JPH10332017A - valve - Google Patents

Abstract

(57) [Summary] [Problem] To exhaust at a constant speed and to achieve downsizing. SOLUTION: It has a substantially bottomed cylindrical upper valve 32 having a ventilation hole 35 provided on a bottom surface portion, a ventilation hole 36 provided on a bottom surface portion, and a valve seat 33a provided at an opening end. A substantially bottomed cylindrical lower valve 3 combined with the upper valve 32
3, the bottom portion of the upper valve 32 and the valve seat 33 of the lower valve 33
(a) and a film-shaped valve element 34 having elasticity provided movably between the valve element 34 and a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve suitable for use in an arterial medical information test apparatus used for obtaining medical information such as blood pressure information and peripheral circulation information.

[0002]

2. Description of the Related Art Conventionally, an arterial pulse wave is detected by a pressure sensor, and arterial medical information such as a blood pressure test apparatus is used to obtain medical information such as blood pressure information and peripheral circulation information from the amplitude and waveform of the arterial pulse wave. Inspection devices are known.

The arterial medical information inspection apparatus generally includes a detecting unit for detecting an arterial pulse wave, an air bladder for pressing the detecting unit against an artery, and filling the air bladder with air. An air compressor is provided.

[0004] The arterial medical information inspection apparatus is
In order to gradually reduce the pressing force applied to the artery when detecting an arterial pulse wave, an exhaust valve for discharging air in the pressing air bag is provided between the pressing air bag and the air compressor. Have been.

[0005] The arterial medical information inspection apparatus constructed as described above, when measuring the arterial pulse wave, is mounted by winding a pressure air bag around the outer circumference of the arm, and is placed in the pressure air bag. Fill air with an air compressor. Thus, in the arterial medical information inspection apparatus, the air bladder presses the artery of the arm to regulate blood flow, and also presses the detection unit against the artery. Then, the arterial medical information inspection apparatus starts the blood flow of the artery by discharging the air filled in the air bladder through the exhaust valve, and detects the arterial pulse wave by the detection unit. .

[0006]

By the way, it is desired to reduce the size of the entire arterial medical information examination apparatus in consideration of its use in homes and the like other than medical institutions and its portability. I have.

[0007] However, the exhaust valve provided in the arterial medical information examination apparatus exhausts the air in the air bladder at a constant speed when exhausting the gas, thereby reducing the pressing force applied to the artery at a constant speed. Therefore, it is difficult to reduce the size because the pressure needs to be gradually reduced and the pressing air bag has a total volume of about 200 cc.

Accordingly, an object of the present invention is to provide a valve capable of exhausting at a constant speed and reducing the size.

[0009]

In order to achieve the above object, a valve according to the present invention is movably provided between a valve seat formed at one open end of an upper and lower valve and the other bottom surface. It is provided with a provided film-shaped valve element having elasticity.

[0010] According to the valve configured as described above, when the gas is discharged from the air hole, the valve body is elastically deformed following the bottom surface portion to close the air hole. And this valve is
Since the amount of exhaust is controlled by an elastic valve body according to the pressure change in the valve, the exhaust is performed at a constant speed.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a specific embodiment of the present invention will be described with reference to the accompanying drawings, in which an arterial medical information inspection apparatus provided with an exhaust valve adapted to gradually reduce the pressure applied to an artery. Will be explained. As shown in FIG. 1, the arterial medical information testing apparatus 1 includes a device main body 3 for detecting medical information, and a wrapper 4 for supporting the device main body 3 and attaching it to a wrist. .

As shown in FIGS. 1, 2 and 3, the apparatus main body 3 has a detecting section 6 for detecting an arterial pulse wave as a pressure change.
A pressing air bladder 7 for pressing the detection unit 6 against the radial artery L1 and pressing the ulnar artery L2, an air pump 8 for sending air to the pressing air bladder 7, and a pressing air bladder. An exhaust valve 9 is provided between the air pump 7 and the air pump 8 to discharge air.

As shown in FIGS. 1, 2 and 3, the apparatus main body 3 has a case 11 for accommodating the air pump 8 and the exhaust valve 9 therein, and a detecting unit provided on the case 11. 6, a display panel 12 for displaying medical information based on the detected values, operation buttons 13 and 14 for switching the display contents of the display panel 12, and a set of operation buttons 15a for pushing the air pump 8 in. , 15
b.

As shown in FIGS. 2 and 3, the detecting unit 6
The radial artery L1 is disposed at a position facing the radial artery L1.
First and second pressure sensors 21 for detecting pressure changes of
22, a blood flow restricting element 23 which presses the radial artery L1 to regulate blood flow, and a radial artery L1 provided in the exhaust valve 9
Pressure sensor 24 that detects the pressure applied to
And a pressure plate 25 that presses the first and second pressure sensors 21 and 22 and the blood flow restricting element 23.

The first and second pressure sensors 21 and 22 are:
For example, it is constituted by a piezoelectric transducer such as a piezoelectric microphone. Then, the first and second pressure sensors 21 and 22 and the blood flow restricting element 23 are arranged at three positions along arteries such as the radial artery L1 extending from the heart side to the peripheral side so as to be located at three places. Each is placed above.

That is, the first pressure sensor 21 is located on the heart side, and the second pressure sensor 22 is located in the middle. The blood flow restricting element 23 is located on the peripheral side. The pressing plate 25 is formed in a substantially rectangular plate shape and has a substantially U-shaped support member 2 attached to the additional band 4.
6, one end is rotatably supported via a rotation support shaft 27.

As shown in FIGS. 2, 3 and 4, the pressing air bladder 7 is provided on the surface of the wrapping band 4 on the side facing the wrist. A first air chamber 28 that rotates and presses the first and second pressure sensors 21 and 22 and the blood flow restricting element 23 against the radial artery L1, and a blood pressure is regulated by pressing the ulnar artery L2. And a second air chamber 29. In the pressing air bag 7, a first air chamber 28 and a second air chamber 29 are communicated with each other, and an air circulation port 30 that allows air to flow through each of the air chambers 28 and 29 is opened. ing.

The air bag 7 presses the air into the first and second air chambers 2 through the air inlet 30.
When the air is filled in the sections 8 and 29, the pressing plate 25 of the detecting section 6 and the ulnar artery L2 are pressed. The pressing air bag 7 has, for example, a total volume of 15
Approximately 20 cc, so that the size is significantly reduced.

As shown in FIG. 4, the air pump 8 has an air flow opening 31a at one end connected to the exhaust valve 9, and an air flow opening at the other end through which external air flows. 31b has been established. In addition, the air circulation port 31a
Is provided with a check valve 31c. The air pump 8 is housed in a case 11,
When the operation buttons 15a and 15b provided in the air conditioner are pushed, air is sent out to the pressing air bag 7 via the exhaust valve 9.

The exhaust valve 9 is a so-called automatic valve, as shown in FIGS. The exhaust valve 9 is movably disposed on a cylindrical upper valve 32 and a lower valve 33 which are combined with each other and a valve seat 33 a formed on an inner peripheral portion of an opening end of the lower valve 33. And a valve plate 34 having elasticity.

The exhaust valve 9 is formed, for example, in a circular film shape from aluminum and has an outer diameter of about 9 mm and an inner diameter of about 6.6 mm.
The exhaust valve 9 is, for example, an air flow port 35,
36 has a hole diameter of about 1 mm, and the depth of the valve seat 33a is 0.5 m.
m. The valve plate 34 is made of, for example, stainless steel and has an outer diameter of 7.4, for example.
mm and a thickness of about 0.05 mm.
Therefore, when the air is exhausted from the ventilation hole 35, the valve plate 34 is elastically deformed following the bottom surface of the upper valve 32 by the pressure of the flowing air, and closes the ventilation hole 35. As described above, the exhaust valve 9 is significantly reduced in size.

The upper valve 32 and the lower valve 33 are provided with vent holes 35 and 36 on the bottom surface, respectively. The exhaust valve 9 is connected to the air hole 35 by inserting the air circulation port 31 b of the air pump 8 into the air hole 35.
The air circulation port 30 of the pressurized air bag 7 is inserted and connected.

As shown in FIG. 5, the upper valve 32 and the lower valve 33 have air outlet holes 37 and 38 for allowing the air in the exhaust valve 9 to flow outward, respectively, so as to communicate with opposing positions. The third pressure sensor 24 of the detection unit 6 is disposed so as to close the air outflow holes 37 and 38. This third pressure sensor 24
Is configured by a pressure-electric conversion element made of, for example, a semiconductor or the like, and detects the pressure applied to the artery by detecting the air pressure in the exhaust valve 9.

The pressure change of the exhaust valve 9 configured as described above with respect to the time detected by the third pressure sensor 24 will be described with reference to FIG. As shown in FIG.
The vertical axis indicates the pressure (mmHg) of the air in the exhaust valve 9, and the horizontal axis indicates time (second). As shown in comparison with the broken line in FIG. 6, the pressure of the exhaust valve 9 changes substantially linearly with respect to time, and the pressure applied to the artery can be satisfactorily reduced at a constant speed. Can be.

As shown in FIG. 2 and FIG.
For example, it is formed in a belt shape by a cloth material, and at one end,
A mounting plate 39 for winding around the wrist for mounting is provided. The mounting plate 39 is formed in a substantially rectangular plate shape, and has an insertion slit 39a for inserting the additional band 4,
39b are respectively set up on the main surface. Mounting plate 39
The one end of the wrapping band 4 is inserted into and supported by one insertion slit 39a, and the other insertion slit 39
b, the other end of the wrapping band 4 is inserted, and this end is folded back and locked on the wrapping band 4, so that the wrapping band 4 can be detachably attached to the wrist. I have.

As shown in FIGS. 1 and 2, the case 11 of the arterial medical information inspection apparatus 1 is formed to be curved along the outer shape of the wrist. As shown in FIGS. 1 and 2, operation buttons 13 and 14 for switching the display on the display panel 12 are provided on side surfaces parallel to each other across the display panel 12 provided on the main surface of the case 11. I have. Further, operation buttons 15a and 15b for operating the air pump 8 are provided on parallel side surfaces of the case 11, respectively.

The operation of measuring medical information such as blood pressure from the artery of the wrist will be described for the arterial medical information inspection apparatus 1 configured as described above. First, the arterial medical information examination apparatus 1 sends out air from the air pump 8 by pushing the operation buttons 15a and 15b, and the first and second airbags 7 of the pressing air bag 7 through the exhaust valve 9. Air chamber 2
8, 29 are filled with air, respectively.

The first air chamber 28 of the pressurized air bag 7 is filled with air to rotate the press plate 25,
First and second pressure sensors 21 and 22, blood flow restricting element 2
3 is pressed through the skin against the radial artery L1. Also, the second
The air chamber 29 presses the ulnar artery L2 through the skin by being filled with air.

Then, the arterial medical information inspection apparatus 1 sends the air filled in the first and second air chambers 28 and 29 of the pressurized air bag 7 to the air pump 8 via the exhaust valve 9. By evacuating gradually, the first and second pressure sensors 21 and 22 and the blood flow restricting element 2 for the radial artery L1
3. Each pressing force is gradually reduced at a constant speed.

In the arterial medical information inspection apparatus 1, the third pressure sensor 24 detects the pressure at which the blood flow starts due to the increase in the output level of the second pressure sensor 22, and controls this pressure to be constant. . In the arterial medical information inspection apparatus 1, this state is a measurement state, and the first pressure sensor 21 outputs a predetermined time constant differential signal of a pressure pulse wave (volume pulse wave).

As described above, the exhaust valve 9 according to the present invention includes the valve seat 3 formed on one of the upper and lower valves 32, 33.
By providing an elastic film-shaped valve plate 34 movably provided in 3a, the amount of exhaust is controlled by the valve plate 34 according to a change in the pressure in the exhaust valve 9.
The exhaust can be performed at a constant speed, and the size can be reduced.

Further, since the arterial medical information inspection apparatus 1 includes the exhaust valve 9, the entire apparatus can be downsized.

Although the exhaust valve 9 according to the present invention has been applied to the arterial medical information inspection apparatus 1, it is suitable for use in other apparatuses that require exhaust at a constant speed.

Next, a circuit configuration of the arterial medical information examination apparatus 1 according to the embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 7, the arterial medical information inspection apparatus 1 includes the above-described first pressure sensor 21, second pressure sensor 22, blood flow restricting element 23, and third pressure sensor 24. And

In addition, the arterial medical information inspection apparatus 1 has a first
A first level detection circuit 51 for detecting the level of the pressure sensor 21, a timer 53, a timer 56, and a timer 60 to which the output of the first level detection circuit 51 is input as a timer start signal; A counter 52 to which the output of the level detection circuit 51 is supplied and which supplies a timer stop signal to the timer 53, and an output of the first level detection circuit 51 which is supplied via a bottom detector 54 and which receives the timer 56
A counter 55 for supplying a timer stop signal to the
The output of the level detecting circuit 51 is supplied via a differentiating circuit 57 and a bottom detector 58, and a counter 57 for supplying a timer stop signal to the timer 60 is provided.

The arterial medical information test apparatus 1 is provided with an arithmetic circuit 62 and an arithmetic circuit 63 to which the output of the timer 53 and the output of the timer 60 are supplied and which calculates metabolic information and the like.
, A switch SW for switching a signal supplied to the arithmetic circuit 62 or the arithmetic circuit 63 from the third switch,
And a divider 65 which divides the output of the above and outputs the degree of hardening information and the like.

In addition, the arterial medical information inspection apparatus 1 has a second
, A second level detection circuit 66 for detecting the level of the pressure sensor 22, a third level detection circuit 67 for detecting the level of the third pressure sensor 24, and a second level detection circuit 6.
6 and a pressing control unit 68 for controlling the pressing force and the like of the pressing air bag 7 based on the detection output of the third level detecting circuit 67.

Each of the first pressure sensor 21 and the second pressure sensor 22 is constituted by a pressure-electric conversion element such as a piezoelectric microphone as described above, and detects an arterial pulse wave as a pressure change. Then, the first pressure sensor 21, the second pressure sensor 22, and the blood flow restricting element 23
As shown in (2), the air is injected into the pressing air bag 7 provided on the wrapping band 4 to press the skin and close the radial artery L1 on the wrist of the examinee.

The third pressure sensor 24 is constituted by, for example, a pressure-electric conversion element made of a semiconductor or the like as described above, and detects the air pressure in the exhaust valve 9.

The first level detection circuit 51 detects when the pressure detection output of the first pressure sensor 21 exceeds a predetermined level, that is, the time point a when the aortic valve is opened as shown in FIG. The pulse A is output. The pulse A output from the first level detection circuit 51 is supplied to the timer 53 and the timer 5
6 and the timer 60 as a timer start signal. Here, the output of the first pressure sensor 21 is as shown in FIG.
As shown in (b), it is output as a predetermined time constant differential signal of the pressure pulse wave (volume pulse wave).

The counter 52 includes a first level detection circuit 5
A pulse having a different polarity is output every time the pulse A output from the first aortic valve 51 is received (that is, when the first pulse is received from the first level detection circuit 51 (that is, the first aortic valve opening time a). , A negative pulse (that is, “0”) is output, and when the next pulse is received from the first level detection circuit 51 (that is, the time point b when the aortic valve is opened), a positive pulse (that is, “1”) is output. ) Is a preset counter that outputs B and outputs a negative pulse (ie, “0”) when receiving the next pulse from the first level detection circuit 51. The positive pulse B output from the counter 52 is supplied to the timer 53 as a timer stop signal.

