Measurement of substances in liquids

Details Measurement of substances in liquids Measurement of substances in liquids

G - Physics

01

N

G01N 33/487 (2006.01) A61B 5/00 (2006.01) C12Q 1/00 (2006.01) C12Q 1/54 (2006.01) G01N 27/49 (2006.01) G01N 33/66 (2006.01)

Patent

CA 2402139

In a method of measuring the concentration of a substance such as glucose in a sample liquid such as blood or interstitial fluid, a measuring device is provided having a working sensor part (6b), a second working sensor part (8b) and a reference sensor part (4b). The sample liquid is applied to the measuring device and an electric current proportional to the concentration of the substance in the sample liquid is measured at each sensor part (6b, 8b). The electric currents are compared to establish the difference. If the difference is greater than a predetermined threshold, an error indication is given. A disposable test strip with two working sensors (6b, 8b) is also disclosed.

La présente invention concerne un procédé permettant de mesurer la concentration d'une substance telle que du glucose dans un échantillon liquide tel que du sang ou un fluide interstitiel. Ce procédé met en oeuvre un dispositif de mesure pourvu d'une partie capteur actif (6b), d'une seconde partie capteur actif (8b) et d'une partie capteur de référence (4b). On applique le liquide de l'échantillon à ce dispositif de mesure et on mesure au niveau de chaque partie capteur (6b, 8b) un courant électrique proportionnel à la concentration de la substance présente dans le liquide de l'échantillon. On compare ces courants électriques de façon à établir la différence. Si cette différence est supérieure à un seuil prédéterminé une indication d'erreur est donnée. Cette invention concerne aussi une languette d'essai jetable avec deux capteurs actifs (6b, 8b).

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