Electrochemical coagulation assay and device

G - Physics – 01 – N

Patent

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Details

G01N 33/49 (2006.01) A61B 5/15 (2006.01) B01L 3/00 (2006.01) G01N 11/00 (2006.01) G01N 27/30 (2006.01) G01N 33/543 (2006.01) A61B 10/00 (2006.01)

Patent

CA 2399811

Methods and devices for electrochemically detecting a change in the viscosity of a fluid are provided. In the subject methods, a fluid sample is introduced into an electrochemical cell having oppositely spaced apart working and reference electrodes. An electric potential is applied to the cell to first achieve a steady state cell current. A decrease in the steady state cell current is then detected and related to a change in viscosity of the sample. In many embodiments, the sample is blood and the change in viscosity is related to the onset of coagulation in the blood sample, and often the PT of the blood sample. Also provided are test strips, kits thereof and meters for use in practicing the subject methods.

L'invention concerne des méthodes et des dispositifs destinés à détecter, par voie électrochimique, un changement de viscosité d'un fluide. Ces méthodes consistent à introduire un échantillon de fluide dans une cellule électrochimique comprenant des électrodes de référence actives espacées. On applique un potentiel électrique à cette cellule en vue d'obtenir un courant de cellule stable. On détecte alors une diminution du courant de cellule stable, puis on associe cette diminution à un changement de viscosité de l'échantillon. Dans plusieurs modes de réalisation, on utilise un échantillon de sang, le changement de viscosité étant associé au début de la coagulation dans cet échantillon de sang, et notamment au temps de prothrombine dudit échantillon de sang. L'invention concerne également des bandes d'essai, des trousses associées et des compteurs destinés à la mise en oeuvre des méthodes susmentionnées.

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