JP2003275182A - Boosting device for cuff and hemadynamometer with the boosting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a boosting device for a cuff capable of reducing the number of parts, easily maintaining a reliability, and shortening a boosting time and a hemadynamometer with the boosting device. <P>SOLUTION: In these boosting device for the cuff and the hemadynamometer with the boosting device, valve devices 4, 5, and 6 are installed in a fluid feed passage between the cuff 1 and a pressurizing pump 8, a fluid feed passage between the pressurizing pump 8 and a pressurizing container 7, and a fluid feed passage between the cuff 1 and the pressurizing container 7. A pressure sensor 9 is connected to fluid feed passages for connecting the valve devices 4 and 5 to the pressurizing pump 8 to use a low power valve device, and easily maintain the reliability of the entire boosting device and hemadynamometer. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a booster for boosting a cuff that compresses a part of a living body when measuring blood pressure, and a sphygmomanometer including the booster.

[0002]

2. Description of the Related Art When measuring blood pressure, air is pressure-fed to a cuff wrapped around a part of a living body such as an upper arm to pressurize the air,
As a result, a part of the living body is compressed, while the air is gradually exhausted from the inside of the cuff to compress the pressure (cuff pressure).
Is depressurized at a predetermined speed (for example, 2 to 3 mmHg / sec), and the pressure vibration (pulse wave) of the cuff that is generated in synchronization with the detection of Korotkoff sound that is generated and disappears with the change of the cuff pressure in the depressurization process and the heartbeat is generated. By detecting the change in the size of
An electronic sphygmomanometer for determining blood pressure (maximum blood pressure, minimum blood pressure) has been conventionally proposed. In such an electronic sphygmomanometer, in order to shorten the time required for blood pressure measurement, it is desirable to shorten the pressurization time of the cuff that is not directly related to blood pressure measurement as much as possible.

In Japanese Patent Publication No. 6-57200, a pressure vessel (tank) for storing compressed air is used.
When the pressure of the cuff is increased, the pressure of the cuff is rapidly increased by releasing the pre-stored compressed air to the cuff, and if the target cuff pressure is not reached only by the release of this compressed air, the fluid is transferred by the solenoid opening / closing valve. A sphygmomanometer is disclosed that includes a booster device that shortens the boosting time by switching the path and pumping air from an electric pump (pressurizing pump).

However, in such a conventional sphygmomanometer for shortening the pressurizing time of the cuff, as shown in FIG. 3 (Japanese Patent Publication No. 6-572).
As shown in FIG. 1 of No. 00), two independent pressure sensors are required to detect the pressure of the cuff and the pressure of the pressure container (tank). Since the pressure sensor requires accurate pressure detection, in the conventional booster, electronic circuits related to the two pressure sensors are required for each (that is, the number of electronic components requiring accuracy increases). , They had to be adjusted and mounted. Therefore, it has been difficult to maintain the reliability of the conventional cuff pressurizing device and the sphygmomanometer including the same.

Further, in the structure of the piping (fluid transfer path) of the sphygmomanometer for shortening the pressurization time of the conventional cuff, the flow direction of the compressed air flowing through the electromagnetic on-off valve has been changed. That is, FIG. 3 (first of Japanese Patent Publication No. 6-57200)
As shown in the drawing), the direction in which the compressed air flows through the electromagnetic on-off valve MV1 is different between the case where the compressed air is accumulated in the tank from the electric pump and the case where the compressed air is discharged from the tank to the cuff. Therefore, when an electromagnetic on-off valve that operates at low power and consumes less power is used as the electromagnetic on-off valve MV1, the dynamic pressure of the compressed air may vary depending on the direction of the compressed air (pressurized air) flowing through the valve. It was difficult to keep the valve open under the influence of (pressure received from fluid).

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the number of parts and maintain reliability by using a single pressure sensor, and a pressure increasing device for a cuff capable of shortening the pressure increasing time. And to provide a sphygmomanometer equipped with the same. Furthermore, by setting the flow direction of the compressed air flowing in the electromagnetic on-off valve to be one direction, the electromagnetic on-off valve that operates at low power can be used, and the pressure increasing device of the cuff capable of shortening the pressure increasing time and the blood pressure provided with the device. To provide the total.

[0007]

The above objects can be achieved by the inventions of (1), (2), (3), (4), (5), (6) and (7) below. (1) A pressure vessel for accumulating compressed air, a pressure pump for supplying compressed air to the pressure vessel, a cuff for compressing a part of a living body, and between the cuff and the pressure pump And a second valve device provided in a fluid transfer path between the pressure vessel and the pressurizing pump. The first valve device and the second valve device are provided in the fluid transfer path between the pressure vessel and the pressurizing pump. The valve device is connected via the fluid transfer passage on the side of the pressurizing pump, and the pressure sensor is connected to the fluid transfer passage between the first valve device, the second valve device and the pressurizing pump. Cuff booster characterized by. (2) A third valve device provided in a fluid transfer path between the cuff and the pressure vessel is provided, and the third valve device and the first valve device are connected via the fluid transfer path on the cuff side. The third valve device and the second valve device are connected via a fluid transfer path on the pressure container side, and the pressure increasing device for the cuff according to (1) above. (3) The slow speed exhaust valve and the quick exhaust valve are connected to a fluid transfer path between the cuff, the first valve device and the third valve device. Cuff booster. (4) Compressed air accumulating means for accumulating compressed air, compressed air supplying means for supplying compressed air to the compressed air accumulating means, cuff for compressing a part of a living body, the cuff and the compression A first valve means provided in a fluid transfer path between the air supply means and a second valve means provided in a fluid transfer path between the compressed air storage means and the compressed air supply means;
The first valve means and the second valve means are connected via a fluid transfer path on the side of the compressed air supply means, and the pressure detection means includes the first valve means, the second valve means and the compressed air supply means. A pressure increasing device for a cuff, characterized in that it is connected to a fluid transfer path between the two. (5) A third valve means is provided in a fluid transfer path between the cuff and the compressed air accumulating means, and the third valve means and the first valve means are provided.
The valve means is connected via the fluid transfer path on the cuff side,
The valve means and the second valve means are connected via a fluid transfer path on the compressed air accumulating means side (4).
Cuff pressurizing device according to. (6) The above-mentioned (5), wherein the slow speed exhaust means and the quick exhaust means are connected to a fluid transfer path between the cuff, the first valve means and the third valve means. Cuff booster. (7) A sphygmomanometer including the cuff pressurizing device according to any one of (1) to (6).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a cuff pressurizing device of the present invention and a sphygmomanometer including the same will be described in detail based on preferred embodiments.

FIG. 1 is a block diagram of an air system and a measurement system of a cuff pressurizing device and a sphygmomanometer including the same according to an embodiment of the present invention.

The cuff 1 uses a tube (fluid transfer path) 17 for a slow exhaust valve 2, a rapid exhaust valve 3, a pressure sensor (pressure detector) 9, a first valve device (first air-cutoff valve) 4, and a first valve device. Three
It is connected to a valve device (third air-cutoff valve) 6.
The tube on the cuff 1 side of the first valve device (first air-cutoff valve) 4 and the third valve device (third air-cutoff valve)
The tubes on the side of the cuff 1 of 6 are connected. That is, the first valve device (first air-shutoff valve) 4 and the third valve device (third air-shutoff valve) 6 are connected via the tube (fluid transfer path) 17 on the cuff 1 side.

The air-storage tank (pressure vessel) 7 is a tu
The second valve device (second air-shutoff valve) 5 and the third valve device (third air-shutoff valve) 6 by the valve (fluid transfer path) 19.
It is linked to and. The tube on the side of the air-storage tank (pressure container) 7 of the second valve device (second air-shutoff valve) 5 and the air-storage tank (pressure container of the third valve device (third air-shutoff valve) 6) ) The tube on the 7 side is connected. That is, the second valve device (second air-cutoff valve) 5
And the third valve device (third air-cutoff valve) 6 is a tube (fluid transfer path) 19 on the side of the air-storage tank (pressure container) 7
Are connected via.

The pressurizing pump 8 is a tube (fluid transfer path) 1
8 the first valve device (first air-cutoff valve) 4 and the second
It is connected to a valve device (second air-cutoff valve) 5.
The tube on the pressure pump 8 side of the first valve device (first air-cutoff valve) 4 and the tube on the pressure pump 8 side of the second valve device (second air-shutoff valve) 5 are connected. .
That is, the first valve device (first air-shutoff valve) 4 and the second valve device (second air-shutoff valve) 5 are the pressurizing pump 8
They are connected via a tube (fluid transfer path) 18 on the side. The pressure sensor 9 includes a first valve device (first air-cutoff valve) 4 and a second valve device (second air-cutoff valve) 5.
And a tube that connects the pressure pump 8 (fluid transfer path)
It is connected to 18 so that the pressure in the tube (fluid transfer path) 18 can be detected.

The slow speed exhaust valve 2 is a self-standing slow speed exhaust valve capable of controlling the depressurizing speed of the cuff 1 at the time of measurement to 2-3 mmHg / sec. The quick exhaust valve 3 is a normally-open type electromagnetic opening / closing valve and is controlled by the CPU 13. As the pressure sensor 9, for example, a diaphragm type converter using a strain gauge or a semiconductor pressure converting element is used. First valve device (first air-shutoff valve) 4, second valve device (second air-shutoff valve) 5, third
The valve device (third air-cutoff valve) 6 is a normally closed type electromagnetic on-off valve, and is controlled by the CPU 13. The pressurizing pump 8 is a diaphragm-type pressurizing pump driven by a dry battery 21 and is controlled by the CPU 13. The pressurized container (air-storage tank) 7 is a tank having a rigidity of withstanding compressed air pressure and having a volume of about 200 to 500 cc.

The analog output of the pressure sensor 9 is an amplifier 10
Is amplified in. The analog output from the amplifier 10 is input to a low-pass filter 11 having a cutoff frequency of about 15 Hz that cuts pump noise during pressurization and high-frequency noise that is clock noise generated by the CPU 13. The analog output of the low pass filter 11 is converted into a digital value by the A / D converter 12. CPU13
Takes in the output of the A / D converter 12 periodically (every 20 ms). The pressure sensor 9 is the tube 1 as described above.
Although the pressure in 8 is detected, both the cuff pressure and the pressure in the air storage tank can be detected by opening and closing the three air shutoff valves, as will be described later in the flowchart of the processing operation.

The CPU 13 separates the pulse wave signal from the input pressure signal (cuff pressure signal) and stores the cuff pressure signal and the pulse wave signal, and calculates the pulse wave amplitude from the stored pulse wave signal. It has a pulse wave level detection function and a function of determining the systolic blood pressure and the diastolic blood pressure based on the pulse wave level and the cuff pressure signal. Further, it has a function of displaying the determined maximum blood pressure and minimum blood pressure on the display unit 14. Power SW (switch)
Reference numeral 15 is a switch for connecting the dry battery 21. Terminal 1
From 51, the quick exhaust valve 3, the first air-cutoff valve 4,
Power is supplied to the second air-shutoff valve 5, the third air-shutoff valve 6, and the pressurizing pump 8. From the terminal 152, the power stabilized by the power stabilizing unit is supplied to the pressure sensor 9, the analog amplifier 10, the low-pass filter 11, the A / D converter 12, the CPU 13, and the display 14. The measurement SW (switch) 16 is C when starting the blood pressure measurement.
It is a switch for inputting a measurement (measurement) start to the PU 13.

FIG. 2 is a flow chart showing an outline of a concrete processing operation of the cuff pressurizing device and the sphygmomanometer including the same according to the embodiment of the present invention.

When the power switch SW15 is turned on, the first air-
The shutoff valve 4 is opened, and the output of the pressure detection unit (pressure sensor) 9 is set to 0 (ST1). Then the first
The air shutoff valve 4 is closed, the second air shutoff valve 5 is opened (ST2), and the pressure pump 8 is turned on (ST
3). When the pressurizing pump 8 is turned on and the supply (supply) of the compressed air (compressed air) to the air storage tank 7 via the tube 18 is started, the pump drive time monitoring timer is started in advance. Set specified time (predetermined time)
It is checked whether or not has passed (ST4). During the air supply (supply) of the pressurized air to the air storage tank 7, the pressure sensor 9 detects the pressure of the air storage tank 7 via the tubes 18 and 19, and the compressed air is compressed. The accumulation state in the storage tank 7 is monitored. When a predetermined time has elapsed, the pressurizing pump is turned off (ST5), the second air-cutoff valve 5 is closed (ST6), and the pump drive time monitoring timer is stopped. Here, although the supply of the pressurized air to the air storage tank 7 is controlled by time, the pressure inside the air storage tank 7 detected by the pressure sensor 9 is a predetermined pressure (for example, 400 mmH).
It is also possible to control by pressure so that the pressurizing pump is turned off when g) is reached.

