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Biosensor

  • US 4,871,440 A
  • Filed: 07/06/1988
  • Issued: 10/03/1989
  • Est. Priority Date: 07/06/1987
  • Status: Expired due to Term
First Claim
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1. A biosensor comprising:

  • an enzyme electrode body,a foundation electrode provided on the enzyme electrode body and including a working electrode, a counter electrode surrounding the working electrode, and a reference electrode surrounding the counter electrode,an enzyme film provided on the surface of the foundation electrode and fixed with physiologically active material so that an electric signal is generated in the foundation electrode on the basis of the result of the enzyme reaction to measure the density of an objective material, and an electric circuit including terminals each connected to the respective electrodes and a means for applying a bias potential between the working electrode and the reference electrode corresponding to the change of the potential of the counter electrode.

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