JPH01265940A - Electronic tonometer - Google Patents

Abstract

PURPOSE:To have sure restart of a pump, i.e. a motor, even though the internal pressure of a pump chamber has risen, by furnishing a micro-amount exhaust means which allows the pressurized medium in a pressurized medium chamber to leak to the outside a in micro-amount. CONSTITUTION:A diaphragm 1 is driven by a motor to cause the pressurized medium to flow to a pressure accumulator part from a pressurized medium chamber 14. Check valves 19, 20 consolidated with this diaphragm 1 are installed at a discharge hole 17 and a suction hole 18 in communication with this pressurized medium chamber 14. A micro-boss 31 as a micro-amount exhaust means is formed in this suction hole 18 so that the pressurized medium in micro-amount leaks from the pressurized medium chamber 14 to the check valve 19 at all times through the gap between this boss 31 and the check valve 19. Accordingly the pressurized medium leaks to outside if the pressurized medium chamber 14 is under high pressure at the time pressurization is finished, and thus the pressure in the chamber 14 is sunk.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention relates to an electronic blood pressure monitor equipped with an electric pressure pump.

[Prior art] In conventional automatic pressurization type electronic blood pressure monitors, which stop the pump when the pressure setting value is reached, check whether the pressure is insufficient, and automatically re-pressurize the blood pressure monitor if the pressure is insufficient. It has the following problems. In other words, when the internal pressure of the cuff becomes high, there is a delay in the opening and closing of the discharge valve made of rubber or the like compared to the reciprocating movement of the operating member, so the high-pressure medium in the cuff band flows back through the discharge hole. When the internal pressure in the pump chamber increases and the pump is restarted, the pump must overcome the internal pressure in the pump chamber to drive the pump, which increases the load on the motor. Therefore, if the motor is controlled in the same way as when the pressure is low, the motor may not restart due to insufficient torque, causing heat generation and
There is a problem of shortened lifespan and, in the case of battery-powered devices, battery consumption.

In addition, when using an automatic pressurization type, if a person with high blood pressure or external vibration is mixed in when determining insufficient pressure, the pressure inside the cuff band may increase abnormally due to repeated pressurization. At the time of abnormal pressure increase (for example, 320 mm)-1 g), a mechanism is required to rapidly exhaust the air within the cuff band. In the 6th year of the Tokuko Showa era, this rapid exhaust mechanism used a device that operated the rapid exhaust valve by reversing the pump motor.
It is described in Japanese Patent No. 0-40293. In this case, rapid evacuation is performed by reversing the motor, so the cuff ? i? The motor may not start due to insufficient torque due to high internal pressure.

The above two conventional problems occur depending on the motor's rated torque even when the motor is driven by AC. If a high-torque motor is used with such problems in mind, there will be problems with noise and fR power consumption.

Furthermore, in the case of a battery-powered device, this problem is particularly likely to occur when the battery is exhausted.

[Problem to be Solved by the Invention 1] The present invention has been provided in view of the above-mentioned points, and it is possible to prevent re-pressurization or abnormal operation when pressurizing the cuff band even when the internal pressure of the pump is high. The present invention provides an electronic blood pressure monitor that is capable of reliably restarting a motor for rapid exhaustion.

[Means for Solving the Problems 1] [Function 1] The present invention provides a micro discharge means for leaking a small amount of pressurized medium in the pressurized medium chamber to the outside, so that the micro discharge means can constantly apply pressure when the motor is stopped. The pressurized medium in the pressurized medium chamber is leaked in a small amount to make the pressure in the pressurized medium chamber approximately the same as the external pressure, thereby ensuring restart of the motor.

[Example 1] Hereinafter, an example of the present invention will be described with reference to the drawings. Here, the pressurized medium usually refers to air, but is not limited thereto.

tp11 to FIG. 3 show a first embodiment in which the pressurizing pump of the present invention is of a diaphragm type and is used in a blood pressure monitor. As shown in the figure, this diaphragm pump includes a diaphragm 1, which is an operating member, and a discharge hole 2.
, a valve (hereinafter referred to as "discharge valve I") 3, and operation transmission means 4.

The diaphragm 1 is driven by the rotation of the motor 5,
A pressurized medium flows from the pressurized medium chamber 14 into a urine storage section (not shown). The discharge hole 2 is for discharging the pressurized medium from the urine storage section. In this embodiment, the discharge hole 2 is made of rubber, but it may be made of other materials.

The discharge valve 3 is rotatably supported by a rotation shaft 6, and opens and opens the discharge hole 2 by rotation in forward and reverse directions.

