Reagent stripe for test strip
DCFirst Claim
1. A test strip, comprising:
- a base substrate having a working electrode and a counter electrode formed thereon and having two opposite side edges and an end edge;
a spacing layer overlying the base substrate and having a void that at least partially defines a sample-receiving chamber;
a covering layer overlying the spacing layer; and
a reagent layer disposed in the sample-receiving chamber and covering a portion of the base substrate and at least one of the electrodes, the reagent layer extending under the spacing layer to the two side edges of the base substrate and being sandwiched between the spacing layer and the base substrate.
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Abstract
A test strip having a small sample-receiving chamber on the order of less than 1 microliter. The inventive test strip includes a reagent layer that extends across the width of the test strip and also extends to the sample-receiving end, such that the edges of the reagent layer are aligned with the side and dose receiving edges of the test strip. The hydrophilic reagent extending to the dosing edge of the strip promotes wicking of the sample into the test strip. The end and side edges of the reagent layer are preferably formed as part of a cutting process that forms individual test strips from a larger web, which results in a smooth and thin reagent layer with a uniform thickness, substantially covering the entire floor of the sample-receiving chamber. The inventive mass production process helps improve the reproducibility of the quantity, location, thickness and other properties of the reagent layer, which in turn improves the accuracy of the test result.
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Citations
39 Claims
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1. A test strip, comprising:
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a base substrate having a working electrode and a counter electrode formed thereon and having two opposite side edges and an end edge; a spacing layer overlying the base substrate and having a void that at least partially defines a sample-receiving chamber; a covering layer overlying the spacing layer; and a reagent layer disposed in the sample-receiving chamber and covering a portion of the base substrate and at least one of the electrodes, the reagent layer extending under the spacing layer to the two side edges of the base substrate and being sandwiched between the spacing layer and the base substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A test strip, comprising:
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a test strip body having meter-insertion and sample-receiving ends, first and second side edges, and a central longitudinal axis disposed substantially parallel to the two opposite side edges, the test strip body defining a downstream direction from the sample-receiving end to the meter-insertion end; a base substrate defining the bottom of the test strip body and having an electrode formed thereon, the base substrate having edges aligned with the sample-receiving end and the first and second side edges of the test strip body; a spacing layer overlying the base substrate and having a void that at least partially defines a sample-receiving chamber; and a reagent layer disposed in the sample-receiving chamber and covering a portion of the base substrate and the electrode, the reagent layer being sandwiched between the spacing layer and the base substrate and extending to the first and second side edges of the base substrate and the sample-receiving end of the test strip body; and a covering layer overlying the spacing layer, the covering layer comprising a vent opening in communication with the sample-receiving chamber, the vent opening aligned with the sample-receiving chamber at a location downstream of the sample-receiving opening. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification