Abstract
The detection of pH in the gullet and stomach is highly significant for the diagnosis of gastroesophageal reflux disease (GERD), particularly with the use of a pH sensor in vivo. Most conventional pH sensors are used singly and could not be inserted in the endoscope's working channel. Because the ion sensitivity field-effect transistor (ISFET) chip has become very small, we have made the pH sensor smaller than a conventional glass pH sensor, and have used it. In this paper, we introduce a small in vivo pH sensor catheter of 2.7 mm diameter and 8 mm length, which can be put in the endoscopy's working channel of 3 mm diameter. The catheter was evaluated in buffer solution (pH 2-12) and its sensitivity was 43 mV/pH. It was confirmed that the catheter properly functioned during an animal experiment.
Original language | English |
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Pages (from-to) | 417-424 |
Number of pages | 8 |
Journal | Sensors and Materials |
Volume | 20 |
Issue number | 8 |
Publication status | Published - 2008 |
Keywords
- Endoscope
- Gastroesophageal reflux disease (GERD)
- ISFET
- pH
ASJC Scopus subject areas
- Instrumentation
- Materials Science(all)