Electrochemical test sensor with reduced sample volume
First Claim
1. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
- 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, wherein the dielectric window comprises a first window section, a second window section and a third window section and a first portion of the capillary space encompasses an area of the first window section and an area of the second window section and a second portion of the capillary space is encompassed by an area of the third window section, 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 by at least a portion of the area of the second window section, wherein an exposed portion of the counter electrode for being exposed to the fluid test sample is defined by at least the portion of the area of the second window section and further defined by at least the second portion of the capillary space.
2 Assignments
0 Petitions
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.
20 Citations
17 Claims
-
1. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
-
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, wherein the dielectric window comprises a first window section, a second window section and a third window section and a first portion of the capillary space encompasses an area of the first window section and an area of the second window section and a second portion of the capillary space is encompassed by an area of the third window section, 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 by at least a portion of the area of the second window section, wherein an exposed portion of the counter electrode for being exposed to the fluid test sample is defined by at least the portion of the area of the second window section and further defined by at least the second portion of the capillary space. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
-
11. An electrochemical test sensor for detecting the concentration of an analyte in a fluid test sample, the electrochemical test sensor comprising:
-
a base that provides a flow path for the fluid test sample; a dielectric layer located between the base and the lid, the dielectric layer forming a dielectric window therethrough; 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 dielectric window comprises a first window section, a second window section and a third window section and a first portion of the capillary space encompasses an area of the first window section and an area of the second window section and a second portion of the capillary space is encompassed by an area of the third window section, wherein the reagent layer is located between the base and the lid, and 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, and further defined by at least a portion of the area of the second window section and further defined by the second portion of the capillary space. - View Dependent Claims (12, 13, 14, 15, 16)
-
-
17. A method for determining a concentration of an analyte in a fluid sample with a test sensor, the method comprising:
-
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, a dielectric layer located between the base and the lid, the dielectric layer forming a dielectric window therethrough, 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 dielectric window comprises a first window section, a second window section and a third window section and a first portion of the capillary space encompasses an area of the first window section and an area of the second window section and a second portion of the capillary space is encompassed by an area of the third window section, 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 by at least a portion of the area of the second window section and further defined by at least the second portion of the capillary space; 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.
-
Specification