Development of an Implanted RFID Impedance Sensor for Detecting Gastroesophageal Reflux

A new method to detect gastroesophageal reflux is presented. Based on passive RFID principles, the impedance of the refluxate can be determined. We have designed and fabricated planar coils integrated with electrodes on flexible substrates using standard photolithography processes. The device can be implanted in the esophagus using currently available clinical techniques. In vitro experiments with simulated stomach acid were conducted. An approach to integrate the sensor with RFID systems is proposed. This device can help diagnose gastroesophageal reflux disease effectively.