Laitteisto ja menetelmä hengityskaasuvirtauksen seurantaan

An apparatus for monitoring a respiratory gas flow, comprising a gas collector unit (8), which separates an ambient gas space from that remaining inside the gas collector unit and in which a patient respires the gas contained in said gas collector unit. A conduit (7) flows a respiratory gas from one or more gas sources (1) into the gas collector unit (8) to be respired by a patient, and a conduit (14) delivers a respiratory gas, which at least partially contains a gas exhaled by a patient, from the gas collector unit (8) to a measuring device (13) for examination. The pressure difference between a gas space protected by the gas collected unit and a gas space existing outside it is indicated by a pressure-difference detecting element (17). A method for monitoring a respiratory gas flow compares the pressure of a respiratory gas existing inside the gas collector unit (8) with that prevailing outside the gas collector unit and adjust gas flows accordingly.