A stylised image of the lungs. The tubes are multicoloured and the lobes range from purple to blue.
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Microrobots Fighting Lung Disease. 

ByHayley Frend
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Lung disease is rapidly becoming one of the most devastating health crises worldwide, claiming millions of lives each year, with the situation set to worsen as pollution levels rise.

The COVID-19 pandemic served as a stark reminder of just how devastating respiratory illnesses can be. Millions experienced lung damage, long COVID symptoms, and pneumonia,

But we are fighting back. 

Imagine a world in which tiny robotic couriers could steer through our lungs, delivering life-saving treatments to the very heart of disease. This isn’t science fiction. Scientists are developing swarms of microscopic robots designed to navigate the warren-like passages of our lungs, delivering medication with pinpoint accuracy. 

The internal structure of the lungs. The warren-like passages of the lungs can be seen, with tortuous branching and successively narrowing passages. The image highlights the complexity of the lungs.

A maze of difficult-to-navigate passages

One day, these miniature postal workers could revolutionize treatment, delivering a knockout blow to some of the deadliest lung diseases.

FYI- fascinated by how futuristic robots are transforming medicine? Don’t miss this blog on how surgeons are using robotic tools to perform operations from miles, or even continents, away!

Lung disease 

Lung cancer and pneumonia are major global killers.

According to the World Health Organisation and the IHME together they account for over 5 million deaths every year.

Additionally, diseases like cystic fibrosis, though relatively rare, drastically shorten life expectancy and decrease quality of life.

a man in a whote shirt holds his fist to his mouth as he is coughing. His other hand extends towards the camera, palm towards the camers in a 'stop' symbol. His forehead is creased, showing his apparent stuggle and suffering.

Photo by Towfiqu barbhuiya in Unsplash

Hard to treat 

Current treatments often fall short, leaving patients with limited options.

This is because doctors face a real challenge in delivering medication to the disease sites within the lungs.  

  • Giving medication by tablet or injection leads to many healthy organs and tissues experiencing the effects of the drugs, resulting in unacceptable toxicity. 
  • Delivering medication directly into the lungs by inhalation affects healthy lung tissue too, leading to unwanted side effects.,
  • The structure of the lung is like a series of tortuous passages, each one getting successively narrower and more difficult to navigate. Bronchoscopes can only wind partly into the lungs and often lack the dexterity to reach exact problem sites to deliver medication accurately.

Swarms of microscopic robots

Scientists in China have come up with a particularly ingenious solution: 

Swarms of magnetic microrobots that can crawl along the branches of the lungs to deliver medication with high precision. 

The microrobots are a marvel of science. They are not much bigger than a grain of sand and are made out of magnetic microparticles. Experts can control them by applying an external magnetic field. The microrobots act as a swarm, meaning they can move as one, split, reconvene, or change shape, just like a swarm of insects. 

A swarm of insects cross the sky. They form a zig-zag pattern, evoking the feeling that they move as one. Underneath we see the silhouettes of palm trees.

Photo by Panha Kang on Unsplash

Precision delivery of life-saving drugs 

They also fused these magnetic microparticles with a hydrogel. 

Hydrogels are:

  • Completely non-toxic due to their very high water content. 
  • Soft and flexible, decreasing the chance the microrobots could cause any damage inside the body. 
  • Responsive -they can swell and begin to break down due to a change in temperature, pH, light or electrical stimulation. 

Since disease sites in the lung often have an altered pH, degrade and release the medication exactly where needed. 

The scientists are also hopeful that the robots could be engineered to break down in response to other triggers, giving doctors further control over when and where the medicine is delivered. 

Microrobotics in other organs

It’s not the first time these swarms of microrobots have been used by doctors to reach the impossible spaces deep within us. 

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In 2023, researchers in America guided microrobots to kill cancer cells in mice with high accuracy. 

In lab experiments, microrobots successfully cleared artificial blood clots in tiny, human-like vessels.

Microrobots have also been tested in pig eyes, showing they can precisely deliver medicine to treat blindness-causing diseases.

Watch this video to see how scientists have developed robots capable of moving through fluid environments

Incredible as it may sound, these robot swarms have been shown to lift objects many times heavier than themselves, demonstrating a power and precision that could one day conquer diseases once deemed beyond reach. Check them out: 

But the lungs present an entirely new challenge. It is easier for microrobots to swim through the liquid contained within an eye than it is for them to crawl through the slimy, twisted maze that is our lungs. 

