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Sensors 2013, 13(3), 3077-3091; doi:10.3390/s130303077
Article

A Low-Power Bio-Potential Acquisition System with Flexible PDMS Dry Electrodes for Portable Ubiquitous Healthcare Applications

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1 Instrumentation Chip Group, Department of Electric Engineering, National Cheng Kung University, 701 Tainan, Taiwan 2 Department of Bioengineering, University of California, Los Angeles, CA 90095, USA 3 Department of Electrical Engineering, Southern Taiwan University, 710 Tainan, Taiwan 4 Graduate Institute of Electrical Engineering, National Taipei University, 237 Taipei, Taiwan 5 Department of Electrical Engineering, National Chiao Tung University, 300 Hsinchu, Taiwan
* Author to whom correspondence should be addressed.
Received: 13 January 2013 / Revised: 15 February 2013 / Accepted: 28 February 2013 / Published: 4 March 2013
(This article belongs to the Section Physical Sensors)
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Abstract

This work describes a bio-potential acquisition system for portable ubiquitous healthcare applications using flexible polydimethylsiloxane dry electrodes (FPDEs) and a low-power recording circuit. This novel FPDE used Au as the skin contact layer, which was made using a CO2 laser and replica method technology. The FPDE was revised from a commercial bio-potential electrode with a conductive snap using dry electrodes rather than wet electrodes that proposed reliable and robust attachment for the purpose of measurement, and attaching velcro made it wearable on the forearm for bio-potential applications. Furthermore, this study proposes a recording device to store bio-potential signal data and provides portability and low-power consumption for the proposed acquisition system. To acquire differential bio-potentials, such as electrocardiogram (ECG) signals, the proposed recording device includes a low-power front-end acquisition chip fabricated using a complementary metal-oxide-semiconductor (CMOS) process, a commercial microcontroller (MSP430F149), and a secure digital (SD) card for portable healthcare applications. The proposed system can obtain ECG signals efficiently and are comfortable to the skin. The power consumption of the system is about 85 mW for continuous working over a 3 day period with two AA batteries. It can also be used as a compact Holter ECG system.
Keywords: dry electrode; PDMS; PMMA; bio-potential acquisition system; ECG dry electrode; PDMS; PMMA; bio-potential acquisition system; ECG
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.

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Chen, C.-Y.; Chang, C.-L.; Chang, C.-W.; Lai, S.-C.; Chien, T.-F.; Huang, H.-Y.; Chiou, J.-C.; Luo, C.-H. A Low-Power Bio-Potential Acquisition System with Flexible PDMS Dry Electrodes for Portable Ubiquitous Healthcare Applications. Sensors 2013, 13, 3077-3091.

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