The invention discloses a device for noninvasively detecting the level of
carbon dioxide in
human blood. The device comprises a blowing
nozzle, a prolonged expiration induction device for a user to conveniently expire, an
infrared adapter window body, a
signal detection
processing device and a terminal, wherein the prolonged expiration induction device is used for providing expiration
positive pressure, limiting flow velocity and inducing the continuous prolonged expiration of
expired gas; the
infrared adapter window body is used for a detection
gas chamber of the
expired gas, and detection
infrared rays pass through the infrared adapter window body; the
signal detection
processing device is used for emitting the detection infrared rays to the infrared adapter window body, and detecting the CO2
partial pressure of the
expired gas; the terminal is used for receiving,
processing and displaying the data of the
signal detection processing device. According to the device, the prolonged expiration induction device can be used for providing expiration
positive pressure and limiting the flow velocity, so that a patient can be helped to conveniently prolong the
expiration time and improve expiration effects; with the use of the prolonged expiration induction device, the flow velocity and pressure of the expired gas are regular, the measurement
standardization degree of a testee (patient) is favorably improved, and the consistency of a measurement result is ensured.