Methods of using an electrochemical biosensor
First Claim
1. A method for evaluating a fluid test sample using an electrochemical sensor, the test sensor including a working electrode coupled to a first lead, and counter electrode coupled to a second lead, the counter electrode including a high-resistance portion and a low-resistance portion, the high resistance portion including a resistor, the test sensor including a reagent disposed on the working electrode that is adapted to react with glucose in a blood sample for producing an electrochemical reaction indicative of the concentration of the glucose in the blood sample, the method comprising:
- collecting a blood sample;
applying a voltage profile across the first and second leads;
measuring the current profile at the first and second leads in response to the applied voltage profile; and
determining a decay factor based on the measured current profile.
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Accused Products
Abstract
According to one embodiment of the present invention, an electrochemical sensor (10) for detecting the concentration of analyte in a fluid test sample is disclosed. The sensor (10) includes a counter electrode having a high-resistance portion for use in detecting whether a predetermined amount of sample has been received by the test sensor.
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Citations
21 Claims
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1. A method for evaluating a fluid test sample using an electrochemical sensor, the test sensor including a working electrode coupled to a first lead, and counter electrode coupled to a second lead, the counter electrode including a high-resistance portion and a low-resistance portion, the high resistance portion including a resistor, the test sensor including a reagent disposed on the working electrode that is adapted to react with glucose in a blood sample for producing an electrochemical reaction indicative of the concentration of the glucose in the blood sample, the method comprising:
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collecting a blood sample; applying a voltage profile across the first and second leads; measuring the current profile at the first and second leads in response to the applied voltage profile; and determining a decay factor based on the measured current profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for evaluating whether an electrochemical sensor is properly filled, the test sensor including a working electrode and a counter electrode, the counter electrode including a low-resistance portion and a high-resistance portion, the high-resistance portion including a resistor, the method comprising:
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introducing the fluid test sample to the electrochemical test sensor; applying a first potential between the counter electrode and the working electrode for a first predetermined time period after the fluid test sample has electrically connected the working electrode and the counter electrode; after the first predetermined time period, applying a second potential between the counter electrode and the working electrode for a second predetermined time period, the second potential having a magnitude that is greater than a magnitude of the first potential; measuring the current between the counter electrode and the working electrode at a first interval during the first predetermined time period to obtain a first current measurement; measuring the current between the counter electrode and the working electrode at a second interval during the second predetermined period to obtain a second current measurement; determining a first parameter based on the first current measurement and the second current measurement; comparing the first parameter to at least one first predetermined parameter; and notifying a user that an insufficient quantity of fluid test sample has been introduced to the electrochemical test sensor based on the comparing the first parameter to the at least one first predetermined parameter. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for evaluating whether an electrochemical sensor is properly filled, the test sensor including a working electrode coupled to a first lead, and counter electrode coupled to a second lead, the counter electrode including a low-resistance portion and a high-resistance portion, the high-resistance portion including a resistor, the method comprising:
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collecting a blood sample; applying a first potential across the first and second leads for a first predetermined time period; after the first predetermined time period, applying a second potential across the first and second leads for a second predetermined time period, the second potential having a magnitude that is greater than a magnitude of the first potential; and measuring the current at the first and second leads at at least one interval in response to the applied first potential and the applied second potential. - View Dependent Claims (18)
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19. A method of evaluating a fluid test sample that has been introduced to an electrochemical test sensor, the method comprising the acts of:
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providing the electrochemical test sensor adapted to assist in determining the concentration of an analyte in a fluid test sample, the sensor comprising a base that assists in forming an opening for introducing the fluid test sample, a working electrode coupled to the base, and a counter electrode coupled to the base, the counter electrode including a low resistance portion and a high resistance portion, the high resistance portion including a resistor; introducing the fluid test sample to the test sensor; measuring current at a plurality of time periods to obtain a plurality of current measurements; and determining a decay factor from the plurality of current measurements. - View Dependent Claims (20, 21)
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Specification