JPH06114016A - Uniform speed exhaust valve apparatus for sphygmomanometer - Google Patents

Abstract

PURPOSE:To enable accurate adjustment of an exhaust rate by opening a slit exactly. CONSTITUTION:A uniform rate exhaust valve apparatus of a sphygmomanometer is so formed that an exhaust rate is adjusted by regulating the amount of an opening of a slit 2 provided on an exhaust valve body 1 with the pressing of the exhaust valve body 1 formed cylindrical. A pressing surface of a pressing member for pressing an end face of the exhaust valve body 1 is made as inclined surface 26 which is so inclined as to retract more outward to the outer circumference part from the center thereof. Thus, the inclined surface 26 allows the application of a pressing force to the exhaust valve body 1 stronger toward the inner circumference part than toward the outer circumference part thereby causing the slit 2 to open with accurate deformation of the exhaust valve body 1 to a shape of a barrel.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant speed exhaust valve device used in a sphygmomanometer to reduce the pressure at a constant rate when measuring blood pressure.

[0002]

2. Description of the Related Art A sphygmomanometer is designed such that an air pump pressurizes a cuff wrapped around an upper arm to a predetermined pressure, presses an artery to interrupt blood flow, and then the pressure in the cuff is gradually increased by a constant velocity exhaust valve device. It is configured to lower and measure systolic and diastolic blood pressure. Various types of constant-velocity exhaust valve devices used in such a blood pressure monitor have been conventionally provided, but the present invention has been devised, for example, as shown in FIGS. 5 and 6.

In this constant speed exhaust valve device, an exhaust valve body 1 made of a flexible elastic material such as rubber is formed in a cylindrical shape with both ends open, and its side surface is axially shown in FIG. The slit 2 is provided in the. This slit 2 is generally formed by penetrating in and out by making a notch in the axial direction in the exhaust valve body 1 with a blade having a sharp tip such as a cutter knife.

As shown in FIG. 5, the exhaust valve body 1 is disposed between the bottom surface of the case 15 and the valve pressing body 21, and the pressure received from the pressure adjusting screw 7 via the spring 33. It is sandwiched between the valve pressing body 21 and the bottom surface of the case 15. An inlet 17 for connecting a pipe 16 communicating with a cuff of a sphygmomanometer and an air pump (both not shown) is provided at the bottom of the case 15.
In addition, the space formed on the inner circumference of the exhaust valve body 1 is the valve pressing body 21.
The vent hole 22 and the exhaust hole 27 of the pressure adjusting screw 7 communicate with the atmosphere.

In this case, when the end surface of the exhaust valve body 1 is pressed by the valve pressing body 21 by rotating the pressure adjusting screw 7 and compressing the spring 33, both end surfaces of the exhaust valve body 1 press the valve. It is compressed between the body 21 and the bottom surface of the case 15 and is compressed in the axial direction, and the compression force causes the exhaust valve body 1 to have a so-called via-barrel shape in which the central portion in the axial direction is swollen. Due to the deformation, the slit 2 shown by the solid line in FIG. 6A is closed, and the slit 2 is opened as shown by the imaginary line. Since the opening amount of the slit 2 can be adjusted by rotating the pressure adjusting screw 7 to adjust the pressing amount of the exhaust valve body 1, it is possible to adjust the opening amount to obtain a predetermined exhaust speed. It is a thing.

[0006]

However, in the constant speed exhaust valve device formed by providing the exhaust valve body 1 formed in the cylindrical shape as described above, the pressure adjusting screw 7 is turned to move the valve pressing body 21. When adjusting the compression force applied to the exhaust valve body 1 via the exhaust valve body 1 and adjusting the opening amount of the slit 2 to adjust the exhaust speed, the dimensions of the case 15, the pressure adjusting screw 7, the spring 33, the valve pressing body 21, etc. If the clamping axis lines on both end surfaces of the exhaust valve body 1 do not match due to variations or combinations of components, the exhaust valve body 1 will not deform into a via barrel shape but will buckle and deform abnormally. As a result, there is a problem that the opening amount of the slit 2 cannot be adjusted and a desired exhaust speed cannot be obtained. For this reason, the assembly must be disassembled and reassembly / adjustment must be performed.

