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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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Updated: May 31, 2025

Development of a Novel Task-oriented Rehabilitation Program using a Bimanual Exoskeleton Robotic Hand
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Development of a Cable-Driven Bionic Spherical Joint for a Robot Wrist.

Zixun He1, Yutaka Ito2, Shotaro Saito3

  • 1Faculty of Engineering, Tokyo Polytechnic University, 1583 Iiyama, Atsugi 243-0297, Kanagawa, Japan.

Biomimetics (Basel, Switzerland)
|January 24, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new tendon-driven bionic robot wrist that mimics human anatomy. This robotic wrist achieves a full range of motion for flexion-extension and ulnar-radial deviation, enhancing prosthetic capabilities.

Keywords:
bionic robotscable-driven mechanismrobotic wristsspherical joints

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Area of Science:

  • Robotics
  • Biomechanics
  • Biomedical Engineering

Background:

  • Wrist movements are essential for upper-limb motor tasks.
  • Replicating human wrist anatomy and function is key for advanced prosthetic and robotic hands.
  • Mimicking human biomechanics improves bionic hand performance.

Purpose of the Study:

  • To design and validate a tendon-driven bionic spherical robot wrist.
  • To replicate the antagonist muscle pairs and movement mechanisms of the human wrist.
  • To enhance the flexibility and human-like movement of robotic systems.

Main Methods:

  • Designed a tendon-driven bionic spherical robot wrist using two pairs of cables.
  • Utilized servo motors and pulleys to actuate cables, mimicking antagonist muscle pairs.
  • Validated the prototype through manipulation experiments to assess range of motion.

Main Results:

  • The proposed robot wrist successfully achieved a full range of motion for both ulnar-radial deviation.
  • Demonstrated capability for flexion-extension movements.
  • The mechanism effectively mimics human wrist biomechanics.

Conclusions:

  • The developed bionic wrist offers enhanced flexibility and human-like movement for robotic systems.
  • This design is suitable for integration into advanced prosthetic and robotic hands.
  • The study validates the effectiveness of tendon-driven mechanisms for replicating wrist functionality.