一种便携式强迫振荡呼吸阻抗测试仪的设计与实现

Design and Implementation of a Portable Forced Oscillation Respiration Resistance Detector

本文介绍了一种界面友好可与医院联网的便携式强迫振荡呼吸阻抗测试系统。该系统采用STM32产生单频率或复频率的正弦振荡信号,经放大电路放大后驱动扬声器产生正弦振荡气流于受试者口腔中,应用STM32的模数据转换器(ADC)模块分别测量由压力传感器和流量传感器得到的模拟电压信号,再经运算后将得到的参数显示在触摸显示屏上,同时可通过GPRS将数据上传到上位机进行保存和显示。最后使用模拟肺和征集志愿者等方式来评价该系统的可靠性。测试结果表明该系统稳定可靠,可以达到监测呼吸阻抗状况的目的。

This paper proposes a forced oscillation respiration resistance detector which has the characteristics of port- able and friendly interface, with remote transmission function, STM32 is used to produce single frequency or com- plex frequency oscillation signal. In the experiments, the signal was magnified by the power amplifier to drive speaker to generate oscillates airflow into the subject＇s oral cavity. The analog to digital coverter of STM32 was used to measure the signals obtained by the pressure sensor and the flow sensor, and then the operation parameters were to be displayed on the TFT-LCD touch screen, and could also he transferred to the master computer. Simulated lung and volunteerism were used to verify the reliability of the detector. The test results showed that the system was reli- able, and it achieved the significance in respiratory impedance detecting.