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  • Capsules designed for clamping onto the esophageal wall tissue to obtain data of pH values in the esophagus. These capsules usually consist of a pH sensor (e.g., antimony electrode) and a telemetry (i.e., wireless) transmitter that send the pH data to a receiver worn by the patient. The data are recorded during a period of hours or a few days; the receiver includes dedicated software that permits recording and further viewing and analyzing the data at the end of the test. These capsules are used by ambulatory patients for esophageal pH measurement and recording; they facilitate correlating pH data to patient symptoms of gastro-esophageal reflux disease. These capsules are especially suited for patients who cannot tolerate nasal intubation; the capsules spontaneously detach and pass through the digestive system after the test is finished. Esophageal recording pH capsules may be supplied with accessories to facilitate calibration of the capsule (pH values).
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