Robot you can EAT: Origami machine unfolds itself in the stomach to repair damage or remove swallowed objects
Engineers at the Massachusetts Institute of Technology have built a foldable robot (pictured) using dried PIG intestine that can crawl through the stomach.
http://www.dailymail.co.uk/sciencetech/article-3588596/The-robot-eat-Origami-machine-unfolds-stomach-repair-damage-remove-swallowed-objects.html