Layered enzyme compositions for use with analyte sensors
First Claim
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1. An amperometric analyte sensor apparatus comprising:
- a base layer;
a conductive layer disposed on the base layer and comprising a working electrode;
a first analyte sensing layer disposed over the conductive layer and comprising a first concentration of glucose oxidase;
a second analyte sensing layer disposed over the first analyte sensing layer and comprising a second concentration of glucose oxidase;
a third analyte sensing layer disposed over the second analyte sensing layer and comprising a third concentration of glucose oxidase; and
an analyte modulating layer disposed over the first, second and third analyte sensing layers, wherein the first concentration of glucose oxidase is greater than the second concentration of glucose oxidase and the third concentration of glucose oxidase.
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Abstract
Embodiments of the invention provide amperometric analyte sensors having optimized elements such as electrodes formed from sputtered platinum compositions as well as layers of material selected to optimize the characteristics of a wide variety of sensor elements and sensors. While embodiments of the innovation can be used in a variety of contexts, typical embodiments of the invention include glucose sensors used in the management of diabetes.
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7 Claims
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1. An amperometric analyte sensor apparatus comprising:
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a base layer; a conductive layer disposed on the base layer and comprising a working electrode; a first analyte sensing layer disposed over the conductive layer and comprising a first concentration of glucose oxidase; a second analyte sensing layer disposed over the first analyte sensing layer and comprising a second concentration of glucose oxidase; a third analyte sensing layer disposed over the second analyte sensing layer and comprising a third concentration of glucose oxidase; and an analyte modulating layer disposed over the first, second and third analyte sensing layers, wherein the first concentration of glucose oxidase is greater than the second concentration of glucose oxidase and the third concentration of glucose oxidase. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A composition of matter comprising:
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a metallic electrode; a first analyte sensing layer disposed over the metallic electrode and comprising a first concentration of glucose oxidase; a second analyte sensing layer disposed over the first analyte sensing layer and comprising a second concentration of glucose oxidase; a third analyte sensing layer disposed over the second analyte sensing layer and comprising a third concentration of glucose oxidase; and an analyte modulating layer disposed over the first, second and third analyte sensing layers, wherein the first concentration of glucose oxidase is greater than the second concentration of glucose oxidase and the third concentration of glucose oxidase.
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Specification