JPH07229574A - Exhaust device for hemodynamometer - Google Patents

Abstract

PURPOSE:To provide an exhaust device for a hemodynamometer by which a favorable constant rate exhaust property can be obtained even when a size in a device is reduced. CONSTITUTION:A constant rate exhaust valve 15 is constructed of a valve main body 31 consisting of an elastic body such as rubber and a flow rate regulating body 32 consisting of a rod body having a circular cross section. The valve main body 31 is provided with a cylindrical part 33, which is arranged in one end side in the axial direction and is provided with an opening connected with the air side, and a flat part 35, which is arranged in the other end side in the axial direction, is arranged on the air flow passage side, and is provided with a slit 34 closed in a normal condition. The flow rate regulating body 32 consists of phosphor bronze having a spring characteristic, and is provided with a spiral part 39 wound for several times in the same diameter as the inner circumference diameter of the cylindrical part 33 and an insertion part 40, which is projected upward from one end of the spiral part 39 and is inserted into the slit 34.The insertion part 40 is positioned in the center of the spiral circle of the spiral part 40 and is formed into a straight line.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust device for a blood pressure monitor, and more particularly to an improved technique for a constant speed exhaust valve of this type of exhaust device.

[0002]

2. Description of the Related Art Blood pressure is usually measured by pressurizing a measurement site with a cuff, gradually reducing the air pressure in the cuff, and capturing the Korotkoff sound generated in the process of decreasing the air pressure. In such blood pressure measurement, it is necessary to reduce the air pressure in the cuff at a constant speed, and various exhaust devices have been provided. FIG. 8 shows an example of a constant speed exhaust valve of an exhaust device used in this type of sphygmomanometer disclosed in JP-A-3-131225.

The constant velocity exhaust valve shown in FIG. 1 has a hollow cylindrical valve body 1 made of an elastic material such as rubber, and a plate-like flow rate adjusting body 2 provided in the valve body 1. The main body 1 is composed of an annular portion 1a and a flat portion 1b continuous with the annular portion 1a. The main body 1 is provided on one end side in the axial direction and is connected to the atmosphere side, and an opening 1c is provided on the other end side in the axial direction. And a slit 1d that closes in a steady state.

The flow rate adjusting body 2 is formed in a substantially T-shape, and has a wide blade portion 2a provided at one end side and a tip portion 2b twisted by approximately 90 ° with respect to the blade portion 2a. And wing 2
The tip 2b is inserted into the slit 1d so that a is locked in the groove 1e provided in the annular portion 1a. A twisting returning force for restoring the original flat plate always acts on the tip portion 2b.

However, such a conventional constant speed exhaust valve has the technical problems described below.

[0006]

That is, although downsizing has recently been promoted in blood pressure monitors, in the constant velocity exhaust valve shown in FIG. 8, the plate-like flow rate adjusting body 2 is twisted to form the main body. Part 1
Since it is a configuration to be mounted on the control body 2, if the mounting is troublesome and the overall size is reduced, the rigidity of the adjusting body 2 increases, and the mounting becomes very difficult, which is a great obstacle to miniaturization.

Further, the plate-shaped flow rate adjusting body 2 has a spring constant which is too large for the valve body 1 made of an elastic body such as rubber, and when the flow rate adjusting body 2 is twisted, elastic strain to the slit 1d is generated. It is difficult to be uniform on both end sides of 2, and if the dimensional shape of the adjusting body 2 varies, this tendency becomes more remarkable. As a means for solving such a problem, for example, a configuration in which the plate-shaped flow rate adjusting body 2 is changed to a round bar shape having a circular cross section and is inserted into the slit 1d without twisting is conceivable. When the body is adopted, it is easy to wear and meets the demand for miniaturization.