The motion transmission means 4 includes a coil spring (valve spring) 7, a first protrusion 8, and a second protrusion 9. The fill spring 7 is wound around the rotating shaft 10 of the motor 5 so as to rotate together and to release the same, and has two ends, a fourteenth part 7a and a second end part 7b, which extend away from the rotating shaft 10. have. The first end 7a and the first second end 7b extend in mutually opposite directions so as to move away from the rotating shaft 10. 1st projecting piece 8 and V 2nd
The projecting piece 9 is provided on the discharge valve 3 side so as to rotate forward and backward together with the discharge valve 3, and in this embodiment, it is provided in a protruding manner at one end of the discharge valve 3 spaced apart from the rotation shaft 6. .

The motor 5 is fixed to a pump stand 11, and an eccentric shaft 12 is integrated with the tip of the rotating shaft 10 by welding or the like to form a crank.

The eccentric shaft 12 is connected to a connecting rod 131 of the diaphragm 1. Therefore, the rotational motion of the motor 5 is converted into a straight #iI motion, and the diaphragm 1 reciprocates (in the directions of arrows E and F). The method of eccentricity is not limited to the method of integrating the eccentric shaft 12 with the rotating shaft 10 of the motor 5 by welding or the like as described above, but may also be a method of bending the rotating shaft 10.

The lower part of the diaphragm 1 is a pressurized medium chamber (in this embodiment, an air chamber) 14. This pressurized medium chamber 14 is
A discharge hole 17 is used to send the pressurized medium from the hose 16 inserted through the insertion port 15 to the urine storage section (in this embodiment, the urine storage W in the cuff band of the blood pressure monitor), and a discharge hole 17 is used to suck the pressurized medium from the outside. an inlet hole (also referred to as an inlet hole in this embodiment) 18,
and a discharge hole (also referred to as an exhaust hole in this embodiment) 2 for rapidly discharging the pressurized medium in the pressure storage section. The discharge hole 17 and the suction hole 18 are provided with check valves 19 and 20 that are integrated into the diaphragm 1, so that the pressurized medium sucked from the suction hole 18 can be reliably sent to the urine storage section. It is now possible to do so. As shown in FIG. 2, a minute protrusion 31 is formed in the suction hole 18 as a minute discharge means, and a minute amount of pressurized medium is always reversed from the pressurized medium chamber 14 between it and the reverse IL valve 19. It is leaking to the stop valve. Therefore, when the pressure in the pressurized medium chamber 14 is high at the end of pressurization, the pressurized medium is leaked to the outside and serves to lower the pressure in the pressurized medium chamber 14.

Note that the check valves 19 and 20 may be provided separately from the diaphragm 1, and the discharge hole 17 and the suction hole 18 are not limited to the positions as in the embodiment, but are placed in the pressurized medium chamber, for example. 1
It may be provided on the back side of 4. Figure 4 shows suction hole 1
8 is a perspective view seen from the pressurized medium chamber 14 side of check valve 1.
A protrusion 31 is provided on the 9 side.

The high-pressure side spaces G and H are connected through an internal passage (not shown) of the pump stand 11, etc.

The discharge valve 3 is made of a plate-shaped magnetic material, and is connected to the pump stand 1.
If a permanent magnet (closed state holding magnet) 21 is provided at a position where the back side of the edge of the discharge valve 3 faces, when the discharge valve 3 is closed, the discharge valve 3 is firmly moved toward the discharge hole 2 side. The closed state is maintained by suction, and the pressurized medium does not leak from the discharge hole 2. This permanent magnet 21 has sufficient magnetic force so that the discharge valve 3 will not open due to the internal pressure unless the internal pressure of the static pressure section reaches a high pressure exceeding a predetermined pressure. Further, a permanent magnet (open state holding magnet) 22 is provided at a position where the edge surface of the discharge valve 3 faces when the discharge valve 3 is open, and holds the discharge valve 3 firmly when the discharge valve 3 is open. It will attract air to keep it open. The method for keeping the discharge valve 3 open and closed is not limited to this. The permanent magnet may be provided in the discharge valve 3, and a magnetic material may be provided in the position where the permanent magnet is provided in the figure. Further, by providing the permanent magnet only in the portion facing the discharge valve 3, it is possible to prevent negative magnetic effects on other parts.

5(d) to (fL(a)) show the details of the operation of the motion transmission means 4 when the discharge valve 3 changes from open to closed. In FIG. 5(d), the discharge valve 3 is In open state.Motor 5
When the rotating shaft 10 is rotated in one direction (in the direction of arrow A, counterclockwise in this example), the diaphragm 1 operates to cause pressurized medium (air in this example) to flow into the static pressure section.

