These muscle-powered robots may soon have applications in drug delivery, tissue repair, and improved disease modeling. However, most are currently proof-of-concept laboratory prototypes. In a study led by Dr. Su Ryon Shin at Harvard Medical School, published in the International Journal of Extreme Manufacturing, scientists review advanced fabrication techniques-such as 3D bioprinting, electrospinning, microfluidics, and self-assembly-that are pushing the boundaries of muscle-driven robotics.
"Fabrication isn't just about building the parts. It's the key to performance," Dr. Shin explained. "The way we grow and guide muscle cells determines whether these robots can move, adapt, and last."
Biohybrid robotics research currently focuses on two tissue types. Skeletal muscle, which contracts forcefully upon stimulation, produces strong, targeted movement; cardiac muscle, which beats on its own rhythmically, supports consistent and coordinated actuation. Tailored fabrication methods allow researchers to align and support these cells within engineered constructs. When properly integrated, muscle cells contract together, turning living tissue sheets into coordinated robotics systems.
The major challenge is fragility. Most current robots are small and delicate, functioning only under precise laboratory conditions. To address these limitations, scientists are exploring multi-material printing for enhanced robustness, perfusable scaffolds that sustain muscle tissue with nutrient supplies, and modular construction for increased durability and adaptability.
If these advances succeed, muscle-powered robots may become reliable tools in medicine or industrial applications. Beyond robotics, these technologies could help develop adaptable, healing machines that interact with biological systems in ways existing mechanical devices cannot.
Dr. Shin and colleagues anticipate this transition is near. "The next generation of biohybrid robots will not only achieve precise actuation and adaptability," she said. "They'll overcome barriers of scale and integration. They'll actively support human health."
As fabrication capabilities improve, tomorrow's robots may contract and grow like living tissue, rather than simply relying on mechanical motion.
Research Report:Advanced biofabrication techniques of muscle cell-powered biohybrid robots
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International Journal of Extreme Manufacturing
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