JPS6183944A - Urine sugar measuring apparatus - Google Patents

Abstract

PURPOSE:To achieve a lighter weight and smaller size of an apparatus, by utilizing a microcomputer (CPU) for a signal processing system while a sheet of test paper is used and the light emitting section and the light receiving section are made in a pair to perform measurement of one kind. CONSTITUTION:This apparatus is composed of a case 3, a test piece 2 with a sheet of test paper 2b, an optical system 4 for optically detecting the degree of coloration of the test paper 2b, a CPU and the like. Then, first, an unused test piece 2 is set on an inserting section 9 to perform a zero-blank correction of calibration curve based on the color of the test paper 2b itself. Thereafter, the test piece 2 is taken out to immerse the test paper 2b into urine. With the immersion into the urine, the test paper 2b causes a coloring reaction to present color according to the concentration of urine sugar. Then, the test piece 2 is set on the inserting section 9 again and upon the end of the color reaction time, a light emitting diode 10 emits light. This light is received with a photodiode 11 and converted into an electrical signal to be inputted into a CPU20. The transmission level of the light corresponds to the degree of coloration and the concentration of the urine sugar is computed based on the calibration curve from the corresponding electrical signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a portable urine sugar measuring device for measuring urine sugar.

(b) Prior Art Conventionally, test strip methods have been widely used in urine tests because of their simplicity.

When this test paper is immersed in urine, a color reaction occurs due to urine sugar, etc., and the degree of color development was initially measured visually by comparison with a colorimetric table. However, this has the problem that individual differences occur, and even within the same person, differences occur due to physiological, psychological factors, etc. Therefore, urine measuring devices using optical instruments have been developed.

This urine measuring device places a test strip in an optical system, optically detects the degree of coloration of the test strip, processes this detection signal in a signal processing system, calculates a measured value, and calculates the measured value. It is configured to be displayed on a display system.

(c) Problems to be solved by the invention One of the purposes of the urine measuring device described above is to eliminate measurement errors caused by the naked eye, but at the same time, one of the purposes is to quickly process a large amount of specimen. There is. In other words, conventional urine measuring devices are large-sized devices installed in hospitals and the like, and are designed to automatically perform tasks that were previously performed by laboratory technicians. The optical system is also provided with a plurality of light-emitting parts and is configured to simultaneously measure urine sugar, occult blood, protein, etc., making it possible to quickly perform a variety of urine-related measurements on a large number of specimens.

However, although this method uses a simple method using test strips, it is limited to large-scale testing, has a narrow scope of use, and sacrifices simplicity, which means it can be easily measured anywhere. has been done.

On the other hand, in recent years, as home medicine has progressed, there has been an increasing demand for measuring urine sugar in general households for health management purposes. At this time, the urine measuring device mentioned above cannot be used, and
Since visual measurements are unreliable, there is a call for a completely new device to be developed.

The present invention has been made in view of the above, and an object of the present invention is to provide a portable urine sugar measuring device that uses a microcomputer to perform only one type of measurement, thereby reducing the weight and size of the device. The purpose is to

(d) Means and action for solving the problems This invention comprises a case, a test strip that causes a color reaction with urine sugar when immersed in urine, and a pair of test strips. an optical system comprising a light emitting part and a light receiving part and optically detecting the degree of coloration of the test strip; and a signal processing system comprising a microcomputer and processing the detection signal from the light receiving part to calculate the urine sugar concentration. , a display system including a display element and displaying the urine sugar concentration from the signal processing system, and a battery that supplies power to the optical system, the signal processing system, and the display system, and the case includes the optical system, the signal processing system, and the display system. It houses a processing system and a display system, a test piece is removably installed, a battery is replaceable, and it is lightweight and compact, making it portable.

(E) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 to 3, reference numeral 1 denotes a urine sugar measuring device, which measures the urine sugar concentration based on the degree of coloring of a test piece 2. A case 3 includes an optical system 4, a signal processing system 5, , a display system 6, and a battery 7 are housed, making it portable.

The test piece 2 consists of a stick 2a with a test paper 2b attached to the tip thereof, and the stick 2a is formed into an elongated plate shape from a synthetic resin such as plastic.

The test paper 2b is formed into a small rectangular piece, and only one piece is provided, and when this test paper 2b is immersed in urine, it causes a color reaction only to urine sugar, and the color changes depending on the urine sugar concentration. It is configured to be colored.

The case 3 is formed into a substantially rectangular handy type, and in FIG. 1, the left half is configured as a measuring section 3a, and the right half is configured as an operation display section 3b. An L-shaped opening/closing lid 8 is pivotally supported in the measurement part 3a so as to be able to rotate up and down, and an insertion part 9 for the test piece 2 is formed inside, and the test piece 2 can be inserted and removed via a support (not shown). It is configured so that it can be installed freely.

The optical system 4 includes a pair of light-emitting diodes 10 (light-emitting section) and a photodiode 11 (light-receiving section), and is configured in a transmitted-light manner. This light emitting diode 10 is attached to the opening/closing lid 8,
The photodiodes 11 are mounted facing each other on the floor plate of the insertion section 9, and the test piece 2 is placed between both diodes 10 and 11.

The operation display section 3b displays the urine V! Measurement display window 12 showing concentration etc.
, an operation display window 13 indicating the excessive rate of input light amount, etc. is formed, and a calibration switch 14 and a measurement switch 15 are provided on the front, a power switch 16 and an AC adapter jack 1 are provided.
7 are provided on each side. Further, although not shown, a storage section for the battery 7 is formed at the lower part of the operation display section 3b.

The battery 7 is made up of an alkaline battery or the like, is replaceable, and is configured to supply power to the optical system 4, signal processing system 5, and display system 6.

The display system 6 is composed of a 7-segment light emitting diode (light emitting element), faces the measurement display window 12, and is designed to indicate the urine sugar concentration in three digits.

The signal processing system 5 is compactly constituted by a microcomputer with electronic components such as LSI mounted on a printed circuit board, and although this printed circuit board is not shown, it is provided in the measuring section 3a and the operation display section 3b of the case 3. The case 3 is formed to be small.

This signal processing system 5 converts the current value from the photodiode 11 into a voltage value with an I/V converter 18, converts this analog value into a digital value with an A/D converter 19, and inputs the converted values to the CPU 20. It is configured as follows. Furthermore,
CPtJ20 receives a switching signal from the calibration and measurement switch 14.15, while the light emitting diode 1
0, an operation signal is output to the display system 6 and the reaction end buzzer 21. Further, a linear calibration curve indicating the relationship between the current value corresponding to the degree of coloration of the test strip 2b and the urine sugar concentration is set and stored in the CPU 20.

This calibration curve is configured such that zero blank correction is performed from the degree of coloration of the unused test paper 2b, and the urine sugar concentration is derived from the degree of coloration of the test paper 2b after soaking in urine.

Incidentally, reference numeral 22 denotes a storage section for the test strips 2 formed at a corner of the measuring section 3a of the case 3, and is designed to store a small number of test strips 2 when the case 3 is carried.

Next, the measurement operation of this urine sugar measuring device 1 will be explained.

This urine sugar measuring device is small and lightweight (less than LKIR)
The device is designed to be easy to carry, so it can be carried around the home or to a hospital for measurements. Therefore, first, the opening/closing lid 8 is opened, an unused test piece 2 is placed in the insertion section 9, the test paper 2b is positioned between the light emitting diode 1o and the photodiode 11, and the opening/closing lid 8 is closed.

Subsequently, when the power switch 16 is turned on and the calibration switch 14 is pressed, an operation signal is output from the CPU 20 and the light emitting diode IO emits light. This light passes through the test paper 2b and the stick 2a, is received by the photodiode 11, is converted into an electrical signal corresponding to the amount of transmitted light, and is sent to the CPU 2.
It is input to 0. Then, zero blank correction of the calibration curve is performed based on the color of the test paper 2b itself.

Thereafter, the lid 8 is opened, the test piece 2 is taken out, and the test paper 2b is immersed in urine. The test paper 2b undergoes a color reaction due to this continuous urine consumption, and changes color depending on the urine sugar concentration. When this test piece 2 is placed in the insertion section 9 again and the measurement switch I5 is pressed, a 30 second countdown is performed, and the time is sequentially displayed on the display system 6.
Show more.

Then, when the color reaction time reaches 0 seconds and the color reaction time ends, the buzzer 21 is driven and the light emitting diode 10 emits light. As in the case of calibration, this light passes through the test paper 2b and the like, is received by the photodiode 11, is converted into an electrical signal, and is input to the CPU 20.

This transmitted light ■ corresponds to the degree of coloration, and based on the electrical signal corresponding to this amount of light, the urine IJ! Calculate i concentration. This urine sugar concentration is displayed from the display system 6 through the display window 12 (for example, 32/d1).

Incidentally, although a light-emitting device is used as the display element in the display system 6 in this embodiment, a liquid crystal or the like may also be used.
The light emitting section and the light receiving section are not limited to the light emitting diode ()"lO and the photodiode 11.

(f) Effects of the invention As described above, according to the urine sugar measuring device of the present invention, a microcomputer is used in the signal processing system, and
By using one test paper and one pair of light-emitting and light-receiving parts to perform different types of measurements, the overall size can be made smaller and the weight can be reduced to less than 1 kg, for example. Therefore, it can be easily carried.

Moreover, since it uses batteries, measurements can be taken anywhere, not only in specialized locations such as mass screenings and hospital examination rooms, but also at home or at the bedside of a hospital. The range of use can be significantly expanded. In particular, the advantages of a simple method of measurement using test paper can be further expanded.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a perspective view of the urine sugar measuring device, FIG. 2 being a plan view thereof, and FIG. 3 being a circuit block diagram thereof. l: urine sugar measuring device, 2: test piece, 2b: test paper,
3: Case, 4: Optical system, 5
: signal processing system, 6: display system, 7: battery, 10: light emitting diode, 11: photodiode, 20: CPU. Patent distributor Tateishi Electric Co., Ltd. agent
Patent Attorney Shigeru Nakamura Figure 1'', : Urine 51'J Home Equipment L 2: iii Shunka

Claims (1)

[Claims] (1) A case, a test piece comprising a test paper that causes a color reaction with urine sugar when immersed in urine, and a pair of light emitting and light receiving parts to determine the degree of coloration of the test paper. The system includes an optical system that optically detects the urinary sugar concentration, a signal processing system that is composed of a microcomputer and processes the detection signal from the light receiving section to calculate the urine sugar concentration, and a display element that calculates the urine sugar concentration from the signal processing system. The case includes a display system for displaying images, and a battery for supplying power to the optical system, signal processing system, and display system, and the optical system, signal processing system, and display system are housed in the case, and the test piece is A urine sugar measuring device characterized by being detachably installed and having a replaceable battery.