JPS6368132A - Portable heart rate meter - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention uses a sensor to convert pulsation of blood vessels associated with the pulsation of the heart (for example, pig waves, pulse pressure, or pulse sound at a measurement site such as a fingertip or earlobe) into an electrical signal. The present invention relates to a portable pulse meter that processes this sensor output to calculate the pulse rate per minute.

[Conventional technology]

Accurate pulse measurement is generally the basis of medical care, along with body temperature measurement, and checking the plates in the morning and evening is one of the important tasks of nurses.

Conventional mobile '#X beat hands are equipped with a photoelectric sensor consisting of a light-emitting element and a light-receiving element attached to the measurement site, such as a fingertip or earlobe, and the light from the light-emitting element is irradiated to the measurement site to measure the amount of transmitted light due to changes in blood volume. Alternatively, changes in the amount of reflected light are converted into changes in current by a light receiving element, the output of this sensor is processed to calculate the pulse rate per minute, and the calculated pulse rate is displayed in analog or digital form.

[Problem that the invention seeks to solve]

However, conventional portable pulse monitors take a relatively long time to stabilize, making it impossible to quickly measure the pulse rate, and it takes a lot of time to measure the pulse rate of a large number of subjects. The problem was that it required .

In addition, there are pulse monitors that set upper and lower limits for the pulse rate and issue an alarm when the calculated pulse rate exceeds the upper limit or falls below the lower limit, but there are pulse monitors that can determine the presence or absence of arrhythmia. There was no.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a portable pulse meter that can quickly measure the pulse rate per minute and the presence or absence of arrhythmia at the same time.

[Summary of the invention]

In order to solve the above-mentioned problems and achieve the above-mentioned objects, the portable pulse meter of the present invention includes a sensor A that converts the pulsation of blood vessels into an electrical signal, and an input of the output of this sensor A, as shown in the first diagram. an analog signal processing section B that amplifies and shapes the signals and converts them into pulses; and an information processing section C that inputs the output pulses of the signal processing section B and calculates the pulse rate p per minute and determines the presence or absence of arrhythmia. The above-mentioned information processing section C is equipped with display sections D+ and D□ which input the output of this information processing section C and display the pulse rate Pr per minute and the presence or absence of arrhythmia, respectively. , a pulse interval calculation unit C+ which inputs and counts the output pulses of the signal processing unit B and calculates the next m pulse intervals jet + bs excluding the first pulse interval tel, and this calculation unit. m pulse intervals calculated by C8 1. □＋LP! Enter the information for...
pg+tH+... Find the average value t, =□, and from this average value tr, the pulse rate per minute Pr = 60
/lp and m pulse intervals tpz, t calculated by the pulse interval calculation unit C8.
■ Calculate their relative value S using the information of..., and calculate this relative value S by a plurality of judgment reference values St, St... determined according to the magnitude of the relative value S. ... and determines the presence or absence of arrhythmia based on the magnitude relationship.

When the sensor A is attached to a measurement site that can detect the pulsation of the blood vessel, the pulsation of the blood vessel is converted by the sensor A into an electrical signal. The output of this sensor A is input to an analog signal processing section B, where it is amplified, shaped, and converted into pulses. The output pulses of the signal processing section 2 are input to the pulse interval calculation section C1 and counted, and the first pulse interval tP1 is divided (the next m pulse intervals bz l tP3 . . . are calculated). This calculated m pulse interval tPt + tps
The information on... is calculated by pulse rate calculation and this average value t
2 to 1 minute pulse rate Pr = 60/b is calculated.

On the other hand, the m pulse intervals 1. □＋jP! . . . information is input to the arrhythmia determination unit C3 to obtain their relative value S, and this relative value S is determined as a plurality of determination reference values S, , S, . . .
The presence or absence of arrhythmia is determined based on the magnitude relationship.

The pulse rate Pr per minute and information on the presence or absence of this arrhythmia are input to the display section, and are displayed in the display sections =DI and D2, respectively.

[Detailed description of the invention]

The present invention will be explained in detail below with reference to the drawings.

FIG. 1 is a block diagram showing the basic configuration of the device of the present invention, and FIG.
Figures (a) and (b1) are external perspective views of an embodiment of the device of the present invention, showing the sensor attached to the main body and the sensor removed from the main body, respectively.

In Figure 1, A is a sensor that converts the pulsation of blood vessels into electrical signals, and is a photoelectric pulse wave sensor that can be attached to a measurement site such as a fingertip or earlobe with a clip A (see Figure 2).
. This photoelectric pulse wave sensor A is attached to the measurement site by clip A, and the light emitting element A, such as an infrared light emitting diode, provided on the inner surface of one arm of clip A illuminates the measurement site to change the blood vessel volume. The change in the amount of transmitted light or the amount of reflected light is converted into a current change by a light receiving element such as a phototransistor provided on the inner surface of the other arm or on the inner surface of one arm.

B is the light receiving element A of this sensor A! This is an analog signal processing section that inputs the current changes obtained from the above, amplifies and shapes them, and converts them into pulses.

C is an information processing section that inputs the output pulses of this analog signal processing section B, calculates the pulse rate p per minute, and determines the presence or absence of arrhythmia, and includes a pulse interval calculation section CI+pulse calculation section C! and an arrhythmia determination unit C3.

In this embodiment, the pulse interval calculation section C is the signal processing section B.
input the output pulses, count 5 pulses each time the reset button R3T (see FIG. 2) is operated, and calculate the next three pulse intervals t2., excluding the first pulse interval tP+. ~In addition to the first function of calculating tF4, there is also a reset button I? Continuously count pulses with ST operation and calculate tP3 + tF4 for each pulse from the next pulse interval tri excluding the first pulse interval tel.
...... and a second function that calculates in order,
The first function is executed by switching the mode switch MODE (see Figure 2) to the first mode position, and the second
The second function is executed by switching to mode position N2.

The pulse rate calculation unit C inputs the information of the three pulse intervals bz to LP4 obtained from this when executing the first function of the pulse interval calculation unit, calculates the average value thereof, and calculates the pulse rate per minute from this average value tP. (Average pulse rate) The pulse interval jP obtained from this when executing the first function of calculating PP-60/b and the second function of the pulse interval calculating section C1! It has a second function of sequentially inputting the information of + tP3 and calculating Pr for each beat.

The arrhythmia determination unit C3 calculates the three pulse intervals tit"' obtained when the pulse interval calculation unit C executes the first function.
Input the information of tP4, compare the size and find the minimum value ja
+maximum value t, 4. Determine the intermediate value 1c (calculated value) S, and if this relative value S is large and small for two criteria S+ and St, if S > 51, there is an arrhythmia, S, if ≧ S > St, re-examination is required. S,? The first function determines that the pulse interval is normal (without arrhythmia when S), and the 28th function of the pulse interval calculation unit C1! The pulse interval obtained from this when executing the function jet + b3・
Input and store the information in order, compare the pulse interval stored first and the pulse interval stored next, and find out that both bz and j, rz+b3 and tP1, ...+1F
It has a second function of checking the difference between a-1 and tl and outputting arrhythmia scent information based on the result.

D inputs the pulse rate per minute Pr obtained from this when executing the first function of the pulse calculation unit C3 or the information for each beat obtained from this when executing the second function, and displays the pulse rate for each beat. A pulse display portion D1 and an arrhythmia display portion that displays arrhythmia odor, information indicating that reexamination is required or no arrhythmia obtained from this when the first function of the arrhythmia determination unit C3 is executed, or arrhythmia presence obtained from this when executing the second function. This is a display section consisting of 2. The pulse rate display section l1lI displays the pulse rate using a 7-segment light emitting diode, etc., and the arrhythmia display section D7 uses red, yellow, and green light emitting diodes R, Y, G, etc. Red R lights up to indicate an arrhythmia, and yellow Y lights up to indicate that arrhythmia is present. Inspection, green G
It lights up to indicate normal heartbeat (no arrhythmia).

