I know that from the German medic science. And people started using it for stomach ulcer and such case.
But what is new for me is >>>The doctor can move it??!?!?!<<<. As far as I know the capsule flows down by itself and it makes continous live images which will be transmitted to the doc. Never heard that he's able to move that little crap. In case if he does move that thing, pray that the doc won't move the capsule somewhere else....