JPS63230148A - Hemomanometer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a blood pressure monitor that measures blood pressure using a non-invasive measurement method such as an oscillometric method.

[Prior art]

The importance of blood pressure control as an item of health management has been recognized, and blood pressure monitors that can be measured by individuals without relying on a doctor are becoming more widespread. To measure blood pressure, the residual blood measurement method, in which a catheter is inserted into a blood vessel and the pressure is directly measured, is the method that yields the closest value to the true blood pressure, but catheter insertion can only be done safely by an experienced person. This is a method that can be carried out in many cases, and is not suitable as a method for individuals to easily measure blood pressure. Therefore, blood pressure needles that use a simple, non-invasive measurement method that indirectly measures blood pressure using events closely related to blood pressure have become popular.

As a non-invasive measurement method, a cuff is wrapped around the upper arm of the person to be measured, air is blown through the cuff to compress the upper arm, and once the pressure has risen to a predetermined level, the pressure is reduced and the peripheral artery is measured using a stethoscope. The Riva-
Rocci method, ultrasonic Doppler method in which an ultrasound transmitter/receiver is installed in the artery under the cuff and detects the movement of the artery wall as a Doppler signal due to the sudden opening of the artery, and the correlation between the internal cuff pressure and the amplitude of arterial vibration. There are oscillometric methods that measure blood pressure based on relationships.

Incidentally, blood pressure fluctuates even within a day, and the measured value differs between when the person is at rest and during exercise and BJ loading.

Therefore, blood pressure values measured only once at any given time under special conditions such as when at rest cannot accurately grasp the state of health, and in sick patients, blood pressure values measured only once at any given time cannot be used. It can be said that the reliability of drug efficacy evaluation is low. Therefore, there is an increasing need to understand the oral rhythm of blood pressure and to measure it during exercise stress, and a blood pressure monitor that can measure blood pressure unrestrictedly for a long time has been devised. Data recording methods for such blood pressure monitors include a telemeter method in which measured data is collected and recorded via an antenna, etc., and a method in which data is directly recorded on a portable data recording device. ”3
9, No. 7, 1981).

[Problem that the invention seeks to solve]

By the way, with the conventional telemetry method, measurements can only be made within the range where the antenna for collecting data is installed, which limits the movement range of the person being measured. Since the device only records data and does not have a display means, it cannot monitor the measured data moment by moment, and requires a special playback device to play back the recorded data.

The present invention has been made to solve these problems, and an object of the present invention is to provide a blood pressure monitor equipped with a portable data recording device capable of displaying measured data.

[Means for solving problems]

The present invention provides a portable blood pressure monitor that measures blood pressure using a non-invasive measurement method and stores the measured value in a memory, which includes a display that displays the value stored in the memory and an audio output of the measured value. The device is characterized by comprising an audio output section that performs the following operations.

[Effect]

The device of the present invention measures blood pressure using a non-invasive measurement method, stores the measured value in a memory, outputs audio, and displays the stored value on a display.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on drawings showing embodiments thereof. Among the non-invasive measurement methods described above, the oscillometric method, which is resistant to noise such as body movement, is employed in the device of the present invention.

The advantages of the oscillometric method are that it is resistant to noise, as well as: (1) It can be measured even in conditions where Korotkoff sounds are difficult to hear, such as during hypotension or shock; (2) In principle, blood pressure and pulse waves can be measured at the measurement site. If present, it can be measured at wrists, ankles, etc. (31 Arteriosclerosis, where extra pressure is applied due to occlusion of a sclerotic artery, resulting in a blood pressure higher than the true blood pressure, as when using the Riva-Rocci method) Examples include avoiding or obtaining the effects of diseases, etc.

First, the principle of measurement using the oscillometric link method will be explained.

When measuring blood pressure using a non-invasive method, regular oscillations (oscillations) occur along with the arterial pulse as the cuff pressure decreases from the point where it exceeds the systolic pressure of the heart to the point where it falls below the diastolic pressure. ) phenomenon occurs in the cuff internal pressure.

The internal pressure of the cuff is gradually reduced (at first, the amplitude of the oscillation is very small, then the amplitude gradually increases, and at a certain point the amplitude suddenly increases, then gradually increases the amplitude, and then reaches the maximum). , the amplitude gradually decreases, and at a certain point the amplitude suddenly decreases, and then gradually disappears.
The figure is a graph showing the relationship between such an oscillation phenomenon and the cuff internal pressure. In the oscillometric method, blood pressure is measured based on the correlation between the two. In other words, the point at which the vibration amplitude rapidly increases corresponds to the systolic pressure, the so-called systolic pressure; the point at which it rapidly decreases corresponds to the diastolic pressure, the so-called diastolic pressure; and the point at which the vibration amplitude shows the maximum amplitude corresponds to the mean blood pressure. J
Vol. 53 No. 11.1983).

Next, the configuration of the device of the present invention will be explained based on a schematic external view of the blood pressure monitor main body shown in FIG. 2 and a circuit block diagram shown in FIG. 3. In Figure 2, the operation surface of the blood pressure monitor body, which is formed into a thin box shape, displays numerical settings and various commands [data display].
MD) ・Data printing (PO) ・Time setting (SET
) ・Start measurement (ST) ・Memory clear (4C)
・Matrix key 1 is provided with keys for setting (reset (RT)) arranged in a matrix, and a liquid crystal display that displays the required data in characters or graphs according to the data display and time setting commands given from these keys. A dot matrix display (hereinafter simply referred to as a display) 2 is provided.

Furthermore, a speaker 3 for audio output, a switch 4 for switching the audio output of the speaker 3 from 0N10FF, an automatic/manual selection switch 5 for blood pressure measurement, an initial pressure setting switch 6 for cuff pressurization,
A measurement start/stop switch 7, a power switch 8, etc. are provided. Further, the blood pressure monitor body is provided with an output terminal 9 to a printer, making it possible to print data on a printer. The sphygmomanometer itself is carried in an abdominal belt or the like, as shown in FIG. 5, which shows an example of how it is worn.

In FIG. 3, IO indicates a cuff wrapped around the upper arm of the subject, and vibrations generated in the internal pressure of the cuff 10 are detected by a vibration sensor 11 attached thereto.

The vibration detected by the vibration sensor 11 is divided into normal vibration (vibration associated with arterial pulsation) and abnormal vibration (vibration due to body movement or noise) by a filter 12, and the maximum amplitude of the normal vibration is held at its peak. It is held in the circuit 13. This hold value is digitally processed by the A/D transducer 14, and the maximum amplitude of vibration is output to the C-MOS type CPU 15.

Further, the signal indicating the cuff internal pressure at this time is converted into a voltage by a transducer 18 connected to the cuff 10 and a pressure pump 17 that pressurizes/depressurizes the cuff internal pressure, and is frequency converted by a V/F converter 19, and is converted into a voltage by a V/F converter 19. The cuff internal pressure is output to the CPU 15 in synchronization with the time when the vibration reaches its maximum amplitude.

Further, within the CPU 15, a timer 20 is provided which performs a timing operation according to timer settings. The CPU 15 also includes a time base 21 which is the source oscillation of the timer 20, the matrix key 1, the display 2, an audio output section 22 that outputs the measured blood pressure as an audio signal, a compressor motor 23 for automatic pressurization/depressurization, and the pressure pump. 17 are connected. Further, a printer 24 is connected to the RAM 16 to record the measured blood pressure in writing.

Next, the data stored in the RAM 16 will be explained. RAM
16 stores data for up to 50 measurements, with one measurement data consisting of systolic blood pressure, diastolic blood pressure, pulse rate, measurement date and time (9th day of the month at 1:00 a.m.), and is numbered and stored in the order of measurement. A maximum of 10 pulse wave trends (time-axis values), which are formed by gathering up to 80 points of data with each vibration peak value of the pulse wave and the corresponding pressure value as one point, are stored and displayed based on these data. 2, numerical data is displayed and graphs based on the data are displayed.

A bank-up power supply is also used for the power supply so that the data in the RAII 116 is retained even if the main power is turned off.

The device of the present invention configured as described above has a timer function,
Blood pressure measurements can be taken over a period of time. It also has a clock function for measuring data.

The data at 3:05:3 on the day is read out and stored in the RAM 16 along with the measurement data. Note that the time can be corrected by operating the time setting instruction key and the numerical keys of the matrix key 1. Further, the measured blood pressure value is outputted in the form of audio every time it is measured.

Furthermore, the display 2 displays the year, month, day, hour, minute, and second as display functions, and the data number and second as the current measurement data.
It displays systolic blood pressure, diastolic blood pressure, pulse rate, measurement time, timer setting time and timer switch 0N10FF, and also displays measurement data of any number according to data display instructions.

In addition, in the device of the present invention, a power-saving type C-
Using MOS IC, CPU and RAM are C-MO
It is miniaturized by using a battery as an S-type power source, and is also equipped with a data display function, which displays data stored in the memory as numerical values as well as graphs such as oral blood pressure rhythm created based on the data. Note that if the display function is limited to either numerical data display or graph display, the blood pressure monitor can be made more compact.

The blood pressure monitor of the present invention has such a configuration, and blood pressure measurement and display thereof are performed as follows. FIG. 4 is a flowchart showing the operating procedure of the blood pressure monitor of the present invention, and this flowchart shows the operation of calculating the systolic blood pressure, diastolic blood pressure, and pulse rate several times continuously every 5 minutes.

In this embodiment, the principle for calculating the systolic blood pressure and diastolic blood pressure is as shown below. In the oscillation phenomenon, the maximum amplitude of vibration gradually increases, reaches its peak, and then gradually decreases, and the internal cuff pressure at the time when the maximum amplitude of vibration rapidly increases (decreases) is the systolic blood pressure (diastolic blood pressure). ). Therefore, the lower limit of the maximum amplitude of vibration (the lower limit of the maximum amplitude of vibration from the time when the systolic blood pressure is indicated to the time when the diastolic blood pressure is indicated) is set in advance, and each vibration is sequentially increased while gradually decreasing the internal cuff pressure. detecting the maximum amplitude, setting the cuff internal pressure at the time when a vibration whose maximum amplitude first falls below the lower limit value occurs as the systolic blood pressure, and then gradually decreasing the cuff internal pressure and sequentially detecting the maximum amplitude of each vibration; The cuff internal pressure at the time when a vibration whose maximum amplitude is below the lower limit value first occurs is defined as the diastolic blood pressure.

A detailed explanation will be given below based on the flowchart shown in FIG. This flowchart consists of (1) a main routine, which is a preparation stage for measuring blood pressure, and (2) a measurement routine, which actually measures blood pressure.

First, a cuff is wrapped around the subject, and the internal pressure of the cuff is set to the specified value (
20+u1g) or less (2), and if it is greater than the specified value, reduce the pressure to below the specified value.

Set the measurement time to 5 minutes and turn on the timer 20■,
■ Increase the cuff internal pressure by 2011Hg. At this time, if the cuff is fully inflated, an error is determined. Cuff internal pressure 2
(Set value for each increase in bmHg (3 (h) from systolic pressure)
Check whether the pressure is higher than the set value (mHg high pressure value). If the set value has not been reached, repeat the pressurization of 20 dragons of Hg. When the cuff internal pressure exceeds the set value, check whether vibration is detected in the cuff internal pressure. If it is detected, the cuff internal pressure is too low, so 2 OnH
Increase the internal pressure of the cuff.

On the other hand, if no vibration is detected, the measurement routine is entered■.

The air inside the cuff is exhausted so that the internal pressure of the cuff is reduced at a rate of 3 mm and 11 g per second. The CPU 15 reads a digital signal of the cuff internal pressure in synchronization with the time when each vibration shows the maximum amplitude, the RAM 16 stores the digital value, and the display 2 displays the digital value. At this time, the speaker 3 simultaneously outputs a sound indicating the digital value display. It is checked whether the maximum amplitude of the vibration is larger than the lower limit value, and if it is not, the above-described operation is repeated until a vibration having a maximum amplitude larger than the lower limit value appears.

