According to MIT, Americans swallow over 3500 button-sized batteries every year. Say what? But instead of educating the public about not swallowing random crap, researchers at the school want people to swallow a new folding origami robot they have developed that's designed to retrieve foreign objects, among other tasks.
The tiny robot, which is a generous description, was actually co-developed by researchers at MIT, the University of Sheffield, and the Tokyo Institute of Technology. Its accordion-like design, perfected mostly through trial and error experimentation, uses something called "stick-slip" motion to get around. Tiny appendages stick to a surface giving it the friction and traction it needs to move forward, but release their grip when the tiny robot moves and changes its weight distribution.
But since this particularly origami robot is designed to function inside the human body, which is made mostly of water, it's also been augmented with tiny fins to help propel it along like flippers.
Instead of requiring surgery to be inserted into a patient, the origami robot is collapsed, frozen in ice and then swallowed like a capsule full of vitamins. Once inside the pill eventually melts (assuming the patient has a normal body temperature), the robot unfolds and it can then be manoeuvred around using an external magnetic field.
At the moment the robot's uses are limited to just retrieving other swallowed objects that have become stuck in the stomach or intestinal linings, but eventually its capabilities could be expanded to the point of performing actual surgical operations. When one origami robot has completed its task, another origami robot could be swallowed to retrieve it. And when that one has completed its task, another origami robot could be swallowed to retrieve it. And when that one has completed its task, another origami robot could be swallowed to retrieve it...