JPS6397145A - Electronic hemomanometer - 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 (a) Field of Industrial Application This invention relates to an electronic blood pressure monitor that can automatically set a pressurization target value.

(B) Conventional technology In general, with an electronic blood pressure monitor, a cuff is wrapped around the upper arm, the cuff is pressurized to compress the brachial artery, and after the cuff pressure is increased above the systolic blood pressure, the pressure is reduced by slow evacuation. In addition to detecting the cuff pressure, the Korotkoff sound and the pulse wave amplitude superimposed on the cuff pressure are detected, and the generation and disappearance points of the Korotkoff sound are extracted by electrical processing, or a predetermined algorithm 1, etc. is applied to the pulse wave amplitude sequence.
is applied to determine the systolic and diastolic blood pressure. Some electronic blood pressure monitors of this type are equipped with a pressure setting device and are configured to automatically increase pressure using a pump or the like to a target value set by the pressure setting device. This pressurization setting device sets the pressurization target value in several stages (for example, 140, ] 70.200.240 mmH
g), the measurer can select and set the pressurization target value most suitable for his or her own blood pressure measurement in advance.
Select and set with this pressurization setting device, turn on the measurement switch, and start pressurization.

(c) Problems to be solved by the invention In the above-mentioned conventional electronic blood pressure monitor, the pressurization target value is fixedly set using the pressurization setting device. This may result in setting a high target value, resulting in excessive pressurization and causing unnecessary pain to the patient, or in setting a target value lower than the initial systolic blood pressure, resulting in Wll + undetermined and re-measurement. There were often inconveniences in which there was nothing to do.

In view of the above, an object of the present invention is to provide an electronic sphygmomanometer that can automatically set an appropriate pressurization level according to the current blood pressure value of sweat to be measured.

(d) Means and action for solving the problem Generally, the cuff is pressurized above the systolic blood pressure, then the cuff pressure is reduced, the amplitude of the pulse wave component superimposed on the cuff pressure is extracted, and the cuff is The relationship between pressure and pulse wave amplitude sequence is shown in Figure 10. It is known that the cuff pressure corresponding to the maximum point of pulse wave amplitude corresponds to the average blood pressure, and this average 10 [
It has been clinically confirmed that there is a correlation between pressure (MEAN) and systolic blood pressure (SYS) as shown in Figure 9. For example, if the mean blood pressure is PMEAN%, the systolic blood pressure is P, and 7 degrees. , when the cuff pressure corresponding to the maximum pulse wave amplitude, that is, the mean blood pressure P□□ is extracted, P 5vs= (P□□−1
, 8) From 10.6, systolic blood pressure P, 7. is calculated.

From the above, if we look at the change in pulse wave amplitude during the cuff pressurization process [Figure 10 (assuming a case where the cuff pressure changes from t2 to t in al)], we can see that the pulse wave amplitude is in an increasing state. , which means that the cuff has not yet been pressurized above the average blood pressure, and when the pulse wave amplitude decreases, it means that the cuff has been pressurized above the average blood pressure.Therefore, during the pressurization process, the pulse wave After checking for a decrease in the amplitude and determining that it has decreased, the cuff pressure corresponding to that point is taken as the mean blood pressure (actually greater than the mean blood pressure by α), the systolic blood pressure is calculated based on the above correlation, and this systolic blood pressure is calculated. If a slightly higher value is set as the pressurization target value, an appropriate pressurization target value corresponding to the reference blood pressure can be set.

The electronic sphygmomanometer of the present invention was created by paying attention to the principle described in "-", and includes a pulse wave amplitude detection means for detecting the amplitude of a pulse wave component at a predetermined period, a cuff pressure sensor, and a pressurization process. a pulse wave amplitude decrease determination means for determining that the pulse wave amplitude detected by the pulse wave amplitude detection means has decreased; and when the pulse wave amplitude decrease determination means determines that the pulse wave amplitude has decreased, The device is characterized by a means for calculating a pressurization target value based on the cuff pressure corresponding to this determination time point, and the pressure is increased to this pressurization target value, and the system then shifts to the decreasing process.

In this electronic blood pressure monitor, pressurization of the cuff is started at the start of operation, pulse wave amplitude is detected at a predetermined period, and as the pressurization progresses, it is determined whether the change in pulse wave amplitude is in a decreasing state or an increasing state.

At the initial stage of pressurization, the pulse wave amplitude is in an increasing state, but it is determined that the pulse wave amplitude has gradually shifted to a decreasing state. When a decrease is determined, it means that the cuff pressure has been increased to a level higher than the average blood pressure, and the cuff pressure at that time is applied to a predetermined calculation formula to calculate the target pressure value. Then, the pressure is increased to the calculated pressurization target value, and then the process moves to a depressurization process using slow exhaust, and then the process moves to blood pressure determination processing, that is, measurement operation. There is a correlation between the cuff pressure and the average blood pressure at the time when a decrease is determined, and an appropriate pressurization target value can be set corresponding to the average blood pressure and the systolic blood pressure.

(E) Examples The present invention will be explained in more detail with reference to Examples below.

FIG. 4 is a block diagram of an electronic blood pressure monitor in which the present invention is implemented.

The pressure of the cuff wrapped around the upper arm is communicated through an air passage 2 to a pressure sensor 3, a pump 4, a rapid exhaust valve 5, and a slow exhaust valve 6. The pump 4 is turned on/off by a command signal from the CPU 9, and pressurizes the cuff 1 through the air passage 2 when turned on. The rapid exhaust valve 5 is also turned on and off by a command from the CPU 9, and when turned on, the air pressure in the air passage 2, that is, in the cuff 1, is rapidly exhausted. Pressure sensor 3 converts air pressure within cuff 1 into an electrical signal. The converted cuff pressure signal is amplified by an amplifier 7, converted to a digital signal by an A/D converter 8, and then converted to a digital signal by an A/D converter 8.
It has been incorporated into U9.

The CPU 9 has a digital filter function for extracting pulse wave components superimposed on the captured cuff pressure signal, a function for detecting each amplitude of the pulse wave amplitude series, and a function for detecting each amplitude of the pulse wave amplitude series with the captured cuff pressure signal. It has a function of determining the systolic blood pressure and diastolic blood pressure value, and also a function of controlling on/off of the pump 4, rapid exhaust valve 5, etc.

CPU9 system? The series of actions under III are:
The measurement is started by operating the pressure switch 12, and the measurement results are displayed on the digital display 11. However, the hardware configuration of the electronic blood pressure monitor of the above-described embodiment is not particularly different from the conventional one.

In the electronic blood pressure a1 of this embodiment, when the force 11 pressure switch 12 is turned on, it first enters the pressurization process, determines the pressurization target value, then shifts to the slow JJI process, and then moves to the measurement operation. This embodiment electronic + fi mouth fEM (characteristics of CP
A force that responds to turning on the pressurization switch 12 on LJ 9 ■ A function that determines a decrease in the pulse wave amplitude train during the 1-pressure process, and automatically calculates the target pressurization value from the corresponding cuff pressure when a decrease is determined. This is because it has the function of

Details of these functions will be described later.

Next, with reference to FIG. 1, processing operations in the pressurizing process will be described.

First, when the measurer turns on the pressure switch 12, step ST (hereinafter referred to as ST) 1 "pressure switch on?"
The judgment becomes YES, and the initial pressure P.

(approximately 90 mm 1 g) is set and stored as the initial target value PST (ST2), the rapid exhaust valve 5 and the slow exhaust valve 6 are turned off, and the pump 4 is turned on to start pressurizing (ST3).
. As a result, the pressure in the cuff 1 increases. The cuff pressure during this rising process is converted into an electrical signal by the pressure sensor 3 and read into the CPU 9. To read the cuff pressure, a timer T is started and every time T is up, the cuff pressure is read.
That is, it is read every predetermined period T and is stored in the memory within the CPUQ (ST4, ST5.5T6). Then, it is determined whether the read cuff pressure Pc in the rising process is equal to or higher than the target values P, T (ST7), and the cuff pressure Pc is set to the target value P.
Return to ST4 until it exceeds sr (90mmHg),
The cuff pressure reading operation is repeated. Cuff pressure PC is 90m
When mHg is reached, the determination in ST7 becomes YES, and here the pump 4 is turned off (ST8), and the cuff pressure is maintained at a constant level (although the cuff pressure drops slightly by stopping the pump 4).

After stopping the pump, perform further cuff pressure sampling (
ST9), the pulse wave component superimposed on the cuff pressure is extracted, and the pulse wave amplitude is extracted (ST10). Details of the cuff pressure sampling process and pulse wave amplitude extraction process will be described later.

When the pulse wave amplitude is extracted by this 5TIO process, the pulse wave amplitude is stored and CA is performed in ST1.1.

=N or not. This CAU is calculated by adding ΔP (for example, 10 mml1g) to the initial HUI target value psr.
This is a counter that increments I by 1 each time a new set value is set, and in this embodiment, N=2 is set. In other words, ΔP is added twice, and St 3 times the pressure step 90
．． The pulse wave amplitude is extracted at the target value PST of 100.110 mm 1 g, and since CA Ll≠N at the beginning, this judgment is NO, and then at 5T12, as mentioned above, psT + ΔP, that is, 90 + 10 = 100 mm.
Store Hg as a new target value psi. Then, the pump 4 is turned on again (5T13) and pressurization is continued to the target value PST (ST14), and this cuff pressure Pc is set to PST.
(10'Omm 14g), turn off the pump 4 again (5T15), return to ST9, perform cuff pressure sampling processing and pulse wave amplitude extraction processing in the same manner as above,
Extract the pulse wave amplitude at 100 mm/g. Repeat this process twice (Call-2), target value PST = 90
．． 100.110mm) When the pulse wave amplitude corresponding to Ig is extracted, the determination in 5TII becomes YES and the process moves to 5T16. Above target value Pst””90.100.110
An example of the change in cuff pressure in mmHg is shown in Figure 5 (a
The pulse wave amplitude sequence in this state is shown in FIG. 5 (bl).

In the case of 5T16, it is determined whether AU(nl is decreasing.AU[nl is the cuff pressure of 90.100.
．． 110 mml (pulse wave amplitude AU+ when fixed at g
1), A U (21, A U +31 amplitude series is shown, and if each pulse wave amplitude series of this AU+nl is in a decreasing state with the pressurization process, the determination is YES and the process moves to 5T20, but If it is in an increasing state, the judgment is No.
Then, the process moves to 5T17, where it is determined whether the determination that A U (nl is not in a decreasing state) has been obtained twice.

If the pulse wave amplitude is not initially in a decreasing state, that is, if the pulse wave amplitude is also increasing or constant, this determination will be NO. In the above example, if the pulse wave amplitude extracted at cuff pressures of 90, 100 and 110 mmHg is not in a decreasing state, a new set value p (for example, 120 mmmm1l is set as the target direct PST) and the counter CALI is reset. 5T19) and return to ST3 again. Then, the rapid exhaust valve 5 and the slow exhaust valve 6 are turned off, the pump 4 is turned on and pressurized, and while reading the cuff pressure in the process of Sr1, the cuff pressure is increased until it reaches the new target value P sr (120 mm 1 g). Press (ST4-5T7). When it reaches 120mm 1g, turn off the pump 4 and repeat the process of ST9 to 5T16 in the same way as the process of 90.100-110mm) Ig mentioned above, this time 120.1
30.The cuff pressure is fixed at each of the three levels of 140n+mHg, the pulse wave amplitude corresponding to each cuff pressure is extracted, and each time it is determined whether or not A U (nl) is decreasing in that state ( ST16).The second A of this 5T16
If the decrease determination of U+nl is No, the determination of whether or not the state of not decreasing in 5TI7 is twice becomes YES,
If this judgment becomes YES, the process moves to 5T21 and P
MAX, for example, 240 mmHg as the target pressurization value P SE
After storing it as T, the process moves to 5T22.

On the other hand, if the first pulse wave amplitude sequence AUfn+ is in a decreasing state at 5T16, or the second pulse wave amplitude sequence A U
If +nl is in a decreasing state, the determination at 5T16 becomes YES, and then at 5T20, a new pressurization target value is calculated. This calculation is based on the pressurization target value PSET = (P
x-18) Calculated at 10.64-20mmHg. Here, Px is the minimum cuff pressure corresponding to N amplitude trains, and in the case of the first pulse wave amplitude train, Pa (= 90 mm
Hg>, in the case of the second pulse wave amplitude sequence, P, (= 1
10 mm/lg).

In the above formula, (P x −18) 10.6 is,
If Px is the average blood pressure, it is a value equivalent to the systolic blood pressure value, and the target pressurization value is the addition of 20 mmHg to this value.When the pump 4 is stopped, 10 mm
20 mmHg is added in consideration of the fact that the cuff pressure decreases by about Hg and that the pressure is increased by about 10 mmHg more than the systolic blood pressure value. Therefore, when p x = 90 mm 11 g, the above pressurization target value is P s +: r =
140 mm11g, and if PX = 120mmHg, Pser = 19
It becomes 0mmHg. In addition, if both pulse wave amplitudes cannot be determined to be in a decreasing state, use PSE air 240 mm 1 g.
Therefore, in this example, each 140.19
One of the three levels of 0.240 mmHg will be selected and automatically set.

When the pressurization target value PST is set as described above,
The pump 4 is turned on (ST22), and from that point on, pressurization is restarted again, and the cuff pressure Pc is increased until it reaches the pressurization target value set above. When the cuff pressure Pc reaches the pressurization target value pst, 5T23 The determination is YES, the pump 4 is turned off (5T24), the slow exhaust valve 6 is opened (ST25),
The process will now proceed to normal measurement processing.

In the above pressurization processing process, if the subject has low blood pressure or normal blood pressure, a decrease is determined in the first pulse wave amplitude sequence AUfnl, and an example of the cuff pressure and pulse wave amplitude sequence in this case is As shown in Figure 5 fal fbl, if the subject has normal blood pressure or hypertension, the decrease in AU (nl) cannot be determined at the first time, but is determined at the second time, and the change in cuff pressure and The pulse wave amplitude sequence is shown in FIG. 6 (al (b)), and if the subject has hypertension, the pulse wave amplitude sequence AU
The decrease in (n) could not be determined in either the first or second case, and the cuff pressure change and pulse wave amplitude sequence in this case were
Figure 7 (al (shown in bl).

Next, with reference to the flowchart shown in FIG. 2, the blood pressure measurement process after calculation of the pressurization target value will be described.

The flow shown in FIG. 2 shows the case where the systolic and diastolic blood pressures are determined based on the pulse wave amplitude, and since this blood pressure measurement process is not a feature of the present application, it will be briefly explained.

Turn off the pump 4 according to the flow shown in Figure 1 (5T24),
Further, the slow exhaust valve 6 is opened (ST25), and when the slow exhaust starts, the process moves to 5T26 in FIG. 2, and the T2 timer is started. This T2 timer is a timer that defines the window period for extracting the pulse wave amplitude, and then
Start the T1 timer, which is shorter than the timer (Sr2
7). As described above, this T1 timer is a periodic timer for reading pulse wave amplitude and cuff pressure data.

Every time the timer performs a time amplification (Sr28), the cuff pressure data P c (it) is read (Sr29), and the pulse wave extraction digital filter Pu(i) is operated (Sr3
0), and this process is performed until T2 times up (S
r11), cuff pressure data P c (+1 and pulse wave extraction data p
Read u(1) and extract the pulse wave extracted component P within that period.
From the maximum and minimum values of u t+), pulse wave amplitude A p
(Determine nl (Sr32), and then determine each pulse wave amplitude A pfn+ every two periods, and determine whether or not this pulse wave amplitude Ap is increasing (Sr33). If it is increasing, 5T38) at the Ap increase/increase rough flag 1), the cuff pressure corresponding to the above-mentioned pulse wave amplitude extraction is captured.

When the pulse wave amplitude Ap changes from increasing to decreasing, the determination in 5T33 becomes No, and then it is determined whether the Ap increase/increase flag is 1 (Sr34), and this AI) increasing flag is 1.
This means that there has been a transition from increase to decrease, and then in 5T35, the Ap increase/increase rough flag is set to 0, and A p(nl
After calculating the maximum value ApMAX of this Ap(nl) (S736), the process moves to 5T37 and 0.6
Ap MAX! Ap' (A p' which becomes nl
(n) and set the cuff pressure corresponding to A p (nl as the systolic blood pressure. After that, in 5T34 after returning from 5T37 to 5T26, the Ap increase/increase rough flag is all set to 0, so This judgment has led to the extraction of NOl, that is, the pulse wave amplitude that is in a decreasing state, so this time it is 5T.
In step 39, it is determined whether 0.7A p MAX > Ap(n). Then, repeat the above process until it becomes 0.
7A p MAX becomes 0 when it becomes smaller than A p (nl)
．． 7A p MAX = A p fnl is searched, and the cuff pressure corresponding to that Ap[n] is set as the diastolic blood pressure (Sr
40) Display the systolic blood pressure and diastolic blood pressure determined as above on the display 11.Sr11), rapid υ1 air valve 5
Turn on to decrease cuff pressure and end the measurement.

The blood pressure determination process shown in FIG. 2 is based on the pulse wave amplitude A.
Although the case where the systolic blood pressure and diastolic blood pressure are determined by extracting the It can also be applied to blood pressure monitors that are legal to detect blood pressure and determine blood pressure from the time of its occurrence and disappearance.

Here, details of the pulse wave amplitude extraction process in 5TIO of the flowchart of FIG. 1 will be explained with reference to the flowchart of FIG. 3.

When step 10 is entered in the flowchart of FIG. 1, the process moves to the subroutine of FIG. 3, where cuff pressure sampling processing is performed at 5T101 to obtain P C+i). and 5T102
Differentially calculate P c (1) to obtain white C(11).

This pc (1) is calculated by the following formula, for example.

p c (means il is descending, 5T10
Determination 3: YEST: Go to ST104 and set white C-F to 1. Then, it is difficult to determine whether white c+'F is 1 or not, and if it is not 1, the process returns to 5TIOI, and the above-mentioned cuff pressure sampling process and differential calculation of Pc(1) are repeated. Here, c-F is a flag indicating that pc is negative, and c+F is a flag indicating that pc is positive. As the process progresses,
When cuff pressure P C(]1 changes from falling to rising, +4)
Since c fil becomes larger than 0, the judgment of 5T103 becomes No, and then white C+F is set to 1 and ST
IO6), 5TI07 determines whether pc-F is 1 or not. Until then, white c-F is set to 1, so 5T1
The determination in 07 is YES, and in 5T108, Fri c-F is set to 0, and the cuff pressure at that time Pc (it is the rising point of the pulse wave, that is, the minimum cuff pressure is set as PC(n)1.I+
(ST109). And again 5TIOI
and returns to 5T103 until pc(I) becomes smaller than O, that is, until p c iil changes from rising to falling, the judgment of 5T103 becomes No, so 5T
102 to 103.5TI0G and 5TI07 are repeated. When the cuff pressure P c (1) changes from an increase of -L to a decrease of 1i, pc(il<O), and the determination of 5T103 is YES.
Then, move to 5T104, set p c -F to 1, and set 5
At T105, it is determined whether white c+F is 1 or not.

This judgment is YES because ISC+F has already been 1 up to that point, and we move to 5TIIO, set PC0F to O, and set the cuff pressure P c (il) at that point to the peak point of the pulse wave P c (nlMA). Remember (ST111
), and with 5TI1.2, I)c (nlMA P
c (nl), and calculate this as the pulse wave amplitude A U
(Lift 1 as nl.

Through the above processing, the pulse wave amplitude A [J (nl) is obtained.

FIG. 8 shows the three-step change portions of the cuff pressure Pc for extracting the pulse wave amplitude sequence AU (nl): 90, 10, 110 mmH.
FIG. 8 is a diagram showing a changing waveform at g, and FIG.
Figure 8 (bl) is an enlarged view of the image, in which the pulse wave component is superimposed on the cuff pressure Pc, and the cuff pressure Pc is 90.100.1.
Although it is fixed at 10 mmHg, in reality, the cuff pressure drops slightly and changes as shown in the figure. FIG. 8 [C1 is a waveform obtained by differentiating this. Figure 8 (dl), Figure 8 (bl
O cuff pressure and Figure 8 (The differential waveform of C1 is enlarged to show an example of pulse wave amplitude extraction. corresponds to the zero cross point of the differential waveform, and this Pc(nl, .

The difference A U (nl) between and pc(nl, 4+) is the pulse wave amplitude. In this electronic blood pressure monitor, the pressurization target value is determined based on how the pulse wave amplitude AU(nl changes, that is, whether it decreases or increases.

In addition, in the above embodiment, in order to obtain the pressurization target value, 90
．． 100.110mm11g and 120.130.14
The pulse wave amplitude sequence is obtained in two stages of 0 mm and 11 g, and a decrease is determined in each of the two stages. However, in this invention, the decrease is determined continuously without being limited to these two stages. The reduction determination may be repeated until the cuff pressure reaches 24.0 mmHg, and the pressurization target value may be set at the stage when the reduction determination is made.

(F) Effect of the invention According to this invention, it is determined that the pulse wave amplitude is decreasing during the pressurization process, and at the point of decrease, the target pressurization value is automatically set based on the cuff pressure corresponding to that point. Since the target pressure value is calculated according to the patient's current blood pressure value, it is possible to set a pressurization target value that corresponds to the patient's current blood pressure value, thereby preventing excessive or insufficient pressurization, and preventing unnecessary pain from being caused to the patient. It is possible to avoid the inconvenience of re-measurement due to failure of measurement.

Furthermore, since the pressurization target value is automatically calculated through electronic processing, there is no need for a pressurization setting device like in conventional electronic blood pressure monitors, which has the advantage of reducing costs accordingly. .

[Brief explanation of the drawing]

FIG. 1 is a flowchart of the pressurization process to explain the operation of an electronic blood pressure monitor according to an embodiment of the present invention, FIG. 2 is a flowchart showing the blood pressure measurement operation of the electronic blood pressure monitor, and FIG. is the first
FIG. 4 is a block diagram of an embodiment of the electronic blood pressure monitor;
Figure 5 fal (b) is a diagram showing an example of the cuff pressure and pulse wave amplitude when the subject has low blood pressure or normal blood pressure in the electronic blood pressure monitor, and Figure 6 fal (bl indicates the subject's blood pressure). Figure 7 (al) is a diagram showing an example of cuff pressure and pulse wave amplitude when the subject has normal blood pressure or high blood pressure; Figure 8 (al (b) (c) (di is a waveform diagram for explaining the pulse wave amplitude extraction operation, Figure 9 is a diagram for explaining the correlation between systolic blood pressure and mean blood pressure in blood pressure measurement, 10
Figures (a) and (b) are diagrams showing examples of changes in cuff pressure and examples of changes in pulse wave amplitude for explaining a method of determining mean blood pressure and systolic blood pressure based on pulse wave amplitude. 1: Cuff, 3: Pressure sensor, 4: Pump, 5: Rapid exhaust valve, 6: Slow exhaust valve, 8: A/D converter, 9: CPU, 12: Pressure switch. Figure 8 Figure 9 SYS mmHg Proceeding Officer (spontaneous) June 4, 1988 Patent Application No. 242577 of 1988 2 Title of invention Electronic blood pressure monitor 3 Relationship with the amended person case Patent applicant address: 10 Hanazono Tsuchido-cho, Ukyo-ku, Kyoto City Name (
294) Tateishi Electric Co., Ltd. Representative Takashi Tateishi Aje (1 idiot) 4. Agent ◎604 Address 1 Kyoto Muro Building 5F, 3-3 Mibu Kayo Gosho-cho, Nakagyo-ku, Kyoto City 6. Subject of amendment (1) Statement of statement In the second line of page 14, the word "and" is corrected to "kara." (2) In the 5th line of page 14 of the specification, the word "and" is amended to read "kara." (3) In the 8th line of page 14 of the specification, the statement ``The subject has high blood pressure 1 is corrected to ``The subject has extremely high blood pressure J.'' (4) In the 8th line of page 18 of the specification, The 2nd line, the 6th line of the same page, the 6th line of the same page, the 14th line of the cylinder of the same page, and the 15th line of the box of the same page, respectively, replace rl'c-FJ with 'F(-pC
) Correct as J. (5) In the 3rd line of page 18 of the specification, and from the 7th line to the 8th line of the same page, the words ``rl'c 10F'' were respectively corrected to ``F(+ or C)J. (6) Correct nc-FJ on the 5th line of page 19 of the specification to rF(- or C). (7) Correct the 6th line of page 19 of the specification, From the 7th line of the same page and the 8th to 9th lines of the same page, respectively, "1')C
10F" is corrected to rF 1tpc)J, respectively. (8) Correct Figure 3 of the drawings to reflect a separate member. 8. List of attached documents (1) Drawings [Figure 3] 1 or more copies

Claims (1)

[Claims] (1) In an electronic blood pressure monitor that pressurizes a cuff to a target value and then measures blood pressure through electronic processing during the cuff decompression process, a pulse wave amplitude detection means that detects the amplitude of a pulse wave component at a predetermined cycle; a cuff pressure sensor; a pulse wave amplitude decrease determining means for determining that the pulse wave amplitude detected by the pulse wave amplitude detecting means has decreased during the pressurization process; means for calculating a pressurization target value based on the cuff pressure corresponding to the time of this determination,
This electronic blood pressure monitor is designed to pressurize up to this pressurization target value and then proceed to the depressurization process.