Method by determination of the functional residual capacity of lungs and a ventilator device for the determination of the functional residual capacity.

摘要

The invention describes a method and a ventilator device for measuring the functional residual capacity, FRC, of lungs. A trace gas is mixed with a breathing gas in a gas mixer (14) and fed into the lungs (8) via an inspiratory tube (6). When a predetermined concentration of trace gas is achieved in the lungs (8), the supply of trace gas is stopped, and a washout phase starts. During the washout phase, the concentration of trace gas in expired gas and the flow of expired gas are measured. The measurement values are sent to an analyzer (18) which calculates the volume of trace gas in the lungs (8). Functional residual capacity can then be determined from the calculated volume of trace gas. The trace gas is appropriately SF6. <IMAGE>