Minimally invasive sensor system

A - Human Necessities – 61 – B

Patent

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Details

A61B 5/00 (2006.01) A61B 10/00 (2006.01)

Patent

CA 2347378

The invention relates to a minimally invasive sensor system for determining the concentration of substances in the human body. Sensor systems of this type are used in medical diagnosis, for example, for determining the concentration of glucose in blood or in the interstitial liquid, during the treatment of diabetics. The inventive minimally invasive sensor system is comprised of a hollow probe (3) which is provided for withdrawing a fluid from tissues and which is arranged on a support (2). A sensor (S) with a sensor element is also arranged on the support. The sensor (S) comprises a flow-through channel which is in spatial contact with the sensor element and which is directly connected to the interior of the hollow probe (3). The connection can also be provided with the aid of a hollow body connection (4). Micro-fluidic elements are used for the hollow probe (3), the hollow body connection (4) and for the sensor (S) so that the sensor (S) can carry out direct and continuous measurements of substance concentrations of liquids which are withdrawn from the tissue via the hollow probe (3).

L'invention concerne un système de capteur à invasion minimale pour la détermination de la concentration de substances dans le corps humain. On utilise de tels systèmes de capteur dans le diagnostic médical, par exemple pour déterminer la concentration de glucose dans le sang ou dans le liquide interstitiel lors du traitement des diabétiques. Le système de capteur selon l'invention comporte une sonde cannelée (3), disposée sur un support (2), pour prélever un liquide dans des tissus. Le support comporte, en outre, un capteur (S) comportant un élément détecteur et un canal d'écoulement en contact avec l'élément détecteur et raccordé directement à l'intérieur de la sonde cannelée (3). Le raccord peut également se faire à l'aide d'un raccord creux (4). On utilise, pour la sonde cannelée (3), le raccord creux (4) et le capteur (S), des éléments microfluidiques de manière à obtenir des mesures directes et continues, par le capteur (S), des concentrations de substances dans les liquides prélevés dans le tissu au moyen de la sonde cannelée (3).

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