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A Trade-Off between Complexity and Interaction Quality for Upper Limb Exoskeleton Interfaces.

Dorian Verdel1,2,3, Guillaume Sahm1,2, Olivier Bruneau3

  • 1Université Paris-Saclay, CIAMS, 91405 Orsay, France.

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|April 28, 2023
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Summary
This summary is machine-generated.

This study introduces a novel exoskeleton forearm interface design with passive rotations. This innovation enhances human-exoskeleton interaction for rehabilitation and workplace safety, reducing complexity and improving movement assistance.

Keywords:
human-exoskeleton interactionspassive degrees of freedomself-aligning mechanisms

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Area of Science:

  • Robotics
  • Biomechanics
  • Human-Computer Interaction

Background:

  • Exoskeletons offer potential for rehabilitation and preventing workplace musculoskeletal disorders.
  • Current exoskeleton designs face limitations due to conflicting constraints between interaction quality and device complexity.
  • Increasing passive degrees of freedom improves interaction but adds inertia and control challenges.

Purpose of the Study:

  • To investigate the impact of two passive rotations in the forearm interface on reaching movements.
  • To evaluate a design compromise that balances interaction quality with exoskeleton complexity.
  • To assess the benefits of this design for human-exoskeleton interaction.

Main Methods:

  • Investigated sagittal plane reaching movements in participants using a modified exoskeleton forearm interface.
  • Kept the upper arm interface consistent, without passive degrees of freedom.
  • Analyzed interaction efforts, kinematics, electromyographic (EMG) signals, and subjective participant feedback.

Main Results:

  • The inclusion of two passive forearm rotations significantly improved interaction quality.
  • The design demonstrated benefits across interaction efforts, kinematics, and EMG activity.
  • Participants provided positive subjective feedback regarding the interface's performance.

Conclusions:

  • The proposed exoskeleton forearm interface design offers a viable compromise between conflicting design constraints.
  • This design is suitable for rehabilitation sessions and specific occupational tasks.
  • The findings support further research into optimized human-exoskeleton interfaces for movement assistance.