Patent ID: 7357851

Claim:
An electrochemical cell comprising: an insulating substrate having a plurality of layers thereon, said layers comprising: at least two conducting layers, wherein one of said conducting layers is a working electrode, said working electrode in contact with at least one reagent, wherein said at least one reagent comprises an enzyme; and at least two insulating layers, wherein said insulating substrate or at least one of said at least two insulating layers is interposed between said at least two conducting layers, wherein each major surface of each conducting layer is in contact with a major surface of said insulting substrate or a major surface of at least one of said at least two insulating layers; and a substantially uniform passage extending from a first outer side of the electrochemical cell to a second outer side of the electrochemical cell opposite the first outer side, the passage being formed through each of said at least two conducting layers and each of said at least two insulating layers to expose edges of each of said at least two conducting layers and each of said at least two insulating layers, said edges collectively forming a wall or walls of said passage, said exposed edges of said at least two conducting layers forming said working electrode and a second electrode of said electrochemical cell, the passage capable of receiving a liquid sample.