Analysis method, analysis device and production method therefor

• US 7,815,861 B2
• Filed: 10/07/2003
• Issued: 10/19/2010
• Est. Priority Date: 10/08/2002
• Status: Expired due to Term

• Current Assignee: ARKRAY, Inc
• Original Assignee: ARKRAY, Inc
• Inventors: Tanji, Hideki
• Primary Examiner(s): Warden; Jill
• Assistant Examiner(s): TURK, NEIL N
• Application Number:
  US10/530,725
• Publication Number:
  US 20060153738A1
• Time in Patent Office: 2,569 Days
• Field of Search: 422/82.05, 422/68.1, 422/82.09, 435/22
• US Class Current: 422/82.05
• CPC Class Codes: G01N 21/274 Calibration, base line adjustment, drift correction
• CPC Class Codes: G01N 21/77 by observing the effect on a chemical indicator
• CPC Class Codes: G01N 21/8483 Investigating reagent band test-element handling not specific to a test method G01N33/4875; analytical elements specific to chemical analysis of biological material G01N33/52; autometer with reagent band G01N35/04
• CPC Class Codes: Y10T 29/49002 Electrical device making

Abstract

The present invention relates to a technique for analyzing the concentration of a specific component in a sample liquid, such as a method for analyzing a sample. The analyzing method includes a first detection step for irradiating light from a light source (50) onto a reaction system to detect a response from the reaction system (56) as a first detection result. The reaction system contains a sample liquid and a reagent. The method also includes a second detection step for irradiating light onto a reference board (54) to detect a response from the reference board as a second detection result. The response from the reference board under light irradiation is dependent on wavelength. The method further includes a calculation step for calculating the concentration of the specific component in the sample liquid based on the first and second detection results.

Claims

1. An analyzing method comprising:

a relation determination step of determining a relationship between variations of reflectivity and variations of wavelength with respect to a reference board whose reflectivity varies continuously as the wavelength of light irradiated onto the reference board varies, the variations of the wavelength of irradiated light being caused by environmental temperature changes that also cause fluctuations of reflectivity;

a first detection step of irradiating light onto a reaction system to detect an amount of light reflected from the reaction system as a first detection result, the reaction system including a sample liquid and a reagent;

a second detection step of irradiating light onto the reference board to detect an amount of light reflected from the reference board as a second detection result; and

a calculation step of calculating the wavelength of irradiated light based on the second detection result and the relationship between variations of reflectivity and variations of wavelength with respect to the reference board while also calculating a concentration of a specific component in the sample liquid based on the first detection result and the calculated wavelength of irradiated light.

2. The analyzing method according to claim 1, wherein the calculation step includes selecting a most suitable calibration curve from a plurality of pre-created calibration curves based on the second detection result, and calculating the concentration of the specific component based on the selected calibration curve and the first detection result.

3. The analyzing method according to claim 1, wherein the calculation step further includes correcting the first detection result based on the second detection result, and calculating the concentration of the specific component based on the correction and a calibration curve.

4. The analyzing method according to claim 1, wherein the calculation step further includes performing primary calculation of the concentration of the specific component, and obtaining a final calculated value by correcting the primary calculated value.

5. An analyzing device comprising:

a storage that stores a relationship between variations of reflectivity and variations of wavelength with respect to a reference board whose reflectivity varies continuously as the wavelength of light irradiated onto the reference board varies, the variations of the wavelength of irradiated light being caused by environmental temperature changes that also cause fluctuations of reflectivity;

a light irradiator for irradiating light toward a reaction system and the reference board, the reaction system including a sample liquid and a reagent;

a detecting unit arranged to face the reaction system and the reference board for detecting an amount of light reflected from the reaction system under light irradiation from the light irradiator as a first detection result, the detecting unit detecting an amount of light reflected from the reference board under light irradiation from the light irradiator as a second detection result; and

a calculator connected to the detecting unit and the storage configured to calculate the wavelength of irradiated light based on the second detection result and the predetermined relationship between variations of reflectivity and variations of wavelength with respect to the reference board while also configured to calculate a concentration of a specific component in the sample liquid based on the first detection result and the calculated wavelength of irradiated light.

6. The analyzing device according to claim 5,

wherein the storage also stores a plurality of calibration curves each representing a relationship between the first detection result and the concentration of the specific component;

the analyzing device further comprising a selector connected to the calculator and the storage for selecting a most suitable calibration curve for calculation from the plurality of calibration curves based on the second detection result;

the calculator configured to calculate the concentration of the specific component based on the calibration curve selected by the selector and the first detection result.

7. The analyzing device according to claim 5, wherein the calculator is configured to correct the first detection result based on the second detection result and is configured to calculate the concentration of the specific component based on the correction.

8. The analyzing device according to claim 5, wherein the calculator is configured to perform primary calculation of the concentration of the specific component based on the first detection result, and is configured to calculate a final value by correcting the primary calculated value.

9. The analyzing device according to claim 5, further comprising a controller connected to the detecting unit and the calculator configured to control timing for detection of the second detection result at the detector.

10. The analyzing device according to claim 9, wherein the controller is further configured to control the detector for detecting the second detection result before or after the detection of the first detection result, or simultaneously with the detection of the first detection result.

11. The analyzing device according to claim 9, wherein the controller is further configured to control the detector for detecting the second detection result upon start-up of the analyzing device.