Abstract:
The in vivo determination of an electrical potential difference across a human or animal membrane of a fluid-containing cavity, such as the stomach (200), is performed by arranging (e.g. via an endoscope (201)) a measuring half cell (20) (electrode and electrolyte) in its entirety within the cavity and in contact with the cavity fluid, and arranging a reference half cell (50) in contact with a human or animal fluid outside the cavity, typically the blood, suitably via a catheter (87). The concentration of a species such as a H concentration in gastric juice contributing significantly to a liquid junction potential between the measuring electrolyte and the cavity fluid is measured, preferably by means of a sensor such as a pH sensor (110), preferably arranged within the cavity, and a relevant correction of the potential difference measured is based on said concentration measurement.
Abstract:
L'invention se rapporte à une électrode en verre, comprenant une membrane en verre sensible aux ions. Cette membrane est composée d'un matériau composite qui consiste en une matrice de verre sensible aux ions et dans laquelle est dispersé un matériau de remplissage ayant une résistance à la rupture par traction supérieure à celle de la matrice. La membrane de l'électrode en verre est particulièrement résistante aux contraintes mécaniques et une telle électrode en verre trouve une application notamment comme électrode de mesure de Pco2 transcutanée du type Severinghaus.