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A Wirelessly Powered 4-Channel Neurostimulator for Reconstructing Walking Trajectory.

Masaru Takeuchi1, Katsuhiro Tokutake2, Keita Watanabe1

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Summary

This study developed a wireless neurostimulator for precise control of rat ankle and knee joints using Functional Electrical Stimulation (FES). This robotic control technology enables reconstruction of functional leg movements like walking.

Keywords:
implantable deviceneurostimulationwireless powering

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Robotics

Background:

  • Controlling multiple joints for functional motion reconstruction is challenging.
  • Existing neurostimulation systems often lack wireless power and selective nerve activation.

Purpose of the Study:

  • To develop a wirelessly powered neurostimulator for selective Functional Electrical Stimulation (FES) of peripheral nerves.
  • To achieve independent control of rat ankle and knee joint angles.
  • To reconstruct functional leg movements, such as walking, using robotic control principles.

Main Methods:

  • A wirelessly powered four-channel neurostimulator with a receiver device was designed.
  • Selective nerve stimulation was achieved by detecting transmitter signal frequency.
  • Joint angles were controlled via independent stimulation currents adjusted by PID and feed-forward control with visual feedback.

Main Results:

  • The system successfully controlled rat ankle and knee joint angles.
  • Rat toe position was manipulated by adjusting joint angles.
  • The walking trajectory of a rat's hind leg was reconstructed using the developed system.

Conclusions:

  • Wireless FES offers precise control over multiple peripheral nerves.
  • Robotic control strategies can reconstruct complex functional motions like walking.
  • This technology advances neuroprosthetics and rehabilitation robotics.