Device and method of calibrating and testing a sensor for in vivo measurement of an analyte
First Claim
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1. A method of calibrating an analyte sensor in vivo, comprising the steps of:
- (a) providing a first predetermined stimulus to the sensor when the sensor is applied to a subject to produce a first sensor signal;
(b) measuring the first sensor signal; and
(c) determining a calibration function based on the first measured sensor signal resulting from the predetermined stimulus, whereby the calibration function when applied to further signals received from the sensor can be used to provide a calibrated output.
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Abstract
A method of calibrating an analyte sensor in vivo, by providing a first predetermined stimulus to the sensor when the sensor is applied to a subject to produce a first sensor signal, measuring the first sensor signal, and determining a calibration function based on the first measured sensor signal resulting from the predetermined stimulus. The calibration function, when applied to further signals received from the sensor, can be used to provide a calibrated output.
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Citations
59 Claims
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1. A method of calibrating an analyte sensor in vivo, comprising the steps of:
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(a) providing a first predetermined stimulus to the sensor when the sensor is applied to a subject to produce a first sensor signal;
(b) measuring the first sensor signal; and
(c) determining a calibration function based on the first measured sensor signal resulting from the predetermined stimulus, whereby the calibration function when applied to further signals received from the sensor can be used to provide a calibrated output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 58)
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14. A device for the in vivo measurement of an analyte, comprising:
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(a) an in vivo sensor for measuring the analyte and providing a signal in response to the measurement of the analyte;
(b) means for providing a first predetermined stimulus to the sensor when the sensor is applied to a subject so as to produce a first sensor signal; and
(c) electronic circuitry associated with the sensor for receiving the signal and providing a calibrated output based on the signal, wherein the electronic circuitry includes means for determining a calibration function for the sensor based on the first measured sensor signal resulting from the predetermined stimulus;
such that the function when applied to further signals received from the sensor can be used to provide a calibrated output. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 41, 44)
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23. A method for the in vivo testing of an analyte sensor which is provided to a subject as an electrode of an electrical circuit, comprising the steps of:
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(a) applying a potential to the electrode and varying the electrode potential so as to cause the electrode current to undergo at least part of a cycle which exhibits hysteresis;
(b) measuring and recording a plurality of current values on the hysteresis cycle;
(c) calculating a characteristic point on the hysteresis curve from the plurality of current values; and
(e) comparing the characteristic point with a stored value and determining from this comparison whether the sensor meets a predetermined condition. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31)
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32. A device for the in vivo measurement of an analyte, comprising:
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(a) an in vivo sensor for measuring the analyte and providing a signal in response to the measurement of the analyte;
(b) electronic circuitry associated with the sensor for receiving the signal and providing a calibrated output based on the signal;
(c) an electrical circuit in which the sensor acts as an electrode, the electrical circuit comprising means for energizing the electrode to a predetermined potential and for measuring and recording the resultant current through the electrode;
(d) means for varying the electrode potential so as to cause the current to undergo at least part of a hysteresis cycle;
(e) means for calculating a characteristic point on the hysteresis curve from the recorded current measurements; and
(f) means for comparing the characteristic point with a stored value and for determining from this comparison whether the sensor meets a predetermined condition. - View Dependent Claims (33, 34, 35, 36, 42, 45)
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37. A method for the in vivo measurement of an analyte, comprising:
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(a) providing an in vivo sensor, which acts as an electrode of an electrical circuit, to a subject for measuring the analyte, wherein the operation of the sensor is dependent on a reaction in which oxygen is required;
(b) passing a voltage through the electrode, the voltage being of a magnitude and duration sufficient to cause the electrolysis of a chemical species present in the vicinity of the sensor so as to generate oxygen;
(c) measuring the signal produced by the sensor in response to the oxygen-dependent reaction; and
(d) repeating steps (b) and (c) periodically. - View Dependent Claims (38, 39)
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40. A device for the in vivo measurement of an analyte, comprising:
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(a) an in vivo sensor for measuring the analyte and providing a signal in response to the measurement of the analyte, wherein the operation of the sensor is dependent on a reaction in which oxygen is required;
(b) electronic circuitry associated with the sensor for receiving the signal and providing a calibrated output based on the signal;
(c) an electrical circuit in which the sensor acts as an electrode, the electrical circuit comprising means for energizing the electrode to a voltage which is of a magnitude and duration sufficient to cause the electrolysis of a chemical species present in the vicinity of the sensor to provide oxygen; and
(d) means for alternately generating oxygen by electrolysis and measuring the analyte by allowing the generated oxygen to take part in the reaction. - View Dependent Claims (43, 46)
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47. A device for calibrating an analyte sensor in vivo, comprising:
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(a) a sensor for application to a subject;
(b) means for providing a first predetermined stimulus to the sensor to produce a first sensor signal;
(c) means for measuring the first sensor signal; and
(d) means for determining a calibration function based on the first measured sensor signal resulting from the predetermined stimulus, whereby the calibration function when applied to further signals received from the sensor can be used to provide a calibrated output. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 59)
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Specification