Rapid-read gated amperometry devices
First Claim
Patent Images
1. A method for determining a concentration of an analyte in a sample, comprising:
- receiving the sample at a sample reservoir of a test sensor, the sample including a biological fluid;
applying, by a signal generator of a measurement device, an electrical input signal to the sample via a sensor interface including at least two electrodes extending or projecting into the sample reservoir, the sample being in electrical communication with the signal generator of the measurement device, wherein the electrical input signal has at least 3 duty cycles within 30 seconds, and wherein each of the at least 3 duty cycles includes an excitation pulse and a relaxation;
measuring, by a processor of the measurement device via the sensor interface, an electrical output signal responsive to a measurable species within 300 milliseconds from a start of an excitation pulse of at least one of the at least 3 duty cycles, the measurement of the electrical output signal terminating prior to an end of the excitation pulse of the at least one of the at least 3 duty cycles, wherein a pulse width of the excitation pulse of the at least one of the at least 3 duty cycles is from 0.1 to 2 seconds;
determining, by the processor of the measurement device, the concentration of the analyte in the sample based on the measured electrical output signal; and
causing to be displayed on a display device an indication of the concentration of the analyte.
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Abstract
A sensor system, device, and methods for determining the concentration of an analyte in a sample is described. Input signals including multiple duty cycles of sequential excitation pulses and relaxations are input to the sample. One or more signals output from the sample within 300 ms of the input of an excitation pulse may be correlated with the analyte concentration of the sample to improve the accuracy and/or precision of the analysis. Determining the analyte concentration of the sample from these rapidly measured output values may reduce analysis errors arising from the hematocrit effect, mediator background, and other error sources.
38 Citations
36 Claims
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1. A method for determining a concentration of an analyte in a sample, comprising:
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receiving the sample at a sample reservoir of a test sensor, the sample including a biological fluid; applying, by a signal generator of a measurement device, an electrical input signal to the sample via a sensor interface including at least two electrodes extending or projecting into the sample reservoir, the sample being in electrical communication with the signal generator of the measurement device, wherein the electrical input signal has at least 3 duty cycles within 30 seconds, and wherein each of the at least 3 duty cycles includes an excitation pulse and a relaxation; measuring, by a processor of the measurement device via the sensor interface, an electrical output signal responsive to a measurable species within 300 milliseconds from a start of an excitation pulse of at least one of the at least 3 duty cycles, the measurement of the electrical output signal terminating prior to an end of the excitation pulse of the at least one of the at least 3 duty cycles, wherein a pulse width of the excitation pulse of the at least one of the at least 3 duty cycles is from 0.1 to 2 seconds; determining, by the processor of the measurement device, the concentration of the analyte in the sample based on the measured electrical output signal; and causing to be displayed on a display device an indication of the concentration of the analyte. - 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, 29, 30)
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31. A method for determining a concentration of an analyte in a sample, comprising:
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receiving the sample at a sample reservoir of a test sensor, the sample including a biological fluid; applying, by a signal generator of a measurement device, an electrical input signal to the sample via a sensor interface including at least two electrodes extending or projecting into the sample reservoir, the sample being in electrical communication with the signal generator of the measurement device, wherein the electrical input signal has at least 3 duty cycles within 30 seconds, and wherein each of the at least 3 duty cycles includes an excitation pulse and a relaxation; measuring, by a processor of the measurement device via the sensor interface, an electrical output signal responsive to a measurable species within 300 milliseconds from the start of an excitation pulse of at least one of the at least 3 duty cycles, the measurement of the electrical output signal terminating while the excitation pulse of the at least one of the at least 3 duty cycles is still being applied to the sample, wherein a pulse width of the excitation pulse of the at least one of the at least 3 duty cycles is from 0.1 to 2 seconds; determining, by the processor of the measurement device, the concentration of the analyte in the sample based on the measured electrical output signal; and causing to be displayed on a display device an indication of the concentration of the analyte. - View Dependent Claims (32)
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33. A handheld measuring device adapted to receive a sensor strip for determining the concentration of an analyte in a sample, the handheld measuring device comprising:
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at least two electrodes configured to contact the sample; and electrical circuitry in electrical communication with the at least two electrodes, the electrical circuitry including a processor in electrical communication with a signal generator and a computer readable storage medium, wherein the processor is programmed to; cause the signal generator to apply an electrical input signal to the sample, the electrical input signal having at least 3 duty cycles within 30 seconds, each of the at least 3 duty cycles including an excitation pulse and a relaxation; measure an electrical output signal responsive to a measurable species within 300 milliseconds from a start of an excitation pulse of at least one of the at least 3 duty cycles, the measurement of the electrical output signal terminating prior to an end of the excitation pulse of the at least one of the at least 3 duty cycles, a pulse width of the excitation pulse of the at least one of the at least 3 duty cycles being from 0.1 to 2 seconds; and determine the concentration of the analyte in the sample based on the measured electrical output signal. - View Dependent Claims (34)
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35. A handheld measuring device adapted to receive a sensor strip for determining the concentration of an analyte in a sample, the handheld measuring device comprising:
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at least two electrodes configured to contact the sample; and electrical circuitry in electrical communication with the at least two electrodes, the electrical circuitry including a processor in electrical communication with a signal generator and a computer readable storage medium, wherein the processor is programmed to; cause the signal generator to apply an electrical input signal to the sample, the electrical input signal having at least 3 duty cycles within 30 seconds, each of the at least 3 duty cycles including an excitation pulse and a relaxation; measure an electrical output signal responsive to a measurable species within 300 milliseconds from a start of an excitation pulse of at least one of the at least 3 duty cycles, the measurement of the electrical output signal terminating while the excitation pulse of the at least one of the at least 3 duty cycles is still being applied to the sample, a pulse width of the excitation pulse of the at least one of the at least 3 duty cycles being from 0.1 to 2 seconds; and determine the concentration of the analyte in the sample based on the measured electrical output signal. - View Dependent Claims (36)
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Specification