JP3684458B2 - Color test paper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a colored test paper, and more particularly to a stick-shaped colored test paper having a test piece that develops color when a specimen is applied.
[0002]
[Prior art]
Color test paper is used as a means for easily analyzing components contained in human or animal body fluids, such as blood, sweat, urine, or the like, or components contained in water and sewage, factory wastewater, or soil. Color test paper is well known as litmus paper, but a test piece containing a reagent that develops color when a specimen is applied is attached to the tip of stick-shaped paper. Yes, it is possible to analyze the components contained in the specimen from the change in color tone.
[0003]
For example, the urine sugar level is measured with a urine component test paper as a method for examining the blood glucose level by a non-invasive method. As shown in FIG. 6, the urine component test paper for examining the urine sugar value is obtained by attaching a test piece 14 containing a reagent to the tip of a stick-shaped paper base 12. When urine is applied to the portion of the test piece 14, the color develops in a different color tone depending on the amount of sugar (glucose) contained in the urine. In order to relate the color tone of color development to the urine sugar value, a standard color tone table is created, and color tone table symbols such as −, ±, (+), +, ++, +++, etc. are attached according to the color tone of the color development. For example, when it is ±, it is determined that the urine sugar value is 50 mg / deciliter. Thus, since the measurement of the urine sugar value by the urine component test paper is simple, it is also used by the subject to grasp the change in the blood glucose level by himself / herself.
[0004]
Moreover, as disclosed in Patent Document 1, a urine component test paper in which a plurality of test pieces are provided on one test paper is also used. For example, three test pieces for detecting urine sugar level, protein, and occult blood are provided on one test paper, and three urine components can be determined based on the color of each test piece by applying urine once. can do.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 9-318625 [0006]
[Problems to be solved by the invention]
The inventor of the present invention invented a portable urine analyzer suitable for using a conventional urine component test paper, and filed an application as Japanese Patent Application No. 2002-227533. This portable urine analyzer includes a housing having a test paper holding portion for holding a urine component test paper, a waterproof detection window provided in a part of the housing and facing a test piece, and provided in the housing for detection. A light emitting / receiving sensor that measures color development of a test piece on which a specimen is placed through a window, and a pair of conductive terminals protruding from the housing are provided. Then, by measuring the electrical conductivity between the pair of conductive terminals, it is detected that the urine has been applied, and the second unit for determining the color tone of the color after starting to apply urine to the urine component test paper. It is characterized by facilitating time management.
[0007]
Through the invention according to the above application, the inventor of the present application has realized that more appropriate specimen analysis can be performed by making some improvements in the color test paper. In other words, the conventional color test paper is based on the premise that it can be grasped by hand and applied to the specimen and the color change of the color of the test piece is discriminated with the naked eye, as used in urine component test paper. As shown in FIG. 6, for example, a test piece is simply attached to one side of a stick-like white paper. Therefore, when a conventional color test paper is attached to a sample analyzer such as a portable type, the sample is put on the test piece, and the color tone is measured by a sensor provided opposite to the colored test piece, the color test paper is used. From the viewpoint of, there are the following problems.
[0008]
First, the conventional color test paper is generally white stick-shaped paper as a base, and the test piece is affixed on one side of the paper. When measuring the change of the light, the light transmitted through the white paper base may sneak into the sensor and affect the measurement result.
[0009]
Secondly, a conventional color test paper has a test piece attached to one side thereof. When a sensor that measures the change in color tone is arranged opposite to the test piece, when the specimen is placed on the color test paper, for example, there is a housing containing the sensor on the sensor side. The specimen is applied from the surface opposite to the side to which is attached. Therefore, even if the sample is applied to the colored test paper, there is a possibility that the sample is not supplied promptly and sufficiently to the test piece attached to the back surface thereof.
[0010]
Thirdly, in the conventional color test paper, a test piece is attached to a simple rectangular stick-like base on the assumption that it is originally held by hand. Therefore, for example, the position of the sensor for measuring the change in color tone and the position of the test piece are opposed to each other, and a function that can be quickly removed after use is not sufficiently provided.
[0011]
As described above, the conventional color test paper is difficult to position on a sample analyzer such as a portable type, and it is difficult to quickly supply a sufficient sample to the test piece. It has a problem that it is easy to remove after use.
[0012]
An object of the present invention is to provide a color test paper that solves the problems of the prior art and reduces the wraparound of light that affects the measurement of color change. Another object is to provide a colored test paper that can supply a sufficient amount of specimen to the test piece quickly. Yet another object is to provide a colored test strip that facilitates positioning and removal from the sample analyzer.
[0013]
[Means for Solving the Problems]
In order to achieve the above-described object, the color test paper according to the present invention includes a stick-like base having a grip part to be gripped by a finger, a sticking part to stick a test piece on one surface, and affixed to the sticking part. The base is colored with at least one side black and has a light-shielding property, and external light that hinders the detection of the color development. It is characterized by light shielding by the base.
[0014]
With the above configuration, the stick-like base to which the test piece is attached has light shielding properties. Therefore, it is possible to reduce the influence of the color development on the measurement of the color tone change of the test piece that develops color when the sample is applied by blocking the wraparound of light by the light shielding base.
[0015]
The base having a front Symbol shielding properties has a wraparound opening of the specimen, the specimen was subjected to back surface of the surface of the sticking portion is characterized in that around to the test piece.
[0016]
With the above configuration, the sample wraparound opening is provided in the stick-shaped base. Therefore, even if the sample is applied to the surface on the back side of the surface having the affixing portion, it is easy to go around to the test piece side, and a sufficient amount of sample can be supplied to the test piece quickly.
[0017]
Moreover, it is preferable to have a tongue-like cut and bent portion that extends from the base toward the wraparound opening of the specimen. By appropriately bending the cut and bent portion, the applied specimen is guided, and even when the specimen is applied to the back side of the surface having the sticking portion, it is easier to go around the test piece.
[0018]
The base having a front Symbol shielding property, has a narrow neck portion of the stick width, wherein the gripping portion is bent from the constricted portion.
[0019]
With the above configuration, for example, if a positioning member corresponding to the shape of the constricted portion is arranged in the sample analyzer, the test piece can be easily positioned using the constricted portion. In addition, when the sample analysis on the test piece is completed and the colored test paper is used up, it can be bent at the constricted portion to release the locking state between the positioning member and the constricted portion of the sample analyzer. The color test paper can be easily removed.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a case where the specimen is urine, that is, a urine component test paper will be described, but a color test paper used for detection of a specimen other than urine may be used.
[0021]
Color test papers other than urine component test papers include PH test paper, semi-quantitative ion test paper, analytical test paper, simple water quality test paper, and the like. Semi-quantitative ion test paper includes nitrite ion test paper for detecting nitrite concentration in food additives, nitrate ion test paper for detecting nitrate nitrogen concentration in soil, metals in drinking water and industrial wastewater. It includes a test paper for aluminum ions for detecting ion concentration, a test paper for copper ions, a test paper for metal ions such as a test paper for nickel ions, an ascorbate test paper for detecting vitamin C concentration contained in fruit juice and the like. The test paper for analysis includes zinc test paper for analyzing zinc components, chlorine test paper for analyzing residual chlorine, tin test paper for analyzing tin components, and hexavalent chromium test paper for analyzing hexavalent chromium components. Etc.
[0022]
As a sample applied to the color test paper attached to the portable sample analyzer, for example, a liquid such as factory waste water can be used as it is. Also, for example, when targeting soil components, dry the soil to be inspected, add purified water and stir well, filter the soil solution with a suitable filter paper, etc., and use this as the sample. Can do.
[0023]
To put a sample on a color test paper, literally pour the sample onto the color test paper, and for example, collect a sample such as industrial wastewater in a container and attach the color test paper to the sample in the container. It is also possible to immerse the portable sample analyzer.
[0024]
FIG. 1 shows a side view of (a) and a top view of (b) the urine component test paper 20. In the figure, the urine component test paper 20 includes a stick-shaped base 22 and three circular test pieces 24 attached to one surface of the base 22.
[0025]
The base 22 is made of a sheet of paper or plastic, and at least one surface is colored with a light-shielding color such as black and has a light-shielding property. Alternatively, at least one surface may be covered with a metal foil such as an aluminum foil to have a light shielding property.
[0026]
The base 22 has a holding part 26 for roughly holding with a finger and an attaching part 28 for attaching the test piece 24. An opening 30 is provided in a part of the region of the grip portion 26, and a tongue-shaped cut and bent portion 32 extending from the base 22 is provided in the opening 30. As shown in the figure, the cut and bent portion 32 is bent in the direction of the surface opposite to the surface to which the test piece 24 is attached.
[0027]
In addition, the base 22 is provided with a pair of constricted portions 34a and 34b. The pair of constricted portions 34 a and 34 b are provided one by one symmetrically on both side surfaces of the base 22 between the position where the opening 30 is provided and the position where the test piece 24 is attached. The shape of the pair of constricted portions 34a and 34b can be formed by a substantially semicircular notch as shown in the figure. Instead of the semicircular shape, other concave notches such as a rectangular notch may be used.
[0028]
The three test pieces 24 are pads containing different reagents. For example, when urine is applied, each reacts to urine sugar level, protein, and occult blood, and each develops a unique color.
[0029]
In the above configuration, since three test pieces are used, the opening is provided in the region of the gripping part, and the pair of constricted parts is provided between the position where the opening is provided and the position where the test piece is attached. However, these arrangements may be changed depending on the number of test pieces. For example, when there is one test piece to be attached, an opening may be provided in the attaching part.
[0030]
The operation of the urine component test paper 20 having the above configuration will be described with reference to FIGS. In addition, although the test piece is described as three circular shapes, this is an exemplification, and may be a different number or a shape such as a rectangle other than the circular shape. FIG. 2 shows an example of a portable urine analyzer 300 suitable for performing urine analysis using the urine component test paper 20. In the figure, (a) is a top view, (b) is a front sectional view, and (c) is a bottom view. In the portable urine analyzer 300, the urine component test paper 20 is attached to a waterproof housing 316, and the color change of the color of the test piece that develops color by applying urine is changed to three pieces provided in a part of the housing 316. Measurement is performed by a light emitting / receiving sensor disposed inside the housing 316 through a circular detection window 374, and the result is converted into a urine sugar value or the like and displayed on a numerical display 326 or a bar graph display 325. It is a device to do.
[0031]
The housing 316 is provided with a concave urine pool portion 350 that accumulates urine applied thereto, and a groove-shaped urine flow path 352 that extends from the urine pool portion 350 toward the detection window 374. The urine pool portion 350 is a concave portion in which the housing 316 is greatly recessed, and is provided with a width of, for example, about 6 times the width of the urine component test paper 20. The urine flow path 352 is a groove formed to have a width that matches the width of the urine component test paper 20, and a pair of weir portions 354a and 354b that narrow the flow channel in front of the end portion 361 and upper portions on both sides of the groove. Overhang portions 356a and 356b and a pair of protrusion portions 358a and 358b are provided on both sides of the position near the urine pool portion 350. These are used for positioning when the urine analysis test strip is attached to the housing 316, as will be described later.
[0032]
On the urine flow path 352 on the urine pool 350 side, a pair of conductive terminals 372 a and 372 b are provided so as to protrude from the housing 316. The pair of conductive terminals 372a and 372b is connected to a urine detector built in the housing 316, and detects that urine has been applied from a change in electrical conductivity between the pair of conductive terminals 372a and 372b. Functions as a terminal.
[0033]
3A and 3B are views showing a state in which the urine component test paper 20 is attached to the portable urine analyzer 300, where FIG. 3A is a top view, FIG. 3B is a front sectional view, and FIGS. corresponds to b). In order to attach the urine component test paper 20 to the housing 316, the holding part 26 of the urine component test paper 20 is held with a finger, the surface on which the test piece 24 is affixed is opposed to the upper surface of the housing 316, and the affixing part 28 is It is inserted from the urine pool 350 side toward the urine flow path 352 side so as to pass under the pair of overhang portions 356a and 356b. As the insertion proceeds, the pair of constricted portions 34a and 34b of the urine component test paper 20 fit into the pair of protruding portions 358a and 358b of the housing 316. In this state, the tip portion of the urine component test paper 20 is placed on the upper surfaces of the pair of dam portions 354a and 354b, and the three circular test pieces 24 of the urine component test paper 20 are provided in the housing 316. It will be positioned in the upper part of each circular detection window 374 in a facing relationship.
[0034]
In a state where the urine component test paper 20 is positioned and attached to the housing 316, the urine pool portion 350 provided in the housing 316 exposes indentations having a sufficiently large size on both sides of the urine component test paper 20. Yes. Further, the opening 30 of the urine component test paper 20 opens toward the substantially central portion of the urine pool 350. The cut and bent portion 32 is bent outward as viewed from the urine pool portion 350.
[0035]
FIG. 4 is a view showing a state where the portable urine analyzer 300 to which the urine component test paper 20 is attached is held by hand and the urine 400 is put on. The applied urine 400 enters the urine pool 350 through the opening 30 with the cut and bent portion 32 as a guide or from both sides of the urine component test paper 20, and is stored there. When urine is filled between the pair of conductive terminals 372a and 372b by the stored urine 402, the electrical conductivity between them decreases, and it is detected that urine has been applied. Accordingly, the light receiving / emitting sensor starts to operate by an electronic circuit (not shown). The accumulated urine 402 flows through the urine flow path 352 continuing from the urine pool portion 350 and reaches the gap between the test piece 24 and the detection window 374 facing each other.
