ELECTROCHEMICAL TEST SENSOR WITH REDUCED SAMPLE VOLUME
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Accused Products
Abstract
An electrochemical test sensor for detecting the analyte concentration of a fluid test sample includes a base, a dielectric layer, a reagent layer and a lid. The base provides a flow path for the test sample having on its surface a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current. The dielectric layer forms a dielectric window therethrough. The reagent layer includes an enzyme that is adapted to react with the analyte. The lid is adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the test sample thereto. At least a portion of the width of the counter electrode is greater than the width of the working electrode.
3 Citations
86 Claims
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1-66. -66. (canceled)
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67. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
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a base that provides a flow path for the fluid test sample; a dielectric layer forming a dielectric window therethrough; a reagent layer including an enzyme that is adapted to react with the analyte; and a lid adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the fluid test sample thereto, the dielectric layer and the reagent layer being located between the base and the lid; and a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current, wherein an exposed portion of the working electrode for being exposed to the fluid test sample is defined in a first dimension by the dielectric window, wherein an exposed portion of the counter electrode for being exposed to the fluid test sample is defined in the same first dimension by at least a portion of the dielectric window and at least a portion of the capillary space, the at least a portion of the dielectric window being different from the at least a portion of the capillary space. - View Dependent Claims (68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78)
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79. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
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a base that provides a flow path for the fluid test sample; a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current; a reagent layer including an enzyme that is adapted to react with the analyte; and a lid adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the fluid test sample thereto, wherein the reagent layer is located between the base and the lid, wherein an exposed portion of the counter electrode being exposed to the fluid test sample is defined at least in part by an end of the capillary space opposite of the opening. - View Dependent Claims (80, 81, 82, 83, 84, 85)
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86. A method for determining a concentration of an analyte in a fluid sample with a test sensor, the method comprising:
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providing an electrochemical test sensor including a base that provides a flow path for the fluid test sample, a counter electrode and a working electrode adapted to electrically communicate with a detector of electrical current, a reagent layer including an enzyme that is adapted to react with the analyte, and a lid adapted to mate with the base and to assist in forming a capillary space with an opening for the introduction of the fluid test sample thereto, the reagent layer being located between the base and the lid, an exposed portion of the counter electrode being exposed to the fluid test sample being defined at least in part by an end of the capillary space opposite of the opening; contacting the reagent layer with the fluid sample via the capillary space; generating an electrical signal in the test sensor in response to the presence of the analyte; and determining a concentration of the analyte in the fluid sample from the electrical signal.
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Specification