Intravascular catheter probe for clinical oxygen, ph and co2...

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01)

Patent

CA 2275231

Methods and apparatus for the measurement of oxygen, pH and CO2 in human and animal tissue is provided in which the compounds preferably comprise a chromophore and/or fluorphor capable of absorbing an amount of energy and subsequently releasing the energy w phosphorescent and/or fluorescent light, and wherein the phosphorescence is quenched by molecular oxygen according to the Stern-Volmet relationship. CO2 is measured by a fluorphor wliich alters fluorescence with pH. The apparatus includes an optical fiber (2) for transmitting light to a probe (70) that includes a gas permeable film (10) enclosing a portion (12) of the distal end of the optical fiber to form a reservoit (14) of a solution of the oxygen quenchable phosphorescent compound and/or the fluorescence emitting compound. The apparatus alsc includes a light source (36) and a light detector (34).

La présente invention concerne des procédés et un appareil de mesure de l'oxygène, du pH et du CO¿2? dans des tissus humains ou animaux. Selon cette invention, les composés comportent, de préférence, un chromophore et/ou un fluorophore susceptible d'absorber une quantité d'énergie et de libérer l'énergie ultérieurement sous forme de lumière phosphorescente et/ou fluorescente; l'intensité de la phosphorescence est réduire par de l'oxygène moléculaire selon la relation Stern-Volmer. Le CO¿2? est mesuré par un fluorophore qui modifie la fluorescence grâce au pH. L'appareil comporte une fibre optique (2) destinée à transmettre de la lumière à une sonde (70). Ladite fibre comporte un film perméable au gaz (10) entourant une partie (12) de l'extrémité distale de la fibre optique en vue de former un réservoir (14) d'une solution réalisé à partir du composé phosphorescent de l'oxygène dont l'intensité peut être réduite et/ou du composé à émission fluorescente. L'appareil comporte également une source lumineuse (36) et un photodétecteur (34).

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