The present invention has been made in view of the above points, and an object of the present invention is to provide a constant speed exhaust valve device for a sphygmomanometer in which a slit can be reliably opened to accurately adjust the exhaust speed. It is what

[0008]

According to the present invention, the exhaust rate is adjusted by pressing the cylindrical exhaust valve body 1 to adjust the opening amount of the slit 2 provided in the exhaust valve body 1. In the constant speed exhaust valve device of the blood pressure monitor, the exhaust valve body 1
The pressing surface of the pressing member that presses the end face is formed as an inclined surface 26 that inclines so as to recede toward the outer periphery from the center.

According to the present invention, in the constant speed exhaust valve device for a sphygmomanometer as described above, the end face of the exhaust valve body 1 is formed on the inclined surface 3 which is inclined so as to recede toward the outer periphery from the center. It is characterized by consisting of. Further, the present invention is characterized in that, in the constant speed exhaust valve device for a sphygmomanometer as described above, a rib 4 is provided on the inner peripheral edge of the end face of the exhaust valve body 1 over the entire circumference.

[0010]

By forming the pressing surface of the pressing member that presses the end surface of the exhaust valve body 1 into the inclined surface 26 that recedes outward from the center toward the outer peripheral portion, the pressing member presses the exhaust valve body 1. When the end face is pressed, the inclined surface 26 exerts a stronger pressing force on the inner peripheral portion of the exhaust valve body 1 than on the outer peripheral portion thereof, and the exhaust valve body 1 has the outer peripheral portion of the axial center portion thereof outward. It can be spread out and transformed into a beer barrel shape.

Further, by forming the end face of the exhaust valve body 1 into the inclined face 3 which is inclined so as to recede toward the outer side from the central part to the outer peripheral part, the inner face of the exhaust valve body 1 is similarly formed by the inclined face 3. The part has a stronger pressing force than the outer part,
The exhaust valve body 1 can be deformed into a via barrel shape by pushing the outer peripheral portion of the central portion in the axial direction outward. Further, by providing the ribs 4 on the inner peripheral edge of the end face of the exhaust valve body 1 over the entire circumference, similarly, the ribs 4 exert a stronger pressing force on the exhaust valve body 1 at the inner peripheral portion than at the outer peripheral portion. Acting,
The exhaust valve body 1 can be deformed into a via barrel shape by pushing the outer peripheral portion of the central portion in the axial direction outward.

[0012]

The present invention will be described in detail with reference to the embodiments shown in FIGS. As shown in FIG. 2, the exhaust valve body 1 is formed in a substantially cylindrical shape with both ends opened by a flexible elastic body such as rubber. The slit 2 is formed by cutting with a cutter knife or the like and penetrating in and out.

In FIG. 1, reference numeral 15 is a case which is the main body of the constant speed exhaust valve device. The case 15 is formed in a cylindrical shape with a bottom, and an inlet port 17 for connecting a pipe 16 for introducing air from the cuff of the sphygmomanometer into the case 15 is provided on the side surface of the bottom portion. A female screw portion 18 is formed on the inner surface of the opening edge having a large diameter at the upper end of the case 15.

Further, in FIG. 1, reference numeral 21 denotes a valve pressing body formed in a cylindrical shape by providing a vent hole 22 vertically penetrating in the center, and an O-ring 24 is attached to a groove portion 23 on the lower outer periphery. At the center of the lower surface, a cylindrical valve holding piece 25 is formed, the outer diameter of which is approximately equal to the inner diameter of the upper end of the exhaust valve body 1. The lower surface of the valve pressing body 21 is formed as an inclined surface 26 having a so-called top shape so as to recede in the central portion, that is, from the root to the outer peripheral portion of the valve holding piece 25 in the outer diameter direction thereof. The valve pressing body 21 is vertically slidably inserted in the case 15 with the O-ring 24 ensuring the sealing property. In the embodiment of FIG. 1, the inclined surface 26 is provided only on the valve pressing body 21 as a pressing member that exerts a compressive force on the upper end surface of the exhaust valve body 1, but is not limited to this. Alternatively, a similar inclined surface 26 may be provided on the bottom surface of the case 15 as a pressing member that exerts a compressive force on the lower end surface of the exhaust valve body 1, and the upper and lower pressing surfaces of the exhaust valve body 1 may be pressed. The inclined surface 26 may be provided on both the valve pressing body 21 which is a member and the bottom surface of the case 15.

Further, in FIG. 1, 7 is a pressure adjusting screw,
The pressure adjusting screw 7 is formed in a cylindrical shape with an exhaust hole 27 penetrating vertically in the center, and a male screw portion 28 is formed on the outer periphery thereof.
Is provided, and an operation groove 29 into which a tool for turning the pressure adjusting screw 7 is inserted is provided on the upper surface of the pressure adjusting screw 7. The pressure adjusting screw 7 is attached to the case 15 by screwing a male screw portion 28 on the outer periphery with a female screw portion 18 of the case 15. Further, spring receiving seats 30 and 31 are provided on the lower surface of the pressure adjusting screw 7 and the upper surface of the valve pressing body 21, respectively, and a spring 33 is attached between the pressure adjusting screw 7 and the valve pressing body 21. A pressing force is applied to the valve pressing body 21 from the pressure adjusting screw 7 via the pressure adjusting screw 7. The spring 33 is not always necessary, and the spring 33 may be formed so as to directly press the valve pressing body 21 with the pressure adjusting screw 7.

The exhaust valve body 1 is mounted in the case 15 with its one end fitted to the valve holding piece 25 of the valve pressing body 21, and the opening end face at the upper end of the exhaust valve body 1 is the valve pressing body. The airtightness between the outer circumference and the inner circumference of the exhaust valve body 1 is maintained by closely contacting the lower surface of the exhaust valve body 21 and the opening end surface of the lower end of the exhaust valve body 1 closely contacting the bottom surface of the case 15.

In the constant velocity exhaust valve device formed as described above, a tool is inserted into the operation groove 29 to adjust the pressure adjusting screw 7.
When the screw is turned and screwed downward, the spring 33 is compressed and the spring force displaces the valve pressing body 21 downward, and the valve pressing body 21 is displaced downward.
Thus, the exhaust valve body 1 can be pressed. When the exhaust valve body 1 is pressed in this manner, both open end surfaces of the exhaust valve body 1 are pinched between the valve pressing body 21 and the bottom surface of the case 15 to receive a compressive force. At this time, since the pressing surface of the lower surface of the valve pressing body 21 is formed as the inclined surface 26, the inclined surface 26 exerts a stronger pressing force on the exhaust valve body 1 at the inner peripheral portion than at the outer peripheral portion, The exhaust valve body 1 can be surely deformed into a beer barrel shape in which the outer peripheral portion is expanded outwardly and the central portion in the longitudinal direction (axial direction) bulges outward, and with this deformation. The slit 2 can be surely opened as shown by an imaginary line in FIG. 2A, and the opening amount is adjusted by the deformation amount of the exhaust valve body 1 according to the movement amount of the valve pressing body 21. Therefore, the pumping speed can be accurately adjusted.

Next, the operation of the constant speed exhaust valve device according to the present invention will be described. First, when the cuff is pressurized to a predetermined pressure by an air pump (not shown), the air pump is stopped, and the high-pressure air in the cuff passes through the pipe 16 and the case 15
Of the exhaust valve body 1 and the case 15
Flows into the air chamber 37 formed between the inner circumference of the air chamber 37 and the inner periphery of the air chamber 37. The upper surface of the air chamber 37 is an O-ring 2 provided on the valve pressing body 21.
The airtightness of the exhaust valve body 1 is kept by the valve pressing body 21, and the exhaust valve body 1 is pressed against the valve pressing body 21 and the bottom surface of the case 15 by the valve pressing body 21. Being held by being. Therefore, the high-pressure air reaching the air chamber 37 reaches the inside of the exhaust valve body 1 only through the opening of the slit 2 and is exhausted from the ventilation hole 22 of the valve pressing body 21 and the exhaust hole 27 of the pressure adjusting screw 7. Since the inside of the exhaust valve body 1 communicates with the outside through the ventilation hole 22 and the exhaust hole 27, the pressure thereof is equal to the atmospheric pressure. For this reason, a pressure difference is generated between the air chamber 37 into which the high-pressure air flows and the inside of the exhaust valve body 1, and the pressure difference between the inside and outside of the exhaust valve body 1 acts as a force for closing the opening of the slit 2. The opening of the slit 2 is narrower than that in the state where no pressure is applied. As a result, when the pressure of the air reaching the air chamber 37 is high, the opening of the slit 2 becomes small and the amount of air discharged through the exhaust valve body 1 decreases, so that constant speed exhaust characteristics can be obtained. It is possible.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the shape of the exhaust valve body 1 is mainly different from that of the above-mentioned embodiment, and the other basic structure is common to the above-mentioned embodiment, and therefore the description thereof is omitted. In this embodiment, the exhaust valve body 1 formed in a substantially cylindrical shape with both ends opened is
Both opening end surfaces are formed as inclined surfaces 3 that recede in the outer radial direction from the inner peripheral portion to the outer peripheral portion. In the embodiment of FIG. 3, the inclined surface 3 is provided on both end surfaces of the exhaust valve body 1, but it may be provided on at least one end surface. Further, it is not necessary to provide the inclined surface 26 on the lower surface of the valve pressing body 21 that contacts the end surface of the exhaust valve body 1 or the bottom surface of the case 15 (of course, the inclined surface 2
It does not prevent provision of 6), but may be formed on a flat surface.

Also in this embodiment, when the exhaust valve body 1 is pressed by the valve pressing body 21, both open end faces of the exhaust valve body 1 are pinched between the valve pressing body 21 and the bottom surface of the case 15. When the exhaust valve body 1 receives a compressive force and the end surface of the exhaust valve body 1 is formed as an inclined surface 3 at this time, the inner peripheral portion of the exhaust valve body 1 receives a stronger pressing force than the outer peripheral portion due to the inclined surface 3, Exhaust valve body 1
Can be surely deformed into a via-barrel shape in which the outer peripheral portion is pushed outward and the central portion in the longitudinal direction bulges outward. With this deformation, the slit 2 is formed as shown in FIG. ) Can be surely opened as shown by the imaginary line.

Next, a third embodiment of the present invention will be described with reference to FIG. This embodiment is also different from the first embodiment mainly in the shape of the exhaust valve body 1, and since the other basic configuration is common to the first embodiment, the description thereof will be omitted. In this embodiment, on both open end faces of the exhaust valve body 1 formed in a substantially cylindrical shape with both ends open, ribs 4 are provided along the inner peripheral edge thereof.
Is projected all over the circumference. Rib 4 in the embodiment of FIG.
Is provided on both end faces of the exhaust valve body 1, but it may be provided on at least one end face. Further, it is not necessary to provide the inclined surface 26 on the lower surface of the valve pressing body 21 and the bottom surface of the case 15 which are in contact with the end surface of the exhaust valve body 1 (of course, it does not prevent the inclined surface 26 from being provided), and the inclined surface 26 is formed on a flat surface. You can

Also in this embodiment, when the exhaust valve body 1 is pressed by the valve pressing body 21, both open end faces of the exhaust valve body 1 are pinched between the valve pressing body 21 and the bottom surface of the case 15. The exhaust valve body 1 receives a compressive force, and at this time, the ribs 4 project from the inner peripheral edge of the end face of the exhaust valve body 1, so that the inner peripheral portion of the exhaust valve body 1 exerts a stronger pressing force than the outer peripheral portion by the ribs 4. Receiving and exhaust valve body 1
The outer peripheral portion can be expanded outwardly, and the central portion in the longitudinal direction can be surely deformed into a via-barrel shape that bulges outward. With this deformation, the slit 2 can be formed as shown in FIG. ) Can be surely opened as shown by the imaginary line.

