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Sensors 2015, 15(8), 19618-19632; doi:10.3390/s150819618

A Low-Power and Portable Biomedical Device for Respiratory Monitoring with a Stable Power Source

1
School of Electronic Information Engineering, Tianjin University, 92 Weijin Road, Tianjin 300072, China
2
Shenzhen Institutes of Advanced Technology(SIAT), Chinese Academy of Science, Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Academic Editors: Hung Cao and Yu Zhao
Received: 13 June 2015 / Revised: 4 July 2015 / Accepted: 30 July 2015 / Published: 11 August 2015
(This article belongs to the Special Issue Power Schemes for Biosensors and Biomedical Devices)
View Full-Text   |   Download PDF [858 KB, uploaded 11 August 2015]   |  

Abstract

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. View Full-Text
Keywords: respiratory monitoring; low power; portability; modulation technology; flow measurement; CO2 concentration monitoring respiratory monitoring; low power; portability; modulation technology; flow measurement; CO2 concentration monitoring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Yang, J.; Chen, B.; Zhou, J.; Lv, Z. A Low-Power and Portable Biomedical Device for Respiratory Monitoring with a Stable Power Source. Sensors 2015, 15, 19618-19632.

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