JPH0224532B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a gradual exhaust mechanism for a sphygmomanometer that maintains a substantially constant rate of decrease in exhaust pressure during gradual exhaust action during blood pressure measurement. (Background technology) Generally, when measuring blood pressure, pressurized air (the pressure value varies depending on the person being measured, but usually 80 to 260 mmHg) is sent to the cuff band wrapped around the arm, and this pressure is gradually increased. The highest and lowest blood pressure values are measured while lowering the blood pressure. In this case, the pressure drop rate is usually set to 2 to 3 mmHg/sec from the viewpoint of preventing blood congestion in the subject's arm and eliminating measurement errors in the diastolic blood pressure value.
This value is used as the optimal descent speed with the least measurement error. However, the optimal descent speed can be achieved relatively easily when the air pressure within the cuff band is high;
The pressure tends to decrease as the pressure in the cuff band decreases, that is, it is difficult to keep the rate of pressure drop constant, which has the drawback of causing errors in measuring blood pressure values. (Object of the Invention) The present invention has been proposed in view of the above points, and its purpose is to obtain a substantially constant pressure drop rate in the gradual evacuation action regardless of pressure changes in the air within the cuff band. An object of the present invention is to provide a gradual exhaust mechanism for a blood pressure monitor having a valve body adapted to be used. (Disclosure of the Invention) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Figure 1 shows the overall configuration of the blood pressure monitor, where 1 is the blood pressure monitor body with a pressure gauge inside, 2 is the cuff band,
Reference numeral 3 denotes an air supply device equipped with a gradual exhaust mechanism according to the present invention, 4 a pressurizing ball, and 4a a check valve. are connected to each other. FIG. 2 shows an embodiment of the present invention, and specifically shows the structure of an air supply device 3 equipped with a gradual exhaust mechanism.
and a substantially cylindrical tail tube 3b coaxially connected to the base tube 3a. The tail piece 3b is used to connect the air supply device 3 to the pressure ball 4, and a check ring 6 for preventing the pressure ball 4 from coming off is protruded around the transition piece 3b. A filter 7, such as a metal mesh or sponge rubber, is disposed at the opening edge of the tail piece 3b to remove dust from the air sent from the pressure ball 4. Further, extremely small exhaust holes 9 are gradually bored in a part of the peripheral wall of the transition tube 3b close to the base tube 3a. As shown in detail in FIG. 3, at the connecting portion between the base tube 3a and the transition tube 3b, a valve support 10 having a cylindrical portion 10a and a flange 10b constituting a gradual exhaust mechanism is attached to the cylindrical portion 10a. In the direction of the tail tube 3b,
Further, the flange 10b is arranged so as to face into the base cylinder 3a. A pair of rubber bodies 11a and 11b made of an elastic material such as rubber are sandwiched and disposed between the flange 10b of the valve support 10 and the bottom plate 3d of the base cylinder 3a.
The rubber bodies 11a, 11b are ring-shaped and have through holes 11a', 11b' passing through the cylindrical portion 10a of the valve support 10, and the through holes 11a', 11b' of the rubber bodies 11a, 11b are formed in the valve support 10. 10 cylindrical parts 10
As shown in FIG. 4, a plurality of protrusions 10c are provided along the axial direction on the outer peripheral surface of the cylindrical portion 10a, for example, through holes 11a', 11b'. The valve support 10 is positioned by bringing it into contact with the circumferential wall of the tail tube 3b and close to the inside of the circumferential wall of the transition piece 3b.
A ventilation gap 12 is formed by the peripheral walls of a' and 11b'. Therefore, in the present invention, a wire line W is provided between a pair of rubber bodies 11a and 11b arranged on the valve support 10, and this wire line W is formed in an L-shape. The main feature is that it is made of a material such as a rubber tube and is supported by a cylindrical wire stopper S. In the wire stopper S, a minute slit T extending in the axial direction from one end corresponding to the flange 10b side to the other end is cut into the upper and lower parts of the peripheral wall of the wire stopper S using a cutting blade such as a cutter. The wire wire W is supported by pushing the base portion of the L-shaped wire wire W into the slit T, that is, the vicinity of the bent portion. When inserting and arranging the wire wire W supported in this way between the rubber bodies 11a and 11b, first, the rubber body 11a is arranged around the cylindrical portion 10a on the flange 10b side of the valve support 10, and then The wire stopper S, on which the wire wire W is provided in advance as described above, is inserted into the cylindrical portion 10a. In this case, the cylindrical part 10
Since a slit T' is formed in a to guide one end Wa of the wire wire W and expose it to the outside, a wire stopper S is formed in the cylindrical portion 10a.
