Self-powered analyte sensor
First Claim
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1. A method for monitoring a level of an analyte, the method comprising:
- electrooxidizing or electroreducing, on a working electrode within an analyte sensor assembly configured to be positioned onto a skin of a patient, a primary reactant in a presence of an analyte-responsive enzyme;
electroreducing or electrooxidizing a secondary reactant on a counter electrode within the analyte sensor assembly; and
maintaining a current directly proportional to an analyte concentration in an absence of any reference voltage, the current being maintained by a resistor disposed between the working electrode and the counter electrode, wherein the resistor has an R value chosen from within a range of R values for which the current is independent of the R value at an analyte concentration at a top of its physically relevant range.
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Abstract
Generally, embodiments of the invention relate to self-powered analyte determining devices (e.g., electrochemical analyte monitoring systems) that include a working electrode, a counter electrode, and an optional resistance value, where the working electrode includes analyte sensing components and the self-powered analyte determining device spontaneously passes a current directly proportional to analyte concentration in the absence of an external power source. Also provided are systems and methods of using the, for example electrochemical, analyte sensors in analyte monitoring.
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Citations
24 Claims
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1. A method for monitoring a level of an analyte, the method comprising:
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electrooxidizing or electroreducing, on a working electrode within an analyte sensor assembly configured to be positioned onto a skin of a patient, a primary reactant in a presence of an analyte-responsive enzyme; electroreducing or electrooxidizing a secondary reactant on a counter electrode within the analyte sensor assembly; and maintaining a current directly proportional to an analyte concentration in an absence of any reference voltage, the current being maintained by a resistor disposed between the working electrode and the counter electrode, wherein the resistor has an R value chosen from within a range of R values for which the current is independent of the R value at an analyte concentration at a top of its physically relevant range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An analyte sensor assembly configured to be positioned onto a skin of a patient and to monitor a level of an analyte, the analyte sensor assembly comprising:
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a working electrode configured to electrooxidize or electroreduce a primary reactant in a presence of an analyte-responsive enzyme; a counter electrode configured to electroreduce or electrooxidize a secondary reactant; and a resistor connected between the working electrode and the counter electrode, the resistor being configured to maintain a current directly proportional to an analyte concentration in an absence of any reference voltage, wherein the resistor has an R value chosen from within a range of R values for which the current is independent of the R value at an analyte concentration at a top of its physically relevant range. - View Dependent Claims (22, 23, 24)
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Specification