Method and device for testing liquids

• US 4,125,372 A
• Filed: 03/19/1976
• Issued: 11/14/1978
• Est. Priority Date: 04/01/1975
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Kyoto Daiichi Kagaku
• Original Assignee: Kabushiki Kaisha Kyoto Daiichi Kagaku
• Inventors: Kishimoto, Shinichi, Kawai, Shoji, Yamada, Shigeki
• Primary Examiner(s): Marantz, Sidney
• Application Number:
  US05/668,745
• Time in Patent Office: 970 Days
• Field of Search: 23/230 B, 23/253 TP
• US Class Current: 436/169
• 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: G01N 33/521 Single-layer analytical elements
• CPC Class Codes: Y10T 436/144444 Glucose

Abstract

A method and device for testing a liquid such as urine for obtaining at least qualitative, but also quantitative, if desired, information in connection with a substance which may be present in the liquid. A reference body and at least one test body are dipped into and removed from the liquid which is to be tested, a suitable means being connected with the bodies to facilitate the dipping thereof into and the removal thereof from the liquid. The test body is capable of giving a color indication in connection with the substance while the reference body has characteristics substantially identical with those of the test cody except that the reference body is incapable of giving a color indication in connection with the substance. Thus, after removal of the bodies from the liquid the reflectivities thereof may be compared so as to give at least a qualitative, but also a quantitative, if desired, indication of the substance in connection with the liquid which is tested.

Claims

1. A device for testing a liquid for aiding in the detection of a substance in the liquid, comprising a pair of liquid-absorbent bodies one of which is a test body and the other of which is a reference body, said bodies being made of materials which have substantially identical characteristics with respect to the liquid to be tested for reacting therewith to be colored identically thereby and to have the same light-reflecting properties except that the material of said test body differs from that of said reference body in that the material of said test body is capable of giving a color indication of said substance, and means connected with said bodies for facilitating the dipping thereof into and the removal thereof from a liquid which is to be tested, whereby after thus removing the bodies from the liquid a comparison of the colors thereof will provide the desired information.

2. The device of claim 1 and wherein said test body is in the form of a color reaction test paper.

3. The device of claim 2 and wherein said reference body is identical with said test body except that said reference body is incapable of reacting with said substance if it is present in the liquid which is tested.

4. The device of claim 1 and wherein said means includes an elongated strip common to and carrying both of said bodies.

5. The device of claim 4 and wherein one of said bodies is adjacent an end of said strip while the other of said bodies is adjacent said one body.

6. The device of claim 1 and including a plurality of said test bodies all of which have characteristics with respect to the liquid to be tested which are substantially identical with those of said reference body with said test bodies differing from each other and from said reference body only in that said test bodies are respectively capable of giving color indications of a plurality of different substances, respectively, in the liquid which is tested, and said means being connected with all of said bodies for facilitating the dipping thereof into and the removal thereof from the liquid which is to be tested.

7. The device of claim 1 and including an optical means for giving an indication of the reflectivity of said bodies after removal thereof from the liquid which is tested, whereby the relative reflectivity of said bodies given by said optical means will provide a quantitative value for said substance if the latter is present in the liquid which is tested.

8. The device of claim 7 and wherein said optical means includes a meter capable of being manually set to a 100% value for the reflectivity of said reference body and for then providing a value directly giving a quantative indication of said substance from the reflectivity of said test body.

9. A method of testing a liquid such as urine, comprising steps of dipping into and removing from the liquid, in any sequence, a pair of liquid-absorbent bodies one of which is a test body for giving a color indication in connection with a substance in the liquid and the other of which is a reference body which has characteristics substantially identical with that of said test body except that said reference body is incapable of giving a color indication of the presence of said substance, and then determining a color difference, if any, between said bodies.

10. A method according to claim 9 and wherein a plurality of said test bodies for respectively providing indications of different substances in the liquid are dipped into and removed from the liquid and then compared with the reference body.

11. A method according to claim 9 and including the step of comparing the bodies with an optical means which has a meter capable of being manually adjusted to provide a percentage indication, and including the step of first adjusting the meter to provide a 100% indication in connection with the reference body and then reading the meter to determine the percentage indicated thereby in connection with the test body.

12. A method according to claim 9 and wherein the liquid which is tested is urine so that both of said bodies will be colored identically by said urine unless said urine contains said substance for providing said test body with a color different from that of said reference body.