Jiachen Yang

Accurate and stable continuous monitoring module by mainstream capnography

End-tidal partial pressure of

A new single-end mainstream CO2 capnograph

hbox{CO}_2;(hbox{P}_{ET}hbox{CO}_2)

A new real-time and precision capnography for human respiration carbon dioxide concentration.

CO2(PETCO2) is an important index in clinical monitoring. Medical mainstream capnography has become widely used, but there are still limitations in accuracy and stability. A type of mainstream capnometer based on the principle of non-dispersive infrared was designed. This capnometer inhibits signal drift by using electric modulation and thus ensures the accuracy of long-term CO2 monitoring. Statistical methods are used to find the best setting for sampling respiratory signals and improving precision. Several digital filtering techniques are used to process various interferences and improve capnogram quality. Clinical tests and targeted experiments show this mainstream capnometer can accurately monitor respiratory CO2 concentrations, especially at the end-tidal peak point. This capnometer also shows high accuracy and stability in long-term continuous monitoring.

Main stream-type carbon dioxide concentration measurement device

End-tidal carbon dioxide (P(ET)CO₂) monitoring has become an important tool in clinical monitoring, but there are still limitations in practice. Low-frequency modulation was used to reliably acquire respiratory information. Then the disturbances of humidity and flow rate were removed by signal decomposition. Finally, the real-time concentration of CO₂ was calculated and displayed by an adjusted calibration function. Targeted experiments confirm that a period of 180 ms and a depth of 50% was the optimal choice. In this case, the effects of humidity and flow rate reflected by different components were removed effectively from the capnography. This capnometer obtains capnography with excellent accuracy and stability in long-term continuous monitoring.

Stereo image objective quality evaluation algorithm based on GSSIM

Most of the current mainstream respiratory devices for monitoring CO2 concentration use the two-end structure combined with both reference-end and main testing-end. In this paper, we design a new single-end mainstream device for monitoring the carbon dioxide concentration that is breathed out of the human body. In this single end design, only the main testing-end will be involved. The mechanism is based on the low-cost digital processing method of blind source separation, which is used to separate the signal and then extract the reference signal. Meanwhile, in order to decrease the negative influence of device noise and the low sample precision caused by temperature drift, two steps are taken: one is wavelet denoising and the other is temperature drift compensation. These two steps are proved valid by clinical trials, thus improving the accuracy of devices.

Wavelet filteration method for muting carbon dioxide concentration detection signal

Most of the current respiratory devices for monitoring CO(2) concentration use the side-stream structure. In this work, we engage to design a new double-end mainstream device for monitoring CO(2) concentration of gas breathed out of the human body. The device can accurately monitor the cardiopulmonary status during anesthesia and mechanical ventilation in real time. Meanwhile, to decrease the negative influence of device noise and the low sample precision caused by temperature drift, wavelet packet denoising and temperature drift compensation are used. The new capnograph is proven by clinical trials to be helpful in improving the accuracy of capnography.

Image processing method based on binocular stereoscopic psychological perception

This paper is a description of the designing of a new mainstream device to measure human respiration carbon dioxide concentration, based on non-dispersive infrared (NDIR) absorption technology. The device can be used to accurately monitor the cardiopulmonary status during anaesthesia and mechanical ventilation in real time. This new device can not only make up the error of real-time gas measurement of the side-stream device, but also make up the accuracy of the main-stream device. In the paper, four issues which can affect the measurement accuracy were considered: respiration gas flow, turbulence of the light source with all ranges of wavelength, temperature drift and signal noise. The experimental results showed that the device could produce a stable output signal and deviation of measurement accuracy could be achieved to within 4%.This paper is a description of the designing of a new mainstream device to measure human respiration carbon dioxide concentration, based on non-dispersive infrared (NDIR) absorption technology. The device can be used to accurately monitor the cardiopulmonary status during anaesthesia and mechanical ventilation in real time. This new device can not only make up the error of real-time gas measurement of the side-stream device, but also make up the accuracy of the main-stream device. In the paper, four issues which can affect the measurement accuracy were considered: respiration gas flow, turbulence of the light source with all ranges of wavelength, temperature drift and signal noise. The experimental results showed that the device could produce a stable output signal and deviation of measurement accuracy could be achieved to within 4%.