Forget pills – this microrobot delivers drugs directly inside the brain.
Scientists at ETH Zurich have created a minuscule, steerable microrobot that could revolutionize stroke treatment by delivering drugs directly inside the brain’s blood vessels.
Barely wider than a millimeter, the robot is a soft, biodegradable gel capsule filled with medication and laced with magnetic nanoparticles. Doctors can guide it remotely through arteries using powerful external magnets, navigating even the narrowest, fastest-flowing vessels in the brain.
When the capsule reaches the precise spot—such as a clot causing a stroke—a targeted high-frequency magnetic field gently warms it, melting the gel and releasing the drug exactly where it’s needed, with almost no spillover into the rest of the body.
The system has been successfully tested in realistic models of human blood vessels and in live pigs and sheep. To make the robot visible under medical imaging, the team added safe heavy-metal contrast agents.
Current stroke treatments often require flooding the entire body with potent clot-busting drugs, which can cause dangerous bleeding elsewhere. This precision approach could dramatically lower those risks while improving outcomes.
Navigating the bloodstream is extraordinarily difficult—the heart’s forceful pumping creates turbulent, high-pressure conditions—but the Swiss team solved this with an advanced hybrid magnetic control system that keeps the robot stably on course.
Still in the preclinical stage and not yet tested in humans, the technology nevertheless marks a major step toward minimally invasive, highly targeted therapies for strokes, brain tumors, aneurysms, and other conditions that are currently almost impossible to treat precisely from inside the body.