However, even if a round rod-shaped flow rate adjusting body having a circular cross section is adopted, there are the following problems. FIG. 9 is a drawing for explaining a defect in the case where a round rod-shaped flow rate adjusting body having a circular cross section is adopted, and FIG. 9 shows a cross section of the slit 1d and the round bar shaped flow rate adjusting body 3. . Now for example,
When the total length of the slit 1d is l, the center of the flow rate control body 3 is located at 1 / 2l of the slit 1d (Fig. 9).
In (A), the elastic strains on both ends of the flow rate adjusting body 3 become uniform, and the pressure applied to the outer circumference of the valve body 1 from the cuff side changes the gap formed on the outer circumference of the flow rate adjusting body 3. Then, exhaust is performed at a constant speed.

However, as shown in FIG. 9 (B), when the center of the flow rate adjusting body 3 is displaced from the midpoint of the slit 1d to one side, elastic strain on both ends of the flow rate adjusting body 3 is not sufficient. Be uniform. When the flow rate adjuster 3 is attached to the slit 1d in such a state, the size of the gap formed on the outer periphery of the flow rate adjuster 3 is different between the left and right, and at a constant speed corresponding to the pressure on the cuff side. Exhaust is not performed, and as a result, the linearity of the exhaust characteristic of the constant speed exhaust valve deteriorates.

That is, even if a rod-shaped member having a circular cross section is used as the flow rate adjusting member, if the rod-shaped member is not accurately positioned at the center of the slit 1d, the inconvenience as described above occurs, and such a problem is caused by the length of the slit 1d. When the value is large to some extent, the positional deviation of the flow rate adjusting body 3 can be absorbed, but if the valve is downsized, the effect cannot be expected, which is a very serious problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an exhaust device for a sphygmomanometer capable of constant-speed exhaust even if it is downsized. .

[0012]

In order to achieve the above object, the first invention is a cuff for pressurizing a blood pressure measurement site, a constant speed exhaust valve for discharging air in the cuff at a constant speed, and the cuff. In a sphygmomanometer exhaust device including an air flow passage communicating with a constant speed exhaust valve, the constant speed exhaust valve is provided in a hollow cylindrical valve body made of an elastic body, and provided in the valve body. A valve body having a circular cross-section rod-shaped body, wherein the valve body is provided on one end side in the axial direction and has a cylindrical portion having an opening communicating with the atmosphere side and the other end side in the axial direction. A flat portion having a slit which is provided on the cuff side or the air circulation passage side and is closed in a steady state, and the flow rate adjusting body is a spiral portion having a diameter substantially the same as the inner peripheral diameter of the cylindrical portion, An insertion portion that protrudes upward from one end of this spiral portion and is inserted into the slit. Characterized in that it has.

According to the first aspect of the present invention, the insertion portion can be formed in a straight line at the center of the spiral portion. Further, in the first invention, the insertion portion may be formed in a substantially U shape on one end side of the spiral portion, and an outer side surface thereof may be pressed against the edge of the slit. Furthermore, the second invention is a cuff for pressurizing a blood pressure measurement site, a constant speed exhaust valve for discharging the air in the cuff at a constant speed, and an air flow passage communicating between the cuff and the constant speed exhaust valve. In the sphygmomanometer exhaust device, the constant-speed exhaust valve has a hollow cylindrical valve body made of an elastic body and a flow rate control body made of a rod-shaped body having a circular cross section, and the valve body is a shaft. A cylindrical portion having an opening communicating with the atmosphere side provided on one end side in the direction, and a slit provided on the other end side in the axial direction on the cuff side or the air circulation passage side and closed in a steady state And a flat portion, and the flow control body has an overall shape of substantially U-shape, V-shape,
It is selected from those bent and formed in a W shape, and both end sides are elastically locked to the end edges of the slit.

[0014]

According to the sphygmomanometer exhaust device of the first aspect of the present invention having the above-mentioned structure, the flow rate adjusting body includes a spiral portion having a diameter substantially the same as the inner peripheral diameter of the cylindrical portion of the valve body, and upward from one end of the spiral portion. Protruding into
Since the insertion part is inserted into the slit of the valve body, when the spiral part is inserted into the cylindrical part, the insertion part is inserted into the slit while being positioned.

Further, according to the structure of claim 2, since the insertion portion is located at the center of the spiral portion and is formed in a straight line, when the spiral portion is inserted into the cylindrical portion, the insertion portion is slit. It can be inserted while being positioned at the center of the.
Further, according to the structure of claim 3, since the insertion portion is formed in a substantially U shape on one end side of the spiral portion, and the outer surface thereof is pressed against the end edge of the slit, the spiral portion is formed. When is inserted into the cylindrical portion, the insertion portion can be inserted while being positioned at the edge of the slit.

On the other hand, according to the blood pressure monitor exhaust device of the second aspect of the present invention, the flow rate adjuster has a generally U-shaped, V-shaped overall shape.
It is composed of a rod-shaped body having a circular cross section that is bent and formed into a letter W shape, and the valve body is provided on one end side in the axial direction and has a cylindrical portion having an opening communicating with the atmosphere side and the other end side in the axial direction. There is a flat portion having a slit that is provided on the cuff side or the air circulation passage side and closes in a steady state, and the flow rate adjusting body is elastically locked at both ends on the edges of the slit. Therefore, the insertion position is positioned at the edge of the slit, and a uniform gap is formed between the flow rate adjusting body and the slit only on one side of the adjusting body.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. 1 to 3 show a first embodiment of a blood pressure monitor exhaust device according to the present invention. FIG. 1 is an exploded perspective view of a sphygmomanometer using the exhaust device of the present invention. The sphygmomanometer is, for example, an upper case 1 formed in a cup shape with hard vinyl chloride, and the upper case 1 is fitted and fixed. For example, the lower case 2 integrally formed in a substantially concave shape with ABS resin.

The upper and lower cases 1 and 2 are formed in a substantially rectangular shape, and the upper case 1 has various operation buttons 3 and
A transparent plate 4 on which the liquid crystal display unit is mounted from the lower surface side is provided. The lower case 2 defines a battery storage box 5 that serves as a power source for the blood pressure monitor, and a battery lid 6 is fitted into the box 5. In addition, in the upper and lower cases 1 and 2, a board 7 on which electrical control system components of the sphygmomanometer are mounted and an air control system component 8 are housed.

A plurality of contact switches 9 are provided on the board 7 in correspondence with the operation buttons 3 provided on the upper case 1.
Is attached, and a power socket 10 and a liquid crystal display panel 11 are provided. The air control system component 8 includes a pump unit 12, a solenoid valve 13, and an air socket 14.
And a constant speed exhaust valve 15. These respective parts are connected to each other by an air tube 16, and the air tube 16 is a part of an air circulation passage.

The pump unit 12 is driven and controlled by the operation of the electric control system components mounted on the board 7, and sends out compressed air to the air tube 16. The solenoid valve 13 is also an open / close valve that is drive-controlled by the operation of electric control system components, and has a function of a quick exhaust valve that exhausts the air in the air tube 16 by opening the valve. The air socket 14 is connected to one end of an air tube 16, is fitted into a socket receiver 17 provided on the outer peripheral edge of the lower case 2, and has a branch tube 18 provided at one end thereof.
It is connected to the pressure sensor unit 19 attached to the substrate 7 via. In addition, the air socket 14
One end of the connecting tube 20 is connected, and the other end of the connecting tube 20 is connected to the air bag 22 inside the cuff 21.

The air tube 16 and the connecting tube 20 form an air circulation path 25 for supplying and exhausting air between the cuff 21 and the air control system component 8. Cuff 2 of this embodiment
The reference numeral 1 is wrapped around the upper arm of the blood pressure measurer, and has a sealed air bag 22 built therein and a magic fastener or the like. The member designated by the reference numeral 23 in FIG. 1 is a printer unit that prints the measurement results.

The mounting structure of the constant speed exhaust valve 15 is shown in FIG. The constant velocity exhaust valve 15 shown in the figure is mounted and supported by the valve holder 24. The valve holder 24 is integrally insert-molded into an outer cylinder portion 26 of synthetic resin whose both ends are open and whose lower end is connected to the air tube 16 and an upper end side opening portion of the outer cylinder portion 26, and is formed on the inner peripheral surface. It is composed of a hollow cylindrical nut 27 in which a screw is engraved, and an inner cylindrical portion 28 in which a screw screwed to the nut 27 is engraved on the outer periphery.

A concave groove 29 is provided around the front end of the inner cylindrical portion 28, and an O-ring 30 provided in the concave groove 29 is provided on the inner peripheral surface of the outer cylindrical portion 26 and the outer peripheral surface of the inner cylindrical portion 28. The screwing portion between the inner tubular portion 28 and the nut 27 is hermetically sealed by sandwiching between the inner tubular portion 28 and the nut 27. On the other hand, the constant speed exhaust valve 15 includes a valve body 31 made of an elastic body such as rubber and a flow rate adjusting body 32 made of a rod-shaped body having a circular cross section.

As shown in detail in FIG. 3, the valve body 31 is provided on one end side in the axial direction and has a cylindrical portion 33 having an opening communicating with the atmosphere side, and on the other end side in the axial direction, The slit 3 provided on the air circulation passage 25 (specifically, communicating with the air tube 16) side and closed in a steady state
4 and a flat portion 35 having The valve body 31 is
A flange portion 36 is provided at the upper end of the cylindrical portion 33, and the valve body 31 applies an adhesive to the outer peripheral surface of the cylindrical portion 33 and the outer peripheral surface of the flange portion 36 to form the inner cylindrical portion 2 of the valve holder 24.
It is fixed to the through-hole 37 and the step portion 38 provided at the center of 8.

The flow rate adjusting body 32 is made of, for example, phosphor bronze having a spring property, and has a spiral portion 39 wound a plurality of times with a diameter substantially equal to the inner peripheral diameter of the cylindrical portion 33, and the spiral portion. It has an insertion portion 40 that protrudes upward from one end of 39 and is inserted into the slit 34. The insertion portion 40 is located at the center of the spiral circle of the spiral portion 40 in this embodiment,
It is formed in a straight line. In FIG. 2, reference numeral 41
The member indicated by is a cover fixed to the open end on the atmosphere side of the valve body 31 of the constant speed exhaust valve 15, and a through hole communicating with the inside of the cylindrical portion 33 of the valve body 31 is provided in the center thereof. ing.

In the sphygmomanometer configured as described above, when the pump unit 12 is driven to send compressed air into the air bag 22 inside the cuff 21, the measured portion around which the cuff 21 is wound is determined. The pressure value can be increased. When the pressurization of the cuff 21 is stopped, the constant speed exhaust valve 15 of the exhaust device operates. The operation of the constant velocity exhaust valve 15 at this time is such that when the pressure on the cuff 21 side is high, the air flow passage 25
Since the internal pressure is also high, the gap formed in the peripheral edge of the insertion portion 40 is reduced by this pressure, and the exhaust is performed at high speed from the reduced gap.

On the other hand, when the exhaust progresses and the pressure in the air circulation passage 25 gradually decreases, the gap formed at the peripheral edge of the insertion portion 40 expands accordingly, and the exhaust speed decreases, resulting in The pressure in the cuff 21 drops at a constant speed. At this time, in the exhaust device of the present embodiment, the flow rate adjusting body 32 has the spiral portion 3 having the same diameter as the inner peripheral diameter of the cylindrical portion 33 of the valve body 31.
9 and an insertion portion 40 protruding upward from one end of the spiral portion 39 and inserted into the slit 34 of the valve body 31. The insertion portion 40 has a circular cross section and is linearly formed. Since it is located at the center of the spiral portion 39, when the spiral portion 39 is inserted into the cylindrical portion 33, the insertion portion 4
It is inserted in the center of the slit 34 with 0 positioned.

Therefore, the gaps formed on both sides of the insertion portion 40 are made uniform, and the linearity of the exhaust characteristic of the constant velocity exhaust valve 15 is maintained well, and this linearity is constant.
Even if the valve body 31 of No. 5 is downsized, it is not damaged.
Further, the constant velocity exhaust valve 15 of the present embodiment is held by the inner cylinder portion 28 of the valve holder 24, and the inner cylinder portion 28 and the nut 27 provided on the outer cylinder portion 26 are screwed together to form the inside and outside. Tube 2
Since the O-ring 30 is interposed between 6 and 28,
The installation position of the constant speed exhaust valve 15 can be adjusted, and the constant speed exhaust valve 15 can be easily attached and detached.

Therefore, for example, when a defect is found in the constant speed exhaust valve 31, the inspection and replacement can be easily performed. FIG. 4 shows a second embodiment of the present invention, and only the characteristic points will be described below. The constant velocity exhaust valve 15 shown in the figure is the same as that of the above embodiment, but the valve holder 24a has a very simple structure. The valve holder 24a is composed of a hollow cylindrical body whose both ends are open. The air tube 16 is connected to one end of the valve holder 24a, and the valve body 31 of the constant velocity exhaust valve 15 is adhesively fixed therein. The cover 41 is provided on the other end of the valve holder 24a.
Is installed.

With the constant velocity exhaust valve 15 thus constructed, the same function and effect as in the above embodiment can be obtained, and according to the structure of the valve holder 24a of this embodiment, the air flow passage 25 and the atmosphere can be separated from each other. There is an advantage that the seal structure between them becomes simple. FIG. 5 shows a third embodiment of the present invention, and only the characteristic points will be described below. Figure 5
FIG. 6 is a detailed view of a modified example of the constant speed exhaust valve 15b. The constant speed exhaust valve 15b has the same valve body 31, cylindrical portion 33, slit 34, and flattened portion as those shown in the first embodiment. Three
5, it has the flange portion 36, but the flow rate adjusting body 32b
Is configured as follows.

The flow rate adjusting body 32b is made of a material similar to that of the first embodiment, and has a spiral portion 39b wound a plurality of times to have a diameter substantially the same as the inner peripheral diameter of the cylindrical portion 33, and this spiral portion. It has an insertion portion 40b that protrudes upward from one end of 39b and is inserted into the slit 34. The insertion portion 40b is
The spiral portion 39b is bent and formed into a substantially U shape having a width substantially equal to the diameter of the spiral portion 39b, and both outer side surfaces thereof are pressed against the end edges of the slit 34.

According to the constant velocity exhaust valve 15b thus configured, the insertion position of the insertion portion 40b is positioned at the end edge of the slit 34, and the inner surfaces facing each other are provided between the insertion portion 40b and the slit 34. A uniform gap is formed only on the side, and the same effect as that of the first embodiment can be obtained. Figure 6
Shows a fourth embodiment of the present invention, and only the characteristic points will be described below. FIG. 6 is a detailed view of a modified example of the constant speed exhaust valve 15c. The constant speed exhaust valve 15c has the same valve body 31 and cylindrical portion 3 as those shown in the first embodiment.
3, the slit 34, the flat portion 35, and the flange portion 36 are included, but the flow rate adjusting body 32c is configured as follows.

The flow rate adjusting body 32c is made of a material similar to that of the first and third embodiments, is bent and formed in a substantially U shape with an interval slightly larger than the width of the slit 34, and both end sides of the slit 34 are formed. It is locked so as to spring to the edge.
According to the constant velocity exhaust valve 15b configured as described above, the flow rate adjusting body 32c and the slit 34, which are rod-shaped bodies having a circular cross section, are provided.
A uniform gap is formed only between the insertion portion 40c and the insertion portion 40c, and the same effect as the third embodiment is obtained, and the adjusting body 32c bends the rod-shaped body into a substantially U-shape. Because it is only, the processing becomes very easy.

The adjustment body 32c is mounted by inserting the end portion into the slit 34 so that the width of the end portion bent in a U shape is slightly narrower than the width of the slit 34. It can be mounted in place, which makes assembly very easy. In the third and fourth embodiments described above, the bent shape of the flow rate adjusting body is not limited to the U shape, and the same operational effect can be obtained even if the flow adjusting body has a V shape or a W shape, for example.

FIG. 7 shows a fourth embodiment of the present invention, and only the characteristic points will be described below. In the embodiment shown in the figure, the constant velocity exhaust valve 1 is also provided in the air bag 22 of the cuff 21.
5 is provided. The constant speed exhaust valve 15d is selected from those shown in the above-mentioned embodiments and may have the same configuration or a combination of different configurations. In the embodiment configured as described above, since the exhaust is performed by the plurality of constant speed exhaust valves, a preferable result can be obtained even if the capacity of the air bag 22 of the cuff 21 is large.

[0036]

As described above in detail in the embodiments,
According to the sphygmomanometer exhaust device of the present invention, good constant-velocity exhaust characteristics can be obtained even if the device is downsized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a sphygmomanometer in which an exhaust device according to the present invention is used.

FIG. 2 is an enlarged cross-sectional view of the exhaust device of FIG.

FIG. 3 is a plan view and a side view of a constant speed exhaust valve of the exhaust device shown in FIG.

FIG. 4 is a cross-sectional view showing a second embodiment of the exhaust device according to the present invention.

5A and 5B are a plan view and a side view of a constant speed exhaust valve showing a third embodiment of the exhaust system of the present invention.

6A and 6B are a plan view and a side view of a constant velocity exhaust valve showing a fourth embodiment of the exhaust system of the present invention.

FIG. 7 is an explanatory view showing a fifth embodiment of the exhaust device according to the present invention.

FIG. 8 is a perspective view of a constant speed exhaust valve of a conventional exhaust device.

FIG. 9 is an explanatory diagram showing a defect of a constant speed exhaust valve of a conventional exhaust device.

[Explanation of symbols]

 15, 15b, 15c Constant velocity exhaust valve 16 Air tube 21 Cuff 25 Air flow passage 31 Valve body 32, 32b, 32c Flow rate adjuster 33 Cylindrical part 34 Slit 35 Flat part 39, 39b Spiral part 40, 40b Insertion part

Claims (4)

[Claims] 1. A cuff for pressurizing a blood pressure measurement site, a constant speed exhaust valve for discharging air in the cuff at a constant speed, and an air flow passage communicating between the cuff and the constant speed exhaust valve. In the exhaust device for a sphygmomanometer, the constant-speed exhaust valve has a hollow cylindrical valve body made of an elastic body, and a flow rate control body made of a rod-shaped body having a circular cross section provided in the valve body, The valve main body is provided at one end side in the axial direction and has a cylindrical portion having an opening communicating with the atmosphere side, and the other end side in the axial direction is provided at the cuff side or the air circulation passage side, and in a steady state. A flat portion having a slit for closing, wherein the flow rate adjuster has a spiral portion having substantially the same diameter as the inner diameter of the cylindrical portion, and protrudes upward from one end of the spiral portion and is inserted into the slit. An exhaust device for a sphygmomanometer, comprising: an insertion portion. 2. The exhaust device for a sphygmomanometer according to claim 1, wherein the insertion portion is located at the center of the spiral portion and is linearly formed. 3. The insertion portion is formed in a substantially U shape on one end side of the spiral portion, and an outer side surface of the insertion portion is pressed against an edge of the slit. Exhaust device for blood pressure monitor. 4. A cuff for pressurizing a blood pressure measurement site, a constant velocity exhaust valve for discharging air in the cuff at a constant velocity, and an air flow passage communicating between the cuff and the constant velocity exhaust valve. In the exhaust device for a sphygmomanometer, the constant-velocity exhaust valve has a hollow cylindrical valve body made of an elastic body and a flow rate control body made of a rod-shaped body having a circular cross section, and the valve body has an axial direction. A cylindrical portion provided at one end side and having an opening communicating with the atmosphere side, and a flat portion provided at the other end side in the axial direction on the cuff side or the air circulation passage side and having a slit that closes in a steady state The flow rate adjusting body is selected from those in which the entire shape is bent and formed into a substantially U shape, a V shape, and a W shape, and both ends are elastically locked to the edges of the slit. Exhaust device for sphygmomanometer characterized by.