Simulation of intramuscular EMG signals detected using implantable myoelectric sensors (IMES)

Madeleine M. Lowery*, Richard F.Ff Weir, Todd A. Kuiken

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

The purpose of this study was to test the feasibility of recording independent electromyographic (EMG) signals from the forearm using implantable myoelectric sensors (IMES), for myoelectric prosthetic control. Action potentials were simulated using two different volume conductor models: a finite-element (FE) model that was used to explore the influence of the electrical properties of the surrounding inhomogeneous tissues and an analytical infinite volume conductor model that was used to estimate the approximate detection volume of the implanted sensors. Action potential amplitude increased progressively as conducting electrodes, the ceramic electrode casing and high resistivity encapsulation tissue were added to the model. For the muscle fiber locations examined, the mean increase in EMG root mean square amplitude when the full range of material properties was included in the model was 18.2% (±8.1%). Changing the orientation of the electrode with respect to the fiber direction altered the shape of the electrode detection volume and reduced the electrode selectivity. The estimated detection radius of the IMES electrode, assuming a cylindrical muscle cross section, was 4.8, 6.2, and 7.5 mm for electrode orientations of 0°, 22.5°, and 45° with respect to the muscle fiber direction.

Original languageEnglish (US)
Pages (from-to)1926-1933
Number of pages8
JournalIEEE Transactions on Biomedical Engineering
Volume53
Issue number10
DOIs
StatePublished - Oct 2006

Keywords

  • Detection volume
  • EMG
  • Encapsulation tissue
  • Implantable electrode
  • Myoelectric prostheses

ASJC Scopus subject areas

  • Biomedical Engineering

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