Researchers at Purdue University have engineered micro-robots that traverse the colon to deliver medications precisely. Initial tests on animal models have proven successful.
Picture a tiny robot navigating your intestines to release drugs exactly where needed. That's the innovative goal of Purdue University researchers in the US. In recent months, they've prototyped these micro-machines and tested them in mouse models.
In a groundbreaking study, micro-robots measuring 0.8 mm long by 0.4 mm wide were introduced via the rectum into the colons of anesthetized rodents. The path proved challenging.
"Moving a robot through a colon is like using an airport buggy to reach a terminal faster," explains biomedical engineer Luis Solorio, lead author of the study. "Not only is the ground vibrating, but there are crowds everywhere. In the colon, fluids and materials flow one way while the robot pushes against them. It's a tough journey."
These devices don't require batteries. Instead, they're propelled by an external rotating magnetic field. "When we apply a rotating magnetic field, the robots spin like car tires on rough terrain," says David Cappelleri, associate professor of mechanical engineering and co-lead author. "The field penetrates tissues safely, making it ideal for in-body applications."
Despite obstacles, all tested micro-robots advanced successfully and delivered their drug payloads to precise locations.
This marks the first successful in vivo demonstration of such technology. Human trials are years away, but the results suggest potential for treating intestinal diseases via colon-targeted delivery.
With minimal tissue damage, these robots could explore other body passages for broader disease treatments. They're crafted from affordable, biocompatible materials and can be manufactured efficiently.
