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1. WO1981002831 - APPARATUS AND METHOD FOR MEASURING THE PARTIAL PRESSURE OF OXYGEN AND OF A GAS WHICH IN AQUEOUS SOLUTION GENERATES AN ACID OR A BASE

Publication Number WO/1981/002831
Publication Date 15.10.1981
International Application No. PCT/DK1981/000035
International Filing Date 13.04.1981
IPC
A61B 5/00 2006.01
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes; Identification of persons
G01N 27/49 2006.01
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electro-chemical, or magnetic means
26by investigating electrochemical variables; by using electrolysis or electrophoresis
416Systems
49Systems involving the determination of the current at a single specific value, or small range of values, of applied voltage for producing selective measurement of one or more particular ionic species
CPC
A61B 5/1491
AHUMAN NECESSITIES
61MEDICAL OR VETERINARY SCIENCE; HYGIENE
BDIAGNOSIS; SURGERY; IDENTIFICATION
5Measuring for diagnostic purposes
145Measuring characteristics of blood in vivo, e.g. gas concentration, pH value; ; Measuring characteristics of body fluids or tissues, e.g. interstitial fluid, cerebral tissue
1491Heated applicators
G01N 27/404
GPHYSICS
01MEASURING; TESTING
NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
27Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
26by investigating electrochemical variables; by using electrolysis or electrophoresis
403Cells and electrode assemblies
404Cells with anode, cathode and cell electrolyte on the same side of a permeable membrane which separates them from the sample fluid ; , e.g. Clark-type oxygen sensors
Applicants
Inventors
Priority Data
1579/8011.04.1980DK
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) APPARATUS AND METHOD FOR MEASURING THE PARTIAL PRESSURE OF OXYGEN AND OF A GAS WHICH IN AQUEOUS SOLUTION GENERATES AN ACID OR A BASE
(FR) DISPOSITIF ET PROCEDE DE MESURE DE LA PRESSION PARTIELLE DE L"OXYGENE ET D"UN GAZ QUI EN SOLUTION AQUEUSE PRODUIT UNE BASE OU UN ACIDE
Abstract
(EN)
A measuring electrode device (1) for measuring the partial pressure of oxygen and carbon dioxide (or of other gas which in aqueous solution generates an acid or a base) comprises a cathode (62) and an anode for polarographic measurement of oxygen and a pH-electrode (16) with associated reference electrode for pH-measurement, an electrolyte in contact with these electrodes and a membrane (12) which is permeable to oxygen and carbon dioxide. The anode and reference electrode functions are suitably performed by one electrode (80). To compensate for production of hydroxyl ions at the cathode, the device comprises a compensation electrode (66) which is in contact with the electrolyte and connected to compensation means, typically an operational amplifier, which force current through the compensation electrode to make the compensation electrode electrochemically consume hydroxyl ions in an amount stoichiometrically equivalent to hydroxyl ions generated at the cathode. Compensation electrode may consist of e. g. platinum or aluminum. When used for transcutaneous determination of the partial pressure of oxygen and carbon dioxide in blood, electrode device thermostated to a temperature slightly above skin temperature is applied to a skin area of a patient.
(FR)
Dispositif (1) d"electrode de mesure pour la mesure de la pression partielle de l"oxygene et du dioxyde de carbone (ou d"autre gaz produisant un acide ou une base en solution aqueuse) comprenant une cathode (62) et une anode pour la mesure polarographique de l"oxygene et une electrode de mesure du pH (16) avec une electrode de reference associee pour la determination du pH, un electrolyte en contact avec les electrodes et une membrane (12) permeable a l"oxygene et au dioxyde de carbone. Les fonctions de l"anode et de l"electrode de reference sont convenablement assurees par une electrode (80). Afin de compenser la production d"ions hydroxyle a la cathode, le dispositif comprend une electrode de compensation (66) en contact avec l"electrolyte et connecte a des moyens de compensation, typiquement un amplificateur operationnel, faisant passer un courant au travers de l"electrode de compensation pour que celle-ci consomme electrochimiquement des ions hydroxyle en une quantite stoechiometriquement equivalente aux ions hydroxyles generes a la cathode. Une electrode de compensation peut se composer par exemple de platine ou d"aluminium. En cas d"utilisation pour la determination transcutanee de la pression partielle de l"oxygene et du dioxyde de carbone contenu dans le sang, un dispositif d"electrode regle thermostatiquement a une temperature legerement plus elevee que la temperature de la peau est applique sur une surface de la peau d"un patient.
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