BioflexBot: A Spring-and-Air Robot Hand That Out-Rotates Human Fingers

Key points

• The BioflexBot gripper, published in Advanced Science in 2025, uses a coiled spring and compressed air rather than finger-shaped mechanics.
• It can rotate nearly four times further than a human hand and grasp objects up to almost 13 times larger than comparable robotic grippers.
• The team demonstrated it inspecting aeroplane engine blades, assisting a humanoid robot with household tasks, and running a chemistry experiment.
• Two senior authors from Chinese universities say the design cuts hardware cost and control complexity compared with human-shaped robotic hands.

Most robotic hands fail for the same reason: they copy human anatomy. Bones, tendons, joints, all recreated in metal and silicone, producing mechanisms that are expensive to build and genuinely difficult to control.

Researchers at the Chinese University of Hong Kong Shenzhen and the Nanjing University of Information Science and Technology tried a different starting point. Forget the shape. Focus on what a hand actually does.

The functions they isolated: pinch small objects, rotate things, hook onto handles, grasp items of very different sizes. Their prototype, the BioflexBot, delivers all four using a coiled spring, a constraining shell (a casing that channels how the spring bends) and a pneumatic system, meaning one that uses compressed air to move mechanical parts, with just two air inputs.

What can it actually do?

More than a human hand in some directions, at a fraction of the usual cost. The researchers published their validation tests in the peer-reviewed journal Advanced Science, published by Wiley.

For delicate work, the gripper picked up an acupuncture needle and transferred liquid using a laboratory pipette without spilling. Those are fine-motor tasks that trip up most industrial robots.

Rotation was striking: the device turned a bottle cap nearly four times further than a human hand can manage. It also extends and contracts 3.5 times more than a human hand, which matters when you need to deliver something into a tight space or move several objects in sequence. Grasping range was the headline figure, the BioflexBot handled objects up to almost 13 times larger than comparable gripper systems.

Does this have real-world uses?

Yes, and the team showed three. A camera attached to the gripper inspected blades inside a 3D-printed model of an aeroplane engine, reaching curved surfaces a rigid tool couldn't follow. A second demonstration paired the BioflexBot with a humanoid robot body for everyday tasks. A third ran a basic chemistry experiment.

First reported by The Robot Report, the researchers are candid about their aim. "Unlike most robotic hands that replicate the human form, at high hardware and control costs, our approach focuses solely on mimicking the functions, not the shape," said senior author Yang Yang of Nanjing University of Information Science and Technology. Senior author Yingtian Li, currently at the Chinese University of Hong Kong Shenzhen, framed it around structural simplicity enabling cross-scale grasping.

The team's stated next step is moving from a laboratory prototype to a fully automated platform. No timeline was given.

What does this mean for patients and workers?

This is research, not a product on sale. But the direction's worth watching. A gripper that handles both a needle and a heavy toolbox on the same two-input system could eventually assist in operating theatres or care settings where tasks swing between delicate and forceful many times a day. Cheaper, simpler control also means smaller clinics could realistically afford the hardware. It's a meaningful gap to close, given that the humanoid robotics market could hit $370 billion by 2040, as we reported on 11 August 2026, yet the underlying hardware still hasn't kept pace with ambition.

Peer replication and larger trials should come before anyone reads too much into early demonstrations.