At this time, the coil spring 7 also rotates (co-rotates) in the direction of arrow A together with the rotating shaft 10. First end fffs of coil spring 7
7a rotates approximately once and presses the first projecting piece 8 from below (FIG. 7(e)). Since the pressing force at this time is in the direction in which the coil spring 7 closes, the coil spring 7 overcomes the attractive force of the permanent magnet 22 and continues to rotate together with the rotating shaft 10.

Due to this suppression, the discharge valve 3 begins to rotate in the direction of arrow C (starts to close). When the discharge valve 3 rotates to a certain extent, the first end 7a of the coil spring 7 comes off the first protruding piece 8 (see (f) in the same figure), that is, the first protruding piece 8 moves to fIIJ1.
Rotation locus of end 7a ■ Go outside. At this time, the @2 projecting piece 9 is within the rotation locus (■) of the second end 7b, and the coil spring 7 further rotates in the direction of arrow A, so that the second end 7b
presses the second projecting piece 9 from below ((,) in the same figure), and at the same time, the discharge valve 3 also further rotates in the direction of arrow C, closing the discharge hole 2.

In this state, the discharge hole 2 which rapidly discharges the pressurized medium
is closed, so that the pressurized medium flows into the static pressure section. 4R
When the outlet valve 3 is in the closed state, the second end 7b of the fill spring 7
By pressing the ttIJ2 projecting piece 9, a reaction is exerted in the direction of loosening the fill spring 7, so that the rotation is canceled and the rotating shaft 10 is allowed to rotate. Therefore, even if the coil spring 7 is prevented from rotating, the rotating shaft 10 of the motor 5 continues to rotate in the direction of arrow A.

FIGS. 5(a) to 5(d) show details of the operation of the motion transmitting means 4 when changing from closed to open. In the same figure (a), the discharge valve 3 is in a closed state. When the rotating shaft 10 of the motor 5 is rotated in the other direction (in the direction of arrow B, clockwise in this example), the diaphragm 1 operates and the coil spring 7 also rotates (co-rotates) in the direction of arrow B together with the rotating shaft 10. . The 24th portion 7b of the coil spring 7 rotates approximately one revolution and presses the second projecting piece 9 from above (FIG. 2(b)). Since the pressing force at this time is in the direction in which the coil spring 7 closes, the attractive force of the permanent magnet 21 is overcome and the coil spring 7 continues to rotate along with the rotation @io. Due to this pressure, the discharge valve 3 begins to rotate in the direction of the arrow, opening the discharge hole 2. When the discharge hole 2 is opened, the pressurized medium is rapidly discharged from the pressure reservoir.

When the discharge valve 3 rotates to a certain extent, the coil spring 7 111
The 124 portion 7b comes off from the second protruding piece 9 (FIG. 2(C)), that is, the second protruding piece 9 moves out of the rotation locus 2 of the vJ2 end 7b. At this time, the first protruding piece 8 is within the rotation locus (2) of the first end 7a, the fill spring 7 further rotates in the direction of arrow B, and the first end 7a moves the first protruding piece 8 upward. At the same time, the discharge valve 3 is further rotated in the direction of the arrow. When the rotation of the discharge valve 3 is stopped, such as by hitting the permanent magnet 22, the first end 7a of the coil spring 7 presses the first protrusion 8, counteracting the loosening direction of the coil spring 7. As a result, the co-rotation is canceled and rotation of the rotating shaft 10 is allowed. Therefore, even if the coil spring 7 is prevented from rotating, the rotating shaft 10 of the motor 5 continues to rotate in the direction of arrow B. Note that once the exhaust valve 3 opens, there is no need to continue rotating the rotary shaft 10, so the motor 5 may be stopped when the exhaust valve 3 opens. When the discharge valve 3 is in the closed state, it is not necessary that the end of the fill spring 7 is pressed against the projecting piece to release the co-rotation and allow the rotating shaft 10 to rotate.

As described above, the diaphragm pump of the present invention has a valve closed state when the motor switches from rotating in one direction to rotating in the other direction [i.e., when the motor rotates in one direction, the valve is in the closed state (see FIG. 5(a)).
), when starting the motor rotation in the other direction, the second
Since ml'ffi is at a position that is more than half a turn behind the position where the second protrusion is pressed when rotating in the other direction, in order to operate the discharge valve, the rotation shaft of the motor must be rotated in the other direction more than half a turn. There must be. However, in this example,
When the motor is stopped by the small amount evacuation means, the pressure in the pressurized medium chamber is not always maintained at a high pressure, but is the same as the external pressure, so when pressurizing again or performing rapid exhaust, a small torque is required. The motor can be started and the next operation can be performed reliably.

FIG. 6 shows pressure fluctuations within the diaphragm 1 and within the pressure storage section. In the figure, ■ indicates the pressure inside the pressure storage part, and ■ inside the diaphragm 1 ■ indicates the pressure fluctuation inside the diaphragm 1 when the conventional trace discharge means is not provided. Conventionally, as shown in (■), after the end of pressurization, air with at least the same pressure as the pressure storage part remains in the diaphragm 1, and when the motor 5 starts rotating when repressurization (or exhaust operation) is started. ,
A large amount of torque is required. In this embodiment as well, a high pressure is instantaneously reached during pressurization, but even if rapid evacuation becomes necessary during pressurization, the pressurized medium chamber is
After a delay time has elapsed until the internal pressure of the pump 4 is sufficiently lowered, the evacuation operation is started, so the evacuation operation can be performed reliably.

Embodiment 21 FIG. 7 shows a second embodiment, in which a recess ff532 is formed at the edge of the suction hole 18 as a means for discharging a small amount.

[Example 31 Figures 8 and 9 show the tIS3 embodiment, and the suction hole IE
A protrusion 33 is provided protrudingly on the surface of the check valve 19 facing I, and the protrusion 33 of the check valve 19 is placed against the edge on the suction hole 18 side, so that a gap is formed between the check valve 19 and the suction hole 18. A gap is formed, and the pressurized medium is leaked from the pressurized medium chamber 14 through this gap.

[Embodiment 41 FIG. 10 and FIG. , leaking pressurized medium.

[Embodiment 51 In FIG. #1112 showing the fifth embodiment, a microhole 35 communicating with the outside is formed at the bottom of the pressurized medium chamber 14 as a micro-draining means.

[Example 61 tIrJ13 Figure shows a sixth example, in which a minute hole 36 is formed in the diaphragm 1. Further, a groove-shaped minute discharge means may be formed at the joint between the diaphragm 1 and the pressurized medium chamber 14.

[Embodiment 71 FIG. 14 shows a seventh embodiment, in which the seal portion 37 of the diaphragm 1 is utilized. The pressurized medium chamber 1 is located at the seal portion 37 of the diaphragm 1 in the -gA section of the pump stand 11.
A substantially T-shaped microhole 38 is formed to communicate between the hole 4 and the outside. Further, the check well 19 and the suction hole 18 are formed at the bottom of the pump stand 11. A protrusion 37a is formed in this seal portion 37, and the protrusion 37a opens and closes the opening surface of the microhole 38 of the pressurized medium chamber 14gA. When the pressure inside the diaphragm 1, that is, the pressure in the pressurized medium chamber 14 becomes high, the diaphragm 1 is pulled in the direction of the arrow as shown in FIG. Let the air inside leak out as shown by the arrow. When the internal pressure of the diaphragm 1 decreases, as shown in FIG. 15(a), the diaphragm 1 automatically returns to its original state due to its own elasticity and closes the microhole 38 with the protrusion 37a.

[Embodiment 81 FIG. 16 shows an eighth embodiment, in which a microhole 40 is formed in the upper part of the pump stand 11 to communicate the pressurized medium chamber 14 with the outside,
A stop valve 39 is provided on the upper surface of the microhole 40.

By the way, since the trace discharge means functions to leak the air in the pressurized medium chamber 14 to the outside, there is a possibility that the output of the pump itself may be reduced during pressurization. Therefore, by opening and closing the stop valve 39 as necessary, that is, by closing it when the pump is pressurizing and opening it when the pump is stopped, the output of the pump during pressurization can be prevented from decreasing (and when the pump is being pressurized again). It is necessary to start the pressurizing operation with low torque.In other words, as shown in Fig. 16, when the pump pressure is low, the stop valve 39 closes the microhole 40 with its own elasticity, preventing air leakage. cut off the
When the high pressure is reached, the stop valve 39 is energized by the high pressure in the pressurized medium chamber 14 to open the microhole 40, allowing the air in the pressurized medium chamber 14 to leak, and Prevents internal pressure from remaining high. Therefore, the repressurization operation can be started with low torque without reducing the output of the pump during pressurization. Furthermore, in a supply/exhaust system that performs rapid exhaust by utilizing the reverse rotation of the motor 5, the exhaust operation can be reliably completed with low torque.

In addition, the stop valve 39 may be opened in conjunction with the stop of the pump using a solenoid valve or the like, and a detection means may be provided to detect when the motor 5 does not restart (motor lock).
The stop I valve 39 may be opened by obtaining the output of this detection means.The motor lock detection means detects whether the internal pressure of the cuff band does not rise or fall by a predetermined pressure within a predetermined time, and when the motor lock is detected. At the time of a drop in the motor terminal voltage or during sudden exhaust, this may be done by detecting whether the pressure has dropped below a certain pressure.

[Embodiment 9] FIGS. 17 and 18 show a ninth embodiment, in which a stop valve 42 for opening and closing a microhole 41 communicating between a pressurized medium chamber 14 and the outside is connected to a rotating shaft 10 of a motor 5. The rotation of the stop valve 42 is used to control the opening of the stop valve 42 in conjunction with the stop of the pump. A coil spring 45 is attached to the rotating shaft 10 of the motor 5, and a stop valve 42 controlled by the coil spring 45 is rotatably supported by a pongee 46. Pump stand 1
A spring 43 is housed in a recess 44 surrounded by the chamber 1, and the portions J and K in the figure communicate with each other internally. It communicates with

During pressurization, the motor 5 rotates in the input direction shown in FIG.
Press lS42m. By pressing the end portion 42a of the stop valve 42, the stop valve 42 closes the microhole 41 against the biasing force of the spring 43.

While the motor 5 is rotating, the coil spring 45 continues to press the stop valve 42 due to the frictional force with the rotating shaft 10, and the small hole 41
occlude. When the pressurized medium chamber 5 stops, the stop valve 42 is urged upward by the urging force of the spring 43, leaving the micro-hole 41 open and allowing the air from the pressurized medium chamber 14b to go outside through the micro-hole 41. This prevents the internal pressure of the pressurized medium chamber 14 from being maintained at a high pressure.

[Effects of the Invention] As described above, the present invention includes an operating member that is reciprocated by the rotational output of the motor, a pressurized medium chamber whose capacity is changed by the operating member, and a medium that is fed into the pressurized medium chamber. An electronic pump equipped with an electric pump having a suction hole, a check valve for closing the suction hole, a discharge hole for sending the pressurized medium from the pressurized medium chamber to the ischemia section, and a discharge valve for closing the discharge hole. The blood pressure monitor is equipped with a trace discharge means for leaking a small amount of pressurized medium from the pressurized medium chamber to the outside, so that when pressurizing, high pressure medium without a cuff band flows back into the pump chamber from the discharge hole. Even if the internal pressure in the pump chamber increases, the small amount of pressurized medium in the pressurized medium chamber leaks to the outside using the small amount discharge means, which lowers the internal pressure in the pump chamber, making it easy to restart the motor when the pump is clogged. It is effective.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a perspective view of the same embodiment.
r-1' sectional view of the figure, Figure 3 is n-n' of Figure 11 of the same figure.
A sectional view, FIG. 4 is a perspective view of the main parts of the same as above, and FIGS.
f) is an explanatory diagram of the operation, and Fig. 6 is a diagram showing the pressure characteristics of the same as above.
PIS 7 is a perspective view of the main part of the second embodiment, FIG. 8 is a sectional view of the main part of the third embodiment, and FIG. 9 is a perspective view of the check valve.
Fig. 10 is a sectional view of a main part of the fourth embodiment, Fig. 11 is a perspective view of the check valve, Fig. 12 is a sectional view of the fifth embodiment, and Fig. 13 is a sectional view of the sixth embodiment. 14 is a sectional view of the seventh embodiment, FIGS. 15(a) and 15(b) are explanatory diagrams of the operation, and FIG. 16 is a sectional view of the eighth embodiment,
FIG. 17 and FIG. 18 are sectional views of Example 9, respectively. 1 is Guya 7 ram, 2 is discharge hole, 3 is valve, 5 is motor,
14 is a pressurized medium chamber, 18 is a suction hole, and 19 is a check valve. Agent Patent Attorney Stone 1) 艮 71 Guya 7 Ram Figure 3 Figure 7 ＼ Figure 8 1 oz 1 oz.

Claims (1)

[Claims] (1) An operating member that is reciprocated by the motor rotation output;
A pressurized medium chamber whose capacity is changed by the actuating member, a suction hole that feeds a medium into the pressurized medium chamber, a check valve that closes the suction hole, and a pressurized area that is pressurized from the pressurized medium chamber. An electronic blood pressure monitor equipped with an electric pump having a discharge hole for feeding a medium and a discharge valve for closing the discharge hole, comprising a trace discharge means for leaking a trace amount of the pressurized medium in the pressurized medium chamber to the outside. An electronic blood pressure monitor characterized by: