JPH06312021A - Respiratory vibration generator for artificial respiratory apparatus - Google Patents

Abstract

(57) [Abstract] [Purpose] Proper and efficient pulsation is generated by smoothing the flow of air to suppress pressure loss and preventing air leakage. The pressure switching mechanism includes a common chamber 6 communicating with the breathing port 3, one opening of the common chamber 6 and a pressurizing chamber 7 communicating with the pressurizing port 4, and the other opening of the common chamber 6. The negative pressure chamber 8 communicating with the negative pressure port 5, the common chamber 6, the pressurizing chamber 7 and the motor mounting shaft 9 arranged below the negative pressure chamber 8, and one of the common chambers 6 fixed to the motor mounting shaft 9. The slit plate 12 for sealing the opening of the motor mounting shaft 9 and the slit plate 13 fixed to the motor mounting shaft 9 for sealing the other opening of the common chamber 6 are provided. It is set in a state of being shifted by 180 degrees in the circumferential direction of 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a respiratory vibration generator for a ventilator, and more particularly to a respiratory vibration generator for a ventilator suitable for producing proper and efficient pulsation.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Application No. 63-283915.
As described in Japanese Patent Application No. 63-283916 and Japanese Patent Application No. Sho 63-283916, a respiratory vibration generator is configured by a blower and a rotary valve mechanism, and breathing is performed by a rotary valve mechanism connected between the blower and the respiratory system path. A ventilator has been proposed in which the ventilating port and the negative pressure venting port of the blower are alternately communicated with each other to give a relatively rapid respiratory oscillation to the respiratory path.

In a conventional rotary valve mechanism, as shown in FIG. 7, a pair of valve body portions 53 extending so as to separate a rotor 51 in the axial direction of an output shaft 52 of a motor (not shown).
54 to form the rotary valve mechanism 50, and the valve body portions 53, 5
4 has a structure in which a cylindrical member, which is coaxial with the output shaft 52, is partially cut away. In the respiratory vibration generator, the motor is rotated to rotate the rotor 51, and the pressurizing port P1 or the negative pressure port P2 communicating with the blower is alternately communicated with the outside air port P3 and the breathing port P4. Pressurization or negative pressure is generated at the generation port or negative pressure generation port, and the pressurization or negative pressure is alternately applied to the respiratory system.

[0004]

However, the rotary valve mechanism constituting the above-described conventional respiratory vibration generator has the following problems. The valve bodies 53 and 54 of the rotor 51 and the ports P1 to P
From the structural aspect of 4, the air flow path (arrows Ya, Yb, Yc in FIG. 7)
(Refer to (1)) and the output shaft 52 and the air flow path intersect each other.
As a result, the air flow path is disturbed, so that the pressure loss of the air increases and the air flow efficiency deteriorates. Since the pressurization port P1 and the negative pressure port P2 communicate with each other, air leakage increases and the maximum pressure of the pulsation wave of the respiratory vibration generated by switching the pressurization port P1 and the negative pressure port P2. The pressure difference between the minimum pressure and the minimum pressure decreases, and the pulsating wave generation efficiency deteriorates. In this case, FIG.
7 shows pressure waveforms in an inspiration phase (a mode in which air is artificially sent to the lungs of a patient) and an expiratory phase (a mode in which air is artificially removed from the lungs of a patient) in a normal state. Even if the pressurization port P1 or the negative pressure port P2 is shut off when the pressurization or the negative pressure is generated, the air leaks through the outer surface of the valve body on the shutoff port side (see the arrow Yd in FIG. 7). Due to such air leakage, it is not possible to reliably switch between the pressurization mode and the negative pressure mode. Further, since there is no seal between the valve body portions 53 and 54, air leakage easily occurs through the gap between the valve body portions 53 and 54,
The above problems occur. Cylindrical valve body 53, 54 forming a rotary valve mechanism
Is manufactured by cutting or casting, the number of man-hours during cutting and casting is large, so it is not suitable for mass production and the manufacturing cost is high.

[0005]

It is an object of the present invention to improve the disadvantages of the above-mentioned conventional example, and in particular, to generate a proper and efficient pulsation by smoothing the flow of air to suppress pressure loss and preventing air leakage. It is an object of the present invention to provide a respiratory vibration generator for a ventilator that achieves the above.

[0006]

According to the present invention, there is provided a pressure switching mechanism connected between a pressure generating means having a pressurizing port and a negative pressure generating port and a respiratory system connected to the mouth of a patient. In the respiratory vibration generator for an artificial respirator, wherein the respiratory system path is alternately connected to the pressurizing port and the negative pressure generating port, and relatively fast respiratory vibration is applied to the respiratory system path, the pressure switching mechanism, A breathing port connected to the respiratory system path, a pressurizing port connected to the pressurizing port, a negative pressure port connecting to the negative pressure generating port, and both ends having openings. A common air flow path communicating between the parts to the breathing port, a pressurizing air flow path communicating to one opening of the common air flow path and communicating to the pressurizing port, and a common air flow path of the common air flow path. Communicates to the other opening and communicates to the negative pressure port And a negative pressure air flow path, which are arranged at a predetermined interval substantially parallel to the common axis of the common air flow path, the pressurized air flow path, and the negative pressure air flow path, and are rotationally driven by the driving means. The drive shaft and the one opening of the common air flow passage, which is fixed to the outer peripheral portion of the drive shaft, and one opening of the common air flow passage when the drive shaft rotates a predetermined angle. A pressure side slit plate that seals the
A negative pressure side slit which is fixed to the outer peripheral portion of the drive shaft corresponding to the other opening of the common air flow passage and closes the other opening of the common air flow passage when the drive shaft rotates by a predetermined angle. A plate is provided, and the pressurizing-side slit plate and the negative-pressure-side slit plate are arranged such that the phase relationship between the slit plates is shifted by a predetermined angle along the rotational direction of the drive shaft. This is intended to achieve the above-mentioned object.

[0007]

According to the present invention, when the drive shaft is rotated by a predetermined angle by the drive means, the pressurizing side slit plate and the negative pressure side slit plate are rotated by a predetermined angle together with the drive shaft. When the pressurizing side slit plate comes to a position that seals one opening of the common air flow path with a predetermined rotation of the drive shaft, the phase of both slit plates shifts by a predetermined angle along the rotation direction of the drive shaft. Therefore, the negative pressure side slit plate is located apart from the other opening of the common air flow path. As a result, one opening of the common air flow passage is sealed, so that the common air flow passage and the pressurized air flow passage are shut off, and the common air flow passage and the negative pressure air flow passage are in communication with each other. . As a result, air flows from the breathing port through the common air flow path and the negative pressure air flow path to the negative pressure port. Next, when the drive shaft is further rotated by a predetermined angle from the above state by the drive means, the pressurizing side slit plate and the negative pressure side slit plate are rotated by a predetermined angle together with the drive shaft. When the negative pressure side slit plate comes to a position that seals the other opening of the common air flow path with the predetermined rotation of the drive shaft, the phase of both slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft. Therefore, the pressurizing side slit plate comes to a position separated from one opening of the common air passage. As a result, since the other opening of the common air flow passage is sealed, the common air flow passage and the negative pressure air flow passage are shut off, and the common air flow passage and the pressurized air flow passage are brought into communication with each other. . As a result, air flows from the pressurizing port to the breathing port through the pressurizing air passage and the common air passage. Then, the pressure switching mechanism alternately repeats the above-described operations, so that artificial pulsation of respiratory vibrations to be given to the patient occurs.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment to which the respiratory vibration generator for a ventilator of the present invention is applied will be described below with reference to the drawings.

First, the entire system of the ventilator of this embodiment will be described with reference to FIG. 6. The breathing system A of the ventilator includes a common circuit 51, an inspiratory circuit 52 and an expiratory circuit 53. One end of 51 is airtightly connected to the mouth of the patient, while the other end is connected to an inspiration circuit 52 and an exhalation circuit 53. The intake circuit 52 is connected to an oxygen source 54 that stores clean air to be supplied to the patient, and a known flowmeter 55 and a humidifier 56 are connected in the middle of the intake circuit 52. The expiratory circuit 53 is open to the atmosphere, and the opening degree thereof is adjusted by the atmosphere open adjusting valve 57.

To the breathing system A, there is connected a breathing vibration generator B which produces a relatively fast breathing vibration. The breathing vibration generator B includes a blower 58 as a pressure generating unit and a rotary type pressure switching mechanism 1 which will be described later in detail, and the pressurizing and negative pressure generated at the pressurizing port 58 a of the blower 58. The negative pressure generated at the generation port 58b is alternately applied to the vibration circuit 60 by the pressure switching mechanism 1.

The vibrating circuit 60 is connected to the respiratory system A in the vicinity of the connection parts of the common circuit 51, the inspiratory circuit 52, and the expiratory circuit 53. The respiratory system A, that is, the lung H of the patient, vibrates in the vibrating circuit 60. It is designed to be forcibly breathed at a breathing rate according to the number. Further, the vibration circuit 60 includes an electromagnetic variable throttle 61 and a restricting mechanism 62 in order from the pressure switching mechanism 1 side.
Are connected. In the figure, reference numeral 64 is a blower drive motor, and reference numeral 65 is a pressure switching mechanism drive motor.

In this case, when a patient who cannot spontaneously breathe is inhaled by the artificial respirator, the oxygen release source is closed based on the respiratory vibration generated by the respiratory vibration generator by closing the atmosphere opening adjustment valve 57. The oxygen supplied from 54 is sent to the patient's lungs. On the other hand, when the artificial respirator is used to exhale in a patient who cannot spontaneously breathe, by opening the atmosphere opening adjustment valve 57, the patient is exhaled from the lung based on the respiratory vibration generated by the respiratory vibration generator. It is designed to send the generated air to the atmosphere.

The control unit 66 detects the rotation state of the pressure / flow rate sensor 67 for measuring the actual breathing volume of the patient, the rotation sensor 68 for detecting the rotation state of the blower drive motor 54, and the rotation state of the pressure switching mechanism drive motor 55. Signals from the rotation sensor 69, the switch 70 for setting the respiratory rate given to the respiratory system A, the switch 71 for setting the average pressure magnitude of the high frequency vibration given to the respiratory system A, and the switch 72 for setting the respiratory capacity to the patient. Each is input, and a control signal is output to the atmosphere opening adjusting valve 57 and the alarm device 73. In this case, the switches 70 to 72 are arranged in the operating section of the artificial respirator.

Next, the structure of the pressure switching mechanism that constitutes the respiratory vibration generator for a ventilator of this embodiment will be described with reference to FIGS. 1 to 5. The pressure switching mechanism 1 includes the first case portion 2
A, a second case portion 2B, a third case portion 2C, a case 2, a breathing port 3, a pressurizing port 4, a negative pressure port 5, a common chamber 6 communicating with the breathing port 3, and a pressurizing port. 4, a pressurizing chamber 7 communicating with 4, a negative pressure chamber 8 communicating with the negative pressure port 5, and a motor mounting shaft 9 for mounting a motor 65.
And a pair of gears 10 and 11 fixed to the motor mounting shaft 9.
And a pair of slit plates 12 and 13 fixed to the outer circumferences of the gears 10 and 11, respectively.

The structure of the pressure switching mechanism 1 will be described in detail below.
A cylindrical breathing port 3 connected to the vibration circuit 60 of the breathing system A attached to the mouth of the patient is disposed on one end side of the upper portion of the case portion 2A so as to project to the outside of the case. And communicates with the common room 6. A cylindrical pressurizing port 4 connected to the pressurizing port 58a of the blower 58 is disposed on one end side of the upper portion of the second case portion 2B so as to project outward from the case. It communicates with the pressure chamber 7.

A cylindrical negative pressure port 5 connected to the negative pressure generating port 58b of the blower 58 is disposed on one end side of the upper portion of the third case portion 2C so as to project to the outside of the case. And communicates with the negative pressure chamber 8. The pressurizing port 4 and the negative pressure port 5 are arranged on the same side of the case 2, and the breathing port 3 is arranged on the opposite side of the case 2 from the pressurizing port 4 and the negative pressure port 5. The pressurizing port 4 and the negative pressure port 5 are arranged symmetrically with respect to the breathing port 3.

