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Biosensor, thin film electrode forming method, quantification apparatus, and quantification method

  • US 8,480,878 B2
  • Filed: 01/11/2011
  • Issued: 07/09/2013
  • Est. Priority Date: 11/15/1999
  • Status: Expired due to Fees
First Claim
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1. A biosensor for quantifying a substrate in a sample liquid comprising:

  • an insulating support;

    a working electrode formed from an electrically conductive layer that is made of a noble metal and is provided on a surface of the insulating support;

    a reagent layer on the working electrode;

    a spacer layer provided on and covering part of the reagent layer, where the spacer layer defines a supply path for bringing the sample liquid into contact with the reagent layer and where the supply path formed by the spacer layer is narrower than the reagent layer; and

    a cover provided on the spacer layer, where the cover comprises a counter electrode formed from an electrically conductive layer that is made of a noble metal and is provided on an inner surface of the cover;

    wherein a portion of the counter electrode and a portion of the working electrode are in the supply path, andwherein part of the reagent layer is in the supply path.

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