JP2000060809A - Bloodless sphygmomanometer and bloodless sphygmomanometry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure exact blood pressure values without imparting burdens to subjects by measuring the blood pressure values at the optimum cuff pressure reduction rates according to the cardiac rates of the respective subjects. SOLUTION: This bloodless sphygmomanometer has a cuff 10 for compressing the artery and a sphygmomanometeric means 20 for changing the cuff pressure by reducing the pressure of the cuff 10 under and at pressurization and a prescribed rate and detecting the artery phenomenon in the pressure reduction process of the cuff pressure and decides the prescribed blood pressure value from the data detected in the pressure reduction process of the cuff pressure. The instrument described above is constituted to have a memory 40 which detects the cardiac rate by the cuff pressure detecting section 22 of the sphygmomanometric means 20 and stores the detected cardiac rate data and a microprocessor 30 which calculates the optimum cuff pressure reduction rate in accordance with the cardiac rate data stored in the memory 40 and controls the cuff pressure reduction rate in the cuff pressure regulating section 21 of the sphygmomanometric means 20 by the optimum cuff pressure reduction rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-invasive blood pressure measuring apparatus and a non-invasive blood pressure measuring apparatus for non-invasively determining a predetermined blood pressure value by detecting a pulsation phenomenon in a depressurizing process of a cuff pressure compressing an artery. Regarding the measurement method, in particular, by making it possible to change the depressurization rate of the cuff pressure corresponding to different heart rates depending on the subject, the blood pressure value at the optimal cuff pressure decompression rate according to the heart rate of each subject. The present invention relates to a non-invasive blood pressure measuring device and a non-invasive blood pressure measuring method capable of measuring blood pressure and measuring an accurate blood pressure value without imposing a burden on a subject.

[0002]

2. Description of the Related Art Generally, there is known a non-invasive blood pressure measuring method for indirectly measuring the blood pressure of a patient or an examinee from outside the body. Here, as a non-invasive blood pressure measuring method of this type, blood pressure measurement by an oscillometric method is generally used.

The blood pressure measurement by the oscillometric method is to pressurize an artery of a subject with a cuff to stop blood circulation, and gradually depressurize the cuff to circulate blood to depressurize the blood. By detecting the pulse wave vibration transmitted to the cuff in the process with a pressure sensor, a predetermined blood pressure value (maximum blood pressure, minimum blood pressure, average blood pressure) is measured and determined (see FIG. 3). Such an oscillometric blood pressure measuring device has little effect on the body, the structure of the device used for measurement is simple, and the measurement work can be performed easily. Therefore, it is widely used not only in hospitals but also in general households today. is doing.

[0004]

However, in the conventional blood pressure measuring device, the cuff pressure depressurizing speed (speed from P0 to P1 shown in FIG. 3) performed via the solenoid valve is a standard certain heart rate. (For example, 60 bpm), and based on the estimated heart rate, for example, 2 to 3 mmH per heartbeat.
The cuff pressure was fixed at a decompression rate such that the cuff pressure was decompressed step by step, and it was always fixed at a constant cuff pressure decompression rate regardless of the actual heart rate of the subject.

Therefore, the following problems have occurred depending on the heart rate of the subject. For example, if the subject's heart rate is lower than the expected heart rate, the cuff is 1
It will be decompressed by 2-3 mmHg or more per heartbeat,
There are few amplitude sequences obtained in the depressurization process, and the number of detected samples is too small, which may cause an error and prevent accurate measurement.

On the contrary, when the heart rate of the examinee is higher than the expected heart rate, many amplitude sequences are obtained in the depressurization process, so that even if the cuff pressure is depressurized faster than the normal speed, it is constant. Since it is possible to secure the above sampling number, it is desirable to shorten the measurement time in consideration of the burden on the person to be inspected, but it was not possible to shorten the measurement time because the pressure reduction rate was fixed.

In Japanese Patent Laid-Open No. 63-281622, the cuff pressurization time is changed according to the heart rate of the examinee so that the cuff pressurization time is minimum. An "electronic non-invasive blood pressure monitor" that is controlled by time has been proposed. However, the sphygmomanometer described in this publication is to measure blood pressure in the process of pressurizing the cuff, and as described above, the problem of the conventional non-invasive blood pressure measuring device that performs blood pressure measurement in the process of depressurizing the cuff is solved. It didn't go away.

The present invention has been proposed in order to solve the problems of the prior art as described above, and it is possible to change the depressurization speed of the cuff pressure according to the heart rate that is different depending on the person to be inspected. A non-invasive blood pressure measuring device and a non-invasive blood pressure measuring device for measuring an accurate blood pressure value without imposing a burden on the subject by measuring the blood pressure value at an optimal cuff pressure decompression rate according to the heart rate of each subject. The purpose is to provide an open blood pressure measuring method.

[0009]

In order to achieve the above object, a non-invasive blood pressure measuring apparatus according to claim 1 of the present invention comprises a cuff for compressing an artery and pressurizing and depressurizing the cuff at a predetermined speed. It is a non-invasive blood pressure measurement device that includes a blood pressure measurement unit that changes the cuff pressure and detects a pulsation phenomenon in the depressurization process of the cuff pressure, and determines a predetermined blood pressure value from the detection data in the depressurization process of the cuff pressure. Then, the heart rate detecting means for detecting the heart rate, the storing means for storing the heart rate data detected by the heart rate detecting means, and the optimum cuff pressure decompression rate based on the heart rate data stored in the storing means. And a control means for controlling the cuff pressure reducing rate of the blood pressure measuring means by the optimum cuff pressure reducing rate,
Is provided.

According to the non-invasive blood pressure measuring apparatus of the present invention having such a configuration, the heart rate of the subject is detected by the heart rate detecting means during blood pressure measurement, and the heart rate data is stored in the storing means. It Then, the cuff pressure decompression rate most suitable for the subject (optimum cuff pressure decompression rate) is calculated by the control means from the heart rate stored in the storage means, and the blood pressure measurement means is controlled based on this calculated speed. Then, the next measurement is performed.

As a result, when the blood pressure is continuously measured at least twice for the same subject, the optimal cuff pressure decompression rate based on the actual heart rate data of the subject obtained in the previous measurement. Since the blood pressure is measured by, for example, when the heart rate is lower than the standard heart rate estimated in advance, the decompression rate can be slowed down to secure the required sampling rate and perform accurate blood pressure measurement. Yes, on the contrary,
When the heart rate is higher than the assumed heart rate, the decompression rate can be increased to shorten the measurement time and reduce the burden on the person to be inspected due to an unnecessarily long inspection time.

According to a second aspect of the present invention, the blood pressure measuring means includes the heart rate detecting means. Particularly, in the third aspect, the blood pressure measuring means includes a pressure sensor.

According to the non-invasive blood pressure measuring device of the present invention having such a configuration, the blood pressure can be simply measured by the oscillometric method using the pressure sensor, and at the same time, the pressure sensor vibrates when the cuff pressure is reduced. The heart rate can be measured from the heart rate, and the heart rate of the subject can be detected only by a simple blood pressure measuring means equipped with a pressure sensor, and a device, means, etc. for separately detecting the heart rate are provided. Without this, the blood pressure measurement device of the present invention can be realized with only a simple structure.

According to a fourth aspect of the present invention, the heart rate detecting means automatically operates together with the blood pressure measuring means at regular intervals to continuously detect the heart rate.

According to the non-invasive blood pressure measuring device of the present invention having such a configuration, in the device for measuring blood pressure by setting the blood pressure measuring means in the automatic measurement mode, or automatically after a certain period of time, or By continuously measuring the blood pressure value over time, the heart rate can also be detected continuously, and the accurate blood pressure value can be measured by the optimal cuff pressure reduction rate based on the heart rate at the time of the previous measurement.

Further, in the present invention, the heart rate detecting means is operated by an external operation together with the blood pressure measuring means to continuously detect the heart rate.

According to the non-invasive blood pressure measuring device of the present invention having such a configuration, in the device for measuring the blood pressure by setting the blood pressure measuring means in the manual measurement mode, any operation of the examiner or the examinee can be performed. By continuously measuring the blood pressure value by, the heart rate can also be detected continuously, and the accurate blood pressure value can be measured by the optimum cuff pressure depressurization rate based on the heart rate at the time of the previous measurement.

On the other hand, in the non-invasive blood pressure measuring method according to the sixth aspect, the cuff is pressurized to compress the artery, the cuff pressure of the cuff is reduced at a predetermined rate, and the pulsation in the process of reducing the cuff pressure. A non-invasive blood pressure measuring method for detecting and determining a predetermined blood pressure value by detecting a phenomenon, wherein the heart rate is detected in the depressurization process of the cuff pressure, and the detected heart rate is stored, and the memory is stored. An optimal cuff pressure decompression rate of the cuff is calculated based on the determined heart rate, and the decompression rate of the cuff pressure is changed based on the optimal cuff pressure decompression rate to perform the next measurement. In particular, claim 7 is a method for determining a predetermined blood pressure value by continuously performing the measuring method according to claim 6 at least twice or more.

According to the non-invasive blood pressure measuring apparatus of the present invention having such a method, the heart rate of the subject is detected during blood pressure measurement, the heart rate data is stored, and the stored heart rate is stored. From the data, the optimum cuff pressure decompression rate most suitable for the subject is calculated, and the next measurement is performed at the optimum cuff pressure decompression rate.

Thus, by measuring the blood pressure continuously at least twice for the same subject, the blood pressure can be measured by the optimal cuff pressure reduction rate based on the heart rate obtained in the previous measurement. Accurate blood pressure measurement is possible even if the heart rate is lower than the standard heart rate assumed in advance.If the heart rate is higher than the expected heart rate, the measurement time will be shortened to reduce the burden on the subject. Can be reduced.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the non-invasive blood pressure measuring device of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the non-invasive blood pressure measuring device of the present invention. FIG. 2 is a flowchart showing a blood pressure measuring method by the blood pressure measuring device of the present embodiment shown in FIG. FIG. 3 is an explanatory diagram showing the relationship between the cuff pressure reduction rate and the heart rate in the non-invasive blood pressure measurement device. 4 and 5 are explanatory diagrams showing the relationship between the cuff pressure reduction rate and the heart rate measured by the blood pressure measurement device of the present embodiment, and FIG.
When the heart rate is lower than the standard heart rate, FIG.
This is when the heart rate is higher than the standard heart rate.

As shown in FIG. 1, the non-invasive blood pressure measuring apparatus of this embodiment has a cuff 10 for compressing an artery and a cuff 1.
Blood pressure measurement to measure and determine a predetermined blood pressure value from the cuff pressure and pulse wave vibration while detecting the pulsation phenomenon in the pressure reduction process of the cuff pressure while changing the cuff pressure by pressurizing and depressurizing 1 at a predetermined speed. Means 20 are provided. The blood pressure measuring means 20 includes a microprocessor 30 serving as control means, a memory 40 serving as storage means, and a keyboard 50 serving as setting input means.
Also, a display 60 serving as display means is connected, and these respective units are mutually connected via a bus.

As will be described later, the blood pressure measuring means 20 is a device for performing non-invasive blood pressure measurement based on an instruction from the microprocessor 30, and pressurizes the cuff 10 and depressurizes it at a predetermined speed. An adjustment unit 21 and a cuff pressure detection unit 22 that detects a pulsation phenomenon (changes in pulsation pressure and blood flow) from changes in the cuff pressure during the depressurization process of the cuff pressure are provided and connected to the cuff 10.

Here, the blood pressure measuring means 20 of the present embodiment
Has almost the same configuration as the blood pressure measuring means provided in the conventional non-invasive blood pressure measuring device by the oscillometric method, and uses a pressure sensor as the cuff pressure detecting unit 22. Then, the pressure sensor constituting the cuff pressure detection unit 22 detects the change in the cuff pressure and the pulse wave vibration during the cuff depressurization process, and at the same time, detects the heart rate of the subject ( (See FIG. 3). By thus configuring the cuff pressure detection unit 22 with a pressure sensor, simple non-invasive blood pressure measurement by the oscillometric method using a pressure sensor similar to the conventional one can be performed, and the cuff pressure reduction can be performed by the pressure sensor. A heart rate detecting means for simultaneously measuring the heart rate from the cuff pressure at that time can be configured.

In the blood pressure measuring means 20, the cuff pressure adjusting section 21 is controlled by the microprocessor 30, and the cuff pressure depressurizing rate (standard cuff pressure depressurizing rate) based on the standard heart rate similar to the above-mentioned conventional apparatus. In addition to decompressing the cuff 10, the cuff 10 is decompressed at an optimal cuff pressure reduction rate (optimum cuff pressure reduction rate) according to the heart rate of the subject.

Generally, the decompression speed of the cuff in the non-invasive blood pressure measurement is 2 to 3 m per heartbeat of the patient and the subject.
Although it is said that it is desirable to reduce the pressure by mHg, the heart rate of the examinee varies and differs depending on the person, the physical condition, the medical condition, and the like. Therefore,
In the blood pressure measurement device according to the present embodiment, in addition to the general standard cuff pressure depressurization rate that has been conventionally adopted, in the blood pressure measurement after the second time, the cuff pressure detection unit 2 at the time of the previous blood pressure measurement.
2-3m per heartbeat based on the heart rate detected in 2
An optimal cuff pressure decompression rate for decompressing in mHg is calculated to control the decompression rate of the cuff pressure adjusting unit 21.

Specifically, when the blood pressure measurement by the present apparatus is the first time, the microprocessor 3 is used as described later.
In accordance with an instruction from 0, the cuff 10 is decompressed at a preset standard cuff pressure decompression rate and blood pressure is measured.
When the blood pressure measurement is continuously performed twice or more, the cuff pressure is reduced at the optimum cuff pressure decompression rate calculated based on the actual heart rate data detected in the previous blood pressure measurement and written in the memory 40. The pressure of 10 is reduced and blood pressure is measured.

For example, as shown in FIG. 4, when the heart rate of the subject is lower than the standard heart rate, the cuff pressure depressurization rate (the rate from P0 to P1 shown in FIG. 4) becomes slow, On the contrary, as shown in FIG. 5, when the heart rate is higher than the assumed heart rate, the cuff pressure depressurization speed (speed from P0 to P1 shown in FIG. 5) is controlled to be high. This allows
When measuring blood pressure at least twice consecutively for the same subject, blood pressure can be measured by the optimal cuff pressure reduction rate based on the actual heart rate of each subject obtained in the previous measurement. Will be done.

The microprocessor 30 comprises an arithmetic unit 31, a setting unit 32, and a writing / reading unit 33, and controls the drive of the blood pressure measuring means 20 and each unit of the apparatus. The arithmetic unit 31 reads out the detection data of the cuff pressure written in the memory 40 from the blood pressure measuring means 20 via the writing / reading unit 33 to obtain a predetermined blood pressure value (maximum blood pressure, minimum blood pressure, average blood pressure).
And the memory 4 as described above.
The heart rate data written in 0 is read out, and the optimum cuff pressure decompression rate most suitable for the heart rate is calculated and determined.
Here, the optimal cuff pressure decompression rate calculated by the calculation unit 31 is, as described above, 2 to 2 per heartbeat based on the actual heart rate of the subject detected by the cuff pressure detection unit 22 during blood pressure measurement. The rate at which the cuff pressure is reduced by 3 mmHg is calculated as the optimal cuff pressure reduction rate.

Then, the blood pressure measuring means 20 is drive-controlled by the arithmetic unit 31, and the blood pressure is measured at the above-mentioned standard cuff pressure reducing rate and optimum cuff pressure reducing rate. Also,
The calculation result of the calculation unit 31 is written in the memory 40 and displayed on the display 60 as a predetermined blood pressure value.

Further, the arithmetic unit 31 determines whether the measurement mode is the automatic measurement mode or the manual measurement mode, and when the measurement mode is manual, determines whether or not the measurement is in the continuous measurement state. It has become. Here, the manual measurement mode is a mode in which the blood pressure is measured once by a start operation from the keyboard 50 of the inspector or the subject during the blood pressure measurement, and the automatic measurement mode is a mode in which once the measurement is started, In this mode, blood pressure measurement is repeated automatically at regular intervals or without time.
Further, the continuous measurement state means a state in which the measurement is continuously performed within a fixed interval, for example, within 10 seconds in the manual measurement mode.

The setting section 32 is used to turn ON / OFF various controls set by the keyboard 50, a manual measurement mode,
The automatic measurement mode is set in the memory 40 via the writing / reading unit 33.
To store. Here, in the present embodiment, the manual measurement mode and the automatic measurement mode described above are set and stored via the setting unit 32, so that the measurement mode can be arbitrarily switched by the operation of the keyboard 50. . By making the measurement modes switchable in this manner, the measurement modes can be selectively set according to the environment at the time of blood pressure measurement, the health condition of the subject, and the like. Then, in the present embodiment, as will be described later, in any measurement mode, if blood pressure is continuously measured, the optimal cuff pressure decompression rate based on the heart rate detected during the previous blood pressure measurement is used. Blood pressure is measured.

The memory 40 includes a system program of the microprocessor 30, a measurement mode, a standard cuff pressure decompression rate, predetermined data such as the cuff pressure and heart rate measured by the non-invasive blood pressure measuring means 20, and the arithmetic unit 31 described above. The storage means stores the calculation result of The keyboard 50 is necessary for the present blood pressure measurement device such as ON / OFF of various controls of the non-invasive blood pressure measurement means 20 to the microprocessor 30 (for example, start of measurement), setting of the above-mentioned manual measurement mode and automatic measurement mode, and the like. It is a setting input means (switch) for instructing and setting. The display 60 is composed of a CRT, a liquid crystal display, an LED display, etc., and externally displays set values and blood pressure measurement results (maximum blood pressure, minimum blood pressure, average blood pressure), etc.
It is a display means provided.

Next, the operation of the non-invasive blood pressure measuring device of this embodiment having such a configuration will be described with reference to FIG. First, the keyboard 50 is used to input settings required for non-invasive blood pressure measurement. That is, the ON / OFF of the control of the non-invasive blood pressure measuring means 20 and the different measurement modes (automatic mode or manual mode) are set (step 1).

When the measurement start is instructed from the keyboard 50 in step 1, the microprocessor 30 determines whether or not the measurement mode is the automatic measurement mode and whether or not the measurement mode is the continuous measurement state even if the measurement mode is manual. (Step 2). When it is determined that the measurement is in the automatic measurement mode or the continuous measurement state, the microprocessor 30 determines whether or not the measurement is the second or later measurement (step 3), and when the second or subsequent measurement is determined, the calculation is performed. In the part 31, the memory 4
From the heart rate written in 0 at the time of the previous measurement, the cuff pressure decompression rate most suitable for the heart rate is calculated (step 4). Then, this calculation result is output from the calculation unit 31 to the non-invasive blood pressure measuring means 20 and set (step 5), and the non-invasive blood pressure measurement is executed at the optimum cuff depressurization rate (see FIGS. 4 and 5) ( Step 6), at the same time, the heart rate is detected. The heart rate obtained by this measurement is stored and stored in the memory 40 (step 7).

On the other hand, in step 3, the measurement is 1
If it is judged that it is the first time, the preset standard cuff pressure reducing rate is set (step 8), and the blood pressure is measured at the standard cuff pressure reducing rate (step 6). Then, the heart rate detected during the measurement at the standard cuff pressure reduction rate is written in the memory (step 7), and the optimum cuff pressure reduction rate is calculated at the next measurement. After that, when the measurement is not performed (step 9), the measurement ends. On the other hand, when the measurement is further continuously performed (step 9), the measurement mode is determined in step 2 and the above-described measurement is performed again.

As described above, according to the non-invasive blood pressure measuring device and the non-invasive blood measuring method of the present embodiment, the heart rate of the subject is detected during blood pressure measurement, and the heart rate data is stored in advance.
From the stored heart rate data, the cuff pressure decompression rate most suitable for the subject is calculated, and the next measurement is performed at the optimum cuff pressure decompression rate.

As a result, blood pressure can be measured at an optimum cuff pressure reduction rate based on the heart rate obtained in the previous measurement by continuously measuring blood pressure at least twice for the same subject. Become. For example, if your heart rate is lower than your expected standard heart rate,
The decompression rate can be slowed down to secure the required number of samplings, allowing accurate blood pressure measurement. On the other hand, when the heart rate is higher than the assumed heart rate, the measurement time can be shortened to reduce the burden on the subject due to an unnecessarily long examination time.

The present invention is not limited to the above-mentioned embodiment, and within the scope of the gist of the present invention,
Various modifications can be made. For example, in the above-described embodiment, the heart rate is simultaneously detected by the cuff pressure detection unit 22 during blood pressure measurement. However, the heart rate is detected by another detecting means such as an electrocardiogram and the optimum cuff is detected based on the data. Blood pressure can also be measured by calculating the pressure reduction rate.

Further, in the above-described embodiment, the pressure sensor is used as the non-invasive blood pressure measuring means 20, but the blood pressure may be measured by means other than this. That is, the present invention uses a pressure sensor if the measurement method is a cuff method for measuring blood pressure by detecting a pulsation phenomenon at an optimal cuff pressure decompression rate according to the heart rate of the subject in the cuff pressure decompression process. It can be applied not only to the oscillometric method but also to noninvasive blood pressure measurement by a microphone method or an ultrasonic Doppler method.

[0041]

As described above, according to the non-invasive blood pressure measuring device and the non-invasive blood pressure measuring method of the present invention, it is possible to change the depressurizing speed of the cuff pressure according to the different heart rate depending on the examinee. By doing so, the blood pressure value can be measured at an optimal cuff pressure reduction rate according to the heart rate of each subject, and the accurate blood pressure value can be measured without imposing a burden on the subject.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a non-invasive blood pressure measuring device of the present invention.

FIG. 2 is a flowchart showing a blood pressure measuring method by the blood pressure measuring device of the present embodiment shown in FIG.

FIG. 3 is an explanatory diagram showing a relationship between a cuff pressure reduction rate and a heart rate in the non-invasive blood pressure measuring device.

FIG. 4 is an explanatory diagram showing the relationship between the cuff pressure reduction rate and the heart rate measured by the blood pressure measurement device according to one embodiment of the present invention, in the case where the heart rate is lower than the standard heart rate.

FIG. 5 is an explanatory diagram showing the relationship between the cuff pressure reduction rate and the heart rate measured by the blood pressure measurement device according to one embodiment of the present invention, in the case where the heart rate is higher than the standard heart rate.

[Explanation of symbols]

10 cuffs 20 Non-invasive blood pressure measuring means 21 Cuff pressure adjustment unit 22 Cuff pressure detector 30 microprocessor (control means) 31 Operation part 32 setting section 33 writing / reading unit 40 memory (storage means) 50 keyboard (setting input means) 60 display (display means)

Claims (7)

[Claims] 1. A cuff for compressing an artery, and a blood pressure measuring unit for changing the cuff pressure by pressurizing the cuff and depressurizing the cuff at a predetermined speed, and detecting a pulsation phenomenon in the depressurizing process of the cuff pressure. A non-invasive blood pressure measuring device for determining a predetermined blood pressure value from the detection data in the depressurization process of cuff pressure, comprising heart rate detecting means for detecting a heart rate, and heart rate data detected by the heart rate detecting means. Storage means for storing, and a control means for calculating the optimum cuff pressure reduction rate based on the heart rate data stored in the storage means, and controlling the cuff pressure reduction rate of the blood pressure measurement means by the optimum cuff pressure reduction rate. And a non-invasive blood pressure measuring device. 2. The non-invasive blood pressure measuring device according to claim 1, wherein the blood pressure measuring means includes the heart rate detecting means. 3. The non-invasive blood pressure measuring device according to claim 1, wherein the blood pressure measuring means includes a pressure sensor. 4. The non-invasive blood pressure measuring device according to claim 1, wherein the heart rate detecting means automatically operates at a constant interval together with the blood pressure measuring means to continuously detect a heart rate. . 5. The non-invasive blood pressure measurement according to claim 1, 2, 3 or 4, wherein the heart rate detecting means operates together with the blood pressure measuring means by an external operation to continuously detect a heart rate. apparatus. 6. A cuff pressure is applied to pressurize an artery, the cuff pressure of the cuff is reduced at a predetermined rate, and a pulsation phenomenon in the process of reducing the cuff pressure is detected to determine a predetermined blood pressure value. An invasive blood pressure measuring method, wherein a heart rate is detected in the process of reducing the cuff pressure, and the detected heart rate is stored, and the optimum cuff pressure reduction of the cuff is performed based on the stored heart rate. A non-invasive blood pressure measuring method comprising calculating a speed, and changing the depressurizing speed of the cuff pressure based on the optimum depressurizing speed of the cuff pressure to perform the next measurement. 7. A non-invasive blood pressure measuring method, wherein the predetermined blood pressure value is determined by continuously performing the measuring method according to claim 6 at least twice or more.