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Biomimetic Prosthetic Hand Enabled by Liquid Crystal Elastomer Tendons.

Haiqing Lu1,2, Zhanan Zou2, Xingli Wu2,3

  • 1College of Mechanical Electrical and Vehicle Engineering, Weifang University, Weifang 261061, China.

Micromachines
|July 2, 2021
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Summary

Researchers developed a biomimetic prosthetic hand using artificial tendons made of liquid crystal elastomer and liquid metal. This innovative design offers a more efficient and human-like artificial hand for amputees and soft robotics applications.

Keywords:
electric currentliquid crystal elastomerstrainstress

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Area of Science:

  • Biomimetic engineering
  • Materials science
  • Robotics

Background:

  • Current prosthetic hands are often bulky, heavy, expensive, and inefficient.
  • There is a need for advanced prosthetic solutions that mimic human hand functionality.

Purpose of the Study:

  • To develop a biomimetic prosthetic hand using artificial tendons.
  • To investigate the use of liquid crystal elastomer (LCE) and liquid metal (LM) for artificial tendons.
  • To demonstrate the functionality of the prosthetic hand in performing complex tasks.

Main Methods:

  • Artificial tendons were created by combining liquid crystal elastomer (LCE) with a liquid metal (LM) heating element.
  • Joule heating was used to induce temperature increases in the LCE tendon, causing linear contraction.
  • The LCE tendon's response to joule heating (temperature, strain, stress) was characterized.
  • Strategies for constant contraction stress and accelerated cooling were explored.

Main Results:

  • The LCE tendon demonstrated controllable linear contraction upon joule heating.
  • The biomimetic prosthetic hand successfully performed various hand gestures.
  • The hand effectively held objects of different sizes and shapes and carried weights.
  • The study explored methods to optimize tendon performance for practical applications.

Conclusions:

  • The developed artificial tendon, combining LCE and LM, effectively drives a biomimetic prosthetic hand.
  • This technology offers a promising, more efficient alternative to current prosthetic hands.
  • The findings have potential applications in prosthetics, robotics, and soft machines.