JP3326201B2 - Pressure drop rate control device in blood pressure monitor and pulse wave monitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure drop speed control device for a sphygmomanometer and a pulse wave monitor, and more particularly to a device for controlling a pressure drop rate using only one exhaust adjustment valve regardless of the thickness of a subject's arm or pulse rate. It relates to a new improvement for controlling the pressure drop rate in stages.

[0002]

2. Description of the Related Art In this type of blood pressure or pulse wave measurement conventionally used, generally, 3 to 4 mmH per pulse is used.
It is said that it is better to reduce the pressure at the speed of g, but the conventional pressure reduction control of the sphygmomanometer manually or automatically switches a plurality of exhaust valves with different exhaust speeds, or fixed or semi-fixed constant speed Exhaust valves were used.

[0003]

Since the conventional blood pressure or pulse wave measurement has been performed as described above, the following problems exist. That is, the thickness of the arm of the subject varies, and the pressure applied to the measurement site of the subject is not constant. Therefore, in the conventional method, appropriate control of the decompression rate according to the subject is performed by one. It was difficult to perform the operation easily and at a constant speed with the individual exhaust control valves.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In particular, the pressure of the subject can be continuously adjusted with only one exhaust control valve regardless of the thickness of the arm or the pulse rate of the subject. An object of the present invention is to provide a pressure drop speed control device in a sphygmomanometer and a pulse wave meter that controls the drop speed.

The pressure drop rate control device in the sphygmomanometer and the pulse wave monitor according to the present invention energizes electromagnetic means for operating an elastic body that closes an exhaust port of an exhaust adjustment valve provided in communication with the air know of the cuff, In a pressure drop rate control device in a sphygmomanometer and a sphygmograph in which the exhaust from the exhaust port is controlled by controlling the energization, a pressurizer and a pressure detector connected to the exhaust regulating valve and the air know A pulse wave detector connected to the pressure detector, a microcomputer connected to the pressure detector and the pulse wave detector, and a power controller connected between the microcomputer and an exhaust gas regulating valve. Controlling the energization of the electromagnetic means based on detection signals from the pressure detection unit and the pulse wave detection unit, and forming a first rough surface on a surface of the elastic body;
The rough surface is configured to be in contact with the exhaust port, and power is supplied to electromagnetic means for operating an elastic body that closes the exhaust port of the exhaust adjustment valve provided in communication with the air know of the cuff. In a pressure drop rate control device in a sphygmomanometer and a pulse wave monitor that controls the exhaust from the exhaust port by controlling, a pressurizer and a pressure detector connected to the exhaust regulating valve and the air know, A pulse wave detection unit connected to the pressure detection unit, a microcomputer connected to the pressure detection unit and the pulse wave detection unit, and a power control unit connected between the microcomputer and the exhaust gas adjustment valve,
The energization to the electromagnetic means is controlled based on the detection signals from the pressure detection unit and the pulse wave detection unit, and a second rough surface is formed around the exhaust port, and the second rough surface is formed on the elastic body. The configuration is such that they are in contact with each other.

[0006]

In the pressure drop rate control device in the sphygmomanometer and the pulse wave monitor according to the present invention, first, electric power capable of completely closing the exhaust port is supplied from the power control circuit to the excitation coil of the exhaust adjustment valve in accordance with an instruction from the microcomputer. Keep it. Next, pressurized air is supplied to the air system such as the air know of the system by using a pressurizer to supply the pressure air required for blood pressure or pulse wave measurement. The microcomputer confirms that the required pressure has been reached by the detection signal of the pressure detection unit, stops the operation of the pressurizer, and gradually reduces the power supplied from the power control circuit. After that, the evacuation from the minute gap between the evacuation port and the elastic body starts, and the pressure decreases.The microcomputer detects the decrease in pressure every unit time, and the excitation coil reduces the pressure at a constant speed. Is varied. Furthermore, when the pressure gradually decreases and the pressure of the air know falls below the systolic blood pressure, the pressure detecting unit compares the residual pressure of the pressure initially pressurized by the pressurizer with the dilation pressure of the blood vessel due to the pulse wave. The combined pressure signal is detected. From the pressure signal, only a pulse wave signal can be detected by a pulse wave detection unit using a filter. After detecting the pulse wave signal, the microcomputer detects the pressure difference between each pulse wave, and reduces the power supply of the exciting coil from the power control unit exponentially, and changes the size of the arm of the subject to be measured. Regardless, the pressure drop at a constant speed can always be maintained.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a blood pressure monitor and a pulse wave monitor according to a preferred embodiment of the present invention. FIGS. 1 to 7 show a pressure drop rate control device in a sphygmomanometer and a pulse wave monitor according to the present invention.

In FIG. 1, reference numeral 1 designates an air know provided on a cuff 1A. The air know 1 communicates with a pressurizer 2, a pressure detector 3, and an exhaust regulating valve 4, and This constitutes an air system.

The first detection signal 3a of the pressure detection unit 3 is applied to the microcomputer 5 and the second detection signal 3b is applied to the pulse wave detection unit 6. The second detection signal 6a is also applied to the microcomputer 5.

A first control signal 5a from the microcomputer 5 is applied to control the pressurizer 2,
The second control signal 5b of the microcomputer 5 is applied to the power control unit 7, and the controlled power 7a from the power control unit 7 is supplied to the exciting coil 4a of the exhaust regulating valve 4.
Has been applied.

The exhaust regulating valve 4 is constructed as shown in FIG. 2. An elastic body 4c is provided at the tip of a plunger 4b which enters and exits by the exciting coil 4a. The exhaust port 4e formed in communication with the plug 4d is joined so as to form a slight gap, and is configured to be openable and closable. The electromagnetic means 4A is constituted by the exciting coil 4a and the plunger 4b.

The elastic member 4c and the exhaust port 4e are formed with a small gap between them as described above, as shown in FIGS. 3, 4 and 5, and in FIG. Has a first rough surface 4cA. Further, in the configuration of FIG. 4, a second rough surface 4eA is formed around the exhaust port 4e, and in the configuration of FIG. 5, a slope 4cB is formed on the surface of the elastic body 4c. Therefore, the elastic body 4 with respect to the exhaust port 4e
Due to the strength of the pressure c, the air is exhausted through the small gaps formed by the rough surfaces 4cA and 4eA and the slope 4cB.

Next, a description will be given of a case where actual measurement is performed in the above configuration. First, when the elastic body 4c is closed with a force that does not distort, there is originally a very small gap between the elastic body 4c and the exhaust port 4e, and the pressurized air is exhausted from here. As the force for closing is increased, the elastic body 4c is distorted, gradually closing the above-mentioned minute gap, reducing the amount of exhaust, and finally stopping the exhaust completely. Conversely, if the blockage is initially closed with a strong force and the force is gradually relaxed, the amount of the initially stopped exhaust gas increases due to the expansion (apparent) of the minute gap.

In actual blood pressure measurement or pulse wave measurement, a force capable of completely closing the minute gap of the exhaust port 4e is applied to the elastic body 4c.
In addition, when a pressure sufficiently higher than the systolic blood pressure is applied to the blood vessel at the measurement site and the force on the elastic body 4c is reduced, a minute gap in the exhaust port 4e is opened, the exhaust starts, and the pressure decreases. However, if the size of the minute gap is constant, the pressure decreases exponentially. If the force applied to the elastic body 4c at this time decreases exponentially, a substantially linear decompression rate is obtained. Is obtained.

Next, the operation will be described more specifically. First,
An electric power 7a capable of completely closing the exhaust port 4e in the excitation coil 4a of the exhaust adjustment valve 4 according to an instruction from the microcomputer 5.
Is supplied from the power control unit 7. Next, the pressurizer 2 supplies pressurized air necessary for blood pressure or pulse measurement to an air system such as the air know 1 of the system. The microcomputer 5 confirms that the required pressure has been reached by the first detection signal 3a of the pressure detector 3, stops the operation of the pressurizer 2, and gradually reduces the power supplied from the power controller 7. Thereafter, the evacuation from the minute gap between the evacuation port 4e and the elastic body 4c starts, and the pressure decreases. However, the microcomputer 5 detects the decrease in the pressure every unit time so that the pressure decreases at a constant speed. The amount of current supplied to the exciting coil 4a is varied.

