Breakthrough in collaborative magnetic microrobotics

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For the first time ever, researchers at the Surgical Robotics Laboratory of the University of Twente successfully made two microrobots work together to pick up, move and assemble passive objects in 3D environments. This achievement opens new horizons for promising biomedical applications.

Imagine you need surgery somewhere inside your body. However, the part that needs surgery is very difficult to reach for a surgeon. In the future, a couple of robots smaller than a grain of salt might go into your body and perform the surgery. These microrobots could work together to perform all kinds of complex tasks. "It’s almost like magic", says Franco Piñan Basualdo, corresponding author of the publication.

Researchers from the University of Twente successfully exploited two of these one-millimetre-sized magnetic microrobots to perform several operations. Like clockwork, the microrobots were able to pick up, move and assemble cubes. Unique to this achievement is the 3D environment in which the robots performed their tasks.

Controlling magnetic robots Achieving this was quite a challenge. Just like regular magnets stick together when they get too close, these tiny magnetic robots have a similar behaviour. This means they have a limit to how close they can get before they start sticking together. But the researchers at the Surgical Robotics Laboratory found a way to use this natural attraction to their advantage. With a custom-made controller, the team could move the individual robots, but also how they interacted with each other.

The microrobots are biocompatible and can be controlled in difficult-to-reach and even enclosed environments. This makes it a promising for biomedical studies and applications. "We can remotely manipulate biomedical samples without contaminating them. This could improve existing procedures and open the door to new ones", says Piñan Basualdo.

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