The bottom detector 54 is connected to the first pressure sensor 21.
A pulse is output each time the bottom of the predetermined time constant differential signal, which is the output of, is detected. The counter 55 includes a bottom detector 54.
9 when receiving the pulse output from
The predetermined time T1 is determined by the compliance of the arm shown in FIG.
At the time point c of the minimum value of the predetermined time constant differential signal attenuating at the time point c, a positive polarity pulse C is output. The positive pulse C output from the counter 55 is supplied to the timer 56 as a timer stop signal.

The timer 53 includes a first level detection circuit 51
After receiving the pulse A, the counter 52 outputs the pulse B
, Ie, the heartbeat period RR of the pressure pulse wave (volume pulse wave), and outputs the measured value D. The timer 56 measures the time from receiving the pulse A from the first level detection circuit 51 to receiving the pulse C from the counter 55, that is, a predetermined time constant T1 having a correlation with the compliance, and outputs the measured value E. I do.

Further, a predetermined time constant differential signal which is a pressure detection output of the first pressure sensor 21 is output to a differentiating circuit 57. This differentiating circuit 57 differentiates the predetermined time constant differential signal as shown in FIG. Bottom detector 58
Outputs a pulse each time the bottom of the output signal of the differentiating circuit 57 is detected. The counter 59 outputs a positive pulse F when receiving two pulses output from the bottom detector 58. The positive pulse F output from the counter 59 is supplied to the timer 60 as a timer stop signal.

The timer 60 includes a first level detection circuit 51
After receiving the pulse A, the counter 59 outputs the pulse F
, The propagation ejection time T1 'is measured, and the measured value G is output as post-load information.

The measured value D from the timer 53 (the heartbeat period R
R) is supplied to the arithmetic circuit 62 or the arithmetic circuit 63 via the switch SW. The measured values G (propagation ejection time T1 ') from the timer 60 are also supplied to the arithmetic circuits 62 and 63. The circuits 62 and 63 perform the following calculations.

Arithmetic circuit 62; when subject = male: (413-T1 ') RR / 1000 Arithmetic circuit 63; when subject = female: (418-T1') RR / 1000 (1) Here, switching between male and female is performed by the switch SW. This equation (1) is equivalent to the following so-called Arnold
Weissler's Formula Man: LVET (ms) = T1 '=-1.7HR + 413 (ms) Woman: LVET (ms) = T1' =-1.6HR + 418 (ms) (2) Here, LVET is the cardiac ejection time, HR is the number of heart nights, and RR is the heart night period. The heart rate HR and the heartbeat period RR are HR = 60000
/ RR, the normal value of equation (2) is
Male: 1.7 × 60 = 102, female: 1.6 × 60 = 96. Then, the calculation results of the calculation circuits 62 and 63 are output as metabolic information.

The LVET is calculated as follows without using the Arnold-Weissler equation shown in the above equation (2).
1 'can also be obtained by normalization.

That is, the normalized LVET _C is as follows: LVET _C (ms) = T1 ′ / (RR) ^1/2 (3)

Therefore, in this case, it is not necessary to perform the operation by changing the operation circuit between men and women as in the Arnold-Weissler equation.

The above-described propagation ejection time T1 'has a respiratory variation. In this arithmetic circuit, in order to remove the fluctuation of the respiratory characteristic, an average value is continuously obtained for four or more nights.

Further, this LVET _C is calculated as
Has a very strong correlation. From the minute hourly staying amount I and the average blood pressure V that are correlated with the LVET _C , the cardiac work P is obtained as follows.

P = I × V (4) Accordingly, the amount of cardiac work P can be obtained by obtaining LVET _C.

