Analyte sensors with a sensing surface having small sensing spots
First Claim
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1. A plurality of analyte sensors each comprising:
- a working electrode comprising a conductive material disposed on a substrate;
a counter electrode;
a sensing surface disposed on the conductive material of the working electrode, the sensing surface comprising two or more discontiguous sensing elements arranged thereon,wherein each discontiguous sensing element has an arcuate cross-sectional profile and semi-spherical shape, a diameter of 50 μ
m to 175 μ
m, a volume of 0.1 to 50 pico liters, and comprises an analyte-responsive enzyme; and
a flux limiting membrane that covers the discontiguous sensing elements and is in contact with the working electrode between each discontiguous sensing element; and
a sensor control unit comprising a processing circuit,wherein the sensor control unit comprising a processing circuit is configured to process factory-determined calibrated measurements that are input or stored in the sensor control unit, such that the plurality of analyte sensors are thereby factory calibrated, requiring no user calibration or recalibration.
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Abstract
Embodiments of the present disclosure relate to analyte determining methods and devices (e.g., electrochemical analyte monitoring systems) that have a sensing surface that includes two or more sensing elements disposed laterally to each other, where the sensing surface is on a working electrode of in vivo and/or in vitro analyte sensors, e.g., continuous and/or automatic in vivo monitoring using analyte sensors and/or test strips. Also provided are systems and methods of using the, for example electrochemical, analyte sensors in analyte monitoring.
62 Citations
37 Claims
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1. A plurality of analyte sensors each comprising:
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a working electrode comprising a conductive material disposed on a substrate; a counter electrode; a sensing surface disposed on the conductive material of the working electrode, the sensing surface comprising two or more discontiguous sensing elements arranged thereon, wherein each discontiguous sensing element has an arcuate cross-sectional profile and semi-spherical shape, a diameter of 50 μ
m to 175 μ
m, a volume of 0.1 to 50 pico liters, and comprises an analyte-responsive enzyme; anda flux limiting membrane that covers the discontiguous sensing elements and is in contact with the working electrode between each discontiguous sensing element; and a sensor control unit comprising a processing circuit, wherein the sensor control unit comprising a processing circuit is configured to process factory-determined calibrated measurements that are input or stored in the sensor control unit, such that the plurality of analyte sensors are thereby factory calibrated, requiring no user calibration or recalibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A method comprising:
monitoring a level of an analyte with at least a portion of at least one of a plurality of analyte sensors configured to be positioned into skin of a subject, wherein the plurality of analyte sensors each comprises; a working electrode comprising a conductive material disposed on a substrate; a counter electrode; a sensing surface disposed on the conductive material of the working electrode, the sensing surface comprising two or more discontiguous sensing elements arranged thereon, wherein each discontiguous sensing element has an arcuate cross-sectional profile and semi-spherical shape, a diameter of 50 μ
m to 175 μ
m, a volume of 0.1 to 50 pico liters, and comprises an analyte-responsive enzyme; anda flux limiting membrane that covers the discontiguous sensing elements and is in contact with the working electrode between each discontiguous sensing element; and a sensor control unit comprising a processing circuit, wherein the sensor control unit comprising a processing circuit is configured to process factory-determined calibrated measurements that are input or stored in the sensor control unit, such that the plurality of analyte sensors are thereby factory calibrated, requiring no user calibration or recalibration; and determining a level of an analyte over a period of time from signals generated by the analyte sensor. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37)
Specification