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Development of Variable Elastic Band with Adjustable Elasticities for Semi-Passive Exosuits.

Jaewook Ryu1, Gyeongmo Kim1, Giuk Lee1

  • 1School of Mechanical Engineering, Chung-Ang University, Seoul 06974, Republic of Korea.

Biomimetics (Basel, Switzerland)
|November 26, 2025
PubMed
Summary

This study introduces a novel variable elastic band for semi-passive exosuits, overcoming limitations of current designs. This innovation allows for customizable stiffness, enhancing assistive force profiles for diverse movements.

Keywords:
Mooney–Rivlin modelelasticityforce–elongation curvehip-flexion assistancesemi-passive exosuitvariable elastic band

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Area of Science:

  • Biomechanics
  • Rehabilitation Engineering
  • Materials Science

Background:

  • Active exosuits face challenges with battery life, weight, and maintenance.
  • Passive exosuits offer advantages in cost and usability but have fixed stiffness, limiting assistive force profiles.
  • Existing exosuit technologies present a trade-off between functionality and practicality.

Purpose of the Study:

  • To develop a variable elastic band for semi-passive exosuits.
  • To enable customizable stiffness and adaptable assistive force profiles.
  • To overcome the limitations of fixed elasticity in passive exosuit designs.

Main Methods:

  • A novel variable elastic band composed of rubber bands and webbings connected in parallel and series.
  • Restricting rubber band elongation based on webbing length to control elasticity.
  • Experimental validation of stiffness generation and predictive modeling using coefficient of determination (R²).

Main Results:

  • The variable elastic band successfully generated a range of stiffness levels.
  • Stiffness levels were accurately predicted with an average R² of 0.9985.
  • Participant testing demonstrated effective modulation of assistive force profiles.

Conclusions:

  • The proposed variable elastic band enhances semi-passive exosuits by offering adjustable stiffness.
  • This innovation addresses limitations of passive exosuits, enabling greater customization.
  • The findings pave the way for improved efficiency and adaptability in passive exosuit systems.