Fibre optic sensor

G - Physics – 01 – N

Patent

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Details

G01N 21/77 (2006.01) A61B 5/00 (2006.01)

Patent

CA 2600563

A sensor for measuring the concentration of an assay substance, such as oxygen in tissue. The sensor comprises an optical fibre (2) which passes through, a gas isolation collar (11) into a cavity (15) defined by a needle tube (13) attached to the gas isolation collar. Both the optical fibre (2) and the needle tube (13) are bonded to the gas isolation collar (11) in gas-tight fashion. The cleaved end (8) of the optical fibre within the cavity is provided with an optically active substance (9) having optical properties, such as fluorescence, dependent on the concentration of the assay substance. The cavity (15) is filled with a polymer (16) which is permeable to the assay substance. Lateral flow passages (18) are provided for the assay substance to pass into the permeable polymer (16) and to the fluorophor (9). Light is supplied to the fluorophor via the optical fibre, and functions of its fluorescence are measured to calculate the concentration of the assay substance.

Cette invention se rapporte à un capteur destiné à mesurer la concentration d~une substance de dosage, comme de l~oxygène dans un tissu. Le capteur comprend une fibre optique (2) passant à travers, un collier d~isolation du gaz (11) dans une cavité (15) définie par un tube d~aiguille (13) relié au collier d~isolation de gaz. La fibre optique (2) comme le tube d~aiguille (13) sont reliée au collier d~isolation de gaz (11) de façon étanche au gaz. L~extrémité clivée (8) de la fibre optique à l~intérieur de la cavité est munie d~une substance active sur le plan optique (9) ayant des propriétés optiques, telles que la fluorescence, dépendant de la concentration de la substance de dosage. La cavité (15) est remplie avec un polymère (16) perméable à la substance de dosage. Des passages de flux latéraux (18) sont fournis pour que la substance de dosage puisse passer dans le polymère perméable (16) et au fluorogène. La lumière est envoyée sur le fluorogène via la fibre optique, et les fonctions de sa fluorescence sont mesurées pour calculer la concentration de la substance de dosage.

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