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Related Experiment Videos

Transcutaneous functional electrical stimulator "Compex Motion".

Thierry Keller1, Milos R Popovic, Ion P I Pappas

  • 1ParaCare-Institute for Rehabilitation and Research, University Hospital Balgrist, Zurich, Switzerland. kellert@balgrist.unizh.ch

Artificial Organs
|April 10, 2002
PubMed
Summary

Researchers developed Compex Motion, a versatile firmware and software upgrade for functional electrical stimulation (FES) devices. This upgrade transforms a standard stimulator into a flexible neuroprosthesis and research tool for custom applications.

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Area of Science:

  • Biomedical Engineering
  • Neuroprosthetics
  • Rehabilitation Technology

Background:

  • Commercially available functional electrical stimulation (FES) devices lack the flexibility required for diverse research and neuroprosthetic applications.
  • This limitation has historically necessitated the development of custom stimulators by research groups.
  • Existing FES systems often fail to meet the evolving needs of advanced FES research and development.

Purpose of the Study:

  • To present a novel firmware and graphical programming software upgrade, named Compex Motion, for the Compex 2 stimulator.
  • To enhance the versatility of the Compex 2 stimulator, enabling its use as a research tool and for developing custom neuroprostheses.
  • To provide a flexible platform for creating custom stimulation sequences controlled by external sensors and for physiological studies.

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Main Methods:

  • Development of new firmware and graphical programming software for the Compex 2 stimulator.
  • Implementation of arbitrary stimulation sequence generation with external sensor control capabilities.
  • Integration of multi-stimulator connectivity for increased channel count (multiples of four).
  • Utilized memory chip cards for programming and storage of stimulation strategies.
  • Incorporated four biphasic current-regulated stimulation channels and two analog input channels for sensor integration (e.g., goniometers, EMG).
  • Developed an EMG processing algorithm with software stimulation artifact blanking for real-time EMG control.

Main Results:

  • The Compex Motion upgrade transforms the Compex 2 into a versatile neuroprosthesis and research tool.
  • The system supports the development of custom neuroprostheses, neurological assessment devices, and muscle exercise systems.
  • Arbitrary stimulation sequences can be programmed and regulated by external sensors, including EMG.
  • Scalable channel configurations (8, 12, 16, 20+) are achievable by interconnecting multiple units.
  • Clinical trials are currently underway for the Compex Motion stimulator.

Conclusions:

  • The Compex Motion upgrade significantly enhances the flexibility and utility of existing FES devices.
  • This development empowers researchers to create sophisticated custom neuroprosthetic and research applications.
  • The system offers a scalable and adaptable platform for advanced functional electrical stimulation research and therapeutic interventions.