JPH0645862Y2 - Pressure detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a pressure detecting device, and more particularly to a pressure detecting device suitable for detecting a minute pressure such as a blood pressure measuring device.

[Prior art and its problems]

In recent years, various types of blood pressure measuring devices have been proposed, and increasingly smaller ones have been proposed.

As a pressure detecting device applied to a blood pressure measuring device, a device that is small and capable of accurately detecting a minute pressure is required. However, in the conventional pressure detecting device, The response does not change linearly, for example, even if the pressure increases at a constant rate, the elongation response of the pressure sensor does not change linearly, and even if the applied pressure is returned to zero, the pressure sensor However, some of them have drawbacks such as not recovering to the initial state. For this reason, the rate of occurrence of measurement error is high, and it is unsuitable for use in a blood pressure measuring instrument which requires particularly accurate measurement. Therefore, there is a demand for the appearance of a pressure detection device that is compact and capable of detecting a minute pressure.

The present invention meets the above-mentioned demands, and the relationship between the pressure and the elongation response of the pressure sensor can be changed temporarily, and the recovery to the initial state is sure and the durability is excellent. It is an object of the present invention to provide a small-sized pressure detection device that accurately detects a minute pressure.

[Means for solving problems]

In order to achieve the above object, the present invention has a hollow shape,
Further, inside the main body having the pressure introducing hole formed on the lower surface, the O-ring and the pressure receiving portion in the central portion are provided in a state of surrounding the pressure introducing hole, and the mountain is concentric with the pressure receiving portion. A pressure sensor in which a bellows-like portion having a groove and a valley is formed, a reinforcing ring, a spacer, and one metal plate are sequentially stacked and arranged, and the pressure sensor and the reinforcing ring are integrally formed. When the pressure sensor is fixed, the other metal plate is disposed on the upper surface of the pressure receiving portion of the pressure sensor, and when the pressure sensor is moved up and down by applying pressure to the pressure introducing hole, the other metal plate is also integrally formed. A means for moving up and down in parallel with the one metal plate is adopted.

[Action]

The present invention adopts the above-mentioned means, and in particular, by fixing the outer peripheral portion of the pressure sensor integrally with the reinforcing ring provided on the upper portion of the pressure sensor, the pressure sensor can be made small and lightweight, and can be incorporated in a blood pressure measuring device. However, it does not increase the weight of the blood pressure measuring instrument, and also improves the durability by reinforcing the outer peripheral portion of the pressure sensor, and the recovery to the initial state is sure, and the pressure and pressure sensor Since it is possible to make the relationship with the elongation response of the linear relationship linear, it is possible to eliminate a detection error and accurately detect a minute pressure.

〔Example〕

 Embodiments of the present invention shown in the drawings will be described below.

1 to 3 show an overall blood pressure measuring device provided with a pressure detecting device according to the present invention, and this blood pressure measuring device has a wristwatch-shaped main body 1 of the blood pressure measuring device. And a cuff 2 which is an air bag detachably attached to the back surface side of the main body 1 of the blood pressure measuring device.

The main body 1 of the blood pressure measuring device has a band part on both sides of the display part 3.
4a and 4b are provided respectively, and a stopper 5a is provided at the tip of one band portion 4a, and a stopper 5a provided at the tip of the one band portion 4a is also provided at the tip of the other band portion 4b. A stop 5b that can be stopped is provided.

On the back surface of the display unit 3, a cuff 2 which is an air bag described later.
7 is provided with a hole 7 which is a pressure introducing hole into which the pressure outflow part 6 provided in the pressure detecting part 6 can be fitted. The pressure detecting device of the present invention as shown in FIG. 7 is provided inside the display part 3 corresponding to the hole 7. A device 8 is provided and both band parts 4 continuous with the display part 3 are provided.
Positioning recesses 9 are provided at predetermined intervals at a and 4b, and one of the positioning recesses 9 is recessed.
In 9a, a pump 10 as shown in FIGS. 4 to 6 is attached as a part thereof.

That is, in this pump 10, the main body of the pump 10 is formed of the hand portion 4b, and the band portion 4b which is the main body of this pump is used.
A bellows 12 is arranged on the upper part of the hole 11 penetrating through so as to be able to extend and contract in the vertical direction in a state of surrounding the hole 11, and at the upper part of the opening of the bellows 12, a hole 13 provided at the center is formed on the lower surface. A pressing plate 15 that can be opened and closed by a reed 14 that is a second valve provided in the above is provided.

Further, the lower portion of the hole 11 formed in the band portion 4b has the concave portion.
9a and the hole is formed in the recess 9a.
11 can be opened and closed by the lead 16 which is the first valve.

Further, an engaging portion 17 is provided on the upper surface of the band portion 4b adjacent to the bellows 12, and an inner end is pivotally attached to the upper surface of the pressing plate 15 at the engaging portion 17 and an outer end thereof. A pair of handles 18 with hooks, which are swingably arranged in the vertical direction, can be engaged and disengaged. When disengaged, the state shown in FIG. And the perspective view at the time of engagement is as shown in FIG.

Then, when operating the above pump 10, first,
Both handles 1 engaged in the state shown in FIGS. 5 and 6.
By rotating 8 and 18 upward, the engagement with the engaging portions 17 and 17 of the band portion 4b is released to obtain the state shown in FIG.

After that, when the bellows 12 is expanded / contracted in the vertical direction by using the both handles 18, 18, the lead 14 closing the hole 13 provided in the pressing plate 15 at the time of expansion / contraction opens the hole 13 to release air. When the bellows 12 is introduced into the bellows 12, and then the pressing plate 15 is pressed by using the handles 18 and 18 to contract the bellows 12, the air located inside the bellows 12 is released from the holes 11
Open the lead 16 that closes the
Air is discharged below 4b.

On the other hand, the cuff 2, which is detachably attached to the back surface of the main body 1 of the blood pressure measuring device, is configured to be expandable and contractible with a synthetic resin or the like, and the entire length is shorter than the main body 1 of the blood pressure measuring device and has a width. Are almost the same, and this cuff 2 is
A pressure outflow portion 6 that can be fitted into a hole 7 provided on the back surface of the display portion 3 of the main body 1 of the blood pressure measuring device is provided at the center portion of the surface, and the pressure provided at the center portion of the surface is provided. Protrusions 19 for positioning are provided on both sides from the outflow portion 6 at a predetermined interval, and among the protrusions 19, the protrusion 19a that matches the pump 10 of the main body 1 of the blood pressure measuring device is As shown in FIGS. 4 and 5, a hole 20 communicating with the inside of the cuff 2 which is an air bag is provided.

In addition, the pressure outflow portion 6 provided in the display portion 3 and the cuff 2
As shown in FIG. 7, the relationship between and is shown. When the cuff 2 which is the air bag is attached to the back surface of the main body 1 of the blood pressure measuring device, the pressure outflow portion 6 provided in the cuff 2 is A pressure detecting device 8 according to the present invention is provided inside the hole 7 of the display unit 3 which is fitted into a hole 7 provided on the back surface of the display unit 3 of the main body 1 of the blood pressure measuring device.

7 and 8 are cross-sectional views showing the main part of the pressure detecting device 8 of the present invention. FIG. 7 shows a state in which no pressure is applied, and FIG. 8 shows a state in which pressure is applied. . In the figure, a pressure detecting device 8 is provided on a cuff 2 which is an air bag, and the pressure detecting device 8 has an inside of a hollow main body 1 in which a hole 7 which is a pressure introducing hole is formed on a lower surface. In the state where the pressure introducing hole 7 is surrounded, an O-ring 30 is located, and an outer peripheral edge portion of a pressure sensor 32 having a pressure receiving portion 35 in the central portion is located above the O-ring 30 and is located on the upper surface thereof. Reinforcement ring 31
Is located on the upper surface of the reinforcing ring 31, and the spacer 33
Is placed on the upper surface of the spacer 33.
Are located in the cavity of the body 1 of the pressure measuring device.

Further, the outer peripheral edge portion of the pressure sensor 32 and the reinforcing ring 31 located above the pressure sensor 32 are integrated by bonding, welding, or soldering.

Further, the pressure sensor 32 has a flat pressure receiving portion 35 at the center.
On the outside of the pressure receiving portion 35, there are a plurality of peaks 36, 36, which are concentric circles centering on the pressure receiving portion 35.
And a bellows portion composed of a plurality of valley portions 37, 37, ... Is formed, and a metal plate 38 is provided on the upper surface of the pressure receiving portion 35 and is attached to the main body of the blood pressure measuring device. The metal plate 34 is in parallel with the metal plate 34 at a predetermined distance, the metal plate 34 is directly connected to the metal plate 34, and the metal plate 38 is connected with lead wires 39 and 39 via a pressure sensor 32. There is.

On the other hand, in the conventional pressure detecting device 40, as shown in FIG. 9, like the pressure detecting device 8 of the present invention, the pressure detecting device 40 is provided on the cuff 2 and has a hole 7 on the back surface. An O-ring 41 is located inside the hollow main body 1 surrounding the hole 7, and a pressure sensor is provided above the O-ring 41.
The outer peripheral edge of the pressure sensor 42 is located, the spacer 43 is located on the upper surface of the outer peripheral edge of the pressure sensor 42, and the metal plate 44 is located on the upper surface of the spacer 43. It is set up. Therefore, unlike the pressure detecting device 8 of the present invention, the reinforcing ring 31 is not provided, and the outer peripheral portion of the pressure sensor 42 is not fixed.

Further, the pressure sensor 42 is provided with a flat pressure receiving portion 45 in the central portion thereof, and on the outside of the pressure receiving portion 45, a plurality of ridges 46, 46 ... And a plurality of concentric circles centering on the pressure receiving portion 45 are formed. Is formed with a metal plate 48 on the upper surface of the pressure receiving portion 45, and the metal plate 44 attached to the main body 1 of the blood pressure measuring device and a predetermined shape. The lead wires 49 and 49 are connected to the metal plate 44 directly and to the metal plate 48 via the pressure sensor 42, respectively.

Then, by measuring the capacitance between the metal plate 48 and the metal plate 44 located on the upper surface of the pressure receiving portion 45 of the pressure sensor 42 via the lead wires 49, 49, the pressure receiving portion 45. Although it is possible to calculate the pressure acting on the pressure receiving unit 45, when a pressure is applied to the pressure receiving unit 45, a conventional pressure detecting device is used.
In the case of 40, the pressure sensor 42 is displaced when the pressure changes as shown in FIG. 10, and the change in the gap between the metal plate 48 and the metal plate 44 located on the upper surface of the pressure receiving portion 45 has a primary relationship. Not
Therefore, accurate pressure measurement cannot be performed.

On the other hand, in the pressure detecting device 8 of the present invention,
As shown in the figure, a reinforcing ring 31 is integrally attached to the upper surface of the outer peripheral portion of the pressure sensor 32, and the pressure sensor 32 is reinforced by the action of the reinforcing ring 31, and the pressure sensor 32 is centered. Even when pressure is applied to the pressure receiving portion 35 of the pressure sensor 32, there is no fear of being pulled in the direction, and the pressure receiving portion 35 is pressed against the metal plate 34.
The metal plate 38 attached to the upper plate moves upward while maintaining the parallel state, and even when the application of pressure is stopped and the initial state is restored, the original state is surely restored, and the pressure change and the metal The change in the gap between the plates 34 and 38 becomes primary and the error in pressure detection is eliminated.

FIG. 11 shows the relationship between the applied pressure and the elongation rate of the pressure sensor of the present invention and the conventional pressure sensor.

Next, the main body 1 of the blood pressure measuring device configured as described above.
The case where air is provided to the inside of the cuff 2 when the cuff 2 that is an air bag is attached to the cuff 2, and the case where the air provided to the inside of the cuff 2 reaches the pressure outflow portion 6 will be described.

First, as described above, the pump 10 is operated to let air out through the hole 20 of the band portion 4b forming the main body of the pump 10, and by repeating this outflow operation, the air is discharged into the cuff 2. Air will be introduced.

On the other hand, the air introduced into the cuff 2 is provided in the main body 1 of the blood pressure measuring device via the pressure outflow portion 6 provided in the central portion of the cuff 2, and the pressure outflow portion 6 is fitted therein. The pressure detection device 8 disposed in the display unit 3 is operated by flowing into the hole 7 of the display unit 3 which is operating.

Next, the inside of the display unit 3 will be described. The display unit 3 has both the functions of a blood pressure measuring device and a clock, and as shown in FIG. It has a digital display unit 21 as.

The digital display unit 21 as the timepiece has the same configuration as a general digital timepiece, that is, the power supply 21A uses a general battery and the oscillator 21B uses a crystal oscillator.

The frequency divider 21C is a circuit that divides the pulse transmitted from the oscillator 21B into a cycle that matches the clock, and the counter circuit 21D counts the number of input oscillations sent from the frequency divider circuit 21C in units of seconds, minutes, and hours. To do. The decoder 21E instructs to operate the specification of the 7-segment numeral component in the display device 21F according to the numerical value input from the counter circuit 21D.

As a result, the time numbers are digitally displayed on the display device 21F.

When the blood pressure measurement unit 22 presses the cuff 2 against the wrist 23, the pulsation of the blood vessel changes the air pressure of the cuff 2. The change in the air pressure of the cuff 2, that is, the pressure detection device 8
Is sensed as a change in the air pressure in the pressure chamber 22A.

Therefore, the signal of the pressure detecting device 8 is transmitted to the oscillation circuit 22B.
This oscillation circuit 22B digitally converts the change in frequency transmitted from the pressure detection device 8 and transmits it to the processor 22C.

The processor 22C calculates a blood pressure value and a pulse rate according to the memory of a preset memory circuit, and outputs a signal corresponding to the change of the frequency transmitted from the oscillator circuit 22B, and the decoder 21E of the digital display unit 21 via the control circuit. To enter.

The timepiece and the blood pressure measuring device are selectively used by switching the switch 24.

The decoder 21E operates the 7 segments of the display surface 25 provided on the surface of the display unit 3 according to the blood pressure measurement value or the pulse value input from the processor 22C to display a digital number.

As described above, by wrapping the band portions 4a and 4b around the wrist 23, it can be carried at all times like a wristwatch, and normally, the air inside the cuff 2 is deflated and used as a wristwatch.

Next, when you want to measure blood pressure, handle 1 of pump 10
By repeatedly pressing 8 and 18 several times, air can be filled inside the cuff 2 and inside the air pressure chamber 22A communicating with the cuff 2, and by switching the switch 24 in advance, the blood pressure value is displayed instead of the time display of the clock. Can be displayed on the display surface 25.

In this case, as a method of displaying the blood pressure numerical value, it is possible to display numerical values such as systolic blood pressure and diastolic blood pressure, and it is also possible to display pulse rate and the like in addition to blood pressure.
If a temperature sensor is provided integrally, body temperature can be measured.

Therefore, since it can be worn on the wrist at all times, it is possible to measure the blood pressure as necessary and manage the health. Especially, it is suitable for those who have high blood pressure to manage their own health. .

Further, the display surface 25 can be configured in parallel for the timepiece and the blood pressure display, and further, a reference value for high blood pressure, for example, in the case of 180, a red lamp can be turned on or an alarm sound can be emitted. It is also possible to add a device to.

[Effect of device]

According to the present invention configured as described above, the outer peripheral edge portion of the pressure sensor that moves up and down according to the applied pressure is reinforced, the durability is improved, and the initial state is surely restored. Since the relationship between the applied pressure and the elongation response of the pressure sensor becomes a linear proportional relationship and the metal plate on the pressure sensor and the metal plate clamped and fixed by the spacer move in parallel, The pressure change and the capacitance change due to the gap change between the metal plates can be made to have a primary relationship, and an excellent effect that a minute pressure change can be accurately detected is provided.

[Brief description of drawings]

1 and 2 are schematic diagrams showing a blood pressure measuring device provided with a pressure detecting device according to the present invention, and FIG. 3 is a schematic diagram showing a state in which a main body of the blood pressure measuring device and a cuff are separated, and FIG. ~
FIG. 6 shows a pump provided in the blood pressure measuring device, FIG. 4 is a schematic vertical sectional view showing an expanded state, FIG. 5 is a schematic vertical sectional view showing a contracted state, and FIG. 6 is a schematic perspective view. FIG. 7 is a schematic view showing the position of the pressure outlet of the cuff and the pressure detecting device of the present invention, and FIG. 8 is a schematic longitudinal section showing a state in which pressure is applied to the pressure detecting device of the present invention. Fig. 9 is a schematic vertical sectional view of a conventional pressure detecting device,
FIG. 10 is a schematic longitudinal sectional view showing a state in which pressure is applied to the pressure detecting device shown in FIG. 9, and FIG. 11 is a relational diagram showing the elongation rate with respect to the applied pressure of the pressure sensor of the present invention and the conventional pressure sensor. FIG. 12 is a block diagram showing the relationship between the blood pressure measurement unit and the digital display unit. 1 ... Blood pressure meter body 2 ... Cuff 3 ... Display 4a, 4b ... Band 5a, 5b ... Stopper 6 ... Pressure outflow 7,11,13,20 ... Hole 8,40 ...... Pressure detection device 9, 9a ...... Recess 10 ...... Pump 12 ...... Bellows 14, 16 ...... Lead 15 ...... Press plate 17 ...... Engagement part 18 ...... Grip 19, 19a ...... Convex part 21 ...... Digital display 21A …… Power supply 21B …… Oscillator 21C …… Division circuit 21D …… Counter circuit 21E …… Decoder 21F …… Display device 22 …… Blood pressure measurement unit 22A …… Pressure chamber 22B …… Oscillation circuit 22C …… Processor 23 …… Wrist 24 …… Switch 25 …… Display surface 30,41 …… O-ring 31 …… Reinforcement ring 32,42 …… Pressure sensor 33,43 …… Spacer 34,38,44,48 …… Metal plate 35, 45 …… Pressure receiving part 36, 46 …… Mountain part 37, 47 …… Valley part 39, 49 …… Lead wire

Claims (1)

[Scope of utility model registration request] 1. A body having a hollow shape and having a pressure introducing hole formed in a lower surface thereof, and having an O-ring and a pressure receiving portion in a central portion in a state of surrounding the pressure introducing hole, And, a pressure sensor in which a bellows-shaped portion having a peak portion and a valley portion that are concentric with the pressure receiving portion, a reinforcing ring, a spacer, and one metal plate are sequentially stacked and disposed, and When the pressure sensor and the reinforcing ring are integrally fixed, and the other metal plate is arranged on the upper surface of the pressure receiving portion of the pressure sensor, when pressure is applied to the pressure introducing hole and the pressure sensor moves up and down. , The other metal plate is also integrated,
A pressure detecting device that moves up and down in parallel with the one metal plate.