BIOSENSOR CHIP, BIOSENSOR SYSTEM, AND MEASURING DEVICE THEREOF

摘要

In a biosensor system and its measuring instrument which determine that a biosensor chip has been inserted and measure biological information on a biological material supplied to the biosensor chip, the size of the biosensor chip is made small, the reliability of the measuring instrument is improved, and the product life becomes long. In addition, a measurement error of the biological information is suppressed in measuring the biological information by inserting a biosensor chip, which has a sensor electrode formed of an electrode member with an electric resistance value higher than a conductive metal, into the measuring instrument. An electrode portion provided in an insertion portion 5 of a measuring instrument 1 is configured such that a ground electrode 12 is used in both a sensor insertion determining circuit 14 and a blood sugar level measuring circuit 15. In addition, a first sensor electrode 21 of the biosensor chip 20 is configured to be shared by the sensor insertion determining circuit 14 and the blood sugar level measuring circuit 15. The biosensor chip includes: the first sensor electrode 21 provided to come in contact with an insertion determining circuit side connector electrode 13 when inserted into the insertion portion 5; a second sensor electrode 22 provided such that one end thereof comes in contact with a measuring circuit side connector electrode 13 and the other end is electrically connected to a reaction portion when inserted into the insertion portion 5; and a third sensor electrode 25 provided such that one end thereof comes in contact with the ground electrode 13 and the other end is electrically connected to the reaction portion 23 when inserted into the insertion portion 5. The first sensor electrode 21 is electrically connected to the reaction portion 23 through the third sensor electrode 25.