Method for Synchronous Monitoring of Mainstream Breathing Carbon Dioxide Concentration and Breathing Flow

Abstract

The invention belongs to the field of biomedical engineering, and relates to a method for synchronously monitoring the concentration of carbon dioxide and breath flow amount in a main flow mode. The method comprises the steps that a sensor is made to output modulation light source signals with a fixed cycle by controlling flashing of a light source; a measurement channel voltage of an infrared sensor, a reference channel voltage of the infrared sensor and the voltage of a differential pressure sensor are obtained; for monitoring of breathed carbon dioxide, a measurement channel alternating component and a reference channel alternating component are extracted respectively according to the difference between the peak value and the valley value of the two channel collecting voltages of the infrared sensor; the concentration of the currently breathed carbon dioxide is calculated; the current breath flow amount is determined; the starting point of a breath cycle is determined; the current breath frequency value is calculated; whether the process is an exhale process or an inhale process is determined; the lung capacity value and the vital capacity are calculated. The method can accurately and reliably achieve synchronous monitoring of the concentration of the breathed carbon dioxide and breath pressure.

Description

Technical field: [0001] The invention belongs to the field of biomedical engineering, and relates to a mainstream method for synchronous monitoring of carbon dioxide concentration and respiratory flow in human breathing. Background technique: [0002] The monitoring of human respiratory carbon dioxide concentration and respiratory flow is an important part of medical monitoring, which provides important guidance for disease diagnosis and clinical monitoring. At present, the monitoring of human respiratory flow is mainly carried out in high-end ventilators. The equipment is bulky, expensive, and the scope of use is limited to intensive care units. Respiratory carbon dioxide concentration monitoring can be divided into mainstream type and side flow type. The mainstream type avoids the delay and distortion problems of the side flow type because it is directly monitored on the patient's pipeline adapter. However, the mainstream type monitoring is limited by the use environment. ...

AI Technical Summary

Problems solved by technology

[0003] The present invention overcomes the problems that the existing mainstream respiratory carbon dioxide concentration monitoring is easily interfered by respiratory airflow, flow monitoring has time delay and distortion, and the two kinds of monitoring are not synchronized, etc., and provides a truly mainstream integrated monitoring method.

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