FIELD: medical equipment. SUBSTANCE: apparatus has lung model (such as pneumatic model) with one outlet joined through connecting member to opening for connecting patient to ventilator and other outlet connected to device for measuring maximum and minimum inhalation pressure. This device is joined with its outlets to measurer of volume of respired gas. Maximum and minimum inhalation pressure measurer has pressure converter 5, amplifier 6, Pmax selection unit and Pmin selection unit. Measurer of volume of respired gas has subtraction unit (Pmax and Pmin), multiplication unit (Pmax and Pmin) x C, lung model extension setter, indicator of value of respired gas volume, and analog-to-digital converter. EFFECT: simplified construction and increased precision in measuring of volume of respired gas. 2 cl, 1 dwg
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