Device for monitoring changes in analyte concentration
First Claim
1. A system for monitoring analyte concentrations in the blood of a mammal comprisingan organization of implantable sensors, each sensor including an anode and a cathode covered by a membrane which is semi-permeable to the analyte.
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Abstract
The invention provides an electrochemical sensor system for measuring analyte concentrations in a fluid sample. The invention is particularly useful for measuring analytes such as glucose in a patient. An implantable glucose sensor includes a disc-shaped sensor body containing multiple anodes on opposing sides of the sensor body. Electrodes including an anode and a cathode are connected to a transmitter which transmits radio signals to an external receiver and computer where data is processed to yield glucose concentration figures. An enzyme layer coating the anodes specifically reacts with glucose to increase signals generated by the anodes in response to the presence of glucose. In an alternate embodiment, some of the anodes are coated with the enzyme to generate a first signal, and other anodes that are not coated generate a second signal for comparison with the first signal to eliminate effects of interfering substances on the accuracy of the glucose measurement.
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Citations
41 Claims
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1. A system for monitoring analyte concentrations in the blood of a mammal comprising
an organization of implantable sensors, each sensor including an anode and a cathode covered by a membrane which is semi-permeable to the analyte.
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8. A device for electrochemically sensing changes in the concentration of an analyte of interest comprising
a wholly subcutaneously implantable sensor body, an analyte detection mechanism contained within the sensor body, and a fibrotic coat interference inhibitor in close proximity to and exterior to the sensor body for decreasing interference with analyte detection due to formation of a fibrotic coat around the sensor body.
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26. A device for electrochemically sensing changes in the concentration of an analyte of interest comprising
an implantable sensor body supporting and defining multiple analyte detection sites, each site having an analyte-sensing electrode pair, each electrode pair including an anode and a cathode, and an enzyme composition covering at least one but not all of the electrode pairs, wherein the enzyme reacts with the analyte of interest.
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36. A device for electrochemically sensing changes in the concentration of an analyte of interest comprising
a first implantable sensor body generating a first signal, a second implantable sensor body generating a second signal, each of the first and second sensor bodies supporting and defining at least one analyte detection site, each analyte detection site having an analyte-sensing electrode pair, each electrode pair including an anode and a cathode, and an enzyme composition covering the anode of each electrode pair of the first sensor body, wherein the enzyme reacts specifically with the analyte of interest.
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38. A device for electrochemically sensing changes in the concentration of an analyte of interest comprising
an implantable sensor body supporting and defining an organization of analyte-sensing electrodes including a cathode, a first anode generating a first signal, and a second anode generating a second signal, and an enzyme composition covering the first anode, wherein the enzyme reacts specifically with the analyte of interest.
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41. A method electrochemically sensing changes in the concentration in a fluid of an analyte of interest comprising
exposing a first sensor to the fluid, wherein the first sensor generates a first signal indicative of the concentration in the fluid of an interfering substance, exposing a second sensor to the fluid, wherein the second sensor includes an enzyme that reacts specifically with the analyte of interest so that the second sensor generates a second signal indicative of the concentration in the fluid of the analyte of interest and the interfering substance, and comparing the first signal to the second signal to determine the concentration in the fluid of the analyte of interest substantially isolated from the concentration in the fluid of the interfering substance.
Specification