When the measurement SW16 is turned on (ST
7), the quick exhaust valve 3 is closed (ST8), the first air-cutoff valve 4 and the third air-cutoff valve 6 are opened (ST9),
While the cuff pressure is detected by the pressure sensor 9 via the tubes 17 and 18, the compressed air inside the air storage tank 7 is sent (supplied) to the cuff through the tubes 17 and 19.
When the cuff pressure reaches the first predetermined pressure (for example, 100 mmHg), the third air-cutoff valve 6 is closed (ST1.
1). Then, turn on the pressure pump 8 (ST1
2) The cuff pressure is increased by supplying pressurized air from the pressure pump through the tubes 17 and 18. Pressure sensor 9
When it is detected that the cuff pressure has reached the second set pressure equal to or higher than the systolic blood pressure (ST13), the pressurizing pump is turned off (ST14). In addition, here, the compressed air in the air storage tank 7 is fed to the cuff when the cuff pressure detected by the pressure sensor 9 is the first predetermined pressure (for example, 1).
It is controlled so as to stop when the pressure becomes 00 mmHg), but when the rate of increase in the cuff pressure detected by the pressure sensor 9 becomes small, the compressed air in the air storage tank 7 is fed to the cuff. Can also be controlled to stop.

The set pressure at which the cuff pressure is higher than the systolic blood pressure (second
After the pressurizing pump is turned off after reaching the set pressure), the cuff pressure is reduced by the slow speed exhaust valve 2 at 2 to 3 mmHg / sec. In this depressurization process, extraction of the pulse wave signal is started from the cuff pressure signal detected by the pressure sensor 9 via the tubes 17 and 18 (ST15), and the pulse wave amplitude is calculated as the pulse wave level (ST16). The calculated pulse wave amplitude is stored together with the cuff pressure at that time. The pulse wave amplitudes for each beat are compared, and the maximum value of the pulse wave amplitude (maximum pulse wave amplitude) is detected (ST17) and stored (ST18). From the stored maximum pulse wave amplitude, pulse wave amplitudes corresponding to the minimum blood pressure and the maximum blood pressure are calculated. The cuff pressure at the time when the pulse wave amplitude at each beat becomes the amplitude corresponding to the minimum blood pressure is detected as the minimum blood pressure (ST19). When the minimum blood pressure is detected, the quick exhaust valve 3 is opened (ST20), and the cuff pressure is reduced to atmospheric pressure. Next, the cuff pressure at the time when the amplitude corresponding to the systolic blood pressure is obtained from the stored pulse wave amplitude is detected as systolic blood pressure (ST21), and is displayed on the display (LCD) 14 together with the detected diastolic blood pressure. (ST22).

Thereafter, returning to ST2, the first air-shutoff valve 4 is closed, the second air-shutoff valve 5 is opened, the pressurizing pump 8 is turned on (ST3), and the compressed air is fed for a predetermined time. , Air for increasing pressure at the time of the next measurement is stored in the air-storage tank 7 and the input of the measurement SW 16 is waited for.

The preferred embodiments of the pressure increasing device for a cuff of the present invention and the sphygmomanometer equipped with the same have been described above. The major difference between the preferred embodiment of the present invention and the conventional example is from the comparison of FIGS. 1 and 3. As is apparent, the present invention has three valve devices (air-cutoff valves) and one pressure sensor, and the conventional example has two valve devices (air-cutoff valves) and two pressure sensors. It is a point.

By the way, since the valve device controls only opening and closing, it is not necessary to use many electronic parts to be adjusted, so that the possibility of failure is small. However, since a pressure sensor requires accurate pressure detection, an adjusted amplifier, low-pass filter, A
Many electronic components such as a / D converter are required, and the possibility of failure is generally greater than that of the valve device.

Therefore, in the present invention, the entire cuff pressurizing device and sphygmomanometer have less possibility of failure as compared with the conventional example, and it is easy to maintain reliability.

Further, in the arrangement of the tube (fluid transfer path) and the valve device of the present invention, three valve devices (air-cutoff valve) are used.
Compressed air (pressurized air) flows in one direction in any of 4, 5, and 6. That is,
The compressed air flows from the pressure pump 8 side to the cuff 1 side in the first air-shutoff valve 4, and from the pressure pump 8 side to the air storage tank 7 side in the second air cutoff valve to the third air cutoff. The valve does not switch from the air storage tank 7 side to the cuff 1 side, and this direction is not switched. Therefore, depending on the flow direction of the compressed air, it is difficult to maintain the valve in an open state under the influence of the dynamic pressure of the compressed air (pressure received from the fluid). The air shutoff valve) can also be used by arranging it so as not to be adversely affected by the dynamic pressure.

The cuff pressurizing device and the sphygmomanometer including the same according to the present invention have been described based on the preferred embodiments.
The present invention is not limited to these. In particular, the sphygmomanometer of the embodiment determines the blood pressure (maximum blood pressure, minimum blood pressure) by detecting a change in the magnitude of pressure vibration (pulse wave) of the cuff that occurs during the depressurization process of the cuff pressure. The blood pressure (maximum blood pressure, minimum blood pressure) may be determined by the Korotkoff sound that is generated and disappears with the pulsation.

[0026]

As described above, in the pressure increasing device for a cuff and the sphygmomanometer using the same according to the present invention, one pressure sensor can detect the cuff pressure and the pressure of the pressure vessel. Since the air system is configured as described above, electronic components that are required to have a higher accuracy than those in which the cuff pressure and the pressure of the pressurized container are detected separately by using two pressure sensors (a plurality of pressure sensors). The score of is small.
Therefore, it is easy to maintain the overall reliability of the cuff pressurizing device configured by adjusting them and the sphygmomanometer using the same. Further, by appropriately arranging the three electromagnetic on-off valves and the fluid transfer path, the flow direction of the compressed air flowing through the electromagnetic on-off valves can be set to one direction, so that the electromagnetic on-off valves operating at low power should be used. You can

[Brief description of drawings]

FIG. 1 is a block diagram of an air system and a measurement system of a cuff pressurizing device and a sphygmomanometer including the same according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an outline of a specific processing operation of the cuff pressurizing device and the sphygmomanometer including the same according to the embodiment of the present invention.

FIG. 3 is a block diagram of an air system and a measurement system of a conventional cuff pressurizing device and a sphygmomanometer including the same.

[Explanation of symbols]

1 ... Cuff 2 ... Slow speed exhaust valve 3 ... quick exhaust valve 4 ... First valve device (first air-cutoff valve) 5 ... Second valve device (second air-cutoff valve) 6 ... Third valve device (third air-cutoff valve) 7 ... Pressure vessel (air storage tank) 8 ... Pressure pump (electric pump) 9 ... Pressure sensor 10 ... Analog amplifier 11 ... Low-pass filter 12 ... A / D converter 13 ... CPU 14 ... Display (LCD) 15 ... Power switch 151, 152 ... Terminal 16 ... Measurement switch 17, 18, 19 ... Tube (fluid transfer path) 20 ... Power supply stabilization unit 21 ... Batteries

Claims (7)

[Claims] 1. A pressure vessel for storing compressed air, a pressure pump for supplying compressed air to the pressure vessel, a cuff for compressing a part of a living body, the cuff and the pressure pump. A first valve device provided in a fluid transfer path between the pressure vessel and the pressurizing pump, and a second valve device provided in a fluid transfer path between the pressure vessel and the pressurizing pump. The second valve device is connected via the fluid transfer passage on the pressure pump side, and the pressure sensor is connected to the fluid transfer passage between the first valve device, the second valve device and the pressure pump. Cuff booster characterized by having. 2. A third valve device provided in a fluid transfer path between the cuff and the pressure vessel, wherein the third valve device and the first valve device are connected via a fluid transfer path on the cuff side. 2. The cuff pressurizing device according to claim 1, wherein the third valve device and the second valve device are connected via a fluid transfer path on the pressure vessel side. 3. The slow speed exhaust valve and the quick exhaust valve are connected to a fluid transfer path between the cuff, the first valve device and the third valve device. Cuff booster as described. 4. Compressed air storage means for storing compressed air,
Compressed air supply means for supplying compressed air to the compressed air storage means, a cuff for compressing a part of a living body, and a fluid transfer path between the cuff and the compressed air supply means are provided. A first valve means and a second valve means provided in a fluid transfer path between the compressed air accumulating means and the compressed air supply means, the first valve means and the second valve means including the compressed air; It is connected via a fluid transfer path on the side of the air supply means, and the pressure detection means is connected to a fluid transfer path between the first valve means, the second valve means and the compressed air supply means. And a cuff booster. 5. A third valve means provided in a fluid transfer path between the cuff and the compressed air accumulating means, wherein the third valve means and the first valve means are the fluid transfer path on the cuff side. Connected via
5. The cuff pressurizing device according to claim 4, wherein the third valve means and the second valve means are connected via a fluid transfer path on the compressed air accumulating means side. 6. The slow speed exhaust means and the rapid exhaust means are connected to a fluid transfer path between the cuff, the first valve means and the third valve means. Cuff booster as described. 7. A sphygmomanometer including the cuff pressurizing device according to claim 1.