Sensor system for determining the concentration of glucose...

A - Human Necessities – 61 – B

Patent

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A61B 5/00 (2006.01) G01N 11/14 (2006.01) G01N 11/16 (2006.01)

Patent

CA 2503896

The inventive sensor system contains an implantable sensor (1') and a control unit assigned thereto. A sensitive liquid is enclosed inside said sensor (1'), and glucose can penetrate into the sensor. The viscosity of the mixture comprised of the sensitive liquid and of the glucose is measured. The control unit, which controls the measuring and the evaluation of the measurement, consists of a portable unit to be worn externally on the skin. The viscosity is measured on the basis of the rotation of a measuring element (35), which is located inside the sensor (1') and which can be driven by a drive magnet (24) also located inside the sensor (1'). The rotation of the measuring element (35) is analyzed based on the subsiding behavior thereof after the drive magnet (24) is switched off. In a second embodiment, the viscosity of the mixture is measured on the basis of the oscillatory behavior of an oscillating element, which is located inside the sensor and which can be set in oscillatory motion by a magnet also located inside the sensor. The oscillatory behavior is analyzed based on the subsiding behavior of the oscillating element after the magnet is switched off.

L'invention concerne un système capteur contenant un capteur implantable (1') et un appareil de commande affecté audit capteur. Le capteur (1') renferme un liquide sensible dans lequel du glucose peut pénétrer. La viscosité du mélange de liquide sensible et de glucose ainsi formé est alors mesurée. L'appareil de commande commandant la mesure et son évaluation se présente sous la forme d'un appareil portable destiné à être porté de façon externe sur la peau. La mesure de la viscosité est effectuée sur la base d'une rotation d'un organe de mesure (35) présent dans le capteur (1'), pouvant être entraîné par un aimant d'entraînement (24) également présent dans le capteur (1'). La rotation de l'organe de mesure (35) est analysée après coupure de l'aimant d'entraînement (24) sur la base de la décroissance de ladite rotation. Dans un deuxième mode de réalisation, la mesure de la viscosité est effectuée sur la base du comportement oscillatoire d'un organe oscillant présent dans le capteur, excité par un aimant également présent dans le capteur. Le comportement oscillatoire dudit organe est analysé après coupure de l'aimant sur la base de la décroissance des oscillations.

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