JPS62265539A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To display an estimated value smoothly and to improve the reliability of the estimated value by interrupting estimation arithmetic temporarily and holding the estimated value just before the interruption if measured temperature drops in the middle of temperature examination. CONSTITUTION:A CPU 3 operates a temperature sensor 11 to store the successively sent temperature information in a memory 4 when a power switch 13 is turned on and also displays it on a display device 12. Further, the CPU 3 is equipped with a parameter deciding function and an estimated value arithmetic function. Further, the CPU 3 includes an estimated value arithmetic stopping function which stops the estimation arithmetic when the temperature rise state of a measured value detected by a temperature measuring function decreases below the specific value, and an estimation arithmetic restarting function which restarts the estimated value arithmetic function when the measured value recovers the peak value right before the stop and specified conditions are satisfied after the estimation arithmetic is stopped by the estimation arithmetic stopping function.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention is an inference-type electronic thermometer that performs calculations when the measured temperature temporarily drops during body temperature measurement and then rises again. The present invention relates to an electronic thermometer that temporarily stops and restarts estimated value calculation under predetermined conditions.

(b) Conventional technology Estimation-type electronic thermometers usually calculate a parameter (P) from a plurality of detected temperature information after actually measuring the temperature for a certain period of time, and apply this parameter (CP) to a predetermined estimation calculation formula. It calculates an estimated value and displays this estimated value on a display.

In general, the measurement termination method of this estimating type electronic thermometer is based on the fact that a certain period of time has elapsed from the start of measurement to ensure the reliability of the inferred value, and the slow speed at which the equilibrium salt is reached to ensure the rationality of the measurement. Therefore, it is decided to end the measurement when three conditions are met: the temperature change is below a certain value, and the temperature sensor is removed from the detection part and the detected temperature has decreased by more than a predetermined value. (Unexamined Japanese Patent Publication No. 59-11
Publication No. 4426 Ig) 0 (c) Problems to be Solved by the Invention The above-mentioned inference type electronic thermometer is configured to determine the end of body temperature measurement only when the above three conditions are satisfied.

Therefore, even if the person taking the temperature sensor removes the temperature sensor from the detection site during body temperature measurement, the estimation calculation will be executed.

The estimated value 5(t) is usually calculated based on the following equation.

5(t) = T(t) + (a (t+ b)”
c) dT/dtIn this estimation formula, T(t) is the measured temperature at the sampling timing when t hours have passed since the start of measurement, and the measured temperature T(t)-, the measurement time t, and the measurement at this sampling timing. The temperature increase rate dT/dt is a calculation element. Also, a (
-0,002), b (-200), c (30
) are each constant multipliers.

Therefore, even when the actually measured temperature decreases, when calculating the estimated value, the estimated value naturally decreases in accordance with the decrease in the actually measured temperature. In this case, as a result of the measurer removing the temperature sensor from the detection area to finish the measurement,
There is no problem if the actual measured temperature (and estimated value) has decreased.

However, if the temperature sensor is temporarily removed from the detection area during the actual measurement and then starts measurement again later, the estimated value displayed at this point will have already decreased considerably. Then, when the measured temperature rises again, the estimated value rises rapidly due to the large temperature change during recovery, and the measurer becomes uncomfortable with the drastic change in the displayed estimated value, and as a result, becomes uneasy about the estimation, and as a result, becomes unreliable. There were disadvantages such as low gender.

This invention solves the above-mentioned problems with conventional devices. When the measured temperature temporarily drops during measurement, the inference calculation is temporarily held at that point, and the inference calculation is resumed when the measured temperature rises again. It is an object of the present invention to provide an electronic thermometer that displays a smooth increase in the estimated value and improves the reliability of the estimated value by restarting calculation.

(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.

An electronic thermometer includes a temperature measuring means for measuring temperature at a predetermined cycle, a memory for storing the actual value detected by the temperature measuring means, and a temperature measuring means for measuring the temperature at a predetermined cycle based on the plurality of actual values measured by the temperature measuring means. an estimated value calculation means for calculating an estimated body temperature value; and an estimation calculation stop for temporarily stopping the calculation of the estimated value and holding the estimated value when the rate of change of the actual value measured by the temperature measuring means reaches a predetermined value. and a guess calculation restarting means for restarting the calculation of the guess value calculation means when the actual measured value satisfies a predetermined condition after the guess calculation has been stopped by the guess calculation stopping means.

In the electronic thermometer having such a configuration, an estimated value is calculated based on a plurality of pieces of actually measured temperature data, and the estimated value of body temperature convergence is sequentially displayed on the display in response to increasing actually measured temperature.

