JPS6238136A - Pulsimeter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a pulse meter that calculates and displays the number of pulses per predetermined time based on the time interval of pulses.

[Background Art] Generally, in this type of pulse meter that calculates and displays the pulse rate per predetermined time based on the time interval of pulses, if there is a change in the time interval of the pulse of the subject, There was a problem that an accurate pulse rate could not be obtained. In other words, the time interval between human heartbeats is not always constant (even when we are at rest, it fluctuates by a few percent, and it can also vary greatly due to cardiac instability factors such as absent heartbeats, arrhythmias, and double strokes). Therefore, if the pulse rate was calculated by measuring the time interval of the pulse only once, there was a problem that a large error would occur in the measured value.In order to solve this problem, we have developed the following method. In other words, in the first conventional example, as shown in FIG. There is one that calculates the pulse rate X using the following calculation formula.

X = 60 There was a problem in that a large measurement error of 10% occurred.

Therefore, as a second conventional example, as shown in FIG. 5, the time interval T1 to T between each pulse is measured, and
Compare the time interval data corresponding to beats and N+1 beats, and if there is a variation above a certain limit (a variation above a predetermined value or a predetermined ratio), that time interval data is canceled (for example, T, >> T 5 or T, <
<T5, then delete T), and when time interval data for a predetermined pulse rate is obtained, T=(TI+7
2+T, +74), the pulse rate was calculated using the above equation (1). However, in such a conventional example, the time interval T for each beat is -75
Because each measurement is performed separately, the measurement accuracy of the time interval measuring means (measurement timer) is significantly improved (compared to the first conventional example).
For example, if the first measured time interval T is an abnormal value, that time interval T will remain without being canceled, and the final measurement will be There was a problem that errors occurred in the results.

[Object of the Invention] The present invention has been made in view of the above-mentioned α, and its purpose is to improve the measurement accuracy of the pulse rate, and to improve the measurement accuracy of the time interval measuring means. The object of the present invention is to provide a pulse meter that does not need to be very expensive and can be manufactured at a low cost.

[Disclosure of the Invention] (Embodiment) FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, in which a time interval measuring means 1 is attached to the artery of the wrist of the subject and measures the reflection of infrared rays. A pulse sensor 2 that detects arterial pulsation based on the amount, a waveform shaping circuit 3, a counter circuit 4, a basic clock generation circuit 5, and the basic clock generated by the basic clock generation circuit 5 are set at the output of the counter circuit 4. timer circuits 61 to 6. each having a counter that counts for a predetermined period of time; Each timer circuit 61 to 64 determines a time interval TI' to T4' during which a predetermined number of pulses (three in this embodiment) are obtained based on the output of the counter circuit 4 each time a pulse is obtained. The measurement is performed multiple times (four times in the example). Here, each timer circuit 61~
The start timing of 64 is from 1 to 64 as shown in Figure 2.
This is the time when the fourth pulse is obtained, and the time interval Tl until three pulses are obtained sequentially shifted by -beats.
It is designed to measure '~T, °. The pulse rate calculation means 7 also includes a first arithmetic circuit 8 that determines whether a plurality of input time interval data (four in the embodiment) is valid data, and a first calculation circuit 8 that determines whether a plurality of input time interval data (four in the embodiment) is valid data, and a first calculation circuit 8 that calculates the pulse rate using a predetermined formula. Based on this! @2 arithmetic circuit 9, and the pulse rate X per minute is calculated by the following calculation formula.

In addition, in the embodiment, in order to further improve measurement accuracy, the pulse rate calculation means 7 deletes data outside a predetermined range before and after the median value among the four input time interval data,
The pulse rate X is calculated based on the remaining data. The pulse display means 10 includes a decoder 11 and a display 12
The pulse rate X calculated by the pulse rate calculation means 7 is digitally displayed on the display 12.

The operation of the embodiment will be described below with reference to the flowchart shown in FIG. Now, when the power is turned on and measurement is started, the counter circuit 4 and the flag setting section (not shown)
etc. will be cleared.

Next, in the time interval measuring means 1, as shown in FIG.
The counter circuit 4 is stepped up by 1'' in synchronization with the rise of the pulse pulse signal V obtained by waveform-shaping the pulse sensor 2 output V2 by the waveform shaping circuit 3. Then, the output of the counter circuit 4 becomes 1''. The measurement is started, the counter circuit 4 is stepped up sequentially, and the counter circuit 4 output is "
2", '3", and "4", the timer circuit 62.6
Measurements at time intervals T2', T31, and T4° according to 1.64 are started, respectively. On the other hand, each timer circuit 61
-64 time interval T, 1-7, at the stop point of the measurement, the output of the counter circuit 4 is "4", "5"',
'6'', and each timer circuit 6. to 64
Time interval data corresponding to the time intervals T, 1 to 7, + measured at (for example, each timer circuit 6. to 6.
4) is sent to the pulse calculation means 7. The pulse calculation means 7 calculates the median value of the time interval data sent from the time interval measuring means 1, and calculates the median value of the time interval data sent from the time interval measurement means 1, and also calculates the median value of the input time interval data outside the predetermined range (±20%) before and after the median value. Delete the data as abnormal data, use the remaining m pieces of data as valid time interval data, calculate the sum, and use the following calculation formula to calculate the pulse rate per minute
Calculate.

X=mX3X60/D According to the present invention, since the pulse rate The measurement error can be significantly reduced (1/4) compared to the first conventional example, and the measurement accuracy can be increased.
By calculating the pulse rate X by removing abnormal data as in the embodiment, it is possible to further improve the measurement accuracy of the pulse rate X. The pulse rate X thus calculated is sent to the pulse rate display means 9 and digitally displayed on the display 12. It goes without saying that the pulse rate measurement operation described above may be repeated, and in this case,
When the output of the counter circuit 4 becomes "5", 6", '7", the timer circuits 6□, 62.6 are restarted, respectively, and the time intervals -1-, l~T, ° are re-measured. All you have to do is

[Effects of the Invention] As described above, the present invention comprises: a time interval measuring means for measuring the time interval of pulses; a pulse calculating means for calculating the number of pulses per predetermined time based on the measured time interval data; In the pulse meter, the time interval measuring means is configured to measure a plurality of time intervals during which a predetermined number of pulses are obtained; Since the pulse rate calculation means is formed to calculate the pulse rate based on the plurality of time interval data, the accuracy of measuring the pulse rate can be increased compared to the first conventional example. Compared to the conventional example, there is no need to make the measurement accuracy of the time interval measuring means so high, and the cost can be reduced.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of the present invention, Figs. 2 and 3 are explanatory diagrams of the same operation as above, Fig. 4 is an explanatory diagram of the operation of the conventional example, and Fig. 5 is an explanatory diagram of the operation of another conventional example. It is. 1 is a time interval measuring means, 7 is a pulse calculation means, and 10 is a display means. Agent Patent Attorney Ishi 1) Ai Figure 7 4

Claims (2)

[Claims] (1) time interval measuring means for measuring the time interval of pulses;
A time interval at which a predetermined number of pulses are obtained in a pulsometer comprising a pulse calculation means for calculating the number of pulses per predetermined time based on measured time interval data and a pulse display means for displaying the calculated pulse rate. The pulse rate calculating means is formed to calculate the pulse rate based on the plurality of time interval data measured by the time interval measuring means. Pulse monitor. (2) A patent claim characterized in that the pulse rate calculation means is configured to delete data outside a predetermined range before and after the median value among a plurality of time interval data, and calculate the pulse rate based on the remaining data. The pulse meter according to item 1.