JP2000201901A - Sphygmomanometer pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce size by obviating a mechanism for changing rotary motion to linear motion, and to prevent the occurrence of radion wave jamming since a brush is not used by using a linear DC motor as a driving means. SOLUTION: A pulse current is supplied from a driving circuit, and at electric current ON time, a yoke 219, a spindle holder 217, magnets 231, 223 and a spindle 215 move in the arrow A direction by reaction of propulsion generated in coils 205, 207. At this time, a coil spring 225 is compressed, and when an electric current is cut off, the coil spring 225 moves in the arrow B direction by the elastic resiliency, and returns to a former position. When the spindle 215 moves in the arrow B direction, pressure in a diaphragm 105 reduces, and a neck part of an intake valve 119 extends, so that outside air enters the diaphragm 105 from an intake port 115. When the spindle 215 moves in the arrow A direction, the pressure increases, and a neck part of an exhaust valve 129 extends, so that air in the diaphragm 105 goes out of an air delivery port 127 and an air delivery port 113.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pump for a sphygmomanometer having a pump having a diaphragm, an intake valve and an exhaust valve, and a driving means for oscillating the diaphragm.

[0002]

2. Description of the Related Art In recent years, portable sphygmomanometers driven by batteries have been provided on the market. FIGS. 11 and 12 show an example of a pump used in such a battery-driven portable blood pressure monitor. FIG. 11 is a cross-sectional view taken along a cutting line AA in FIG. 12, and FIG. 12 is a top view of FIG.

[0003] In the figure, a collar 5 is attached to an output shaft 3 of a DC motor 1. The collar 5 is provided with a drive shaft 7 inclined at a predetermined angle with respect to the output shaft 3 and having a tip coaxial with the output shaft 3.

The drive shaft 7 is provided at its center with a cylindrical support 9a into which the drive shaft 7 is loosely fitted, and is attached with a disk 9 having three holes 9b formed concentrically at equal intervals. I have. Therefore, when the output shaft 7 rotates, the drive shaft 7 rotates in an inclined state, and the vicinity of the hole 9b of the disk 9 moves up and down sequentially.

[0005] Case 11 to which DC motor 1 is attached
Are formed concentrically at regular intervals on the upper surface of the. Reference numeral 13 denotes a diaphragm made of an elastic material such as rubber. This diaphragm 13 is a hole 11a of the case 11
A bell-shaped diaphragm portion 15 that fits into the exhaust valve body portion 17 and a cylindrical exhaust valve body portion 17. The exhaust valve portion 17 has a cut in the generatrix direction corresponding to the diaphragm portion 15.

The drive unit 1 is provided on the bottom of the diaphragm 15.
9 is formed, and the driving portion 19 is fitted in the hole 9 b of the disk 9. At the center of the lid 21 provided so as to cover the upper surface of the case 11, a cylindrical portion 23 is formed in which the exhaust valve body 17 of the diaphragm 13 in a natural state presses against the inner wall surface.

On the lid 21, a diaphragm 15
, An intake valve 25 is provided. Next, the operation of the above configuration will be described.

When the DC motor 1 is driven, the vicinity of the hole 9b of the disk 9 sequentially moves up and down.
The volume of the third diaphragm portion 15 changes periodically. When the drive section 19 is lowered to increase the volume of the diaphragm section 15, the exhaust valve body section 17 of the diaphragm 13 is
3, the intake valve 25 is opened, and external air is taken into the diaphragm 15.

The drive unit 19 is raised, and the diaphragm unit 15
Is reduced, the intake valve 25 is closed, the exhaust valve body 17 of the diaphragm 13 is separated from the inner wall surface of the cylindrical portion 23,
The air in the diaphragm part 15 is discharged from the cylindrical part 23.

[0010]

However, the blood pressure pump having the above configuration has the following problems. (1) As a driving means for driving the diaphragm portion 15 of the diaphragm 13, the DC motor 1 is composed of a driving shaft 7, a disk 9, and a driving portion 19, and the rotational motion of the DC motor 1 is changed into a vertical motion (linear motion). A conversion mechanism is required.

Therefore, there is a problem that the mechanism is complicated and takes up space. Furthermore, the movable parts, namely the drive shaft 7, the disk 9,
There is also a problem that noise is generated from the driving unit 19 and the life of these components is short.

(2) Since the DC motor 1 uses a brush to supply power to the coil, there is a problem that noise is generated mechanically and radio wave interference is generated electrically. Further, there is a problem that the life is short.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a compact blood pressure monitor pump. A second object is to provide a blood pressure monitor pump having a long life.

A third object is to provide a low-noise sphygmomanometer pump. A fourth object is to provide a sphygmomanometer pump that does not cause radio interference.

[0015]

According to a first aspect of the present invention, there is provided a sphygmomanometer pump having a pump having a diaphragm, an intake valve, and an exhaust valve, and driving means for oscillating the diaphragm. A sphygmomanometer pump characterized in that a linear DC motor is used as the driving means.

As a driving means for driving the diaphragm,
The use of the linear DC motor eliminates the need for a mechanism for changing the rotational movement required for the conventional blood pressure pump into a linear movement, thereby reducing the size.

Since a linear DC motor does not use a brush, and there is no mechanism for changing a rotary motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

According to a second aspect of the present invention, there is provided the blood pressure monitor pump according to the first aspect, wherein the linear DC motor is a moving magnet type linear DC motor.

The use of the moving magnet type linear DC motor facilitates power supply to the coil. A third aspect of the present invention is a pump for a sphygmomanometer, wherein the linear DC motor according to the first aspect of the present invention is a moving coil type linear DC motor.

Since the movable element (movable part) is light, power consumption is reduced and responsiveness is good. According to a fourth aspect of the present invention, there is provided the blood pressure monitor pump, wherein the linear DC motor according to any one of the first to third aspects includes a drive circuit including an oscillator.

By incorporating a drive circuit including an oscillator in a linear DC motor, the connection can be simplified as compared with a case where a linear DC motor and a drive circuit are separately provided.
Shielding against noise is also facilitated.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (1) First Embodiment An example will be described with reference to FIGS.

As shown in FIG. 1, the sphygmomanometer pump of the present embodiment is roughly divided into a pump section 101 and a linear DC motor section 201. First, the pump unit 10
1 will be described. The lid 1 is placed on the open upper surface of the pump case 103 so as to sandwich the periphery of the diaphragm 105.
07 is attached using a screw 109.

A spindle holder 111 is fixed to the center of the diaphragm 105. At the center of the lid 107, a cylindrical air discharge port 113 is formed. Further, the lid 107 is formed with a small hole 117 and, in the vicinity of the small hole 117, three intake ports 115 which are substantially concentric with the small hole 117 as a center.

The small hole 117 is provided with an intake valve 119 made of an elastic material such as rubber. As shown in FIG. 3, the intake valve 119 presses against the inner wall surface of the lid 107, and
And a bulge portion 119a for closing the
A neck portion 119b extending through the small hole 117 and extending to the outside,
Provided on the neck 119b, abuts against the outer wall surface of the lid 107,
It comprises a retaining portion 119c for retaining the intake valve 119 from the small hole 117.

An air outlet 113 is provided on the inner wall surface of the lid 107.
An exhaust valve plate 121 that closes off is mounted via an O-ring 123. The exhaust valve plate 121 is formed with a small hole 125 and three exhaust ports 127 in the vicinity of the small hole 125 in a substantially concentric shape centered on the small hole 125.

An exhaust valve 129 made of an elastic material such as rubber is provided in the small hole 125. Since the structure of the exhaust valve 129 is the same as that of the intake valve 119, the description is omitted. next,
The linear DC motor unit 201 will be described.

Coil 205, 207 is provided on the inner wall surface of motor case 203, which is attached to pump case 103 and has a bottomed cylindrical shape with an open lower surface. In the present embodiment, a material having a high magnetic permeability is selected for the material of the motor case 203.

A hole 209 is provided on the upper surface of the motor case 203.
The bearing 213 for holding the bearing 211 is attached to the hole 209.
The spindle 215 having one end attached to the spindle holder 111 is held by a bearing 211 so as to be able to move linearly (in the directions of arrows A and B).

A cylindrical yoke 21 having a bottom and an open upper surface.
9, a hole 221 is provided in the lower surface, and a spindle holder 217 attached to the other end of the spindle 215 is fitted in the hole 221. The yoke 219 and the spindle 215 are integrally formed with an arrow. It can move linearly in the directions A and B, and this movement is transmitted to the diaphragm 105.

Further, a coil spring 225 is arranged between the spindle holder 111 and the bearing 211 so as to wind the spindle 215, and the coil spring 225 is wound between the spindle holder 217 and the bearing 211. Coil spring 2 arranged to be
27 are arranged.

On the outer peripheral surface of the yoke 219, cylindrical magnets 231 and 233 whose magnetization directions are radial are provided with coils 205 and 2.
07 is provided. Therefore, magnet 2
31 → coil 205 → motor case 203 → coil 20
A moving magnet type linear DC motor having a magnetic circuit of 7 → magnet 233 → yoke 219 → magnet 231 is formed.

A drive circuit 251 for supplying a drive current to the coils 205 and 207 and a cover 2 for closing the open surface of the motor case 203 are provided on the lower surface side, which is the open surface of the motor case 203.
41 are provided.

As shown in FIG. 4, the drive circuit 251 of this embodiment comprises an astable multivibrator (oscillation circuit) 261 and a drive transistor 263.
A pulse current (on / off current) of 100 Hz or less was supplied to the coils 205 and 207.

Note that an oscillator circuit using an IC such as an OP amplifier or a comparator may be used as the drive circuit. Furthermore, although the drive circuit having the above configuration outputs an on / off pulse current, the drive circuit may be an alternating current (a current in which positive and negative currents alternately flow), or may have a square wave or a sine wave.

Next, the operation of the sphygmomanometer pump having the above configuration will be described with reference to FIG. The drive circuit 251 supplies the coil 20
A pulse current is supplied to 5,207. When the current is on, the yoke 219, the spindle holder 217, the magnet 23
1. The magnet 233 and the spindle 215 move in the direction of arrow A. At this time, when the coil spring 225 is compressed and the current is turned off, the yoke 219, the spindle holder 217, the magnet 23
1, 233 and the spindle 215 move in the direction of arrow B and return to the original position.

The yoke 219 and the spindle holder 21
7. The reciprocating motion of the magnet 231, the magnet 233, and the spindle 215 is performed while the pulse current is supplied. Yoke 219, spindle holder 217, magnet 231, magnet 23
3. As the spindle 215 reciprocates, the diaphragm 105 oscillates.

When the yoke 219, the spindle holder 217, the magnet 231, the magnet 233, and the spindle 215 move in the direction of arrow B, the pressure in the diaphragm 105 decreases.
Then, the neck 119b of the intake valve 119 extends, and the bulk 1
The pressing contact between the cover 19a and the lid 107 is released, and outside air enters the diaphragm 105 from the intake port 115.

When the yoke 219, spindle holder 217, magnet 231, magnet 233, and spindle 215 move in the direction of arrow A, the pressure in the diaphragm 105 increases.
Then, the neck of the exhaust valve 129 is extended, and the bulk and the lid 107 are extended.
Is released, and the air in the diaphragm 105 flows out from the exhaust port 127 and the air discharge port 113 connected thereto.

According to the above configuration, since the linear DC motor is used as the driving means for driving the diaphragm 105, a mechanism for changing the rotary motion required for the conventional blood pressure pump into a linear motion is not required, and the compactness is achieved. Becomes

Since the linear DC motor does not use a brush, and there is no mechanism for changing the rotary motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

The transmission circuit 261 is provided in the linear DC motor.
By incorporating the drive circuit 251 having the above structure, the connection can be simplified and the shielding against noise can be facilitated as compared with the case where the linear DC motor and the drive circuit are separately provided.

Further, in this embodiment, the power supply to the coils 205 and 207 is facilitated by using a moving magnet type linear DC motor. (2) Second Embodiment A second embodiment will be described with reference to FIGS.
The difference between the present embodiment and the first embodiment is the exhaust valve, and other parts are the same as those of the first embodiment. The same parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals, and redundant description will be omitted.

As shown in FIG. 5, a screw 303 is used to cover the lid
05 is attached. A rubber tube 307 is provided on the outer tube surface of the tube member 305 to press against the outer tube surface.

As shown in FIG. 6, a discharge port 309 is formed on the outer cylinder surface of the cylinder member 305. The operation of such a configuration will be described. When the yoke 219, the spindle holder 217, the magnet 231, the magnet 233, and the spindle 215 move in the arrow A direction, the pressure in the diaphragm 105 increases.

Then, the cylindrical member 30 of the rubber tube 307
The pressing contact with the outer peripheral surface of the diaphragm 5 is released, and the air in the diaphragm 105 flows out from the gap between the rubber tube 307 and the cylindrical member 305.

In the above configuration, the same effect as in the first embodiment can be obtained. Note that the exhaust valve is not limited to the above embodiment. For example, as shown in FIG.
5, a rubber plate 359 for sealing the exhaust port 357 may be provided on the other end of the leaf spring 355.

(3) Third Embodiment A third embodiment will be described with reference to FIG. The difference between the present embodiment and the first embodiment is a linear DC motor section, and the other portions are the same as those of the first embodiment. 1 to 4 showing examples
The same parts as those described above are denoted by the same reference numerals, and redundant description will be omitted.

A ring-shaped magnet 401 whose magnetization direction is the thickness direction is provided on the inner wall surface of the motor case 203 of the linear DC motor section 400. A substantially cylindrical yoke 403 is attached to the hole 209 of the motor case 203.

A spindle 2 is provided on the inner periphery of the yoke 403.
A bearing 405 is provided for holding the motor 15 in a direction indicated by arrows A and B so as to be able to move linearly. Further, between the spindle holder 111 and the bearing 405, a coil spring 411 arranged so as to wind the spindle 215 is provided between the spindle holder 217 and the bearing 405.
A coil spring 413 arranged so as to wind the spindle 215 is disposed between the coil spring 413 and the coil spring 413.

The spindle holder 217 has a yoke 40
3 is disposed in the space between the magnet 401 and the cylindrical bobbin 423 around which the coil 421 facing the magnet 401 is wound.
Is provided.

Therefore, a moving coil type linear DC motor having a magnetic circuit of magnet 401 → coil 421 → yoke 403 → motor case 203 → magnet 401 is formed.

Next, the operation of the sphygmomanometer pump having the above configuration will be described with reference to FIG. Coil 42 from drive circuit 251
1 is supplied with a pulse current. When the current is on, the coil 421, bobbin 423, bobbin holder 425, spindle holder 42
5. The spindle 215 moves in the direction of arrow A. At this time,
When the coil spring 411 is compressed and the current is turned off, the coil 421, bobbin 423, bobbin holder 425, spindle holder 425, and spindle 215 move in the direction of arrow B due to the elastic repulsion of the coil spring 411,
Return to the original position.

The coil 421, bobbin 423, bobbin holder 425, spindle holder 425, spindle 215
Is performed while the pulse current is supplied. Coil 421, bobbin 423, bobbin holder 425,
As the spindle holder 425 and the spindle 215 reciprocate, the diaphragm 105 oscillates and air is discharged from the air discharge port 113.

According to the above configuration, since the linear DC motor is used as the driving means for driving the diaphragm 105, a mechanism for changing the rotary motion required for the conventional blood pressure pump into a linear motion is not required, and the compactness is achieved. Becomes

Since the linear DC motor does not use a brush, and there is no mechanism for changing the rotary motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

The transmission circuit 261 is provided in the linear DC motor.
By incorporating the drive circuit 251 having the above structure, the connection can be simplified and the shielding against noise can be facilitated as compared with the case where the linear DC motor and the drive circuit are separately provided.

Furthermore, in the present embodiment, the moving element (movable part: coil 421, bobbin 423, bobbin holder 425,
Since the weight of the spindle holder 425 and the spindle 215) is reduced, power consumption is reduced and responsiveness is improved.

(4) Fourth Embodiment A fourth embodiment will be described with reference to FIG. The difference between the present embodiment and the first embodiment is a linear DC motor section, and the other portions are the same as those of the first embodiment. 1 to 4 showing examples
The same parts as those described above are denoted by the same reference numerals, and redundant description will be omitted.

A cylindrical magnet 501 whose magnetization direction is a radial direction is provided on the inner wall surface of the motor case 203 of the linear DC motor section 500. An upper yoke 505 having a through hole 503 into which the spindle 215 is loosely inserted is provided above the magnet 501. This upper yoke 50
Reference numeral 5 includes a disk portion 507 connected to the inner wall surface of the motor case 203, and a cylindrical portion 509 connected to the disk portion 507.

An upper yoke 505 is provided below the magnet 501.
A lower yoke 515 on a disk having a through hole 513 into which the cylindrical portion 509 is loosely inserted is provided. An upper damper 523 is provided above the upper yoke 505 via an annular damper bracket 521 provided on the inner wall surface of the motor case 203.

A lower damper 533 is provided below the lower yoke 515 via an annular damper bracket 531 provided on the inner wall surface of the motor case 203.
Spindle holders 525 and 535 fixed to the spindle 215 are attached to the center portions of the upper damper 523 and the lower damper 533, respectively.

Accordingly, the spindle 215 can be moved substantially linearly in the directions of arrows A and B. Further, the cylindrical portion 50 of the upper yoke 505 is attached to the spindle holder 535.
9 and the coil 5 disposed in the space between the lower yoke 515
A cylindrical bobbin 543 around which 41 is wound is provided.

Therefore, the magnet 501 → the lower yoke 515 →
A moving coil type linear DC motor having a magnetic circuit consisting of a coil 541 → a cylindrical portion 509 of the upper yoke 505 → a disk portion 507 of the upper yoke 505 → a magnet 501 is formed.

Next, the operation of the sphygmomanometer pump having the above configuration will be described with reference to FIG. Coil 54 from drive circuit 251
1 is supplied with a pulse current. When the current is on, the coil 541, bobbin 543, spindle holder 535, spindle 215
Moves in the direction of arrow A. At this time, when the upper damper 523 and the lower damper 533 are deformed upward and the current is turned off,
The coil 541, the bobbin 543, and the spindle holder 53 are generated by the elastic repulsion of the upper damper 523 and the lower damper 533.
5. The spindle 215 moves in the direction of arrow B and returns to the original position.

The reciprocation of the coil 541, bobbin 543, spindle holder 535, and spindle 215 is performed while the pulse current is supplied. Coil 541, bobbin 543, spindle holder 535, spindle 215
Reciprocates, the diaphragm 105 oscillates, and air is discharged from the air discharge port 113.

According to the above configuration, since a linear DC motor is used as the driving means for driving the diaphragm 105, a mechanism for changing the rotary motion required for the conventional blood pressure pump into a linear motion is not required, and the compactness is achieved. Becomes

Since the linear DC motor does not use a brush, and there is no mechanism for changing the rotary motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

The transmission circuit 261 is provided in the linear DC motor.
By incorporating the drive circuit 251 having the above structure, the connection can be simplified and the shielding against noise can be facilitated as compared with the case where the linear DC motor and the drive circuit are separately provided.

Furthermore, in the present embodiment, the moving element (movable part: coil 421, bobbin 423, bobbin holder 425, bobbin holder 425,
Since the weight of the spindle holder 425 and the spindle 215) is reduced, power consumption is reduced and responsiveness is improved.

(5) Fifth Embodiment A fifth embodiment will be described with reference to FIG. The difference between the present embodiment and the fourth embodiment is the difference in the number of dampers of the linear DC motor unit, and the other parts are the same as in the fourth embodiment. The same parts as those in FIG. 8 showing the fourth embodiment are denoted by the same reference numerals, and redundant description will be omitted.

On the inner wall surface of the motor case 203 of the linear DC motor unit 600, a ring-shaped magnet 601 whose magnetization direction is the thickness direction is provided. At the bottom of the magnet 601,
A lower yoke 605 is provided. This lower yoke 6
Numeral 05 includes a disk portion 607 connected to the inner wall surface of the motor case 203 and a cylindrical portion 609 connected to the disk portion 607.

A lower yoke 605 is provided above the magnet 601.
An upper yoke 615 on a disk having a through hole 613 into which the cylindrical portion 609 is loosely inserted is provided. Above the upper yoke 615, a damper 623 is provided via an annular damper bracket 621 provided on the inner wall surface of the motor case 203.

At the center of the damper 623, the spindle 6
02 is attached to a spindle holder 625 fixed thereto. Therefore, the spindle 602 moves in the direction of arrow A,
It can be moved substantially linearly in the B direction.

Further, the spindle holder 625 has a cylindrical bobbin 64 in which a coil 641 is wound and disposed in a space between the cylindrical portion 609 of the lower yoke 605 and the magnet 601.
3 are provided.

Therefore, the magnet 601 → the lower yoke 605 →
A moving coil type linear DC motor having a magnetic circuit of a coil 641 → an upper yoke 615 → a magnet 601 is formed.

