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Related Experiment Videos

BIONic WalkAide for correcting foot drop.

D J Weber1, R B Stein, K M Chan

  • 1Faculty of Physical Education and Recreation, University of Alberta, Edmonton, AB, Canada.

Conference Proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference
|February 3, 2007
PubMed
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This study demonstrates that implantable microstimulators (BIONs) offer a practical alternative for functional electrical stimulation (FES) to correct foot drop, providing selective muscle control and improved walking ability.

Area of Science:

  • Biomedical Engineering
  • Neurorehabilitation
  • Orthotics and Prosthetics

Background:

  • Foot drop significantly impairs walking ability and quality of life.
  • Current functional electrical stimulation (FES) methods using surface electrodes have limitations in selectivity and cosmesis.
  • Implantable microstimulators (BIONs) offer a potential for more targeted and discreet FES delivery.

Purpose of the Study:

  • To evaluate the feasibility and efficacy of using BIONs for correcting foot drop.
  • To compare BION stimulation with conventional surface FES for foot drop.
  • To assess the impact of BION stimulation on ankle kinematics, toe clearance, and walking efficiency.

Main Methods:

  • Development of a prototype BIONic foot drop stimulator by modifying a WalkAide2 device.

Related Experiment Videos

  • Comparison of BION stimulation of the deep peroneal nerve with surface stimulation of the common peroneal nerve.
  • Utilized 3-D motion analysis to quantify ankle and foot kinematics.
  • Measured the Physiological Cost Index (PCI) to assess walking effort and efficiency.

    • Main Results:

    • BION stimulation resulted in more balanced ankle flexion without foot eversion compared to surface stimulation.
    • BIONic WalkAide achieved a toe clearance of 3 cm, restoring normal gait parameters.
    • Physiological Cost Index (PCI) was significantly reduced with both surface and BION stimulation, indicating reduced walking effort.
    • Walking speed increased substantially with both stimulation types, with BION stimulation showing comparable efficacy to surface stimulation.

    Conclusions:

    • Functional electrical stimulation (FES) using BIONs is a feasible and effective method for correcting foot drop.
    • BIONs provide more selective muscle activation and control compared to surface stimulation.
    • This technology represents a practical and potentially more discreet alternative for individuals with foot drop.