INTRATHORACIC PRESSURE CALCULATION DEVICE AND INTRATHORACIC PRESSURE CALCULATION METHOD

摘要

An intrathoracic pressure calculation device acquires a pulse wave signal (S230), and an intraoral pressure signal, which represents the magnitude of the intraoral pressure of a subject when the subject is breathing at different depths along a time axis, the intraoral pressure signal being correlated with the pulse wave signal along the time axis (S210). The ratio of the degree of variation in the amount of change from a second reference value, which is a preset amplitude of the pulse wave signal, to the degree of variation in the amount of change from a first reference value, which is a preset intraoral pressure expressed by the intraoral pressure signal, is calculated as the calibration factor on the basis of the acquired intraoral pressure signal and pulse wave signal (S260, S270). The predicted intrathoracic pressure, which is the relative value of the intrathoracic pressure predicted on the basis of the pulse wave signal, is multiplied by the calibration factor to calculate the absolute value of the intrathoracic pressure of the subject.