The Agile™ Patency System is designed to aid the gastroenterologist in verifying the patency of the GI tract. The system is essentially based on small identification tags, which are detected by radio frequency (RFID) encapsulated in a disintegrating capsule. The RFID tags have been marketed for many years for veterinary use. In animals they are injected sub-dermally and are used for life-long identification, marking and tracking47.