JP2009233012A - Blood measuring device and sound output device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To relieve the stress on a measuring person in the process of increasing the cuff pressure. <P>SOLUTION: In the sphygmomanometer, Korotkoff sound is detected by a microphone set in a cuff. Under the situation of reducing the cuff pressure at a fixed speed after the increase of the cuff pressure to the pressure PM, the systolic pressure and the diastolic pressure of the measuring person are determined based on the volume of the Korotkoff sound. In the period till the cuff pressure is increased to the pressure PM, the announcement sound is output from a speaker at the volume corresponding to the volume of the Korotkoff sound. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blood pressure measurement device, and more particularly to a blood pressure measurement device and an audio output device that can relieve stress of a measurer during blood pressure measurement.

  When blood pressure measurement is performed, generally, measurement is performed by wrapping a cuff around a predetermined portion such as an upper arm portion of the measurer and changing the pressure in the cuff (hereinafter referred to as “cuff pressure”). Specifically, for example, in the electronic sphygmomanometer disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 6-133939), the cuff pressure is first increased to a predetermined pressure, and the pulse pressure is gradually decreased while the cuff pressure is gradually decreased. By continuously detecting the change in the wave amplitude, the systolic blood pressure and the minimum blood pressure of the measurer are sequentially determined, and the average blood pressure is calculated.

  In the electronic sphygmomanometer disclosed in Patent Document 1, a technique focusing on the time required for blood pressure measurement is disclosed as a technique for reducing stress of the measurer. Specifically, in an electronic sphygmomanometer, based on the blood pressure information of the measurer estimated during pressurization, the time from the start of decompression to the end of decompression is predicted, and the remaining time is indicated to the measurer by segment display etc. A technique to be notified is disclosed.

In addition, in the blood pressure measurement device capable of performing conventional automatic measurement, the above-mentioned “predetermined pressure”, which is the target for increasing the cuff pressure, is, for example, from the change in the pulse of the measurer obtained during the cuff pressure increase, Some of them can be controlled to be optimally set for each measurer (for example, a pressure obtained by adding 30 mmHg to the maximum blood pressure). Such control is performed in order to avoid applying unnecessary stress to the measurer by increasing the cuff pressure to an unnecessarily high pressure when a measurer with a relatively low blood pressure measures the blood pressure. .
Japanese Patent Laid-Open No. 6-133938

  As described above, in Patent Document 1, the time from the start of decompression to the end of decompression is predicted and notified after pressurization is completed, but the stress felt by the measurer is in the decompression process of the cuff pressure. Rather, the one in the process of increasing the cuff pressure before that is considered to be larger. The fear that the measurer feels at the cuff attachment site increases due to the increase in cuff pressure, and the stress during measurement can be predicted by the fact that the high blood pressure level can be roughly predicted by the high pressure level. It depends on the reason for receiving it. It can be easily predicted that such stress may lead to an increase in blood pressure during measurement.

  From this point of view, it has been necessary to examine the relaxation of the measurer's stress in the process of increasing the cuff pressure.

  The present invention has been conceived in view of such circumstances, and an object of the present invention is to provide a blood pressure measurement device and a sound output device that can relieve the stress of the measurer in the cuff pressure increasing process in blood pressure measurement. is there.

  An apparatus for measuring blood pressure according to the present invention is a fluid bag included in a cuff that is attached to a predetermined part of a living body and compresses an artery, and is an internal pressure of the fluid bag that is supplied with fluid and inflates. The cuff pressure control means for controlling the cuff pressure, the pulse wave information extraction means for extracting pulse wave information from the volume change of the artery caused by being compressed by the cuff, and the cuff pressure control means Output means for outputting sound during a period when the cuff pressure is increased, and the sound output by the output means is changed in accordance with a change in numerical value obtained from the pulse wave information extracted by the pulse wave information extraction means. And an output control means.

  In the blood pressure measurement device of the present invention, the pulse wave information extracted by the pulse wave information extraction unit is a Korotkoff sound, and the output control unit is a volume of the Korotkoff sound, which is a numerical value obtained from the pulse wave information. It is preferable to control the volume of the sound output by the output means in accordance with the change in the sound.

  In the blood pressure measurement device of the present invention, the output control means calculates a pulse wave amplitude from the pulse wave information, and controls the volume of the sound output by the output means according to the change in the pulse wave amplitude. It is preferable.

  In the blood pressure measurement device of the present invention, it is preferable that the output control means changes the volume of the sound output from the output means in accordance with a change in a numerical value obtained from the pulse wave information.

  In the blood pressure measurement device of the present invention, it is preferable that the output control means changes the height of the sound output from the output means in accordance with a change in a numerical value obtained from the pulse wave information.

  The blood pressure measurement device of the present invention further includes storage means for storing a numerical value obtained from the pulse wave information at the time when the average blood pressure of the living body is measured, and the output control means is stored in the storage means. It is preferable that the sound output by the output means is changed in accordance with a change in the ratio of the numerical value obtained from the pulse wave information to the stored numerical value.

  In the blood pressure measurement device according to the present invention, the output control means outputs the output until the cuff pressure exceeds the average blood pressure of the living body during the period when the cuff pressure control means increases the cuff pressure. From the pulse wave information with respect to the numerical value obtained from the pulse wave information at the time when the blood pressure of the living body becomes the average blood pressure after the cuff pressure exceeds the average blood pressure It is preferable that the sound output from the output means is changed in accordance with the change in the numerical value ratio to be obtained.

  In the blood pressure measurement device according to the present invention, the output control means obtains an extreme value of a numerical value obtained from the pulse wave information during a period when the cuff pressure control means increases the cuff pressure, Preferably, the cuff pressure corresponding to the value is determined as an average blood pressure of the living body.

  In the blood pressure measurement device of the present invention, it is preferable that the output control means changes the sound output by the output means in absolute terms with respect to a numerical value obtained from the pulse wave information.

  An audio output device according to the present invention receives pulse wave information for extracting pulse wave information from a change in volume of the artery that is generated by being attached to a predetermined part of a living body and compressed by a cuff for compressing the artery. Receiving means, an output means for outputting sound during a period when the cuff pressure, which is the internal pressure of the cuff, rises, and the sound output by the output means is a numerical value obtained from the pulse wave information received by the receiving means. It further comprises output control means for changing according to the change.

  According to the present invention, a predetermined numerical value is obtained from pulse wave information extracted based on a change in the volume of the artery of the measurer during a period when the cuff pressure increases for measuring the blood pressure of the measurer, and the Audio that changes in response to changes in numerical values is output.

  As a result, the measurer can obtain voice information that changes in accordance with the blood pressure state during the period in which the cuff pressure increases. In addition, since the provided information is a voice, information related to the blood pressure of the measurer can be provided without forcing the measurer to perform an operation such as directing his / her line of sight to the monitor. Therefore, the measurer can easily obtain any information during the period when the cuff pressure increases without requiring an operation such as turning the line of sight. Therefore, the stress of the measurer during the period when the cuff pressure increases can be easily obtained. Can be relaxed.

  Further, when the pressure that is the target for increasing the cuff pressure is determined to correspond to the blood pressure value of the measurer, the measurer obtains audio information that changes in accordance with the blood pressure state of the measurer, thereby obtaining the cuff pressure. The timing at which the pressure increase ends can be predicted without looking at the pressure display on the monitor. Thereby, the stress of the measurer who receives from the pressure display rising during pressurization can be alleviated.

  Further, when blood pressure measurement such as determination of the maximum blood pressure or determination of the minimum blood pressure is performed in the step of decreasing the cuff pressure after increasing the cuff pressure, the blood pressure of the blood pressure is determined by the audio information given during the period when the cuff pressure increases. The measurement result can be predicted. Thereby, the measurer himself / herself can evaluate the blood pressure measurement result.

  As described above, according to the blood pressure measurement device of the present invention, the stress of the measurer in the cuff pressure increasing process can be alleviated from various aspects.

  Embodiments of a blood pressure measurement device according to the present invention will be described below with reference to the drawings. In the following description, the same parts and components are denoted by the same reference numerals. Their names and functions are also the same.

[First Embodiment]
FIG. 1 is a perspective view showing a specific example of the appearance of a blood pressure measurement device (hereinafter referred to as a sphygmomanometer) 1 according to the first embodiment of the blood pressure measurement device of the present invention.

  Referring to FIG. 1, a sphygmomanometer 1 according to the present embodiment mainly includes a main body 2 placed on a desk or the like, and a measurement unit 5 for inserting an upper arm that is a measurement site. On the upper part of the main body 2, an operation unit 3 on which a power button, a measurement button, and the like are arranged, a display 4, and an elbow rest are provided. The measuring unit 5 is attached to the main body 2 at a variable angle, and includes a housing 6 which is a substantially cylindrical machine frame, and an air bag (an air bag which will be described later) housed in the inner periphery of the housing 6. 13). As shown in FIG. 1, the air bag 13 accommodated in the inner peripheral portion of the housing 6 is not exposed and is covered with the cover 7 in a normal use state. In the present embodiment, the cover 7 and the air bag 13 constitute a cuff.

  FIG. 2 is a schematic cross-sectional view of the sphygmomanometer 1 during blood pressure measurement. Referring to FIG. 2, when measuring blood pressure, the measurer inserts the upper arm A into the housing 6 and places the elbow on the elbow rest to instruct the start of measurement. The upper arm A is pressed by the air bag 13 by appropriately sending air into the air bag 13 contained in the cover 7 (not shown in FIG. 2). The cover 7 is made of, for example, cloth, and is configured to press the arm of the measurer together with the air bag 13 when the air bag 13 is inflated with air supplied thereto.

