I'm more intrigued by the possibility of healing stomach wounds than by retrieving small items from the stomach with this robot. Stomach contents are emptied into the intestines within a few hours [1]. Based on my most recent visit to the emergency room, you would have to be pretty damn lucky to actually see a doctor fast enough for this to be useful.
[1] http://arbl.cvmbs.colostate.edu/hbooks/pathphys/digestion/ba...