Abstract: A sensor capable of sensing the flow of fluids is placed in the gastrointestinal tract. The sensor may be, for example, an ultrasonic flow sensor, an optical flow sensor, or a thermal convection flow sensor. A system for monitoring fluid flow in the gastrointestinal tract may include monitor configured for placement in the gastrointestinal tract that includes such a sensor. The monitor measures the flow of fluid in the gastrointestinal tract based on the output of the senor. The monitor may take the form of a capsule with a means or mechanism for attachment to a mucosal lining of the gastrointestinal tract. In exemplary embodiments, the sensor is placed in the esophagus, senses the flow of fluid from the stomach into the esophagus, and is used to diagnose gastroesophageal reflux disease (GERD).

Abstract: A sensor capable of sensing the flow of fluids is placed in the gastrointestinal tract. The sensor may be, for example, an ultrasonic flow sensor, an optical flow sensor, or a thermal convection flow sensor. A system for monitoring fluid flow in the gastrointestinal tract may include monitor configured for placement in the gastrointestinal tract that includes such a sensor. The monitor measures the flow of fluid in the gastrointestinal tract based on the output of the senor. The monitor may take the form of a capsule with a means or mechanism for attachment to a mucosal lining of the gastrointestinal tract. In exemplary embodiments, the sensor is placed in the esophagus, senses the flow of fluid from the stomach into the esophagus, and is used to diagnose gastroesophageal reflux disease (GERD).