Maintaining electrode function during manufacture with a protective layer
First Claim
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1. An electrochemical test sensor for detecting the concentration of an analyte in a fluid sample, the test sensor comprising:
- a non-conductive base having a top surface, a bottom surface, and a peripheral edge extending between the top and bottom surfaces;
a trigger electrode, a working electrode, and a counter electrode overlying the non-conductive base, the trigger electrode adjacent the peripheral edge of the base;
a protective layer overlying at least a portion of the trigger electrode;
a reactive layer on at least a portion of the working electrode, the reactive layer including an enzyme for reacting with the analyte to produce electrons which are transferred to the working electrode, wherein the protective layer and the reactive layer are spaced a sufficient distance from each other so that they do not contact each other; and
a lid overlying the base, the lid having a top surface, a bottom surface, and an outer edge extending between the top and bottom surfaces, the outer edge extending beyond the peripheral edge of the base.
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Abstract
The present disclosure relates to an electrochemical test sensor for detecting the concentration of an analyte in a fluid sample. The test sensor includes a working electrode, a counter electrode, and a trigger electrode. A temporary protective layer overlies the trigger electrode and helps to maintain the function of the trigger electrode during test sensor manufacture.
17 Citations
25 Claims
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1. An electrochemical test sensor for detecting the concentration of an analyte in a fluid sample, the test sensor comprising:
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a non-conductive base having a top surface, a bottom surface, and a peripheral edge extending between the top and bottom surfaces; a trigger electrode, a working electrode, and a counter electrode overlying the non-conductive base, the trigger electrode adjacent the peripheral edge of the base; a protective layer overlying at least a portion of the trigger electrode; a reactive layer on at least a portion of the working electrode, the reactive layer including an enzyme for reacting with the analyte to produce electrons which are transferred to the working electrode, wherein the protective layer and the reactive layer are spaced a sufficient distance from each other so that they do not contact each other; and a lid overlying the base, the lid having a top surface, a bottom surface, and an outer edge extending between the top and bottom surfaces, the outer edge extending beyond the peripheral edge of the base. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electrochemical test sensor for detecting the concentration of an analyte in a fluid sample, the test sensor comprising:
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a base including a plurality of electrodes formed thereon, the plurality of electrodes including; a working electrode having a reactive layer deposited on at least a portion of the working electrode; a counter electrode; and a reagent-free trigger electrode, wherein the trigger electrode is positioned adjacent an outermost edge of the base and includes a protective layer deposited on at least a portion of the trigger electrode, wherein the protective layer and the reactive layer are spaced sufficiently apart from one another so that they do not contact one another; and a lid overlying the base, wherein an outermost edge of the lid extends beyond the outermost edge of the base.
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15. A method of manufacturing an electrochemical test sensor for detecting the concentration of an analyte in a fluid sample, the method comprising:
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patterning a plurality of electrodes from a conductive layer overlying a base, the plurality of electrodes including at least a trigger electrode, a working electrode, and a counter electrode; depositing a protective layer overlying the trigger electrode; depositing a reactive layer overlying the working electrode, wherein the protective layer and the reactive layer are deposited a sufficient distance from one another so that they do not contact one another; positioning a spacer over the base; creating a first opening extending through the spacer and the base; creating a second opening in a lid; positioning the lid over the spacer; and excising a test sensor. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification