JPS60187830A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To make it possible to know converging bodily temp. in an early stage and to grasp the accurate degree of estimation body temp. corresponding to the elapse of time, by displaying presently detected bodily temp. and the estimation bodily temp. containing an erroneous range by a display device for displaying bodily temp. analogously. CONSTITUTION:The output of a sensor 1 such as a thermistor for detecting bodily temp. is converted to a digital signal by an A/D converter 2. CPU3 receives the detection temp. signal from the A/D converter 2 and estimates converging temp. Ts at every predetermined temp. according to the program stored in a ROM4 and performs control for determining an erroneous range. A RAM5 stores various data in a control process. A bodily temp. display device 6 has traversly long segments S1-Sn arranged vartically therein and displays bodily temp. analogously. Presently detected bodily temp. and a converging value calculated at this time, that is, estimation bodily temp. are displayed by the display device 6 so as to include the erroneous range.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to an electronic thermometer, and particularly to an electronic thermometer that displays currently detected body temperature and predicted body temperature.

(b) Conventional technology and its problems Generally, when using an electronic thermometer, the detection part is inserted under the armpit or under the tongue, but it takes time for the detection part to reach a state of thermal equilibrium with the body temperature. Conventional electronic thermometers either digitally display the current detected temperature at each point in time from a changing state to a stable state, or display a predicted body temperature by predicting the convergence value of body temperature after a certain period of time after the start of measurement. That's what I do. However, if the state of change in body temperature is displayed digitally at each point in time, it is not possible to know the convergence temperature value early, and if only the predicted body temperature is displayed, even if it is possible to know the temperature at an early stage, The drawback was that the measurer could not know how accurate the predicted body temperature was.

(c) Purpose of the Invention The purpose of the present invention is to solve the above-mentioned drawbacks of the conventional electronic thermometer, and to provide an electronic thermometer that can quickly determine the convergent body temperature and ascertain the accuracy of the predicted body temperature over time. is to provide.

(d) Structure and effect of the invention In order to achieve the above object, the electronic thermometer of this invention has the following features:
It is equipped with a display that can display body temperature in an analog manner, and the display displays the currently detected body temperature and the predicted body temperature including the error range.

According to the electronic thermometer of the present invention, the currently detected body temperature and the predicted body temperature are displayed simultaneously on the display, and the predicted body temperature is displayed including the error range, so the measurer can immediately know the accuracy of the predicted body temperature. can.

Furthermore, since the ranges of the currently detected body temperature and predicted body temperature are displayed in an analog manner, the predicted body temperature and its accuracy can be immediately and intuitively known.

(e) Description of Examples The present invention will be explained in more detail below with reference to Examples.

FIG. 1 is a block diagram of an electronic body temperature needle in which the present invention is implemented. In the figure, 1 is a sensor such as a thermistor for detecting body temperature, 2 is an A/D converter that converts the output from sensor 1 from an analog signal to a digital signal, and 3 is a CPU that converts A/D. Upon receiving the detected temperature signal from the device 2, the convergence temperature Ts is predicted at predetermined intervals according to a program stored in the ROM 4, and control is performed to determine the error range. 5 is a RAM that stores various data during the control process. 6 is a body temperature display, in which horizontally long segments S1, S2, . . . , Sn are arranged vertically to display body temperature in an analog manner. The display 6 displays the currently detected body temperature and the convergence value calculated at that point, that is, the predicted body temperature, including the error range. Although a liquid crystal display is used as a display element of the display 6, an LED, ECDXCRT, etc. may be used instead. 7 is the display data from CPU3 in segment S
1, S2 . . . A decoder driver for decoding for Sn and driving the display device 6. 8 is a start switch for instructing the start of measurement.

Note that, as shown in FIG. 3, the RAM 5 stores information that focuses on the fact that the error in predicted body temperature decreases with elapsed time.
An error table, that is, a prediction error range reaching the elapsed time from the start of the measurement is stored in correspondence. The figure shows, for example, an error of ±0.5°C after 20 seconds or more, ±0.4°C until 40 seconds or more elapsed, and ±0.0°C after 10 minutes or more.
This indicates an error of 1'C, and the error values for each of these elapsed times are determined experimentally and stored in advance. However, the prediction error range may be calculated and temporarily stored each time a prediction is made.

Next, the operation of the electronic thermometer of the above embodiment will be explained with reference to the flowchart shown in FIG.

When the start switch 7 and 8 are turned on and the operation begins,
First, a timer is started in step STI.

This timer is used to check the elapsed time after the start of measurement, and is built into the CPU 3, although it is not particularly shown. Subsequently, in step ST2, the current sensor output is read, the current body temperature is detected, and the predicted body iTs is calculated.

The detailed processing in step ST2 will be described later.

Next, read the timer and obtain the time of predicted body temperature calculation (
Sr1) From this time, refer to the table shown in FIG. 3 and read out the error ΔT at that time from the RAM 5T4), calculate the predicted body temperature range Ts-ΔT including the error ±8T.
= T s + ΔT is obtained (Sr5). Then, the currently detected body temperature and predicted body temperature range Ts-ΔT-Ts+8 are displayed on the display 6 (Sr5). Then, it is determined whether or not the measurement has ended (5T7), and if the start switch 8 is not turned off, the determination is NO and the process returns to step ST2, and the processes of step ST2...step ST6 are repeated as time elapses, continuously. The current body temperature is detected, the predicted body temperature is calculated, and an error corresponding to the calculation time is extracted, the predicted body temperature range is calculated each time, and the current body temperature and the predicted body temperature range are displayed on the display 6.

For example, if the predicted body temperature after 3 minutes is 37.3 degrees, the error range after 3 minutes is ±0.2 degrees, so the predicted body temperature range is 37.1 to 37.5 degrees.

Assuming that the current body temperature at this point is 36.8', the current body temperature and predicted body temperature range are displayed as shown in FIG. In other words, the current body temperature is 36.8° from the left end of the display 6.
The display segments up to 37.1° to 37.5° are displayed as dots, and the predicted body temperature range is displayed as display segments in the range of 37.1° to 37.5° are illuminated. This predicted body temperature range is 37.1-37
．． The 5° display is blinking and is distinguished from the current body temperature display.

The measurer sees these displays and learns that the predicted body temperature is 37°3°, with an error of ±0.2°, and that the current body temperature has reached 36.8°. Therefore, when a rough measurement is sufficient, the user can intuitively know that the body temperature is approximately 37.3°.

If the measurer wishes to perform a more accurate measurement, the display width of the predicted body temperature range becomes smaller and the measurement is continued until the range falls within the allowable error range.

Next, a specific example of the method of detecting the current body temperature and calculating the predictor @ Ta in step ST2 shown in FIG. 4 will be described with reference to the flowchart shown in FIG. 5. In addition, in the calculation method of the predicted body temperature Ts shown here, there is a linear relationship between the logarithm TL of the time differential of the body temperature T to be measured and the time t, and TL=
Focusing on the fact that it can be expressed as A−τ”t, we use the regression method to calculate the constant A
and τ゛, and the convergent body temperature Ts is predicted from these constants.The inventors of this application have created and have already filed an application for an electronic body temperature needle that adopts this principle.

When entering the current body temperature detection and predicted body temperature Ts calculation routine, first the initial temperature value To is stored in step 5T21, then it is determined in step 5T22 whether or not the sample time has arrived, and when the sample time has arrived, the A/ The time t1 taken in through the D converter 2 is stored in the RAM 5 (ST26).

Next, it is determined whether the sample time number i has reached the preset n (5T27), and if it has not reached the preset value n, then
Return to step 5T22, and thereafter step 5T every time a sample time arrives until the number of samples i reaches n.
22. Repeat the process of 5T23...5T26. Through this series of processing, each sample time t1, t2...t
n and logarithmic values TLI, TL2, . . . TLn of the time differential value of the detected temperature for each sample time are stored in the RAM 5.

When the number of sample times i reaches n, Stellaf 5T2
7 becomes YES, and then the stored data t
1, t2...Ln and TLI, TL2...TLn, the constants A and τ'' are calculated by the regression method, that is, by the following equation (ST28.5T29).

nΣLi2− (Σti) 2 (ST30).

Among the data obtained as described above, the detected temperature Ti (current body temperature) of i-n and the predictor aTS are used for display in step ST6 of FIG. 4.

Note that in the above embodiment, the predicted body temperature is calculated by a regression method, but it may be calculated by other prediction methods.

Furthermore, in the above embodiments, the display device uses a display in which horizontally long segments are arranged vertically in a straight line, but the shape of the arrangement is not limited to a straight line, and may be circular or semicircular. They may be arranged in a shape, an arc shape, or the like.

In addition, in the above embodiment, the current body temperature is displayed by lighting up all the display segments from the left end segment of the display to the current body temperature, but it is also possible to light up only the display segment corresponding to the current body temperature. good.

[Brief explanation of drawings]

Figure 1 is a block diagram of an electronic thermometer in which the present invention is implemented, Figure 2 is a diagram showing a display example of the electronic thermometer, Figure 3 is a diagram showing an error table of the electronic thermometer, and Figure 4 is a diagram of the electronic thermometer. FIG. 5 is a main flow diagram for explaining the operation of the thermometer, and FIG. 5 is a flow diagram showing a predicted body temperature calculation routine. 1: Sensor, 2: A/D converter, 3: CPU, 4
:ROM, 5:RAM. 6: Display, 7: Decoder dryer, 8 Ni start switch. Figure 2 30, 0 35. υ 37. Oj5υ 4], ○yto5
T21 ) ST23 ) ST24 'TJJ-5T25 ) ST26 5T27 ) ST28 -ST29

Claims (1)

[Claims] (1) An electronic thermometer that predicts and displays the convergence value of body temperature is equipped with a display that can display body temperature in an analog manner, and this display displays the currently detected body temperature and the predicted body temperature including the error range. An electronic thermometer that is characterized by: