Patent ID: RE42567

Claim:
A biosensor An apparatus for use in determining a concentration of a component in an aqueous liquid sample, the biosensor apparatus comprising: (a) an electrochemical cell, the electrochemical cell comprising a first electrically resistive substrate having a first thin layer of a first electrically conductive material on a first face, a second electrically resistive substrate having a second thin layer of a second electrically conductive material on a second face, the substrates being disposed with the first electrically conductive material facing the second electrically conductive material and being separated by a sheet comprising an aperture, the wall of which aperture cooperates with the electrically conductive materials to define a cell wall, and wherein the aperture defines a working electrode area in the cell, the cell further comprising a sample introduction aperture whereby the aqueous liquid sample may be introduced into the cell, (b) a socket region having a first contact area in electrical communication with the first thin layer of the first electrically conductive material on the first electrically resistive substrate and a second contact area in electrical communication with the second thin layer of the second electrically conductive material on the second electrically resistive substrate, wherein the socket region extends the full width of at least one of the first and second electrically resistive substrates, and the first and second electrically resistive substrates have lengths that are different from one another in the socket region; and (c) a measuring circuit, the measuring circuit being electrically connectable with the electrochemical cell by engaging with the socket region.