Respiratory flow determining system for use in e.g. medical care centre, has processor determining respiratory flow of patient by subtraction of total air flow from product of constant and square root of pressure

摘要

The system has a respiratory device defining a respiration zone. A flow sensor (120) measures total air flow in the zone, when exhale of a patient (20) has stopped. A pressure sensor (130) is used for measuring the pressure in the zone. A processor determines a constant representing a flow correction factor by division of measured total air flow by square root of the measured pressure. The processor determines a respiratory flow of a patient by subtraction of total air flow from product of the constant and square root of the pressure.