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Updated: Sep 15, 2025

Cardiac Muscle-cell Based Actuator and Self-stabilizing Biorobot - PART 1
Published on: July 11, 2017
Tetanus-driven biohybrid multijoint robots powered by muscle rings with enhanced contractile force
Tomohiro Morita1, Minghao Nie1, Shoji Takeuchi1
1Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, Tokyo 113-8656, Japan.
Researchers developed advanced muscle rings for biohybrid robots, enabling sustained, powerful contractions for complex movements like bending and undulation. This overcomes previous limitations of simple twitching, paving the way for more capable bio-robotic systems.
Area of Science:
- Bioengineering
- Robotics
- Biomedical Engineering
Background:
- Biohybrid actuators using muscle rings traditionally exhibit limited twitching movements.
- Existing muscle ring technology is unsuitable for applications requiring sustained contractile force.
Purpose of the Study:
- To develop muscle rings capable of generating high contractile forces under tetanus stimulation.
- To engineer biohybrid actuators for sophisticated robotic movements.
Main Methods:
- Enhanced rigidity of pillar-shaped supports.
- Increased myoblast density by reducing extracellular matrix.
- Integration of muscle rings with C-shaped anchors for motion conversion.
Main Results:
- Optimized muscle rings demonstrated significantly higher contractile forces than traditional methods.
- Achieved efficient conversion of contractile force into bending motion.
- Successfully applied muscle rings in gripper- and slither-type biohybrid robots.
Conclusions:
- The developed muscle rings enable sustained, powerful muscle contractions for advanced biohybrid robotics.
- This technology facilitates large deformations and undulatory movements in bio-robots.
- Represents a significant advancement in creating sophisticated biohybrid robotic systems.
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