JP3115952B2 - Sphygmomanometer constant-speed exhaust valve device - Google Patents

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 for a sphygmomanometer to reduce the pressure at a constant speed when measuring blood pressure.

[0002]

2. Description of the Related Art In a sphygmomanometer, a cuff wound around an upper arm or the like is pressurized to a predetermined pressure by an air pump, and a blood flow is once blocked by compressing an artery, and then the pressure in the cuff is gradually reduced by a constant-speed exhaust valve device. It is configured to lower and measure systolic and diastolic blood pressure. Various types of constant-speed exhaust valve devices used in such a sphygmomanometer have been conventionally provided, and for example, those shown in FIGS. 5 and 6 have been devised by the present applicant.

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 having both ends opened, and the side surface thereof is arranged along the axial direction as shown in FIG. Is provided with a slit 2. The slit 2 is generally formed so as to penetrate in and out of the exhaust valve body 1 by making an axial cut in the exhaust valve body 1 with a sharp edge such as a cutter knife.

[0005] 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 receives pressure from the pressure adjusting screw 7 via a spring 33. Thus, it is held 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 and an air pump (both not shown) of the sphygmomanometer is provided at the bottom of the case 15.
The space formed on the inner periphery of the exhaust valve body 1 is a valve pressing body 21.
Through the vent hole 22 and the exhaust hole 27 of the pressure adjusting screw 7.

In this device, when the end face of the exhaust valve body 1 is pressed by the valve pressing body 21 by turning the pressure adjusting screw 7 to compress the spring 33, the exhaust valve body 1 The exhaust valve body 1 is sandwiched between the body 21 and the bottom surface of the case 15 and is compressed in the axial direction. 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 expanded. 6A, the slit 2 is opened as shown by the imaginary line from the state in which the slit 2 shown by the solid line in FIG. 6A is closed. Since the opening amount of the slit 2 can be adjusted by turning the pressure adjusting screw 7 to increase or decrease the pressing amount of the exhaust valve body 1, the opening amount can be adjusted to obtain a predetermined exhaust speed. Things.

[0006]

However, in the constant-speed exhaust valve device formed by providing the exhaust valve body 1 having a cylindrical shape as described above, the valve pressing body 21 is turned by turning the pressure adjusting screw 7. When adjusting the compression force applied to the exhaust valve body 1 through the opening 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 squeezing axes of both end surfaces of the exhaust valve body 1 do not coincide with each other due to variations or variations in the combination of parts, the exhaust valve body 1 is deformed abnormally, such as buckling without deforming into a via barrel shape. As a result, there is a problem that the opening amount of the slit 2 cannot be adjusted and a desired pumping speed cannot be obtained. For this reason, the assembly must be disassembled and reassembled and adjusted.

The present invention has been made in view of the above points, and has as its object to provide a constant-speed exhaust valve device for a sphygmomanometer capable of accurately adjusting an exhaust speed by reliably opening a slit. It is assumed that.

[0008]

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

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

[0010]

The pressing surface of the pressing member that presses the end surface of the exhaust valve body 1 is formed on the inclined surface 26 that is inclined so as to recede outward from the center toward the outer peripheral portion. When the end face is pressed, a stronger pressing force acts on the inner peripheral portion of the exhaust valve body 1 than on the outer peripheral portion of the exhaust valve body 1 due to the inclined surface 26, and the outer peripheral portion of the exhaust valve body 1 at the axial center portion is outward. And can be deformed into a vial barrel shape.

Further, by forming the end face of the exhaust valve body 1 on an inclined surface 3 inclined so as to recede outward from the center toward the outer peripheral portion, the exhaust valve body 1 is similarly formed on the inner peripheral surface thereof by the inclined surface 3. The part has a stronger pressing force than the outer part,
The outer peripheral portion of the exhaust valve body 1 at the axial center portion is pushed outward to be deformed into a via barrel shape. 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 periphery than at the outer periphery. Act,
The outer peripheral portion of the exhaust valve body 1 at the axial center portion is pushed outward to be deformed into a via barrel shape.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 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 having both ends opened by a flexible elastic body such as rubber, and the center of the wall surface of the exhaust valve body 1 is disposed in the axial direction (both ends opening direction). (Parallel to) with a cutter knife or the like to form a slit 2 penetrating in and out.

In FIG. 1, reference numeral 15 denotes a case serving as a main body of the constant-speed exhaust valve device. The case 15 is formed in a cylindrical shape with a bottom, and an inlet 17 for connecting a pipe 16 for introducing air from the cuff of the sphygmomanometer into the case 15 is provided on a side surface of the bottom. An internal thread 18 is formed on the inner surface of the large-diameter opening edge at the upper end of the case 15.

