Electrochemical test sensor with reduced sample volume

摘要

An electrochemical test sensor for detecting the analyte concentration of a fluid test sample includes a base, a dielectric layer, a reagent layer and a lid. The base provides a flow path for the test sample having on its surface a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current. The dielectric layer forms a dielectric window therethrough. The reagent layer includes an enzyme that is adapted to react with the analyte. The lid is adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the test sample thereto. At least a portion of the width of the counter electrode is greater than the width of the working electrode.

主权项

1. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
a base that provides a flow path for the fluid test sample; a dielectric layer forming a dielectric window therethrough; a reagent layer including an enzyme that is adapted to react with the analyte; and a lid adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the fluid test sample thereto, wherein the dielectric window comprises a first window section, a second window section and a third window section and a first portion of the capillary space encompasses an area of the first window section and an area of the second window section and a second portion of the capillary space is encompassed by an area of the third window section, the dielectric layer and the reagent layer being located between the base and the lid; and a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current, wherein an exposed portion of the working electrode for being exposed to the fluid test sample is defined by at least a portion of the area of the second window section, wherein an exposed portion of the counter electrode for being exposed to the fluid test sample is defined by at least the portion of the area of the second window section and further defined by at least the second portion of the capillary space.