Abstract
We developed an intuitively operational shoulder disarticulation prosthesis system that can be used without long-term training. The developed system consisted of four degrees of freedom joints, as well as a user adapting control system based on a machine learning technique and surface electromyogram (EMG) of the trunk. We measured the surface EMG of the trunk of healthy subjects at multiple points and analyzed through principal component analysis to identify the proper EMG measurement portion of the trunk, which was determined to be distributed in the chest and back. Additionally, evaluation experiments demonstrated the capability of four healthy subjects to grasp and move objects in the horizontal as well as the vertical directions, using our developed system controlled via the EMG of the chest and back. Moreover, we also quantitatively confirmed the ability of a bilateral shoulder disarticulation amputee to complete the evaluation experiment similar to healthy subjects.
Highlights
Upper-limb prostheses are wearable instruments that are used to reconstruct the lost exercise function and appearance of upper limbs (Bandara et al, 2012)
The purpose of this study is to develop an intuitively operational powered shoulder disarticulation prosthesis that can be implemented without the use of surgery and can be used without long-term training, while being controlled by a trunk electromyogram
In an earlier experiment, a resting period of 9 months and a practice time of 100 h were required after the operation
Summary
Upper-limb prostheses are wearable instruments that are used to reconstruct the lost exercise function and appearance of upper limbs (Bandara et al, 2012). The prosthesis corresponding to the shoulder defect is known as the shoulder disarticulation prosthesis (ISO9999 06.18.18). A majority of these shoulder disarticulation prosthesis enable the user to manually control the elbow and hand movements via the wire, which is known as body-powered shoulder disarticulation prosthesis. The range of motion and muscular strength of the user limits its performance. A sufficient grasping force is necessary to stably hold the items used in daily life. The body-powered shoulder disarticulation prosthesis has high user expectation
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