A wireless sensor for detecting gastroesophageal reflux

Thermpon Ativanichayaphong, Wen Ding Huang, Jianqun Wang, Smitha M N Rao, H. F. Tibbals, Shou Jiang Tang, Stuart Spechler, Harry Stephanou, J. C. Chiao

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


In this paper, we propose a new method to detect gastroesophageal reflux wirelessly. Based on passive telemetry using inductive links, 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 were conducted by passing different acidic or non-acidic solutions onto the implanted electrodes and measuring the signal amplitudes with an external receiver. Air, drinking water and different concentrations of artificial stomach fluids were used to test the impedance sensor. System configuration, device designs, fabrication processes and measurement results will be presented in this paper.

Original languageEnglish (US)
Title of host publicationBiomedical Applications of Micro- and Nanoengineering III
StatePublished - 2007
EventBiomedical Applications of Micro- and Nanoengineering III - Adelaide, Australia
Duration: Dec 11 2006Dec 13 2006

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherBiomedical Applications of Micro- and Nanoengineering III


  • GERD
  • Impedance monitoring
  • Telemetry
  • Wireless sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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