JP5026541B2 - Electronic blood pressure monitor - Google Patents

Description

  The present invention relates to an electronic sphygmomanometer based on a vibration method (oscillometric method) for calculating a systolic blood pressure and a diastolic blood pressure based on an arterial pulse wave component for each heartbeat superimposed on a cuff pressure.

  Blood pressure measurement using such an electronic sphygmomanometer is performed by winding a cuff with a built-in rubber sac around the upper arm of the subject and gradually increasing or reducing the pressure in the cuff. Cuff pressure) The pulse wave due to the pulsation of the blood flow superimposed on the signal is detected, the maximum peak value of the pulse wave is determined, and the pulse wave value obtained by multiplying it by the predetermined ratio α is high corresponding to the time when the peak value is generated The lower cuff pressure corresponding to the time when the crest value obtained by multiplying the different ratio β is generated is set as the lowest blood pressure. Alternatively, there is a variation parameter determination method for determining the timing based on the variation parameter of the arterial pulse wave value (see Patent Document 1).

  However, if a body movement (artifact), which is the movement of the body of the person being measured, occurs during blood pressure measurement, the arm muscles expand and contract and the volume in the cuff changes, resulting in a sudden increase in the cuff pressure signal. Pressure reduction or pressurization occurs. When such a sudden change in cuff pressure occurs, the pulse wave cannot be accurately detected, which adversely affects blood pressure measurement accuracy.

  Therefore, when detecting a pulse wave superimposed on the cuff pressure signal in the process of gradually increasing or decreasing the pressure in the cuff with an electronic sphygmomanometer, abnormal data including body movements and noise signals are removed. Various proposals have been made to calculate the systolic blood pressure and the diastolic blood pressure using only appropriate pulse waves (see Patent Document 2 and Patent Document 3).

Japanese Examined Patent Publication No. 3-62088 Japanese Patent Publication No. 5-32053 Japanese Unexamined Patent Publication No. 7-39529

  As described above, if the systolic blood pressure and the diastolic blood pressure are calculated only from appropriate pulse waves from which abnormal data and noise signals have been removed, blood pressure can be measured even with some abnormal data and noise. When there was a large body movement, the reliability of the measurement result was low.

  Therefore, when it is determined that abnormal data or noise detected during measurement is a body motion, the measurement result is displayed or a warning sound is notified together with the measurement result, and the reliability of the measurement result is confirmed to the measurement subject. It may be possible to recognize that it is low, or to interrupt the measurement and prompt a remeasurement. However, abnormal data and noise during measurement are not only those that have a large effect on the measurement results, so if such notification is frequently made or the measurement is interrupted, it will be bothersome for the subject and electronic blood pressure There was a problem that the credibility of the meter itself could be questioned.

The present invention has been made to solve such problems, and even if abnormal data such as body movement or noise during measurement does not have a large effect on the measurement result, it is notified. An electronic sphygmomanometer that only informs you when body movements that have a major impact on the measurement results are detected without interrupting the measurement or interrupting the measurement and prompting you to remeasure The purpose is to provide.

In order to achieve the above object, an electronic sphygmomanometer according to the present invention has a cuff, a pressurizing unit that pressurizes the pressure in the cuff, a depressurizing unit that depressurizes the pressure in the cuff, and a control that controls pressurization and depressurization. Means, a pressure sensor for detecting the pressure in the cuff, a blood pressure value calculating means for calculating a blood pressure value based on the amplitude of the pulse wave component included in the output signal value of the pressure sensor, and body movement during decompression in the cuff Body motion detection means for storing the pressure value at the time of detection, and body motion notification when the body motion detection pressure value detected and stored by the body motion detection means is within a predetermined range or Body motion determining means for determining that the measurement is to be stopped, and has a pulse wave detecting means during pressurization for detecting the amplitude of the pulse wave component included in the output signal of the pressure sensor and the pressure value at that time during pressurization in the cuff. The predetermined range is the pulse wave detection detected by the pressurizing pulse wave detecting means. Range der the amplitude of is determined by the pressure values at the time of maximum is, the amplitude of the pulse wave component is characterized in that the amplitude of the differential waveform of the pressure signal detected by the pressure sensor.

The range in which the pressurization pulse wave detecting means is determined depending on the pressure value detected, may in the range of from about ± 10 mmHg with respect to the pressure value at the time the amplitude of the differential waveform is maximum.

Of course, it is good to have a body motion notifying means for notifying that there has been a body motion when the body motion determining means determines that a body motion has been reported.

  Similarly to the conventional electronic sphygmomanometer, blood pressure calculation means for calculating the highest blood pressure and the lowest blood pressure based on the maximum peak value of the normal pulse wave, and the highest blood pressure and the lowest blood pressure calculated by the blood pressure calculation means. Providing display means for displaying can be performed as appropriate.

  When the body motion notification means is provided, the display means for displaying the blood pressure measurement result is a means for displaying the presence of body motion in characters or graphics, or the sound, warning sound, lighting or blinking of a warning lamp, the display means Means for notifying the presence of body movement by either blinking the display of the measurement result or changing the display color.

  The electronic sphygmomanometer according to the present invention performs measurement without informing or interrupting the measurement, even when noise such as body movement is detected during blood pressure measurement, if it does not greatly affect the measurement result. Only when a body movement that greatly affects the measurement result is detected, it can be determined to notify the body movement or stop the measurement and prompt a remeasurement. As a result, body motion is frequently notified or measurement is interrupted, and the reliability of measurement accuracy is not impaired, and the reliability of blood pressure measurement is increased.

It is a block diagram which shows the structure of one Embodiment of the electronic blood pressure meter by this invention. It is a wave form diagram which shows the example of the output signal (pressure detection signal) of the pressure sensor during the pressurization in a cuff of the electronic sphygmomanometer shown in FIG. FIG. 3 is a diagram for explaining the relationship between the pulse wave height of the pulse wave component included in the output signal of the pressure sensor and the systolic blood pressure and the systolic blood pressure shown in FIG. 2 and the influence of body movement. It is a flowchart which shows the flow of the blood-pressure measurement process by the microcomputer 6 shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  First, the configuration of an embodiment of an electronic blood pressure monitor according to the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of the electronic sphygmomanometer, (a) is a schematic configuration diagram of the whole, and (b) is a functional block diagram showing the functional configuration of the storage / calculation means 10 in (a).

  As shown in FIG. 1 (a), this electronic sphygmomanometer includes a cuff 1, a pressurizing means 2, a depressurizing means 3 and a pressure sensor 4 respectively connected to the cuff 1 by a tube 12, and further includes a signal. The system includes an A / D converter 5, a microcomputer 6, operating means 7, display means 8, and body movement notifying means 9. In the figure, open bold lines indicate the air flow, and black thick lines indicate the signal flow.

  The cuff 1 is a band-shaped or cylindrical flexible member in which a rubber sac wound around the upper arm or wrist of the measurement subject is integrated. The pressurizing unit 2 is a pressurizing pump that sends air into the cuff through the tube 12 and pressurizes it. The depressurizing unit 3 is a constant-speed depressurizing unit that releases the air in the cuff at a constant speed through the tube 12 and decompresses the remaining air. It consists of a pressure reducing valve for performing rapid pressure reduction that exhausts rapidly.

  The pressure sensor 4 is a sensor that detects the pressure in the cuff 1 and converts it into an electrical signal. For example, a semiconductor pressure conversion element or a strain gauge is used. The A / D converter 5 converts an analog electrical signal (for example, a voltage signal) output from the pressure sensor 4 into a multi-value digital signal.

  The microcomputer 6 is connected to a central processing unit CPU, a read only memory (program memory) ROM, a read / write memory (data memory) RAM, and an input / output unit I / O port. The CPU executes a blood pressure measurement program stored in the ROM by a CPU bus or the like, and executes blood pressure measurement processing. In FIG. It shows.

  The function of the control means 11 is to control the pressurization operation by the pressurization means 2 and the constant speed decompression operation and the rapid decompression operation by the decompression means 3. When a measurement start button (not shown) of the operating means 7 is pressed, the pressurizing pump of the pressurizing means 2 is operated, air is sent into the cuff 1 to rapidly pressurize, and is detected by the pressure sensor 4. When the pressure in the cuff 1 reaches a predetermined value, the pressurizing pump is stopped.

  Thereafter, constant pressure reduction is performed by the decompression means 3. At this time, when a rubber exhaust valve is used as the constant speed pressure reducing valve, the pressure is reduced at a substantially constant speed by the rubber exhaust valve. At the end of blood pressure measurement, a rapid pressure reducing valve provided separately from the rubber exhaust valve is opened, and the air remaining in the cuff 1 is rapidly exhausted. When a solenoid valve is used as the constant speed pressure reducing valve, the opening degree of the solenoid valve is determined according to the detected pressure value in the cuff 1 detected by the pressure sensor 4 so that the pressure in the cuff 1 is reduced at a constant speed. To control. At the end of blood pressure measurement, the solenoid valve is fully opened, and the air remaining in the cuff 1 is rapidly exhausted.

  The function of the storage / calculation means 10 by the microcomputer 6 will be described later.

  The operating means 7 has various buttons and switches operated by the subject at the time of blood pressure measurement. For example, a measurement start button also serving as a power switch, an ID button for inputting the subject's identifier, and a measurement result A memory button or the like is stored as appropriate.

  The display means 8 displays the maximum blood pressure and the minimum blood pressure calculated by the storage / calculation means 10 of the microcomputer 6 and is, for example, a liquid crystal display device. The display means 8 may also display the pulse rate and time.

  The body motion notifying means 9 is a means for notifying that there has been a body motion when the memory / calculating means 10 of the microcomputer 6 determines that the body motion has been reported. "Please measure again.", Beep with an electronic buzzer, or turn on or blink a warning lamp. Alternatively, the display means 8 can also be used to display “with body movement” on the display means 8 with characters or figures (marks), blinking the display of the highest blood pressure and the lowest blood pressure as measurement results, It may be displayed in a different color.

  As shown in FIG. 1B, the storage / calculation means 10 by the microcomputer 6 includes a pressurizing pulse wave detecting means 13, a depressurizing pulse wave detecting means 14, a body motion detecting means 15, a blood pressure calculating means 16, and a body motion. It has the function of the determination means 17.

  The pressurizing pulse wave detecting means 13 detects the amplitude of the pulse wave component included in the output signal of the pressure sensor input via the A / D converter 5 during pressurization in the cuff 1 and the pressure value at that time. Remember.

  The depressurizing pulse wave detecting means 14 detects a pulse wave component included in the output signal of the pressure sensor input via the A / D converter 5 during depressurization in the cuff 1.

  The body motion detection means 15 detects body motion during decompression of the cuff 1 and stores the pressure value at the time of detection. A method for detecting the body movement will be described later.

  The blood pressure calculation means 16 calculates the maximum blood pressure and the minimum blood pressure based on the maximum peak value of the pulse wave detected by the decompressing pulse wave detection means 14. The calculation method will be described later.

The body motion determining means 17 is a pulse wave component among the amplitude and pressure value of the pulse wave component detected and stored by the pulse wave detecting means 13 during the pressurization detecting and storing the body motion detected by the body motion detecting means 15. When it is within a predetermined range with respect to the pressure value at the time when the amplitude of the maximum value is determined, it is determined that the body movement is notified or measurement is stopped.
The body motion determination unit 17 detects the body motion when the body motion detection unit 15 detects the body motion and stores the pressure value within the range from the maximum blood pressure value calculated by the blood pressure calculation unit 16 to the minimum blood pressure value. It is determined that notification or measurement is stopped.

  The systolic blood pressure and the diastolic blood pressure calculated by the blood pressure calculating means 16 are displayed on the display means 8, and when the body motion determining means 17 determines that the body motion is notified, the body motion notifying means 9 notifies that there is a body motion. Is done. When the body movement determination means 17 determines that the measurement is to be stopped, the measurement operation is stopped at that time, and the remaining air in the cuff 1 is also rapidly exhausted.

  Here, FIG. 2 shows an example of an output signal (pressure detection signal) of the pressure sensor 4 and its differential waveform during pressurization and decompression in the cuff 1 during blood pressure measurement by this electronic sphygmomanometer.

In this embodiment, as described above with reference to FIG. 1, when the measurement start button of the operating means 7 is pressed, the pressurizing pump of the pressurizing means 2 is operated to send air into the cuff 1 and rapidly pressurize it. When the pressure in the cuff 1 detected by the pressure sensor 4 reaches a predetermined value (220 mmHg in this example), the pressure pump is stopped. Thereafter, the pressure in the cuff 1 is reduced at a substantially constant speed by the pressure reducing valve of the pressure reducing means 3.

  A thick solid line with a small amplitude shown in FIG. 2 indicates an output signal (pressure detection signal) of the pressure sensor 4 in the meantime. The fine fluctuations in pressure indicate the superposition of pulse waves. The horizontal axis represents time [sec], and the vertical axis represents pressure [mmHg].

  Although the pulse wave is superimposed due to blood flow even during pressurization, it is relatively small. When the pressure in the cuff 1 reaches a predetermined value, the blood flow is stopped by pressing the blood vessel of the arm of the subject. When the pressure is relaxed, the blood flow recovers and the artery pulsates, so that a pulsation phenomenon (pulse wave) synchronized with the heartbeat appears superimposed on the pressure in the cuff that decreases at a substantially constant rate. The onset of the pulse wave is small, increases as the pressure decreases, and eventually decreases again after showing the maximum amplitude (maximum pulse wave height). However, if the subject moves during the decompression, such as moving the arm or finger or coughing, a large pressure change occurs.

  A thin solid line with a large amplitude in FIG. 2 indicates a differential waveform obtained by differentiating the pressure detection signal indicated by a thick solid line, and a vertical axis indicates a pressure change rate [mmHg / sec].

  If the pressure value at point A where the differential waveform of the pressure detection signal during pressurization shown in FIG. 2 has the maximum amplitude is Pa, the maximum pulse wave height of the pulse wave superimposed on the pressure detection signal during decompression is detected. Is likely to be near the pressure value Pa.

  FIG. 3 shows each pulse wave (including noise components such as body motion) detected by the pulse wave detecting means 14 during pressure reduction shown in FIG. 1B from the pressure detection signal during pressure reduction shown in FIG. The horizontal axis in FIG. 3 is the pulse wave start pressure [mmHg] when each pulse wave starts to rise, and the vertical axis is the pulse wave height (wave height value) [mmHg]. As shown in FIG. 3, the pulse wave height is small when the pressure in the cuff is high, increases as the pressure decreases, and then decreases again after showing the pulse wave Pmax of the maximum peak value. However, the pulse wave Pn1 mixed with body motion is detected as a pulse wave having an abnormal peak value.

  The blood pressure is calculated based on the pulse wave value of the maximum pulse wave value among the normal pulse wave wave values, that is, the pulse wave value Pmax of the pulse wave Pmax in the example of FIG. That is, a higher pulse wave start pressure corresponding to a peak value of Hmax × 50% obtained by multiplying the maximum peak value Hmax by a predetermined ratio α, for example, 50% is calculated as a maximum blood pressure (SYS), and the maximum peak value is calculated. A lower pulse wave start pressure corresponding to a peak value of Hmax × 70% obtained by multiplying Hmax by a predetermined ratio β, for example, 70% is calculated as a minimum blood pressure (DIA).

  However, if the peak value of the pulse wave Pn1 mixed with body motion is erroneously determined as the maximum peak value Hmax ′, the maximum blood pressure is calculated as the higher pulse wave start pressure SYS ′ corresponding to the peak value of Hmax ′ × 50%. Thus, the minimum blood pressure is calculated as the lower pulse wave start pressure DIA ′ corresponding to the peak value of Hmax ′ × 70%. Then, since SYS ′ <SYS, DIA ′> DIA, pulse pressure = (maximum blood pressure−minimum blood pressure) is calculated to be small.

  Thus, it can be seen that if the pulse wave Pn1 mixed with body motion is generated near the pressure value at which the maximum peak value of the pulse wave is detected, there is a high possibility that the calculation accuracy of the blood pressure value will be greatly affected.

  Therefore, in this embodiment, the differential waveform of the pressure detection signal from the pressure sensor 4 during pressurization in the cuff 1 after the start of measurement by the pulse wave detection means 13 during pressurization shown in FIG. 1B (see FIG. 2). The pulse wave amplitude and the pressure value at that time are detected and stored.

  Further, during the decompression of the cuff 1, the pulse wave detection means 14 during decompression detects the pulse wave peak value as shown in FIG. 3 superimposed on the pressure detection signal from the pressure sensor 4, and the body motion detection means 15 When the movement is detected, the pressure value of the pressure detection signal at that time is stored. As described above, the blood pressure calculation means 16 calculates the maximum blood pressure (SYS) and the minimum blood pressure (DIA) based on the maximum peak value Hmax. The measurement result is displayed on the display means 8.

However, when the body motion is detected by the body motion detection means 15, the pressure value at the time of the body motion detection is differentiated by the body motion determination means 17 from the pressure values stored by the pulse wave detection means 13 during pressurization. It is determined whether or not the waveform is near the pressure value Pa (the pressure value at which the maximum peak value Hmax of the pulse wave is highly likely to be detected) at the point A at which the waveform has the maximum amplitude. Then, it is determined that body movement is reported or measurement is stopped. When it is determined that the body movement is informed, the body movement informing means 9 notifies that there has been a body movement. When it is determined that the measurement is to be stopped, the measurement operation is immediately stopped, the air in the cuff 1 is rapidly exhausted, and the subject is released from the pressure quickly.
On the other hand, even if a pulse wave in which body motion is mixed is generated near the pressure value where the maximum peak value of the pulse wave is detected or in a range not from the maximum blood pressure value to the minimum blood pressure value, such as the pulse wave Pn2 shown in FIG. It can be seen that there is a low possibility that the calculation accuracy of the blood pressure value has a large adverse effect. Therefore, even when such body movement is detected, measurement is performed without determining that body movement is reported or measurement is stopped, and as described above, the maximum blood pressure (SYS) and the minimum blood pressure (DIA) are based on the maximum peak value Hmax. ) Is calculated. The measurement result is displayed on the display means 8.

  Since such processing is performed by the microcomputer 6 shown in FIG. 1A, the flow of blood pressure measurement processing by the microcomputer 6 will be described with reference to the flowchart shown in FIG.

  The measurement is started by turning on the measurement start button of the operation means 7, the pressurization in the cuff 1 is started in step S1, and the pressure detected by the pressure sensor 4 is predetermined until it is determined that the pressurization is finished in step S3. The pressure is increased until the value is reached, and in the meantime, the differential waveform of the pressure detection signal is monitored in step 2, and the pressure value (Pa shown in FIG. 2) that becomes the maximum pulse wave differential amplitude is detected and stored.

  After that, pressure reduction in the cuff 1 is started in step S4, a pulse wave is detected in step S5 while reducing pressure at a substantially constant speed, and it is determined whether or not there is body movement in step S6. The pressure value based on the pressure detection signal at that time is stored.

There are various methods for determining the presence or absence of body movement. As a specific example, it can be determined that body movement is present in any of the following cases.
(1) When the depressurization speed deviates more than a certain level from the target depressurization speed.
(2) A case where the difference between the maximum noise value of the noise waves excluded from the blood pressure calculation target by comparison between the adjacent three pulse waves and the peak value of the maximum pulse wave is a certain value or more.
(3) The differential pulse wave height at the time of depressurization is greater than or equal to h × α with respect to the first or second largest differential pulse wave height h at the time of pressurization.
(4) When the differential downstream amplitude of the pulse wave is three times or more of the previous differential upstream amplitude.
(5) When the cuff pressure is 40 mmHg or less and the pulse wave height is 4.8 mmHg or more.
(6) The current pulse wave start pressure is higher than the previous pulse wave start pressure.

  If no body motion is detected in step S6, the maximum peak value Hmax is determined from the peak value stored as measurement data in step S8, and the maximum blood pressure (SYS) and the minimum blood pressure (DIA) are determined in step S9 as described above with reference to FIG. ) Is calculated. Then, the processes in steps S5 to S9 are repeated until it is determined in step S10 that the blood pressure value calculation is finished.

  Here, the end of the blood pressure value calculation in step S10 is that after both the systolic blood pressure and the diastolic blood pressure can be calculated, the processing in steps S5 to S9 is further repeated to acquire pulse waves for several beats. Judgment is made based on whether or not a pulse wave having a high value Hmax is detected. At this time, if a pulse wave having a maximum peak value Hmax is detected from pulse waves for several beats, the maximum peak value Hmax is updated in step 8 to recalculate the maximum blood pressure and the minimum blood pressure. If the maximum peak value Hmax is not updated, it is determined that the blood pressure value calculation is finished.

  The end of blood pressure value calculation in step S10 may be determined only by whether or not both the maximum blood pressure and the minimum blood pressure have been calculated in step S9.

  Thus, without continuing to detect the pulse wave until the pulse wave can no longer be obtained, the end of the measurement is judged at the time when the maximum blood pressure and the minimum blood pressure are calculated, and the cuff is quickly exhausted, so that the arm of the subject is measured. The time for pressing can be shortened.

If it is determined in step S6 that there is a body movement, in step S7, the body movement is performed in the vicinity of the pressure value (Pa shown in FIG. 2) having the maximum pulse wave differential amplitude among the pressure values detected and stored in step S2. It is determined whether or not it has been detected. The vicinity of the pressure value Pa is whether or not the pressure value Pa is within a predetermined range, for example, within a range of Pa ± 10 mmHg as shown in FIG. Step S7 and later-described steps S14 and S15 correspond to the body movement determination means in FIG.
Here, step S7 calculates a temporary systolic blood pressure value and a temporary diastolic blood pressure value from the amplitude and pressure value of the differential waveform detected and stored in step S2, and the pressure value determined as having body movement in step S6. It is good also as judgment whether it is in the range of a temporary maximum blood pressure value and a temporary minimum blood pressure value. The temporary maximum blood pressure value and the temporary minimum blood pressure value can be calculated in the same manner as the calculation of the blood pressure value during decompression using the amplitude and pressure value of the differential waveform detected and stored in step S2.
Further, if it is determined in step S6 that there is a body movement, it is determined whether or not there is a sudden pressure change before the determination in step S7. If there is a sudden pressure change, the measurement is stopped at that time. If there is no sudden pressure change, the process may proceed to step S7.

  If the pressure value when the body movement is detected is within a predetermined range with respect to the pressure value Pa, the body movement notification is determined in step S14. In step S15, it is determined whether or not the measurement is stopped. If the measurement is not stopped, the process returns to step S5 and the measurement process is continued. If the measurement is stopped, the process proceeds to step S12, and the measurement result is a measurement error. The fact that there was a body movement is displayed on the display means 8 (body movement notification). And it progresses to step S13, the air in the cuff 1 is rapidly exhausted, pressure reduction is complete | finished, and a measurement is complete | finished.

On the other hand, if the measurement is continued and it is determined in step S10 that the blood pressure value calculation is completed, it is determined in step S11 whether the pressure value when body movement is detected during the measurement is within the range between the maximum blood pressure value and the minimum blood pressure value. If it is within the range, the body motion notification is determined in step S16, but if it is outside the range between the maximum blood pressure value and the minimum blood pressure value or if no body motion is detected during the measurement, the process proceeds to step S12 as it is. Display the measurement result with.
In step S12, the maximum blood pressure and the minimum blood pressure as measurement results are displayed on the display means 8. At that time, if the body motion notification is confirmed in step S14 or S16, a body motion mark is displayed to notify that there is a body motion. Finally, in step S13, the air in the cuff 1 is rapidly exhausted to finish the pressure reduction, and the measurement process is terminated.

  As described above, the body motion notifying means 9 for notifying the body motion also displays “with body motion” as a character or a figure (mark) by using the display means 8 as well as lighting a voice, a warning sound, or a warning lamp. Alternatively, various means such as blinking means, blinking of the display of the measurement result by the display means 8, or displaying in a color different from the normal time can be adopted.

  Further, in the embodiment described above, the pulse wave detecting means 14 during pressurization detects and stores the amplitude of the pulse wave component included in the output signal of the pressure sensor 4 and the pressure value at that time during pressurization in the cuff 1. In order to do this, the pulse wave differential amplitude and the pressure value at that time during pressurization are used, but the pulse wave amplitude value and the pressure value at that time may be used instead of the pulse wave differential amplitude.

When pressurization is rapid and it is difficult to detect a simple pulse wave component, it is easier to detect the amplitude by using the differential pulse wave, but when the pulse wave component can be taken, use a simple pulse wave instead of the differential pulse wave. Can do. The pressure values at which the pulse wave and the differential pulse wave become the maximum pulse wave are substantially the same.
In addition, the range of pressure values at the time of body motion detection for which it is determined that body motion is notified or measurement is stopped, that is, the range for the pressure value Pa that becomes the maximum pulse wave differential amplitude during pressurization is not limited to ± 10 mmHg, and can be arbitrarily set. it can.

  As described above, the embodiments of the present invention have been described. As is clear from the description, according to the electronic sphygmomanometer according to the present invention, even if body motion is mixed in the pulse wave during blood pressure measurement, If it does not affect the calculation, continue the measurement without notifying it or stopping the measurement, and notify you when body movement that affects the blood pressure measurement results is detected. The measurement can be stopped and the re-measurement can be promoted only when the body movement having a greater influence on the result is detected. Therefore, body motion is not frequently reported and the reliability of measurement accuracy is not impaired, and body motion is reported and measurement is stopped only when remeasurement is really necessary. It is also possible to prevent recording as it is.

  The electronic sphygmomanometer according to the present invention can be widely applied to various electronic sphygmomanometers based on the oscillometric method for home use, portable electronic sphygmomanometers, and the like, and the reliability thereof can be improved.

1: Cuff 2: Pressurizing means 3: Pressure reducing means 4: Pressure sensor 5: A / D converter 6: Microcomputer 7: Operating means 8: Display means 9: Body motion notifying means 10: Storage / calculating means 11: Control means 12: Tube 13: Pressurizing pulse wave detecting means 14: Depressurizing pulse wave detecting means 15: Body motion detecting means 16: Blood pressure calculating means 17: Body motion determining means

Claims (3)

With cuff,
A pressurizing means for pressurizing the pressure in the cuff;
Pressure reducing means for reducing the pressure in the cuff;
Control means for controlling the pressurization and decompression;
A pressure sensor for detecting the pressure in the cuff;
Blood pressure value calculating means for calculating a blood pressure value based on the amplitude of a pulse wave component included in the output signal value of the pressure sensor;
Body movement detecting means for detecting body movement during decompression in the cuff and storing a pressure value at the time of detection; and a body movement detection pressure value detected by the body movement detecting means and stored. Body motion determination means for determining body motion notification or measurement stop when included in the range;
Equipped with a,
A pressurizing pulse wave detecting means for detecting the amplitude of the pulse wave component included in the output signal of the pressure sensor and the pressure value at that time during pressurization in the cuff;
The predetermined range is a range determined by a pressure value at the time when the amplitude of the pulse wave component detected by the pulse wave detecting means during pressurization is maximum,
The electronic sphygmomanometer , wherein the amplitude of the pulse wave component is an amplitude of a differential waveform of a pressure detection signal from the pressure sensor .   2. The range defined by the pressure value detected by the pulse wave detecting means during pressurization is within a range of ± 10 mmHg with respect to the pressure value at the time when the amplitude of the differential waveform becomes maximum. The electronic sphygmomanometer described in 1. The electronic sphygmomanometer according to claim 1 or 2 , further comprising body motion notifying means for notifying that there has been a body motion when the body motion determining means determines that the body motion has been notified.