Next, the operation of the sphygmomanometer pump having the above configuration will be described with reference to FIG. Coil 6 from drive circuit 251
A pulse current is supplied to 41. When the current is on, the propulsive force generated in the coil 641 causes the coils 641,
Bobbin 643, spindle holder 625, spindle 60
2 moves in the direction of arrow A. At this time, when the damper 623 is deformed upward and the current is turned off, the coil 641, the bobbin 643, the spindle holder 625, and the spindle 602 move in the arrow B direction due to the elastic repulsive force of the damper 623, and return to the original position.

The reciprocation of the coil 641, the bobbin 643, the spindle holder 625, and the spindle 602 is performed while the pulse current is supplied. Coil 641, bobbin 643, spindle holder 625, spindle 602
Reciprocates, the diaphragm 105 oscillates, and air is discharged from the air discharge port 113.

According to the above configuration, since the linear DC motor is used as the driving means for driving the diaphragm 105, a mechanism for changing the rotary motion required for the conventional blood pressure pump into a linear motion is not required, and the device is compact. Becomes

Since the linear DC motor does not use a brush, and there is no mechanism for changing the rotational motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

The transmission circuit 261 is provided in the linear DC motor.
By incorporating the drive circuit 251 having the above structure, the connection can be simplified and the shielding against noise can be facilitated as compared with the case where the linear DC motor and the drive circuit are separately provided.

Further, in this embodiment, the moving element (moving part: coil 641, bobbin 643, spindle holder 6) is provided by using a moving coil type linear DC motor.
25, the spindle 602) is lightweight, so that power consumption is reduced and responsiveness is good.

In the fourth embodiment, two dampers are used.
The use of one damper is suitable for a small amplitude, and the fifth embodiment is suitable for a small amplitude and a small load by using one damper.

[0084]

As described above, according to the first aspect of the present invention, since the linear DC motor is used as the driving means for driving the diaphragm, the rotational movement required by the conventional blood pressure pump is achieved. This eliminates the need for a mechanism for converting the motion into a linear motion, resulting in compactness.

Since the linear DC motor does not use a brush, and there is no mechanism for changing the rotary motion into a linear motion,
Long life and low noise. Since the linear DC motor does not use a brush, no radio interference occurs.

According to the second aspect of the present invention, the power supply to the coil is facilitated by using the moving magnet type linear DC motor. According to the third aspect of the invention, the weight of the movable element (movable part) is reduced, so that power consumption is reduced and responsiveness is good.

According to the fourth aspect of the present invention, the linear DC motor incorporates a drive circuit including an oscillator, thereby simplifying the connection as compared with a case where the linear DC motor and the drive circuit are separately provided. This makes it easier to shield against noise.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a first embodiment.

FIG. 2 is a top view of FIG.

FIG. 3 is an enlarged view of an exhaust valve portion of FIG.

FIG. 4 is a diagram illustrating an example of a driving circuit of FIG. 1;

FIG. 5 is a cross-sectional view illustrating a second embodiment.

FIG. 6 is an enlarged view of an exhaust valve portion of FIG. 2;

FIG. 7 is an explanatory diagram of another embodiment.

FIG. 8 is a cross-sectional view illustrating a third embodiment.

FIG. 9 is a cross-sectional view illustrating a fourth embodiment.

FIG. 10 is a cross-sectional view illustrating a fifth embodiment.

11 is a cross-sectional view taken along a cutting line AA in FIG. 12 of a main part of a conventional blood pressure monitor pump.

FIG. 12 is a top view of FIG. 11;

[Explanation of symbols]

 105 Diaphragm 119 Intake valve 129 Exhaust valve 201 Linear DC motor

Claims (4)

[Claims] 1. A sphygmomanometer pump having a pump having a diaphragm, an intake valve, and an exhaust valve, and a driving means for oscillating the diaphragm, wherein a linear DC motor is used as the driving means. Sphygmomanometer pump. 2. The sphygmomanometer pump according to claim 1, wherein the linear DC motor is a moving magnet type linear DC motor. 3. The sphygmomanometer pump according to claim 1, wherein the linear DC motor is a moving coil type linear DC motor. 4. The sphygmomanometer pump according to claim 1, wherein the linear DC motor includes a drive circuit including an oscillator.