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Strip electrode with screen printing

  • US 5,682,884 A
  • Filed: 07/27/1994
  • Issued: 11/04/1997
  • Est. Priority Date: 05/05/1983
  • Status: Expired due to Term
First Claim
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1. A single use disposable electrode strip for attachment to signal readout circuitry of a sensor system to detect a current representative of a compound in a blood sample, the strip comprising:

  • a) an elongated support having a substantially flat, planar surface, adapted for releasable attachment to said readout circuitry;

    b) a first conductor extending along said surface and comprising a conductive element for connection to said readout circuitry;

    c) an active electrode on said surface in contact with said first conductor, said active electrode comprising, in a single layer on said surface an admixture of an enzyme capable of catalyzing a reaction involving a substrate for said enzyme, a conductive material, and a mediator capable of transferring electrons transferred between said enzyme-catalyzed reaction and said first conductor to create a current representative of the activity of said enzyme and representative of said compound;

    d) a second conductor extending along said surface, comprising a conductive element for connection to said readout circuitry; and

    e) a reference electrode in contact with said second conductor,said first conductor and said active electrode spaced apart from said second conductor and said reference electrode and said active electrode being sized and positioned to present a combined effective area small enough to be completely coverable by a drop of blood contacting on the active electrode, whereby said blood completes an electrical circuit across said active electrode and said reference electrode, for amperometric detection of said activity of said enzyme.

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