If the maximum amplitude is larger than the lower limit, the deviation between the cuff internal pressure at this time and the cuff internal pressure at the time of detection start is 2 (ln
Check to see if it is Hg or higher ■. If it is 20+n11g or more, stop the decompression and check whether the maximum amplitude of the next vibration is larger than the lower limit. [Phase] is displayed, and the value is outputted audibly from the speaker 3. On the other hand, if the deviation is less than 20+mHg, return to the main routine, apply 29mmHg to the cuff internal pressure again, and check whether vibration is detected. Also, if the maximum amplitude of the next vibration is not larger than the lower limit, it is determined as an error.

After displaying the systolic blood pressure, the cuff internal pressure is reduced at a rate of 3 Hg per second in the same way as in the operation described above, and a digital pressure signal is input to the CPU 15 in synchronization with the time when each vibration shows the maximum amplitude. , is stored in the RAM 16, and its digital value is displayed on the display 2. At this time, the speaker 3 simultaneously outputs a sound indicating the digital value display.

It is checked whether the maximum amplitude of the vibration is greater than or equal to the lower limit value, and if it is greater than or equal to the lower limit value, the above-mentioned operation is repeated until a vibration having a maximum amplitude less than the lower limit value appears. During this time, the time difference between adjacent vibrations showing maximum amplitude is measured, and based on the data for two times of the time difference, the pulse rate is stored in the RAM 16 and the value is displayed on the display 2. If the maximum amplitude is less than the lower limit, stop decompression, check whether the maximum amplitude of the next vibration is greater than or equal to the lower limit, and if it is less than the lower limit, reduce the cuff internal pressure to the minimum The blood pressure is displayed on the display 2 and the value is outputted as voice from the speaker 3. Furthermore, if the maximum amplitude of the next vibration is greater than or equal to the lower limit value, an error is determined. Once the diastolic blood pressure is displayed, the system proceeds to an evacuation routine where air is evacuated from the cuff.

Thereafter, the P timer is set, and the process returns to the main routine, where the second blood pressure measurement is performed again in the same manner. Note that such measurements are repeated until the timer detects that 5 minutes have passed.

In this calculation method, blood pressure is calculated based on the maximum amplitude of two consecutive vibrations, so even if abnormal vibrations are mixed into normal vibrations, blood pressure can be accurately measured.

Blood pressure measurements are performed several times within 5 minutes, and data on systolic blood pressure and diastolic blood pressure are obtained for each number of measurements. Next, the average systolic blood pressure value and diastolic blood pressure value for these 5 minutes are calculated using these multiple pieces of data. This blood pressure measurement in units of 5 minutes is carried out several times at appropriate time intervals during -day, and in each case, an average systolic blood pressure value and diastolic blood pressure value are obtained. Then, based on these obtained blood pressure values, a graph showing the circadian rhythm of systolic blood pressure and diastolic blood pressure is created and displayed on display 2 in response to a data display command given from matrix key 1.

〔effect〕

The device of the present invention incorporates power-saving C-MOS IC and C-MOS CPIJ in the main body of the blood pressure monitor that performs long-term unrestricted measurements.
By making it possible to operate using a battery power source, it is possible to realize a portable type and downsize the device.

In addition, the data can be visualized in a graph to facilitate understanding of the oral blood pressure rhythm, promote daily blood pressure measurement, and popularize more accurate symptom diagnosis and drug efficacy evaluation based on the diurnal blood pressure rhythm.

Furthermore, by outputting the measured data audibly, an equivalent effect can be achieved in which even a blind person can measure blood pressure.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the principle of the oscillometric method used in the present invention, Fig. 2 is a schematic external view of the main body of the inventive device, Fig. 3 is its circuit block diagram, and Fig. 4 is a flowchart showing the measurement procedure. , FIG. 5 is a view showing an example of mounting. ■...Matrix key 2...Display 1
5...CPU 16...RAM Patent applicant Sanyo Electric Co., Ltd. agent Patent attorney Noboru Kono 1 Illustration 2 Call for illustrations 4 Alliance Diagram D

Claims (1)

[Claims] 1. A portable blood pressure monitor that measures blood pressure using a non-invasive measurement method and stores the measured value in a memory, comprising: a display that displays the value stored in the memory and the measured value; A sphygmomanometer characterized by comprising: an audio output section that outputs audio. 2. The blood pressure monitor according to claim 1, wherein the display graphically displays the values stored in the memory.