Electrode for measuring co2 tension in blood and other liquid and gaseous environments

Abstract

Abstract A SENSOR OF THE PARTIAL PRESSURE OF CARBON DIOXIDE IN BLOOD, OTHER FLUID, OR GASEOUS MIXTURE COMPRISES A REFERENCE HALF-CELL AND A SENSING HALF-CELL IMMERSED IN A COMMON ELECTROLYTE COMPRISING CHLORIDE AND BICARBONATE IONS. THE SENSING HALF-CELL MAY BE PALLADIUM-PALLADIUM OXIDE (PD-PDO) OR IRIDIUM-IRIDIUM OXIDE (IR-IRO) AND THE REFERENCE HALF-CELL MAY BE SILVER-SILVER HALIDE. THE SENSING HALF-CELL IS A WIRE COATED AT ITS DISTAL END WITH ITS OWN OXIDE. THE REFERENCE HALF-CELL MAY BE A SILVER TUBE WHICH IS COATED ON ITS TIP WITH SILVER HALIDE AND SLIPPED OVER AN INSULATED SECTION OF THE WIRE. THE DISTAL ENDS OF THE TUBE AND WIRE ARE DIPPED INTO ELECTROLYTE WHICH ADHERS AND THEN INTO A POLYMER WHICH FORMS A CARBON DIOXIDE PERMEABLE AND ION-IMPERMEABLE MEMBRANE OR BARRIER ON THE WHOLE ASSEMBLY WHEN THE POLYMER CURES. THE PROXIMAL ENDS OF THE SILVER TUBE AND WIRE ARE CONNECTED BY MEANS OF A COAXIAL CABLE TO A HIGH IMPEDANCE VOLTMETER WHICH IS CALIBRATED IN TERMS OF PARTIAL PRESSURE OF CARBON DIOXIDE IN MILLIMETERS OF MERCURY. MEANS ARE PROVIDED FOR STANDARDIZING THE SENSOR AND KEEP IT EQUILIBRATED DURING STORAGE.

Inventors

• 👤 R Macur

Bibliographic Details