JP2002108456A - Device for adjusting fluid flow rate, exhauster for sphygmometer and sphygmometer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid flow rate adjusting device and an exhauster for a sphygmometer which can perform highly accurate control and has a long life, and a sphygmometer using the exhauster for a sphygmometer. SOLUTION: This fluid flow rate adjusting device 200 for adjusting the flow rate of fluid made to flow through an inflow port point 251 by opening and closing the point 251 provided in a cap 250 with a valve member 402 is provided with a valve opening/closing mechanism 401 for supporting the member 402 while applying force in an opening or closing direction, the cap 250 for fixing the mechanism 401 and a driving system 310 for opening/closing the member 402 to adjust the flow rate by applying force that is in a reverse direction from the force by the mechanism 401 to the member 402.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid flow control device, a sphygmomanometer exhaust device capable of evacuating air supplied into an arm band at a constant speed, and a blood pressure using the sphygmomanometer exhaust device. About the total.

[0002]

2. Description of the Related Art FIG. 9 shows an example of the structure of an electric sphygmomanometer. The electric sphygmomanometer includes an arm band 1 mounted to be wound around an arm, a wrist, a finger, or the like of a human body, a pump 2 for supplying compressed air to the arm body 1, and a pressure gauge for detecting air pressure in the arm band 1. 3, a sphygmomanometer evacuation device 4 for discharging the air in the arm band 1 through the outlet pipe 6, and controlling the operation of the pump 2 based on the detection signal from the pressure gauge 3 to be constant to the arm band 1. A microcomputer 5 for supplying air at a high pressure and controlling the operation of the sphygmomanometer exhaust device 4 to exhaust air from the arm band 1 at a constant speed.

Here, a conventional example of the blood pressure monitor exhaust device 4 will be described with reference to FIG. In this example, the sphygmomanometer exhaust device 4 includes housings 111 and 1.
A discharge pipe 113 having an inflow port 114 is provided at the center of the end face of the housing 111. The outlet pipe 113 is connected to the outlet pipe 6, and the blood pressure monitor exhaust device 4 is connected to the arm band 1 via the outlet pipe 6.
Connected to

On the other hand, the yoke 1 is
A ferromagnetic magnet 121 is attached to the yoke 122. A driving device 123 to which a coil 124 is fixed is installed in the cylindrical hollow portion of the yoke 122, and is supported by the yoke 122 so as to be movable in the axial direction of the coil 124. The driving device 123 further includes a valve 13 having rubber elasticity on the end surface on the inflow port 114 side.
One. The valve 131 is connected to the inflow port 11
4, the inlet end 1 which is the end on the drive device 123 side.
17 and opposite.

Further, a housing chamber 116 surrounded by the housings 111 and 112 and the driving device 123 is formed inside the sphygmomanometer exhaust device. At least one communication port is formed in the housing chamber 116 so that gas can flow to the outside of the exhaust device for a sphygmomanometer. The spring 132 urges the driving device 123 to push the driving device 123 from the inflow end 117. The coil 1
Reference numeral 24 is connected to a conduction terminal 125 through a conduction line 126, and from here is connected to a power supply to be appropriately energized.

When the coil 124 is not energized, the driving device 123 is in the open position shown in FIG. At this time, the pressurized air in the cuff 1 is
6 and flows away from there. The coil 12
4 is energized, the driving device 123 is pressed against the inflow end 117 in proportion to the magnitude of the voltage.
Then, the external air flow velocity of the pressurized air in the arm band 1 is controlled to a desired value depending on the size of the gap formed by the inflow end 117 and the valve 131.

[0007]

However, it has been found by the present inventors that these conventional techniques have the following problems. The first problem is that since the valve 131 is directly fixed to the driving device 123, any slight vibration or blurring of the driving device 123 is also transmitted to the valve 131. The accuracy of the control of the speed at which the compressed air flows to the outside is reduced.

[0008] The second problem is that the drive device 123 to which the conductive wire 126 moves and the conductive terminal 125 fixed to the housing 112 are connected. The conductive terminal 126 is provided with a deflection amount so that the conductive terminal 1 can be bent.
The soldering of the conductive wire 126 having a necessary and sufficient flexure is a difficult and complicated operation.

A third problem is that even if the soldering is completed, the conductive line 126 is likely to be broken due to the long-term operation of the driving device 123, causing a failure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and is capable of performing highly accurate control and having a long life.
An object of the present invention is to provide a fluid flow control device, a blood pressure monitor exhaust device, and a blood pressure monitor using the same.

[0011]

As a result of diligent studies conducted by the present inventors, in order to solve the above-mentioned problems, a valve structure has been improved so that a slight vibration or blurring of the driving device is hardly transmitted to the valve. It was found that it was necessary to stop the use of conducting wires having an amount of deflection.

The present invention has been made based on the result of this elucidation, and a first invention is a fluid flow rate adjusting a flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member. In the adjusting device, a biasing member that supports the valve member while applying a force in the opening or closing direction, a housing that fixes the biasing member, and a force in a direction opposite to the force by the biasing member is applied to the valve member. And a drive device for opening and closing the valve member to adjust the flow rate.

According to a second aspect of the present invention, there is provided a fluid flow control device for controlling a flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member. A driving device that opens and closes the valve member to adjust a flow rate by applying a force in a direction opposite to a force of the urging member to the urging member to be supported while applying the force to the valve member; The drive device has a coil that allows a current to flow in a direction crossing the line of magnetic force, and the driving device is supported by a support member having one end fixed to the housing so as to be able to move back and forth in the axial direction of the coil, and serves as a conductive line for the current flowing in the coil. A fluid flow control device using the support member.

According to a third aspect of the present invention, there is provided a fluid flow control device for controlling a flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member. A driving device that opens and closes the valve member to adjust a flow rate by applying a force in a direction opposite to a force of the urging member to the urging member to be supported while applying the force to the valve member; The drive device is provided with a coil for flowing an electric current in a direction crossing the line of magnetic force. The drive device is supported at one end by a support member fixed to the housing so as to be able to move back and forth in the axial direction of the coil, and the coil is wound around a substantially rectangular parallelepiped bobbin. A fluid flow control device, which receives a line of magnetic force penetrating in a wider surface of the substantially rectangular parallelepiped and applies a desired current to the coil to obtain a driving force for moving back and forth in the axial direction. A.

According to a fourth aspect of the present invention, the support member is integrally formed at the time of manufacture, and after being installed in the driving device, is cut at a desired position to form a plurality of support members. Is a fluid flow control device.

According to a fifth aspect of the present invention, in the fluid flow control device according to the third aspect, the magnetic field lines are generated by attaching a substantially rectangular magnet to a substantially U-shaped yoke. is there.

According to a sixth aspect of the present invention, there is provided an exhaust device for a sphygmomanometer using the fluid flow control device according to any one of the first to fifth aspects.

A seventh aspect of the present invention is a sphygmomanometer using the sphygmomanometer evacuation device according to the sixth aspect.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. (Outline of Overall Structure) In FIG. 1, reference numeral 200 denotes a fluid flow control device (hereinafter, referred to as "flow control device") according to the present embodiment. 1 and 2, the flow control device 200 includes a housing 201, a lid 250 as an upper housing, and the lid 25 as a fluid passage.
0, a valve opening / closing mechanism 401 for opening and closing the inflow port 251 and a driving device 310 for opening and closing the valve opening / closing mechanism 401. The driving device 310 is provided at two locations (the lid 250 side and the later-described position). A coil 316 to be described later is supported by the support members 501 and 551 on the
Are supported movably back and forth along the axis of. (In FIG. 1, portions corresponding to FIG. 6 are denoted by the same reference numerals, and in FIG. 2, portions corresponding to FIGS. 4 and 6 are denoted by the same reference numerals.)

Further, the driving device 310 includes a pair of U-shaped first and second yokes 351 and 352 mounted inside the housing 201 and the yokes 351 and 352.
Is disposed in a gap formed by the first magnet 361 and the second magnet 362 installed in the support member 50.
1, 551, the coils 316 and the like, which are components of the driving device 310, are held in a non-contact state with the yokes 351 and 352 and the magnets 361 and 362.

(Structure of Housing) Next, the structure of the housing 201 will be described with reference to FIGS. The housing 201 is formed in a rectangular parallelepiped shape, and a storage hole 202 whose one end is closed is formed in the center of the housing 201, and a first through hole 209 and a second through hole 210 are further formed in a closed bottom. Further, a pair of first conductive terminals 205 and second conductive terminals 206 are provided to penetrate the housing 201.

On the other hand, the open end face of the housing hole 202 formed in the housing 201 has a structure in which the lid 250 can be closed by attaching two to four screws (two of which are shown) 254 and 255. Has become. in addition,
On the open end side of the housing 201, a pair of first protrusions 20 to which the lid-side support member 501 is guided and fixed is provided.
3. The second protrusion 204 is provided. Further, on the closed end side of the housing 201, the PC plate side support member 5 is provided.
A concave portion 211 for accommodating the first and second rectangular through holes 209 and 210 is formed in the concave portion 211 in which the first and second rectangular through holes 209 are accommodated.
The protrusion 317 and the second protrusion 318 penetrate. Further, a pair of first PC board side support member support pins 207 and a second PC board side support member support pin 208 are provided, and the PC board side support member 551 is guided and fixed. The recess 21
1 is closed by a PC board (printed circuit board) 240 after component installation in this portion is completed.

(Structure of Lid) Next, the structure of the lid 250 will be described with reference to FIGS. Inlet tip 2
In the present embodiment, 51 is formed at the end of an inflow port 252 provided through the center of the lid 250,
On the other hand, the other end of the inflow port protrudes from the lid 250 to form a discharge pipe 253 to which the outlet pipe 6 communicating with the arm band 1 is connected. Further, a pair of first lid square holes 256 and second lid square holes 257 are formed in the lid 250. This is the first recess 40 of the valve opening / closing mechanism 401 described later.
3, for fitting with the second concave portion 404. When the flow rate control device 200 is used as an exhaust device for a sphygmomanometer or the like, even after the lid 250 is fixed to the housing 201, air flows between the inside and the outside formed by the lid 250 and the housing 201. A communication port is provided so that it is possible.

(Structure of Valve Opening / Closing Mechanism) Next, the structure of the valve opening / closing mechanism 401 will be described with reference to FIGS.
6 and 7, the valve opening / closing mechanism 401 is formed of an elastic material such as rubber, and has a first concave portion 403 and a second concave portion 404 fitted with the lid 250 at both ends thereof.
After guiding the first concave portion 403 and the second concave portion 404, the first pin 405 and the second pin 4 projecting to the outside from the first lid square hole 256 and the second square hole 257, respectively.
06 are formed. Further, fine irregularities are formed on the valve member 402 facing the inflow port tip. Here, as shown in FIG. 8, since the size and number of each of the irregularities enables a minute adjustment of the amount of air flowing in at a constant speed from the inflow end 251, it is built into the arm band 1. The appropriate selection is made in consideration of the capacity of the air bag to be used.

(Attachment of Valve Opening / Closing Mechanism to Lid) Next, attachment of the valve opening / closing mechanism 401 to the lid 250 will be described with reference to FIG. The valve opening / closing mechanism 401 includes:
A pair of first lid square holes 256 in the lid 250,
The pair of first pins 405 and the second
By passing the pins 406 through and pulling them out, the pair of first lid square holes 256 and the second lid square holes 257 are fitted into the first recess 403 and the second recess 404, respectively. Attach.

At this time, when the flow rate adjusting device 200 is used as an exhaust device for a sphygmomanometer, the valve member 402
When the drive unit 310 is de-energized, a force that does not block the inflow end 251 is given by the elastic force of the elastic material. It is necessary that the magnitude of this force is such that the valve member 402 does not block the inflow end 251 irrespective of the posture of the flow control device 200. By adopting this configuration, during blood pressure measurement,
If the power is turned off due to a failure or the like, the air in the arm band 1 is released, and the load on the human body can be quickly removed. On the other hand, in a general application of the flow rate adjusting device 200, a configuration may be adopted in which a force that closes the inlet 251 is applied by the elastic force when the drive device 310 is de-energized. That is, the valve opening / closing mechanism 4
Reference numeral 01 functions as an urging member for supporting the valve member 402 while applying a force in the opening or closing direction.

Further, by adopting the above-mentioned structure, even a slight vibration or blurring of the drive device, which is a problem of the conventional technology, is transmitted to the valve member, and as a result, the pressurized air in the arm band flows out. It was possible to prevent the accuracy of the speed control from deteriorating. That is, in the present embodiment, the valve opening / closing mechanism 401 is fixed to the lid 250. Therefore, when a desired current is supplied to the driving device 310 and the driving device 310 presses the valve member 402 with a desired force in the opposite direction to the force urged by the valve opening / closing mechanism 401, The vibration and the shake of the driving device 310 are less likely to be transmitted to the valve member 402 because they are merely in contact with each other via the valve member pressing portion 315 described later.

(Structure of Driving Device) Next, the driving device 31
0 will be described with reference to FIGS. The pair of U-shaped first yokes 351 and the second yoke 352 are formed by molding a magnetic material into a U-shape, and the outer shape thereof is equal to or less than the inner size of the storage hole 202 of the housing 201. Further, the first yoke 351 and the second yoke 352 have the first magnet 361 and the second magnet 36, respectively.
2 are attached with an adhesive or the like so that the S poles or N poles have the same polarity, and a magnetic flux is formed in a U-shaped facing direction.

In the present embodiment, two joined bodies of the yoke and the magnet are used as a pair, but one may be used. As for the shape of the yoke, another yoke may be attached, for example, so as to cover the U-shape. This configuration is preferable because the magnetic flux density can be increased and the power consumption of the flow rate control device can be reduced. FIG. 11 shows an embodiment 600 of the flow control device provided with the lid-shaped yoke 353. (In FIG. 11, portions corresponding to those in FIG. 1 are denoted by the same reference numerals.)

The driving device 310 has a substantially rectangular parallelepiped bobbin 3.
A coil 19 is formed by winding a conductive wire around 19.
At this time, the coil 316 is wound so that the direction of the current crosses the line of magnetic force. Further, the substantially rectangular parallelepiped bobbin 31
9, the coil 316 is wound so as to receive the penetrating lines of magnetic force on the wider surface. A pair of first coil conduction terminals 311 and a second coil conduction terminal 312 are provided on the upper part of the bobbin 319, and the conductor of the coil 316 is connected. Further, a pair of driving device positioning first protrusions 313 and second protrusions are provided. 314 and a valve member pressing portion 315 are provided.
A pair of first projections 317 and second projections 318 are provided below the bobbin 319, and the PC board-side support member 551 is provided.
Connected to Further, a yoke receiving hole 320 whose upper part is closed is formed in the center of the bobbin 319. When the driving device 310 is installed in the housing 201, the first yoke 351 and the second yoke 352 are closed. Each U-shaped piece is inserted. (See FIG. 5, (A))

By adopting this configuration, a flat magnet can be used instead of a conventional cylindrical magnet. For this reason, the cost of the magnet can be reduced, and at the same time, a magnet having a stronger magnetic force can be used. As a result, the drive device itself can be reduced in size and power consumption, and further, along with the size reduction of the flow control device due to the square shape of the drive device, the size and the power consumption can be significantly reduced without reducing the flow control ability. Electricity could be realized.

(Structure of Supporting Member) Next, the lid-side supporting member 5
01 and the structure of the PC board-side support member 551 will be described with reference to FIGS. In FIG. 4, both the lid-side support member 501 and the PC plate-side support member 551 are formed of a material having appropriate elasticity and strength, and are preferably made of phosphor bronze, brass, non-magnetic stainless steel, or the like. The lid-side support member 501 has a pair of first housing support positioning holes 5.
04, a second housing support positioning hole 505, a first fixing portion 506 and a second fixing portion 507 to a pair of housings, a pair of first drive device support positioning holes 508, a second drive device support positioning hole 509, a pair of drives A first fixing portion 510, a second fixing portion 511, and a pair of support member first bridge portions 512 and a second bridge portion 513 are provided to the apparatus.
The PC board-side support member 551 is provided with a pair of driving device first fixing portions 552, a second fixing portion 553, a pair of housing first fixing portions 554, and a second fixing portion 555.

(Integration of Support Member and Driving Device) Next, integration of the lid-side supporting member 501 with the driving device 310 will be described with reference to FIG. The lid-side support member 501 and the driving device 310 are connected to the first driving device support positioning hole 508, the second driving device support positioning hole 509, the driving device positioning first protrusion 313,
Each of the projections 314 is fitted and guided so as to be integrated. Next, the first fixing portion 510 and the second fixing portion 511 to the driving device and the first coil conduction terminal 311 and the second coil conduction terminal 312 are respectively fixed by soldering or the like.

Thereafter, the first bridge 51 of the support member 51
2. Both the second bridge portion 513 is cut by bending it upward. (See FIGS. 4, (B) and (C).) With this operation, the lid-side support member 501 is moved to the first lid-side support member 5.
02 and the second lid-side support member 503 are mechanically and electrically separated.

By adopting this configuration, the first lid-side support member 502 and the second lid-side support member 503 can be used as conducting wires to the coil 316, which has been a problem of the prior art. The breakage of the conduction line due to the long-term operation of the drive device could be solved.

Further, at the time of manufacture, the lid-side support member 501 can be manufactured as one integrally molded part.
In terms of assembling accuracy, one part is stably guided at two places, so that a dramatic improvement has been observed. This has greatly reduced the cost of parts, the cost of work, and extended the life of the apparatus.

(Incorporation of the lid, drive unit, etc. into the housing) Finally, based on FIGS. 2, 3, and 5, an integrated member of the valve opening / closing mechanism 401 to the lid 250 and the lid-side support member The incorporation of an integral part of the drive unit 501 and the drive unit 310 into the housing will be described.
(In FIG. 5, portions corresponding to those in FIG. 4 are denoted by the same reference numerals.) The first yoke 351 and the second yoke 351 having the first magnet 361 and the second magnet 362 adhered to the housing holes 202 of the housing 201, respectively. The yoke 352 is set. In FIG. 5, the lid-side support member 501 and the driving device 3
An integrated product of the first and second yoke 351 and the second yoke 352 is placed in the accommodation hole 202 while inserting the U-shaped ends of the first yoke 351 and the second yoke 352 into the yoke accommodation hole. At this time, after the first housing positioning hole 504 and the second housing positioning hole 505 are respectively fitted to the first protrusion 203 and the second protrusion 204, the first fixing portion 506 to the housing is formed. The second fixing portion 507 is mechanically and electrically coupled to the first conductive terminal 205 and the second conductive terminal 206 by soldering or the like. (FIG. 5, (A), (B)
reference)

By employing the above configuration, the work of soldering to the conductive terminal in a state where the conductive wire is bent, which is a problem of the prior art, becomes unnecessary, thereby reducing the working cost and the length of the apparatus. There was a great effect on extending the life. As a different embodiment of this configuration, the PC board-side support member 551 is electrically divided and used as a conducting wire instead of the cover-side support member 501, or the cover-side support member 501 and P
It is also conceivable to use both of the C-plate-side support members 551 as conducting wires. These can be appropriately selected according to design and work requirements.

In FIG. 3, the first projection 317 and the second projection 318 of the driving device penetrating the first through hole 209 and the second through hole 210 formed in the recess 211.
And the driving device first fixing portion 552 and the second fixing portion 553 formed in the PC board-side support member 551 are fitted and fixed respectively. Similarly, the PC board side support member support first pin 2
07, the second pin 208 and the housing first fixing portion 55
4. The PC board 240 is fitted and fixed to the housing 201, and the recess 211 is closed. Then, on the land on the PC board 240,
The first conduction terminal 205 and the second conduction terminal 206 may be soldered or the like.

Finally, the integrated body of the valve opening / closing mechanism 401 to the lid 250 is fixed to the housing 201 by using the screws 254 and 255 to complete the flow control device.

[0041]

As described in detail above, the present invention relates to a fluid flow control device for controlling the flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member.
An urging member that supports the valve member while applying a force in the opening or closing direction, a housing that fixes the urging member, and by applying a force in a direction opposite to the force by the urging member to the valve member, By having a drive unit that opens and closes the valve member to adjust the flow rate, the valve structure is modified so that a slight vibration or blurring of the drive unit is hardly transmitted to the valve, and a conduction with a deflection is provided. The use of wire could be stopped.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing one embodiment of the present invention.

FIG. 3 is an exploded perspective view showing a bottom surface portion of a housing showing one embodiment of the present invention.

FIG. 4 is a perspective view showing an embodiment of the present invention, in which a support member and a driving device are integrated.

FIG. 5 is a perspective view showing one embodiment of the present invention, in which an integrated member of a support member and a driving device is installed in a housing.

FIG. 6 is an external perspective view of a valve opening / closing mechanism, showing one embodiment of the present invention.

FIG. 7 is a perspective view showing an embodiment of the present invention, showing attachment of a valve opening / closing mechanism to a lid.

FIG. 8 is a cross-sectional view showing a state of contact between a valve member and an inflow port end according to an embodiment of the present invention.

FIG. 9 is a schematic view showing one structural example of a sphygmomanometer.

FIG. 10 is a side sectional view showing an example of a conventional blood pressure monitor exhaust device.

FIG. 11 is a partially cutaway side view showing a different embodiment of the present invention.

[Explanation of symbols]

200: flow control device, 201: housing, 205:
1st conduction terminal, 240 ... PC board, 250 ... lid, 30
DESCRIPTION OF SYMBOLS 1 ... drive mechanism, 316 ... coil, 351 ... 1st yoke, 361 ... 1st magnet, 401 ... valve opening / closing mechanism, 501
... Valve side support member, 551 ... PC board side support member

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification FI FI Theme Court ゛ (Reference) F16K 31/08 A61B 5/02 336E (72) Inventor Kenji Kogure 2508-13 Nakago, Komochimura, Kita Gunma County, Gunma F-term (reference) in Japan Precision Instruments Co., Ltd.

Claims (7)

[Claims] 1. A fluid flow control device for controlling a flow rate of a fluid passing through a fluid flow port by opening and closing a fluid flow port with a valve member, wherein the fluid flow port supports the valve member while applying a force in an opening or closing direction. An urging member, a housing for fixing the urging member, and a driving device that opens and closes the valve member to adjust a flow rate by applying a force in a direction opposite to a force of the urging member to the valve member. A fluid flow control device, comprising: 2. A fluid flow control device for controlling the flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member, wherein the valve member is supported while applying a force to the valve member in an opening or closing direction. By applying a force in the opposite direction to the force by the urging member and the urging member to the valve member, a driving device that opens and closes the valve member to adjust the flow rate,
The driving device has a coil for passing an electric current in a direction crossing the line of magnetic force, and the driving device is supported at one end by a supporting member fixed to a housing so as to be able to move back and forth in the axial direction of the coil, and a current flowing to the coil is provided. A fluid flow control device, wherein the support member is used as a conduction line for the fluid. 3. A fluid flow control device for adjusting a flow rate of a fluid passing through the fluid flow opening by opening and closing the fluid flow opening with a valve member, wherein the valve member is supported while applying a force to the valve member in an opening or closing direction. By applying a force in a direction opposite to the force by the urging member to the urging member and the valve member,
A drive device that opens and closes the valve member to adjust the flow rate, the drive device includes a coil that passes an electric current in a direction crossing the line of magnetic force, and the drive device has a coil fixed by a support member having one end fixed to a housing. The coil is wound around a substantially rectangular parallelepiped bobbin, and receives a line of magnetic force that penetrates a wide surface of the substantially rectangular parallelepiped, and flows a desired current through the coil. A fluid flow control device that obtains a driving force that moves back and forth in the axial direction. 4. The fluid flow control according to claim 2, wherein the support member is integrally formed at the time of manufacture, and is cut at a desired portion after being installed in the driving device to form a plurality of support members. apparatus. 5. The fluid flow control device according to claim 3, wherein the magnetic field lines are generated by attaching a substantially rectangular parallelepiped magnet to a substantially U-shaped yoke. 6. An exhaust device for a sphygmomanometer, wherein the fluid flow control device according to claim 1 is used. 7. A sphygmomanometer using the sphygmomanometer evacuation device according to claim 6.