiece and the air passage impedance of a patient. CONSTITUTION: On one hand the oscillation supplied into the corrected air hose 5 by way of a connection 4 by a pump 1 passes inside the corrected air hose 5 and on the other hand passes through a patient's breathing system 3. Thus, the corrected air hose, that is, reference impedance 'Zref' and the patient' s impedance 3, that is, the air passage impedance 'Zaw', are connected in a parallel circuit. Further, a mouthpiece 2, in the same manner, having the connection point of a measurement hose 7 extending to a pressure detector 9 which is composed of a microphone, gives the quantity of the total impedance 'Zges' of the entire system in the format of analog signal 'y' after correction. In addition, as an analog signal 'x', the phase measurement 10 provides a phase angle of total impedance 'Zges'.