FIG. 3 is a block diagram illustrating a specific example of a functional configuration of the sphygmomanometer 1.
Referring to FIG. 3, the sphygmomanometer 1 includes the air bag 13 as described above, and is connected to the measurement air system 20. The measurement air system 20 includes a pressure sensor 23 that measures the internal pressure of the air bladder 13, a pump 21 that supplies air to the air bladder 13, and a valve 22 that exhausts air.

  The sphygmomanometer 1 includes a central processing unit (CPU) 40 that controls the overall operation of the sphygmomanometer 1, an amplifier 28 connected to the measurement air system 20, a pump drive circuit 26, and a valve drive circuit 27, An A / D (Analog to Digital) converter 29 connected to the amplifier 28, a memory unit 41 for storing a program executed by the CPU 40 and a measurement result, a display 4 for displaying the measurement result, a measurement start button and a power button And the like, a speaker 51 for outputting sound, and a microphone 52 installed in the cover 7 for detecting a Korotkoff sound of the measurer.

  The CPU 40 executes a predetermined program stored in the memory unit 41 based on the operation signal input from the operation unit 3, and outputs a control signal to the pump drive circuit 26 and the valve drive circuit 27. The pump drive circuit 26 and the valve drive circuit 27 drive the pump 21 and the valve 22 according to the control signal, and execute a blood pressure measurement operation.

  The pressure sensor 23 detects the internal pressure of the air bladder 13 and inputs a detection signal to the amplifier 28. The input pressure signal is amplified to a predetermined amplitude by the amplifier 28, converted into a digital signal by the A / D converter 29, and then input to the CPU 40.

  The CPU 40 determines the blood pressure value of the measurer based on the volume of the Korotkoff sound input from the microphone 52. Specifically, the CPU 40 increases the internal pressure of the air bladder 13 (hereinafter referred to as “cuff pressure” as appropriate) to a predetermined pressure (pressure PM as a pressurization target, which will be described later) higher than the maximum blood pressure of the measurer. Then, the internal pressure is decreased (decreased) at a constant speed by appropriately controlling the valve drive circuit 27. Then, in the step of decreasing the internal pressure of the air bladder 13, the internal pressure of the air bladder 13 when the Korotkoff sound starts to be detected is determined as the highest blood pressure of the measurer, and the lowest air bladder 13 in which the Korotkoff sound is detected. Is determined to be the minimum blood pressure of the measurer.

  In the sphygmomanometer 1, the cuff pressure is increased as a preparation step for determining the maximum blood pressure and the minimum blood pressure as described above. In this preparation step, the Korotkoff sound is detected and the volume of the Korotkoff sound is determined. For example, a sound such as an electronic sound of “beep” is output from the speaker 51 at a high volume. The details of this control will be specifically described with reference to FIG.

  FIG. 4 shows graphs of FIGS. 4 (A) to 4 (C). First, in FIG. 4A, a change in cuff pressure is shown by a solid line. In FIG. 4A, the vertical axis indicates the volume of the Korotkoff sound, and the horizontal axis indicates the passage of time. In addition, a dotted line in FIG. 4A shows a change in pulse wave detected based on a change in the pressure sensor 23 as a reference. In FIG. 4A, the cuff pressure is increased to a pressure PM, which is a pressurization target value, at a constant speed (so that the increasing pressure per unit time is constant), and then the constant speed. The state controlled to decrease at is shown. The step of increasing the cuff pressure to the pressure PM corresponds to the above-described preparation step.

  FIG. 4B shows a change in the volume of the Korotkoff sound detected via the microphone 52 corresponding to the change in the cuff pressure shown in FIG. When the cuff pressure is gradually increased, the Korotkoff sound begins to be detected when the cuff pressure becomes the pressure P1 corresponding to the diastolic blood pressure of the measurer, and the volume gradually increases and reaches a maximum value. When the cuff pressure exceeds the value P2 corresponding to the maximum blood pressure of the measurer, the cuff pressure is not detected.

  Note that FIG. 4C is information regarding the pulse wave amplitude shown for reference. Specifically, FIG. 4C shows a change in the pulse wave amplitude corresponding to the change in the cuff pressure shown in FIG. In the region where the cuff pressure is lower than the minimum blood pressure P1 of the measurer, the pulse wave amplitude gradually increases as the cuff pressure increases, and when the cuff pressure reaches the minimum blood pressure P1, the rate of increase (the amplitude per unit time increases). Ratio) greatly changes (becomes higher). After that, the pulse wave amplitude increases with increasing cuff pressure, decreases after showing a maximum value, and decreases when the cuff pressure exceeds the maximum blood pressure P2, and the pulse wave amplitude gradually decreases after that. Go.

  In the present embodiment, the pressure PM that is the target value for cuff pressure at the time of blood pressure measurement may be set uniformly, for example. It may be set based on the systolic blood pressure determined (measured) in the preliminary step. In this case, for example, the maximum blood pressure is determined based on the volume of the Korotkoff sound in the preparation step, and the pressure obtained by adding a predetermined value to the maximum blood pressure is set as the pressure PM.

  Next, the contents of the process (blood pressure measurement process) executed by the CPU 40 when the blood pressure monitor 1 measures the maximum blood pressure and the minimum blood pressure of the measurer will be described. FIG. 5 is a flowchart of blood pressure measurement processing executed by the CPU 40.

  Referring to FIG. 5, in the blood pressure measurement process, first, in step SA10, CPU 40 starts pressurization of the blood pressure measurement cuff (air bag 13), and proceeds to step SA20.

  In step SA20, CPU 40 detects the volume of the Korotkoff sound based on the signal input from microphone 52, and proceeds to step SA30.

  In step SA30, CPU 40 determines the volume of the notification sound to be output from speaker 51 based on the volume detected in step SA20, and proceeds to step SA40. In step SA30, if the Korotkoff sound is not detected in step SA20 executed immediately before (the volume is 0), the volume of the notification sound is also determined to be 0.

  In step SA30, the volume of the notification sound is determined absolutely with respect to the value of the volume of the Korotkoff sound detected in step SA20. That is, the volume of the Korotkoff sound detected in step SA20 and the volume of the notification sound determined in step SA30 have a one-to-one correspondence relationship. For example, the CPU 40 determines the volume of the notification sound as a linear function of the volume of the Korotkoff sound detected in step SA20. Of course, the absolute value of the volume may be adjustable by the measurer.

  In step SA40, CPU 40 outputs a notification sound from speaker 51 at the volume determined in step SA30, and proceeds to step SA50.

  In step SA50, the CPU 40 determines whether or not the internal pressure P of the air bladder 13 has reached the pressure PM that is the above-described pressurization target. If it is determined that the pressure has not yet reached, the process returns to step SA10. If it is determined that the process has been performed, the process proceeds to step SA60.

  In Step SA60, the CPU 40 appropriately controls the valve drive circuit 27 to perform a process of reducing the blood pressure measurement cuff (air bag 13) at a constant speed, and proceeds to Step SA70.

  Note that the process in step SA60 is continued until at least a process in step SA80 described later is executed.

  Next, in step SA70, CPU 40 determines the measurer's systolic blood pressure, and proceeds to step SA80.

In step SA80, the CPU 40 determines the minimum blood pressure of the measurer.
When the determination of the minimum blood pressure is completed, the CPU 40 ends the blood pressure measurement process. It should be noted that a known technique can be adopted for determination of the systolic blood pressure in step SA70 and determination of the diastolic blood pressure in step SA80, and therefore detailed description will not be repeated here.

  In the blood pressure measurement process described above with reference to FIG. 5, after the internal pressure (cuff pressure) of the air bladder 13 has been increased to the pressure PM, Maximum blood pressure and minimum blood pressure are determined. Then, during the period when the cuff pressure is increased to the pressure PM, the notification sound is output from the speaker 51 at a volume corresponding to the volume of the Korotkoff sound.

  As described with reference to FIG. 4B, the volume of the Korotkoff sound first increases during the period in which the cuff pressure changes from the lowest blood pressure of the measurer to the highest blood pressure, and then decreases after showing the maximum value. To do. Further, as described above, the volume of the notification sound output in step SA40 is determined absolutely (in a one-to-one correspondence) with respect to the volume of the Korotkoff sound. Therefore, according to the blood pressure measurement process of the present embodiment, the measurer can recognize the change in the volume of the Korotkoff sound of the measurer based on the volume of the notification sound in the preliminary pressurizing step. . Thus, the measurer can know that pressurization is almost over based on the cuff pressure exceeding the minimum blood pressure value or the cuff pressure exceeding the maximum blood pressure.

  In the present embodiment described above, the volume of the notification sound to be output is determined according to the volume of the Korotkoff sound in the process of increasing the cuff pressure. Here, what changes according to the volume of the Korotkoff sound may be the pitch (number of pitches) of the notification sound. Further, the rhythm of the notification sound to be output (for example, the time interval at which the continuously output notification sound is output) may be set according to the change in the volume of the Korotkoff sound. Further, a range for the volume of the Korotkoff sound may be set, and a different piece of music may be output for each range.

[Second Embodiment]
In the first embodiment described above, the sphygmomanometer 1 outputs the notification sound that changes in response to the change in the magnitude of the Korotkoff sound detected by the microphone 52. As a result, the measurer reduces the volume of the notification sound and the notification sound when the cuff pressure approaches the maximum blood pressure of the measurer and exceeds the maximum blood pressure during the period when the degree of compression by the cuff increases. Each can be recognized by stopping the output. As described with reference to FIGS. 4A and 4B, the volume of the Korotkoff sound of the measurer decreases as the cuff pressure increases in the vicinity of the pressure P2, which is the maximum blood pressure, This corresponds to the disappearance of the Korotkoff sound when the pressure P2 is exceeded.

  On the other hand, as described with reference to FIG. 4C, the pulse wave amplitude of the measurer also changes in the same manner. That is, as apparent from the ridge line of the pulse wave amplitude indicated by the dotted line in FIG. 4C, when the cuff pressure increases in the sphygmomanometer 1, the cuff pressure reaches the pressure P1 that is the minimum blood pressure of the measurer. Until then, the pulse wave amplitude rises slowly, and when the cuff pressure exceeds the diastolic pressure P1, the pulse wave amplitude increases to a greater extent, decreases after a maximum, and decreases relatively quickly, and After exceeding the maximum blood pressure P2, the degree of decrease becomes moderate.

  In FIG. 6, the volume of the notification sound is determined according to the volume of the Korotkoff sound in the blood pressure measurement process described with reference to FIG. 5, but the volume of the notification sound is determined according to the pulse wave amplitude. The flowchart of the modified example shown is shown.

  Referring to FIG. 6, in this modification, in step SB10, CPU 40 starts pressurizing air bag 13 (blood pressure measurement cuff) in the same manner as in step SA10 (see FIG. 5).

  In step SB20, the pulse wave amplitude is calculated based on the pulse wave detected by the pressure sensor 23 (indicated by the dotted line in FIG. 4A), and in step SB30, the pulse wave amplitude is calculated in the immediately preceding step SB20. The volume of the notification sound output from the speaker 51 is determined based on the value of the pulse wave amplitude.

  Then, in step SB40, the CPU 40 outputs the notification sound of the volume determined in step SB30 from the speaker 51, and determines in step SB50 whether or not the cuff pressure P has reached the pressure PM that is the pressurization target. .

  If it is determined that it has not been reached, the process returns to step SB10. That is, until the cuff pressure reaches the pressure PM, the cuff pressure is increased at a constant speed, and a notification sound having a volume corresponding to the value of the pulse wave amplitude is output from the speaker 51.

  On the other hand, after the cuff pressure P reaches the pressure PM, the decompression of the air bag 13 is started in step SB60, the maximum blood pressure is determined in step SB70, and the minimum blood pressure is determined in step SB80, as in steps SA60 to SA80. Once determined, the blood pressure measurement process ends.

[Third Embodiment]
As in the first and second embodiments described above, in the step of increasing the cuff pressure, the notification sound has a volume that absolutely corresponds to the volume of the Korotkoff sound and the value of the pulse wave amplitude of the measurer. Can be controlled easily, while measuring person with small degree of change of Korotkoff sound and pulse wave amplitude, and absolute value of Korotkoff sound volume and pulse wave amplitude are generally small For the measurer, depending on the change in the volume of the notification sound, it may be difficult to recognize that the pressurization process is nearing the end because the cuff pressure approaches the maximum blood pressure or exceeds the maximum blood pressure.

This will be described more specifically with reference to FIGS. 7A to 7C.
FIG. 7A shows a state in which the cuff pressure changes as time passes. Specifically, a state is shown in which the cuff pressure increases from a value lower than the pressure P1 that is the minimum blood pressure of a certain measurer to the pressure PM that is the pressurization target, and then the cuff pressure decreases.

  FIGS. 7B and 7C show the pulse wave amplitude corresponding to the change in the cuff pressure shown in FIG. 7A of the measurer whose minimum blood pressure is pressure P1 and maximum blood pressure is pressure P2. Each change is shown.

  In addition, the value of the pulse wave amplitude is generally larger in the graph shown in FIG. 7C than in the graph shown in FIG. That is, while the maximum pulse wave amplitude in FIG. 7C is the amplitude W1, in the graph shown in FIG. 7B, the pulse wave amplitude corresponding to the same cuff pressure is The maximum value of the pulse wave amplitude at 1 does not reach the amplitude W1 shown in FIG.

  Although the aspect of the change of the pulse wave amplitude shown in FIG. 7B and the aspect of the change of the pulse wave amplitude shown in FIG. 7C are similar, overall, FIG. ) Shows a smaller pulse wave amplitude overall. For this reason, when the notification sound is controlled according to the process described with reference to FIG. 6, it is considered that the change in the output volume is smaller than that in the case illustrated in FIG. Therefore, in such a case, it is difficult for the measurer to recognize the change in the volume. From this, according to the change in the pulse wave amplitude, the pressurization process approaches the end by decreasing the volume once and then decreasing. It is considered difficult to recognize.

  In order to cope with such a situation, the volume of the notification sound is the pulse wave amplitude as described in the second embodiment, or the volume of the Korotkoff sound as described in the first embodiment. It may be determined corresponding to the ratio to the maximum value.

  That is, for example, when the cuff pressure is increased, the sphygmomanometer according to the present embodiment outputs the notification sound at a constant volume until the volume of the Korotkoff sound or the pulse wave amplitude exhibits a maximum value. After the maximum value of the Korotkoff sound volume or pulse wave amplitude is detected, the respective measured values for the maximum value of the Korotkoff sound volume or the maximum value of the pulse wave amplitude until the cuff pressure pressurization process is completed. The sound volume of the notification sound is determined in accordance with the ratio, and the notification sound is output at the determined sound volume.

  Further, in the sphygmomanometer of the present embodiment, the notification sound output mode after the pulse wave amplitude has reached the maximum value (maximum value) is the time when the pulse wave amplitude has reached the maximum value (maximum value). It may be determined by correcting the correspondence between the value of the wave amplitude and the volume of the notification sound.

  Specifically, when the maximum value of the pulse wave amplitude is detected, the minimum volume and maximum volume of the notification sound are allocated between the pulse wave amplitude at the start of pressurization to the cuff and the maximum amplitude. As described above, the relationship between the measured value of the pulse wave amplitude and the volume of the notification sound to be output is normalized. After detecting the maximum value, the volume of the notification sound with respect to the measured value of the pulse wave amplitude is determined based on the relationship after normalization as described above.

  By correcting the correspondence between the value of the pulse wave amplitude and the volume of the notification sound by such normalization, for example, the pulse wave amplitude is changed from W3 to the detection result as shown in FIG. The pulse wave amplitude changes from W1 to W2 with respect to the change amount of the volume of the notification sound that changes according to the value of the pulse wave amplitude when changing to W4 and the detection result as shown in FIG. In this case, the amount of change in the volume of the notification sound that changes according to the value of the pulse wave amplitude is the same amount. More specifically, after the pulse wave amplitude takes the maximum value, in the example of FIG. 7C, the volume of the notification sound changes from 40 dB to 30 dB even when the pulse wave amplitude changes from W1 to W2. On the other hand, in the example of FIG. 7B, even if the change of the pulse wave amplitude is a change from W3 to W4 smaller than W1 to W2, the change in the volume of the notification sound is from 40 dB to 30 dB, that is, It changes by the same amount as in the example of FIG.

[Fourth Embodiment]
The blood pressure measurement device according to the present embodiment can have the same configuration as the blood pressure monitor 1 according to the first embodiment described above. The sphygmomanometer 1 according to the present embodiment differs from the first embodiment described above in the processing content in the blood pressure measurement process. Therefore, the content of the blood pressure measurement process executed in the present embodiment will be described below.

FIG. 8 is a flowchart of blood pressure measurement processing executed by the CPU 40 of the present embodiment.
Referring to FIG. 8, in the blood pressure measurement process, first, in step SA1, CPU 40 stands by in order to accept the input of the user ID from the measurer.

  When a user ID is input to the operation unit 3, the maximum volume stored in the memory unit 41 corresponding to the user ID is read in step SA2.

  Table 1 shows an example of user information stored in the memory unit 41 of the sphygmomanometer 1 of the present embodiment.

  In the memory unit 41 of the present embodiment, as shown in Table 1, a user ID for identifying each measurer and a numerical value corresponding to the maximum value of the volume of the Korotkoff sound at the time of the last blood pressure measurement of each measurer. A certain maximum volume is associated with each other.

  In step SA2, CPU 40 reads the maximum volume stored in association with the user ID input to operation unit 3 in the user information.

  In step SA10, the CPU 40 starts pressurization of the air bladder 13 as in step SA10 in the blood pressure measurement process described with reference to FIG. 5, and advances the process to step SA20.

  In step SA20, the CPU 40 detects a Korotkoff sound based on the sound input from the microphone 52, and advances the process to step SA31.

  In step SA31, the CPU 40 determines the volume of the notification sound based on the volume of the Korotkoff sound detected in step SA20 executed immediately before the maximum volume read in step SA2, and advances the process to step SA40.

  In step SA40, a notification sound is output from the speaker 51 at the volume determined in step SA31 executed immediately before, and the process proceeds to step SA50.

  In step SA50, the CPU 40 determines whether or not the cuff pressure P has reached the pressure PM. If it is determined that the cuff pressure P has not reached, the process returns to step SA10. On the other hand, when determining that it has reached, the CPU 40 advances the process to step SA60.

  Since the processing contents of steps SA60 to SA80 are the same as those described with reference to FIG. 5, description thereof will not be repeated here.

  In the present embodiment described above, for each measurer, a maximum volume that is considered to be the volume of the Korotkoff sound corresponding to the past average blood pressure of the measurer is stored in advance. And in the pressurization process of the air bag 13, when the volume of the Korotkoff sound is changed as described with reference to FIG. 4B, the volume of the measured Korotkoff sound is different for each measurer. A ratio with respect to (see Table 1) is calculated, and a notification sound having a volume determined according to the ratio is output from the speaker 51.

[Fifth Embodiment]
The blood pressure measurement device according to the present embodiment uses the volume of the notification sound output from the speaker 51 in the cuff pressure increasing process described in the first embodiment with reference to FIG. In the case of changing according to the amplitude, a case where the volume of the notification sound is changed using the user information as described with reference to FIG. 8 will be described. The sphygmomanometer 1 according to the present embodiment differs from the first embodiment described above in the processing content in the blood pressure measurement process. Therefore, the content of the blood pressure measurement process executed in the present embodiment will be described below.

