JPS62170226A - Blood pressure measuring apparatus - 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] (a) Industrial application field This invention has both an electronic blood pressure measurement function that automatically measures blood pressure values and a blood pressure measurement function using an auscultation method, and can be used selectively. The present invention relates to a blood pressure measuring device.

(B) Prior Art Conventionally, in order to measure blood pressure, a blood pressure determining means is usually provided which determines the blood pressure based on the sound information outputted by the K-sound sensor and the cuff pressure information outputted by the pressure sensor. An electronic blood pressure measurement method that automatically measures blood pressure, and a method that simply pressurizes the artery with a cuff without using a K-sound sensor, listens for the occurrence and disappearance of arterial sounds with a stethoscope, and when the arterial sounds occur and disappear. An auscultatory method is used to measure blood pressure by looking at a pressure gauge (pressure value).

(c) Problems to be solved by the invention In the electronic blood pressure measurement method described above, the sound information output by the K sound sensor is such that only electrical signals above a certain reference level (KSL) are taken into the CPU. It has become. Therefore, even though sound is actually being generated, if the sound signal is below the reference level due to the phloem condition of the subject, for example, it will not be measured and the blood pressure value cannot be determined. There are disadvantages such as In addition, external environmental conditions such as vibration and noise make sound detection unstable, making accurate measurement impossible.

On the other hand, according to the auscultation method, the arterial sounds (K sounds and Korotkoff sounds) are directly listened to with a stethoscope, which eliminates the disadvantages of the electronic measurement method, but on the other hand, arterial sounds cannot be accurately heard. However, there are disadvantages such as requiring skill, limiting the number of users, and requiring a separate stethoscope.

It is an object of the present invention to provide a blood pressure measuring device that solves the above-mentioned problems of the conventional blood pressure measuring device and can selectively use electronic measuring means and auscultation-type measuring means with a single measuring device. With the goal.

(d) Means and operation for solving the problem In order to achieve this object, the blood pressure measuring device of the present invention has the following configuration.

The blood pressure measuring device comprises a first blood pressure measuring means comprising a blood pressure determining means for determining blood pressure based on the sound signal detected by the sound detecting means and cuff pressure information detected by the pressure detecting means; A sound signal outputted by the sound detection means is outputted as a sound by the electroacoustic conversion means, and based on the sound output, a signal is inputted to the blood pressure determination means to determine whether or not the sound is generated or eliminated using an operation switch, thereby measuring the blood pressure. The blood pressure measuring means comprises two blood pressure measuring means, and a mode switching means for selecting the first blood pressure measuring means and the second blood pressure measuring means.

In a blood pressure measuring device having such a configuration, the measurer can select either the first measuring means (electronic automatic measuring means) or the second measuring means (auscultation type measuring means) by operating the mode switching means (manual). select.

As a result, two different measurement methods can be appropriately selected using a single measuring device, and appropriate measurements can be performed depending on the person being measured or the external environment, and blood pressure measurement can be performed with higher accuracy.

(E) Embodiment FIG. 1 is a block diagram showing a specific example of a circuit configuration of a blood pressure measuring device according to the present invention.

The cuff (arm cuff) 1 has a built-in sound sensor (microphone) 2 for detecting sound, and this cuff pressure is connected to a pressure pump 3, a pressure reducing exhaust valve 4, and a pressure sensor 5. The air system is configured.

When the start switch is turned on, the pressurizing pump 3 activates the CPU (central processing unit) 6.
Based on the command, the cuff pressure is increased, the brachial artery wrapped around the cuff pressure is compressed, and the pressure is increased to a level higher than the systolic blood pressure of the subject to achieve blood ischemia. After that, the cuff pressure is reduced to 2 to 3 by the pressure reducing exhaust valve 4.
The gas is evacuated at a slow speed of about mmHg/sec and the pressure is reduced.

The sound sensor 2 converts the detected sound into an electrical signal, and the amplifier 7 amplifies the sound.

The comparison circuit 8 compares the K sound signal with a reference voltage (KSL), and if the K sound signal is equal to or higher than the KSL level, the CPU 6
Outputs a sound signal.

The pressure sensor 5 is an electrical pressure gauge using a piezoelectric transducer or the like, and constantly detects changes in the pressure applied to the cuff 1, and its detection output (analog amount of cuff pressure) is amplified by an amplifier 9. Further, the A/D converter 10 converts the data into a digital value that can be easily taken in by the CPU 6.

The CPU 6 has a built-in memory for storing programs and measurement data, and also has a function of importing cuff pressure data and K sound data, a function of turning the pressure pump 3 0N10FF, and a function of determining blood pressure from the cuff pressure data and sound data. etc.

Furthermore, the determined blood pressure value is output from the CPU 6 and digitally displayed on the display 11.

The feature of this invention is that an auscultation type blood pressure measuring means (second measuring means described later) is added to an electronic blood pressure measuring means (first measuring means mentioned above), so that it has three functions. .

The auscultation type blood pressure measuring means includes an electroacoustic conversion means for converting the sound signal (electrical signal) outputted by the sound sensor 2 into sound and notifying the outside, and a sound generation/disappearance based on the K sound acoustics. It consists of a timing switch (operation switch) 16 for inputting to the CPU 6.

In the embodiment, the electroacoustic conversion means includes a case in which a sound signal detected by the K sound sensor 2 is audibly notified by a speaker 13 via a sound N adjuster 12, and an external output terminal 14 is provided on the meter. A case is illustrated in which a headphone 15 is connected to this terminal 14 and a sound is audibly notified through the headphone 15.

In addition, when carrying out the measurement, the stethoscope 18 may be used directly without using the electroacoustic transducer, and the measurer may listen to the arterial sound (K sound) using the stethoscope.

The timing switch 16 allows the measurer to: This is a manual switch for outputting that point in time to the CPU6.

The mode switching means 17 is a manual switch for switching between the first measuring means and the second measuring means.

FIG. 2 is a flowchart showing specific processing operations of the embodiment blood pressure measuring device.

When the power switch is turned on, the meter is initialized (hereinafter referred to as rsTIJ), the pressure pump 3 is activated based on the command from the CPU 6 (5T2), and the cafe is pressurized to the preset pressure setting value. (Sr3)
. Then, the pressurization operation is stopped when the cafe is pressurized to the pressurization set value and the brachial artery is ischemized (Sr1).

Thereafter, the exhaust valve 4 immediately starts slow exhausting (S
r5).

In Sr1, it is determined whether the first measuring means (electronic measuring means) is selected by the mode switching means (changeover switch) 17 or not.

Now, assuming that the measurer has previously selected the first measuring means with the mode selector switch 17, this determination is "YES".
Therefore, the sound information detected and output by the K sound sensor 2 is
As shown in the figure, the cuff pressure at the time when it is determined to be above KSL (standard value), that is, at time 2, is the systolic blood pressure/5YSI.
(SL) is determined (Sr1), this SYS 1 is displayed on the display II (Sr8), and the cuff pressure at the time when the K sound disappears (Kn-+) is detected and the diastolic blood pressure/D
IAL (Di) is determined (Sr1), and this DIAL
is displayed on the display 11 (STIO), the display 11
The measurement end mark is displayed (STII), and
The exhaust valve 4 rapidly depressurizes the cafe to atmospheric pressure (
ST12) The measurement by the first measuring means ends.

On the other hand, if the measurer selects the second measuring means (auscultation type measuring means) using the mode switching means 17, the determination of Sr1 becomes "No" and the blood pressure is measured by the second measuring means. .

At 5T13, it is determined whether the timing switch 16 has been turned on. Assuming that the K sound is not currently being heard from the speaker 13 (or headphones 15), the measurer does not press this timing switch 16, so this determination becomes "NO" and the process proceeds to the next step 5T14.

At 5T14, it is determined whether the current cuff pressure is below a preset constant reference pressure (for example, P r =50 mmHg). Now, assuming that the cuff pressure is 45 mmHg, the cuff has been decompressed to an extremely low pressure state without the occurrence of a K sound, and an abnormal condition can be inferred. Therefore, in such a case, the determination at 5T14 becomes "YES" and the measurement error is displayed on the display 11 (ST19).

On the other hand, if the current pressure in the cafe is 150 mmHg, sound is heard from the speaker 13, and the person taking the measurement turns on the timing switch 16, the determination of 5T14 is "
The judgment of 5T13 becomes ``YES'', and as shown in FIG.
YS2 (S2) is determined (ST15), and this 5YS2 is displayed on the display 11 (ST16).

Next, at 5T17, the timing switch 16 is turned OFF.
It is determined whether or not the timing switch 16 has been released, that is, whether the sound is no longer heard from the speaker 13 and whether the person taking the measurement has released the timing switch 16. Assuming that the sound is currently being heard from the speaker 13 and the person taking the measurement is holding down the timing switch 16, this judgment will be "No".
Move to 5T18.

In 5T1B, it is determined whether the current pressure in the cafe is below a preset constant reference pressure (for example, P z =20 mmHg). Now, assuming that the current pressure of the cuff is 20 mmHg or less, it would be unnatural for the sound to be heard up to this point of pressure, and an abnormal state of the instrument can be inferred.

Therefore, in this case, the determination of 5T18 is "YES" and a measurement error is displayed on the display 11 (ST19).
, end the measurement.

Conversely, if the current pressure in the cafe is 55 mmHg, no sound is heard from the speaker 13, and the person taking the measurement releases the timing switch 16 and tosses it to OFF, the 5T
The judgment of L8 is "No", the judgment of 5T17 is "YES", and at this point, that is, the cuff pressure at the near point of 7 in Fig. 3 is D.
IA2 (D2) is determined (ST20), and this D
IA2 is displayed on the display 11 (ST21), a measurement end mark is displayed on the display 11, and the measurement ends.

(F) Effects of the Invention In this invention, as described above, the second auscultation type blood pressure measuring means is added to the first electronic blood pressure measuring means, and the second measuring means is switched to the first measuring means by operating the measurement mode switching means. The second measurement means can be selectively used.

According to this invention, it is possible to select blood pressure measurement using two different measurement methods using a single measuring device, and the measurement function is significantly improved compared to conventional blood pressure monitors.

Therefore, it is possible to select the most optimal measurement method according to the patient's arterial sound state and measurement external conditions, etc., and to perform appropriate and accurate blood pressure measurement corresponding to the measurement conditions, achieving the purpose of the invention. It has excellent effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the circuit configuration of a blood pressure measuring device according to the present invention, FIG. 2 is a flowchart explaining specific processing operations of the blood pressure measuring device according to the embodiment, and FIG.
It is an explanatory diagram showing the state of blood pressure measurement. 2: Sound sensor, 5: Pressure sensor, 6: CPU,
8: Comparison circuit, 13: Speaker, 16
: timing switch, 17: mode switching means.

Claims (1)

[Claims] (1) A first blood pressure measuring means comprising a blood pressure determining means for determining blood pressure based on the K sound signal detected by the K sound detection means and cuff pressure information detected by the pressure detection means, and the K sound detection means. A second method for measuring blood pressure by acoustically outputting the K sound signal outputted by the means by the electroacoustic converting means, and outputting a signal indicating generation and extinction of the K sound based on the acoustic output to the blood pressure determining means using an operation switch. A blood pressure measuring device comprising a blood pressure measuring means and a mode switching means for selecting between the first blood pressure measuring means and the second blood pressure measuring means.