Electrochemical biosensor test strip with recognition electrode and readout meter using this test strip

• US 20030042150A1
• Filed: 09/23/2002
• Published: 03/06/2003
• Est. Priority Date: 03/22/2000
• Status: Abandoned Application

• Current Assignee: ALL Medicus Co., Ltd.
• Original Assignee: ALL Medicus Co., Ltd.
• Inventors: Lee, Jin-Woo, Choi, In-Hwan, Ryu, Jun-Oh
• Application Number:
  US10/239,469
• Publication Number:
  US 20030042150A1
• Time in Patent Office: Days
• US Class Current: 205/778
• CPC Class Codes: G01N 27/3272 Test elements therefor, i.e. disposable laminated substrates with electrodes, reagent and channels optical biosensors G01N33/52
• CPC Class Codes: G01N 27/3273 Devices therefor, e.g. test element readers, circuitry details not specific to biochemical electrodes G01N33/4875

Abstract

An Electrochemical biosensor system which can do selectively quantitative analysis of blood sugar, cholesterol and other elements in blood is disclosed. The electrochemical biosensor test strip used in this invention is provided with recognition electrode which indicates that a fixed reagent is used for what material'"'"'s quantitative analysis. The readout meter used in this invention discriminates the use of inserted test strip by auto-recognition of the location of said recognition electrode and performs predetermined algorithm. According to this invention, it has advantage that various blood elements such as blood sugar, cholesterol, GOT and GPT can be analyzed quantitatively by one readout meter.

Claims

1. (amended) An electrochemical biosensor test strip for measuring concentration of analyte electrochemically by being used with an electrochemical biosensor readout meter, comprising:

a first insulating substrate;

a plurality of electrodes formed on the first insulating substrate in a lengthwise direction;

a reagent for reacting with the analyte to generate a current corresponding to the concentration of the analyte, the reagent being fixed over the plurality of electrodes on the first insulating substrate; and

a recognition electrode formed on a predetermined position of the first insulating substrate according to use of the test strip, the recognition electrode being located on a part of the first insulating substrate inserted the readout meter, whereby the recognition electrode indicates the use of the test strip to the readout meter.

2. The electrochemical biosensor test strip as set forth in claim 1, further comprising a second insulating substrate above the first insulating substrate, and the first insulating substrate and the second insulating substrate forming a sample input entrance on the position of the first insulating substrate where the reagent is fixed.

3. The electrochemical biosensor test strip as set forth in claim 2, wherein the sample input entrance is formed of a capillary space.

4. The electrochemical biosensor test strip as set forth in claim 1, wherein the recognition electrode is arranged at a fixed position two-dimensionally on the first insulating substrate.

14. A readout meter using the electrochemical biosensor test strip as set forth in claim 1, comprising:

a device recognizing the analyte of interest of the test strip by distinguishing the position of the recognition electrode;

a working voltage generating circuit applying a working voltage to the working electrode;

a voltage converting device converting the electric current flowing through the working electrode into an analogue voltage signal;

an A/D converter converting the analogue voltage signal from the voltage converting device into a digital voltage signal;

a controller which operates the working voltage generating circuit to apply a fixed working voltage to the working electrode when the test strip is inserted into the readout meter(t0), and not to apply any voltage for a fixed period time when the sample is inserted (t1) and the digital voltage signal from the A/D converter turns to a fixed critical voltage (t2) depending on the analyte of interest, and then (t3) re-operates the working voltage generating circuit to apply the working voltage to the working electrode, and measures the concentration of the analyte by distinguishing the digital voltage signal from the applying A/D converter after a fixed period of time from the applying point of working voltage (t3).

5. (amended) An electrochemical biosensor readout meter for measuring concentration of analyte electrochemically by being used with an electrochemical biosensor test strip, comprising;

a socket device which is electrically connected to electrodes of the test strip when the test strip is inserted to the readout meter, and generating a test strip insertion signal and an test strip type signal by detecting analyte information of the test strip;

an electric current measuring device for measuring value of electric current flowing through the electrodes of the test strip, the electric current measuring device being connected electrically with the socket device;

an analyzing device which analyzes concentration of the analyte according to the electric current value measured by the electric current measuring device and the test strip type signal generated by the socket device; and

an indicating device indicating the analyzed concentration of the analyte.

6. The electrochemical biosensor readout meter as set forth in claim 5, wherein the socket device comprises an electric connection device of which the connecting terminal is formed in PCB pattern, and a compressing device electrically connecting the electrode on the test strip and the connecting terminal on the electric connection device by compressing the test strip to the electric connection device.

7. (amended) An electrochemical biosensor system comprising an electrochemical biosensor test strip and a biosensor readout meter,

wherein the electrochemical biosensor test strip includes:

a first insulating substrate;

a plurality of electrodes formed on the first insulating substrate in a lengthwise direction;

a reagent for reacting with the analyte to generate a current corresponding to the concentration of the analyte, the reagent being fixed over the plurality of electrodes on the first insulating substrate; and

a recognition electrode formed on a predetermined position of the first insulating substrate according to use of the test strip, the recognition electrode being located on a part of the first insulating substrate inserted the readout meter, whereby the recognition electrode indicates the use of the test strip to the readout meter, and

the biosensor readout meter includes;

a socket device which is electrically connected to the electrodes of the test strip when the test strip is inserted to the readout meter, and generating a test strip insertion signal and an test strip tape signal by detecting the recognition electrode of the test strip;

an electric current measuring device for measuring value of electric current flowing through the electrodes of the test strip, the electric current measuring device being connected electrically with the socket device;

an analyzing device which analyzes concentration of the analyte according to the measured electric current value and the test strip type signal; and

an indicating device indicating the analyzed concentration of the analyte.

8. (cancelled)

9. (amended) A method for operating an electrochemical biosensor readout meter measuring concentration of analyte electrochemically by being used with an electrochemical biosensor test strip, comprising the steps of:

confirming whether the test strip is inserted into the readout meter when power button is pressed;

distinguishing position of recognition electrode formed on the test strip to determined use of the test strip; and

executing process routine corresponding to the use of the test strip determined by the position of the recognition electrode.

10. The method as set forth in claim 9, wherein the confirming step further comprises the step of turning the readout meter off when the test strip is not inserted for a certain period of time.

11. The method as set forth in claim 9, wherein the confirming step further comprises the steps of confirming whether the memory button of the readout meter is pressed, and indicating after reading the values stored inside the readout meter when the memory button is pressed.

12. The method as set forth in claim 9, further comprising the step of re-operating from the test strip confirming step when the test strip slips out of the readout meter.

13. The method as set forth in claim 9, wherein the process routine executing step comprises:

confirming whether the sample is inserted;

analyzing the concentration of the analyte of interest by measuring the electric current with applying a certain voltage to the electrode on the test strip after waiting a certain period of time for the sample and the reagent to react in case the sample is inserted; and

outputting the concentration value of the analyte.

15. (amended) An electrochemical biosensor test strip for being used with an electrochemical biosensor readout meter, comprising:

a first insulating substrate;

two parallel electrodes formed on the first insulating substrate in a lengthwise direction;

a resistor connected between the two electrodes, having a predetermined resistance value for adjusting the readout meter; and

a recognition electrode indicating that the test strip is used for adjusting the readout meter by being formed on a predetermined position on the first insulating substrate.