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Solvent polymeric membrane pH catheter electrode for intraluminal measurements in the upper gastrointestinal tract


A hydrogen ion-selective PVC membrane based on octadecyl isonicotinate (ETH 1778) is used to construct a miniaturised potentiometric pH electrode for intraluminal application. The all-polymeric device includes a reference electrode and is of less than 2 mm overall diameter. The current state of the materials used limits its dynamic range to between pH 0 and 4. The lifetime is at least five months. The inexpensive and easy construction allows its use as a disposable device.

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Oesch, U., Brzózka, Z., Xu, A. et al. Solvent polymeric membrane pH catheter electrode for intraluminal measurements in the upper gastrointestinal tract. Med. Biol. Eng. Comput. 25, 414–419 (1987).

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  • Intraluminal probe
  • pH electrode
  • Polymeric membrane