Seed-Sized Surgical Robot Performs 5 Functions in Less Than a Second

Miniature Marvel: A 5-in-1 Surgical Robot the Size of a Seed

Imagine a surgical robot so small it can rest on your fingertip, yet capable of crawling across delicate tissues, cutting biological material, releasing drugs, gripping and storing tissue samples, and generating therapeutic heat—all without wires or batteries. Researchers at Nanyang Technological University (NTU) in Singapore have turned this vision into reality with a 4.4 mm (0.17 in) robot that can switch between these five functions in less than a second.

This breakthrough, published by the NTU team led by Associate Professor Lum Guo Zhan, addresses a long-standing challenge in magnetic medical robotics: combining multiple capabilities into a single miniature device. Most existing microrobots are specialists—one may transport drugs, another collect biopsies—but integrating diverse functions has proven difficult because magnetic fields typically affect the entire robot uniformly, making independent movement of different parts nearly impossible.

Seven Years of Development

The NTU team spent seven years solving this problem. The result is a robot that uses external magnetic fields to control its movements and functions, yet can perform distinct actions without onboard electronics. The robot’s design allows it to transition between tasks almost instantaneously, a feat that required innovative engineering of its material composition and structure.

“Most magnetic robots like this can perform only one or two functions. Our latest invention can now do five, and our long-term goal is for doctors to use these mini robots in the body, navigate them to a targeted location, and use them to perform treatments,” said Lum Guo Zhan, team leader and soft miniature robotics expert at NTU.

How It Works

The robot, measuring just 4.4 mm in length, is controlled wirelessly via magnetic fields. It can crawl across soft tissues, making it suitable for navigating through the body. When it reaches a target site, it can cut biological tissue, release therapeutic drugs, grip and store tissue samples for biopsy, or generate heat remotely—useful for cauterization or hyperthermia therapy.

This versatility could revolutionize minimally invasive surgery, potentially enabling procedures in hard-to-reach areas without large incisions. The robot’s ability to switch functions rapidly means a single device could perform multiple steps in a surgical workflow, reducing the need for multiple instruments and minimizing patient trauma.

Implications for Medicine

The field of magnetic medical robotics has long promised a future where tiny robots navigate the bloodstream or digestive tract to deliver treatments. However, most prototypes have been limited to one or two functions. The NTU robot’s five-in-one capability represents a significant leap forward, bringing the vision of a multifunctional surgical microrobot closer to clinical reality.

Potential applications include targeted drug delivery, where the robot releases medication precisely at a tumor site; biopsy collection, where it grasps tissue samples for analysis; and thermal therapy, where it heats tissue to destroy abnormal cells. The robot’s small size also means it could be deployed in delicate areas such as the brain or eyes.

Challenges Ahead

Despite the promise, several hurdles remain before such robots can be used in humans. The team must ensure the robot’s biocompatibility, precise control in complex bodily environments, and safe retrieval after procedures. Additionally, scaling up production and integrating imaging guidance systems will be necessary. Nonetheless, the NTU team’s seven-year effort has demonstrated that multifunctional magnetic microrobots are feasible, opening the door to further innovation.

As the field advances, we may see these seed-sized robots become standard tools in the surgeon’s arsenal, performing tasks that today require multiple instruments and larger incisions. For now, the NTU robot stands as a testament to what can be achieved when robotics, materials science, and medicine converge.

This article is based on reporting by New Atlas. Read the original article.