Patent ID: 8776791

Claim:
A respirator, comprising: an inspiratory valve to deliver driving gas from an external gas supply source to drive one or more gases to a patient during a medical treatment procedure; a bellows including a container therein to which a pressure is applied by the driving gas, which enters the bellows to compress the one or more gases in the container in order to discharge the one or more gases through a breathing circuit between the container and a discharge end to the patient who is undergoing the medical treatment procedure; a flow measuring component that is situated near the discharge end near the patient in the breathing circuit to detect a first flow rate of the one or more gases provided for inhalation or an exhaled gas flow rate of an exhaled gas from the patient and to provide one or more respiration parameters of the patient; a flow measuring reference component that is provided between the inspiratory valve and the container to detect a second flow rate of the driving gas, wherein the flow measuring reference component sends a first signal in response to at least one of the one or more respiration parameters measured by the flow measuring component to a processing circuit that issues a second signal to cause a control circuit to issue one or more control signals comprise a control signal to calibrate and adjust an opening of the inspiratory valve during the medical treatment procedure based at least in part upon the second flow rate of the driving gas and the first flow rate of the one or more gases and a warning signal to indicate that the flow measuring component is not functioning correctly when the flow measuring component malfunctions.