JPH1189806A - Bloodless sphygmomanometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate giving pressure and unpleasantness caused by fastening to an examinee by in directly estimating the blood pressure of a body through the use of acceleration pulse waves reflecting the state of the blood circulation system of the body so as to unnecessitate giving pressure of >= a highest blood pressure value to a measuring part through the use of a cuff. SOLUTION: At the time of measuring blood pressure, a pulse wave detecting means 11 is fixed to the finger 15 of the examinee by a fixing tool to irradiate light from a light emitting element 11a. As hemoglobin in blood absorbs light with strong selectivity and the amount of light transmitted through a finger reflects the increase/reduction of a blood amount, a light receiving element receives the transmitted light and a conversion circuit 11c converts it to an electrical signal corresponding to a received light quantity. Then, a signal showing the increase/reduction of the blood amount is sent to a waveform dividing means 16 to be divided into the waveform of time corresponding to one period of heartbeats to be differentiated twice by an accelerating pulse wave output means 12 next to detect the acceleration of pulse waves. This acceleration pulse waves are analyzed to estimate highest/lowest/average blood pressures.

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 monitor for non-invasively measuring the blood pressure of a human body.

[0002]

2. Description of the Related Art A conventional non-invasive sphygmomanometer of this type has a configuration as described in, for example, Japanese Patent Application Laid-Open No. 5-49604. FIG. 4 shows a configuration diagram of a conventional non-invasive blood pressure monitor.

In FIG. 4, reference numeral 1 denotes a main body of a non-invasive sphygmomanometer. The main body 1 includes a display 2 such as a liquid crystal display for displaying a measurement result and the like, power on of the apparatus, start of measurement, power off. A switch 3 for instructing the operation is provided. Reference numeral 4 denotes a connector which engages with the insertion opening of the main body to attach the armband tube 5 to the main body. Reference numeral 6 denotes a cuff, which is pressurized by air that is wound around the arm of the subject and sent through the arm band tube 5 at the time of measurement, and the air is released by opening an exhaust valve in the main body to make the arm band open. It is discharged to the outside via the tube 5 and contracts. Reference numeral 7 denotes a microphone for detecting the Korotkoff sound of the subject, which is connected to a processing circuit in the main body through the arm band tube 5 and the connector 4.

When the subject measures the blood pressure, the cuff 6 is wound around a predetermined position on the arm and the switch 3 is pressed to start the measurement. When the measurement is started, air pressurized by a pressurizing pump (not shown) provided in the main body 1 is provided. Is sent to the cuff 6 through the cuff tube 5 and pressurization is started, and pressurization is performed until the internal pressure of the cuff 6 reaches a preset pressure value. When the pressurization is completed, the exhaust valve in the main body is opened and pressure reduction is started. When the internal pressure of the cuff 6 falls below the subject's maximum blood pressure, a Korotkoff sound starts to be generated. Disappears. The occurrence and disappearance of this Korotkoff sound are detected by the microphone 7 and the pressure of the cuff 6 at that time is detected, whereby the systolic blood pressure and the diastolic blood pressure are determined. The blood pressure value thus determined is displayed on the display 2 of the main unit 1.
And the measurement result is notified to the subject or a third party.

[0005]

However, in the conventional non-invasive sphygmomanometer, it is necessary to apply a pressure equal to or higher than the systolic blood pressure value to the measuring section using a cuff. There is a drawback that it gives a feeling of oppression or discomfort.

[0006]

In order to achieve the above object, a non-invasive sphygmomanometer according to the present invention detects a pulse wave generated by circulation of blood of a human body and outputs a signal corresponding to the magnitude of the pulse wave. Pulse wave detecting means for outputting, a waveform dividing means for dividing an output signal of the pulse wave detecting means into a waveform having a time corresponding to one cycle of a heart beat, and an output waveform of the waveform dividing means is differentiated twice. Acceleration pulse wave output means for calculating and outputting the obtained acceleration pulse wave, and the systolic blood pressure value of the human body based on information obtained from the output of the waveform dividing means and the acceleration pulse wave output by the acceleration pulse wave output means, An average blood pressure value, a blood pressure value calculating means for calculating and outputting at least one of the diastolic blood pressure values, and a notifying means for notifying a subject or a third party of an output of the blood pressure value calculating means, wherein the blood pressure value calculating means The output of the waveform dividing means The apparatus has output correction means for correcting the output of the acceleration pulse wave output means using the set characteristic amount, and the blood pressure value calculation means is provided as a part of information obtained from the acceleration pulse wave output by the acceleration pulse wave output means. The output of the output correction means is used for calculating a blood pressure value.

According to the above invention, the blood pressure of the human body is indirectly estimated by using the acceleration pulse wave reflecting the state of the blood circulation system of the human body. A non-invasive sphygmomanometer that does not need to be added and does not give a subject a feeling of pressure or discomfort due to tightening can be provided.

Further, according to the above invention, the output correction means corrects the output of the acceleration pulse wave output means using the characteristic amount determined by the output of the waveform dividing means, and the blood pressure value calculation means comprises the output of the acceleration pulse wave output means. Since the blood pressure value is calculated using the output corrected by the output correction means in addition to the output waveform, it is possible to calculate the blood pressure value accurately.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A non-invasive sphygmomanometer according to claim 1 of the present invention detects a pulse wave generated by circulating blood of a human body and outputs a signal corresponding to the magnitude of the pulse wave. Detecting means, a waveform dividing means for dividing the output signal of the pulse wave detecting means into a waveform having a time corresponding to one cycle of a heartbeat, and an acceleration pulse obtained by differentiating the output waveform of the waveform dividing means twice. Acceleration pulse wave output means for calculating and outputting a wave, the systolic blood pressure value of the human body based on the information obtained from the output of the waveform dividing means and the acceleration pulse wave output by the acceleration pulse wave output means, the average blood pressure value, Blood pressure value calculating means for calculating and outputting at least one of the diastolic blood pressure values; and notifying means for notifying a subject or a third party of an output of the blood pressure value calculating means, wherein the blood pressure value calculating means comprises The feature quantity determined by the output of the means And output correction means for correcting the output of the acceleration pulse wave output means, wherein the blood pressure value calculating means outputs the output of the output correction means as a part of information obtained from the acceleration pulse wave output by the acceleration pulse wave output means. Is used for calculating the blood pressure value.

Since the blood pressure of the human body is indirectly estimated using the acceleration pulse wave reflecting the state of the blood circulation system of the human body, it is not necessary to apply a pressure higher than the maximum blood pressure value to the measuring unit using the cuff. In addition, the subject does not feel pressure or discomfort due to tightening. Further, the output correction means corrects the output of the acceleration pulse wave output means using the characteristic amount determined by the output of the waveform dividing means, and in the blood pressure value calculation means, in addition to the output waveform of the acceleration pulse wave output means, the output correction means Since the blood pressure value is calculated using the corrected output, it is possible to calculate the blood pressure value accurately.

In the non-invasive sphygmomanometer according to claim 2 of the present invention, the output correction means extracts the amplitude of the output of the waveform dividing means as a characteristic quantity and outputs the output value of the acceleration pulse wave output means. The amplitude is corrected.

Since the output correction means corrects the output of the acceleration pulse wave output means using the amplitude of the waveform dividing means, by calculating the magnitude of the acceleration with respect to the amplitude, the output of the heart beat indicated by the acceleration is calculated. The size can be obtained by excluding the influence of the size of the pulse wave that changes depending on the skin color, measurement conditions, and the like, and accurate estimation of the blood pressure value is possible.

According to a third aspect of the present invention, there is provided the non-invasive blood pressure monitor according to the third aspect of the present invention, wherein the output correction means performs a certain period of time during an attenuation period during which the output of the waveform dividing means takes a minimum value from a maximum value. The amount of attenuation is extracted as a feature amount, and the output value of the acceleration pulse wave output means is corrected with the amount of attenuation.

Since the output correction means corrects the output of the acceleration pulse wave output means using the attenuation amount of the waveform dividing means, the attenuation amount during a certain period of time during attenuation indicating the ease of blood flow in the peripheral blood vessels. Eliminates the effect of pulse wave magnitude, which changes the magnitude of heart beat output indicated by acceleration with skin color and measurement conditions by correcting acceleration pulse wave indicating the magnitude of heart beat output using It is possible to express the pulse output of heart blood and the ease of blood flow in peripheral blood vessels, which are components of blood pressure, with one index, and accurate estimation of blood pressure value can be performed. It becomes possible.

According to a fourth aspect of the present invention, in the non-invasive sphygmomanometer according to the fourth aspect of the present invention, the output correcting means may include an upwardly convex first output which is generated first when the heart valve is opened among the outputs of the acceleration pulse wave output means. The correction is performed only for one peak.

Since the output correction means corrects only the first upwardly convex first peak of the acceleration pulse wave waveform output by the acceleration pulse wave output means, which is generated first when the heart valve is opened. The calculation can be reduced without substantially reducing the effect of the correction, and the blood pressure value can be accurately and easily estimated.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a block diagram of a non-invasive blood pressure monitor according to Embodiment 1 of the present invention.

In the figure, 11 is a pulse wave detecting means, 16 is a waveform dividing means, 12 is an acceleration pulse wave output means, 13 is a blood pressure value calculating means, and 14 is a display. Here, the pulse wave detecting means 11
Is a photovoltaic plethysmograph which detects an increase or decrease in blood volume due to the pulsation of the heart based on a change in the amount of transmitted light.
The light emitting element 1 includes a light receiving element 11b and a conversion circuit 11c.
1a emits light including light having a wavelength of 5000 to 8000 °, which is absorbed by hemoglobin in blood with high selectivity. In addition,
In the present embodiment, the phototube plethysmogram of the finger 15 of the hand is detected and output, and the light emitting element 11a and the light receiving element 11b are fixed at a fixed position on the subject's finger by a fixture (not shown). It is configured to block external light. The blood pressure value calculating means 13 includes an output correcting means 13a, a wave height calculating means 13b, a peak time point calculating means 13c, and a blood pressure value calculating means 13d.

The non-invasive sphygmomanometer of this embodiment operates as follows by the above configuration. That is, when the subject fixes the pulse wave detecting means 11 to the finger 15 of the hand with the fixture, light including light having a wavelength of 5000 to 8000 ° is emitted from the light emitting element 11a. Because hemoglobin absorbs with strong selectivity, the amount of light transmitted through the finger accurately reflects the increase or decrease in blood volume. The light receiving element 11b receives such transmitted light, and converts the light into the conversion circuit 11b.
c, the signal is converted into an electric signal corresponding to the amount of light received. The output signal of the conversion circuit 11c is used to determine whether the increase or decrease in blood volume due to the pulsation of the heart in the portion where the light emitting element 11a and the light receiving element 11b are attached. It can be converted into a signal and extracted. The effect on the human body to extract this signal is based on the light emitting element 11a and the light receiving element 11a.
It is only necessary to fix the fixture having b to the subject's finger so as not to move easily, and no force other than the pressure due to the attachment of the fixture is applied to the subject. The signal indicating the increase or decrease of the blood volume is output from the pulse wave detecting means 11 to the waveform dividing means 16, divided into a waveform having a time corresponding to one cycle of the heart beat, and outputted to the acceleration acceleration pulse wave outputting means 12. The acceleration pulse wave output means 12 differentiates this signal twice by passing it through a two-stage differentiation circuit to calculate the acceleration of the pulse wave (acceleration pulse wave) and outputs the acceleration to the blood pressure value calculation means 13. Here, the acceleration pulse wave represents a force applied to the pulse wave, and a positive value indicates a force in a direction that promotes blood circulation such as a heartbeat, and a negative value indicates a blood resistance such as blood vessel resistance. The magnitude of the force in the direction that inhibits the circulation of Since such a change in the acceleration pulse wave represents the force applied to the blood in the blood vessel, the ability of the heart, which varies greatly between individuals,
It strongly reflects the flexibility of blood vessels, transport resistance in blood vessels, and the like, and is used for diagnosis of abnormalities in the blood circulation system. The acceleration pulse wave and the blood pressure have a strong relationship, and by analyzing this waveform, the systolic blood pressure value, the diastolic blood pressure value, and the average blood pressure value can be estimated.

In the case of such a non-invasive sphygmomanometer, the subject's blood pressure value is estimated by finely analyzing a pulse wave that originally reflects the amount of change in the blood flowing through the site. However, the pulse wave, especially its amplitude, varies in addition to the amount of change in blood, such as the positional relationship between the light emitting element and the light receiving element, the size of the finger, the color of the skin, the distance between the finger and the light emitting element and the light receiving element during measurement, Because the absolute value of each peak is also affected by the acceleration pulse wave, it is difficult to set the measurement conditions when using it for evaluation. was there. However, the absolute value of the acceleration pulse wave also includes information on the pulse output of the subject's heart, and a method for calculating such important information without being affected by measurement conditions or the like has been required.

Therefore, in the non-invasive blood pressure monitor of this embodiment,
The output correction means 13a calculates the amplitude Pp-p of the pulse wave from the pulse wave waveform of a certain cycle output from the waveform dividing means 16, and uses this value to calculate the magnitude of the acceleration pulse wave output from the acceleration pulse wave output means 12. Is output using the corrected value, and the blood pressure value calculating means 13d is used to estimate the blood pressure value of the subject.

Since the pulse wave signal indicates the amount of change in blood volume, its amplitude corresponds to the difference between the maximum blood volume at the time of systolic blood pressure and the minimum blood volume at the time of diastolic blood pressure. By examining what kind of pulse output the heart realizes in order to satisfy the change amount, it is possible to estimate the state of the load applied to the heart. In other words, if the heart beat output is large enough for the blood flow,
It can be said that the heart is operating with a margin for the load, and conversely, if the heart's pulse output is small with respect to the blood flow,
It can be seen that the heart is operating with no margin, and as a result, is operating so as to increase the blood pressure. In the non-invasive sphygmomanometer of the present embodiment, the absolute load value of the acceleration pulse wave output from the acceleration pulse wave output means 12 is divided by the amplitude of the pulse wave to obtain the heart load per blood change. Used for estimating blood pressure values.

In the non-invasive sphygmomanometer of the present embodiment, the maximum value of the a-wave, which is the first positive peak of the acceleration pulse wave, is divided by the amplitude of the pulse wave to be used for calculating the blood pressure value. I have. this is,
This is because the a-wave is the output at the time when the heart has the maximum pulse output immediately after the valve is opened, and is therefore most useful for evaluating the pulse output of the heart. Since the heart load can be estimated in more detail by analyzing the correction waveform in detail, it is of course possible to extract a characteristic amount other than the maximum value of the a-wave from the correction waveform and use it for estimating the blood pressure value.

In the present embodiment, as described above, the output correction means 13a uses the acceleration pulse wave height divided by the amplitude Pp-p and the acceleration pulse wave signal output from the acceleration pulse wave output means 12 to calculate statistically. The blood pressure value of the subject is calculated by substituting it into a calculation formula obtained in advance by an appropriate means. That is, the output signal of the acceleration pulse wave output means 12 is converted into a waveform synchronized with the heart beat by the waveform dividing means 16, that is, a waveform between R and R shown by the ECG in FIG. In the blood pressure value calculating means 13, the wave height calculating means 13b calculates the wave heights ha, hb, hc, hd, and he from the base line O of each of the peaks a, b, c, d, and e, and calculates the peaks. The time point calculation means 13c calculates the peak time points Ta, Tb, Tc, Td, at which the plurality of peaks have the maximum value or the minimum value.
In addition to calculating Te, the output correcting means 13a similarly divides the output waveform of the acceleration pulse wave output means 12 into the waveform dividing means 16a.
The wave height ha ′ of the a-wave is calculated from the acceleration pulse wave output corrected by dividing by the output amplitude Pp-p of the
d is the maximum blood pressure value Ph, the minimum blood pressure value Pl, by substituting the information of the peak height and the peak time of the plurality of peaks into the calculation expressions (1), (2), and (3) obtained in advance. The average blood pressure value Pa is calculated.

(1) Ph = A _h0 + A _h1 × ha ′ + A _h2 × h
b / ha + A _h3 × hc / ha + A _h4 × hd / ha + A _h5
× he + A _h6 × (Tb−Ta) + A _h7 × (Tc−Ta) + A
_{h8 × (Td-Ta) +} A h9 × (Te-Ta) (2) Pl = A l0 + A l1 × ha '+ A l2 × hb / ha + A
_{l3 × hc / ha + Al4 ×} hd / ha + A l5 × he / h
a + A ₁₆ × (Tb−Ta) + A ₁₇ × (Tc−Ta) + A ₁₈ ×
_{(Td-Ta) + A l9} × (Te-Ta) (3) Pa = A a0 + A a1 × ha '+ A a2 × hb / ha + A
_a3 × hc / ha + A _a4 × hd / ha + A _a5 × he / ha
+ A _a6 × (Tb-Ta) + A _a7 × (Tc-Ta) + A _a8 ×
(Td−Ta) + A _a9 × (Te−Ta) where A _h0 , A _h1 ... A _a9 are coefficients of a previously obtained calculation formula. In the present embodiment, these coefficients are used for the systolic blood pressure value Ph and the diastolic blood pressure value Pl of a plurality of subjects.
The blood pressure is measured by the Korotkoff method, which can be measured noninvasively, and the average blood pressure value Pa is calculated from these values using the simplified conversion formula of equation (4), and these blood pressure values and the pulse wave of the subject before and after the blood pressure values are collected. Statistically using the least squares method from the data obtained by processing.

(4) Pa = (Ph-Pl) / 3 + Pl In the above equations (1), (2) and (3), the term of the pulse height of the acceleration pulse wave is divided by the wave height ha of the a wave. Is used to calculate the blood pressure value, but this is also a method that is performed to eliminate the influence of the magnitude of the pulse wave from the waveform of the acceleration pulse wave. However, in this case, although the influence of the change in the magnitude of the pulse wave can be eliminated, it is difficult to estimate the load on the heart, and the purpose is different from the correction by the output correction means.

In this embodiment, the Korotkoff method is used as a method for measuring the blood pressure value for obtaining the calculation formula as described above. However, a catheter is inserted into a blood vessel to directly and directly measure the pressure value. Any method can be used as long as it can measure the blood pressure value with high accuracy, such as a direct method of measuring.

Since the non-invasive sphygmomanometer according to the present embodiment does not have a means for collecting an electrocardiogram, the division of the waveform by the waveform dividing means 16 corresponds to the minimum value of the pulse wave detected by the pulse wave detecting means 11. A certain point in time is obtained, and a pulse wave waveform for each beat is divided based on a point in time which is traced back by a certain time Tr from that point.

The subject's systolic blood pressure Ph, diastolic blood pressure Pl, and average blood pressure Pa thus calculated are indicated on the display 1.
4 is displayed as a numerical value and notified to the subject.

As described above, in the non-invasive sphygmomanometer of the present invention, the output correction means 13a corrects the output of the acceleration pulse wave output means 12 using the amplitude of the pulse wave. A signal corresponding to the pulse output of the heart per amplitude can be extracted, and accurate estimation of the blood pressure value can be performed by using this signal.

In the non-invasive sphygmomanometer of this embodiment, the amplitude of the pulse wave is used as the characteristic value of the pulse wave used by the output correction means 13a for correcting the output of the acceleration pulse wave output means 12. Since this value is affected by the activity of the heart near the maximum value, it may vary greatly depending on the state of physical activity, and a stable value may not be obtained. If an index indicating the magnitude of a pulse wave that is always stable is required, calculating the amount of attenuation during a certain period of time when the attenuation changes from the maximum value to the minimum value of the pulse wave and using it instead of the amplitude, Since the signal at this time is not significantly affected by the activity of the heart, a stable value can be obtained. For example, as shown on the PTG graph of FIG.
The amount of attenuation ΔP of the pulse wave during the time indicated by ΔT before the time point before Ti by the minimum value may be calculated and used for correction. In this case, in order to obtain a more stable value, the interval of ΔT is between the time when the heart valve is closed and the time when the valve is next opened, and the time ΔT starts after a lapse of a certain time after the valve is closed. It is desirable to set the time. The amount of attenuation is also an important index indicating the ease of peripheral blood flow, and is an important factor that constitutes blood pressure together with cardiac output. Therefore, this value may be directly used for estimating the blood pressure value.

In the above embodiment, the output correction means 13
Although a is provided independently of the wave height calculating means 13b, when only the wave height is corrected and used, the wave height data calculated by the wave height calculating means 13b may be corrected and output to the blood pressure value calculating means 13d. FIG. 3 shows a configuration diagram in this case.

In the above embodiment, the output correction means 13
Although a is corrected by dividing the output waveform of the acceleration pulse wave output means 12 by the characteristic amount obtained from the pulse wave, the correction method is not limited to division, and any correction can be performed using a polynomial if the correction is appropriate. It may be a method.

In the above embodiment, the pulse wave detecting means 11
Is attached to the tip of the finger to estimate the blood pressure value.However, if the pulse wave can be detected not only at the tip of the finger but also at the wrist, upper arm, ankle, earlobe, etc., the pulse wave is correlated with the blood pressure value. It is possible to take However, the finger of the hand is the most suitable for the non-invasive sphygmomanometer according to the present embodiment because it is hardly affected by body motion, easy to detect the pulse wave, and the connection status of the blood vessel from the heart. desirable.

[0036]

As described above, the non-invasive sphygmomanometer according to the first aspect of the present invention indirectly estimates the blood pressure of the human body using the acceleration pulse wave reflecting the state of the blood circulation system of the human body. Therefore, it is not necessary to apply a pressure equal to or higher than the systolic blood pressure value to the measurement unit using the cuff, and the subject does not feel pressure or discomfort due to tightening. Further, the output correction means corrects the output of the acceleration pulse wave output means using the characteristic amount determined by the output of the waveform dividing means, and in the blood pressure value calculation means, in addition to the output waveform of the acceleration pulse wave output means, the output correction means Since the blood pressure value is calculated using the corrected output, it is possible to calculate the blood pressure value accurately.

In the non-invasive sphygmomanometer according to the second aspect, the output correction means corrects the output of the acceleration pulse wave output means using the amplitude of the waveform dividing means. By calculating, it is possible to obtain the magnitude of the pulse output of the heart indicated by the acceleration excluding the influence of the pulse wave size that changes with the skin color and measurement conditions, and it is possible to accurately estimate the blood pressure value Becomes

According to a third aspect of the present invention, there is provided a non-invasive sphygmomanometer according to claim 3, wherein the output correcting means uses the amount of attenuation during a certain period of time from the maximum value to the minimum value of the output of the waveform dividing means. Since the output of the output means of the pulse wave is corrected, the acceleration is indicated by correcting the magnitude of the cardiac pulse output using the attenuation during a certain period of time during attenuation indicating the ease of blood flow in the peripheral blood vessels. It is possible to determine the magnitude of the pulse output of the heart, excluding the influence of the pulse wave magnitude that changes depending on the skin color and measurement conditions, and the pulse output of the heart blood and peripheral components that are components of blood pressure It is possible to express the ease of blood flow in a blood vessel with one index, and it is possible to accurately estimate a blood pressure value.

According to a fourth aspect of the present invention, there is provided a non-invasive sphygmomanometer according to the fourth aspect, wherein the output correcting means includes an upwardly convex waveform which is generated first when the heart valve is opened in the acceleration pulse wave output from the acceleration pulse wave output means. Since the correction is performed only on the first peak, the calculation can be reduced without substantially reducing the effect of the correction, and the blood pressure value can be accurately and easily estimated.

[Brief description of the drawings]

FIG. 1 is a block diagram of a non-invasive sphygmomanometer according to one embodiment of the present invention.

FIG. 2 shows an electrocardiogram, a pulse wave,
Waveform diagram of acceleration pulse wave

FIG. 3 is a block diagram of a non-invasive sphygmomanometer when the output correction means corrects the output of the wave height calculation means in the embodiment of the present invention.

FIG. 4 is an external view of a conventional non-invasive sphygmomanometer using a cuff.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2, 14 Display 3 Switch 4 Connector 5 Arm band tube 6 Cuff 7 Microphone 11 Pulse wave detection means 11a Light emitting element 11b Light receiving element 11c Conversion circuit 12 Acceleration pulse wave output means 13 Blood pressure value calculation means 13a Output correction means 13b Wave height Calculation means 13c Peak time point calculation means 13d Blood pressure value calculation means 15 Finger 16 Waveform division means

Claims (4)

[Claims] 1. A pulse wave detecting means for detecting a pulse wave generated by the circulation of blood in a human body and outputting a signal corresponding to the magnitude of the pulse wave, and an output signal of the pulse wave detecting means is used for detecting a pulse of the heart. Waveform dividing means for dividing into a waveform having a time corresponding to one cycle; acceleration pulse wave output means for calculating and outputting an acceleration pulse wave obtained by differentiating an output waveform of the waveform dividing means twice; Blood pressure value calculating means for calculating and outputting at least one of a systolic blood pressure value, an average blood pressure value and a diastolic blood pressure value of the human body based on the output of the acceleration pulse wave output means and information obtained from the acceleration pulse wave output means And a notifying means for notifying a subject or a third party of an output of the blood pressure value calculating means, wherein the blood pressure value calculating means uses the feature amount determined by the output of the waveform dividing means to output the acceleration pulse wave output means. Output compensation to correct output Has means, said blood pressure value calculation means noninvasive sphygmomanometer for use in the calculation of the blood pressure value the output of the output correction means as a part of the information obtained from the acceleration pulse wave output by the acceleration pulse wave output unit. 2. The non-invasive sphygmomanometer according to claim 1, wherein the output correction means extracts the amplitude of the output of the waveform dividing means as a feature quantity and corrects the output value of the acceleration pulse wave output means with the amplitude. . 3. An output correction means for extracting, as a characteristic amount, an amount of attenuation during a certain time during an attenuation period from a maximum value to a minimum value of the output of the waveform dividing means, and outputs the output of the acceleration pulse wave output means. 2. The non-invasive sphygmomanometer according to claim 1, wherein a value is corrected by the amount of attenuation. 4. An output correcting means, comprising: an output of the acceleration pulse wave output means, which is an upwardly convex first generated when a heart valve is opened.
4. The non-invasive sphygmomanometer according to claim 2, wherein the correction is performed only on the peak of the blood pressure.