JPH0523146B2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to improvements in blood pressure measuring devices.

<Prior Art> A method shown in FIG. 16 is generally used as a method for reducing the pressure inside a manifold at a constant speed in a blood pressure measuring device. This is solenoid 10
1 to drive a valve body 102 to open and close a nozzle opening 103 communicating with a manifold (not shown), thereby controlling the pressure inside the manifold. The pressure inside the apartment is
As shown in FIG. 7, this is performed by a diaphragm pump 105 driven by a motor 104.

<Problems to be Solved by the Invention> Conventionally, a solenoid is used as a drive source to reduce the pressure in the manifold, and a motor is used as a drive source to pressurize the manifold. Therefore, since dedicated drive sources are required for depressurization and pressurization, there is a problem in that the device becomes larger and costs increase.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a blood pressure measuring device that can be made smaller and less expensive, and can also provide highly reliable measurements.

<Means for Solving the Problems> The blood pressure measuring device of the present invention will be described with reference to FIG. 3 corresponding to the embodiment. A pressure reducing actuator 1 for reducing the pressure, a motor 4 common to the diaphragm pump 2 and the pressure reducing actuator 1, and a coupling device 3 for selectively connecting the diaphragm pump 2 and the pressure reducing actuator 1 to the motor 4. The coupling device 3 is characterized by comprising a coupling A that moves the pressure reducing actuator 1 in accordance with the drive of the motor 4, and a coupling B that drives and controls the diaphragm pump 2.

<Function> In the blood pressure measuring device of the present invention, a diaphragm pump 2 for pressurizing the inside of the manifold and a pressure reducing actuator 1 for reducing the pressure inside the manifold are selectively connected to a motor 4 by a coupling device 3.

In addition, when pressurizing, when the motor 4 is rotated counterclockwise, the coupling B and the rotating shaft 22 are connected to each other as shown in FIG. As shown, the pressure reducing actuator 1 moves in the direction of closing the nozzle 18, and the air inside the apartment is fed and pressurized.

On the other hand, when the pressure is reduced, when the motor 4 is rotated clockwise, the coupling B is rotated as shown in FIG.
Then, the motor rotation shaft 22 becomes separated, the coupling B does not rotate, and no driving force is transmitted. Fifth
As shown in the figure, during depressurization, the depressurizing actuator 1 moves in the opposite direction to that when pressurizing, the nozzle 18 moves away from the closed surface 17c, and air flows out from between the nozzle 18 and the tapered hole 17a. , the pressure inside the apartment will be reduced. At this time, the flow rate of the exhaust gas can be adjusted by adjusting the distance between the nozzle 18 and the tapered hole 17a.

<Example> FIG. 3 shows the external configuration of a blood pressure measuring device of this example. The underframe 14 includes a pressure reducing actuator 1,
A diaphragm pump 2, a coupling device 3, a motor 4, and pipe lines 12 and 13 communicating with a not-shown pump are provided.

The coupling device 3 is composed of two couplings A and B. The cylindrical surface of the coupling A is formed of a rubber film 15, and this rubber film 15 is in pressurized contact with the bottom surface of the pressure reducing actuator 1. The coupling ring B has an eccentric shaft 16 fixed to its end face. Cup ring B
When the diaphragm pump 2 rotates, the eccentric shaft 16 pushes the operating rod of the diaphragm pump 2, thereby operating the diaphragm pump 2. Coupling A and coupling B are coupled together when the motor 4 rotates in the normal direction to pressurize the manifold, and are separated from each other when the manifold is depressurized by the motor 4 repeating forward and reverse rotations.
The pressure reducing actuator 1 is comprised of a movable sheath 17 and a nozzle 18, as shown in FIG.
The movable sheath 17 has a tapered hole 17 closed on the right side in the figure.
a, and a nozzle 18 is fitted into this tapered hole 17a. The other end of the nozzle 18 communicates with the manifold. The bottom surface 17b of the movable sheath 17 is in contact with the rubber membrane 15 of the coupling A as described above, and when the coupling A rotates, the rubber membrane 1
The movable sheath 17 moves due to friction with the sheath 5. Fourth
The figure shows the state of the manchette when it is pressurized.
7c is in contact with the nozzle 18, and the nozzle 18 is in a closed state.
When the pressure is reduced in the manifold, the movable sheath 17 moves to the right in the figure, and as shown in FIG.
The opening 18a of No. 8 is separated from the closed surface 17c. Therefore, air flows out from the opening 18a of the nozzle 18 and exits outside through the gap between the nozzle 18 and the tapered hole 17a.

FIG. 1 shows the block configuration of this blood pressure measuring device. In the figure, 1 is a pressure reducing actuator, 2 is a diaphragm pump, 3 is a coupling device, 4 is a motor, 5 is a pump, 6 is a pressure sensor, 7 is a comparator, and 8 is a gradient setting circuit. Furthermore, in the figure, an arrow 9 indicated by a double solid line indicates the direction in which air, which is a pressure medium, flows, and an arrow 1 indicated by a single solid line
0 indicates the direction of transmission of the driving force, and the dashed arrow 11 indicates the direction of the electrical control signal.

A pressure sensor 6 detects the pressure inside the passenger compartment 5. The gradient setting circuit 8 outputs a pressure P setting signal having a relationship with time t as shown in FIG. The comparator 7 compares the actual pressure inside the passenger compartment 5 detected by the pressure sensor 6 with the gradient setting circuit 8.
A control signal is given to the motor 4 so that the pressure inside the manifold decreases linearly with the set value of the gradient setting circuit 8, that is, with the passage of time, in accordance with the result of this comparison. .

To explain the operation procedure, first, when applying pressure,
The coupling 3 transmits the driving force of the motor 4 to the diaphragm pump 2, and the inside of the passenger compartment 5 is pressurized by driving the diaphragm pump 2. During pressure reduction, the coupling 3 transmits the driving force of the motor 4 to the pressure reduction actuator 1, and the motor 4 is controlled according to the detection of the pressure sensor 6 and the output of the comparator 7.
The air inside the apartment 5 is exhausted. In this case, when there is a difference between the output of the gradient setting circuit 8 and the output of the pressure sensor 6, the motor 4 is driven so that the difference becomes zero, that is, the pressure in the manifold 5 follows the output of the gradient setting circuit 8. Then, the pressure reducing actuator 1 is controlled.

FIG. 6 shows the detailed structure of the coupling B.
In the figure, 21 is the main body of the coupling B, 22 is the motor rotation shaft, 23 and 24 are spheres, 25 is a disk portion, and 26
is a diaphragm pump.

The main body 21 of the coupling B has a hole 2 in its center.
7, and the motor rotating shaft 22 passes through this hole 27. The hole 27 consists of a cylindrical portion 27a through which the motor rotation shaft 22 passes, and two notches 27b and 27c that are continuous with the cylindrical portion 27a and are axially symmetrical with respect to the cylindrical portion 27a. Notch 27
b and 27c are each narrower at the end in the counterclockwise direction in the figure, and wider at the opposite end. The notches 27b and 27c have the spheres 23 and 24.
are included in each. A disk portion 25 is joined to the coupling B main body 21 so as to cover the hole 27. A rod 28 is fixed to the disk portion 25 at an eccentric position. This rod body 28 engages with an operating rod 29 of the diaphragm pump 26 . The motor shaft 22 is directly connected to a coupling A (not shown).

The operation of this coupling B will be explained below.

When motor 4 is rotating counterclockwise,
As shown in FIG. 7, the spheres 23 and 24 are fitted into the narrow ends of the notches 27b and 27c by the bias of the motor rotation shaft 22, and the motor rotation shaft 22 and the coupling B main body 21 are connected. become a state. Therefore, as the motor rotation shaft 22 rotates counterclockwise, the coupling B main body 21 also rotates counterclockwise. Due to the rotation of the coupling B main body 21,
As shown in FIGS. 9 and 10, the diaphragm pump 26 that engages with the rod 28 is driven to supply air to the passenger compartment 5.

On the other hand, when the motor 4 rotates clockwise, the fitting between the spheres 23 and 24 and the notches 27b and 27c is released, and as shown in FIG. 8, the spheres 23 and 24 are free in the notches 27b and 27c. become. In this state, the motor rotation shaft 22 and the coupling B main body 21 are separated from each other, and the coupling B main body 21 does not rotate regardless of the rotation of the motor 4.

Although not shown in FIG. 6, the coupling A is directly connected to the motor rotating shaft 22, and the rubber film on its peripheral surface contacts the pressure reducing actuator. Then, when reducing the pressure in the passenger compartment 5, the motor 4
repeats clockwise and counterclockwise rotation, and the pressure reducing actuator 1, which comes into frictional contact with the coupling A, operates. However, the rotation angle of the motor 4 at this time is equal to the notch 27 of the coupling B main body 21.
Since it is smaller than the width of the spheres 23 and 24
does not fit between the notches 27b, 27c and the motor rotating shaft 22, and therefore the coupling B main body 21
does not rotate. When the pressure reducing actuator 1 is pressurizing the manifold 5, the tip of the nozzle 18 comes into contact with the closed surface 17c of the movable sheath 17, as shown in FIG. When blocked, the coupling A slips while remaining in contact with the underside of the movable sheath 17.

FIG. 11 shows another embodiment of the coupling device. In the figure, 31 is the main body of the coupling A, 32 is the main body of the coupling B, 33 is the diaphragm pump,
1 is a pressure reducing actuator. The coupling A main body 31 and the coupling B main body 32 are rotatably supported by a support member (not shown). Further, the pressure reducing actuator 1 is slidably supported by support members 35 and 36 (the support member 36 is not shown).

As shown in FIG.
Directly connected to. The circumferential surface of the coupling A main body 31 is
A rod 35 is fixed to the surface 31b formed of a rubber film 38 and facing the side having the motor rotation shaft 37 at an eccentric position in the axial direction of the coupling A main body 31. FIG. 13 shows a rod 35 in an eccentric position in the axial direction of the coupling A main body 31.
is permanently installed. FIG. 13 shows a cross-sectional structure of the coupling A main body 31.

As shown in FIG. 14, the coupling B main body 32 has a C-shaped groove 39 formed in a side surface 32a. The arc formed by this groove 39 is coaxial with the rotation axis of the coupling body B32. A rod 36 is fixed to the other side surface 32b of the coupling B main body 32 at an eccentric position in the axial direction of the coupling B main body 32.

As shown in FIG. 11, the coupling A main body 3
1's rubber membrane 38 contacts the lower surface of the pressure reducing actuator, the rod 35 of the coupling A main body 31 fits into the groove 39 of the coupling B main body 32, and the rod 36 of the coupling B main body 32 operates the diaphragm pump 33. Engages with rod 40.

When pressurizing the manifold 5, the motor 4 rotates counterclockwise, thereby rotating the coupling A main body 31 counterclockwise. Due to this rotation of the coupling A main body 31, the rod 35 moves within the groove 39 of the coupling B main body 32, and the rod 35 moves within the groove 39 of the coupling B main body 32.
When the rod 35 comes into contact with the end of the groove 39, the rod 35
The coupling B main body 32 rotates counterclockwise due to the pressure. The rotation of the coupling B main body 32 drives the diaphragm pump 33 engaged with the rod 36, and air is sent to the passenger compartment 5. At this time, the coupling A main body 31 is slipping on the bottom surface of the pressure reducing actuator 1.

On the other hand, when reducing the pressure in the passenger compartment 5, the motor 4
rotates clockwise and counterclockwise alternately in response to the output signal of the comparator 7, and therefore the coupling A main body 31 repeats rotations clockwise and counterclockwise. Coupling A main body 31 at this time
The rotation angle of the rod 3 of the coupling A main body 31 is
5 is within the angle range in which the groove 39 of the coupling B main body 32 can be moved, so the coupling B main body 32 does not rotate. Therefore, diaphragm pump 33 is not driven. On the other hand, as the coupling A main body 31 rotates clockwise and counterclockwise, the pressure reducing actuator 1 that is in frictional contact moves back and forth, and the relative position between the nozzle and the movable sheath changes, so that the air inside the manifold 5 is gradually removed. is exhausted.

FIG. 15 shows another embodiment of the pressure reducing actuator. It consists of a thin tube 52 that is continuous with a conduit 51 that communicates with a passenger compartment (not shown), and a movable tube 53 that moves along the thin tube 52 inside and outside of this thin tube 52. The movable tube 53 moves in the direction of arrow X in the figure due to the rotation of the main body of the coupling A. By this movement of the movable tube 53, the thin tube 52 and the movable tube 53
The flow rate of exhaust gas is adjusted by changing the distance between the air gap and the air resistance.

<Effects of the Invention> As explained above, in the present invention, the diaphragm pump and the pressure reducing actuator are selectively driven by a common drive source through the operation of the coupling device. The blood pressure measuring device can be made smaller and lower in price.

Furthermore, by changing the distance between the nozzle and the tapered hole that make up the decompression actuator and changing the air resistance, the exhaust flow rate can be adjusted, making it possible to make delicate adjustments and achieve reliability. It is possible to achieve highly accurate measurements.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram showing output changes of the gradient setting circuit of the embodiment of the present invention, and FIG. 3 is a perspective view showing the external structure of the embodiment of the present invention. 4 and 5 are diagrams showing the cross-sectional structure of the pressure reducing actuator according to the embodiment of the present invention, and FIG.
The figure shows the configuration of the first embodiment of the coupling device used in the present invention, and FIGS. 11 is a diagram showing the configuration of a second embodiment of the coupling device used in the present invention, and FIG.
13 and 14 are diagrams showing a partial structure of a coupling device according to a second embodiment, FIG. 15 is a diagram showing a cross-sectional structure of a second embodiment of a pressure reducing actuator according to an embodiment of the present invention, and FIG. This figure and FIG. 17 are diagrams showing the structure of a conventional example. DESCRIPTION OF SYMBOLS 1... Actuator for pressure reduction, 2... Diaphragm pump, 3... Coupling device, 4... Motor, 5... Mansion, 6... Pressure sensor,
7... Comparator, 8... Gradient setting circuit.

Claims (1)

[Claims] 1 A diaphragm pump that pressurizes the inside of the manifold, a depressurization actuator that depressurizes the inside of the manifold at a constant rate, a drive source common to the diaphragm pump and the depressurization actuator, and a diaphragm pump and the actuator that are connected to the A coupling device selectively connected to a drive power source, the coupling device including a first coupling that moves the pressure reducing actuator in response to driving of the drive source, and a first coupling device that drives the diaphragm pump. A blood pressure measuring device comprising: a controlling second coupling;