By using the equation (3), the arithmetic circuit 62, the arithmetic circuit 63, and the switch SW for switching between them are provided, so that the male and female can be operated separately by one arithmetic circuit without performing the arithmetic operation separately for male and female. It can measure both women.

The measured value E (predetermined time constant T 1) from the timer 56 is supplied to a divider 65, which
A value E / G obtained by dividing the measured value E (predetermined time constant T1) by the measured value G (propagation ejection time T1 ') output from the timer 60.
Is output as curing degree information (compliance information).

On the other hand, the second level detection circuit 66
The level of the pressure detection output detected by the pressure sensor 21 is detected and supplied to the pressing control unit 68.

The third level detecting circuit 67 detects the level of the air pressure in the exhaust valve 9 detected by the third pressure sensor 24 and supplies the detected level to the pressing control unit 68.

The pressing controller 68 gradually reduces the pressing force of the pressing air bag 7 from the blood flow cutoff state based on the detection outputs of the second level detection circuit 66 and the third level detection circuit 67, for example. Also, control is performed such that the pressing force is kept constant in the blood flow passage limit state where the detection output signal from the second level detection circuit 66 is obtained.

Next, the operation of the arterial medical information examination apparatus 1 according to the embodiment of the present invention configured as described above will be described.

First, the pressing control section 41 controls the pressing air bladder 7 by the air pump 8 and the exhaust valve 9 so that the first pressure sensor 21 and the second pressure sensor 22 and the blood flow restricting element 23 are controlled. The pressing force at the three positions is gradually reduced from the blood flow blocking state. Then, the pressing control unit 41 detects the pressure at which the blood flow first passes through the level detector 40 due to the increase in the output level of the second pressure sensor 22, and controls the pressing force to be constant. This state is a measurement state, and the first pressure sensor 21 outputs a predetermined time constant differential signal of a pressure pulse wave (volume pulse wave).

The first level detection circuit 51 detects when the pressure detection output of the first pressure sensor 21 exceeds a predetermined level, that is, when the first aortic valve opening time a is detected.
The pulse A is output, and in response, the timer 53, the timer 56, and the timer 60 start measuring the cardiac cycle, the predetermined time constant, and the propagation ejection time, respectively.

The timer 53 includes a first level detection circuit 51
After receiving the pulse A, the counter 52 outputs the pulse B
Is received, that is, the heartbeat period RR of the pressure pulse wave (volume pulse wave) is measured, and the measured value D is output to the arithmetic circuit 62 or 63 via the switch SW. Timer 56
After receiving the pulse A from the first level detection circuit 51,
The time until the pulse C is received from the counter 55, that is, a predetermined time constant T1 having a correlation with the compliance is measured, and the measured value E is output to the divider 25. Timer 60
Measures the time from receiving the pulse A from the first level detection circuit 51 to receiving the pulse F from the counter 19, that is, the propagation ejection time T1 ', and outputs the measured value G as post-load information. At the same time, the measured value G
2, 63 and the divider 65.

The arithmetic circuits 62 and 63 perform an arithmetic operation based on the measured value D (heartbeat period RR) and the measured value G (propagation ejection time T1 ') according to the above equation (2), and output the metabolic information.

In the divider 65, the value E / G obtained by dividing the measured value E (predetermined time constant T1) from the timer 56 by the measured value G (propagation ejection time T1 ') output from the timer 60 is calculated as the degree of hardening. Output as information (compliance information).

Therefore, since the measurement is performed in the state of hemostasis, medical information such as afterload (whole body impedance), arm compliance and metabolism (thyroid function) can be easily obtained without being affected by peripheral resistance and without invasion. Can be obtained.

As described above, the arterial medical information inspection apparatus 1 can detect medical information such as post-load information, arm compliance, and thyroid condition.

Next, an example of display contents of the display panel 12 of the arterial medical information examination apparatus 1 will be described with reference to the drawings.