[0036]
Thus, although the urine 400 is applied from the surface side opposite to the surface on which the test piece 24 of the urine component test paper 20 is attached, the test piece 24 is formed by the opening 30 and the cut and bent portion 32. It is possible to easily go around the affixed surface side and supply the urine to the test piece 24 quickly and sufficiently.
[0037]
When the collected urine 402 flows through the urine flow path 352 and is supplied to the test piece 24, the test piece 24 starts to develop color, and its color change is measured by a light receiving and emitting sensor through the opposing detection window 374. Is done. At this time, since the base 22 of the urine component test paper 20 has a light-shielding property, the influence of external light transmitted through the base 22 can be almost eliminated. Further, the shape of the test piece 24 and the shape of the detection window 374 are both made circular, or the groove width of the urine flow path 352 is formed by a groove having a width matched to the width of the pasting portion 28 of the urine component test paper 20. Thereby, the light which wraps around from the side surface etc. of the urine component test paper 20 can also be suppressed more.
[0038]
FIG. 5 is a diagram illustrating a state in which the measurement of the color tone change of the test piece 24 that has been colored by supplying urine is completed, the urine component test paper 20 is used up, and is removed from the housing 316. In the figure, (a) is a sectional front view of the housing 316 to which the urine component test paper 20 is attached, and (b) is a top view of the urine component test paper 20. When the urine component test paper 20 is used up, as shown by an arrow A in the figure, hold the holding part 26 with a finger and raise it on the upper surface side of the housing 316. The urine component test paper 20 has a pair of constricted portions 34 a and 34 b, which have a so-called notch effect, and that portion fits into the protruding portion of the housing 316. Therefore, when the gripping portion 26 is raised in the direction of the arrow A shown in the figure, the line connecting the pair of constricted portions 34a and 34b can be bent as a bending line.
[0039]
By this bending, the engagement between the pair of constricted portions 34a and 34b and the protruding portion of the housing is released. Therefore, the urine component test paper 20 can be easily removed from the housing 316 by holding the bent gripping portion 26 and sliding it in the direction of arrow B shown in the figure.
[0040]
As described above, according to the urine component test paper having the above-described configuration, it is possible to reduce the wraparound of light that affects the measurement of the change in color tone, and it is possible to quickly and sufficiently supply urine to the test piece. In addition, the portable urine analyzer can be easily positioned and removed.
[0041]
【The invention's effect】
According to the color test paper according to the present invention, it is possible to reduce the wraparound of light that affects the measurement of the change in color tone. According to the colored test paper according to the present invention, it is possible to quickly and sufficiently supply the specimen to the test piece. The colored test paper according to the present invention can be easily positioned and removed from the sample analyzer.
[Brief description of the drawings]
FIG. 1 is a side view (a) and a top view (b) of a urine component test paper in an embodiment according to the present invention.
FIG. 2 is a diagram showing an example of a portable urine analyzer suitable for performing urine analysis using a urine component test paper according to an embodiment of the present invention.
FIG. 3 is a diagram showing a state in which the urine component test paper in the embodiment according to the present invention is attached to the portable urine analyzer.
FIG. 4 is a diagram showing a state in which urine is applied with the urine component test paper attached to the portable urine analyzer according to the embodiment of the present invention.
FIG. 5 is a diagram showing a state when the urine component test paper in the embodiment according to the present invention is used up and removed from the portable urine analyzer.
FIG. 6 is a side view (a) and a top view (b) of a conventional urine component test paper.
[Explanation of symbols]
12, 22 base, 14, 24 test piece, 20 urine component test paper, 26 gripping part, 28 sticking part, 30 opening part, 32 cutting and bending part, 34a, 34b constricted part, 300 urine analyzer, 316 housing, 325 326 display, 350 urine pool, 352 urine flow path, 354a, 354b weir, 356a, 356b overhang, 358a, 358b protrusion, 372a, 372b conductive terminal, 374 detection window, 400, 402 urine.

Claims (4)

A stick-like base having a gripping part to be gripped by a finger and an attaching part for attaching a test piece on one surface;
A test piece that is affixed to the affixing part and that develops color when the specimen is applied;
In color test paper containing
The color test paper , wherein the base is colored at least on one side in black and has a light shielding property, and external light that prevents detection of the color development is shielded by the base. In the color test paper according to claim 1 ,
The base has a specimen wraparound opening, and the specimen placed on the back side of the surface having the sticking part wraps around the test piece. In the color test paper according to claim 2,
A color test paper having a tongue-like cut and bent portion extending from the base toward a wraparound opening of the specimen. In the color test paper according to claim 1 ,
The colored test paper, wherein the base has a constricted portion with a narrow stick width, and the grip portion is bent from the constricted portion.

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