Besides impedance method to measure respiratory parameters, what other methods are there and what are their advantages?

Breathing is one of the important parameters of human vital signs, and it is also a critical disease.

The basic parameters of the monitored human body are the basic tests configured by the multi-parameter monitor.

Quantitative function.

Breathing measurement methods generally include impedance method, thermal method and breathing method.

Gas concentration and respiratory gas flow method.

Impedance method is the first choice for respiratory monitoring of multi-parameter monitors. It borrows leads and electrodes from ECG monitoring, which is simple and effective and does not require additional expenses.

Method. However, in practical application, due to different design and evaluation, its performance is very different, which will affect clinical application.

Impedance method

Breathing is the spontaneous expansion and contraction of the human chest, which causes the impedance change of the chest. Impedance respiration measurement is based on this impedance change.

To achieve it. A constant current carrier current with high frequency (for example, 80 KHz sine wave) is introduced through a pair of electrodes attached to the chest and ECG leads, and then

Using these electrodes and wires, the carrier wave modulated by respiratory characteristics is electrified.

The pressure signal is introduced into the high-frequency amplifier circuit, and the call is resumed after demodulation and filtering.

Absorb the characteristic waveform, thus obtaining the respiratory signal.