BioflexBot robot hand matches human motions with simpler design

The BioflexBot research addresses a longstanding challenge in robotics: replicating human hand dexterity without replicating human hand complexity. Traditional robotic hands attempt to mirror the intricate anatomy of biological hands, which has historically resulted in systems that are expensive to manufacture and difficult to control. By contrast, the BioflexBot team—led by researchers from the Chinese University of Hong Kong, Shenzhen and Nanjing University of Information Science and Technology—pursued a functional approach: they identified the core motions a hand must perform (pinching, rotating, hooking, and grasping) and engineered a system that achieves those motions through minimal mechanical components: a coiled spring, a constraining shell, and pneumatic actuation with just two control inputs.

The validation experiments demonstrate that this minimalist design does not sacrifice performance. The BioflexBot reliably handled delicate laboratory and healthcare tasks (moving acupuncture needles, transporting liquids via pipette) while also exceeding human capabilities in extension, contraction, and load capacity. The device rotated a bottle cap nearly four times farther than a human hand could, and grasped objects up to 13 times larger than those comparable robotic systems could handle. These results suggest that biomimicry in robotics need not be anatomically faithful to be functionally superior. The researchers frame their findings as evidence that high dexterity can be achieved at low cost—a proposition that could reshape how roboticists approach gripper design for humanoid robots, industrial automation, and specialized inspection tasks in confined or hazardous environments.