When the wire wire W is inserted and placed, one end Wa of the wire wire W protrudes outside, and then the rubber body 11b is inserted into the cylindrical portion 10a.
By inserting it into the outer periphery, one end Wa of the wire wire W can be easily held and fixed in a sandwich-like manner by the rubber body 11a and the rubber body 11b. According to the above structure, even if the rubber bodies 11a and 11b provided on the cylindrical portion 10a separate due to clumsiness during assembly, the wire wire W provided on the wire stopper S inserted into the cylindrical portion 10a
Since the rubber body 11a and the rubber body 11b also move in parallel, the rubber body 11a, one end Wa of the wire wire W, and the rubber body 11b can be easily assembled so as to be connected to each other. Further, the wire wire W is provided on a wire stopper S, and the wire stopper S is inserted into the cylindrical portion 10a, so that the wire wire W can be easily inserted. Also, if the slit T' is formed narrowly, the wire wire W
There is no angular deviation, and since the wire wire W has an L-shape rather than a simple rod-like shape, it will not be twisted during installation. Note that the rubber bodies 11a used in this example,
As shown in FIG. 5 in detail, 11b has a ring shape, and each surface is formed into a planar shape, but as shown in FIG. A ring-shaped protrusion 11a is provided on the protrusion 11a, and the wire wire W is held between the protrusions 11a, or as shown in FIG. It is also possible to use a shape in which a notch portion 11a'''' is provided in a part. Returning again to FIG. 2, the tip of the valve support 10 on the axis is connected to the tail piece 1 provided at the rear end of the pipe joint 13 .
4, and a small gap is maintained between the inner circumferential surface of the transition piece 14 and the outer circumferential surface of the tip end portion of the valve support body 10 on the flange 10b side. Thus, the flange 10b of the valve support 10 faces the end of the transition piece 14 of the pipe joint 13 with a small gap, and the protrusion formed at the center of the flange 10b is located inside the end of the transition piece 14. Because it is located at
In this way, the valve support 10 is held within the air supply device 3. Further, the transition piece 14 of the pipe joint 13 is provided with a ventilation slit 15 parallel to its axis. Further, a thread is formed on the outer circumferential surface of the body section 16 of the pipe joint 13 so that it can be screwed onto the inner circumferential surface of the base tube 3a of the air supply device 3. A check ring 18 is formed on the outer peripheral surface of the connecting tube 17 to prevent the connecting tube 5 from being pulled out. In addition, base cylinder 3
An airtight packing 19 is clamped between the opening a and the body 16 of the pipe joint 13 . An exhaust hole 20 is formed in a part of the peripheral wall of the base cylinder 3a of the air supply device 3 , and a valve housing cylinder 21 is connected to surround the exhaust hole 20. Further, a valve auxiliary material 22 made of rubber or the like is mounted on the upper opening edge of the valve storage cylinder 21, and a cap 23 having a substantially bottomed cylindrical shape is screwed to cover the valve auxiliary material 22. A return spring 24 is housed inside the valve storage cylinder 21, and the upper end of this return spring 24 is engaged with a quick exhaust valve 25. It is pressed against the auxiliary material 22, thereby maintaining airtightness inside and outside the valve housing cylinder 21. A valve rod 26 is integrally connected to the rapid exhaust valve 25, and the valve rod 26 has a substantially bottomed cylindrical shape that passes through the valve auxiliary material 22 and the cap 23 and covers the cap 23. is fixed to the top plate of the push button 27. That is, the quick exhaust valve 25 is operated by the push button 2.
7 or release the valve housing cylinder 21.
It can be moved elastically up and down inside. Note that in FIG. 2, reference numeral 8 indicates an adjustment screw provided in the transition piece 3b, and reference numeral 8a indicates a through hole thereof, but these are not related to the features of the present application and do not need to be provided separately. Next, the operation of the present invention will be explained. First, press the pressure ball 4 to release the tail tube 3b of the air supply device 3.
Sends pressurized air inside. This pressurized air is filtered to remove dust contained therein, and the rubber body 11
The valve support 10 is pressed through the gap 12 formed between the rubber body 11b and the bottom plate 3d of the base cylinder 3a, and the inside of the base cylinder 3a is flow into. In this case, if the wire wire is simply placed between the rubber bodies, pressure may be applied by the pressure ball 4, or in the case of gradual exhaust described later, the rubber bodies may be separated due to vibration etc. Closed rubber body 11a and rubber body 11
There may be a gap between the wire wire W and the wire wire W, which is held between the wire wire W and the wire wire B, and the wire wire W, which is held between the two wires, may shift as shown in Fig. However, in this embodiment, the wire line W has an L-shape and is supported by the wire stopper S, so it moves in parallel following the movements of the rubber bodies 11a and 11b. Therefore, as shown in FIG. 8, there is no misalignment and there is an advantage that it can easily return to its original state. Also, the wire wire W may be damaged due to vibration etc.
is securely supported by the wire stopper S,
Moreover, since the wire stopper S is held within the valve support body 10, the wire line W will not jump out. By the way, the pressurized air gradually passes through the exhaust hole 9 of the transition piece 3b.
However, by gradually making the exhaust hole 9 minute, the fluid resistance can be increased, air leakage can be reduced, and most of the pressurized air can be guided into the base cylinder 3a. The air sent into the base tube 3a enters the tube joint 13 through a slit 15 formed in the transition tube 14 of the tube joint 13 , and is sent from the connecting tube 17 to the blood pressure monitor via the connecting tube 5 as shown in FIG. It is sent to the main body 1 and cuff band 2, and the pressure of cuff band 2 is approximately 20 mm lower than the systolic blood pressure value.
Set the value as high as Hg and stop pressurizing. At this time, the air sent into the base cylinder 3a passes through the flange 10b of the valve support 10 to the pair of rubber bodies 11.
Since the rubber bodies 11a, 11b are pressed against the bottom plate 3d of the base cylinder 3a, the gap created by the rubber bodies 11a, 11b and the wire wire W is almost closed, and the valve support 10 and the rubber body 11a are pressed together. , 11b act as substantially check valves for pressurized air. When measuring systolic and diastolic blood pressure, use cuff band 2.
This is carried out by blocking the blood flow in the blood vessels of the person to be measured using the internal pressure of the air sent into the body, and by gradually and isobarically exhausting the pressure in the cuff band 2. This gradual evacuation effect based on the present invention will be explained below. That is, after the pressure applied by the pressure ball 4 is stopped, the pressure in the cuff band 2 continues to reach the inside of the base tube 3a, but in this case, the pressure causes the valve support 1
0 is pressed against the pressure ball 4 side and sealed,
There is no particular air leakage. However, since a gap corresponding to the diameter of the wire W is formed between the rubber bodies 11a and 11b by the wire wire W provided between the rubber bodies 11a and 11b, the base The air inside 3a passes through this gap, further passes through the gap 12, and is exhausted to the outside from the exhaust hole 9, and is gradually exhausted in this way. The gap between the rubber bodies 11a and 11b can be adjusted by changing the wire diameter of the wire wire W.
Therefore, the exhaust speed during exhausting can be freely changed gradually. Here, when the pressure of the cuff band 2 is high, the flange 10b of the valve support body 10 strongly presses the rubber bodies 11a, 11b, so the gap becomes small, and when the pressure of the cuff band 2 decreases, the Rubber bodies 11a, 1 so that the gap becomes large
Since the elastic force of 1b is restored and adjusted, a substantially constant pressure drop rate, for example 2-3 mmHg/sec, can be set and maintained. After measuring the blood pressure value, it is desirable to quickly release the person to be measured from the pressure burden of the cuff band 2. For this purpose, the quick exhaust valve 25 is opened, but in the present invention, by pushing down the push button 27 against the elastic force of the return spring 24, the quick exhaust valve 25 is lowered via the valve rod 26, and the base cylinder is opened. Rapid exhaust is performed by communicating the exhaust hole 20 of 3a with the outside. 9 to 15 show other embodiments of the invention. In the above-mentioned embodiment, the rubber body 11a and the rubber body 11b are constructed in the shape shown in FIG. 5, and the wire wire W is inserted between them to gradually exhaust air through the gap. However, there is a problem in that its exhaust characteristics draw a curve as shown in FIG. 14, and a strict equal pressure exhaust speed cannot be obtained. Therefore, this embodiment is characterized in that the isobaric exhaust characteristics are improved by changing the shape of the rubber body 11b. That is, in this embodiment, as shown in FIGS. 9A and 9B, one end surface of the rubber body 11a is formed into a tapered shape that bulges toward the center. On the other hand, the rubber body 11b is formed in the same manner as in the previous embodiment, as shown in FIGS. 10A and 10B. Further, FIG. 11 shows a case where the rubber body 11a of this embodiment is incorporated together with the valve support body 10 in the air supply device 3 . Note that FIG. 11 shows a state in which the pressure of the cuff band 2 is under no load. The operation is basically the same as the previous embodiment, but in this embodiment, the pressure of the cuff band 2 applied inside the air supply device 3 as shown by the arrow is caused by the pressure between the rubber body 11a and the rubber body 11b. It passes through the gap created by the wire wire W inserted between the two, conducts into the inside of the valve support 10, and is exhausted to the atmosphere. At this time, at high pressure (200mmHg or more 300mmHg
(below), since the magnitude of the pressure applied to the flange 10b of the valve support 10 is large, the rubber body 1
1a, the gap created between the rubber body 11b and the wire wire W is reduced. On the other hand, at low pressure (20~100mmHg)
Since the pressure applied to the valve support body 10 is also becoming smaller, the gap between the rubber bodies 11a, 11b and the wire wire W tends to return to its original state when no pressure is applied, and the gap becomes large. Such an increase or decrease in the gap corresponds to an increase or decrease in the exhaust area, and if it is made smaller at high pressure and larger at low pressure, equal pressure exhaust characteristics will be obtained. Figure 12 A and B show the rubber body 11 at high pressure.
The state of the gap between a and 11b is shown, where A is a plan view and B is a side view. Also, the first
Figure 3 A and B show the state of the gap at low pressure. As described above, in this embodiment, the other rubber body 11a is tapered on the opposite surface side of the rubber body 11b.
As a result, the followability to the pressure value of the cuff band 2 is improved, and the displacement of the gap between the rubber body 11a, the rubber body 11b, the wire wire W, etc. becomes large as shown in FIGS. 12 and 13. There is an advantage that the evacuation speed of the pressure value of the cuff band 2 is more equal pressure than in the above-mentioned embodiment. FIG. 15 shows the exhaust characteristic curve in this embodiment. As is clear from this figure, in this embodiment, the pressure in the cuff band can be gradually exhausted at equal differential pressure, and as a result, the systolic blood pressure value of the sphygmomanometer,
This has the advantage of improving the accuracy of determining the diastolic blood pressure value and reducing display errors. FIGS. 16 and 17 show still other embodiments of the present invention. In this embodiment, two rubber bodies 11
The shape of the wire wire W inserted to set a gap between a and 11b can be changed from an L-shaped shape as shown in FIG. It is characterized in that it is supported by a wire stopper S' and is formed into an almost cross shape as a whole. The wire stopper S' has a square or cubic shape, and is made of an elastic member such as soft PVC or rubber. In connection with the wire wire W, the wire wire W may be inserted into the wire stopper S' to be integrated, or may be manufactured by simultaneous molding. In this case, the wire stopper S' is appropriately set to prevent the wire wire W from protruding and to also take into consideration ease of assembly when the wire wire W is arranged between the rubber body 11a and the rubber body 11b. . Therefore, when attaching to the valve support 10, first the rubber body 11a is attached to the flange 10b side cylindrical portion 10a.
the slits in the cylindrical portion 10a.
Insert the wire W through T'. The wire stopper S' having the wire wire W is the cylindrical part 10a.
It is located on the inner peripheral surface, thereby supporting the wire line W. After that, the assembly is completed by attaching the rubber body 11b. In operation, as in the previous embodiment, the pressure of the cuff band acts on the valve support 10, narrowing the gap provided through the wire W between the rubber bodies 11a and 11b. Therefore, the gap changes depending on the magnitude of the pressure, and the area of the pressure outlet changes, making it possible to perform equal differential pressure exhaust. (Effects of the Invention) As described above, according to the present invention, the wire line is supported through the wire stopper held in the valve support body, and the wire line is arranged to form a gap between the pair of rubber bodies. Since the wire line is supported by a wire stopper, the wire line will not jump out from between the rubber bodies even when subjected to vibrations or shocks applied from the outside, thus ensuring stable and gradual exhaustion. Obtainable. Furthermore, even if a gap is created between the rubber bodies due to vibration or the like, the wire line is held on the valve support by the stopper, so the wire line will not shift. Furthermore, if the stopper is formed of a cylindrical member and an L-shaped wire is inserted and fixed into a slit with a small gap provided in the stopper made of the cylindrical member, the wire can be easily removed during assembly. There is no deviation in the angle of the wires, so the gap between the rubber bodies is stable, and the exhaust characteristics are gradually stabilized, thereby preventing variations in quality. Furthermore, assembly can be facilitated by forming the wire into an L-shape and inserting it into the slit of the stopper and incorporating it into the valve support. Furthermore, by forming the facing surfaces of one of the rubber bodies in a tapered shape, there is an advantage that the exhaust characteristics become gradually more stable compared to a case where the mutually facing surfaces are simply flat.

[Brief explanation of drawings]

Fig. 1 is a partially sectional perspective view showing a state in which blood pressure is measured using the present invention, Fig. 2 is a vertical sectional view of the present invention, and Fig. 3 is a perspective view showing the main parts of the present invention. Figure 4 is a partial sectional view of the present invention, Figure 5 is a perspective view of a rubber body used in the present invention, Figures 6 and 7 are other embodiments of the same rubber body, and Figure A is a cross section. Figures 9A and 9B are side views, Figure 8 is an explanatory diagram in an operating state, Figures 9 to 15 show other embodiments of the present invention, and Figures 9A and 9 are explanatory diagrams of one rubber body. , FIGS. 10A and 10B are explanatory diagrams of the other rubber body, FIG. 11 is a cross-sectional explanatory diagram showing the gradual exhaust mechanism in this embodiment, FIGS. 12 and 13 are operational explanatory diagrams, and FIG. 14 is an explanatory diagram of the 1 to 8, FIG. 15 is an exhaust characteristic diagram of this embodiment, and FIGS. 16 A to 17 are further embodiments of the present invention. . 1... Sphygmomanometer body, 2... Cuff band, 3 ... Air supply device, 3a... Base tube, 3b... Tail tube, 3c... Cylinder body, 3d... Bottom plate, 4... Pressure ball, 6... Check ring, 7... Filter, 9... Gradual exhaust hole, 10
... Valve support body, 10a ... Cylindrical part, 10b ... Flange, 11a, 11b ... Rubber body, 12 ... Gap, 13 ... Pipe joint, 14 ... Transition piece, 15 ... Slit, 16 ... Body, 17... Connection tube, 18...
...Check ring, 19...Airtight gasket, 20...Exhaust hole, 21...Valve housing cylinder, 22...Valve auxiliary material, 2
3...Cap, 24...Return spring, 25...Rapid exhaust valve, 26...Valve lever, 27...Push button, W
...Wire wire, S, S'...Wire stopper, T, T'...Slit.

Claims (1)

[Claims] 1. In a gradual exhaust mechanism of a blood pressure monitor that is provided between a pressure ball and a cuff band and gradually exhausts air pressure in the cuff band during blood pressure measurement, a non-return check that has a substantially cylindrical shape and is connected to the pressure ball side. In a cylinder that is attached to the air supply port of the pressurizing ball and constitutes an air supply device, which is made up of a transition piece that has a ring on its outer periphery and further has an exhaust hole, and a base cylinder that is connected to the transition piece. The air flow path between the cuff band and the pressurizing ball has a flange and a cylindrical portion with a partial notch, the cylindrical portion facing the tail cylinder and the flange facing into the base cylinder. A valve support is provided, and on the outer periphery of the cylindrical portion of the valve support,
A pair of substantially ring-shaped rubber bodies forming a check valve together with the valve support body are provided, and a wire wire supported by a stopper is sandwiched between the pair of rubber bodies, and the wire wire is inserted through the flange by pressure from the cuff band. The wire between the rubber bodies is pressed so as to press the pair of rubber bodies against the bottom plate, which is the connecting part between the base tube and the tail tube, and elastically deforms in response to the pressure from the cuff band. Formed on the side of the line,
A gradual exhaust mechanism for a blood pressure monitor, characterized in that the air pressure in the cuff band is gradually exhausted from the exhaust hole through this interval.