JPS6166153A - Biochemical measuring apparatus - Google Patents

Abstract

PURPOSE:To enable automatic disconnection of a source switch even after careless failure of disconnection of it after termination of measurement, by installing color identification optical system of a test piece colored by a specimen material, signal processing system calculating this detecting signal into a measuring value and source disconnecting means in an apparatus provided with a display system of the result. CONSTITUTION:In a biochemical measuring apparatus 1 of urine sugar, etc., a sheet of test paper 2b which develops color by specimen element (representing sugar in case of urine sugar) impregnated with test material and a test piece 2 fixed on its end with a stick 2a are inserted in a measuring optical system 4. The optical system 4 is represented as a light transmission system of luminous diode 9 and photodiode 10 and a output of the diode 10 is transported to the CPU 19 through I/V converter 20, A/D convertor 21. The CPU 19, after processing the transported signal, sends the result to a display system 6 and if any abnormal condition is found, a buzzer B is operated. A power disconnecting means 23 is installed between CPU 19, source 18 and switch 15 and even if the switch 15 is failed carelessly to be disconnected after fermination of the measurement, the source 18 disconnected after the specified time. Thus, energy can be saved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a biochemical measuring device for measuring urine sugar, etc., and particularly relates to a power cutoff mechanism.

(b) Prior Art Conventionally, for example, in a urine test, a test piece was immersed in urine and the degree of coloration 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 is composed of an optical system, a signal processing system, and a display system, and a test piece is placed in this optical system. When this test piece is immersed in urine, a color reaction occurs due to the urine sugar, and the color changes depending on the urine sugar concentration. The degree of coloration is optically detected and converted into an electrical signal, and the urine #M concentration is calculated from this signal and displayed.

(c) Problems to be Solved by the Invention In the above-mentioned urine sugar measuring device, power is supplied from the power supply to the signal processing system by turning on the power switch, and various operations are performed. Once turned on, power continued to be supplied regardless of whether it was operated or not.

However, if the measurement is stopped midway through and the user forgets to turn off the power switch, the power supply continues, resulting in wasted power consumption. Particularly in recent years, advances in home medicine have led to the development of portable urine sugar measuring devices, which often use batteries as a power source. If this portable type device wastes power as described above, the battery must be replaced frequently, making it unsuitable for the modern energy-saving era.

This invention has been made in view of the above, and an object of the present invention is to provide a biochemical measurement device that automatically shuts off the power when the user forgets to turn off the power, thereby reducing unnecessary power consumption. This is the purpose.

(D) Means for Solving Problems and 3'FWI This invention provides a test piece that causes a color reaction due to a substance to be detected, and an optical system that optically detects the degree of coloration of this test piece. , a signal processing system that calculates measured values from optical system signals based on operation signals, a display system that displays the measured values of this signal processing system, and a power supply that supplies power to these optical systems, signal processing systems, and display systems. and a power cutoff means that cuts off the power if the operation signal is not inputted for a predetermined period of time when power is supplied from the power supply, and is configured to automatically cut off the power if no operation is performed for a predetermined period of time. There is.

(E) Embodiment Hereinafter, one embodiment of the present invention will be explained in detail with reference to the drawings.

As shown in Figures 1 to 4, 1 is a urine sugar measuring device;
The urine sugar concentration is measured based on the degree of coloration of the test piece 2. The urine sugar measuring device 1 is configured to be portable, with an optical system 4, a signal processing system 5, and a display system 6 housed in a case 3.

Test piece 2 is a small piece of test paper 2b attached to the tip of stick 2a.
The test paper 2b is structured so that when it is immersed in urine, a coloring reaction occurs due to the urine sugar, and the test paper 2b changes color in accordance with the urine sugar concentration.

The case 3 is formed into a substantially rectangular body, and in FIG. 3, the left half serves as a measuring section 3a, and the right half serves as an operation display section 3b. A 15-shaped opening/closing lid 7 is rotatably supported below the measuring part 3a, and an insertion part 8 for the test piece 2 is formed inside the measuring part 3a. The measuring part 3a is connected to the insertion part 8 of the test piece 2.
The receiver is configured to be removably installed on a stand (not shown).

The optical system 4 includes a light emitting diode 9 and a photodiode 10
It is configured in a transmitted light system. This light emitting diode 9 is attached to the opening/closing lid 7, and the first diode 1'10 is attached to the insertion portion 8.
Both diodes 9.1 are mounted opposite to each other on the floorboard of the
The test piece 2 is placed between 0 and 0.

The operation display section 3b includes a measurement display window 11 showing urine #N concentration, etc.
, an operation display window 12 that indicates whether the input light meter is too large or too small, a calibration switch 13, and a measurement switch 14 are provided, and a power switch 15 and an AC adapter jack 16 are provided on the side. Furthermore, a housing section 17 for a battery 18 serving as a power source is formed at the bottom of the operation display section 3b.

The display system 6 is composed of a 7-segment L-light emitting diode,
The user faces the measurement display window 11, which shows the urine sugar concentration in three digits.

The signal processing system 5 is composed of a microcomputer in which electronic components such as LSI are mounted on a printed circuit board inside the case 3. The CPU 19 of the signal processing system 5 receives an electric signal from the photodiode 10 via an r/V converter 20 and an A/D converter 21, and receives a switching signal (operation signal) from a calibration and measurement switch 13.14. ) is configured to be input. Also, CPUl
9 is a light emitting diode 9, a display system 6 and a reaction end buzzer 2
2, while power is supplied from the battery 18 via the power switch 15 and the power cutoff means 23,
The optical system 4, signal processing system 5, and display system 6 are activated.

The power cutoff means 23 includes a transistor 24 whose emitter is connected to the battery 18 and whose collector is connected to the CPU 19.
The base is grounded via a resistor 25 and a capacitor 26. Further, an operating signal is inputted from the CPU 9 to the base of the transistor 24 via a resistor 25, and a return switch 27 is provided in parallel with the capacitor 26.

1. This power cutoff means 23 is usually 1-ransistor 2.
When the I-ow signal is input from the CPU] 9 to the base of the CPU 4, the transistor 24 becomes conductive. T(i B
It is configured to output the h signal to cut off the transistor 24.

Further, a linear calibration curve is set in the CPU 9 that shows the relationship between the current value and the urine sugar concentration depending on the degree of coloration. Then, zero blank correction of the calibration curve is performed based on the degree of coloration of the unused test paper 2b, and the urine sugar concentration is detected based on the calibration curve from the degree of coloration of the test paper 2b soaked in urine. has been done.

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

First, an unused test piece 2 is inserted into the insertion section 8 and positioned between the light emitting diode 9 and the photodiode 10, and the opening/closing lid 7 is closed. Then, the power switch 15 is turned on. At this time, the transistor 24 has a CPU]
9, an ow signal is input, and this transistor 24 is turned on, and power is supplied from the battery 18 to the signal processing system 5, the optical system 4, and the display system 6.

Next, when the calibration switch 13 is pressed, the light emitting diode 9
emits light, and the light passes through the test paper 2b and the stick 2a and is received by the photodiode 10. Then, it is converted into an electrical signal corresponding to the amount of transmitted light and input to the CPU 19, zero blank correction of the calibration curve is performed, and the calibration curve is calibrated based on the color of the unused test strip 2b itself.

Thereafter, when the test piece 2 is taken out and soaked in urine, the test paper 2b causes a color reaction due to the urine sugar, and changes color depending on the urine sugar concentration. This test piece 2 is inserted into the insertion section 8 again, and the test paper 2b is positioned between the light emitting diode 9 and the photodiode 10.

Subsequently, when the measurement switch 14 is pressed, a countdown of 30 seconds is performed, and the time is sequentially displayed via the display system 6. Then, when the color reaction time reaches 0 seconds and the color reaction time ends, the buzzer 22 is driven and the light emitting diode 9 emits light. This light passes through the test strip 2b and the stick 2a and is received by the photodiode 10, as in the case of calibration, and is converted into an electrical signal corresponding to the amount of transmitted light and input to the CPU 19.

The urine sugar concentration is calculated from this input signal based on the calibration curve, and the measurement result is displayed from the display system 6 through the measurement display window 11 (for example, 32 cm/d).

This completes the measurement, but if the power switch 15 is turned on during the measurement and left without any operations, that is, the calibration switch 13 or the measurement switch 14 is left unpressed for a predetermined period of time (for example, 3 minutes). Then, a HI g h signal is input from the CPU 19 to the base of the transistor 24, turning off the transistor 24, cutting off the power supply, and preventing the battery 18 from being exhausted. When turning on the transistor 24, the return switch 27 is pressed to discharge the capacitor 26.

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

Moreover, the power cutoff means 23 is not limited to the embodiment, and may be any other switching circuit.

Furthermore, the optical system 4, signal processing system 5, and display system 6 are not limited to the embodiments, and the power source is not limited to the battery 18.

(f) Effects of the Invention As described above, according to the biochemical measuring device of the present invention, the power supply is cut off if the device is left without any operation for a predetermined period of time by providing a power cutoff means, and therefore the power supply is cut off when the power supply is turned off. If you forget to turn off the power, the power supply will automatically stop, ensuring that unnecessary power consumption is prevented.

In particular, when a battery is used as a power source, waste of the battery can be reliably prevented, resulting in energy savings.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a circuit block diagram of the main part of the urine sugar measuring device without showing power cutoff means, and FIG.
The figure is a circuit block diagram of the urine sugar measuring device, FIG. 3 is a perspective view thereof, and FIG. 4 is a plan view thereof. 1: Urine sugar measuring device, 2: Test piece, 3: Case, 4: Optical system, 5: Signal processing system, 6: Display system, 15: Power switch, 18
:Battery, 19: CPU, 23: Power cutoff means, 24: Transistor

Claims (1)

[Claims] (1) A test piece that causes a color reaction due to the substance to be detected, an optical system that optically detects the degree of coloration of this test piece, and a measurement value calculated from the signal of the optical system based on an operation signal. A signal processing system, a display system that displays the measured values of this signal processing system, a power supply that supplies power to these optical systems, signal processing system, and display system, and a state in which the operation signal is not input when power is supplied to this power supply. 1. A biochemical measuring device comprising: a power cutoff means that cuts off the power when left unused for a predetermined period of time.