JPS62185132A - Electronic thermometer - Google Patents

Abstract

PURPOSE:To obtain a highly accurate thermometer, by displaying an estimated value when a difference between the estimated value and an actually measured value reaches a specified value in comparison therewith. CONSTITUTION:With a power source switch 7 ON, a CPU3 actuates a temperature sensor 1 to memorize temperature information being fed constantly through an A/D converter 2 into a memory 4. The CPU3 is provided with a parameter P decision means which determines whether a parameter P for computing an estimated value is the normal temperature rising rate at the measurement of body heat as preset or not, an estimated value computation means for computing a convergent temperature by a fixed formula based on the parameter P and a display switching means. After the start of the temperature inspection, an actually measured temperature is displayed 5 while the parameter P is determined. Then, a difference between a estimated value calculated and the actually measured temperature reaches a preset specified value (e.g. 0.5 deg.C) in comparison therewith, the display of the actually measured value is switched over to that of the estimated value. Thus, the displayed estimated value gives a stable and reliable convergent value.

Description

[Detailed description of the invention] (a) Industrial application field The present invention is an estimating type electronic thermometer, which compares an estimated body temperature value and an actual measured temperature, and the difference between the two is within a predetermined value. This invention relates to an electronic thermometer that displays an estimated value for the first time.

(b) Conventional technology Estimation-type electronic thermometers usually measure temperature for a certain period of time, calculate a convergence temperature, that is, an estimated body temperature value based on changes in multiple temperature data obtained, and update this estimated value sequentially. displayed to shorten measurement time.

Conventionally, two methods have been adopted for displaying this estimated body temperature value.

One (former) display method starts temperature measurement, collects multiple temperature data for estimation, calculates the parameter P based on this temperature data, and immediately displays the estimated value when the estimation calculation is performed. It is a method of

The other (latter) display method is for a certain period of time (
This method operates a timer (for example, 40 seconds) and displays the estimated value obtained during this time at the same time as the timer ends.

(C) Problems to be Solved by the Invention In the former of the above display methods, temperature data for several points for estimation are obtained within a short period of time after the start of temperature measurement. Therefore, there is a large difference between the estimated value and the actually measured temperature, and the estimated value displayed at this point is unstable and has low reliability.

On the other hand, in the latter case, when a certain period of time has elapsed after starting temperature measurement, an estimated value is displayed regardless of the actual measured temperature. For this reason, although a highly accurate estimated value can be obtained by setting a long certain period of time, it is not possible to shorten the measurement time. In addition, even if the convergence temperature is the same, the response curve (upper bound curve of the detection temperature)
varies depending on the measurer. Therefore, the estimated value display method based on a uniform regulation of a certain period of time has disadvantages such as not being able to accommodate the various measurement users and resulting in cases where the accuracy of the estimated value is extremely poor.

An object of the present invention is to provide a highly accurate electronic thermometer that compares the difference between an estimated value and an actually measured value and displays the estimated value when the difference reaches a predetermined value.

(d) Means and operation for solving the problem In order to achieve this object, the electronic thermometer of the present invention has the following configuration.

The electronic thermometer includes a temperature measuring means for measuring temperature, a temperature display means for displaying the actual measured value obtained by the temperature measuring means, and a body temperature based on a plurality of pieces of temperature information measured by the temperature measuring means. An estimated value calculating means for calculating a 1-star value compares the estimated value obtained by this estimated value calculating means with the actual 41+1 value obtained by the temperature measuring means, and calculates the difference value between the estimated value and the actual measured value. and display switching means for switching the actual measured value display to the estimated value display when the value is within a predetermined value.

In an electronic thermometer with such a configuration, after starting temperature measurement,
The actually measured temperature is displayed while determining the parameter P for calculating the estimated value. The difference value between the calculated estimated value and the actually measured temperature that increases sequentially is compared, and the actual measured value continues to be displayed until the difference value falls within a predetermined value. The difference value is a predetermined value (
For example, when the temperature reaches 0.5°C, the actual value display is switched to the estimated value display for the first time.

Therefore, when the difference value between the estimated value and the measured value reaches a predetermined value, this estimated value is recognized as a nearly constant and highly accurate estimated value, and even if there are individual differences in the response curve of the measurer, A highly accurate estimated value will always be displayed.

(e) Embodiment FIG. 3 is a block diagram showing an example of the circuit configuration of an electronic thermometer according to the present invention.

The temperature sensor 1 is a temperature sensing element such as a thermistor, and detects the temperature of the sublingual or armpit area that it comes into contact with, and outputs an electrical signal corresponding to the temperature. Then, temperature information detected at any time (
Analog N) is converted to CPtJ (
The central processing unit) 3 converts it into a digital value that is easy to process, and takes it into the CPU 3.

The CPU 3 operates the temperature sensor 1 by turning on the power switch 7, and stores the temperature information sent from time to time in the memory 4.

Furthermore, this CPU 3 has a temperature increase curve (response curve) for calculating the estimated value, that is, a parameter P determination for determining whether or not the parameter P is a normal temperature increase rate at the time of body temperature measurement set in advance. and an estimated value calculation means that calculates a convergence temperature (estimated value) using a certain formula based on this parameter P, compares the measured temperature and the estimated value, and calculates the difference value to a preset value (0, Display switching means is configured to determine whether or not the value is within 5'C) and to switch to displaying the estimated value only when the value is within 5'C).

The parameter P determining means calculates the parameter P by analyzing a response curve of the detected temperature change. This parameter P
is calculated as the ratio of the rate of change when a response curve (detected temperature change curve) is drawn.

Then, this parameter P is within a preset range (0
, 38 to 0.68), it is determined whether the temperature change with respect to time is the one at the time of body temperature measurement.

The set value (reference range) for this comparison is determined to be between 0.38 and 0.68 based on clinical results.

If the obtained parameter P is within the set value, the estimated value is calculated as a body temperature measurement, and if it is outside the range of the set value, the estimated value is calculated as a measurement other than body temperature measurement (for example, hot water measurement). Not performed.

The parameter P is calculated based on the following formula.

Tz　　T+ T, -T'.

1, -10 In this equation, T is the detected temperature and t is the time.

However, the parameter P is not limited to the above, and for example, a value calculated as a ratio of change rates, a ratio of change rate ratios, etc. may be used.

The estimated value calculating means estimates the convergence temperature only when the parameter P determining means determines that body temperature is being measured, and estimates the convergence temperature based on the rate of change of the detected temperature, the slope of the response curve, etc. The estimated value 5(t) is calculated based on the following formula.

5(t) −T(t)+ (a (t+ b)2+
c) dT/dt In this estimation formula, T(t) is the detected temperature at the sampling timing one hour after the start of measurement, and this detected temperature T(t), the measurement time t, and the detected temperature at this sampling timing are rate of increase d
T/dt is the calculation element.

In addition, a (-0,002), b (-200), c (
30) are multipliers each having a constant value.

Further, the CPU 3 is connected to a buzzer 6 that notifies that the estimated value has become approximately constant, a power source 8, and a power switch 7.

FIG. 1 is a flowchart showing specific processing operations of the electronic thermometer according to the embodiment.

When the power switch is turned on, the instrument is initialized (
(hereinafter referred to as '5TIJ), it is determined at Sr1 whether or not it is the sampling time.

At the sampling time, the temperature T detected by the temperature sensor 1 is read into the CPU 3 (Sr1) and stored in the memory 4 (Sr4), while the following operations are performed every sampling time and the process returns to Sr1. This sampling time is performed every second in the embodiment.

In the next Sr1, it is determined whether the guessing means is capable of guessing. In this determination, for example, it is determined that estimation is possible after 40 seconds have passed from the start of measurement. In other words, temperature data that can be estimated (to=20 seconds, t+
= 30 seconds, t: + = Detected temperature T0 at 40 seconds, T
I, TZ') are obtained. If this estimation is impossible, the process moves to Sr1 and it is determined whether the parameter P for determining whether or not body temperature is to be measured can be calculated. For example, if 40 seconds or less have elapsed since the start of measurement, calculation is not possible, that is, if the number of detected temperatures T is not sufficient to calculate the parameter P, the process moves to Sr7 and the current detected temperature is 32°C.
It is determined whether or not it is higher than that.

Now, if the measured temperature is higher than 32°C, this measured temperature T will be displayed on the display as shown in Figure 2 (STI
I). On the other hand, if the temperature is lower than 32°C, display 'LJ' on the display (Sr1), then judge whether the measurement has ended (whether the power switch is OFF or not) (5T9), and hold S until the end.
Return to r1.

The operations Sr1 to Sr9 are performed for 40 seconds after the start of measurement, and after 40 seconds, the parameter P can be calculated, and the determination of Sr1 becomes "YES".

Here, the CPU 3 analyzes the response curve and calculates the parameter P (STIO). That is, the response curve of the detected temperature T with respect to time t is analyzed, and the parameter P is calculated using the old formula. That is, each detected temperature T is set at an interval of 10 seconds to=20 seconds, tl=30 seconds, and t2=40 seconds. ,T,
, T2, and display the measured temperature on the display (STII).
Return to r1.

Assuming that the next sampling time has come and 40 seconds have passed since the start of measurement, that is, when the parameter P is obtained, estimation becomes possible. Here, the determination of Sr1 is YES'', and in 5T12, it is determined whether the parameter P is within a predetermined range. In other words, it is determined whether the parameter P is within the range of the clinical result data. P>0.68
means a rapid temperature rise other than body temperature measurement, and
Conversely, when P<0.38, it means that the temperature rises slowly.

In either case, it is an inappropriate measurement other than body temperature measurement or the change is outside the range.

Therefore, if the parameter P is outside such a predetermined range, the determination at 5T12 becomes "No" and ST, 1
1, the detected temperature T is displayed as it is, and the convergence temperature is not estimated.

On the other hand, if parameter P is within the set value range, S
The determination at T'12 is "YES", and it is determined that the predetermined body temperature measurement has been performed, and at 5T13, the estimated value 5(t) is calculated. After that, the difference value between this estimated value and the actual measured temperature is calculated (ST14
), and in the next 5T15, it is determined whether the difference value is within a predetermined value, that is, 0.5°C.

If the difference value is 0.5℃ or more, this estimated value is recognized as unstable (rough value), and the estimated value is not displayed at this point.
The actual measured value is displayed on the display (STII).

Now, if the actual measured temperature rises and the difference value from the estimated value becomes 0.5°C, the judgment of this 5T15 becomes ``YES,'' and for the first time, the estimated value is displayed on the display (ST16).Then, the buzzer 6 notifies that this estimated value is highly accurate and reliable, and the measurement is completed by turning off the power switch (ST9).

(f) Effects of the Invention In this invention, as described above, the estimated value and the actually measured temperature are compared, and when the difference between the two is within a predetermined value, the estimated value is displayed on the display. And so.

According to this invention, the estimated value and the actually measured temperature are constantly compared, and the estimated value is not displayed until the difference between the two is within a predetermined value. Therefore, the displayed estimated value is a substantially constant, stable and reliable body temperature equilibrium (convergence) value, and the measurer can perform the measurement work with peace of mind without having doubts or misunderstandings about the displayed estimated value.

In addition, in this invention, the estimated value is displayed only when the difference value is within a certain value, so it is not possible to always display the estimated value with an accuracy higher than a certain value, and This invention has an excellent effect of achieving the purpose of the invention, such as being able to display only estimated values within the specified difference value.

[Brief explanation of drawings]

FIG. 1 is a flowchart showing the processing operation of the electronic thermometer according to the present invention, FIG. 2 is an explanatory diagram explaining the temperature display method of the embodiment thermometer, and FIG. 3 is a block diagram showing an example of the circuit configuration. . 1: Temperature sensor, 3: CPU. 4: Memory, 5: Display. Patent applicant Tateishi Electric Co., Ltd. (Baka 1
Name) Agent Patent Attorney Shigeru Nakamura Figure 3

Claims (1)

[Claims] (1) A temperature measuring means for measuring temperature, a temperature display means for displaying the actual value obtained by the temperature measuring means, and calculating an estimated body temperature value based on a plurality of pieces of temperature information measured by the temperature measuring means. An estimated value calculating means compares the estimated value obtained by the estimated value calculating means with the actual measured value obtained by the temperature measuring means, and when the difference between the estimated value and the actual measured value is within a predetermined value, An electronic thermometer comprising a display switching means for switching an actual value display to an estimated value display.