Tiny Robots, Big Job: How Nanobots Could Help Doctors

What if a robot could be so small that 1,000 of them could fit inside one drop of your blood? Scientists are building tiny helpers called nanobots that may one day travel through your body to find sick cells and help fix them, without any cutting or surgery at all!

- How small a nanobot really is - How a nanobot could travel through the body - One real way scientists are already testing tiny medical helpers - Why doctors are excited about this future tool

A nanobot is measured in nanometers. One nanometer is so tiny that if you lined up 100,000 of them side by side, they would only be as wide as one human hair! Nanobots being researched today are often between 50 and 500 nanometers wide, small enough to slip between your body's own cells.

Your blood vessels are like a giant river system carrying blood all through your body, from your toes to your brain. A nanobot small enough could ride along in that river, steered by doctors using magnets from outside the body, or guided by special coatings that stick only to sick cells, like a tiny key that only fits one lock.

Scientists at labs around the world, including teams at MIT, have tested tiny particles coated with molecules that stick specifically to cancer cells and ignore healthy ones. In animal tests, some of these particles delivered medicine directly to a tumor while leaving nearby healthy tissue alone. This is one early step toward real nanobots that could one day do this inside a human patient with a doctor's careful supervision.

Today, if doctors need to treat something deep inside the body, they sometimes need surgery, which can hurt and takes time to heal. If nanobots become safe and reliable, doctors could deliver medicine to exactly the right spot without any cutting at all. That could mean less pain and faster healing for kids and grown-ups alike.