Now, if the measurer removes the temperature sensor from his armpit during measurement and finishes the measurement, the actual measured temperature will drop rapidly. The guess calculation stops when the rate of change of the measured temperature reaches a predetermined value (a positive value immediately before reaching 0), and the display state of the guess value at this point is maintained.

Here, the actually measured temperature that is decreasing is constantly compared with the peak value recorded and updated in the memory immediately before the decrease. Furthermore, when the actually measured temperature continues to decrease and the decrease value reaches a predetermined value or more, it is determined that the measurement has ended, and the estimation calculation is terminated.

From then on, it functions as a normal peak-hold thermometer.

On the other hand, once the estimation calculation is temporarily stopped, the measured temperature rises again, and a certain period of time has passed since this measured value reached a certain condition, for example, the previous peak value, and the rising temperature becomes stable. At the point in time, the guess calculation is restarted, and this guess value is displayed on the display following the held guess value.

Thereby, the estimated value can be displayed smoothly without following the decrease in the actually measured temperature, and the reliability of the estimation can be ensured.

(E) Embodiment FIG. 2 is a front view showing a specific embodiment of the electronic thermometer according to the present invention.

The electronic thermometer has a temperature sensor 11 such as a mister protruding from the tapered tip of the body case 1, and a display 12 in the center of the body case 1 that displays the temperature measurement results (actual and estimated values). A one-touch power switch 13 for starting and ending the measurement, and a buzzer 14 for notifying the end of the measurement are also provided.

FIG. 3 is a block diagram showing a specific example of the circuit configuration of this electronic thermometer.

The temperature sensor 11 detects the temperature of the sublingual or armpit area that it contacts, and extracts an electrical signal according to the temperature.

The temperature information (analog amount) detected at any time is A
/D converter 2 converts it into a digital value that can be easily processed by CPU (central processing unit) 3,
It is taken into CPU3. - When the power switch 13 is turned on, the CPU 3 activates the temperature sensor 11, stores the temperature information sent from time to time in the memory 4, and displays it on the display 12. The CPU 3 also contains information on whether the temperature rise curve (response curve) used to calculate the estimated value based on this temperature information, that is, the parameter (P), is the normal temperature rise rate at the time of body temperature measurement set in advance. A parameter (P) determination function that determines whether this parameter (P)
Based on a certain mathematical formula, for example, where T is the measured temperature, h(t) is a parameter, and dT/dt is the rate of temperature rise - this mathematical formula is used to calculate the convergence temperature (estimated value). It has functions.

Furthermore, the CPU 3 has a guess calculation stop function that stops the guess calculation when the temperature increase state of the actual measured value detected by the temperature measurement function becomes less than a predetermined value, and a It includes a guess calculation restart function that restarts the guess value calculation function when the actual measured value is restored to the peak value immediately before the stop and a certain condition (for example, a certain time) is satisfied.

In addition, this electronic thermometer is equipped with a power battery 5 and a power switch 13. However, the hardware configuration shown in FIG. 3 is the same as that of a conventionally well-known general electronic thermometer.

The electronic thermometer of this embodiment is characterized by the functional configuration possessed by the CPU 3.

Therefore, the software configuration and operation of the electronic thermometer of this embodiment will be explained next with reference to the flow shown in FIG.

When the power switch 13 is turned on, the meter is initialized, and the wait time, hold flag, and end flag are each initialized to the O state [step (hereinafter referred to as rSTJ) 1].

Here, the wait time is a timer that measures the time when the measured temperature that rose during the temperature measurement once drops and returns to the original measured temperature (peak value), and waits until the measured temperature reaches a stable state. The purpose is to wait and restart guess calculation.

Further, the hold flag is a flag for temporarily stopping the estimation calculation function and holding the estimation value at the time of stopping when the rate of change of the actual measured temperature that has increased during temperature measurement becomes less than a predetermined value.

Furthermore, the end flag means that after the estimation calculation function is temporarily stopped, when the measured temperature still falls and the difference value between the peak value at the time of stopping and the actual measurement value becomes less than a predetermined value, the estimation calculation function is completely stopped. Flag used to terminate.

After the power switch 13 is turned on, in the next step Sr1, it is determined whether it is sampling time or not.

In the embodiment, the actual temperature is measured every second. Therefore, at each sampling time, the sensor 11 sends current temperature information to the CPU 3 (Sr1), and the actual measured value that increases sequentially is
It is stored in memory 4 (Sr4).

In the embodiment, the past four measured values (To, To, T, , T□), which are shifted at each sampling time, are always stored and held.

Then, in Sr1, it is determined whether the current measured value Tt is higher than T3 stored in the memory 4 (Sr1),
If it is high, T3 is set as T2, and the current measured value Tt is stored as T3 (Sr1).

In other words, peak hold of the actual measured value is performed.

When Vt<ST7 in Sr1, it is determined whether the hold flag is O or not, but since the hold flag is initially 0, the program then skips to 5TIO and it is determined whether the end flag is O or not. This determination is also initially 0, so next the process moves to 5T13, where (T 3 - To) / 3 is calculated, the temperature increase rate dT/dt is determined, and this temperature increase rate dT/dt is determined as β [Example: 0 .025/6 ('C/5
It is determined whether or not the value is greater than or equal to ec) ) (ST14). If the temperature is being measured normally, the measured temperature will rise exponentially after the start of the measurement, so initially dT/dt
is larger than β, this judgment becomes YES, then 5T
18, it is determined whether the wait time is 0 or not.

Since the wait time is still set to O in STI,
This determination is also YES, and then a predetermined estimate value calculation is performed (ST19), and the estimate value is displayed on the display 12 (ST21). Such a series of measurement operations is sequentially repeated at every sampling time.

In this way, if the measured temperature rises smoothly and does not exhibit a falling state during the measurement, the body temperature is determined to be in a state of body temperature equilibrium, as in the conventional example, and the measurement ends.

Next, a case will be described in which the person taking the temperature measurement ends the measurement in the middle of the measurement. In other words, the temperature sensor 11
A case will be explained with reference to FIG. 4, in which the actual measured value begins to decrease because the measured value is moved away from the measurement site, and the actual value decreases by more than a predetermined value from the peak value.

In this case, since the current temperature Tt decreases with the passage of time, dT/di calculated at 5T13 becomes smaller than β, so the determination at 5T14 becomes No, and the process moves to 5T15. Then, cent the hold flag from 0 to 1 (
ST15).

In the next (7) ST16, whether T3-Tt is larger than a predetermined constant T, that is, the actual measured temperature is constantly compared with the stored value (peak value) just before the temperature starts to decrease, and the difference value is the predetermined value. It is determined whether or not it is higher than that.

In the example, this constant γ is set to 0.3°C.

If T3-Tt is less than 0.3° C. immediately after the start of descent, the process returns to ST2 and temperature measurement continues with the estimation calculation stopped. On the other hand, if the measured temperature drops until the difference value becomes 0.3℃ or more, the judgment of 5T16 is "YES",
In other words, it is recognized that the measurer has moved the temperature sensor 11 away from the measurement site with the intention of completely ending the measurement, and the end flag is set from 0 to 1 (ST17). That is, the guess calculation function is brought to an end state. Thereafter, the normal peak-hold display state continues. In other words, since the end flag is 1 after the next sampling time, 5TI
Proceed from O to 5TII. Here, the actual measured value (displayed value) is T
Since it is smaller than 3, the determination of 5TII becomes "NO", and the actual measured value T3 remains displayed on the display 12 (ST12
>. Then, the measurement ends when the power switch 13 is turned off.

Next, the measurer moves the temperature sensor 11 away from the measurement site for some reason during the actual measurement, and then moves the temperature sensor 11 again.
The following explanation will be given with reference to FIG. 5, assuming that the actual temperature value drops during the temperature measurement and then rises again after the temperature measurement has been properly attached to the measurement site.

In this case, the current temperature Tt initially becomes equal to the previous stored value T3, but thereafter becomes lower than T3, the determination in ST5 becomes "No", and the process proceeds to 5TIO.

The end flag is now 0, that is, the guess calculation function is in an active state, and the guess calculation is being executed. Therefore, 5T13
Then, dT/dt, that is, the rate of temperature rise, is calculated.

Now, the temperature increase rate at present is almost close to O, and the predetermined value (
If it is smaller than 0,0025/6 ("C/5ec)", the judgment of 5T14 will be "No", the hold flag 0 will be set to 1 (5T15), and the guess calculation function will be temporarily stopped.Here , while maintaining the current estimated value displayed on the display 12,
Measurement of the actually measured temperature that falls is continued, and this measured temperature is compared with the stored value (peak value) immediately before the temperature starts to fall.

Now, the difference value between the measured temperature Tt and the peak value T3 is 0.2
℃, the difference is smaller than the constant γ0.3℃. Therefore, the determination at 5T16 becomes "NOo," and the process returns to ST2 to repeat the measurement of the actual temperature.

Then, the actual measured temperature rises from the time when the measurer reinstalls the temperature sensor 11, and this measured temperature Tt is restored to the peak value T. At this time, the judgment of ST5 is “YES”
This actually measured temperature is stored in the memory 4 as T3 (Sr6).

Since the hold flag is now 1 and the guess calculation is in a suspended state, the process proceeds to Sr1 via Sr7, and the wait time constant α is sent. In the example, the constant α is 1
It is set to 0 seconds. Then, after setting the hold flag to O (5T9) and making the guess calculation possible, 5T
Proceeding to 5T13 via IO, the temperature rise rate is calculated. Here, the current rate of change is, for example, 0.5°C/se.
c, it is higher than the constant β of the temperature increase rate and 5T
The determination in step 14 becomes "YES" and the process moves to 5T1B.

At 5TlB, it is determined whether the wait time is currently in the O state, that is, whether the 10 seconds set at Sr1 have elapsed. This 10 second period is the point in time when the temperature, which has once dropped, returns to the peak value T, which was just before the drop, and from that point on, the temperature rises further and reaches the extension curve of the peak value T (see Figure 5). ), that is, the upper limit temperature (estimated value) is set as a waiting time to wait until the upper limit temperature (estimated value) becomes stable.

The actual measured value has now been restored to its peak value, and 10 is set in Sr1. Therefore, proceed from 5T18 to 5T20, and in 5T20, time is measured at each sampling time,
Ten temperature measurements are performed repeatedly. Assuming that 10 seconds have passed now, the determination at 5T18 becomes "YES", the guess calculation is restarted (ST19), and the calculated guess value replaces the guess value that was held when the guess calculation was paused. is displayed on the display 12 (ST21). Thus, the estimated value is independent of fluctuations in the rise and fall of the measured temperature.
Smooth upward trend and ensure reliability of estimated values.

(F) Effects of the Invention As described above, in this invention, if the temperature sensor is removed from the measurement site during the actual measurement and the temperature change in the actual measurement temperature decreases to a predetermined value or more, the estimation calculation is temporarily stopped. The display state of the estimated value immediately before the stop is maintained, and when the actual measured value drops by a predetermined value or more, the estimated calculation function is terminated.On the other hand, when the temperature that has fallen rises again and returns to the peak value at the time of stopping We decided to restart the guess calculation under predetermined conditions.

According to this invention, when the measured temperature drops during temperature measurement, the estimation calculation is temporarily stopped, and the estimation value immediately before the cancellation is held. Therefore, the estimation calculation corresponding to the temperature drop is not performed, and the estimation value just before the end of the measurement is incomprehensible as in the conventional case.
Concerns about estimated values due to showing low values are eliminated.

In addition, in this invention, after stopping the estimation calculation, the transition of the measured temperature is constantly checked, and if the measured value rises again and recovers to the temperature at the time of stopping, wait for the measured temperature to stabilize. Resume guess calculation. Therefore, the estimated value does not follow the actual temperature that drops and rises during the actual measurement, and it becomes possible to display the transition of the estimated value in an extremely smooth state, and the reliability of the estimated value can be ensured. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a flowchart 1 showing the processing operation of the electronic thermometer according to the embodiment, FIG. 2 is a front view of the electronic thermometer, and FIG.
A block diagram showing an example of the circuit configuration of an electronic thermometer. Figures 1 and 2 are explanatory diagrams showing a state in which the sensor is removed from the measurement site during the measurement and the measurement is completed. Figure 5 is an explanatory diagram showing the state where the measurement is completed. FIG. 4 is an explanatory diagram showing a state in which estimation calculation is restarted when the amount of the amount increases again. 3: CPU, 4: Memory, 12 displays, 14: Power switch. Patent applicant Tateishi Electric Co., Ltd. (and 1 others)
Name) Agent Patent Attorney Shigeru Nakamura Nobunu 2nd O 3 Zutomi 4F! ! No. 5-L (Sf'CI procedure?, ili official text (Jiurō September 3, 1986)

Claims (1)

[Claims] (1) A temperature measuring means for measuring temperature at a predetermined period; a memory for storing the actual value detected by the temperature measuring means; an estimated value calculating means for calculating an estimated value, and temporarily stopping the calculation of the estimated value when a rate of change of the actual value measured by the temperature measuring means reaches a predetermined value;
a guess calculation stop means for holding the guess value; and a guess calculation restart means for restarting the calculation of the guess value calculation means when the actual measured value satisfies a predetermined condition after the guess calculation is stopped by the guess calculation stop means. An electronic thermometer consisting of