M2A,  The tiny camera in a capsule that is swallowed  (Single-use....)
The capsule is taken with  water, passes naturally through the digestive tract. The tiny camera inside records video images of the "journey" and transmits it to  a recorder belt worn throughout the day.   After 8 hours, the patient returns the belt to the physician/hospital. The doctors then view the images using Imaging workstation software, and reports the findings back to the patient.