Method and system for measuring urea
First Claim
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1. A body-mountable device comprising:
- a shaped polymeric material having a channel formed therein;
a substrate at least partially embedded within the shaped polymeric material and adjacent to the channel;
an antenna disposed on the substrate;
an electrochemical sensor disposed on the substrate and comprising;
a working electrode;
a protective layer comprising a polymer permeable to urea;
a reagent that selectively reacts with urea, wherein the reagent is localized within a reagent layer disposed in the channel between the protective layer and the working electrode; and
a reference electrode; and
a controller disposed on the substrate and embedded within the shaped polymeric material, wherein the controller is electrically connected to the electrochemical sensor and the antenna, wherein the controller is configured to;
(i) measure a potentiometric voltage between the working electrode and the reference electrode related to the concentration of urea in a fluid to which the body-mountable device is exposed; and
(iii) use the antenna to indicate the measured potentiometric voltage.
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Abstract
A body-mountable urea sensing device includes an electrochemical sensor embedded in a polymeric material configured for mounting to a surface of an eye. The electrochemical sensor includes a working electrode, a reference electrode, and a reagent localized near the working electrode that selectively reacts with urea. A potentiometric voltage between the working electrode and the reference electrode is related to a concentration of urea in a fluid to which the electrochemical sensor is exposed; the voltage is measured by the body-mountable device and wirelessly communicated.
10 Citations
19 Claims
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1. A body-mountable device comprising:
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a shaped polymeric material having a channel formed therein; a substrate at least partially embedded within the shaped polymeric material and adjacent to the channel; an antenna disposed on the substrate; an electrochemical sensor disposed on the substrate and comprising; a working electrode; a protective layer comprising a polymer permeable to urea; a reagent that selectively reacts with urea, wherein the reagent is localized within a reagent layer disposed in the channel between the protective layer and the working electrode; and a reference electrode; and a controller disposed on the substrate and embedded within the shaped polymeric material, wherein the controller is electrically connected to the electrochemical sensor and the antenna, wherein the controller is configured to;
(i) measure a potentiometric voltage between the working electrode and the reference electrode related to the concentration of urea in a fluid to which the body-mountable device is exposed; and
(iii) use the antenna to indicate the measured potentiometric voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method comprising:
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exposing a working electrode and a reference electrode disposed in a body-mountable device to a fluid via a protective layer and a reagent layer disposed in a channel of the body-mountable device, wherein the protective layer comprises a polymer permeable to urea, wherein the reagent layer comprises a reagent that selectively reacts with urea, wherein the body-mountable device additionally includes an antenna and measurement electronics, and wherein the working electrode, reference electrode, antenna, and measurement electronics are disposed on a substrate that is at least partially embedded in a shaped polymeric material and adjacent to the channel; measuring, by a controller, a potentiometric voltage between the working electrode and the reference electrode related to the concentration of urea in a fluid to which the body-mountable device is exposed, wherein the controller is disposed on the substrate and embedded within the shaped polymeric material; and wirelessly indicating the measured voltage using the antenna. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification