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Related Experiment Video

Updated: Dec 12, 2025

Training Persons with Spinal Cord Injury to Ambulate Using a Powered Exoskeleton
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Single-Actuator-Based Lower-Limb Soft Exoskeleton for Preswing Gait Assistance.

Ming-Hwa Hsieh1, Yin Hsuan Huang1, Chia-Lun Chao1

  • 1Department of Mechanical Engineering, National Taiwan University, Taipei 10617, Taiwan.

Applied Bionics and Biomechanics
|August 9, 2020
PubMed
Summary

This study introduces a novel single-motor soft exoskeleton to aid hip flexion in patients with muscle weakness. The lightweight design reduces metabolic cost during walking with minimal gait deviation.

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Area of Science:

  • Biomedical Engineering
  • Rehabilitation Robotics
  • Biomechanics

Background:

  • Muscle weakness impacts gait, necessitating assistive devices.
  • Conventional exoskeletons often use multiple motors, increasing weight and complexity.
  • Existing designs may face challenges like rotary motor slip during actuation.

Purpose of the Study:

  • To propose a novel lower-limb soft exoskeleton with a single motor for assistive forces.
  • To assist hip flexion during the preswing phase of the gait cycle.
  • To reduce metabolic cost and gait deviation in users with muscle weakness.

Main Methods:

  • A single-motor actuation system using a pulley and slider mechanism was designed.
  • The system converted rotational motion to linear motion for pulling knee braces via cables.
  • Actuation was triggered by detecting the end of thigh backward swing.
  • A prototype was fabricated and tested on 7 healthy subjects.

Main Results:

  • The soft exoskeleton provided an assistive force of 100 N.
  • Testing showed negligible gait deviation when wearing the exoskeleton.
  • A significant reduction in metabolic cost during walking was observed.
  • The single-motor design prevented slip issues associated with rotary motors.

Conclusions:

  • The developed single-motor soft exoskeleton is effective in providing assistive forces.
  • The lightweight design offers a promising solution for reducing metabolic cost in walking.
  • This technology has potential for integration into advanced exosuits for comprehensive gait assistance.