Low volume electrochemical sensor
First Claim
1. In an elongated electrode strip for performing an electrochemical measurement of glucose in whole blood, in which the electrodes used to perform the measurement are covered with a mesh layer that extends a distance beyond the electrodes along the length of the strip, and the mesh is covered by a liquid impervious layer in which there is an aperture that does not overlay the electrodes, the improvement comprising:
- a partial occlusion of the mesh that underlays the aperture, which partial occlusion reduces the total volume of blood needed to perform the measurement.
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Accused Products
Abstract
An electrochemical sensor electrode strip that measures analyte concentration in an aqueous sample as small as 2.5 to 2.0 μL is described. Reduction in the minimum sample size is achieved by means of a dielectric coating impregnated into peripheral regions of one or more hydrophilic mesh layers, thereby reducing sample dead volume. The mesh layers are located between an electrode support and a cover layer, which cover layer includes an aperture located upstream from an electrode arrangement.
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Citations
22 Claims
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1. In an elongated electrode strip for performing an electrochemical measurement of glucose in whole blood, in which the electrodes used to perform the measurement are covered with a mesh layer that extends a distance beyond the electrodes along the length of the strip, and the mesh is covered by a liquid impervious layer in which there is an aperture that does not overlay the electrodes, the improvement comprising:
- a partial occlusion of the mesh that underlays the aperture, which partial occlusion reduces the total volume of blood needed to perform the measurement.
- View Dependent Claims (2, 3)
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4. An electrode strip for use in an electrochemical sensor for measuring an analyte in an aqueous sample, comprising:
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an electrode support an electrode arrangement on said support, comprising a working electrode and a reference electrode, wherein said working electrode has an upstream end and a downstream end, and said reference electrode is adjacent to said downstream end of said working electrode; a hydrophilic mesh layer overlaying a sample loading area and said electrode arrangement, said sample loading area being adjacent to said upstream end of said working electrode; a cover layer defining an upper boundary of a cell volume encompassing said electrode arrangement; an aperture in said cover layer, said aperture located above and defining the boundaries of said sample loading area, with no portion of said aperture located above said electrode arrangement; a dielectric coating impregnated into peripheral regions of said mesh layer, thereby forming an occluded region of said mesh layer, said occluded region overlaying a portion of said sample loading area which lies beneath said aperture and defining side boundaries of said cell volume, said occluded region overlaying no portion of said electrode arrangement; wherein said mesh layer draws said aqueous sample from said sample loading area onto said electrode arrangement, wherein said aqueous sample contacts said working electrode and said reference electrode. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification