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Implantable multichannel wireless electromyography for prosthesis control.

Daniel McDonnall1, Scott Hiatt, Christopher Smith

  • 1Ripple LLC, Salt Lake City, UT 84106, USA. danny@rppl.com

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|February 1, 2013
PubMed
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We created a wireless implantable device to record muscle signals for prosthetic limb control. This technology successfully amplified and transmitted electromyography (EMG) data in a canine study, showing clear gait phases.

Area of Science:

  • Biomedical Engineering
  • Neuroprosthetics
  • Implantable Devices

Background:

  • Advanced prosthetic limbs require intuitive control.
  • Simultaneous multi-axis control necessitates high-fidelity muscle signal acquisition.
  • Existing systems often face limitations in wireless transmission and signal quality.

Purpose of the Study:

  • To develop and validate a prototype implantable device for multichannel electromyography (EMG) recording and wireless transmission.
  • To assess the device's performance in benchtop and short-term in vivo settings.
  • To demonstrate the potential for multi-axis prosthetic limb control using recorded EMG signals.

Main Methods:

  • Developed a prototype implantable bioamplifier ASIC with discrete wireless components.

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  • Tested benchtop performance in dry and saline conditions, measuring noise, CMRR, and channel isolation.
  • Conducted a short-term in vivo study implanting devices in six dogs for at least one week.

    • Main Results:

    • The bioamplifier exhibited low input-referred noise (2.2 µV RMS), high common mode rejection ratio (>55 dB), and excellent channel isolation (avg. 66 dB).
    • Wireless transmission of EMG signals was successfully demonstrated.
    • In vivo recordings during canine ambulation clearly showed gait phases with low noise.

    Conclusions:

    • The developed prototype effectively amplifies and wirelessly transmits EMG signals.
    • This technology shows promise for enabling simultaneous multi-axis control of prosthetic limbs.
    • The device design is suitable for reliable, long-term muscle signal acquisition.