Electrochemical-sensor design
First Claim
1. An electrochemical sensor for detecting the concentration of analyte in a fluid test sample which comprises:
- 1) a base which provides a flow path for the fluid test sample having on its surface a counter electrode and a working electrode in electrical communication with a detector of electrical current;
2) a reaction layer on the surface of at least the working electrode comprising an enzyme which reacts with the analyte to produce electrons that are transferred to the working electrode; and
3) a cover which when mated with the base member forms a capillary space with an opening for the introduction of fluid test sample thereto which space contains the flow path for the fluid test sample in which the counter and working electrodes are situated so that the major portion of the counter electrode is located downstream of the opening from the working electrode with a sub-element of the counter electrode being upstream of the working electrode so that when electrical communication between only the sub-element and working electrode takes place there is insufficient flow of electrical current through the detector to constitute a valid test for the concentration of analyte in the fluid test sample and the detector is pre-programmed to emit an error signal in the event of such insufficient flow of electrical current.
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Accused Products
Abstract
Disclosed is an electrochemical sensor for detecting the concentration of an analyte such as glucose in a fluid test sample. The sensor involves a base as flow path for the fluid test sample having a working and counter electrode on its surface. The base is mated with a cover to form a capillary space to capture the fluid and the counter electrode has a sub-element located upstream in the flow path. When there is detected electrical communication only between the sub-element and the working electrode the meter, with which the sensor is in electrical communication senses that the capillary space has not completely filled with test fluid.
244 Citations
14 Claims
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1. An electrochemical sensor for detecting the concentration of analyte in a fluid test sample which comprises:
- 1) a base which provides a flow path for the fluid test sample having on its surface a counter electrode and a working electrode in electrical communication with a detector of electrical current;
2) a reaction layer on the surface of at least the working electrode comprising an enzyme which reacts with the analyte to produce electrons that are transferred to the working electrode; and
3) a cover which when mated with the base member forms a capillary space with an opening for the introduction of fluid test sample thereto which space contains the flow path for the fluid test sample in which the counter and working electrodes are situated so that the major portion of the counter electrode is located downstream of the opening from the working electrode with a sub-element of the counter electrode being upstream of the working electrode so that when electrical communication between only the sub-element and working electrode takes place there is insufficient flow of electrical current through the detector to constitute a valid test for the concentration of analyte in the fluid test sample and the detector is pre-programmed to emit an error signal in the event of such insufficient flow of electrical current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- 1) a base which provides a flow path for the fluid test sample having on its surface a counter electrode and a working electrode in electrical communication with a detector of electrical current;
Specification