JPS6156943A - Biochemical measuring apparatus - Google Patents

Abstract

PURPOSE:To make the measuring operation accurate, by detecting the coloration degree of a test paper, processing the result by a signal processing system, displaying the measured value, counting the color reaction time after the test paper is set by a counting means, and displaying the remaining time of the reaction. CONSTITUTION:An optical system 3 optically detects the coloration degree of a test paper 2b, which is immersed in a sample to be detected and undergoes color reaction. The signal from the system 3 is operated and processed by a signal processing system 4. The measured value is displayed on a display system 5. After the test paper 2b is set, the color reaction time is counted based on an operation signal by a counting means. The remaining time with respect to the counted reaction time is displayed on a remaining time display means. Thus erroneous operation can be prevented, and the prevention of the erroneous detection can be ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a biochemical measuring device for measuring urine sugar, etc., and particularly relates to a display function of color reaction time on a test strip.

(0) Prior Art Conventionally, for example, in a urine test, a test piece was immersed in urine and the degree of coloration of the test paper was visually compared with a colorimetric table. However, this poses a problem in that there are many measurement errors, etc. Therefore, urine sugar measuring devices using optical instruments have been developed.

This urine sugar measuring device consists of an optical system, a signal processing system, and a display system.The test piece consists of a stick with a test paper attached to the tip, and this test piece is placed in the optical system. ing. When the test paper is immersed in urine, a color reaction occurs, and the degree of coloration is detected by an optical system and converted into an electrical signal.

This signal is processed by a signal processing system to calculate the urine sugar concentration, and this urine sugar concentration is displayed on the display system.

(c) The problem that the invention aims to solve: The above-mentioned test strip uses an enzyme that reacts with components in urine (urine sugar) to produce other substances and is involved in the color development of two pigments. . After this enzyme begins to react with urine components,
The reaction is not completed until a predetermined period of time has elapsed.

However, since conventional urine sugar measuring devices do not display any color reaction time, there is a possibility that the user may erroneously perform the measurement before the predetermined time has elapsed, leading to the risk of reading an incorrect value. there were.

This invention was made in view of this point.

It is an object of the present invention to provide a biochemistry measuring device that enables accurate measuring operations by displaying the remaining time of color reaction.

B) Means and operation for solving the problems This invention has the following features:
A test paper that causes a color reaction when immersed in the sample to be detected;
an optical system that optically detects the degree of coloration of the test strip; a signal processing system that processes signals from this optical system to calculate measured values; and a display that displays the measured values from this signal processing system. system, a counting means that counts the color reaction time based on an operation signal that operates after the test strip is installed, and a remaining time that indicates the remaining reaction time counted by the counting means.
After installing the test strip,

When a measurement switch or the like is pressed, the counting means starts counting a predetermined reaction time and the display means 9 displays the remaining time.

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

As shown in FIGS. 1 to 4, 1 is a urine sugar measuring device, which measures the urine sugar concentration based on the degree of coloration of a test piece 2, and an optical system 3. It is configured to be portable and includes a signal processing system 4 and a display system 5.

This test piece 2 is constructed by sticking a small piece of test paper 2b to the tip of a #I long plate-shaped stick 2a. This test paper 21) uses an enzyme that reacts with a component (urine sugar) in urine, which is a sample to be detected, to produce other substances and is involved in the color development of 9 pigments.

The reaction between this enzyme and urine components is completed after a predetermined period of time has elapsed, so the test piece 2 is immersed in urine for this color reaction time (
For example, 60 seconds).

On the other hand, case 6 of urine sugar measuring device @1 has an almost rectangular shape.
In FIG. 3, the left half is a measurement section 6a, and the right half is an operation display section 6b. Then, the optical system 6 is connected to the measuring section 6a, the display system 5 is connected to the operation display section 6b,
Further, a signal processing system 4 is housed over the measuring section 6a and the operation/display section 61).

An L-shaped opening/closing lid 7 is pivotably supported on the measurement part 6a so as to be able to rotate up and down, and an insertion part 8 for the test piece 2 is formed inside. It is configured to be installed through the

Optical system 3 includes 9 light emitting diodes 9 and photodiodes 10
It is configured in a transmitted light system. The light emitting diode 9 is mounted on the opening/closing lid 7, and the photodiode 10 is mounted on the floor plate of the insertion section 8 facing each other.
The test piece 2 is placed between the 10 and 10 spaces.

The operation display section 6b includes a measurement display window 11. An operation display window 12 is provided, as well as a calibration switch 1 and a measurement switch 14, and a power switch 15 and AC adapter jack 16 are provided on the side.
Although not shown, a printed circuit board is provided and a battery storage section is also formed.

The display system 5 is composed of a 7-segment light emitting diode, faces the measurement display window 11, and is designed to indicate the measured value in three digits. Incidentally, the operation display window 12 is designed to indicate whether the amount of input light is too large or too small, or whether the battery voltage is low.

The signal processing system 4 is configured to convert the current value from the photodiode 10 into a voltage value with an I/V converter 17 and into a digital value with an A/D converter 18, and input the converted values to the CPU 9. There is. Furthermore.

C'PU19 has comparison 'iE'& measurement switch 13.1.
4, a switching signal is input, and 2 light emitting diodes 9
An operation signal is output to the display system 5 and the reaction end buzzer 20. A linear calibration curve is set in the CPU 19 that shows the relationship between the current value of the degree of coloration and the urine sugar concentration. Then, the degree of coloration of the unused test strip 2b is measured by the signal from the calibration switch 16, zero blank correction of the calibration curve is performed, and the urine sugar concentration is determined based on the calibration curve from the degree of coloration of the test strip 2b after soaking in urine. It is designed to detect.

Further, the CPU 19 includes a counting means for counting the color reaction time, and this counting means is adapted to count down for 30 seconds in response to a signal from the measurement switch 14. The remaining time counted down by the counting means is displayed by a remaining time display means, and the display system 5 also serves as this display means.

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

First, to explain the calibration operation, open the opening/closing lid 7, insert the unused test piece 2 into the insertion part 8, and insert the light emitting diode 9.
The test paper 2b is placed between the photodiode 10 and the photodiode 10, and the opening/closing lid 7 is closed.

Subsequently, after turning on the power switch 15, when the calibration switch 13 is pressed, the nine light emitting diodes 9 emit light. This light passes through the test paper 2b and the stick 2a and is received by the photodiode 10. The electrical signal corresponding to the amount of transmitted light is sent to the I/V converter 17:' A/D process 1
8□. PU19 is cool.

Zero blank correction of the calibration curve is performed based on this signal, and the calibration curve is calibrated based on the color of the unused test paper 2b itself. This completes the calibration operation.

Open the opening/closing lid 7, take out the test piece 2, and test paper 2])
Soak in urine.

Next, moving on to the actual measurement operation, this actual measurement operation will be explained based on the flow diagram of FIG. First, in ST1, the test piece 2 soaked in urine is inserted into the insertion section 8 in the same manner as during calibration. and,
When the measurement switch 12 is turned on in ST2, this switching signal causes the counting means to count down for 30 seconds in ST. That is, when the test strip 21) is immersed in urine, a coloring reaction occurs with urine sugar, and the progress of the actual measurement operation is interrupted until this coloring reaction is completed. Each time of this 30 second countdown is sequentially displayed on the 9 display system 5 (remaining time display means) in ST4.
．． j8. It is shown as...

The measurer will be notified.

After that, when the color reaction is completed after 30 seconds have passed, the 9 display becomes 0 seconds, and the buzzer 20 is activated in ST5.
1 to notify the measuring person, and at ST6 the light emitting diode 9 emits light and measurement is performed. This light passes through the test paper 2b etc. and enters the photodiode 10, as in the case of calibration, and is converted into an electrical signal corresponding to the amount of transmitted light and sent to the CPU.
19.

Using this area, the urine sugar concentration is calculated based on the calibration curve,
The measured value is displayed on the display system 5 in ST7 (for example, 32 fQ/dJ). This completes the measurement.

In addition, although this embodiment described the urine sugar measuring device 1,
This invention can be applied to other biochemical measurement devices that measure blood sugar and the like.

Further, the counting time of the counting means is set by the measurement object and the test paper 2b, and the remaining time display means may be provided separately from the display system 5.

Further, the optical system 6 and the like are not limited to those in the embodiment, but may be of a reflected light type, for example.

(F) Effects of the Invention As described above, the biochemical measuring device of the present invention counts the reaction time until the color reaction of the test strip is completed and displays the remaining time. By performing measurement operations before completion, it is possible to reliably prevent erroneous operations.

Erroneous detections such as reading incorrect values can be reliably prevented.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a flow diagram of the actual measurement process of the urine sugar measuring device, FIG. 2 is a circuit block diagram of the urine sugar measuring device, FIG. 3 is a perspective view of the same, and FIG. Figure 4 is a plan view of the same. 1: Urine sugar measuring device, '2: Test piece. 2a: test paper, 2b: test paper. 3 = optical system, 4: signal processing system, 5: display system. 9: Light emitting diode, 10: Photo diode,
14: Measurement unit, 19: CPU. 20: Buzzer. Patent applicant Tateishi Electric Co., Ltd. Patent attorney Shigeru Nakamura) -” to O

Claims (1)

[Claims] (1) A test paper that causes a color reaction when immersed in a sample to be detected, an optical system that optically detects the degree of coloration of this test paper, and a measurement value that is calculated by processing the signals from this optical system. a signal processing system for displaying the measured values from the signal processing system, a counting means for counting the color reaction time using an operation signal after the test strip is installed, and a reaction counted by the counting means. 1. A biochemical measurement device comprising: a remaining time display means for indicating the remaining time.