The common chamber 6 is formed as a semi-cylindrical space disposed inside the upper portion of the first case portion 2A, and the pressure chamber 7 is disposed inside the upper portion of the second case portion 2B. The negative pressure chamber 8 is configured as a rectangular parallelepiped space portion provided inside the upper portion of the third case portion 2C. Openings are formed at both ends of the common chamber 6 (a boundary portion between the pressurizing chamber 7 and the negative pressure chamber 8), and the openings are appropriately blocked by a slit plate described later. .

The common chamber 6 communicates with the breathing port 3 via the flow path 3A, and also communicates with the pressurizing port 4 via the pressurizing chamber 7 or the negative pressure port 4 via the negative pressure chamber 8. It has become so. The pressurizing chamber 7 communicates with the pressurizing port 4 and also appropriately communicates with the breathing port 3 via the common chamber 6. The negative pressure chamber 8 communicates with the negative pressure port 5 and also appropriately communicates with the breathing port 3 via the common chamber 6.

A motor mounting shaft 9 rotatably driven by a motor 65 is disposed in the central portion of the first case portion 2A, the second case portion 2B, and the third case portion 2C in a penetrating state. 9 is rotatably supported on the inner peripheral wall portions of the first case portion 2A, the second case portion 2B, and the third case portion 2C via oil seals 14, bearings 15, and bearings 16, respectively. In FIG. 3, reference numeral 9A is a mounting shaft cover, and reference numerals 9B and 9C are spacers.

A gear 10 is fixed to a boundary portion between the first case portion 2A and the second case portion 2B of the motor mounting shaft 9, and a slit plate 12 manufactured by stamping is formed on an outer peripheral portion of the gear 10. Is detachably fixed. A gear 11 is fixed to a boundary portion between the first case portion 2A and the third case portion 2C of the motor mounting shaft 9, and the slit plate 1 manufactured by die-cutting is formed on the outer peripheral portion of the gear 11.
3 is detachably fixed. The gears 10 and 11 rotate together with the slit plates 12 and 13 as the motor mounting shaft 9 rotates.

The slit plate 12 is formed in a substantially semi-circular shape having a size capable of sealing the opening on the pressurizing chamber 7 side in the common chamber 6, and the gear 10 is formed at the center of the slit plate 12. A hole 12A having a shape to be fitted with is formed, and
Teeth (not shown) shaped to engage with the teeth of the gear 10 are formed on the inner peripheral portion of the hole 12A. The slit plate 12 is
It is fixed to the outer peripheral portion of the gear 10 via both teeth.

The slit plate 13 is formed in a substantially semi-circular shape having a size capable of sealing the opening of the common chamber 6 on the negative pressure chamber 8 side, and the gear 11 is formed at the center of the slit plate 13. A hole 13A having a shape to be fitted with is formed,
Teeth (not shown) having a shape that engages with the teeth of the gear 11 are formed on the inner peripheral portion of the hole 13A. The slit plate 13 is
It is fixed to the outer peripheral portion of the gear 11 via both teeth.
In this case, the slit plates 12 and 13 have a phase of 18 to each other.
They are arranged in a state of being shifted by 0 degree.

The slit plates 12 and 13 can pass through at the boundary between the first case 2A and the second case 2B and at the boundary between the first case 2A and the third case 2C. Space portions 17 and 18 are formed respectively. Further, at the boundary between the first case portion 2A and the second case portion 2B and at the boundary portion between the first case portion 2A and the third case portion 2C, the O-ring 1 that enhances the sealing performance between the respective case portions is provided.
9, 20 are provided. Further, the motor mounting shaft 9 is attached to the mounting portion between the end of the first case portion 2A and the motor mounting shaft 9.
An oil seal 21 and an O-ring 22 are provided to enhance the sealing performance during rotation. Reference numeral 23 in FIG. 3 indicates a mounting plate.

When the motor mounting shaft 9 is rotated by the drive of the motor 65 during the operation of the pressure switching mechanism 1, the gear 1
0 and 11 rotate, and the slit plates 12 and 13 also rotate accordingly. Since the slit plates 12 and 13 are arranged with their phases shifted by 180 degrees from each other, when the slit plate 12 is positioned in the space 17 below the first case 2A, the slit plate 13 is It is located in the space 18 in the upper part of the two cases 2A and seals the opening on the negative pressure chamber 8 side of the common chamber 6 (see FIG. 3). As a result, the common chamber 6 and the negative pressure chamber 8 are shut off from each other, and the common chamber 6 and the pressurizing chamber 7 are brought into communication with each other.

On the other hand, since the slit plates 12 and 13 are arranged with their phases shifted from each other by 180 degrees, the slit plate 12 is located above the first case portion 2A in the space portion 17 thereof.
When it is located at, the slit plate 13 is located in the space 18 at the lower part of the second case 2A and seals the opening of the common chamber 6 on the side of the pressurizing chamber 7. As a result, the common chamber 6 and the pressurizing chamber 7 are cut off, and the common chamber 6 and the negative pressure chamber 8 are in communication with each other.

When the common chamber 6 and the pressure chamber 7 are in communication with each other and the common chamber 6 and the negative pressure chamber 8 are in the disconnected state, the pressure port 4 is provided.
The air flows through the pressure chamber 7 and the common chamber 6 to the breathing port 3. This causes pulsation in the inspiration phase (a mode in which air is artificially sent to the lungs of the patient). On the other hand, the common chamber 6 and the negative pressure chamber 8
When and are in communication with each other and the common chamber 6 and the pressurizing chamber 7 are in a shut-off state, air flows from the breathing port 3 through the common chamber 6 and the negative pressure chamber 8 to the negative pressure port 5. There is. This causes pulsation in the expiratory phase (a mode in which air is artificially extracted from the lungs of the patient).

Next, the operation of the pressure switching mechanism which constitutes the respiratory vibration generator for a ventilator of the present embodiment constructed as described above will be explained.

When the motor 65 is driven at a rotational speed corresponding to the respiratory vibration that should be generated by the pressure switching mechanism 1, the motor mounting shaft 9 rotates, and the gears 10 and 11 cause the slit plates 1 to rotate.
It rotates with 2, 13. As the gears 10 and 11 rotate, for example, when the slit plate 12 is located in the space 17 below the first case 2A, the slits 12 and 13 are arranged with their phases shifted by 180 degrees from each other. Therefore, the slit plate 13 is located in the space 18 above the second case 2A (see FIG. 3).

As a result, since the slit plate 13 seals the opening of the common chamber 6 on the negative pressure chamber 8 side, the common chamber 6 and the negative pressure chamber 8 are shut off from each other, and the common chamber 6 and the pressure chamber 7 are separated from each other. Are connected. As a result, air flows from the pressurizing port 4 through the pressurizing chamber 7 and the common chamber 6 to the breathing port 3, so that pulsation occurs in the inspiratory phase (a mode in which air is artificially sent to the lungs of the patient).

Next, when the motor mounting shaft 9 makes a half rotation from the state shown in FIG.
Half turn with 2, 13. When the slit plate 12 is positioned in the space 17 above the first case 2A as the gears 10 and 11 rotate, the slit plates 12 and 13 are arranged with their phases shifted by 180 degrees. For,
The slit plate 13 is located in the space 18 below the second case 2A.

As a result, the slit plate 12 closes the opening of the common chamber 6 on the side of the pressure chamber 7, so that the common chamber 6 and the pressure chamber 7 are shut off from each other, and the common chamber 6 and the negative pressure chamber 8 are separated from each other. Are connected. As a result, air flows from the breathing port 3 through the common chamber 6 and the negative pressure chamber 8 to the negative pressure port 5, so that pulsation occurs in the expiratory phase (a mode in which air is artificially extracted from the lungs of the patient).

That is, the motor 65 is appropriately rotated to rotate the motor mounting shaft 9 and the above-described operation is repeated to connect the breathing port 3 and the pressurizing port 4 to each other and the breathing port 3 and the negative pressure port 5 to each other. By alternating between states, artificial pulsations of respiratory oscillations are created on the patient's lungs.

As described above, according to this embodiment, the slit plate 1 for properly sealing the opening of the common chamber 6 on the pressurizing chamber 7 side.
2 and a slit plate 13 for properly sealing the opening of the common chamber 6 on the negative pressure chamber 8 side, and each slit plate 12, 1
The phases of 3 are set to be 180 degrees out of phase with each other, and the slit plates 12 and 13 are connected to the motor mounting shaft 9 and the gears 10 and 1
Since it is rotated via 1, the pressurizing chamber 7 and the common chamber 6
The negative pressure chambers 8 and the negative pressure chambers 8 can be accurately and alternately communicated (switched). As a result, the pressure difference between the maximum pressure and the minimum pressure of the pulsating wave of the respiratory vibration generated in the pressure switching mechanism 1 can be increased as shown in FIG. 7, so that proper pulsation can be generated.

Further, according to this embodiment, since the pressurizing chamber 7 and the negative pressure chamber 8 are completely isolated from each other by the slit plates 12 and 13 and the oil seal 14, air leakage as in the prior art is prevented. Can be reliably prevented, and as a result, the pulsation generation efficiency can be improved.

Further, according to the present embodiment, the air passage formed by the common chamber 6, the pressurizing chamber 7 and the negative pressure chamber 8 and the motor mounting shaft 9 are completely separated from each other. As compared with the case where the motor mounting shaft is arranged in the air flow path as described above, it becomes possible to form a smooth air flow path without disturbing the air flow path by the motor mounting shaft. It is possible to suppress pressure loss and improve air circulation efficiency. In addition, the pressure port 4, pressure chamber 7,
Since the air flow path formed by the common chamber 6 and the breathing port 3, the air flow path formed by the breathing port 3, the common chamber 6, the negative pressure chamber 8 and the negative pressure port 5 can be reduced, There is no extreme bend in the air flow path like
Air can be circulated smoothly.

Further, according to this embodiment, the slit plate 1
Since 2 and 13 are manufactured by die-cutting, the valve body (slit plate 12,
13) is suitable for mass production and the manufacturing cost can be reduced.

Furthermore, according to this embodiment, the gears 10,
Since the slit plates 12 and 13 are detachably attached to the gear 11, the gears 10 and 11 and the slit plates 12 and 1 are
If the meshing position with 3 is appropriately shifted, the timing (pulsation cycle) at which the state in which the breathing port 3 and the pressurizing port 4 communicate with each other and the state in which the breathing port 3 and the negative pressure port 5 communicate with each other are alternately switched. It is possible to change.

In this case, in this embodiment, if the areas of the slit plates 12 and 13 for properly sealing the opening of the common chamber 6 on the side of the pressurizing chamber 7 and the opening on the side of the negative pressure chamber 8 are changed, the breathing port 3 can be obtained.
It is possible to appropriately change the opening / closing time of the pressurizing port 4 and the negative pressure port 5 with respect to.

[0039]

As described above, according to the respiratory vibration generator for a ventilator of the present invention, the common air passage communicating with the breathing port, the one opening of the common air passage and the pressurizing port are connected. A common air flow path, a pressurized air flow path, and a negative pressure air flow path, which are provided with a pressurized air flow path communicating with each other and a negative pressure air flow path communicating with the other opening of the common air flow path and the negative pressure port. Pressurizing side slit plate that seals one opening of the common air passage and the negative pressure side that seals the other opening of the common air passage by arranging the drive shafts at a predetermined interval substantially parallel to the common axis of Since the slit plate is fixed to the drive shaft and the phase relationship between both slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft, the pressurized air flow path and the negative pressure air flow with respect to the common air flow path. The roads can be communicated with each other accurately and alternately,
It becomes possible to form a smooth air flow path without being disturbed by the rotation of the drive shaft, and as a result, it is possible to suppress the pressure loss of the air and improve the air circulation efficiency. Therefore, it is possible to produce an effect that appropriate pulsation of respiratory vibration can be generated. When the pressurizing-side slit plate and the negative-pressure-side slit plate are detachably fixed to the drive shaft via gears, the breathing port and pressurizing port can be communicated by appropriately shifting the meshing position of both slit plates and gears. There is an effect that the timing (pulsation cycle) at which the switching state and the communication state of the breathing port and the negative pressure port are alternately switched can be changed. Furthermore, when the pressurizing port and the negative pressure port are arranged on the same side with respect to the common air flow path and the breathing port is arranged on the opposite side of the common air flow path from the pressurizing port and the negative pressure port. Is an air flow formed by a pressurization port, a pressurization air flow path, a common air flow path and a breathing port, a breathing port, a common air flow path, a negative pressure air flow path and a negative pressure port. Since the bend in the road can be reduced, the air can be circulated smoothly. Furthermore, when the portions of the pressurized air passage and the negative pressure air passage that communicate with both openings of the common air passage are sealed to the outside, air leakage from both air passages is prevented. Therefore, there is an effect that the pulsation generation efficiency of respiratory vibration can be improved.

[Brief description of drawings]

FIG. 1 is a front view of a pressure switching mechanism according to an embodiment of the present invention.

FIG. 2 is a right side view of the pressure switching mechanism shown in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

4 is a cross-sectional view taken along the line BB of FIG.

5 is a schematic perspective view of the pressure switching mechanism shown in FIG.

FIG. 6 is a schematic block diagram showing an entire system of the artificial respirator according to the present embodiment.

FIG. 7 is a schematic perspective view of a conventional pressure switching mechanism.

FIG. 8 is an explanatory diagram of pressure waveforms in an inspiratory phase and an expiratory phase.

[Explanation of symbols]

 1 Pressure Switching Mechanism 2 Case 2A 1st Case Section 2B 2nd Case Section 2C 3rd Case Section 3 Breathing Port 4 Pressurizing Port 5 Negative Pressure Port 6 Common Room as Common Air Flow Path 7 Pressurizing as Air Flow Path Pressure chamber 8 Negative pressure chamber as negative pressure air passage 9 Motor mounting shaft as drive shaft 10, 11 Gear 12 Slit plate as pressurizing side slit plate 13 Slit plate as negative pressure side slit plate 14 Oil seal 58 Pressure generating means Blower 58a Pressurizing port 58b Negative pressure generating port 65 Pressure switching mechanism driving motor

Claims (5)

[Claims] 1. A pressure switching mechanism connected between a pressure generating means having a pressurization generating port and a negative pressure generating port and a respiratory system passage connected to the mouth of a patient. In a respiratory vibration generator for a ventilator, which alternately communicates with a generation port and the negative pressure generation port, and which gives a relatively quick respiratory vibration to the respiratory system path, the pressure switching mechanism is connected to the respiratory system path. A breathing port, a pressurizing port connected to the pressurizing port, a negative pressure port connecting to the negative pressure generating port, and an opening at both ends, and a space between the both ends to the breathing port. A communicating common air flow path, a pressurized air flow path communicating with one opening of the common air flow path and communicating with the pressurizing port, and communicating with the other opening of the common air flow path And a negative pressure air flow path communicating with the negative pressure port. Said common air passage, while being arranged at predetermined intervals substantially parallel to the common axis of the pressurized air passage and negative air flow path,
The drive shaft rotationally driven by the drive means and the common air flow passage are fixed to the outer peripheral portion of the drive shaft corresponding to one opening of the common air flow passage, and the common air flow passage is rotated at a predetermined angle of the drive shaft. The pressurizing side slit plate that seals one opening of the drive shaft is fixed to the outer peripheral portion of the drive shaft corresponding to the other opening of the common air flow path, and the common side is provided when the drive shaft is rotated by a predetermined angle. It comprises a negative pressure side slit plate for sealing the other opening of the air flow path, the pressurizing side slit plate and the negative pressure side slit plate, the phase relationship between the two slit plates along the rotation direction of the drive shaft. And a breathing vibration generator for a ventilator, wherein the breathing vibration generator is arranged at a predetermined angle. 2. The pressurizing side slit plate and the negative pressure side slit plate are arranged in a state in which the phase relationship between the two slit plates is shifted by 180 degrees along the rotational direction of the drive shaft. Item 1. A respiratory vibration generator for a ventilator according to Item 1. 3. The respiratory vibration generator for a ventilator according to claim 1, wherein the pressurizing side slit plate and the negative pressure side slit plate are detachably fixed to the drive shaft via a gear. apparatus. 4. The pressurizing port and the negative pressure port are arranged on the same side with respect to the common air flow path, and the breathing port is provided with the pressurizing port and the negative pressure port with respect to the common air flow path. Is arranged on the opposite side. The respiratory vibration generator for a ventilator according to claim 1, 2 or 3, wherein. 5. A structure in which the pressurizing air flow path and the negative pressure air flow path are connected to both openings of the common air flow path in a sealed structure with respect to the outside. 1,
2. A respiratory vibration generator for a respirator according to 2, 3, or 4.