The FDA has been very cautious about the PillCam, the small camera that can travel through your intestines. It has been in works for more than 9 years and it just got approved in 2014.
More on this story from the Boston Globe.
This animated video shows how PillCam® COLON 2 travels naturally through the GI tract while capturing images of the colon. PillCam COLON is the only non-invasive colon exam that can directly visualize polyps after an incomplete colonoscopy.
PillCam COLON allows a safe and accurate examination without requiring sedation. The procedure offers convenience for both the clinician and patient since the patient’s daily activities can be resumed shortly after swallowing the video capsule.