Analyte sensor
AssigneePercuSense, Inc.
InventorsRajiv Shah, Bradley Liang, Katherine Wolfe, Ellen K Messer, Shaun M Pendo
Life of this patent
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Abstract
A working electrode measuring the presence of an analyte is described as one embodiment. The working electrode includes a working conductor with a reactive surface that is operated at a first potential. The working electrode further includes a first transport material with properties that enable analyte flux to the reactive surface. Additionally, the working electrode has a second transport material with properties that enable reactant flux to the reactive surface, wherein the analyte flux and the reactant flux are in dissimilar directions.
Claims14
A multilayer working electrode comprising:
- a working conductor having a planar top surface including a sensing surface portion;
- an insulator layer applied to the planar top surface of the working conductor, the insulator layer having a window that exposes the sensing surface portion;
- an enzyme layer disposed on the sensing surface portion of the planar top surface of the working conductor, the enzyme layer filling the window of the insulator layer and protruding above a top surface of the insulator layer and covering a portion of the top surface of the insulator layer;
- and
- a multilayer raised boss that rises above, and protrudes away from, the top surface of the insulator layer, the multilayer raised boss covering the enzyme layer and including:
- a layer of first transport material disposed over the enzyme layer, the layer of first transport material being permeable to a target analyte and having one or more exposed lateral surfaces;
- and
- a layer of second transport material applied over a top surface of the layer of the first transport material and sealing the top surface of the layer of the first transport material over the window of the insulator layer, the second transport material being permeable to a reactant and impermeable to the target analyte.
A working electrode comprising:
- a multilayer structure that includes a working conductor between a first insulation layer and a second insulation layer, the first insulation layer having an opening that exposes a sensing surface portion of the working conductor;
- a first fill material applied to at least a portion of the sensing surface portion of the working conductor within the opening in the first insulation layer, the first fill material rising above a top surface the first insulation layer;
- and
- a raised boss that rises above, and protrudes away from, the top surface of the first insulation layer, the raised boss including:
- a first transport material applied over the first fill material, the first transport material covering the opening in the first insulation layer and a portion of the top surface of the first insulation layer around the opening, the first transport material being configured to permit analyte flux of a target analyte through one or more exposed lateral surfaces of the first transport material and to the first fill material;
- and
- a second transport material applied over and sealing a top surface of the first transport material over the opening in the first insulation layer, the second transport material being configured to permit reactant flux to the working conductor through a top surface of the second transport material, the second transport material further being impervious to the target analyte.
Dependencies are inferred from the claim text.