×

Method and apparatus for measuring sample reaction results on biosensor

  • US 8,702,923 B2
  • Filed: 01/20/2011
  • Issued: 04/22/2014
  • Est. Priority Date: 08/08/2005
  • Status: Active Grant
First Claim
Patent Images

1. An apparatus for measuring a sample reaction result on a biosensor having a working electrode, a counter electrode, and a checking electrode, the apparatus comprising:

  • switches configured to selectively connect each of the counter electrode and the checking electrode to a ground terminal;

    an amplifier configured to be connected at one terminal to a voltage source and at another terminal to the working electrode of the biosensor, so as to detect an amount of current flowing through the working electrode; and

    a microprocessor programmed to;

    control the switches so that a voltage can be applied between the working electrode and the checking electrode upon coupling of a sensor strip,detect an amount of first current flowing through the working electrode and checking electrode,control the switches so that a voltage can be applied between the working electrode and the counter electrode,detect an amount of second current flowing through the working electrode and counter electrode,determine whether or not a sample is properly injected by comparing the detected amounts of the first and second currents and a time interval between times when the first and second currents are detected with predetermined threshold values,if it is determined that the sample is properly injected, apply a voltage between the working electrode and the counter electrode and detect an amount of third current flowing through the working electrode, andacquire and display a concentration value as a sample reaction result corresponding to the detected amount of third current on a display unit.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×