Patent ID: 7138041
Filing Date: 2006-11-21
Classification: G01N

Abstract:
1. An electrochemical biosensor, comprising: an insulating substrate; a layer of electrically conductive wires disposed on said insulating substrate; an electrode layer comprising a plurality of electrodes including a reference electrode and at least one electrode, and at least two contact ports adapted to connect to a measuring device, said electrode layer being disposed on said layer of electrically conductive wires except for said reference electrode; a middle insulating layer disposed on said electrode layers without covering said electrodes and said contact ports, said middle insulating layer having a slot therein, above said electrodes; an active reaction layer having substances of reactant, reaction catalyst, mediator and surfactant spread on the surface of said electrodes and defining an electrode reaction area; and an upper cover adhered to said middle insulating layer, said upper cover having a closed chamber therein disposed at a rear end of said slot and extending above and in communication with said rear end of said slot, said slot defining a capillary inflow channel to enable a sample to be rapidly introduced into and fill said electrode reaction area by capillary action upon contact with a front tip of said capillary inflow channel and flow of said sample is stopped at a certain point along said capillary inflow channel due to said chamber.