Putting the robots to the test

These were the very challenges Dr Chen colleagues aimed to overcome. Developing the microrobots was only the first step. Next it was time to put it to the test. 

  1. First, they built a 3.D replica of a bronchial tree (the network of small passages in our lungs).
  2.  Next, they tested whether the microrobots could navigate to the end of a bronchial passage and around a hole without getting trapped or misdirected. 
  3. They designed the microrobots to carry tiny fluorescent packages, enabling them to follow their progress with medical scans. 
A panel of four images taken from the academic paper. We can see a bronchus branch. The first image is a diagram showing the swarm moving up to travel down the upper branch. The final three images are microscopic pictures showing the microrobots climbing up the bronchus wall in order to travel along the upper branch.

Figure from Koehl, A., et al. (2023). Structure-based discovery of nonopioid analgesics acting through the α2A-adrenergic receptor. Science Advances, 9(39), eadr3356. https://doi.org/10.1126/sciadv.adr3356

Here, you can see the robots climb a passage wall and selectively navigate the upper branch. 

Test one passed!

The next challenge was even more daunting, could these robots navigate through the sticky, viscous mucus that lines our lungs, a critical test to determine if they could overcome the body’s natural defences? 

For this, they used a pig lung and sent the robots deep into the lung branches. The robots were able to change shape, to avoid going down the wrong branches and climb along the wall passage to their target site. All this was done with no damage to the lungs. 

Second test passed!

A panel of smaller images taken from the academic paper. IN the top row is four medical magnified images of a lung bronchus. The microgel swarm can be seen as small dots clustered in one of the tubes. A large black magnet is seem above the dots. As the images progres the magent and the swarm move upwards along the bronchus. In the bottom row is another four images. howing the swarm changing shaoe, getting smaller and getting larger. All images show how the swarm can move and change formation.

Figure from Koehl, A., et al. (2023). Structure-based discovery of nonopioid analgesics acting through the α2A-adrenergic receptor. Science Advances, 9(39), eadr3356. https://doi.org/10.1126/sciadv.adr3356

Here you can see the magnetic particles move and change shape in response to the magnet.

Top Tip-while microrobots are making waves, AI is quietly transforming how doctors diagnose and treat patients. Check out how artificial intelligence is changing medicine from the ground up.

What’s Next?

While magnetic microrobots hold immense potential for delivering life-saving drugs straight to diseased lungs, there’s still a long road ahead before they become a reality in hospitals.

The next steps include:

  • Refining the technology
  • Deciding which diseases and medications to prioritize 
  • Perfecting how these tiny couriers release their therapeutic cargo. 

Scientists will likely develop specialized hydrogels to ensure precise drug delivery while also exploring ways to retrieve or safely break down the microrobots once their mission is complete. 

Another exciting possibility is engineering them to anchor at disease sites and gradually release medication over time, an approach that could revolutionize treatment for conditions like lung cancer. 

As research continues, these microscopic marvels edge closer to transforming medicine—offering a future where targeted, efficient, and minimally invasive treatments become the norm.

Tonights Dinner Table Discussion

Here’s some ideas to spark a fascinating discussion.

  • Would you or someone you love volunteer for a trial using microrobots? What factors would influence that decision?
  • How do we build public trust in emerging treatments like microrobots? What lessons can we learn from past medical innovations or controversies?
  • How can we ensure cutting-edge treatments like this are accessible globally, not just to wealthy nations or individuals?
  • Would you rather invent new medical technology or be the first to try it? Who do you think is most inspirational, the scientist or the first patient?

Big Family Question:

If you were sick, would you feel comfortable using these tiny robots to get better? Why or why not?

Looking for more family-friendly discussion prompts? Explore our child-focused version of this blog here.

Curious but cautious?

Love diving into science, but not always sure what to believe? Grab our free guide:
“5 Ways to Spot Fake Science News”
It’s full of quick, practical tips to help you tell real breakthroughs from misleading headlines.

Tiny robots delivering drugs deep into the lungs could transform how we treat disease. Want more cutting-edge science like this? Subscribe to the newsletter now and stay ahead of what’s next in medicine.

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Let’s Talk About It

Would you be comfortable receiving treatment from microrobots inside your body, or would you prefer more traditional methods? Why? We would love to hear your thoughts below:

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