Analyte Monitoring Device and Methods of Use
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Abstract
An analyte monitor includes a sensor, a sensor control unit, and a display unit. The sensor has, for example, a substrate, a recessed channel formed in the substrate, and conductive material disposed in the recessed channel to form a working electrode. The sensor control unit typically has a housing adapted for placement on skin and is adapted to receive a portion of an electrochemical sensor. The sensor control unit also includes two or more conductive contacts disposed on the housing and configured for coupling to two or more contact pads on the sensor. A transmitter is disposed in the housing and coupled to the plurality of conductive contacts for transmitting data obtained using the sensor. The display unit has a receiver for receiving data transmitted by the transmitter of the sensor control unit and a display coupled to the receiver for displaying an indication of a level of an analyte. The analyte monitor may also be part of a drug delivery system to alter the level of the analyte based on the data obtained using the sensor.
15 Citations
29 Claims
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1. (canceled)
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2. A method for processing sensor data from a dual-electrode continuous analyte sensor configured for exposure to a circulatory system of a host in vivo the method comprising:
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applying a dual-electrode continuous analyte sensor to a host, wherein the sensor comprises a first working electrode disposed beneath an enzymatic portion of a membrane system and a second working electrode disposed beneath a non-enzymatic portion of the membrane system, wherein the enzymatic portion comprises an enzyme for detecting an analyte and the non-enzymatic portion comprises no enzyme or an inactive form of the enzyme; receiving a first signal from the first working electrode associated with the analyte and non-analyte related electroactive compounds, and receiving a second signal from the second working electrode associated with the non-analyte related electroactive compounds, wherein the non-analyte related electroactive compounds have an oxidation potential that substantially overlaps with an oxidation potential of the analyte; estimating a scaling factor, wherein the scaling factor defines a relationship between the first working electrode and the second working electrode; and processing the first signal and the second signal to obtain a signal substantially without contribution due to non-analyte related electroactive compounds, wherein the processing comprises using the scaling factor. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for measuring an analyte, comprising:
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a continuous analyte sensor configured for exposure to a circulatory system of a host in vivo the continuous analyte sensor comprising a first working electrode disposed beneath an enzymatic portion of a membrane system and a second working electrode disposed beneath a non-enzymatic portion of the membrane system, wherein the enzymatic portion comprises an enzyme for detecting the analyte and the non-enzymatic portion comprises no enzyme or an inactive form of the enzyme; a vascular access device configured for fluid contact with a circulatory system of the host, wherein the sensor is located in or on the vascular access device; a receiving module configured to receive a first signal from the first working electrode and a second signal from the second working electrode, wherein the first signal is associated with the analyte and non-analyte related electroactive compounds, and the second signal is associated with the non-analyte related electroactive compounds, wherein the non-analyte related electroactive compounds have an oxidation potential that substantially overlaps with an oxidation potential of the analyte; and a processor module configured to process the first signal and the second signal and to estimate a scaling factor, wherein the scaling factor defines a relationship between the first working electrode and the second working electrode, and wherein the processor module is configured to process the first signal and the second signal using the scaling factor, whereby a signal substantially without contribution due to non-analyte related electroactive compounds is obtained. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A system for measuring an analyte, comprising:
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a continuous analyte sensor configured for continuous measurement of an analyte in vivo comprising a first working electrode configured to generate a signal comprising analyte and non-analyte components and a second working electrode configured to generate a second signal comprising a non-analyte related component; and a processor module configured to process the first signal and the second signal using a scaling factor, whereby a signal substantially without contribution due to the non-analyte component is obtained, wherein the scaling factor defines a relationship between the first working electrode and the second working electrode. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29)
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Specification