The invention discloses a
pressure monitoring and controlling method used in an aerating
system of a
medical device. The
pressure monitoring and controlling method comprises monitoring the confining pressure of an
expiratory valve on a real-time basis, and regulating and maintaining the pressure and the set confining pressure of the
expiratory valve at the same value; and monitoring the pressure of a patient terminal gas channel on a real-time basis, and regulating and maintaining the pressure to reach a set control pressure. The aerating
system used in the medical facility comprises a gas
path system and a
pressure monitoring and controlling device. The pressure monitoring and controlling device comprises a parameter monitoring and controlling unit, a valve
control unit and a
master controller, wherein the parameter monitoring and controlling unit includes a first pressure detecting device placed in to the patient terminal gas channel in the gas
path system, and a second pressure detecting device for monitoring and controlling the confining pressure of the
expiratory valve in the gas
path system. A
breathing machine and an anaesthetic
machine using the aerating
system in the technical proposal monitor the pressure of a control
branch of the expiratory valve therein and employ the pressure as the basis of the
feedback control to effectively avoid the external disturbance, thereby realizing stable and reliable
pressure control.