  In the sphygmomanometer 1 of the present embodiment, the memory unit 41 stores information as shown in Table 2 as user information.

  In the user information shown in Table 2, while the maximum volume of the Korotkoff sound of each measurer is stored in association with the user ID in Table 1, the pulse wave amplitude of each measurer at the time of the previous measurement is stored. The maximum value (maximum pulse wave amplitude) is stored in association with the user ID.

  FIG. 9 shows a flowchart of the blood pressure measurement process when the volume of the notification sound is controlled in the cuff pressure increasing process.

  With reference to FIG. 9, in the blood pressure measurement process, first, in step SB <b> 1, similarly to step SA <b> 1 described with reference to FIG. 8, CPU 40 waits until a user ID is input to operation unit 3.

  Then, when the user ID is input, the CPU 40 determines the maximum pulse wave amplitude stored in association with the user ID received in step SB1 from the user information as shown in Table 2 in step SB2. And proceeds to step SB10.

  In step SB10, similarly to step SB10 described with reference to FIG. 6, a process for increasing the internal pressure of the air bladder 13 at a constant speed is started, and the process proceeds to step SB20.

  In step SB20, CPU 40 calculates the pulse wave amplitude and proceeds to step SB31.

  In step SB31, the ratio of the pulse wave amplitude calculated in the immediately preceding step SB20 to the maximum pulse wave amplitude read in step SB2 is calculated, and the volume of the notification sound to be output from the speaker 51 is determined based on the ratio. The process proceeds to step SB40.

  In step SB40, CPU 40 outputs a notification sound from speaker 51 at the volume determined in immediately preceding step SB31, and proceeds to step SB50.

  In step SB50, the CPU 40 determines whether or not the internal pressure (cuff pressure P) of the air bladder 13 has reached the pressure PM that is the target of increase, and if not, returns the process to step SB10 and reaches it. If it is determined that the process has been performed, the process proceeds to step SB60.

  For step SB60 to step SB80, the CPU 40 executes the same process as the process in each step described with reference to FIG.

  After executing the process of step SB80, in step SB90, the CPU 40 calculates the maximum pulse wave amplitude for the user ID received in step SB1 of the user information shown in Table 2 as the blood pressure executed this time. The blood pressure measurement process is terminated by updating the maximum value of the pulse wave amplitude in the measurement process.

[Other variations]
Each of the embodiments described above exemplifies a blood pressure measurement device that measures (determines) the maximum blood pressure and the minimum blood pressure in the step of decreasing the cuff pressure after increasing the cuff pressure to a pressure higher than the maximum blood pressure. It was. In the blood pressure measurement device, in the step of increasing the cuff pressure, a sound that changes in accordance with changes in numerical values (for example, the volume of the Korotkoff sound, the pulse wave amplitude, etc.) obtained from the pulse wave information of the measurer. , Was output from the speaker. It should be noted that the present invention is not limited to a blood pressure measuring device of a type in which blood pressure is measured in the cuff pressure reducing process. That is, for example, even in a blood pressure measurement device that measures the maximum blood pressure and the minimum blood pressure in the step of increasing the cuff pressure, the numerical value obtained from the pulse wave information of the measurer in the step of increasing the cuff pressure The present invention can be applied by outputting a sound that changes in accordance with a change.

  In addition, the present invention provides pulse wave information such as Korotkoff sounds and pulse waves, which are extracted based on a change in the volume of an artery caused by being compressed by a cuff for a device having a function capable of outputting a notification sound, or these It is conceivable that the same effect can be obtained by inputting a value such as a volume value or pulse wave amplitude of Korotkoff sound obtained from the above and controlling the sound volume corresponding to this value to be output. That is, the present invention is a case where the sphygmomanometer itself in each of the embodiments described above is not provided with a function of outputting a sound, and the sphygmomanometer is provided for each device that can output other sound. It is intended that the technical scope also includes outputting the information for outputting the notification sound while changing the volume or the like in a manner similar to the manner that the blood pressure monitor has outputted in the form. When configured in this manner, the sphygmomanometer of each embodiment functions as a sound output device. Needless to say, the sphygmomanometer may have a function of outputting sound, or may be configured to transmit information for outputting sound to other devices.

  Further, in each of the embodiments described above, a sphygmomanometer that measures blood pressure by wearing a cuff including an air bag on the upper arm of the measurer is exemplified, but the blood pressure measurement device to which the present invention is applied is this It is not limited to such a type. For example, applied to other types of blood pressure measurement devices, such as a type that detects a pulse wave via the radial artery by attaching a cuff to the wrist and measures the blood pressure based on the detected pulse wave signal May be.

  Each embodiment disclosed this time must be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. In addition, it is intended that the techniques exemplified in the embodiments of the present specification are combined and realized as much as possible.

