Patent ID: 7323098

Claim:
A biosensor comprising: a plurality of sensor units each comprising an electrode system including a working electrode and a counter electrode on an insulating base plate and a reagent system including an oxidoreductase and an electron mediator on or near the electrode system; a sample supply inlet provided for each of the sensor units or for every some sensor units; and a plurality of controlling systems for controlling the time it takes for a sample solution to reach the reagent system from the sample supply inlet, each controlling system being provided between the sample supply inlet and each of the reagent systems of the sensor units, wherein said respective controlling systems are different from one another so that the sample solution supplied to the sample supply inlet reaches the respective reagent systems of the sensor units at different times; and wherein said sample supply inlet is provided for each of the sensor units, and the biosensor has one working electrode terminal connected in parallel to the respective working electrodes of the sensor units and one counter electrode terminal connected in parallel to the respective counter electrodes of the sensor units.