JPH09220205A - Automatic blood pressure measuring instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably measure a highly reliable blood pressure value. SOLUTION: From the fluctuation of the heart beat cycle TRR of a living body continuously detected by a heart beat cycle detection means 82, by a heart beat cycle fluctuation signal extraction means 84, first heart beat cycle fluctuation signals LFCRR which are prescribed frequency components lower than the respiration of the living body and second heart beat cycle fluctuation signals HFCRR which are the fluctuation components of the heart beat cycle generated almost synchronously to the respiration of the living body are extracted. When the strength ratio of the first heart beat cycle fluctuation signals LFCRR to the second heart beat cycle fluctuation signals HFCRR becomes equal to or less than a prescribed value, the blood pressure measurement of the living body by a blood pressure measurement means 80 is started by a blood pressure measurement starting means 86. Thus, since the blood pressure measurement is started only when the excitation of a sympathetic nerve is low and the tension of a person to be measured is sufficiently dissolved, the highly reliable blood pressure value is stably measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic blood pressure measuring device for measuring blood pressure in a living body.

[0002]

2. Description of the Related Art An automatic blood pressure measuring device for measuring blood pressure in a living body is generated, for example, in synchronization with the heartbeat of the cuff in the process of changing the pressure applied to the cuff wound around a part of the living body. There is known an automatic blood pressure measurement device that detects a pulse wave and determines a blood pressure value of a living body by a well-known oscillometric method based on a change in the amplitude of the pulse wave.
For example, this is the automatic blood pressure measurement device described in Japanese Patent Application Laid-Open No. 6-292660.

[0003]

However, in general, the blood pressure value greatly changes according to the psychological state and heartbeat of the subject,
For example, the blood pressure value measured when the subject is extremely nervous, such as when the blood pressure is measured by a doctor or the like, or is measured before the subject's heartbeat is still sufficiently stable. The blood pressure value and the like indicate values that are far from the true blood pressure value of the measurement subject, and generally have low reliability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an automatic blood pressure measuring device capable of stably measuring a highly reliable blood pressure value. .

[0005]

A first aspect of the present invention for achieving the above object is to provide an automatic blood pressure measuring device having blood pressure measuring means for measuring a blood pressure value of a living body, comprising: ) A predetermined frequency lower than the respiratory frequency of the living body based on the heartbeat cycle detecting means for continuously detecting the heartbeat cycle of the living body, and (b) the fluctuation of the heartbeat cycle of the living body continuously detected by the heartbeat cycle detecting means. Heartbeat period fluctuation signal extraction means for extracting a first heartbeat period fluctuation signal which is a component,
(C) Blood pressure measurement starting means for starting the blood pressure measurement of the living body by the blood pressure measuring means based on the intensity of the first heartbeat cycle fluctuation signal.

[0006]

In this way, the predetermined frequency component lower than the respiratory frequency of the living body is extracted by the heartbeat cycle fluctuation signal extracting means from the fluctuation of the heartbeat cycle of the living body continuously detected by the heartbeat cycle detecting means. The first heartbeat cycle fluctuation signal is extracted, and the blood pressure measurement of the living body by the blood pressure measurement means is started by the blood pressure measurement starting means based on the intensity of the first heartbeat cycle fluctuation signal. Therefore, the blood pressure measurement is started only when the intensity of the first heartbeat cycle fluctuation signal is less than or equal to a predetermined value, that is, when the excitability of the sympathetic nerve is low and the subject's tension is sufficiently released. Therefore, a highly reliable blood pressure value can be stably measured.

[0007]

More preferably, (a) the heartbeat cycle fluctuation signal extraction means extracts the fluctuation of the heartbeat cycle of the living body continuously detected by the heartbeat cycle detection means from the fluctuation of the first heartbeat cycle. In addition to the heartbeat cycle fluctuation signal, a second heartbeat cycle fluctuation signal, which is a predetermined frequency component approximately equal to the respiratory frequency of the living body, is extracted, and (b) the blood pressure measurement starting means is the heartbeat cycle fluctuation signal extracting means. The blood pressure measurement of the living body by the blood pressure measuring means is started based on the intensity ratio of the first heartbeat cycle fluctuation signal and the second heartbeat cycle fluctuation signal extracted by. With this configuration, when the intensity ratio of the first heartbeat cycle fluctuation signal and the second heartbeat cycle fluctuation signal is less than or equal to a predetermined value set in advance, that is, the excitement degree of the sympathetic nerve is low and Since the blood pressure measurement is started only when the tension is sufficiently released, the blood pressure value with high reliability can be stably measured. Furthermore, as compared with the case where the degree of tension of the person to be measured is determined only based on the strength of the first heartbeat cycle fluctuation signal, when the signal strength of the whole fluctuation signal extracted from the fluctuation of the heartbeat cycle of the living body is large, etc. Since the influence of individual differences is eliminated, the determination accuracy is improved.

[0008]

A second aspect of the present invention for achieving the above object is to provide an automatic blood pressure measuring device having blood pressure measuring means for measuring a blood pressure value of a living body, comprising: ) A heart rate calculating means for continuously calculating the heart rate of the living body from a predetermined relationship based on the heartbeat cycle of the living body, and (b) a heart rate of the living body continuously calculated by the heart rate calculating means. From the judgment reference heart rate calculation means for calculating the judgment reference heart rate by statistically processing the heart rate within the set constant section, and (c) the judgment reference heart rate calculated by the judgment reference heart rate calculation means. The blood pressure measurement starting means for starting the blood pressure measurement of the living body by the blood pressure measuring means when the deviation of the heart rate subsequently calculated by the heart rate calculating means falls within a predetermined range.

[0009]

[Effects of the Second Invention] With this configuration, the heart rate within a preset constant section of the heart rate of the living body continuously calculated by the heart rate calculation means is statistically calculated by the judgment reference heart rate calculation means. Are processed, the judgment reference heart rate is calculated. Then, when the deviation of the heart rate subsequently calculated by the heart rate calculating means from the judgment reference heart rate is within a predetermined range, the blood pressure measurement of the living body by the blood pressure measuring means is performed by the blood pressure measurement starting means. Be started. Therefore, since the blood pressure measurement is started only when the fluctuation range of the heart rate of the living body falls within the predetermined range, that is, when the heartbeat of the measurement subject is sufficiently stable, the blood pressure value with high reliability is obtained. Is measured stably.

[0010]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a perspective view showing an automatic blood pressure measurement device 8 with an electrocardiographic waveform detection function.

In FIG. 1, a box 10 is provided with a through hole 14 into which a right arm 12 of a subject is inserted. In the through hole 14, a bag-shaped flexible cloth and a rubber bag are provided. A belt 16 which is provided with a cuff 15 formed on the inner peripheral surface thereof and held in a cylindrical shape is provided. Further, a first armrest 17 for supporting the right arm 12 of the subject protruding from the through-hole 14 is provided at the rear side of the through-hole 14 so as to be inclined upward, and a tip of the first armrest 17 is provided. In order to detect an electrocardiographic waveform generated with the action potential of the myocardium of the subject, the electrode 18 is disposed so as to be in good contact with the wrist of the right arm 12 of the subject. . The first armrest 17 keeps the muscles from the elbow to the wrist of the right arm 12 of the subject constantly relaxed so that an accurate ECG waveform can always be detected from the wrist of the subject. It has an optimal support surface shape that supports the entire area from the elbow to the wrist so that it can be leaned. On the left side of the box 10, a second armrest 19 for supporting the left arm 13 of the subject is provided.
Similarly, an electrode 18 is arranged at the tip of the armrest 19 so as to contact the wrist of the left arm 13 of the measurement subject in order to detect the electrocardiographic induction waveform of the measurement subject. The second armrest 19 is also similar to the first armrest 17 so that the muscles from the elbow to the wrist of the left arm 13 of the subject are continuously relaxed from the elbow to the wrist. It has an optimal support surface shape to support it. The start switch 2 is provided on the operation panel 20 of the box 10.
2, stop switch 24, printer 26, card slot 2
8 and the like, and a display panel 30 is provided with a systolic blood pressure display 32, a diastolic blood pressure display 34, a pulse rate display 36, and a time display 38, respectively.

FIG. 2 is a block diagram illustrating a circuit configuration of the automatic blood pressure measurement device 8. In FIG. 2, the cuff 15 is connected to a pressure sensor 40, a switching valve 42, and an air pump 44 via a pipe 46. The switching valve 42 is configured to supply a pressure into the cuff 15 to allow a pressure to be supplied. It is configured to be able to switch between three states: a state, a slow discharge state in which the cuff 15 is gradually discharged, and a rapid discharge state in which the cuff 15 is rapidly discharged. Further, the belt 1 is provided with the cuff 15 on the inner peripheral surface and is wound in a cylindrical shape.
One end of 6 is fixed, and the other end is configured to be tightened by a drum 50 driven by a DC motor 48 with a speed reducer. The pressure sensor 40 detects the pressure in the cuff 15 and supplies a pressure signal SP representing the pressure to the static pressure discrimination circuit 52 and the pulse wave discrimination circuit 54, respectively.

The static pressure discriminating circuit 52 has a low-pass filter, discriminates a cuff pressure signal SK representing a steady pressure, ie, a cuff pressure, contained in the pressure signal SP, and converts the cuff pressure signal SK into an A / D converter 56. To the electronic control unit 58 via The pulse wave discrimination circuit 54 includes a band-pass filter, and a pulse wave signal S which is a vibration component of the pressure signal SP.
The pulse wave signal SM ₁ to discriminate the M ₁ in frequency A / D
The electric power is supplied to the electronic control device 58 via the converter 60. The cuff pulse wave represented by the pulse wave signal SM ₁ is a pressure vibration wave generated from the brachial artery (not shown) and transmitted to the cuff 15 in synchronization with the heartbeat of the measurement subject.

The electronic control unit 58 includes a CPU 62, R
The CPU 62 is configured by a so-called microcomputer including an OM 64, a RAM 66, and an I / O port (not shown). The CPU 62 processes an input signal according to a procedure stored in the ROM 64 in advance while using the temporary storage function of the RAM 66. To output drive signals and display signals. That is, when measuring the blood pressure, the CPU 62 drives the DC motor 48 with a speed reducer in accordance with a predetermined procedure to wind the cuff 15 around the upper arm of the living body, and drives the air pump 44 to cause the cuff 15 to move the upper arm. Portion, and then the switching valve 42 is driven to gradually reduce the compression pressure of the cuff 15. Based on the pulse wave signal SM ₁ and the cuff pressure signal SK obtained in the slow down process, the blood pressure is oscillometrically determined. The value is determined, and the blood pressure value is displayed on the systolic blood pressure display 32 and the diastolic blood pressure display 34, and at the same time, sequentially stored in the blood pressure value storage area 69 of the storage device 68. The storage device 68 is a magnetic disk,
It is constituted by a well-known storage device such as a magnetic tape, a volatile semiconductor memory, or a nonvolatile semiconductor memory.

The electrocardiography device 70 is connected to the right arm 12 of the subject.
Pair of electrodes 1 brought into contact with the wrist of the left arm 13 and the wrist of the left arm 13
Through 8, an electrocardiographic waveform indicating the action potential of the myocardium, that is, a so-called electrocardiogram is continuously detected, and a signal indicating the electrocardiographic waveform is supplied to the electronic control device 58.

Next, the essential part of the control function of the electronic control device 58 corresponding to the first invention in the automatic blood pressure measuring device 8 will be described based on the functional block diagram of FIG. In FIG. 3, the blood pressure measuring means 80 is based on a change in the amplitude of the cuff pulse wave sampled by the pulse wave discriminating circuit 54 via the pressure sensor 40 in the gradual pressure reduction process of gradually decreasing the compression pressure of the cuff 15. The systolic blood pressure value SBP and the diastolic blood pressure value DBP of the subject are measured by the well-known oscillometric method. The heartbeat cycle detection means 82 continuously detects the heartbeat cycle T _RR (msec) of the living body for each heartbeat by detecting the time interval of the electrocardiographically induced waveform detected by the electrocardiographic induction device 70, for example, the time interval between R waves. To do. The heartbeat cycle T _RR thus continuously detected has fluctuations (variations) as shown in FIG. 4, for example.

The heartbeat cycle fluctuation signal extraction means 84 is composed of a first heartbeat composed of a predetermined frequency component lower than the respiration of the living body based on the fluctuation of the heartbeat cycle T _RR of the living body continuously detected by the heartbeat cycle detection means 82. Periodic fluctuation signal LFC _RR ,
A second heartbeat cycle fluctuation signal HFC _RR , which is a fluctuation component of a heartbeat cycle that occurs substantially in synchronization with the respiration of the living body, is extracted. In the heartbeat period fluctuation signal extracting means 84, the fluctuation of the heartbeat period T _RR is subjected to frequency analysis by using, for example, a fast Fourier transform (FFT) method or an autoregressive (AR) method, and the vicinity of the respiratory frequency band of the living body (for example, 0). 0.25 Hz)
The signal strength (signal power) of the frequency component having the peak generated in the second heartbeat cycle fluctuation signal HFC _RR is output, and the frequency is in the vicinity of the frequency band of about 1/3 to 1/4 of the respiratory frequency of the living body (for example, 0. The signal strength (signal power) of the frequency component having the peak occurring at 07 Hz) is output as the first heartbeat cycle fluctuation signal LFC _RR . FIG. 5 shows the signal strengths of the first heartbeat cycle fluctuation signal LFC _RR , the second heartbeat cycle fluctuation signal HFC _RR , and the 0 Hz frequency component (DC component) signal DC _RR extracted from the fluctuation of the heartbeat cycle T _RR. Shows.

The blood pressure measurement starting means 86 determines the intensity ratio (LFC _RR / HFC _RR ) of the first heartbeat cycle fluctuation signal LFC _RR and the second heartbeat cycle fluctuation signal HFC _RR output by the heartbeat cycle fluctuation signal extraction means 84. When the value becomes equal to or less than the predetermined value X which is set in advance, the blood pressure measurement of the living body by the blood pressure measurement means 80 is started. The predetermined value X is a constant value calculated when the tension of the person to be measured is sufficiently released, and is experimentally calculated in advance.

FIG. 6 is a flow chart for explaining the main part of the control operation of the electronic control unit 58 corresponding to the functional block diagram of FIG. In step SA1 of FIG. 6 (hereinafter, the steps are omitted), it is determined whether or not the magnetic card 74 has been inserted into the card insertion slot 28 of the card reading device 72. If the determination in step SA1 is negative, this routine is ended, but if the determination is affirmative, the ID signal recorded in the magnetic card 74 in SA2 is read.

At next SA3, it is judged whether or not the read ID signal is previously registered in the storage area of the storage device 68. If the determination in SA3 is negative, that is, if the ID signal recorded in the magnetic card 74 is unregistered, SA16 described below is executed and the magnetic card 74 is sent out from the card insertion port 28. However, if the determination at SA3 is affirmative, that is, if the ID signal recorded on the magnetic card 74 has been registered,
At SA4 corresponding to the subsequent heartbeat cycle detecting means 82,
By detecting the time interval of the electrocardiographically induced waveform, for example, the time interval between R waves, the heartbeat cycle T _RR of the living body is continuously detected for each heartbeat.

Next, in SA5, the above-mentioned heartbeat period T
_It is determined whether the _RR is detected for a predetermined number of beats or more.
The predetermined number of beats is the minimum number of beats required for stable detection of a highly reliable heartbeat period fluctuation signal in SA6, which will be described later, and is calculated in advance by experiment. If this judgment is denied, SA4 to SA5 are repeatedly executed, but if this judgment is affirmed,
At SA6 corresponding to the heartbeat cycle fluctuation signal extraction means 84, the first heartbeat cycle fluctuation signal LFC _RR consisting of a predetermined frequency component lower than the respiration of the living body and the fluctuation of the heartbeat cycle T _RR of the living body and The second heartbeat cycle fluctuation signal HFC _RR , which is a fluctuation component of the heartbeat cycle generated in synchronization, is extracted.

Next, S corresponding to the blood pressure measurement starting means 86
A7 is executed. At SA7, it is determined whether or not the intensity ratio (LFC _RR / HFC _RR ) between the first heartbeat cycle fluctuation signal LFC _RR and the second heartbeat cycle fluctuation signal HFC _RR has become equal to or less than a preset predetermined value X. It When this determination is denied, the above SA4 to SA7 are executed again, but when this determination is affirmed, the blood pressure measurement operation of SA8 and below is started. First, at SA8, the switching valve 4
2 is switched to the pressure supply state and the air pump 44 is driven to set the cuff pressure P to the preset target cuff pressure P.
_After the pressure is increased to ₁ (for example, a pressure of about 180 mmHg), the air pump 44 is stopped. Then SA
At 9, the switching valve 42 is switched to the gradual exhaust state so that the gradual pressure reduction in the cuff 15 is started.

