Patent ID: 7998337

Claim:
A biosensor strip comprising: (a) an electrode support; (b) a first electrode disposed on said electrode support, said first electrode being a working electrode, said working electrode comprising a conductive ink deposited on an electrically conductive material, wherein said conductive ink comprises a conductive compound, an enzyme and a mediator and wherein said mediator compound consists of one of the following two formulae: where X and Y can independently be oxygen, sulphur, CR 3 R 4 , NR 3 , or N + R 3 R 4 or the functional group CZ 1 Z 2 , where Z 1 and Z 2 are electron withdrawing groups; R 1 and R 2 can independently be a substituted or unsubstituted aromatic or heteroaromatic group; and R 3 and R 4 can independently be a hydrogen atom, a hydroxyl group or a substituted or unsubstituted alkyl, aryl, heteroaryl, amino, alkoxyl, or aryloxyl group; (c) a second electrode disposed on said electrode support, said second electrode being a reference electrode/counter electrode; and (d) a third electrode disposed on said electrode support, said third electrode being a fill indicator electrode, said fill indicator electrode comprising an electrically conductive material.