[0023]

As described above, according to the present invention, by pressing the exhaust valve body formed in a cylindrical shape, the opening amount of the slit provided in the exhaust valve body is adjusted to adjust the exhaust speed. In the constant-speed exhaust valve device of the meter, since the pressing surface of the pressing member that presses the end surface of the exhaust valve body is formed as an inclined surface that recedes outward from the center toward the outer periphery, the end surface of the exhaust valve body When pressing, the inner peripheral portion of the exhaust valve body exerts a stronger pressing force than the outer peripheral portion due to the inclined surface, and the outer peripheral portion of the exhaust valve body in the axial center portion is spread outward. It can be deformed into a via barrel shape, and even if the pinching axis of the exhaust valve body is displaced due to component variations etc., the exhaust valve body can be reliably transformed into a via barrel shape and the slit can be opened. , Exhaust speed can be adjusted accurately Than it is.

Further, since the end surface of the exhaust valve body is formed to be an inclined surface which is inclined so as to recede toward the outer side from the central portion toward the outer peripheral portion, the inclined surface similarly forms the inner peripheral portion of the exhaust valve body. In this case, a stronger pressing force can be applied than the outer peripheral portion, and the exhaust valve body can be surely deformed into a via barrel shape to open the slit. Further, since ribs are provided on the inner peripheral edge portion of the end face of the exhaust valve body over the entire circumference, similarly, the ribs exert a stronger pressing force on the exhaust valve body at the inner peripheral portion than at the outer peripheral portion. Thus, the exhaust valve element can be surely deformed into a via barrel shape to open the slit.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, in which (a) is a sectional view and (b) is a bottom view.

2A and 2B show an example of an exhaust valve element used in the above-mentioned embodiment, wherein FIG. 2A is a perspective view and FIG. 2B is a sectional view.

FIG. 3 shows an example of an exhaust valve body used in another embodiment of the present invention, (a) is a perspective view and (b) is a sectional view.

4A and 4B show an example of an exhaust valve body used in still another embodiment of the present invention, FIG. 4A being a perspective view and FIG.
Is a sectional view.

FIG. 5 shows a conventional example, (a) is a sectional view,
(B) is a bottom view.

6A and 6B show an exhaust valve body of a conventional example, in which FIG. 6A is a perspective view and FIG. 6B is a sectional view.

[Explanation of symbols]

 1 Exhaust valve body 2 Slit 3 Sloping surface 4 Rib 26 Sloping surface

Claims (3)

[Claims] 1. A constant-speed exhaust valve device for a blood pressure monitor, wherein an exhaust valve body formed in a cylindrical shape is pressed to adjust an opening amount of a slit provided in the exhaust valve body to adjust an exhaust speed. A constant-speed exhaust valve device for a blood pressure monitor, characterized in that the pressing surface of the pressing member for pressing the end surface of the exhaust valve body is formed into an inclined surface that inclines so as to recede outward from the center toward the outer peripheral portion. . 2. A constant speed exhaust valve device for a blood pressure monitor, wherein an exhaust valve body formed in a cylindrical shape is pressed to adjust an opening amount of a slit provided in the exhaust valve body to adjust an exhaust speed. A constant-speed exhaust valve device for a sphygmomanometer, characterized in that the end surface of the exhaust valve body is formed into an inclined surface that is inclined so as to recede toward the outer side from the central part toward the outer peripheral part. 3. A constant speed exhaust valve device for a sphygmomanometer, wherein an exhaust valve body formed in a tubular shape is pressed to adjust an opening amount of a slit provided in the exhaust valve body to adjust an exhaust speed. A constant-speed exhaust valve device for a sphygmomanometer, characterized in that ribs are provided on the inner peripheral edge of the end face of the exhaust valve body over the entire circumference.