Device (1), suitable for being ingested by a patient, comprising a disintegration matrix (12) that is designed to disintegrate in a digestive segment and a plurality of independent passive RFID markers (11) that are housed together in the disintegration matrix (12), the disintegration matrix (12) being shaped so that when it disintegrates, the RFID markers (11) separate from one another and are no longer mechanically connected, so that each RFID marker (11) is able to move independently of the other RFID markers (11) in several segments of the digestive system of the patient, the RFID markers (11) each being, in the disintegration matrix (12), protected by a hermetic encapsulation in a biocompatible material.
