Remote detection of gastroesophageal reflux using an impedance and pH sensing transponder

Hung Cao, Vaibhav Landge, Shreyas Thakar, Smitha Rao, Lun Chen Hsu, Shou Jiang Tang, Stuart Spechler, H. Fred Tibbals, J. C. Chiao

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


In this work, we developed a dual-sensor system to monitor the symptoms in gastroesophageal reflux disease (GERD). The system consists of an implantable transponder and an external reader. The passive telemetry for signal transduction is based on an inductive link between two coil antennas. The reader supplies radio frequency power, obtains and stores the backscattered sensory data. The dual-sensor transponder detects both impedance and pH changes associated with the gastroesophageal reflux episodes and sends load-modulated signals back. Bench-top experiments were conducted to examine the robustness of the wireless transponding system. Preliminary in vivo experiments were conducted with a live pig. Our dual-sensor transponder system has successfully demonstrated its capability for effective GERD symptom monitoring.

Original languageEnglish (US)
Title of host publicationIMS 2012 - 2012 IEEE MTT-S International Microwave Symposium
StatePublished - Oct 3 2012
Event2012 IEEE MTT-S International Microwave Symposium, IMS 2012 - Montreal, QC, Canada
Duration: Jun 17 2012Jun 22 2012

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X


Other2012 IEEE MTT-S International Microwave Symposium, IMS 2012
CityMontreal, QC


  • Dual-sensor
  • GERD
  • Impedance sensor
  • Passive telemetry
  • Wireless sensor system
  • pH sensor

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Remote detection of gastroesophageal reflux using an impedance and pH sensing transponder'. Together they form a unique fingerprint.

Cite this