German scientists have created a spiked robot that can move through the intestines.

It is capable of carrying three times its own volume and up to 20 times its own weight. This means it can carry drugs, wireless electronic sensors, or even microneedles. He is also able to release microscopic drug particles through his microspikes. The robot's microspikes are coated with a thin layer of chitosan (a substance found in the shells of shrimp), which creates enough friction and stickiness on the "legs" to cling to the layer of mucus in the pigs' lungs, esophagus, stomach and intestines. The wireless device is 3.7 mm long and 1.5 mm wide.