Method for synchronously monitoring breath pressure and concentration of carbon dioxide in main flow mode

Abstract

The invention belongs to the field of biomedical engineering, and relates to a method for synchronously monitoring breath pressure and the concentration of carbon dioxide in a main flow mode. The method comprises the steps that a double-channel infrared sensor is made to output modulation signals with a fixed cycle by controlling flashing of a light source; a measurement channel voltage and a reference channel voltage of the double-channel infrared sensor and an output value of an absolute pressure type gas pressure sensor are obtained; for monitoring of the breathed carbon dioxide, a measurement channel alternating component and a reference channel alternating component are extracted respectively by utilizing the difference between the peak value and the valley value of the measurement channel voltage; the concentration of the currently breathed carbon dioxide is determined through the difference between the two channel alternating components and a pre-fit formula; the current breath pressure is determined through the output value of the gas pressure sensor according to an advance calibration experiment and a formula determined by fitting of a second-order polynomial; the real-time speed and the breath flow amount of breathed gas flow are obtained; the lung capacity is obtained. The method can conveniently and rapidly achieve synchronous monitoring of breath pressure and the concentration of the breathed carbon dioxide.

Description

Technical field: [0001] The invention belongs to the field of biomedical engineering, and relates to a mainstream method for synchronous monitoring of human breathing air pressure and breathing carbon dioxide concentration. Background technique: [0002] The monitoring of human respiratory pressure and respiratory carbon dioxide concentration is an important part of medical monitoring, which provides important information for clinical monitoring and disease diagnosis. At present, respiratory air pressure monitoring is mainly done in intensive care units with high-end ventilators, which are bulky, expensive and difficult to apply in portable monitoring equipment. Respiratory carbon dioxide concentration monitoring can be divided into mainstream type and side flow type. The mainstream type monitors directly on the patient's breathing tube, avoiding the delay and distortion of the side flow type, but it is easily interfered by water vapor and excrement in the breath. . Respir...

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes that the existing mainstream monitoring of respiratory carbon dioxide concentration is easily interfered by respiratory air flow and the scope of use of respiratory air pressure monitoring is limited, and provides a convenient and quick method for synchronous monitoring of respiratory air pressure and respiratory carbon dioxide concentration.

Images