Further, when the pressure gradually decreases and the pressure of the air know 1 falls below the systolic blood pressure, the pressure detecting unit 3 supplies the remaining pressure of the pressure initially pressurized by the pressurizer 2 and dilation of the blood vessel by the pulse wave. The second detection signal 3b combined with the pressure is detected. From the signal 3b, only the pulse wave signal 6a can be detected by the pulse wave detector 6 using a filter (not shown). After detecting the pulse wave signal 6a, the microcomputer 5 detects the pressure difference between the respective pulse waves and decreases the power supply from the power control unit 7 to the exciting coil 4a in an exponential manner. Regardless of the size of the arm, the pressure drop at a constant speed can always be maintained.

As shown in FIG. 6, the state of the power control by the power control unit 7 is a first area A controlled by a pressure difference per unit time before a pulse wave is generated. The second area B is controlled by the pressure difference immediately before the rise of each pulse wave. FIG. 7 shows the relationship between the air supply pressure and time for the change in the energized power, the controlled pressure drop and the natural pressure drop, and it is clear that the pressure drops at a constant rate by the control according to the present invention. It has become.

[0018]

The pressure drop velocity control device in the sphygmomanometer and the pulse wave monitor according to the present invention is configured as described above, so that the following effects can be obtained. That is,
Since the pressure change at each pulse is detected, the power supplied to the exciting coil is changed exponentially, and the amount of closing of the minute gap of the elastic body by the driving force of the exciting coil is changed. Regardless of the pulse rate, the pressure drop speed can be controlled in a stepless manner with only one exhaust adjustment valve. Therefore, the configuration of this type of device can be simplified, manufacturing can be facilitated, and the reliability can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a pressure drop rate control device in a sphygmomanometer and a pulse wave meter according to the present invention.

FIG. 2 is an enlarged configuration diagram showing the exhaust control valve of FIG. 1;

FIG. 3 is an enlarged configuration diagram illustrating a main part of FIG. 2;

FIG. 4 is a configuration diagram showing another embodiment of FIG. 3;

FIG. 5 is a configuration diagram showing another embodiment of FIG. 3;

FIG. 6 is a characteristic diagram showing a pressure control state.

FIG. 7 is a characteristic diagram showing a pressure drop.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 air know 1A cuff 2 pressurizer 3 pressure detector 3a, 3b detection signal 4 exhaust adjustment valve 4A electromagnetic means 4c elastic body 4e exhaust port 4cB slope 4eA second rough surface 4cA first rough surface 5 microcomputer 6 pulse wave detector

Claims (2)

(57) [Claims] An electromagnetic means (4A) for operating an elastic body (4c) for closing an exhaust port (4e) of an exhaust regulating valve (4) provided in communication with an air know (1) of a cuff (1A). The power is supplied to the exhaust port (4e) by controlling the power supply.
Pressure control device in a sphygmomanometer and a sphygmomanometer for controlling exhaust from a pressure sensor (2) and a pressure detector (2) connected to the exhaust regulating valve (4) and the air know (1). 3), a pulse wave detector (6) connected to the pressure detector (3), and a microcomputer (5) connected to the pressure detector (3) and the pulse wave detector (6).
A power control unit (7) connected between the microcomputer (5) and the exhaust control valve (4); and detection signals (3a) from the pressure detection unit (3) and the pulse wave detection unit (6). , 3
b) controlling the energization of the electromagnetic means (4A) based on the first rough surface (4c) on the surface of the elastic body (4c).
A), wherein the first roughened surface (4cA) is configured to be in contact with the exhaust port (4e). 2. An electromagnetic means (4A) for operating an elastic body (4c) for closing an exhaust port (4e) of an exhaust regulating valve (4) provided in communication with the air know (1) of the cuff (1A). The power is supplied to the exhaust port (4e) by controlling the power supply.
Pressure control device in a sphygmomanometer and a sphygmomanometer for controlling exhaust from a pressure sensor (2) and a pressure detector (2) connected to the exhaust regulating valve (4) and the air know (1). 3), a pulse wave detector (6) connected to the pressure detector (3), and a microcomputer (5) connected to the pressure detector (3) and the pulse wave detector (6).
A power control unit (7) connected between the microcomputer (5) and the exhaust control valve (4); and detection signals (3a) from the pressure detection unit (3) and the pulse wave detection unit (6). , 3
b) controlling the energization of the electromagnetic means (4A) based on the second rough surface (4e) around the exhaust port (4e).
(A) is formed, and the second rough surface (4eA) is configured to be in contact with the elastic body (4c).