Next, in SA10, the pulse wave signal SM
₁ is read, and it is determined whether or not one pulse wave is detected. If the determination is negative, SA10 is repeatedly executed, but if the determination is affirmative, the blood pressure measuring means 8 is executed.
The blood pressure measurement routine of SA11 corresponding to 0 is executed. In this blood pressure measurement routine, the systolic blood pressure value SBP ₁ , according to a well-known oscillometric blood pressure value determination algorithm, based on the change in the amplitude of the cuff pulse wave that is sequentially detected in the process of gradually decreasing the cuff pressure P, The minimum blood pressure value DBP ₁ and the average blood pressure value MBP ₁ are determined, and the pulse rate HR ₁ is determined based on the cuff pulse wave generation interval.

Next, in SA12, the maximum blood pressure value S
It is determined whether or not the measurement of BP ₁ and the minimum blood pressure value DBP ₁ is completed. If this judgment is denied, SA1
0 to SA12 are repeatedly executed. However, when this determination is affirmed, in the following SA13, the measured maximum blood pressure value SBP ₁ , minimum blood pressure value DBP ₁ ,
The average blood pressure value MBP ₁ , the pulse rate HR _1, and the measurement date and time are stored for each subject in the blood pressure value storage area 69 of the storage device 68, and the systolic blood pressure display 32, the diastolic blood pressure display 34, and the pulse rate. Each is displayed on the display 36.

Next, at SA14, the switching valve 42 is switched to the rapid exhaust state, so that the rapid exhaust pressure in the cuff 15 is started. Subsequently, in SA15, the systolic blood pressure value SBP _{1 and the} like are displayed and output on the recording paper by the printer 26. Then, when the subsequent SA16 is executed, the magnetic card 74 is sent out from the card insertion slot 28.

As described above, according to this embodiment, the first
Heartbeat cycle fluctuation signal LFC _RR and second heartbeat cycle fluctuation signal HF
Blood pressure measurement starts only when the intensity ratio with C _RR is less than or equal to a predetermined value X experimentally obtained in advance, that is, when the sympathetic nerve excitement level is low and the subject's tension is sufficiently relieved. Therefore, the blood pressure value with high reliability can be stably measured. Further, a first heartbeat cycle fluctuation signal LF described later.
Compared with the case where the tension of the person to be measured is determined only based on the strength of C _RR, the influence of individual differences such as the case where the signal strength of the entire fluctuation signal extracted from the fluctuation of the heartbeat cycle of the living body is large is more significant. Since this is eliminated, the determination accuracy of the predetermined value X preset for determining the tension of the person to be measured is improved.

Next, the main part of the control function of the electronic control unit 58 corresponding to the second invention in the automatic blood pressure measuring device 8 will be described based on the functional block diagram of FIG. In FIG. 7, the heart rate calculating means 88 continuously calculates the heart rate HR (bpm) of the living body for each heartbeat from Expression 1 based on the heartbeat cycle T _RR (msec) of the living body. The determination reference heart rate calculating means 90 statistically processes the heart rate within a preset constant section of the heart rate HR continuously calculated for each heart rate by the heart rate calculating means 88. For example, the moving average value of the heart rate HR for every 6 beats [= (HR ₁ + ...
HR ₆ ) / 6] to calculate the reference heart rate H
R _S is continuously calculated.

In the blood pressure measurement starting means 92, the deviation of the heart rate HR subsequently calculated by the heart rate calculation means 88 from the judgment reference heart rate HR _S calculated by the judgment reference heart rate calculation means 90 is within a predetermined range. Within the range of ± 1 bpm of the reference heart rate HR _AVE calculated based on the heart rate HR of the past 6 beats at a certain time point, for example, the seventh beat, 8 The blood pressure measurement of the living body by the blood pressure measuring means 80 is started based on the fact that the heart rate HR corresponding to the second beat has entered both the beats. If neither of the two beats falls within the predetermined range, the heart rate HR that did not start for the first time is newly set as the heart rate HR of the sixth beat, and the consecutive 6
The judgment reference heart rate HR _S is calculated in the same manner from the heart rate HR of the beat, and the range of ± 1 bpm is set in the same manner, and the heart rate HR of the two beats calculated subsequently falls within the predetermined range. Whether or not it is determined.

[0029]

[Expression 1] HR = (60000 / T _RR )

FIG. 8 is a flow chart for explaining a main part of the control operation of the electronic control unit 58 in the automatic blood pressure measuring device 8 corresponding to the functional block diagram of FIG. FIG.
In step SB1 (hereinafter, steps will be omitted), the card insertion opening 28 of the card reading device 72 will be described.
It is determined whether or not the magnetic card 74 has been inserted. If the determination in step SB1 is negative, this routine is ended, but if the determination is affirmative, the ID signal recorded on the magnetic card 74 in SB2 is read.

At SB3, it is determined whether the read ID signal is registered in the storage area of the storage device 68 in advance. If the determination at SB3 is negative, that is, if the ID signal recorded on the magnetic card 74 is unregistered, SB18 described below is executed and the magnetic card 74 is sent out from the card insertion port 28. However, if the determination at SB3 is affirmative, that is, if the ID signal recorded in the magnetic card 74 has been registered, at SB4 that follows, the time interval of the electrocardiographic induction waveform, for example, the time interval between R waves is detected. As a result, the heartbeat cycle T _RR (msec) of the living body is continuously detected for each heartbeat.

Next, the SB corresponding to the heart rate calculation means 88
5, the heartbeat cycle T of the living body _RRBased on the above
From Equation 1, the heart rate HR (bpm) of the living body is continuously calculated for each heartbeat.
Calculated continuously. Then, at SB6, the heart rate HR
However, it is determined whether or not, for example, 6 or more beats have been calculated.
If this judgment is denied, SB4 to SB6 are repeated.
However, if this judgment is affirmed, the judgment is returned.
In SB7 corresponding to the disconnection reference heart rate calculation means 90,
For example, it is judged by calculating the moving average value for 6 beats
Reference heart rate HR_SIs required. Calculate the moving average value
For the heart rate HR for 6 beats used to
Every time SB7 is repeatedly executed, its execution time is always
The latest consecutive 6-beat heart rate HR in
You.

Next, at SB8, it is determined whether or not the heart rate HR corresponding to the seventh beat has been calculated. When this judgment is denied, SB4 to SB8 are repeatedly executed, but when this judgment is affirmed, SB9 and SB10 corresponding to the subsequent blood pressure measurement starting means 92 are executed. First, in SB9, the judgment reference heart rate HR _S ±
It is determined whether or not the heart rate HR corresponding to the 7th beat is within the range of 1 bpm. If this determination is denied, SB4 to SB9 are repeatedly executed.

However, if this judgment is affirmed,
In subsequent SB10, it is determined whether or not the determination in SB9 is affirmative twice in a row. If this determination is negative, SB4 to SB10 are repeatedly executed, but if this determination is positive, the subsequent blood pressure measurement operation at SB11 and below is started. First, in SB11, the switching valve 42 is switched to the pressure supply state and the air pump 44 is driven to increase the cuff pressure P to a preset target cuff pressure P ₁ (for example, a pressure of about 180 mmHg), and then the air pump. 44 is stopped. Then S
At B12, the switching valve 42 is switched to the gradual exhaust state, so that the gradual pressure reduction in the cuff 15 is started.

Next, in SB13, the pulse wave signal SM
₁ is read, and it is determined whether or not one pulse wave is detected. If this determination is negative, SB13 is repeatedly executed, but if affirmative, SB13.
The blood pressure measurement routine of SB14 corresponding to 0 is executed. In this blood pressure measurement routine, the systolic blood pressure value SBP ₁ , according to the well-known oscillometric blood pressure value determination algorithm, based on the change in the amplitude of the cuff pulse wave that is sequentially detected in the process of gradually decreasing the cuff pressure P, The minimum blood pressure value DBP ₁ and the average blood pressure value MBP ₁ are determined, and the pulse rate PR is determined based on the generation interval of the cuff pulse wave.

