Abstract
Myoelectric prostheses assist users to live their daily lives. However, the majority of users are primarily confined to forearm amputees because the surface electromyography (sEMG) that understands the motion intents should be acquired from a residual limb for control of the myoelectric prosthesis. This study proposes a novel fabric vest socket that includes embroidered electrodes suitable for a high-level upper amputee, especially for shoulder disarticulation. The fabric vest socket consists of rigid support and a fabric vest with embroidered electrodes. Several experiments were conducted to verify the practicality of the developed vest socket with embroidered electrodes. The sEMG signals were measured using commercial Ag/AgCl electrodes for a comparison to verify the performance of the embroidered electrodes in terms of signal amplitudes, the skin-electrode impedance, and signal-to-noise ratio (SNR). These results showed that the embroidered electrodes were as effective as the commercial electrodes. Then, posture classification was carried out by able-bodied subjects for the usability of the developed vest socket. The average classification accuracy for each subject reached 97.92%, and for all the subjects it was 93.2%. In other words, the fabric vest socket with the embroidered electrodes could measure sEMG signals with high accuracy. Therefore, it is expected that it can be readily worn by high-level amputees to control their myoelectric prostheses, as well as it is cost effective for fabrication as compared with the traditional socket.
Highlights
In recent years, there has been a growing interest in myoelectric prostheses, especially, the upper limb, including hand, arm, and shoulder, which is one of the important factors, when doing physical activity
This paper presents the fabric vest socket including the embroidered electrodes for myoelectric prosthesis control of shoulder disarticulation
The developed vest socket carries out design for fabrication, EMG signal performance, skin-electrode impedance, and posture classification
Summary
There has been a growing interest in myoelectric prostheses, especially, the upper limb, including hand, arm, and shoulder, which is one of the important factors, when doing physical activity. In the United States, approximately 3000 people have undergone the loss of an upper limb every year, which has continually increased [1,2]. Amputees in their 20s and 60s occupy approximately 60% of the entire number, and men represent a greater percentage than women [1,3,4]. A myoelectric prosthesis has brought a lot of changes to amputees It is usually based on surface electromyography (sEMG), which is a method used to obtain the electrical activity of the muscles under the skin surface. The sEMG signal has been actively used when finding out people’s motion intentions
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