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Electrode configuration for a biosensor

  • US 10,041,901 B2
  • Filed: 03/15/2013
  • Issued: 08/07/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A biosensor, comprising:

  • a capillary chamber having an inner boundary;

    a working electrode including an effective working electrode portion positioned within the capillary chamber and comprising a main working electrode body portion and a working electrode neck extending from the main working electrode body portion, the main working electrode body portion having a generally linear configuration having an average width and the working electrode neck having a working electrode neck width that is reduced relative to the average width of the main working electrode body portion, the working electrode neck constituting the sole portion of the working electrode that extends across the inner boundary and out of the capillary chamber wherein the effective working electrode portion defines an effective working electrode area exposed to the capillary chamber including the entire area of the main working electrode body portion and an area of the working electrode neck contained within the capillary chamber; and

    a counter electrode including an effective counter electrode portion positioned within the capillary chamber and comprising a main counter electrode body portion and a counter electrode neck extending from the main counter electrode body portion, the counter electrode neck having a counter electrode neck width, the counter electrode neck constituting the sole portion of the counter electrode that extends across the inner boundary and out of the capillary chamber wherein the effective counter electrode portion defines an effective counter electrode area exposed to the capillary chamber including the entire area of the main counter electrode body portion and an area of the counter electrode neck contained within the capillary chamber,wherein the working electrode neck width is less than the counter electrode neck width, wherein the effective working electrode area is different than the effective counter electrode area,wherein the working electrode neck extends across a single inner side wall of the inner boundary of the capillary chamber and the counter electrode neck extends across the same single inner side wall of the inner boundary of the capillary chamber, andwherein a ratio between the effective working electrode area and the effective counter electrode area is independent of the relative position of the inner side wall along the reduced working electrode neck width.

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