Miniature probe containing multifunctional electrochemical sensing electrodes

Claim 1

A MINIATURE PROBE CONTAINING AN OXYGEN SENSOR, A CARBON DIOXIDE SENSOR AND A PH ELECTRODE WHICH COMPRISES A FLEXIBLE, ELONGATED ELECTRODE LEAD, THE ELECTRODE WHICH COMPRISES A BASE MEMBER, AND AN EXTERIOR SURFACE OF PALLADIUM ON THE BASE MEMBER, THREE SEPARATE AND SPACED APART ELECTROCHEMICALLY ACTIVE REGIONS OF HYDRIDED PALLADIUM WITH A SURFACE OF PLATINUM BLACK, PALLADIUM OXIDE AND PALLADIUM OXIDE, RESPECTIVELY, ADHERING TIGHTLY TO AN IN ELECTRICAL LEAD AND INSULTED SURFACED BASE MEMBER OF THE ELCTRODE LEAD AND INSULATED ELECTRICALLY FROM EACH OTHER THEREBY FORMING AN OXYGEN ELECTRPDE, A HYDROGEN ELECTRODE AND A HYDROGEN ELECTRODE, SURTIVELY, A REFERENCE ELECTRODE FOR THE OXYGEN ELECTRODE SURRESPECROUNDING AT LEAST PARTIALLY AND SPACED FROM THE METAL SURFACED BASE MEMBER OF THE ELECTRODE LEAD, THE REFERENCE ELECTRODE CONTAINING A METAL LEAD AND AN ELECTROCHEMICALLY ACTIVE REGION OF SILVER, A LAYER OF ELECTRICAL INSULATION DISPOSED BETWEEN THE METAL SURFACED BASE MEMBER FOR THE ELECTRODE LEAD AND THE METAL LEAD OF THE REFERENCE ELECTROD, AND ELECTROLYTE CONTACTING BOTH THE ELECTROCHEMICALLY ACTIVE REGIONS OF HYDRIDED PALLADIUM WITH A SURFACE OF PLATINUM BLACK, AND SILVER, AND AN OUTER SHEATH OF OXYGEN PERMEABLE, ION-IMPERMEABLE DIFFUSION BARRIER MATERIAL ENCAPSULTING AT LEAST THE ELECTROCHEMICALLY ACTIVE REGIONS AND THE ELECTROLYTE THEREBY PROVIDING AN OXYGEN SENSOR; A REFERENCE ELECTRODE FOR THE FIRST HYDROGEN ELECTRODE SURROUNDING AT LEAST PARTIALLY AND SPACED FROM THE METAL SURFACED BASE MEMBER OF THE ELECTRODE LEAD; TRODE CONTAINING AN ELECTROCHEMICALLY ACTIVE REGION OF SILVER AND A SILVER HALIDE, A LAYER OF ELECTRICAL INSULATION DISPOSED BETWEEN THE METAL SURFACE BASE MEMBER OF THE ELECTRODE LEAD AND THE REFERENCE ELECTRODE., AND ELECTRODE, AND CONTACTING BOTH THE ELECTROCHEMICALLY ACTIVE REGIONS OF PALLADIUM OXIDE AND A PH ELECTRODE COMPRISING A SEPARATE PORTION OF THE METAL PERMEABLE, ION-IMPERMEABLE DIFFUSION BARRIER MATERIAL ENCAPSULATING AT LEAST THE ELECTROCHEMICALLY ACTIVE REGIONS AND THE ELECTROLYTE THEREBY PROVIDING A CARBON DIOXIDE SENSOR; AND A PH ELECTRODE COMPRISING A SEPARATE PORTION OF THE METAL SURFACED BASE MEMBER OF THE ELECTRODE LEAD AND AN ELECTROCHEMICALLY ACTIVE REGION OF PALLADIUM OXIDE ADHERING TIGHTLY TO AND IN ELECTRICAL CONTACT WITH THE METAL SURFACED BASED MEMBER AND EXPOSED EXTERIORLY OF THE OUTER SHEATHS.