JPH07236617A - Sphygmomanometry device - Google Patents

Abstract

PURPOSE:To easily judge the suitability of a measuring condition in a sphygmomanometry device adapted to decide the blood pressure value according to the change of smoothed amplitude value string. CONSTITUTION:A picked amplitude value string R and a smoothed amplitude value string S are superposed and displayed on a pulsation change display part 44 of a recording sheet 42 or the like (that is, on one two-dimensional diagram taking the cuff pressure as a first axis and amplitude value as a second axis) and a correction factor C is displayed on a measuring condition display part 46 in a lateral line of a length corresponding to the value by a display device. In the pulsation change display part 44, the picked amplitude value string is displayed in a longitudinal line, the smoothed amplitude value string is displayed in a polygonal line, an area S formed between the envelope of the longitudinal line and the polygonal line according to a difference between both amplitude value strings is painted black, and further the cuff pressure corresponding to the highest blood pressure value and the lowest blood pressure value is indicated by a black triangle and a white triangle near the first axis. On the other hand, a measure showing the suitability of a measuring condition is described on the measuring condition display part 46.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a blood pressure measuring device for automatically measuring and displaying a blood pressure value.

[0002]

2. Description of the Related Art A heartbeat synchronizing signal wave generated from an artery as the pressure of a cuff against an artery of a living body is changed is sampled, and an amplitude value of the heartbeat synchronizing signal wave is determined, respectively, and a series of them is arranged in the order of occurrence. A so-called oscillometric blood pressure measuring method is known in which a blood pressure is determined by creating a sequence of amplitude values and determining a blood pressure value based on a change in the sequence of amplitude values. For example,
Japanese Patent Publication No. 2-2561 filed earlier by the applicant
An example thereof is the measuring method of the blood pressure measuring device disclosed in JP-A-0. In this blood pressure measuring device, a blood pressure value is measured according to the blood pressure determination algorithm, while a two-dimensional chart including a first axis having a variable of the compression strength of the cuff and a second axis having a variable of the amplitude value. Since the above amplitude value sequence is displayed on the display, the occurrence of measurement error due to external factors such as the body movement of the person being measured during blood pressure measurement and noise from peripheral devices, etc. Can be easily determined, and the suitability of the measurement state can be determined.

[0003]

By the way, the amplitude value sequence displayed on the two-dimensional diagram forms a complex envelope due to the external factors. Therefore, there is a problem that sufficient blood pressure measurement accuracy cannot be obtained even when the external factor is not large enough to be unsuitable for blood pressure measurement. Therefore, various smoothing processes have been conventionally performed to smooth the envelope of the amplitude value sequence when measuring the blood pressure value. For example,
Japanese Patent Application Laid-Open No. 63-518 filed by the present applicant and filed previously
The blood pressure measuring method disclosed in Japanese Patent No. 37, etc. is one example. In this blood pressure measurement method, an odd number of amplitude values are sequentially selected from the amplitude value sequence, and the intermediate value of the magnitudes of the odd number of amplitude values is set to the amplitude value located at the center of the amplitude values. Since the envelope is smoothed by a so-called median filter, which is replaced with, the blood pressure can be easily determined and sufficient blood pressure measurement accuracy can be obtained.

However, in the conventional blood pressure measuring device,
Even if the amplitude value is displayed on the display as the two-dimensional diagram,
As described above, since the envelope is smoothed and the error of the amplitude value due to the external factor is already corrected, it is not possible to accurately grasp the adequacy of the measurement state depending on the distribution state of the amplitude value as described above. There was a problem.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a blood pressure measuring device for determining a blood pressure value based on a change in the smoothed amplitude value sequence as described above. The purpose is to make it possible to easily determine whether or not the measurement state is appropriate.

[0006]

[Means for Solving the Problems] In order to achieve such an object, the gist of the first invention is that it is generated from an artery of a living body as the pressure of the cuff against the artery is changed. A heartbeat synchronization signal wave is sampled, an amplitude value of the heartbeat synchronization signal wave is determined, and an amplitude value sequence that is continuous in the order of occurrence is created, and after the amplitude value sequence is smoothed, the smoothed amplitude value sequence A blood pressure measurement method for determining a blood pressure value based on a change in size, (a) a display having a display surface in which pixels are arranged two-dimensionally, (b) the collected amplitude value sequence And a display control means for displaying the smoothed amplitude value sequence on the display surface of the display in a state of being overlapped with each other.

[0007]

With this arrangement, the sampled amplitude value sequence and the smoothed amplitude value sequence are displayed on the two-dimensional diagram on the screen of the display. Therefore, the smoothed amplitude value changed from the sampled value can be clearly visually recognized as a difference from the sampled amplitude value on the two-dimensional diagram. Therefore, the relationship between the difference between the two amplitude values, that is, the magnitude of the external factor such as the body movement and the noise of the peripheral device, and the position in the first axis direction on the two-dimensional diagram where the difference occurs, that is, the compression strength. Based on the above, whether or not a large error has occurred in the blood pressure measurement value due to the external factor, that is, the adequacy of the measurement state can be easily determined.

[0008]

In order to achieve the above-mentioned object, the gist of the second invention is that the arteries of a living body are changed from the arteries as the compression strength of the cuff is changed. The generated heartbeat synchronization signal wave is sampled, the amplitude value of the heartbeat synchronization signal wave is determined, and an amplitude value sequence that is continuous in the order of occurrence is created, the amplitude value sequence is smoothed, and then the smoothed amplitude value A blood pressure measurement device for determining a blood pressure value based on a change in the size of a row, (a) a display for displaying the measurement state when the blood pressure value is determined,
(b) In a predetermined pressure range of a predetermined cuff, a difference between the collected amplitude value sequence and the smoothed amplitude value sequence, the collected amplitude value sequence and the smoothed amplitude value sequence A correction rate calculating means for calculating a correction rate which is a ratio to one of the above, and (c) based on the correction rate calculated by the correction rate calculating means, the measurement state when the blood pressure value is determined is displayed. Display control means for displaying on the container.

[0009]

In this way, the degree of correction of the smoothed amplitude value sequence used to determine the blood pressure value from the sampled amplitude value sequence, that is, the correction rate, is the smoothing effect. Calculated based on the difference between the sampled amplitude value sequence and the sampled amplitude value sequence and the ratio of one of the sampled amplitude value sequence and the smoothed amplitude value sequence, and based on this correction rate The measurement status is displayed on the display. That is, the measurement state when the blood pressure value is measured is displayed in a state where it can be easily visually recognized. Therefore, by comparing the correction rate, that is, the magnitude of the external factors such as the body movement and the noise of the peripheral device with a predetermined determination reference value, the blood pressure measurement value becomes large due to the external factors. Whether or not an error has occurred, that is, suitability of the measurement state can be easily determined.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of an example of an automatic blood pressure measuring device to which the present invention is applied. The cuff 1 is provided with an inflatable bag wound around the upper arm of a living body to compress it.
A pressure sensor 12, a rapid exhaust valve 14, a slow exhaust valve 16, and an air pump 18 are connected to 0 via a pipe 20. The pressure sensor 12 detects the pressure in the cuff 10, and supplies a pressure signal SP representing the pressure in the cuff 10 to the cuff pressure detection circuit 22 and the pulse wave detection circuit 24.
The cuff pressure detection circuit 22 includes a low-pass filter for extracting the actual pressure of the cuff 10, which is its static pressure component, that is, the cuff pressure from the pressure signal SP, and the cuff pressure signal S
K is supplied to the control circuit 28 via the A / D converter 26. Further, the pulse wave detection circuit 24 includes a bandpass filter for extracting a pulse wave, which is a vibration component synchronized with the heartbeat, from the pressure signal SP, and controls the pulse wave signal SM via the A / D converter 26. Supply to the circuit 28.

The control circuit 28 includes a CPU 30 and a ROM 3
2, a so-called microcomputer including a RAM 34 and an output interface 36, and the CPU 30 is a RAM 3
The input signal is processed in accordance with a program stored in advance in the ROM 32 while using the temporary storage function of No. 4, and the drive signals are supplied to the quick exhaust valve 14, the slow exhaust valve 16 and the air pump 18, respectively, The signal representing the blood pressure value determined by executing the algorithm, the suitability signal representing the suitability of the measurement state, and the signal representing the amplitude value sequence of the pulse wave are two-dimensionally displayed on an image display device such as a liquid crystal display panel or a printer. Display 3 having a display surface on which pixels are arranged
8 and the like to display the blood pressure value, the adequacy of the measurement state, and the amplitude value sequence. The start push button 40 is operated to start blood pressure measurement.

In the automatic blood pressure measuring device configured as described above, the blood pressure value is automatically measured by executing a series of blood pressure measuring steps as shown in FIG. That is, it is determined whether or not the start push button 40 is operated in step S1. Start push button 4
When it is not determined that 0 has been operated, it is made to wait, but when it is determined that it has been operated, step S2 is executed, the quick exhaust valve 14 and the slow exhaust valve 16 are closed, and the air pump 18 is turned on. When driven, the pressure increase of the cuff 10 is started. In step S3, it is determined whether the pressure Pc in the cuff 10 is equal to or higher than a predetermined target pressure Pm. This target pressure Pm is a pressure sufficiently higher than the systolic blood pressure of the subject, for example 180
It is set to about mmHg. While the determination of step S3 is denied, the pressure increase of the cuff 10 is continued, but step S3
If the determination in step 3 is affirmative, step S4 is executed to stop the drive of the air pump 18 and the slow exhaust valve 16
Is opened, the pressure reduction of the cuff 10 is started. In this step-down process, the cuff 1 is pressed at a speed of 2 to 3 mmHg / sec.
The pressure of 0 is gradually changed, and the blood pressure value is determined by repeatedly executing the blood pressure value determination routine of step S5 during this period.

In step S5, the amplitude value sequence R of the pulse wave continuously generated is obtained by repeatedly executing the subroutine shown in FIG. 3 every relatively short period, for example, every 4 ms.
Is pre-processed, and the blood pressure determination algorithm is executed based on the series of amplitude values R consecutive in this order of occurrence to determine the blood pressure value. That is, step SS1
Then, it is determined whether or not a pulse wave that can be used for measurement is generated based on the pulse wave signal SM sequentially supplied from the A / D converter 26 at a predetermined sampling period. The occurrence of this pulse wave is detected, for example, by the occurrence of an upper peak and a lower peak. When the generation of the pulse wave is detected in this manner, the peak value of the pulse wave, that is, the amplitude value R _i from the upper peak to the lower peak is calculated in step SS2, and the subsequent step SS3 (abnormal value determination step or abnormality). The value determining means) determines whether the amplitude value R _i is abnormal. This abnormality determination is made by showing a physiologically impossible change in the amplitude value R _i-1 of the previous pulse wave. For example, the amplitude value R of the current pulse wave
_{When i} is ½ or less and 4 times or more of the amplitude value R _i-1 of the previous pulse wave in the state before the average blood pressure, or when the amplitude value R _{i- of the} previous pulse wave in the state after the average blood pressure. It is judged to be abnormal when it is 1/2 or less and 1.5 times or more than ₁ .

In step SS3, the pulse wave of this time
Amplitude value R_iIf it is determined that the
Up to SS1 and below are executed again, but it is judged that it is not abnormal
If so, step SS4 is executed and the above amplitude is
Value R_iIs stored together with the cuff pressure value at that time. That
Then, in step SS5, the pulse wave this time is a pulse with an abnormal amplitude.
It is judged whether it is the second normal pulse wave that follows the wave.
It If the determination in step SS5 is negative, step
If SS6 is not executed, but is affirmed, step SS6 is executed.
(Linear interpolation process) is executed so-called amplifier filter processing
Is done. This amplifier filter processing is performed by, for example, the above-mentioned
What is disclosed in JP-A-63-51837
Then, all the amplitude values R of the above-mentioned abnormal amplitude pulse wave_in・ ・ ・
., R_i-2, R _i-1Just before the abnormal amplitude is detected
Amplitude value R of normal pulse wave_in-1And the second normal pulse wave
Amplitude value R_iIs used for linear interpolation.

Subsequent steps SS7 and SS8
Then, the so-called median process is applied to the pulse wave train that has been subjected to the amplifier filter process as described above to be smoothed. This median processing is also described in, for example, the above-mentioned JP-A-63.
No. 51837, the new pulse wave (R _{i + 2} ) stored in this cycle is stored.
Amplitude values R _i-2 , R _i-1 , R _i , R of an odd number of pulse waves, for example, five, which are adjacent to each other before
_{i + 1} and R _{i + 2} are selected in step SS7 (selection step or selection means), and their amplitude values R _i-2 , ... In step SS8 (replacement step or replacement means).
.., an intermediate value of R _{i + 2} (that is, the number of selected pulse waves is 5
In this case, the third largest amplitude value R _j ) or the smallest amplitude value R _j is the amplitude value S _i of the pulse wave located at the center of the pulse wave train. That is, in the present embodiment, the sampled amplitude values R _i are smoothed by the smoothing process or the above-described amplifier filter processing and median processing (steps SS5 to SS8) as a smoothing means. In addition,
The number of continuous pulse waves selected in the median process may be about 3 or 7 as long as it is an odd number.

When the sampled amplitude values R _i have been smoothed by the smoothing step, a blood pressure determination algorithm for determining the systolic blood pressure value and the diastolic blood pressure value in step SS9 is executed. This blood pressure determination algorithm needs the cuff pressure stored in the amplitude value sequence S that has been subjected to the amplifier filter process and the median process, for example, corresponding to the abrupt change in the amplitude value S _i. According to the above, it is determined and stored as the systolic blood pressure value and the diastolic blood pressure value by correcting the mutual relationship and the relationship with the mean blood pressure value. As is apparent from the above description, in the present embodiment, when determining the blood pressure value, the pulse wave as the heartbeat synchronizing signal wave, that is, the cuff 10 that compresses a part of the living body is synchronized with the heartbeat. The generated pressure oscillation wave is used.

Returning to FIG. 2, after the blood pressure value determination routine of step S5, step S6 is executed to determine whether or not the blood pressure value has been determined. At the beginning of the cuff pressure drop,
Since the amplitude value sequence S is not sufficiently formed, the blood pressure value cannot be determined even when the blood pressure determination algorithm of step SS9 is executed, and the blood pressure value determination routine of step S5 and the subsequent steps are repeatedly executed. However, when the blood pressure value is determined by the execution of the blood pressure determination algorithm in step SS9 among the repeated steps S5 and subsequent steps, the determination in step S6 is affirmative and steps S7 and subsequent steps are executed.

In step S7, the quick exhaust valve 14
Is activated to rapidly exhaust the air in the cuff 10 to release the compression, and in the correction rate calculation step or the correction rate calculation means, steps S8 to S10, the smoothing used for determining the blood pressure value is performed. The degree of correction of the amplitude value sequence S from the sampled amplitude value sequence R, that is, the correction rate C is calculated. In step S8 corresponding to the total difference calculating means,
The sum SD of the absolute values of the differences between the sampling amplitude value R _i and the smoothed amplitude value S _i corresponding to each cuff pressure within a predetermined range of the cuff pressure is calculated according to the following equation (1). As the predetermined range of the cuff pressure, for example, a wide range of one pulse wave on both sides of the cuff pressure determined as the systolic blood pressure value and the diastolic blood pressure value in step SS9 which is the blood pressure determination algorithm is used. In step S9 corresponding to the subsequent smoothed amplitude value total calculation means, the sum SS of the smoothed amplitude values S _i within the predetermined range of the cuff pressure is the following (2).
Calculated according to the formula. Then, in step S10 corresponding to the ratio calculating means, when the correction rate C is calculated according to the following equation (3) as a percentage of the sum SD of the absolute values of the differences with respect to the summed smoothed amplitude value SS, the process proceeds to step S11. . That is, in the present embodiment, the above step S8
Through S10 correspond to the correction rate calculation means.

[0020]

[Number 1] _{SD = Σ | S i -R i} | ··· (1) SS = ΣS i ··· (2) C = (SD / SS) × 100 ··· (3)

The sum SD of the absolute values of the differences corresponds to the sum of the areas A shown by the diagonal lines in FIG. 4, and the smoothed amplitude value S _i
4 corresponds to the area surrounded by the polygonal line and the base line indicating the smoothed amplitude value sequence S in FIG. Therefore, the correction rate C corresponds to the ratio of the two areas.

In step S11 corresponding to the display control means, the systolic blood pressure value, the diastolic blood pressure value, the pulse rate and the like are displayed by the display device 38 or another display device not shown, while the display device 38 displays, for example, FIG. As shown in FIG. 2, the collected amplitude value sequence R is displayed on the pulsation change display portion 44 of the recording paper 42 or the like (that is, on one two-dimensional diagram with the cuff pressure as the first axis and the amplitude value as the second axis). The above-mentioned smoothed amplitude value sequence S is displayed in an overlapping manner, and, for example, the measurement state display section 46 provided side by side with the pulsation change display section 44 is provided.
In addition, the correction rate C is displayed as a horizontal line having a length corresponding to the value. In the pulsation change display section 42, the sampling amplitude value sequence R is displayed as a vertical line and the smoothed amplitude value sequence S is displayed as a polygonal line, and the envelope and the polygonal line of the vertical line are displayed due to the difference between the two amplitude value columns. The area A formed between and is filled with black, and the cuff pressures corresponding to the systolic blood pressure value and the diastolic blood pressure value determined by the blood pressure value determination algorithm are ▲ and △ near the first axis. It is indicated by a mark. Further, in the above-mentioned measurement state display section 46, a guideline "small noise", "normal", and "large noise" indicating whether or not the measurement state is appropriate, that is, the magnitude of an external factor (noise) is written in advance. The state of measurement can be determined by comparing the tip of the horizontal line of the rate C with the above standard. In the above standard, “normal” corresponds to a correction rate C = about 5%, and “large noise” corresponds to a correction rate C = 9%. Further, as is clear from the above description, in this embodiment, the control circuit 28 corresponds to the display control means.

As described above, according to this embodiment, the step
In S11, the sampling amplitude value sequence R and the smoothed amplitude value sequence S
On one of the two-dimensional diagrams on the display 38 (ie
Since it is displayed overlaid on the display unit 44),
Amplitude value S changed from the sampled value_iIs that
Amplitude value R sampled on a two-dimensional diagram_iDifference with _i
Can be clearly seen. Both amplitude values R_i, S_iDifference D
_iIs an external factor such as body movement of the person being measured or noise of peripheral equipment.
Is increased by the
Width value R_i, S_iDifference D_iAnd the difference D_iOccurs
Position in the first axis direction on the two-dimensional diagram, that is, the cuff pressure
The external blood pressure may affect the blood pressure measurement value based on the relationship with
It can be easily determined whether a large error has occurred, and the measurement
The suitability of the state can be easily determined. For example, in Figure 4
The maximum and minimum blood pressure values displayed with ▲ and △
Within the range of the cuff pressure corresponding to, the smoothed amplitude value sequence S
Is greatly corrected, the total difference S with the sampling amplitude value sequence R is
When D is large, the amplitude value sequence R receives a large external factor.
The blood pressure is not measured accurately and the measurement condition is not correct.
It is easy to judge that

Further, in this embodiment, the sampling amplitude value sequence R is displayed as a vertical line and the smoothed amplitude value sequence S is displayed as a polygonal line, and the envelope D and the polygonal line of the vertical line are represented by the difference D between the two amplitude value sequences. Since the area A formed between and is blacked out, the size of the total difference SD of both amplitude value columns can be more easily visually recognized.

Further, in the present embodiment, the correction rate C (that is, the sampling amplitude value string R is smoothed as the ratio of the sum of the area A to the area surrounded by the polygonal line and the base line representing the smoothed amplitude value string S). A value indicating the degree of correction at the time) is calculated and displayed on the measurement state display unit 46 as a horizontal line. Therefore, it is possible to easily visually check the ratio of correction to the pulsation value, and a large error occurs in the blood pressure measurement value due to external factors based on the correction level. Whether or not it is, that is, the suitability of the measurement state can be easily determined. Moreover, as described above, the measurement status display section 46 displays “small noise” as a guide for indicating the measurement status.
Since "ordinary" or the like is written, even if the measurer is not an expert, it is possible to more easily determine the suitability of the measurement state based on this standard. For example, if the tip of the horizontal line indicating the correction rate C is on the left side of “normal”, that is, if the correction rate C is 5% or less, it can be determined that proper blood pressure measurement has been performed. As is apparent from the above description, in the present embodiment, the horizontal line of the length corresponding to the value of the correction rate C is displayed side by side as a guide indicating the measurement state,
The measurement state is displayed based on the correction rate C.

5 to 8 show the beat change display section 4 described above.
4 is an example of another display format of No. 4. In FIG. 5, the smoothed amplitude value S is displayed in the same manner as in FIG. 4, but the sampling amplitude value R is displayed in a polygonal line similar to the smoothed amplitude value S instead of the vertical line. The area A formed between the polygonal lines due to the difference D is not filled. Even in this case, the sampling amplitude value R _i on the two-dimensional diagram
The difference D _i between the smoothed amplitude value S _i is obtained is clearly visible and,
Based on the relationship between the magnitude of the difference D _i between the two amplitude values and the position of the difference in the first axis direction on the two-dimensional diagram, whether or not a large error has occurred in the blood pressure measurement value due to an external factor. That is, the suitability of the measurement state can be easily determined.

Further, according to this display format, two lines are displayed in the portion changed from the amplitude value R _i sampled by the smoothing process, but only one line is not changed. Is displayed, the magnitude of the difference D _i between the two amplitude values can be easily visually recognized as in the case of FIG.

In the display format shown in FIG. 6, both amplitude value trains R and S are represented by vertical bars, and the area A corresponding to the difference between the smoothed amplitude value S _i and the sampling amplitude value R _i and the vertical bar. The other part is displayed in a different color (for example, a light color and a dark color, or a different pattern). Even in this case, the difference D between the sampled amplitude value R _i and the smoothed amplitude value S _i on the two-dimensional diagram
_i can be clearly recognized, and based on the relationship between the magnitude of the difference D _i between the two amplitude values and the position of the difference D _i in the first axis direction on the two-dimensional diagram, an external factor causes Whether or not a large error has occurred in the blood pressure measurement value, that is, whether or not the measurement state is appropriate can be easily determined.

In the display format shown in FIG. 7, one (Fig.
In the case where the smoothed amplitude value sequence S) is shown by a polygonal line,
On the other hand, the other (sampled amplitude value sequence R in the figure) is displayed as a vertical bar.
Has been done. Even in this way, on the two-dimensional diagram
A vertical bar lower than the position of the line or a position lower than the position of the line
Sampling due to the presence of tall vertical bars and the size of the difference in height
Amplitude value R_iAnd the smoothed amplitude value S_iIs clearly visible
Obtained, the difference D of both amplitude values _iAnd the difference D_iOccurs
Based on the relationship with the position in the direction of the first axis on the existing two-dimensional diagram
However, external factors cause large errors in blood pressure measurement values.
Whether or not the measurement status is correct is easily determined.
Can be

In the display format shown in FIG. 8, one is a vertical line and the other is a broken line as in FIG. 4, but the area A caused by the difference D between the two amplitude values is not displayed. Even in this case, as in the case of FIG. 7, due to the presence of a vertical line lower than the position of the broken line or a vertical line higher than the position of the broken line on the two-dimensional diagram, and the size of the difference in height, The difference D _i between the sampled amplitude value R _i and the smoothed amplitude value S _i can be clearly seen, and the magnitude of the difference D _i between the two amplitude values and the first axis on the two-dimensional diagram in which the difference occurs Based on the relationship with the position in the direction, whether or not a large error has occurred in the blood pressure measurement value due to an external factor, that is, whether or not the measurement state is appropriate can be easily determined.

Also in the display formats of FIGS. 5 to 8, the cuff pressures corresponding to the systolic blood pressure value and the diastolic blood pressure value are
Since the ▲ and △ marks are displayed near the first axis, the range of the cuff pressure to be used for judging the adequacy of the measurement state (for example, as in the above-mentioned embodiment, the cuff pressure corresponding to the systolic blood pressure is the lowest). (Up to the cuff pressure corresponding to the blood pressure value) can be easily determined.

5 to 8, the measurement state display section 46 is not particularly shown, but it may be provided in the same manner as in FIG. 4 or may not be provided on the contrary. Alternatively, the adequacy of the measurement state may be displayed by a display provided separately in the automatic blood pressure measurement device.

FIG. 9 shows another method of displaying the recording paper 42 by the display 38. The pulsation change display section 44 is not provided, but only the measurement state display section 46 for displaying the correction rate C is provided. Has been. Further, the correction rate C is displayed not by the horizontal line used in FIG. 4 but by a numerical value, and “3 or less: small noise” and “3” are displayed below the number indicating the correction rate C on the measurement state display unit 46. "~ 6: Normal", "6 or more: large noise (remeasurement required)" are displayed as a criterion for determination. Even in this case, whether or not a large error has occurred in the blood pressure measurement value, that is, whether or not the measurement state is appropriate can be easily determined based on external factors.

In addition to directly displaying the value of the correction rate C as described above, the suitability of the measurement state can be obtained by, for example, recording paper 4 or the like.
For example, “small noise” or “large noise” may be displayed on the measurement state display section 46 such as 2 according to the magnitude of the correction rate C. In the above case, between the steps S10 and S11 in the flowchart of FIG.
As shown in FIG. 5, step S12 corresponding to the comparison / determination means for comparing the correction rate C with a predetermined determination reference value (for example, two numerical values 3 and 6 corresponding to “normal” and “large noise”, respectively), and Step S13 corresponding to display content selection means for selecting the content to be displayed on the measurement state display unit 46 according to the determination of the comparison determination means is provided.
In 11, the measurement state is displayed instead of the correction rate. When it is determined that C <3 in step S12, the process proceeds to step S13a, and M is “small noise”.
Is stored, and if 3 ≦ C <6, step S13b
If “normal” is stored in M and C ≧ 6, go to
In step S13c, "large noise" is stored in M. Then, in step S11 corresponding to the display control means, the content of M is output as the measurement state. In addition, in the above description, the measurement state is displayed by a phrase such as “small noise”, but instead of the display by the phrase, a display lamp or the like separately provided in the automatic blood pressure measurement device is used to display the value of the correction rate C. It may be displayed by turning it on.

Although one embodiment of the present invention has been described above with reference to the drawings, the present invention can be applied to other modes.

For example, in the above-mentioned embodiment, the pulse wave is used as the heartbeat synchronizing signal wave, but the pulse sound (Korotokov sound) generated from the artery when a part of the living body is compressed.
May be used as the heartbeat synchronizing signal wave.

Further, in the above embodiment, the amplitude value R
An abnormal value determination step of sequentially comparing whether or not _i exceeds a predetermined fixed determination reference range, and determining an abnormal value when the amplitude value R _i exceeds the determination reference range, and the abnormal value An amplifier filter process including an interpolation step of inserting a value that replaces the abnormal value by interpolating between the sandwiched normal values, and an odd number of series of amplitude values R _i-2 , R in the amplitude value sequence R
_i−1 , R _i , R _{i + 1} , R _{i + 2} are sequentially selected, and the intermediate value R _j of the magnitude among the odd number of amplitude values selected in the selection step is set to the odd number. The smoothing step or the smoothing means is composed of a median process including a replacing step of replacing the amplitude value R _i located at the center of the series of amplitude values of Any can be used. For example, only one of the amplifier filter process and the median process is used, and in the subroutine shown in FIG.
A subroutine in which S3 and SS5 to SS6 are omitted may be used, or conversely, steps SS7 to SS
A subroutine in which 8 is omitted may be used. Further, instead of step SS8, a process of replacing the average value may be performed. In any case, if any smoothing process is performed when determining the blood pressure measurement value, the sampled amplitude value sequence R and the smoothed amplitude value sequence S are overlaid and displayed on one two-dimensional diagram. Alternatively, by displaying the measurement state based on the correction rate C, the effect of the present invention that the suitability of the measurement state can be easily determined can be sufficiently obtained.

The display format for displaying both amplitude value sequences R and S is that the smoothed amplitude value sequence S and the sampled amplitude value sequence R are opposite to each other in the respective embodiments shown in FIGS. 4 to 8. It may be a format. Further, even if a picture or a symbol (for example, "★" or "*") is used instead of the vertical line or the vertical bar, the same effect as that of the embodiment can be obtained. Also,
In the embodiment of FIG. 4, the area A may not be filled, and only the polygonal line, the vertical line, and the envelope of the vertical line may be displayed, or in the embodiment of FIG. 5, the area A may be filled. good. Further, in any case, as a method for facilitating the visual recognition of the area A, the same effect as that of the embodiment can be obtained even if various things such as a diagonal line and a grid are used in addition to blackening the entire surface. can get.

Further, in FIG. 4 and FIG. 6, the area A is similarly filled when the smoothed amplitude value S _i is larger or smaller than the sampling amplitude value R _i, but the smoothed amplitude value S _i is Different diagonal lines may be inserted to show the magnitude of the sampling amplitude value R _i .

Further, only one of the sampling amplitude value sequence R and the smoothed amplitude value sequence S is displayed on the pulsation change display section 44 or the correction rate C is displayed on the measurement state display section 46. May be. If at least one is displayed, the magnitude of the error in the blood pressure measurement value due to external factors, that is, the suitability of the measurement state can be easily determined based on the display, and the effect of the present invention can be obtained. If the modification rate C is not displayed, steps S8 to S10 are not executed in the flowchart shown in FIG.

Further, in the above embodiment, the correction rate C
Was calculated as the ratio SD / SS of the sum SD of the absolute values of the differences and the total sum SS of the smoothed amplitude values, but may be calculated as the ratio SD / SR of the SD and the total sum SR of the sampling amplitude values. . Further, it may be calculated by an equation in which the denominator and the numerator are replaced in these equations. In these cases, the standard or judgment reference value for determining the adequacy of the measurement state is appropriately changed.

Further, the predetermined range of the cuff pressure for calculating the correction rate C can be changed appropriately. For example, the sampling amplitude value R
_It may be calculated based on the range of all the cuff pressures in which _i exists, that is, all the amplitude value sequences R and S, and conversely, a comparison centering on the amplitude values corresponding to the systolic blood pressure value and the diastolic blood pressure value. There may be two narrow ranges. Also in these cases, the standard or the judgment reference value for determining the suitability of the measurement state is appropriately changed.

Further, in the above-mentioned embodiment, the display 3
Although the case of displaying on the recording paper 42 by 8 has been described, even when an image display device such as a liquid crystal display panel is used as the display device 38, one or both of the pulsation change display portion 44 and the measurement state display portion 46 are displayed. By being provided, a similar type of display may be provided.

Although not illustrated one by one, the present invention can be variously modified without departing from the spirit of the invention.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an example of an automatic blood pressure measurement device to which the present invention is applied.

FIG. 2 is a flowchart explaining the operation of the automatic blood pressure measurement device of FIG.

FIG. 3 is a flowchart illustrating an operation of the automatic blood pressure measurement device of FIG.

FIG. 4 is a pulsation change (that is, a sampling amplitude value and a smoothed amplitude value) output to a display according to the flowchart of FIG.
FIG. 6 is a diagram illustrating a display format of a measurement state.

FIG. 5 is a diagram illustrating another display format of the sampling amplitude value and the smoothed amplitude value, which is a diagram corresponding to FIG. 4;

FIG. 6 is a diagram illustrating another display format of the sampling amplitude value and the smoothed amplitude value, which is a diagram corresponding to FIG. 4;

FIG. 7 is a diagram for explaining another display format of the sampling amplitude value and the smoothed amplitude value, which is a diagram corresponding to FIG. 4;

8 is a diagram for explaining another display format of the sampling amplitude value and the smoothed amplitude value, which is a diagram corresponding to FIG. 4. FIG.

FIG. 9 is a diagram illustrating another display mode of the display device.

FIG. 10 is a flowchart in the case of displaying a phrase indicating a measurement state instead of the correction rate.

[Explanation of symbols]

 28: Control circuit (display control means) 38: Display

Claims (2)

[Claims] 1. A heartbeat synchronizing signal wave generated from the artery as the cuff compressive strength against an artery of a living body is changed is sampled, and an amplitude value of the heartbeat synchronizing signal wave is determined, and the amplitudes are consecutive in the order of occurrence. A blood pressure measuring device that creates a value sequence, smoothes the amplitude value sequence, and then determines a blood pressure value based on a change in the size of the smoothed amplitude value sequence, wherein pixels are two-dimensionally An indicator having an arrayed display surface, the sampled amplitude value sequence and the smoothed amplitude value sequence,
A blood pressure measurement device, comprising: display control means for displaying the display on the display surface of the display in a state where they are overlapped with each other. 2. A heartbeat synchronizing signal wave generated from the artery as the pressure of the cuff on the artery of the living body is changed is sampled, and an amplitude value of the heartbeat synchronizing signal wave is determined to be continuous in the order of occurrence. A blood pressure measuring device that creates a value sequence, smoothes the amplitude value sequence, and then determines a blood pressure value based on a change in the size of the smoothed amplitude value sequence, wherein the blood pressure value is determined. An indicator for displaying the measurement state at the time of measurement, and the difference between the sampled amplitude value sequence and the smoothed amplitude value sequence in the pressure range of a predetermined cuff that has been determined in advance. A correction rate calculating means for calculating a correction rate, which is a ratio to one of the amplitude value sequence and the smoothed amplitude value sequence, and the blood pressure value is determined based on the correction rate calculated by the correction rate calculating means. Is displayed on the display. A blood pressure measurement device, comprising: