JPH11290283A - Sphygmomanometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the pulsation of a sphygmomanometer by forming a projecting portion tilting smoothly at the circumference of a rotor and pressing it sequentially from the inlet side to the outlet side while contact-sliding an air chamber. SOLUTION: When a rotor rotates and a projecting portion 17 moves, as air in an outlet 15a is compressed by the projecting portion 17, the air is exhausted from an outlet 15a. An air chamber 7a and the other air chamber 7b are connected to an inlet 13a by a communicating section 19. When the projecting portion 17 comes to the position of the air chamber 7b that blocks the inlet 13b and compresses the air chamber, an inlet 13a side air chamber of the air chamber 7a is extended and expanded by the communicating section 19 and forces air to flow in. As air can be sucked while exhausting from the two air chambers, immediately after one exhaustion ends, next exhaustion can be made, and while one air chamber is exhausting air, the other air chamber also exhausting air. Therefore, pulsation, the size of pulsation that is indicated by a difference between a maximum value and a minimum value of a pulse wave, can be reduced to about 40% of conventional sizes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sphygmomanometer using a pump device with little pulsation.

[0002]

2. Description of the Related Art A general sphygmomanometer has an appearance as shown in FIG. 5 and a structure as shown in FIG.

When the sphygmomanometer removes the main body cover 79, there are an electromagnetic valve 87, a display panel 81, a control circuit 93, a small pump device 91, a pressure sensor 89, a slow leak valve 85, a cuff band 83 and a small pump device. The hollow tube 95 connects the 91, the slow leak valve 85, the electromagnetic valve 87, and the pressure sensor 89.

[0004] After the power is supplied to the sphygmomanometer, the measurement switch is turned on, so that the small-sized pump device performs a pumping operation and rapidly sends air to the cuff band to pressurize the cuff band. When the pressure sensor detects that the cuff band has been pressurized to the set value, the small pump device is stopped, and the pressure in the cuff band is gradually reduced by slowly discharging air through a slow leak valve. The blood pressure value and pulse are measured while measuring the pressure change. When the measurement is completed, the solenoid valve is released to quickly exhaust the air remaining in the cuff band. Then, the measurement result is displayed on the display panel.

[0005] As a small pump device used in these sphygmomanometers, there is one disclosed in Japanese Patent No. 25551757. Referring to FIG. 7, reference numeral 101 denotes a small DC motor, and 103 denotes an output shaft of the small DC motor 101. Numeral 105 denotes a case attached to the output shaft surface of the small DC motor 101. Reference numeral 107 denotes a collar attached to the output shaft 103.
03 with a predetermined angle, and its tip is the output shaft 1
The drive shaft 109 is mounted so as to be on the central axis of the drive shaft 03. 111 is a disk-shaped driving body, 113 is a diaphragm body, 115 is a bell-shaped diaphragm part extending downward from the diaphragm body 113 and integrally formed, and 117 is at the center thereof. A driving unit 119 is a cylindrical valve body extending upward from the center of the diaphragm 113 and integrally formed. The driving unit 117 is pressed into a hole of the driving body 111 and held. Reference numeral 121 denotes a lid, and the lid 121 is fixed to the case 105 with the diaphragm 113 interposed therebetween. The space between the lid 121 and the diaphragm 115 forms pump chambers 123a and 123b. Reference numeral 125 denotes a valve chamber formed upward in the center of the lid 121, and 127 denotes an exhaust port. The valve body 119 is configured to contact the inner peripheral surface of the valve chamber 125 to close the passage. Reference numeral 129 denotes a spherical valve element, and a plurality of intake holes 13 around the valve element.
1 is formed.

In the above-described small pump device, when the small DC motor 101 is energized and the output shaft 103 is rotated, the drive shaft 109 is also rotated together with the collar 107, whereby the drive body 111 makes a countersunk movement and the diaphragm body 113 is moved. Is vertically vibrated, and the volume of the pump chamber 123 changes periodically. When the driving unit 117 moves downward to increase the volume, the pump chamber 123 is depressurized, and the valve body 119 is closed in close contact with the valve chamber 125. Conversely, the valve body 129 is opened and air flows from the intake hole 131. Is the pump room 123
a or 123b. Next, when the driving unit 117 moves upward to reduce the volume, the pressure in the pump chamber 123a or 123b is increased, and the valve body 129 is closed in close contact with the lid 121, while the valve body 119 is closed inward. As a result, the valve body 119 is opened and the air in the pump chamber 123a or 123b is discharged from the exhaust port 127.

[0007]

However, in a sphygmomanometer using a small pump device that performs such a pumping operation, the small pump device reduces the pressure in each pump chamber by one rotation of the motor, and increases the pressure in each pump chamber. Since the evacuation process is alternately repeated, the air pressure of the air to be exhausted fluctuates greatly, which causes a problem that the pulsation of the air when pressurizing the cuff band as a sphygmomanometer is large.

FIG. 8 shows this in detail.
(A) shows the pulsation of the exhaust gas by the air chamber 123a, and the difference between the maximum value and the minimum value of the pulse wave is defined as the magnitude of the pulsation. Similarly, FIG. 8 (b) shows the pulsation of the exhaust by the air chamber 123b, and FIG. 8 (c) shows the pulsation when the pulsation of the exhaust by the air chambers 123a and 123b is combined. One of the waveforms showing the pulsation in these figures shows the displacement of the air displacement in the process in which the compression is completed from the first time the air chamber is compressed. Thus, in the case of a pump having two air chambers, the compression stroke of the air chamber is alternately performed twice by one rotation of the motor,
Since one air chamber is exhausting and the other air chamber is inhaling air, pulsations occur alternately, and the difference between the maximum value and the minimum value indicating the magnitude of the pulsation is large.

In view of the above, in a sphygmomanometer using a pump device having a conventional structure, in order to reduce pulsation, an air reservoir for removing pulsation is separately provided,
It is necessary to complicate the path of the tube connecting the pump device and the cuff band, and the entire pump device has been increased in size.

Accordingly, an object of the present invention is to provide a sphygmomanometer with little pulsation without the necessity of adding a pulsation removing member and without complicating the path of a tube.

[0011]

In order to achieve the above-mentioned object, the present invention provides a small pump device for feeding air into a cuff band, a slow leak valve for gradually exhausting air accumulated in the cuff band, A pressure sensor for detecting the air pressure in the cuff band, a display panel for displaying the value being measured and the measurement result, a solenoid valve for quickly exhausting the air in the cuff band after the measurement is completed, and control for controlling these In a sphygmomanometer composed of a circuit, etc., the outer peripheral portion of a rotating body constituting a small pump device has a smoothly inclined convex portion, and the convex portion comes into contact with the air chamber by the rotation of the rotating body. A small pump device that performs a pumping operation by sequentially applying pressure from the intake hole side to the exhaust hole side is used.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of a sphygmomanometer according to the present invention is shown in FIGS.
Are almost the same as those shown in the conventional example. Therefore, FIG.
A small pump device used in the sphygmomanometer of the present invention will be described with reference to a sectional view of FIG.

The structure of the small pump device used for the sphygmomanometer is a motor 1, an output shaft 3, a case body 5 attached to the output shaft surface of the motor 1 with screws or the like, an inner peripheral surface of the case body 5, and a rubber. Air chamber 7a made of a flexible elastic body such as
7b, which is fixed to the output shaft 3 by press-fitting or bonding or the like, and is composed of a rotating body 9 having a convex portion 17 on the outer peripheral portion, and a lid 11. The outer peripheral surface of the case body 5 has intake holes 13a, 13a.
exhaust holes 15a and 15b are provided on the lid 11 side, and the intake holes 13a and the exhaust holes 15a and the intake holes 13b and the exhaust holes 15b have a predetermined distance in the output shaft direction. Are isolated. The exhaust holes 15a, 1
The air passing through 5b is discharged through the exhaust stack 21.

In the air chamber 7a, a plug 23a having a shape to be fitted in a concave portion of the intake hole 13a is provided in a portion closing the intake hole 13a. This is provided in each air chamber, and the air chamber 7b is provided with a stopper 23b. The air chambers 7a and 7b are connected by a communication portion 19 having sufficient rigidity.

The intake and exhaust strokes of the small pump device having such a configuration will be described with reference to the developed view of FIG. 2 and FIG. 3 showing the cross section AA of FIG. 2B.

FIGS. 2A to 2F show the positional relationship between the air chamber 7a and the convex portion 17 of the rotating body. As the rotating body rotates, the convex portion 17 moves from (a) to (f). ), And (f) shows the same state as (a), so that the rotating body has just made one rotation.

In FIG. 2 (a), the convex portion 17 is located near the intake hole 13a of the air chamber 7a, and the exhaust hole 15a side of the convex portion 17 has a sufficient space in the air chamber, so that a large amount of air is provided. Has been accumulated. When the rotating body rotates and the convex portion 17 moves to the position shown in FIG.
Since the air on the side a is compressed, it is exhausted from the exhaust hole 15a. At this time, the air chamber 7a is connected to the intake port 13a side and the exhaust port 1a.
Since it is divided by the convex portion 17 on the 5a side, air does not flow. When this is used in FIG. 3, the air chamber is divided into two parts by the protrusions 17 to the left and right, and the left air hole side air chamber 3
Reference numeral 9 denotes a state in which the air is depressurized, and a state in which the air is pressurized in the exhaust hole side air chamber 37 on the right side of the projection 17. Then, as the rotating body rotates, the space of the air chamber 39 gradually increases in the air hole side air chamber 39.

In FIG. 2C, the rotating body further rotates, and the convex portion 17 moves to the exhaust hole 15a side to exhaust air.
At this time, as shown in FIG. 1, the air chamber 7a and another air chamber 7
b is connected to the intake hole 13a side by a communication portion 19, and a convex portion 17 is provided at a position of closing the intake hole 13b of the air chamber 7b.
When the air chamber is compressed, the air chamber on the intake hole 13a side of the air chamber 7a is extended and expanded by the communication portion 19, so that air can be forced to flow. In this way, it is possible to take in air on the side of the intake hole separated from the projection while exhausting on the side of the exhaust hole. Furthermore, even if the motor rotates at a high speed, the intake and exhaust strokes can be performed regularly.

A convex plug 23b having a shape to fit in the concave portion of the intake hole is provided near the intake hole side of the air chamber, thereby preventing air from leaking from the intake hole. Therefore, good ejection performance can be obtained.

In FIG. 2D, the convex portion 17 is the exhaust hole 1
5a, and the exhaust is almost finished. At this time, sufficient air is sucked into the protrusion 17 on the suction hole side.

FIG. 2 (e) shows a state in which the rotating body is further rotated and the convex portion 17 is moved, and the exhaust hole 15a is closed by the convex portion 17. At this time, the projection 17 of the rotating body also covers the intake hole 13a on the intake hole 13a side. This allows the exhaust port 1
When the exhaust port 5a and the air chamber 7a are connected to each other and the exhaust is started, the state where the intake port 13a is always closed is ensured, so that there is no air flow between the intake port side and the exhaust port side, and no backflow occurs, so efficiency is improved. Can exhaust air well.

When the motor makes one rotation, FIG.
(F), which is the same as FIG. 2 (a).

FIG. 4 shows the pulsation of the sphygmomanometer for the small pump device of the present invention. 4 (a) shows the pulsation of the exhaust gas by the air chamber 7a, FIG. 4 (b) shows the pulsation of the exhaust gas by the air chamber 7b, and FIG. 4 (c) shows the pulsation of the exhaust gas by the air chamber 7a and the air chamber 7b. The pulsation is combined. The pulsation of the air chamber 7a and the pulsation of the air chamber 7b are shifted by a half rotation of the motor. In the present invention, although there are two air chambers, the air can be suctioned while exhausting air for each air chamber, so that the next exhaust can be performed at the same time as one exhaust is completed. During the operation, the other air chamber is also in the exhaust stroke, so the pulsation, which is the magnitude of the pulsation represented by the difference between the maximum value and the minimum value of the pulse wave, is compared with that of a conventional sphygmomanometer using a small pump device. About 40%.

Although the small pump device of the sphygmomanometer according to the present embodiment has two air chambers, the effect of reducing the pulsation can be obtained with any number of air chambers.

The configuration of the sphygmomanometer may be any other than that shown in FIGS. 5 and 6, as long as a small pump device is used. The object of the present invention can be sufficiently achieved even when an electromagnetic slow leak valve in which an electromagnetic valve for exhaust is integrated is used.

[0026]

As described above, in the sphygmomanometer according to the present invention, the small pump device used has a smoothly inclined convex portion on the outer periphery of the rotating body, and the air chamber is in contact with the air chamber. It is in contact with the convex portion, and the convex portion presses the air chamber in order from the intake hole to the exhaust hole, thereby exhausting air from the exhaust hole and sending a predetermined amount of air to the cuff of the sphygmomanometer. Thus, a sphygmomanometer with less pulsation can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a small pump device used for a sphygmomanometer of the present invention.

FIG. 2 is a development view of an air chamber and a rotating body convex portion of the small pump device used in the sphygmomanometer of the present invention.

FIG. 3 is a cross section AA in FIG. 2 (b) of the small pump device used for the sphygmomanometer of the present invention.

FIG. 4 is a diagram showing pulsation of a small pump device used in the sphygmomanometer of the present invention.

FIG. 5 is an exploded external view of the sphygmomanometer.

FIG. 6 is a configuration diagram of a sphygmomanometer.

FIG. 7 is a sectional view of a conventional small pump device.

FIG. 8 is a diagram showing pulsation of a conventional small pump device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 3 Output shaft 5 Case body 7a, 7b Air chamber 9 Rotating body 11 Lid 13a, 13b Intake hole 15a, 15b Exhaust hole 17 Convex part 19 Communication part 21 Exhaust cylinder 23a, 23b Plug part 81 Display panel 83 Cuff band 85 Slow leak valve 87 Solenoid valve 89 Pressure sensor 91 Small pump device 93 Control circuit 95 Tube

Claims (1)

[Claims] 1. A small pump device for feeding air into a cuff band, a slow leak valve for gradually exhausting air accumulated in the cuff band, a pressure sensor for detecting air pressure in the cuff band, a numerical value being measured and In a sphygmomanometer comprising a display panel for displaying a measurement result, an electromagnetic valve for rapidly exhausting air in the cuff band after the measurement is completed, and a control circuit for controlling the same, the small pump device has an outer periphery of a rotating body. A sphygmomanometer having a convex portion having a smoothly inclined portion, wherein the convex portion presses in order from the intake port side to the exhaust port side while contacting and sliding with the air chamber by rotation of the rotating body.