Gated voltammetry devices
First Claim
1. A handheld measuring device, for determining the concentration of an analyte in a sample, wherethe device is adapted to receive a sensor strip and the device comprises:
- at least two contacts;
at least one display; and
electrical circuitry establishing electrical communication between the at least two contacts and the at least one display, where the electrical circuitry includes a processor in electrical communication with an electric charger and a computer readable storage medium,where the processor is capable of implementing a pulse sequence from the electric charger to the at least two contacts, where the pulse sequence comprises at least two duty cycles,where each of the duty cycles includes an excitation and a relaxation,where the relaxation is from 0.1 to 3 seconds and includes a current reduction to at least one-half the current flow at the excitation maxima,where the excitation includes a potential varied with time,where the processor is capable of measuring resulting currents at the at least two contacts from at least one of the excitations including the potential varied with time, andwhere the processor is capable of determining the analyte concentration in the sample in response to the at least one of the resulting currents.
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Accused Products
Abstract
A sensor system, device, and methods for determining the concentration of an analyte in a sample is described. Gated voltammetric pulse sequences including multiple duty cycles of sequential excitations and relaxations may provide a shorter analysis time and/or improve the accuracy and/or precision of the analysis. The disclosed pulse sequences may reduce analysis errors arising from the hematocrit effect, variance in cap-gap volumes, non-steady-state conditions, mediator background, a single set of calibration constants, under-fill, and changes in the active ionizing agent content of the sensor strip.
615 Citations
28 Claims
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1. A handheld measuring device, for determining the concentration of an analyte in a sample, where
the device is adapted to receive a sensor strip and the device comprises: -
at least two contacts; at least one display; and electrical circuitry establishing electrical communication between the at least two contacts and the at least one display, where the electrical circuitry includes a processor in electrical communication with an electric charger and a computer readable storage medium, where the processor is capable of implementing a pulse sequence from the electric charger to the at least two contacts, where the pulse sequence comprises at least two duty cycles, where each of the duty cycles includes an excitation and a relaxation, where the relaxation is from 0.1 to 3 seconds and includes a current reduction to at least one-half the current flow at the excitation maxima, where the excitation includes a potential varied with time, where the processor is capable of measuring resulting currents at the at least two contacts from at least one of the excitations including the potential varied with time, and where the processor is capable of determining the analyte concentration in the sample in response to the at least one of the resulting currents. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification