Wearable Active Electrode for sEMG Monitoring Using Two-Channel Brass Dry Electrodes with Reduced Electronics

Autor: J. Antonio Ruvalcaba, Lorenzo Leija, Arturo Vera, M. I. Gutierrez
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Adult
Male
Wrist Joint
Medicine (General)
Materials science
Article Subject
Movement
0206 medical engineering
Biomedical Engineering
Wearable computer
Health Informatics
02 engineering and technology
Brass
Wearable Electronic Devices
R5-920
0202 electrical engineering
electronic engineering
information engineering
Electric Impedance
Medical technology
Humans
Electronics
R855-855.5
Electrical impedance
Electrodes
Electromyography
Communication
020208 electrical & electronic engineering
Bandwidth (signal processing)
Reproducibility of Results
Electroencephalography
Signal Processing
Computer-Assisted
Repeatability
Active electrode
Wrist
020601 biomedical engineering
Zinc
visual_art
Electrode
visual_art.visual_art_medium
Surgery
Female
Gels
Copper
Biotechnology
Biomedical engineering
Research Article
Zdroj: Journal of Healthcare Engineering, Vol 2020 (2020)
Journal of Healthcare Engineering
ISSN: 2040-2309
2040-2295
Popis: Gel-based electrodes are employed to record sEMG signals for prolonged periods. These signals are used for the control of myoelectric prostheses, clinical analysis, or sports medicine. However, when the gel dries, the electrode-skin impedance increases considerably. Using dry active electrodes (AEs) to compensate variations of impedance is an alternative for long-term recording. This work describes the optimization of the electronic design of a conventional AE by removing the impedance coupling stage and two filters. The proposed work consisted of 5 stages: electrodes, amplification (X250), 2.2 Vdc offset, low-pass filter, and ADC with USART communication. The device did not need the use of electrolytic gel. The measurements of CMRR (96 dB), amplitude of the output sEMG signal (∼1.6 Vp-p), and system bandwidth (15–450 Hz) were performed in order to confirm the reliability of the device as an sEMG signal acquisition system. The SNR values from seven movements performed by eleven volunteers were compared in order to measure the repeatability of the measurements (average 30.32 dB for a wrist flexion). The SNR for wrist flexion measured with the proposed and the commercial system was compared; the values were 49 dB and 60 dB, respectively.
Databáze: OpenAIRE
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