It is a perspective view which shows the specific example of the external appearance of the blood pressure meter which concerns on 1st Embodiment of the apparatus for blood pressure measurement of this invention. It is a cross-sectional schematic diagram at the time of blood pressure measurement of the sphygmomanometer of FIG. It is a block diagram which shows the specific example of a function structure of the blood pressure meter of FIG. It is a figure for demonstrating the change of the volume of a Korotkoff sound with respect to the change of a cuff pressure, and the pulse wave amplitude at the time of blood-pressure measurement of the sphygmomanometer of FIG. It is a flowchart of the blood-pressure measurement process which CPU of FIG. 3 performs. It is a flowchart of the blood-pressure measurement process performed in the blood pressure meter which concerns on 2nd Embodiment of the apparatus for blood pressure measurement of this invention. The figure which shows the change pattern of two pulse wave amplitudes from which the variation | change_quantity accompanying the change of a cuff pressure differs entirely in order to demonstrate operation | movement of the blood pressure meter which concerns on 3rd Embodiment of the apparatus for blood pressure measurement of this invention. It is. It is a flowchart of the blood-pressure measurement process performed in the blood pressure meter which is 4th Embodiment of the apparatus for blood-pressure measurement of this invention. It is a flowchart of the blood-pressure measurement process performed in the blood pressure meter which is 5th Embodiment of the apparatus for blood-pressure measurement of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Blood pressure monitor, 2 Main body, 3 Operation part, 4 Display part, 5 Measurement part, 6 Housing, 7 Cover, 13 Air bag, 20 Air system for measurement, 21 Pump, 22 Valve, 23 Pressure sensor, 26 Pump drive circuit, 27 Valve drive circuit, 28 amplifier, 29 A / D, 40 CPU, 41 memory unit, 51 speaker, 52 microphone.

Claims (10)

A cuff pressure for controlling a cuff pressure, which is a fluid bag included in a cuff to be attached to a predetermined part of a living body and compresses an artery, and which is inflated when a fluid is supplied. Control means;
Pulse wave information extracting means for extracting pulse wave information from a volume change of the artery caused by being compressed by the cuff;
Output means for outputting sound during a period when the cuff pressure control means increases the cuff pressure;
An apparatus for blood pressure measurement, further comprising: output control means for changing the sound output from the output means in accordance with a change in a numerical value obtained from the pulse wave information extracted by the pulse wave information extraction means. The pulse wave information extracted by the pulse wave information extraction means is a Korotkoff sound,
The blood pressure measurement device according to claim 1, wherein the output control unit controls the volume of the sound output from the output unit in accordance with a change in the volume of the Korotkoff sound, which is a numerical value obtained from the pulse wave information.   The blood pressure measurement device according to claim 1, wherein the output control unit calculates a pulse wave amplitude from the pulse wave information, and controls a sound volume output from the output unit according to a change in the pulse wave amplitude. .   The blood pressure measurement device according to any one of claims 1 to 3, wherein the output control means changes a sound volume output from the output means in accordance with a change in a numerical value obtained from the pulse wave information. .   The blood pressure measurement device according to any one of claims 1 to 4, wherein the output control means changes the height of the sound output from the output means in accordance with a change in a numerical value obtained from the pulse wave information. apparatus. Storage means for storing a numerical value obtained from the pulse wave information at the time when the average blood pressure of the living body is measured;
The output control means changes sound output by the output means in accordance with a change in a ratio of a numerical value obtained from the pulse wave information to a numerical value stored in the storage means. The blood pressure measurement device according to any one of the above.   The output control means causes the output means to output sound in a certain manner until the cuff pressure exceeds the average blood pressure of the living body during the period in which the cuff pressure control means increases the cuff pressure, After the cuff pressure exceeds the average blood pressure, according to the change in the ratio of the numerical value obtained from the pulse wave information to the numerical value obtained from the pulse wave information at the time when the blood pressure of the living body becomes the average blood pressure, The blood pressure measurement device according to any one of claims 1 to 5, wherein the sound output by the output means is changed.   The output control means obtains an extreme value of a numerical value obtained from the pulse wave information during a period when the cuff pressure control means increases the cuff pressure, and obtains the cuff pressure corresponding to the extreme value of the living body. The blood pressure measurement device according to claim 7, wherein the blood pressure measurement device determines that the blood pressure is an average blood pressure.   The blood pressure measurement device according to any one of claims 1 to 5, wherein the output control means changes the sound output by the output means in absolute terms with respect to a numerical value obtained from the pulse wave information. Receiving means for receiving pulse wave information for extracting pulse wave information from a volume change of the artery generated by being compressed by a cuff for being attached to a predetermined part of a living body and compressing an artery;
Output means for outputting sound during a period when the cuff pressure, which is the internal pressure of the cuff, rises;
An audio output device further comprising: output control means for changing the sound output from the output means in accordance with a change in a numerical value obtained from the pulse wave information received by the receiving means.

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