JPS58225325A - Electronic clinical thermometer - Google Patents

Abstract

PURPOSE:To obtain a relatively high forecasting accuracy by comparing the current value with the previous value employing an accumulation circuit for temporarily accumulating the temperature detected by a temperature detecting means at the sampling time. CONSTITUTION:A thermosensitive element 10 is connected to a temperature measuring circuit 11 and the output 5 thereof is connected to a temperature memory 17 while the output 37 thereof to temperature threshold detecting circuit 12, a temperature variation detecting circuit 13 and a latch 26. A clock signal generator 14 which is a circuit for generating a basic clock is actuated with the temperature threshold detecting circuit 12 to supply a clock to the temperature variation detecting circuit 13, a time measuring circuit 16 and the temperature memory 17 and the like. For example, four of the oldest data and four of the newest data are carried to a shift average computating section 18 from the temperature memory 17 by a signal 46 to calculate arithmetic means separately. The results of the calculation are taken into an addition circuit 22 together with the temperature Tx of 10sec before and the current temperature T.

Description

Detailed Description of the Invention ■2 Background of the Invention A Technical Field The present invention relates to an electronic thermometer, specifically, a temperature detection means for detecting the temperature of a part to be measured, and a method for predicting an equilibrium temperature according to the detected temperature. The present invention relates to an electronic thermometer including an arithmetic circuit and a display means for displaying temperature.

B. Prior art and its problems Conventionally, in such electronic thermometers, the temperature at thermal equilibrium is predicted from the measured temperature, and this is displayed in advance on the surface where the thermal equilibrium state is reached. This temperature prediction is typically performed by statically monitoring the measured temperature and its rate of change over time, and using a prediction function that uses these two variables and the elapsed time up to the time of monitoring as variables. Therefore, the predicted equilibrium temperature is logically determined by the measured values of these three variables.

Electronic body temperature needles using this type of equilibrium temperature prediction method complete temperature measurement before reaching a thermal equilibrium state, so they have the advantage of short temperature measurement times. However, there is a drawback that the accuracy of prediction is significantly reduced〇■0Object of the Invention The object of the present invention is to provide an electronic body temperature needle with high accuracy in predicting equilibrium temperature.

This object is achieved according to the invention by an electronic body temperature needle as follows. In other words, in this electronic thermometer, the calculation circuit stores a plurality of prediction functions that define temperature changes until the equilibrium temperature is reached using the elapsed measurement time as a variable. It includes a control circuit that controls the temperature detection means and the arithmetic circuit at the time of sampling, and an accumulation circuit that temporarily stores the temperature detected by the temperature detection means at the time of sampling, and the arithmetic circuit: (a) (b) reading out the accumulated temperature from the accumulation circuit, and calculating from the read temperature related to the past sampling time and the measurement elapsed time up to the past sampling time using the selected prediction function; The predicted value of the temperature at the current sampling point is compared with the temperature detected by the temperature detection means in relation to the current sampling point, and the difference between the two is determined. If so, select a new prediction function from among the prediction functions and perform the process (
Returning to b), (d) determining the predicted value of the equilibrium temperature corresponding to the selected prediction function and supplying the calculated predicted value of the equilibrium temperature to the display means, provided that the difference is within a predetermined range. It is something.

According to one aspect of the invention, the prediction function includes first and second prediction functions, the first prediction function being a correction representing the difference between the temperature detected by the temperature sensing means and the predicted value of the equilibrium temperature. The second prediction function is a function for calculating the temperature difference.
This is a function for determining the temperature increment up to an intermediate point based on the detected temperature of the temperature detection means, step (1).
and (c) a second prediction function is selected and step (b
), the predicted value of the temperature at the current sampling point is determined based on the temperature increment determined by the selected second predictive function, and in step (d), the predicted value of the equilibrium temperature is determined based on the selected second predictive function. It is determined based on the corrected temperature difference determined by the prediction function of xi corresponding to the second prediction function.

According to another aspect of the present invention, U = αt + β 0 K (t + r) δ is used as the first prediction function, where Ul-j is the corrected temperature difference, t is time-varying over the course of measurement, and K is the degree of temperature increase O Variable/arming meter, α, β,
r and a are constants ◎ According to another aspect of the present invention, the first prediction function is υ= (aA+b)t+aA+d+K(t+d)A+
@ (t to) / (K-f) is used, U is the corrected temperature difference, t is the measurement elapsed time, A is a variable parameter depending on the part to be measured, K is a variable parameter that indicates the degree of temperature rise, *, b, c, d,・
is a constant, 1o is a constant that indicates a predetermined point in time in the elapsed measurement time, and [] is a symbol that indicates 0 when the value in [ ] is negative, and the value when it is not negative.

According to another aspect of the present invention, the arithmetic circuit supplies the calculated predicted value of the equilibrium temperature to a display means when the difference continues to be within a predetermined range for a predetermined period, and If d continues to be within the predetermined range for less than the predetermined period, the process returns to step (b) at the next time point.

According to another aspect of the invention, the second predictive function selected in step (,) is 0, in which the temperature increase over the measurement elapsed time is an average value. The second prediction function selected in (hot) is one in which the first prediction function corresponding to the second prediction function approaches the equilibrium temperature early with respect to the measurement elapsed time. , a second prediction function corresponding to the first prediction function that gradually approaches the equilibrium temperature with respect to the measurement elapsed time is sequentially selected.

According to another aspect of the present invention, the first and second prediction function overtopping measurement sites are provided according to measurement conditions from the armpit to daytime, and the second The prediction function is a prediction function corresponding to measurement conditions between the armpit and daytime.According to another aspect of the present invention, the control circuit is configured such that the temperature detection means detects a temperature equal to or higher than a predetermined value. , and when the detected temperature shows a rate of increase equal to or higher than a predetermined value, the arithmetic circuit is instructed to start executing steps (b) to (d).

According to another aspect of the invention, in step (b), the temperature associated with said past sampling point is an arithmetic mean value of temperatures detected at a series of a plurality of past sampling points; The temperature detected by the temperature detection means in relation to the current sampling point includes the temperature detected by the temperature detection means at the current sampling point and the temperature detected at at least one past sampling point closest to the current sampling point. is the arithmetic mean value of

(1) Detailed Description and Function of the Invention Next, embodiments of the electronic thermometer according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram showing the basic configuration of an electronic thermometer according to the present invention. This electronic thermometer basically consists of a temperature measurement section 1, a prediction calculation section 2. It is composed of an FF value section 3 and a display section 4. The temperature measurement section 1 has a temperature sensing probe 10 (Fig. 5) such as a thermistor, and is a circuit that measures the temperature of the part to be measured in real time. This circuit predicts the temperature at thermal equilibrium from the current temperature and the temperature at thermal equilibrium from the current temperature. The evaluation section 3 is
It measures the current predicted temperature based on the current temperature information, and instructs to change the predictive calculation f parameter and display the predicted calculation of the temperature at thermal equilibrium according to the evaluation result. The display unit 3 is a display device that visually displays the predicted temperature.

The temperature measuring section 1 measures the temperature in real time, and the results at the sampling time are sent as real-time temperature signals 6 and 9 to the prediction calculation section 2 and the evaluation section 3, respectively.

The prediction calculation unit 2 receives the real-time temperature signal and monitors the elapsed time from the start of measurement according to the measurement start conditions.
A necessary amount of temperature information for past elapsed time is stored. Next, from the past elapsed time information and the past temperature information, a temperature increment is calculated using a prediction function with an average temperature rise over the measured elapsed time, and the current real-time temperature is predicted, and the real-time predicted temperature signal 6 is sent to the evaluation section. Send to 3.

The evaluation unit 3 evaluates the real-time predicted temperature signal 6 based on the real-time temperature signal 9. When the real time temperature and the real time predicted temperature substantially match, that is, the difference between the two is within a predetermined tolerance range, the evaluation section 3 sends an instruction signal indicating the match to the prediction calculation section 2; A predicted temperature signal 8 at the time of thermal equilibrium is outputted from the prediction calculation unit 2. When the real-time temperature and the real-time predicted temperature do not substantially match, the evaluation section 8 sends an instruction signal 7 indicating the mismatch to the prediction calculation section 2, and instructs it to change the value of the parameter used in the prediction calculation. .

When the parameter change instruction signal 7 is input, the prediction calculation unit 2 performs prediction calculation and changes the installed meter, again predicts the current real-time temperature from the past elapsed time information and the past temperature information, and calculates the real-time predicted temperature. Signal 6t - sent to evaluation section 3; below,
This operation is repeated until the real-time temperature and the real-time predicted temperature match. The display unit 4 receives the predicted temperature signal 8 at the time of thermal equilibrium and displays it.

To summarize, in the electronic thermometer according to the present invention, the temperature at the present time is predicted from the temperature actually measured at a certain point in the past using a prediction function that defines temperature changes, and this predicted temperature is compared with the temperature actually measured at the present time, If the difference between the two is within a predetermined tolerance range, the temperature in a thermal equilibrium state is predicted and displayed; if the difference is outside the predetermined tolerance range, the temperature prediction function is changed and this prediction calculation is repeated.

Furthermore, even if the difference is within a predetermined tolerance range, the temperature measurement and prediction calculation are repeated, and if the difference is within the tolerance range a predetermined number of times, the predicted temperature in a state of thermal equilibrium is displayed. Good too. In addition, once the predicted temperature in a thermal equilibrium state is displayed, it is best to operate only that display function and stop all other calculation functions, but even after displaying the predicted temperature in a thermal equilibrium state, temperature measurement and prediction continue to be performed. Repeat the calculation,
The display of predicted temperature may be updated to a more accurate value.

By the way, when measuring body temperature, there are a wide variety of observed temperature changes from the start of measurement to thermal equilibrium, depending on the characteristics of the body temperature needle, the condition of the measurement site, and the characteristics of the site itself. However, by limiting the thermal characteristics of the thermometer, the appearance of these temperature changes can be classified into several basic patterns, that is, the temperature changes can be defined. The very broad classification methods are oral source measurement and axillary source measurement. Although other classification methods are possible, here we will explain body temperature measurement using oral temperature measurement.

When measuring body temperature during the day in many different cases using a thermometer with limited thermal characteristics, it is estimated that
It can be seen that thermal equilibrium is reached in about 5 minutes. If we carefully examine the difference U* between the temperature TII at thermal equilibrium and the temperature T during the measurement, we can see that it follows the following formula with very good accuracy in the relatively early stages of measurement. −T=fft+β+c(t+r)δ
-(1) Here, U*: Difference between temperature at thermal equilibrium and temperature during measurement t: Time from start of measurement C: Variable parameters α, β, γ, δ are well suited for measurement under certain conditions For example, U"=-0,001t+0.05+C(t+1)-'°
0(6≦C≦26)...The formula (2) holds well empirically. Here, when the unit of t is given in [seconds], U
" is given by (C). Therefore, the predicted temperature Tp when the temperature T6 at thermal equilibrium is predicted corresponds to the temperature T at the time of prediction plus the corrected temperature difference U corresponding to equation (2). An arithmetic expression will be assembled.

Therefore 1.0 U = 'rp-'r = -0,001t+0.05+
c(t+1)-(6≦C≦26) (3) is the first prediction function that provides a predicted corrected temperature difference.

FIG. 2 shows a curve when the value of the parameter C is changed from C=6 to C=26. Note that equation (3) also holds true for rectal temperature measurement.

Now, in the flowchart in Figure 3, the process in Figure 1,
An example of an algorithm for the process of making temperature predictions in the device shown in the figure is shown.

In the starting step 101, a stain source is introduced, the temperature measuring section 1 is operated, and the temperature measuring step ioz is started.Then, the prediction calculation section 2
monitors the real-time temperature signal 5 from the temperature measurement unit 1, detects the establishment of measurement start conditions such as the rate of temperature change, executes the elapsed time measurement step 108, and at the same time determines the initial value of the nof parameter in the prediction calculation step. The setting step 104 is shown in the row table, and the parameter of equation (3) is set to C=6. The predictive calculation unit 2 stores temperature and elapsed time information necessary for subsequent steps, and is capable of predictive calculation of the current temperature based on this past information. This step of predicting and calculating the current temperature consists of a temperature increment calculation step 106 and an addition step 106. Since the temperature increment ΔU is defined as the difference between the temperature TX at the elapsed time tX a little before the current time t and the predicted temperature T' at the current time t, in performing this prediction calculation, the following is used as the second prediction function. The formula is applied.

ΔU=UX-U=-0.001 (tx-t)+c t
(tx+t)-'°'-(t+1 house °0) (6≦C≦2
6) ... (4) T' = Tx + ΔU ... (5) In the end, when the addition step 106 is finished in the prediction calculation unit 2, the current elapsed time t and the elapsed time a little earlier are calculated. From t' and the measured temperature TX at t', (4)
, (5), the predicted temperature T/ at the present moment is calculated.

However, in the first calculation step, the parameter C is set to C=6 in the initial setting step 104, as stated above. In this way, the current predicted temperature T' is the real-time predicted temperature signal. 6 to the evaluation unit 3. A real-time temperature signal 9 that corresponds to the current measured temperature T from the temperature measurement unit 1 is input to the evaluation unit 3, and in the evaluation step 107, the current predicted temperature T′ and the current measured temperature T are input. The difference is monitored, and an instruction signal 7 is output according to the following conditions to instruct the next process.

i) When T-T'≧f, proceed to step 108 for increasing the meter C; ii) l'r-'r'l (when f, proceed to corrected temperature difference calculation step 110++i) T-T/≦ -f, the process advances to error display step 109. Here, f is an appropriately selected evaluation function, but if the following function is used, the evaluation process will be relatively easy.

f = (tx + 1)'''1-0 ++ (t +
t ) -1°' - (6) This corresponds to the fact that when t is small, the change in the predicted value when changing the parameter is large, and as t becomes large, the change becomes smaller. . When the value of 910 seconds before the current time t is used for tX, the change in f is as shown in FIG. 4. In principle, equation (6) follows equation (7) below.

f=(Ux, c=e+f Ue=e+t) (Ux
, c=e Ue=e) ”・(7) Now, when the instruction signal 7 instructs the increase step 10g of C in the evaluation step 107, the prediction calculation unit 2 immediately sets the parameter C to C+1 and makes an upper limit judgment. Following step 111 and loop 201, the temperature increment calculation step 105 and addition step 108 are performed again, and the real-time predicted temperature signal 6 is sent to the evaluation unit 3.The same operation is performed thereafter until entering the loop 202 of the corrected temperature difference calculation step 110. Upon receiving the instruction for the correction temperature difference calculation step tio due to the repeated O-force and instruction signal 7, the prediction calculation unit 2
performs addition step 11m with this, and outputs the predicted temperature signal 8 at the time of thermal equilibrium to the display part number. The meaning of entering this loop 202 corresponds to determining that the mother meter in prediction calculation formula (3) is appropriate. Also, evaluation process 1
07, when T-T'≦-f, the instruction signal 7 instructs the display unit 4 through the prediction calculation unit 2 to display an error. Similarly, when C>26 is determined in the upper limit determination step 111 for parameter C and parameter C, the prediction calculation unit 2 instructs the display unit 4 to display an error. Error indications correspond to cases where the normal measurement conditions have been significantly deviated from.

In this way, the present invention predicts the current temperature using a predictive calculation formula based on the past elapsed time and temperature information corresponding to it, and compares this predicted value with the actual measured value.
The prediction calculation formula is modified, this process is repeated, and the optimal prediction calculation formula is selected to accurately predict the temperature at thermal equilibrium. The method explained so far is mainly based on the idea of predicting the current temperature from the past elapsed time and corresponding temperature information and comparing it with the actual measured value. It goes without saying that the concept of predicting and calculating the future temperature from the current temperature information and comparing it with the actual measured value at that time has exactly the same meaning. In addition, the basic formula that gives the difference U* between the temperature at thermal equilibrium and the temperature during measurement is (1
) It is not limited to 2.

As described above, the essential aim of the present invention is to accurately predict and display the body temperature at thermal equilibrium at a stage before reaching thermal equilibrium. Based on this, the current temperature is predicted and calculated, and the prediction calculation formula is corrected by comparing it with the current measured value, and this process is repeated to select the optimal prediction calculation formula and achieve the purpose. It is. Therefore, as long as it does not deviate from this essence, it includes all algorithms that realize this.

For example, in FIG. 3, the corrected temperature difference U calculation unit 5110
It is also possible to place the following display process 1ist immediately before the /4' parameter changing process 10B or immediately before the forest evaluation process 10F.

Therefore, the display will be executed even if 742 meter C is not appropriate, but if it is set as shown, the display will show the rising trend of temperature. The reason for this is that the initial value of the parameter C is set to the minimum value C=6, but this produces an effect that gives the impression of a natural temperature rise to the observer viewing the display.

Figures 5 and 6 are professional diagrams and flowcharts of an electronic thermometer for both daytime and armpit temperature measurement. In this example, the detailed configuration of the example in Figure 1 is also shown so that you can easily think about it. It is. The formula for the corrected temperature difference for oral temperature measurement has been exemplified above, but the first predictive function that can be used for both purposes is 10 (at t≦100, U 1 = (-0D025A-04)035) t + (
15A+055+C(t+1)A...(8)t)
At 100 Us'=(-0,0025A-0,0035)t+0
5A+Os5+C(t+1)A+002(t-100)
/(C+10) (9).

In ζζ, A is a variable parameter, and the variable range of C for A is the same as in Table 1.

When A=-1,00, equation (8) matches equation (3), and A-
-0,6, (8) and (9) are the formulas for the corrected temperature difference in armpit temperature measurement.

In the examples shown in Table 1 and Figure 6, for example, a temperature sensing element such as a thermistor! O is connected to the temperature measurement circuit 11, its output 6 is connected to the temperature memory 17, and three outputs are connected to the temperature threshold detection circuit 12.
．． It is connected to the temperature change detection circuit 13 and the wrap 36. Temperature threshold detection circuit! ! 1 is a circuit that detects whether the real-time temperature signal 37 exceeds a predetermined darkness value.

The temperature change detection circuit 13 is a circuit that detects the rate of change of the real-time temperature signal 37. Latte 26 is a circuit that temporarily stores real-time temperature.

The clock signal generator 14 is a circuit that generates the basic clock signal for operating this device, and is activated by the temperature value detection circuit Hz, and is activated by the temperature change detection circuit 131 and the time measurement circuit 1
Temperature memory 1 is a storage device that stores the temperature output devices of the daughter temperature measurement circuit 11 in chronological order. The output 4- is connected to the moving average calculating section 18. The moving average calculating section 18 is an arithmetic circuit that calculates an arithmetic average, and its output 60 is connected to the adding circuit 32, and the output 63 is connected to the subtracting circuit 23. are connected to each.

The time measuring circuit 16 is a circuit that measures the elapsed time of the m degree measurement based on the clock signal of the clock signal generator 14, and its elapsed time signal 45 is supplied to the main calculation section 20. Further, the 10 seconds elapsed signal 42 is supplied to a control circuit 15, and the control circuit 15 is a control circuit that sends an initial setting signal 44 to the main counter register section 19 in response to the 10 seconds elapsed signal 42.

The main counter register section 19 is connected to the main calculation section 2°. The former is a counting circuit that performs counting by setting the number of times N of one optimal loop circulation, parameters C and A, as will be explained later, and the latter monitors the elapsed time signal 45 and calculates the number of cycles according to the magnitude thereof. Select calculation and processing, calculate the corrected temperature difference U and evaluation function f, monitor the number of circulations N and the corrected temperature difference, instruct the next process according to the size, output the corrected temperature difference, etc. This is a circuit that performs calculations and processing.

The output 48 of the main calculation section 20 is connected to the temperature increment calculation circuit 21, and the output 61 is connected to the evaluation calculation section 24. Temperature increment calculation circuit 21ii is a circuit for calculating the temperature increment ΔU, and the evaluation calculation unit 24 calculates the result of predicting the current temperature using data from 10 seconds ago using the measurement function f given by the main calculation unit 34. This is a circuit that evaluates the difference from real-time temperature. The instruction signal 7, which is the evaluation output, is input to the main counter register section 19.

An instruction signal output 54 of the main calculation section 20 is connected to an adder circuit 26, and an output 56 of the adder circuit 25 is connected to a display 27. The addition circuit 26 is an addition circuit that calculates the predicted temperature T at the time of thermal equilibrium. The display 27 displays the predicted temperature Tp1 at the time of thermal equilibrium calculated by the addition circuit 25 or
A buzzer 28 is connected to the instruction output 55 of the main arithmetic unit 2o, which is a display device that visually displays the real-time temperature latched by the temperature sensor, and the buzzer 28 is a sounder that audibly indicates the end of temperature measurement. .

Now, for body temperature measurement, in the start step 101, the temperature measurement circuit 11 receives the electrical output 36 of the temperature sensing element 10 and carries out the temperature measurement step 1011.The three real-time temperature signals from the temperature measurement circuit 11 are as follows. By performing the dark value detection step 11B in the temperature dark value detection circuit 12, when the preset dark value exceeds 30°C, for example, the ON signal 38 is changed to the ON signal 38.The ON signal 38 is a black or red signal. A cycle start step 116 is performed by activating the generator 14. The black/red signal generator 14 sends a clock signal 40 to the temperature change detection circuit 13. The temperature change detection circuit 13 detects a temperature change using the real-time temperature signal 37 and the black/red signal 40 in step 17. For example, 0.0 seconds per second. Determine whether there is a temperature rise greater than the IC. When the temperature change exceeds this dark value, the temperature change detection circuit 13 sends an ON signal 39 to the control circuit 15 to put the control circuit 16 into operation.

When the control circuit 16 becomes operational, it receives a control signal! I
9 to the time measuring circuit 16, causing the time measuring circuit 16 to start receiving the clock signal 43 from the clock signal generator 14, and execute the elapsed time measuring step 108.

The time measurement circuit 16 sends an elapsed time signal 45 and a 10 second elapsed signal 42 to the main calculation unit 20 and the control circuit 15, respectively.
．． In the latter case, instructions for initial value setting steps IX9 and 120 are given to the control circuits 1!6 as outputs of the results of step 118. Step 118 is for stopping the calculation process because it is clear that the prediction process below is completely unreliable over a time period of less than 10 seconds. The control circuit 1B receives the 10 second elapsed signal 42 and receives the initial value setting signal 4.
4 to the main counter register section 19, the optimum loop circulation number N to be described later is set to N=O, and the parameter A is set to A=-0, 8.
Initialize C to C=10.

On the other hand, the elapsed time signal 45 from the time measurement circuit 16 is input to the main calculation section 20 and used together with the nodal meter signal 47 from the main counter register 19 in the calculations of equations (3) and (9). The main calculation unit 201C has a function of monitoring the elapsed time signal 45 and selecting a calculation step and a processing step according to its magnitude, a corrected temperature difference U, and a measurement function f to be described later.
(represented by !locks 83 and 84, respectively), a function to monitor N and the corrected temperature difference, a function to instruct the next process according to the individual's preference, and a function to output the corrected temperature difference. It is being In calculating the corrected temperature difference U, two corrected temperature differences are obtained for the elapsed time t and a previous time tx, for example t-10 (ie, 10 seconds before) using the same parameter. These differences correspond to the second prediction function for determining the temperature increment ΔU, and correspond to equation (4). Bat
x-t)+c((t,+0-A-(t+t)A)...
(11 t)ΔU at 100! =Ux-U=leaf 0.0025A-0,0035)
(tx-)+c((tx+t)'L(t+t) 勺〇, 02(tX-t)/(C+10) ・(t
l) ◇ Now, the judgment steps 121 and 1z9 are executed by the above-mentioned functions of the main calculation section 20, and the corrected temperature difference calculation step 18 according to equations (8) and (9)! Or enter 136. The corrected temperature difference U is sent, for example, every second for the purpose of being used in the calculation step 122 in the multi-temperature increment calculation circuit 21 as the two signals 4B for t and tx. The flowchart in Figure 6 shows the algorithm for calculating ΔU using the formula (10,α■, but this part is
As shown in the block diagram in the figure, it is also possible to make the calculation of U into a subroutine.

A temperature memory section 17 is connected to the temperature output 5 wires of the temperature measurement circuit 11.
According to the storage instruction signal 41 sent from the clock signal generator 14 every second, for example, the old data is stored as (for example, 14 pieces of data for 14 seconds) ◎The new data is sampled and the latest When stored in the data storage location, the oldest data is discarded.For example, from the 0 temperature memory 17, the oldest four pieces of data and the newest four pieces of data are sent to the moving average calculation unit 18 by a signal 46. The arithmetic mean value is calculated here. Each of these calculation results is the nominal temperature T
X and the current temperature T, and the former is input as a Tx signal 0 to an addition circuit 2z that performs an addition step 106 for real-time predicted temperature calculation. Note that the reason why values such as T and TX are handled using moving average values is to prevent temporary fluctuations in the results, and is not necessarily an essential process.

By adding the adder circuit 22, the output ΔU of the temperature increment calculation circuit 31
and the output Tx of the moving average calculation unit 18 is performed, and the real-time predicted temperature signal 6 is output to the subtraction circuit 23. The subtraction circuit 23 receives the T output device 3 from the moving average calculation unit 18, subtracts the real-time predicted temperature T' from T, and outputs the result 5! ! It is sent to the evaluation calculation unit 24 as The evaluation calculation unit 24 uses the evaluation function output (f) 61 from the main calculation unit zO to calculate the difference between the actual temperature and the result of predicting the current temperature from data from 10 seconds ago.
Evaluate by f. In this case, the evaluation function f is basically
7) In 10<1≦100, t, = (tX+t)A-(10t)A
...0 t>ioo, t, = (tx+t)A-(t+t)A+002(1/
(c ten N) -1/(c+1o))(tx-t)-(1
It becomes 1.

The evaluation results are divided into three parts: 1) When T-T'≧f, proceed to the step of increasing the /9 parameter C; ii) When IT-T'l<f, proceed to the next step without changing the parameter! If) When T-T/≦-f, an instruction signal 7 for proceeding to the step of decreasing the meter C is output.

When entering step 11B of increasing parameter C,
After setting N=Q, the current value of the CA counter register 31 is increased by one. At the same time, judgment step 1
At $1, the maximum value is monitored according to Table 1. CM
When Ax is exceeded, the current value of the A counter register 31 is increased by 0.1, and the current value of the A counter register 31 is increased by 0.1. In addition, the value of A is monitored in the judgment step 188, and when A>-0, 6, the current value of the A counter register 31 is increased by 0.1. - Sends a signal 58 to the display 27, causing it to display, for example, E. When a NO sign is given in the judgment step 181.1!18, the process automatically returns to the start of calculation again.

When entering a loop in which the N4 parameter is not changed, the N counter register 3o executes step 1a6, and then enters corrected temperature difference calculation step 185 or 186. Since a loop in which parameters are not changed is passed when the parameters used in the calculation are appropriate, a step 126 is provided to check the optimal number of Roug cycles N to record whether the loop has been continuously circulated. The corrected temperature calculation result is monitored by the main calculation unit 20. 1) When U<0, proceed to the end process; 1:) When 0≦U<o, 1, proceed to the display process; m)U
When ≧0.1, an instruction signal is issued to the determination process of the optimal loop circulation number N.

If the corrected temperature difference U is 0.1°C or more, judgment step 150
Indication signal 5 only when the optimal number of loop circulations N is 3 or more.
4 is output, and the addition step 11m of the addition circuit 2G is performed. The judgment step 150 includes steps 119, 124, la
Together with g and 1'a6, this is intended to display the predicted temperature at thermal equilibrium only when the optimum loop has been passed three or more times in succession. However, when U (0, 1), there is no need for this, so if 0≦U (0, 1, the process immediately goes to addition step 11!, and if U is 0, the process immediately goes to step 140 for displaying the real-time temperature. Arco.

A rhythm is created.

The real-time temperature signal and the corrected temperature difference, which are not shown in FIG. and displayed in the display step 1111. The instruction signal 66 in the case of U (0 operates the latch 26, latches the three real-time temperature signals, executes the real-time temperature display step 140 at the latch output 57, and enters the end step 154. At the same time, the buzzer 1 step Buzzer circuit 2 due to buzzer sounding by 151
When an instruction is issued to proceed to the step of decreasing the meter C, step 11, which is exactly the same as the step of increasing the meter C, is given.
7.180,18! , 187 are implemented.

In this example, oral temperature measurement for A=-1,0, A=-0
, 6 is automatically determined, and body temperature prediction suitable for each temperature measurement method is performed. In addition, the part 70 surrounded by a dashed line in FIG.
It is not known until now that it can be implemented on a microcomputer.

■9 Specific Effects of the Invention The electronic thermometer according to the present invention modifies the prediction calculation parameters, that is, the prediction function, according to the evaluation results while evaluating the prediction results of the selected prediction function, so that relatively high prediction accuracy can be achieved. It's late. Further, since the type of prediction calculation formula and the parameters included therein can be arbitrarily selected, temperature prediction can be performed with high accuracy according to each of oral temperature measurement and armpit temperature measurement using the same electronic thermometer.

[Brief explanation of the drawings] Fig. 1 is a diagram showing the basic configuration of the electronic body temperature needle according to the present invention, Fig. 2 is the predicted corrected temperature difference U time for C = 6 to 26 in oral temperature measurement. Figure 3 is a flowchart showing the operation of the device shown in Figure 1. Figure 4 is an example of the measurement function f when the past time tX is 0 seconds before the current time t. FIG. 5 is a flowchart showing the operation of the device shown in FIG. Explanation of symbols of main parts l...Temperature measurement section 2...Prediction calculation section 3...Evaluation section 4...Display section lO...Temperature sensing element 11...Temperature measurement circuit 14... Clock signal generator 16...Control circuit 16...Time measurement circuit 17...Temperature memory 19...Main clock/data register section 20...Main calculation section 21...Temperature increment calculation circuit 22... - Addition circuit 23... Subtraction circuit z4... Evaluation calculation section 216... Addition circuit z6... Ji, Ji 27... Display

Claims (1)

[Claims] 1. An electronic thermometer comprising: a temperature detection means for detecting the temperature of a part to be measured; an arithmetic circuit for predicting an equilibrium temperature according to the detected temperature; and a display means for displaying the temperature, The arithmetic circuit stores a plurality of prediction functions that define temperature changes up to the equilibrium temperature using the measurement elapsed time as a variable, and the electronic thermometer measures the measurement elapsed time and detects the temperature at the sampling point. and a control circuit for controlling an arithmetic circuit, and an accumulation circuit for temporarily accumulating the temperature detected by the temperature detection means at the sampling time, the arithmetic circuit (a) selecting one prediction function, and (b) ) Read the accumulated temperature from the accumulation circuit, and calculate the current sampling calculated by the selected prediction function from the temperature related to a past sampling point among the read temperatures and the measurement elapsed time up to the past sampling point. comparing the predicted value of the temperature at the time point with the temperature detected by the temperature detection means in relation to the current sampling time point and determining the difference between the two; (,) if the nuclear ship is outside the predetermined range; Select one new prediction function and return to step (b) at the next sy f +7 (d) If the difference is within the predetermined range, it corresponds to the selected prediction function. An electronic body temperature needle characterized in that the predicted value of the equilibrium temperature is determined and the predicted value of the determined equilibrium temperature is supplied to the display means. 2. the prediction function includes first and second prediction functions;
The first prediction function is a function for determining a corrected temperature difference representing the difference between the temperature detected by the temperature detection means and the predicted value of the equilibrium temperature, and the second prediction function is a function for determining a corrected temperature difference representing the difference between the temperature detected by the temperature detection means and the predicted value of the equilibrium temperature. A function for calculating the temperature increment up to the intermediate point in time based on the detected temperature.
In c) a second prediction function is selected, and in step (b):
A predicted value of temperature at the current sampling point is determined based on the temperature increment determined by the selected second predictive function, and in step (d), a predicted value of equilibrium temperature is determined based on the temperature increment determined by the selected second predictive function. 2. The electronic thermometer according to claim 1, wherein the temperature difference is determined based on the corrected temperature difference determined by the first prediction function corresponding to the prediction function. 3. U = αt + β 10K (10r)' is used as the first prediction function, where U is the corrected temperature difference, t is the measurement elapsed time, K is a variable parameter indicating the degree of temperature rise, a, β, 1
．． 3. The electronic body temperature needle according to claim 2, wherein a is a constant. 4. As the first prediction function, U = (aA+b)t+aA+d+K(t+d)A
+e(t-to:]/(K+f) is used, U is the corrected temperature difference, t is the measurement elapsed time, A is a variable parameter depending on the part to be measured, K is a variable parameter indicating the degree of temperature rise, ' + b* e
g d H@ is a constant, 1o is a constant that indicates a predetermined point in the elapsed measurement time, and [] is a symbol that indicates 0 when the value in [ ] is negative, and a symbol that indicates the value when it is not negative. An electronic thermometer according to claim 2. 5. The arithmetic circuit determines that the difference is within a predetermined range.
When □ continues for a predetermined period, the calculated equilibrium temperature predicted value is supplied to the display means, and the difference t continues to be within a predetermined range for less than the predetermined period. The electronic thermometer according to any one of claims 2 to 4, wherein the electronic thermometer returns to step (b) at the next sampling point. 6. The second prediction function selected in step (,) is:
The electronic thermometer according to any one of claims 2 to 4, characterized in that the temperature rise over the elapsed measurement time is average. 7. The prediction function selected in step (,) is
The first prediction function corresponding to the prediction function of is one that approaches the equilibrium temperature early with respect to the measurement elapsed time, and step (c)
In this method, the second prediction function corresponding to the first prediction function that gradually approaches the equilibrium temperature with respect to the measurement elapsed time is sequentially selected. The electronic body temperature needle described in any of the above. 8. The first and second prediction functions are set according to the measurement conditions in which the part to be measured ranges from the armpit to the mouth, and the second prediction function selected in step (a) is set between the armpit and the mouth. The electronic thermometer according to any one of claims 2 to 4, characterized in that the prediction function corresponds to measurement conditions between daytime and daytime. 9. The control circuit causes the arithmetic circuit to perform steps (b) to (d) when the temperature detection means detects a temperature equal to or higher than a predetermined value and the detected temperature shows a rate of increase equal to or higher than the predetermined value. The electronic thermometer according to any one of claims 1 to 4, wherein an instruction to start execution is given. 10. In step (b), the temperature associated with the past sampling time is an arithmetic mean of the temperatures detected at a series of multiple past sampling times; The temperature detected by the temperature detection means is an arithmetic average value of the temperature detected by the temperature detection means at the current sampling time and the temperature detected at at least one past sampling time closest to the current sampling time. The electronic thermometer 0 according to any one of claims 1 to 4, characterized in that