In FIG. 1, reference numeral 21 denotes a cylindrical valve pressing body formed by vertically penetrating a vent hole 22 in the center, and an O-ring 24 is attached to a groove 23 on the lower outer periphery. A cylindrical valve holding piece 25 having an outer diameter approximately equal to the inner diameter of the upper end of the exhaust valve body 1 protrudes from the center of the lower surface. The lower surface of the valve pressing member 21 is formed as an inclined surface 26 having a so-called top shape so as to retreat in a central portion, that is, from the base of the valve holding piece 25 to the outer peripheral portion in the outer diameter direction. The valve pressing body 21 is vertically slidably inserted into the case 15 in a state where the sealing property is secured by the O-ring 24. 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 thereto. Instead, 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. The inclined surface 26 may be provided on both the valve pressing body 21 as a member and the bottom surface of the case 15.

Further, in FIG. 1, reference numeral 7 denotes a pressure adjusting screw,
The pressure adjusting screw 7 is provided in the center with an exhaust hole 27 vertically penetrating therethrough and is formed in a cylindrical shape.
An operation groove 29 for inserting a tool for turning the pressure adjusting screw 7 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 an externally threaded portion 28 on the outer periphery to the female threaded portion 18 of the case 15. 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. A spring 33 is mounted between the pressure adjusting screw 7 and the valve pressing body 21. A pressing force is applied from the pressure adjusting screw 7 to the valve pressing body 21 via the pressure adjusting screw 7. The spring 33 is not always necessary, and may be formed in a structure in which the valve pressing body 21 is directly pressed by the pressure adjusting screw 7.

The exhaust valve body 1 is mounted in the case 15 with one end fitted to the valve holding piece 25 of the valve pressing body 21. The opening end surface at the upper end of the exhaust valve body 1 has a valve pressing body. The airtightness between the outer periphery and the inner periphery of the exhaust valve body 1 is maintained by the close contact with the lower surface of the exhaust valve body 1 and the opening end surface of the lower end of the exhaust valve body 1 in close contact with the bottom surface of the case 15.

In the constant-speed exhaust valve device formed as described above, a tool is inserted into the operation groove 29 to adjust the pressure adjusting screw 7.
, The spring 33 is compressed, and the valve pressing body 21 is displaced downward by the spring force.
With this, the exhaust valve body 1 can be pressed. When the exhaust valve body 1 is pressed in this manner, both open end faces of the exhaust valve body 1 are sandwiched 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 on the lower surface of the valve pressing body 21 is formed as an inclined surface 26, a stronger pressing force acts on the exhaust valve body 1 at the inner peripheral portion than at the outer peripheral portion of the exhaust valve body 1 by the inclined surface 26, The outer peripheral portion of the exhaust valve body 1 can be pushed outward and can be surely deformed into a via-barrel shape whose central portion in the longitudinal direction (axial direction) swells outward. 2A, the slit 2 can be reliably opened as shown by the imaginary line in FIG. 2A. The amount of this opening is adjusted by the amount of deformation of the exhaust valve body 1 in accordance with the amount of movement of the valve pressing body 21. The pump speed can be adjusted accurately.

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 high-pressure air in the cuff passes through the pipe 16 to the case 15.
Of the exhaust valve body 1 and the case 15
Flows into the air chamber 37 formed between the inner periphery of the air chamber 37 and the inner periphery of the air chamber 37. The upper surface of the air chamber 37 is provided with an O-ring 2 provided on the valve pressing body 21.
4, the sealing performance is maintained between the upper and lower end surfaces of the exhaust valve body 1 and the air chamber 37. 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 that. Accordingly, the high-pressure air reaching the air chamber 37 passes through only the opening of the slit 2 and reaches the inside of the exhaust valve body 1, and is exhausted from the vent 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 vent hole 22 and the exhaust hole 27, the pressure 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 1, and the pressure difference between the inside and the outside of the exhaust valve 1 acts as a force in the direction of closing the opening of the slit 2. The opening of the slit 2 is narrower than 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. You can do it.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment is different from the above embodiment mainly in the shape of the exhaust valve body 1, and the other basic configuration is common to the above embodiment, so that the description is omitted. In this embodiment, the exhaust valve body 1 formed in a substantially cylindrical shape having both ends opened is:
Both open end surfaces are formed as inclined surfaces 3 which recede in the outer radial direction from the inner peripheral portion to the outer peripheral portion. In the embodiment of FIG. 3, the inclined surfaces 3 are provided on both end surfaces of the exhaust valve body 1, but may be provided on at least one end surface. In addition, it is not necessary to provide the inclined surface 26 on the lower surface of the valve pressing body 21 that is in contact with the end surface of the exhaust valve body 1 or the bottom surface of the case 15 (of course, the inclined surface
6 is not obstructed), and 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 pressed between the valve pressing body 21 and the bottom surface of the case 15. Since the end face of the exhaust valve body 1 is formed as an inclined surface 3 at this time, the exhaust valve body 1 receives a stronger pressing force at its inner peripheral portion than at its outer peripheral portion due to the inclined surface 3, Exhaust valve element 1
Can be surely deformed into a via barrel shape in which the outer peripheral portion can be pushed outward and its central portion in the longitudinal direction swells outward. With this deformation, the slit 2 is formed as shown in FIG. ) Can be reliably opened as indicated by imaginary lines.

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 the other basic configuration is the same as that of the first embodiment. In this embodiment, both open end faces of the exhaust valve body 1 formed in a substantially cylindrical shape having both ends opened are provided with ribs 4 along the inner peripheral edge thereof.
Is protruding over the entire circumference. In the embodiment of FIG.
Are provided on both end faces of the exhaust valve body 1, but may be provided on at least one end face. In addition, it is not necessary to provide the inclined surface 26 on the lower surface of the valve pressing body 21 or the bottom surface of the case 15 which is in contact with the end surface of the exhaust valve element 1 (of course, it does not prevent the inclined surface 26 from being provided), and is formed on a flat surface. May be.

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. Since the ribs 4 are protruded from the inner peripheral edge of the end face of the exhaust valve body 1 at this time, the exhaust valve body 1 has a stronger pressing force at the inner peripheral portion than at the outer peripheral portion by the ribs 4. Receiving and exhaust valve 1
Can be surely deformed into a via barrel shape in which the outer peripheral portion can be pushed outward and its central portion in the longitudinal direction swells outward. With this deformation, the slit 2 is formed as shown in FIG. ) Can be reliably opened as indicated by imaginary lines.

[0023]

As described above, according to the present invention, the blood pressure is adjusted by adjusting the opening amount of the slit provided in the exhaust valve body by pressing the exhaust valve body formed in a cylindrical shape to adjust the exhaust speed. In the constant-speed exhaust valve device, the pressing surface of the pressing member that presses the end surface of the exhaust valve body is formed as an inclined surface that is inclined so as to recede outward from the center toward the outer peripheral portion. When pressing the exhaust valve body, 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 is pushed outward at the axial center portion. It can be deformed into a vial barrel shape, and even if the squeezing axis of the exhaust valve body is blurred due to part variation, etc., the exhaust valve body can be surely deformed into the vial barrel shape and the slit can be opened. , The pump speed can be adjusted accurately Than it is.

Further, since the end surface of the exhaust valve body is formed as an inclined surface which is inclined so as to recede outward from the center toward the outer peripheral portion, the exhaust valve body is similarly formed on the inner peripheral portion by the inclined surface. In this case, a stronger pressing force can be applied than in the outer peripheral portion, and the slit can be opened by reliably deforming the exhaust valve body into a via barrel shape. Furthermore, since the rib is provided on the inner peripheral edge of the end face of the exhaust valve body over the entire circumference, similarly, the rib exerts a stronger pressing force on the exhaust valve body at the inner peripheral portion than at the outer peripheral portion. Thus, the slit can be opened by reliably deforming the exhaust valve body into a via barrel shape.

[Brief description of the drawings]

FIGS. 1A and 1B show an embodiment of the present invention, in which FIG. 1A is a sectional view and FIG. 1B is a bottom view.

FIGS. 2A and 2B show an example of an exhaust valve body used in the embodiment, in which FIG. 2A is a perspective view and FIG. 2B is a sectional view.

3A and 3B show an example of an exhaust valve body used in another embodiment of the present invention, wherein FIG. 3A is a perspective view and FIG. 3B is a cross-sectional view.

FIG. 4 shows an example of an exhaust valve body used in still another embodiment of the present invention, where (a) is a perspective view and (b)
Is a sectional view.

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

6A and 6B show a conventional exhaust valve body, in which FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Exhaust valve body 2 Slit 3 Slope 4 Rib 26 Slope

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-5-269090 (JP, A) JP-A-6-47007 (JP, A) JP-A-57-131427 (JP, A) JP-A-2- 60631 (JP, A) Japanese Utility Model 1-158860 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A61B 5/02-5/0295 F16K ^7/ 00-7/20 F16K 13/00-13/10 F16K 25/00-25/04 F16K 29/00-29/02 F16K 31/06-31/11

Claims (3)

(57) [Claims] 1. A sphygmomanometer constant-speed exhaust valve device in which a cylindrical exhaust valve body is pressed to adjust an opening amount of a slit provided in the exhaust valve body to adjust an exhaust speed. A constant-pressure exhaust valve device for a sphygmomanometer, wherein a pressing surface of a pressing member that presses an end surface of an exhaust valve body is formed as an inclined surface that is inclined so as to recede outward from a central portion toward an outer peripheral portion. . 2. A constant-speed exhaust valve device for a sphygmomanometer, wherein an exhaust valve speed is adjusted by adjusting an opening amount of a slit provided in an exhaust valve element by pressing an exhaust valve element formed in a cylindrical shape. A constant-speed exhaust valve device for a sphygmomanometer, wherein an end surface of the exhaust valve body is formed on an inclined surface which is inclined so as to recede outward from a center portion toward an outer peripheral portion. 3. A constant-speed exhaust valve device for a sphygmomanometer wherein an exhaust valve speed is adjusted by pressing a cylindrical exhaust valve element to adjust an opening amount of a slit provided in the exhaust valve element. A constant-speed exhaust valve device for a sphygmomanometer, wherein a rib is provided on the inner peripheral edge of the end face of the exhaust valve body over the entire circumference.