The display panel 12 displays the systolic blood pressure and the diastolic blood pressure as a detection result of the medical information, as shown in FIG. Further, the arterial medical information inspection apparatus 1 has a memory for storing data of systolic blood pressure and diastolic blood pressure, and the display panel 12 displays, for example, data for several days based on the stored data. It is displayed as a graph as shown in FIG. When detecting medical information, the display panel 12 displays the heart rate (HR) as shown in FIG. 10 (b) and the cardiac ejection time (E) as shown in FIG. 10 (c).
T) or a heartbeat waveform as shown in FIG. 10 (f) is displayed. The display panel 12 displays a date and time as shown in FIG. 10D when medical information is not detected.

In the arterial medical information inspection apparatus 1, the display on the display panel 12 is switched by the operation button 1 described above.
3 and 14.

In the arterial medical information inspection apparatus 1, the operation button 13 is operated to
The display up to (d) is sequentially switched. That is, FIG.
The display of the systolic blood pressure and the diastolic blood pressure shown in FIG.
Display of the number of heart nights (HR) shown at 0 (b), followed by FIG.
The display of the cardiac ejection time (ET) shown in (c) and the display of the date and time shown in FIG.
By providing a two-contact up / down key as the operation button 13, the display in the reverse order can be repeated.

Further, in the arterial medical information inspection apparatus 1, the display is switched to the display shown in FIGS. 10 (e) and 10 (f) by operating the operation button 14. That is, FIG.
By operating the operation button 14, the display of the systolic blood pressure and the diastolic blood pressure shown in FIG. 10A is switched to the display of the systolic blood pressure or the diastolic blood pressure shown in FIG. FIG.
From the display of the cardiac ejection time shown in FIG.
Is operated, the display is switched to the heartbeat waveform display shown in FIG.

As described above, the arterial medical information inspection apparatus 1
Then, the detected medical information can be displayed to inform the user of the detection result.

[0074]

As described above, according to the valve of the present invention, the valve has elasticity movably provided between the valve seat formed at one open end of the upper and lower valves and the other bottom surface. By providing a film-shaped valve body, the displacement is controlled by the valve body according to the pressure change in the valve,
The exhaust can be performed at a constant speed, and the size can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view showing an arterial medical information inspection apparatus to which an exhaust valve according to the present invention is applied.

FIG. 2 is a perspective view showing the arterial medical information inspection apparatus from the bottom side.

FIG. 3 is a side view showing the arterial medical information inspection apparatus.

FIG. 4 is a schematic view showing the arterial medical information inspection apparatus.

FIG. 5 is a longitudinal sectional view showing an exhaust valve according to the present invention.

FIG. 6 is a diagram showing a pressure change with respect to time in the exhaust valve.

FIG. 7 is a block diagram showing a circuit configuration of the arterial medical information inspection apparatus.

FIG. 8 is a diagram showing a state in which an artery is pressed by first and second pressure sensors and a blood flow restricting element of the arterial medical information inspection apparatus.

FIG. 9 is a diagram illustrating detection information and the like of the arterial medical information inspection apparatus.

FIG. 10 is a diagram for explaining display contents of a display panel of the arterial medical information inspection apparatus.

[Explanation of symbols]

1 Arterial medical information inspection device, 9 Exhaust valve, 32
Upper valve, 33 Lower valve, 33a Valve seat, 34 Valve plate, 35, 36 Vent

Claims (2)

[Claims] 1. A pair of upper and lower valves each having a substantially bottomed cylindrical shape and having a ventilation hole provided in a bottom portion thereof, and a pair of upper and lower valves, and a valve seat formed at one open end of the upper and lower valves. And a film-shaped valve body having elasticity movably provided between the bottom surface and the other bottom surface. The valve body is elastically deformed following the bottom surface when discharging gas from the vent hole. A valve characterized by closing a vent hole. 2. The valve according to claim 1, wherein a communication hole is provided in the valve, and a pressure sensor for closing the communication hole and detecting a pressure of gas in the valve is provided. valve.