A classification method for myoelectric control of hand prostheses inspired by muscle coordination

Gauravkumar K. Patel, Claudio Castellini, Janne M. Hahne, Dario Farina, Strahinja Dosen

Research output: Contribution to journalJournal articleResearchpeer-review

28 Citations (Scopus)
479 Downloads (Pure)

Abstract

Dexterous upper-limb myoelectric prostheses can, to some extent, restore the motor functions lost after an amputation. However, ensuring the reliability of myoelectric control is still an open challenge. In this study, we propose a classification method that exploits the regularity in muscle activation patterns (uniform scaling) across different force levels within a given movement class. This assumption leads to a simple training procedure, using training data collected at single contraction intensity for each movement class. The proposed method was compared to the widely accepted benchmark (LDA classifier) using offline and online evaluation. The offline classification errors obtained with the new method were either lower or higher than LDA depending upon the chosen feature set. In the online evaluation, the new classification method was operated using amplitude-EMG features and compared to the state-of-the-art LDA classifier combined with the time domain feature set. The online evaluation was performed in 11 able-bodied and an amputee subject using a set of four functional tasks mimicking daily-life activities. The tasks assessed the dexterity (e.g. switching between functions) and robustness of control (e.g. handling heavy objects). With the new classification scheme, the amputee performed better in all functional tasks whereas the able-bodied subjects performed significantly better in three out of four functional tasks. Overall, the novel method outperformed the state-of-the-art approach (LDA) while utilizing less training data and a smaller feature set. The proposed method is, therefore, a simple but effective and robust classification scheme, convenient for online implementation and clinical use.

Original languageEnglish
Article number8423713
JournalIEEE Transactions on Neural Systems and Rehabilitation Engineering
Volume26
Issue number9
Pages (from-to)1745-1755
Number of pages11
ISSN1534-4320
DOIs
Publication statusPublished - 1 Sept 2018

Keywords

  • cosine similarity
  • Electromyography
  • fast training
  • Force
  • functional tasks
  • hand prosthesis
  • muscle coordination
  • Muscles
  • Myoelectric control
  • Prosthetics
  • Prototypes
  • Task analysis
  • Training data

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