Key points from article :
Biocompatible material fits inside a capsule for swallowing.
Propels itself using stick-slip motion as well as liquid propulsion.
Steered by external magnetic fields.
Successfully removed button battery stuck to wall of synthetic stomach.
Every year, 3,500 swallowed button batteries are reported in the U.S. alone.
Daniela Rus: “For applications inside the body, we need a small, controllable, untethered robot system”
