Dual electrode system for a continuous analyte sensor

  • US 9,579,053 B2
  • Filed: 03/26/2010
  • Issued: 02/28/2017
  • Est. Priority Date: 12/05/2003
  • Status: Active Grant
First Claim
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1. A transcutaneous analyte sensor configured for insertion into a host for measuring an analyte in the host, the sensor comprising:

  • a first conductive layer comprising a working electrode, wherein the working electrode is configured to generate a signal indicative of an analyte concentration;

    a first insulative layer covering at least a portion of the first conductive layer;

    a second conductive layer covering at least a portion of the first insulative layer, wherein the second conductive layer comprises a reference or counter electrode;

    a second insulative layer covering at least a portion of the second conductive layer;

    a membrane covering at least a portion of the first electrode, wherein the membrane comprises a silicone-urethane copolymer and an acrylate polymer; and

    electronics operably connected to the working electrode and the reference electrode, and configured to process the first signal;

    wherein the working electrode and the reference or counter electrode are horizontally displaced along a longitudinal axis defined by the first conductive layer such that the second electrode extends outwardly beyond the working electrode, wherein a portion of the first insulative layer is configured to act as a diffusion barrier between the working electrode and the reference or counter electrode, and wherein the horizontal displacement comprises a distance sufficient to prevent diffusion of an electroactive species between the working electrode and the reference or counter electrode; and

    wherein the sensor comprises an in vivo portion configured for insertion into the host and an ex vivo portion configured for operable connection with sensor electronics;

    wherein the sensor is configured to extend across a skin of the host and to flex in response to a mechanical pressure and to then to regain its original shape during use.

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