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A compact system for simultaneous stimulation and recording for closed-loop myoelectric control.

Martin A Garenfeld1, Nikola Jorgovanovic2, Vojin Ilic2

  • 1Department of Health Science and Technology, Aalborg University, Frederik Bajers Vej 7D, 9220, Aalborg Ø, Denmark. magar@hst.aau.dk.

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Summary

This study introduces a novel system for myoelectric prostheses that enables simultaneous signal recording and electrotactile stimulation, preserving control quality. The technology allows for meaningful somatosensory feedback, enhancing prosthetic limb functionality.

Keywords:
Closed-loop controlDynamic blankingElectrotactile stimulationMyoelectric prosthesisSensory feedback

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Rehabilitation Technology

Background:

  • Myoelectric prostheses currently lack somatosensory feedback, limiting user-limb communication to a unidirectional flow.
  • Electrotactile stimulation offers a promising avenue for bidirectional communication but faces challenges with signal interference.
  • Interference between electrotactile stimulation and myoelectric signal recording can negatively impact prosthetic control.

Purpose of the Study:

  • To develop and evaluate a compact system for simultaneous myoelectric signal recording and electrotactile stimulation.
  • To assess the impact of electrotactile feedback on closed-loop myoelectric control performance.
  • To investigate the effectiveness of a novel feedback coding scheme for conveying prosthetic limb status.

Main Methods:

  • A novel system employing dynamic blanking of stimulation artifacts for simultaneous recording and stimulation was developed.
  • A feedback coding scheme for wrist rotation and hand aperture was designed to test myoelectric control under feedback.
  • Ten subjects performed a 2-DOF cursor control task with visual, combined visual-electrotactile, and electrotactile-only feedback.

Main Results:

  • No significant performance difference was observed between visual feedback and combined visual-electrotactile feedback conditions.
  • Electrotactile stimulation preserved the quality of myoelectric control, with similar target achievement and movement efficiency.
  • While electrotactile-only feedback showed reduced completion rates and slower target acquisition, it still provided meaningful information, indicated by comparable path efficiency.

Conclusions:

  • The developed system enables robust closed-loop myoelectric control through electrotactile stimulation without compromising control quality.
  • The system's ability to integrate recording and stimulation electrodes facilitates future embedding into prosthetic sockets.
  • This advancement represents a significant step towards creating integrated prosthetic systems with effective somatosensory feedback.