System training and assessment in simultaneous proportional myoelectric prosthesis control

Journal article


Anders L. Fougner, Oyvind Stavdahl and Kyberd, P. 2014. System training and assessment in simultaneous proportional myoelectric prosthesis control. Journal of NeuroEngineering and Rehabilitation. Vol 11 (Issue 1), p. 75. https://doi.org/10.1186/1743-0003-11-75
AuthorsAnders L. Fougner, Oyvind Stavdahl and Kyberd, P.
Abstract

Background: Pattern recognition control of prosthetic hands take inputs from one or more myoelectric sensors and controls one or more degrees of freedom. However, most systems created allow only sequential control of one motion class at a time. Additionally, only recently have researchers demonstrated proportional myoelectric control in such systems, an option that is believed to make fine control easier for the user. Recent developments suggest improved reliability if the user follows a so-called prosthesis guided training (PGT) scheme.

Methods: In this study, a system for simultaneous proportional myoelectric control has been developed for a hand prosthesis with two motor functions (hand open/close, and wrist pro-/supination). The prosthesis has been used with a prosthesis socket equivalent designed for normally-limbed subjects. An extended version of PGT was developed for use with proportional control. The control system's performance was tested for two subjects in the Clothespin Relocation Task and the Southampton Hand Assessment Procedure (SHAP). Simultaneous proportional control was compared with three other control strategies implemented on the same prosthesis: mutex proportional control (the same system but with simultaneous control disabled), mutex on-off control, and a more traditional, sequential proportional control system with co-contractions for state switching.

Results: The practical tests indicate that the simultaneous proportional control strategy and the two mutex-based pattern recognition strategies performed equally well, and superiorly to the more traditional sequential strategy according to the chosen outcome measures.

Conclusions: This is the first simultaneous proportional myoelectric control system demonstrated on a prosthesis affixed to the forearm of a subject. The study illustrates that PGT is a promising system training method for proportional control. Due to the limited number of subjects in this study, no definite conclusions can be drawn.

KeywordsElectromyography; Prosthesis guided training; Estimation; Myoelectric control; Proportional control; Prosthetic hand; Prosthetics
Year2014
JournalJournal of NeuroEngineering and Rehabilitation
Journal citationVol 11 (Issue 1), p. 75
PublisherBMC (Springer Nature)
ISSN17430003
Digital Object Identifier (DOI)https://doi.org/10.1186/1743-0003-11-75
Web address (URL)https://puredev.port.ac.uk/en/publications/9ff19444-2dcb-41fb-b87b-4bf2d15fc640
Output statusPublished
Publication dates28 Apr 2014
Publication process dates
Accepted17 Apr 2014
Deposited01 Jun 2023
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