Here’s how it works. There are three versions of the device: the PillCam ESO, for the esophagus, the PillCam SB for the stomach, and the PillCam Colon for the lower GI tract. All versions of the PillCam contain a little chemical battery that’ll give it eight to ten hours of recording time, plus a light source and two tiny CCD cameras. A patient who’s about to use it will strap on a belt containing a receiver and an SD card or equivalent storage medium. Then they swallow the tiny pill. The camera proceeds through the GI tract, takes between 2,600 and 57,000 pictures while it’s on its way through, and “produces no pain or even sensation as it moves through the colon” over a period of a few hours.
DUMMR.com 