Dual electrode system for a continuous analyte sensor

  • US 8,929,968 B2
  • Filed: 07/19/2010
  • Issued: 01/06/2015
  • Est. Priority Date: 12/05/2003
  • Status: Active Grant
First Claim
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1. A sensor for continuously measuring a concentration of an analyte in a biological fluid, the sensor comprising:

  • a substrate;

    a first conductive layer disposed over at least a portion of the substrate and comprising a first electrode, the first electrode comprising a first electroactive surface;

    a first insulating layer disposed over at least a portion of the first conductive layer;

    a second conductive layer disposed over at least a portion of the first insulating layer and comprising a second electrode, the second electrode comprising a second electroactive surface;

    a second insulating layer disposed over at least a portion of the second conductive layer, wherein the first electroactive surface and the second electroactive surface are separated by a distance such that diffusion of measured species between the first electroactive surface and the second electroactive surface is substantially reduced or eliminated; and

    a third conductive layer disposed over at least a portion of the second insulating layer and comprising a third electrode;

    wherein the first insulating layer is configured to provide insulation between the first conductive layer and the second conductive layer, and wherein the second insulating layer is configured to provide insulation between the second conductive layer and the third conductive layer.

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