Active pulse blood constituent monitoring

A - Human Necessities – 61 – B

Patent

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A61B 5/1455 (2006.01)

Patent

CA 2221864

A blood glucose monitoring system (100) is disclosed which provides for inducing an active pulse in the blood volume of a patient. The induction of an active pulse results in a cyclic, and periodic change in the flow of blood through a fleshy medium (310) under test. By actively inducing a change of the blood volume, modulation of the volume of blood can be obtained to provide a greater signal to noise ratio. This allows for the detection of constituents in blood at concentration levels below those previously detectable in a non-invasive system. Radiation which passes through the fleshy medium is detected by a detector (320) which generates a signal indicative of the intensity of the detected radiation. Signal processing is performed on the electrical signal to isolate those optical characteristics of the electrical signal due to the optical characteristics of the blood.

L'invention se rapporte à un système de contrôle de la glycémie (100), qui permet d'induire une impulsion active dans la circulation sanguine d'un patient. L'induction de cette impulsion se traduit par une modification cyclique et périodique du courant sanguin dans un milieu constitué de chair (310) placé sous contrôle. En induisant activement une modification de la circulation sanguine, il est possible de moduler le volume de sang afin d'entraîner une augmentation du rapport signal/bruit. Cela permet de détecter les constituants du sang à des niveaux de concentration inférieurs aux niveaux décelés antérieurement avec un système non invasif. Le rayonnement qui traverse le milieu constitué de chair est décelé par un détecteur (320) qui engendre un signal indiquant l'intensité du rayonnement décelé. Un traitement est appliqué aux signaux électriques afin d'isoler les charactéristiques optiques des signaux électriques en question qui sont imputables aux charactéristiques optiques du sang.

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