In the future, surgery might be a lot less invasive thanks to some downright-amazing new medical technologies. New devices, called microgrippers, could be swallowed by a patient and then activated via chemicals and magnets to do surgical work inside the body with no incisions necessary.
Microgrippers could be programmed to react to chemicals it finds in the body. For example, a group of microgrippers could seek out and find a tumor based on its chemical makeup, surrounding it and removing it automatically. The microgrippers require no electricity to run, and they're powered by chemicals that are harmless to the human body. We'll see how big an impact these have on future medical procedures, but it's certainly an exciting development.