A Low-Power and Portable Biomedical Device for Respiratory Monitoring with a Stable Power Source.
Continuous respiratory monitoring is an important tool for clinical monitoring. Associated with the development of biomedical technology, it has become more and more important, especially in the measuring of gas flow and CO2 concentration, which can reflect the status of the patient. In this paper, a new type of biomedical device is presented, which uses low-power sensors with a piezoresistive silicon differential pressure sensor to measure gas flow and with a pyroelectric sensor to measure CO2 concentration simultaneously. For the portability of the biomedical device, the sensors and low-power measurement circuits are integrated together, and the airway tube also needs to be miniaturized. Circuits are designed to ensure the stability of the power source and to filter out the existing noise. Modulation technology is used to eliminate the fluctuations at the trough of the waveform of the CO2 concentration signal. Statistical analysis with the coefficient of variation was performed to find out the optimal driving voltage of the pressure transducer. Through targeted experiments, the biomedical device showed a high accuracy, with a measuring precision of 0.23 mmHg, and it worked continuously and stably, thus realizing the real-time monitoring of the status of patients.
School of Electronic Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China. yangjiachen@tju.edu.cn.
Jiachen
J
Yang
School of Electronic Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China. chenjunbo2014@tju.edu.cn.
Bobo
B
Chen
School of Electronic Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China. zhoujx@tju.edu.cn.
Jianxiong
J
Zhou
Shenzhen Institutes of Advanced Technology(SIAT), Chinese Academy of Science, Shenzhen 518055, China. lvzhihan@gmail.com.
Zhihan
Z
Lv
D002245:Carbon Dioxide / Q000032:analysis; D011211:Electric Power Supplies; D004560:Electricity; D004864:Equipment and Supplies; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D011312:Pressure; D012119:Respiration; D012815:Signal Processing, Computer-Assisted
D002245:Carbon Dioxide
CO2 concentration monitoring; flow measurement; low power; modulation technology; portability; respiratory monitoring