Next, at SB15, the systolic blood pressure value SB
It is determined whether the measurement of P ₁ and the minimum blood pressure value DBP ₁ is completed. If this determination is denied, SB13
Through SB15 are repeatedly executed. However, when this determination is affirmed, in the subsequent SB16, the measured maximum blood pressure value SBP ₁ , the minimum blood pressure value DBP ₁ , the average blood pressure value MBP ₁ , the pulse rate PR and the measurement date and time are stored in the storage device 68. Is stored in the blood pressure value storage area 69 of each subject, and the systolic blood pressure indicator 32 and the diastolic blood pressure indicator 3 are stored.
4, displayed on the pulse rate display 36, respectively.

Next, at SB17, the switching valve 42 is switched to the quick exhaust state, so that the rapid exhaust pressure in the cuff 15 is started. Subsequently, in SB18, the systolic blood pressure value SBP _{1 and the} like are displayed and output by the printer 26 on the recording paper. Then, by executing the subsequent SB 19, the magnetic card 74 is sent out from the card insertion slot 28.

As described above, according to this embodiment, the determination is made by SB7 corresponding to the reference heart rate calculation means 90 from the heart rate HR of the living body continuously calculated by SB5 corresponding to the heart rate calculation means 88. The reference heart rate HR _S is continuously calculated, and the judgment reference heart rate HR _S calculated at a certain time
Heart rate HR calculated within the range of ± 1 bpm of
When the operation of entering is repeated twice, the blood pressure measurement by SB14 corresponding to the blood pressure measuring means 80 is started by SB9 through SB10 corresponding to the blood pressure measurement starting means 92. Therefore, when the deviation of the heart rate HR of the living body from the judgment reference heart rate HR _S falls within a predetermined range, that is, the excitability of the sympathetic nerve is low and the heartbeat of the subject is sufficiently stable. Since the blood pressure measurement is started only when the blood pressure is high, a highly reliable blood pressure value can be measured stably.

Although various embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-mentioned embodiment, the SA6 corresponding to the heartbeat cycle fluctuation signal extracting means 84 outputs only the first heartbeat cycle fluctuation signal LFC _RR, and the SA7 corresponding to the blood pressure measurement starting means 86 operates as follows. When the intensity of the first heartbeat cycle fluctuation signal LFC _RR becomes equal to or lower than a preset predetermined value Y, the blood pressure measurement of the living body by SA11 corresponding to the blood pressure measurement means 80 may be started. Absent. The predetermined value Y is a constant value calculated when the subject's tension is sufficiently released,
It is calculated experimentally in advance. With this, the blood pressure measurement is started only when the intensity of the first heartbeat cycle fluctuation signal LFC _RR is equal to or less than the predetermined value Y, that is, when the tension of the subject is sufficiently released. Therefore, the blood pressure value with high reliability is stably measured.

Further, in the above-described embodiment, the blood pressure measurement by the oscillometric method is performed at SA11 and SB14 corresponding to the blood pressure measuring means 80, but the blood pressure measurement by the Korotkoff sound method may be performed separately. It does not matter, and another blood pressure measuring method may be adopted.

Further, in the above-mentioned embodiment, the predetermined values X and Y for judging the degree of tension of the person to be measured are preset to constant values which have been experimentally determined. It may be configured to sequentially set for each individual by a switch or the like provided in the.

Further, in the above-mentioned embodiment, in SB7 corresponding to the judgment reference heart rate calculating means 90, the judgment reference heart rate HR _S is obtained by calculating the moving average value of the heart rate HR of 6 beats. However, for example, heart rate H
The determination reference heart rate HR _S may be obtained from the regression line of R.

Further, in the above-described embodiment, the cuff pulse wave detected in the cuff 15 is generated in each cycle from the predetermined portion generated in each cycle of the electrocardiographic waveform detected by the electrocardiographic induction device 70. By calculating the time difference Td to the predetermined region, the propagation velocity of the pulse wave propagating in the artery of the measurement subject can be measured from the predetermined relationship based on the time difference Td. May be. By doing so, there is an advantage that the health condition of the person to be measured can be grasped more multilaterally.

Further, in the above-mentioned embodiment, the automatic blood pressure measuring device 8 with the electrocardiographically induced waveform detection function is simply installed by installing the electrode 18 on the armrest integrally provided in the main body. However, it is not necessary to be limited to such a structure. For example, a cord that is made to adsorb a sucker-shaped electrode 18 to a part of a living body and is extended from the electrode 18 is a main body. Needless to say, it may be configured so that the electrocardiographically induced waveform is detected by being connected to.

Further, in the above-mentioned embodiment, it is judged in SA5 whether or not the heartbeat period T _RR is detected for a predetermined number of beats experimentally calculated in advance or more, but the number of beats is 1 beat. But it doesn't matter. That is, SA5 can be omitted.

The present invention can be modified in various ways without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating an automatic blood pressure measurement device with an electrocardiographic induction waveform detection function according to an embodiment of the present invention.

FIG. 2 is a block diagram illustrating a circuit configuration of the embodiment of FIG. 1;

FIG. 3 is a functional block diagram illustrating a main part of a control function corresponding to the first invention of the electronic control unit 58 of the embodiment of FIG. 1;

4 is a diagram exemplifying a fluctuation (variation) of a heartbeat cycle T _RR detected from a time interval between R waves of an electrocardiographic induction waveform detected by the electrocardiographic induction device of the embodiment of FIG.

FIG. 5 is a first diagram extracted from the fluctuation of the heartbeat cycle T _RR .
Heartbeat cycle fluctuation signal LFC _RR , second heartbeat cycle fluctuation signal HF
C _RR, and 0Hz frequency components is a diagram illustrating a (direct current component) DC _RR.

FIG. 6 is a flowchart illustrating a main part of control operation of the electronic control unit 58 corresponding to the functional block diagram of FIG.

FIG. 7 is a functional block diagram illustrating a main part of a control function of the electronic control unit 58 of the embodiment of FIG. 1 corresponding to the second aspect of the invention.

8 is a flowchart illustrating a main part of a control operation of the electronic control device 58 corresponding to the functional block diagram of FIG. 7.

[Explanation of symbols]

 10: Automatic blood pressure measuring device with electrocardiographic induction waveform detection function 15: Cuff 18: Electrode 70: Electrocardiographic induction device 80: Blood pressure measuring means 82: Heartbeat cycle detecting means 84: Heartbeat cycle fluctuation signal extracting means 86: Blood pressure measurement starting means 88: Heart rate calculation means 90: Judgment reference heart rate calculation means 92: Blood pressure measurement start means

Claims (3)

[Claims] 1. An automatic blood pressure measuring device comprising blood pressure measuring means for measuring a blood pressure value of a living body, comprising: a heartbeat cycle detecting means for continuously detecting a heartbeat cycle of the living body; Heartbeat cycle fluctuation signal extracting means for extracting a first heartbeat cycle fluctuation signal, which is a predetermined frequency component lower than the respiratory frequency of the living body, from the fluctuation of the detected heartbeat cycle of the living body, and the first heartbeat cycle fluctuation signal. Blood pressure measurement starting means for starting the blood pressure measurement of the living body by the blood pressure measuring means based on the strength of the automatic blood pressure measurement device. 2. The heartbeat cycle fluctuation signal extraction means, in addition to the first heartbeat cycle fluctuation signal, respiration of the living body from fluctuations of the heartbeat cycle of the living body continuously detected by the heartbeat cycle detection means. The second heartbeat cycle fluctuation signal, which is a predetermined frequency component substantially equal to the frequency, is also extracted, and the blood pressure measurement starting means and the first heartbeat cycle fluctuation signal extracted by the heartbeat cycle fluctuation signal extraction means and the Second
The automatic blood pressure measurement device according to claim 1, wherein the blood pressure measurement of the living body is started by the blood pressure measurement means based on an intensity ratio with a heartbeat cycle fluctuation signal. 3. An automatic blood pressure measuring device comprising blood pressure measuring means for measuring a blood pressure value of a living body, wherein a heart rate calculation for continuously calculating the heart rate of the living body from a predetermined relationship based on the heartbeat cycle of the living body. And a judgment reference heartbeat for calculating the judgment reference heartbeat by statistically processing the heartbeats within a preset constant section among the heartbeats of the living body continuously calculated by the heartbeat calculation means. The blood pressure measurement when the deviation of the heart rate calculated by the heart rate calculation means from the reference heart rate calculated by the heart rate calculation means falls within a predetermined range. Blood pressure measurement starting means for starting the blood pressure measurement of the living body by the means.