E is a DC power source or battery power source obtained by rectifying and smoothing the commercial power supply voltage, especially Ni-Cd that can be charged with a charger.
A secondary battery such as a secondary battery is preferable.

The analog signal processing section B, the information processing section C, and the battery E are housed in the main body F, and the pulse display section D1 and the arrhythmia display section D! , power switch BS, reset button RST, mode switch MODE, light emitting diode BAT for displaying secondary battery voltage change, etc. are located on the main body F.
The sensor A is detachably attached to the upper surface of the main body F.

Attach the sensor A to the measurement site such as the fingertip or earlobe while it is attached to the main body F (see Fig. 2 (al) or after removing it from the main body F (see Fig. 2)), and then press the mode switch MODE. When you switch to the 1st emode position HI and press the reset button flsT, the light emitting element AI
The light is transmitted or reflected from the measurement site, and a change in the amount of transmitted light or reflected light due to a change in blood flow volume is converted into a current change by the light receiving element At.

The current change obtained from the light receiving element At of the sensor A is input to an analog signal processing section B, where it is amplified, shaped, and converted into a pulse. These pulses are input to the pulse interval calculation section CI, and only 5 pulses of Pr-Pr are counted. Since the first pulse Pr is unstable, it is not counted, and the first pulse interval tPI is deleted. The next three pulse intervals tpt"' Lpa (see fal in Figure 3) are calculated from the remaining four pulses P2 to PS. These three pulse intervals tP
The information of 1 to tP4 is obtained by the pulse calculation section, and from this average value t2, the pulse rate per minute Pr "60/b is calculated. This pulse rate 21 per minute is displayed in the pulse display section D of the display section.
+ will be entered and displayed.

On the other hand, the information on the three pulse intervals tri to tpa is input to the arrhythmia determination unit C3 and compared in magnitude, and for example, the maximum value tM '' her intermediate value jc = tpi and the minimum value 1.-1, 4 are determined. From this, a calculated value S is obtained, and this calculated value S is determined to be S > Sr = 0.25 with respect to the two large and small judgment standards Sl -0,25°5t-0,1 determined corresponding to the value. When, with arrhythmia, Sr =
Re-examination required when 0.25≧S >h=0.1 (7)
When 5z=0.1≧S, it is determined that there is no irregularity and the pig is normal). This judgment result is input to the arrhythmia display section D2 on the display. If there is an arrhythmia, the red R lights up, if re-examination is required, the yellow Y lights up, and if there is no arrhythmia, the green G lights up to let you know the judgment result. The 0 display is reset. This will continue until you press button R3T again.

When the mode switch MODE is switched to the second mode position M2 and the reset button R5T is pressed, the pulses obtained from the analog signal processing section B are continuously input to the pulse interval calculation section CI and counted, and the first pulse Pr is counted.・Delete the first pulse interval tP1 from the next pulse interval t0 *P3+ jF4...jFi-1+1
, A... (see the mountain in Figure 3)) are calculated in this order.

This pulse interval jPi jFi... information is sequentially input to the pulse calculation section C2 to calculate the pulse rate Pr for each beat, and this addition information for each beat is displayed in the pulse display section D1 of the display section. The pulse rate is displayed for each beat.

On the other hand, information on the pulse interval 5t+jP3... is sequentially input to the arrhythmia determination unit C3 and stored, and the previously stored pulse interval and the next stored pulse interval are compared, and both tpz and to , tP3 and tP4r ・・””l
jF++-1 and j? ++ difference is checked, and based on the result, information indicating the presence of arrhythmia is output. If no abnormality is recognized from the check results, there will be no output to the display section. Information indicating the presence of an arrhythmia is manually input to the arrhythmia display section D2, and the presence of an arrhythmia can be known by lighting up the red R. This second mode operation is repeated until the reset button R5T is pressed again.

Arrhythmia may be determined as follows. That is, the ratio of the pulse interval stored first to the pulse interval stored next in the arrhythmia determination unit C1 is S = b*/ bs + tps/
lpa, ... hn-I/lp- is calculated,
This calculated value S has four determination reference values 5ff determined corresponding to the calculated value S: 1.25. S4. =1.1. ss
=0.9. S,=0.75 while S>5s=1.
25 or s<s, -0,75 when there is arrhythmia, 5h
=0.75≦S≦5s=0.9 or S4. =1.1≦
Re-examination required when S≦5s=1.25, 5s=0.9≦S
When ≦54=1.1, it may be determined that there is no irregularity and the pig is normal.

Further, in the present invention, as the sensor A, a piezoelectric sensor that converts pulse pressure at a measurement site into an electrical signal, a microphone that converts pulse sound into an electrical signal, or the like may be used.

As described above, according to the present invention, the pulsation of the blood vessel is converted into an electrical signal by the sensor A, this electrical signal is converted into a pulse by the analog signal processing section B, and this pulse is input to the pulse interval calculation section C1 and counted. do! Next m pulse intervals iP excluding the first pulse interval tPI! ,jP3...
The m pulse intervals t,,jP!・・・・・・
... is input to the pulse calculation unit C2 to calculate the pulse rate per minute Pr = 60/b from the average value m, and information on the m pulse intervals b* i h3... are input into the arrhythmia determination unit C1 to obtain their relative value S, and this relative value S is calculated as a plurality of determination reference values Sl, S!... determined according to the relative (l!S). The presence or absence of arrhythmia is determined based on the magnitude relationship, and information on the pulse rate per minute and the presence or absence of arrhythmia is displayed in the pulse display section D1 of the display section.
I input this into the arrhythmia display section D= to display the pulse rate per minute and the presence or absence of arrhythmia, so I can not only know the pulse rate per minute but also the presence or absence of arrhythmia (
Since it can be realized using components of a computing system such as a microprocessor, rapid measurement is possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the basic configuration of the device of the present invention, and FIG.
Figures (a) and (bl) are external perspective views of one embodiment of the device of the present invention, showing the sensor attached to the main body and the sensor removed from the main body, respectively, and Fig. 3 (a). ('b) is the main body. It is an explanatory diagram of the operation of the invention device.A...sensor, A,...light emitting element, A
2... Light receiving element, B... Analog signal processing unit, C... Information processing unit, C3...
Pulse interval calculation section, C2...Pulse calculation section, C3
...Arrhythmia determination section, D...Display section, D
l...Pulse display section, Dz...Arrhythmia display section. Ki2moku (a) Answer 30 (Q) (b)

Claims (1)

[Claims] Sensor A that converts the pulsation of blood vessels into electrical signals; Analog signal processing section B that inputs the output of sensor A, amplifies and shapes it, and converts it into pulses; and the output pulse of signal processing section B is input for one minute. an information processing unit C that calculates the pulse rate P_r of the patient and determines the presence or absence of an arrhythmia;
The information processing section C inputs the output pulses of the signal processing section B. and then count the first pulse interval t_P_
Next m pulse intervals excluding 1 t_P_2, t_P_3
A pulse interval calculating section C_1 calculates ......, and m pulse intervals calculated by this calculating section C_1 are expressed as t.
Input the information of _P_2, t_P_3... and calculate the average value t_P=(t_P_2+t_P_3+...)
/m and calculate the pulse rate P_r per minute from this average value t_P.
= 60/tP using information on the m pulse intervals t_P_2, t_P_3, . . . calculated by the pulse interval calculation unit C_2 and the pulse interval calculation unit C_1 to calculate their relative value S, This relative value S is set to a plurality of determination reference values S_1, S_1, S_1, S_1 and
A portable pulse meter comprising an arrhythmia determination unit C_3 that compares with _2... and determines the presence or absence of arrhythmia based on the magnitude relationship.