JP3269178B2 - Respiratory vibration generator for artificial respirators - Google Patents

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 an artificial respirator, and more particularly to a respiratory vibration generator for an artificial respirator suitable for generating a 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 Publication No. 63-283916, a respiratory vibration generator is constituted by a blower and a rotary valve mechanism, and a respiratory vibration is generated by a rotary valve mechanism connected between the blower and a respiratory system. A ventilator has been proposed in which a path is alternately communicated with a pressure generating port and a negative pressure generating port of a blower, and a relatively fast respiratory vibration is applied to a respiratory path.

In a conventional rotary valve mechanism, as shown in FIG. 7, a pair of valve bodies 53, which extend a rotor 51 so as to be separated from each other in an axial direction of an output shaft 52 of a motor (not shown), are provided.
54 constitute a rotary valve mechanism 50, and the valve body portions 53, 5
4 has a cylindrical member which is coaxial with the output shaft 52 and is partially cut away. In the respiratory vibration generating device, the rotor 51 is rotated by the motor, and the pressurized port P1 or the negative pressure port P2 connected to the blower is alternately connected to the outside air port P3 and the respiratory port P4, so that the pressurized vibration is generated. A pressurized or negative pressure is generated at the generating port or the negative pressure generating port, and the pressurized or negative pressure is alternately applied to the respiratory tract.

[0004]

However, the rotary valve mechanism constituting the above-mentioned conventional respiratory vibration generator has the following problems. Valve parts 53 and 54 of the rotor 51 and respective ports P1 to P
4 through the air flow path (arrows Ya, Yb, Yc in FIG. 7).
), The output shaft 52 and the air passage intersect with 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. Due to the structure in which the pressurized port P1 and the negative pressure port P2 communicate with each other, air leakage increases and the maximum pressure of the pulsation wave of respiratory vibration generated by switching between the pressurized port P1 and the negative pressure port P2. The pressure difference between the pressure and the minimum pressure becomes small, and the efficiency of generating the pulsating wave deteriorates. In this case, FIG.
The pressure waveform in the inspiratory phase (mode in which air is artificially sent to the lungs of the patient) and the expiratory phase (mode in which air is artificially extracted from the lungs of the patient) in a normal state are shown. Even if the pressurized port P1 or the negative pressure port P2 is shut off when a pressurized or negative pressure is generated, air leaks through the outer surface of the valve body on the shutoff port side (see arrow Yd in FIG. 7). Due to such air leakage, it is not possible to reliably switch between the pressurized mode and the negative pressure mode. Further, since there is no seal between the valve bodies 53 and 54, air leakage easily occurs through the gap between the valve bodies 53 and 54,
The above problem occurs. Cylindrical valve bodies 53 and 54 constituting a rotary valve mechanism
Since is manufactured by cutting or casting, the number of man-hours at the time of cutting or casting increases, so that it is not suitable for mass production and the manufacturing cost is high.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to improve the disadvantages of the above prior art, and in particular to generate a proper and efficient pulsation by smoothing the flow of air to suppress pressure loss and prevent air leakage. It is an object of the present invention to provide a respiratory vibration generator for a ventilator that achieves the above.

[0006]

SUMMARY OF THE INVENTION The present invention provides a pressure switching mechanism connected between a pressure generating means having a pressurized pressure generating port and a negative pressure generating port and a respiratory system connected to the mouth of a patient. In a respiratory vibration generator for a respirator that alternately communicates the respiratory path with the pres sure generating port and the negative pressure generating port to apply relatively quick respiratory vibration to the respiratory path, the pressure switching mechanism may include: A breathing port connected to the respiratory tract, a pressurized port connected to the pressurized pressure generating port, a negative pressure port connected to the negative pressure generated port, and an opening at both ends and both ends A common air passage communicating between the portions to the breathing port, a pressurized air passage communicating with one opening of the common air passage and communicating with the pressurized port, Communicates with the other opening and communicates with the negative pressure port A negative pressure air flow path, which is disposed at a predetermined interval substantially parallel to a common axis of the common air flow path, the pressurized air flow path, and the negative pressure air flow path, and is rotationally driven by driving means. The drive shaft is fixed to an outer peripheral portion of the drive shaft corresponding to one opening of the common air passage, and the one opening of the common air passage is rotated when the drive shaft rotates by a predetermined angle. Pressurized side slit plate to seal the
A negative pressure side slit fixed to the outer peripheral portion of the drive shaft corresponding to the other opening of the common air flow passage and sealing the other opening of the common air flow passage when the drive shaft rotates by a predetermined angle; A plate is provided, and the pressurized side slit plate and the negative pressure side slit plate are arranged so that the phase relationship between the two slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft. This aims 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 pressurized side slit plate and the negative pressure side slit plate rotate together with the drive shaft by a predetermined angle. With the predetermined rotation of the drive shaft, when the pressurized side slit plate comes to a position that seals one opening of the common air flow path, the phase of both slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft. Therefore, the negative pressure side slit plate is located at a position separated from the other opening of the common air flow path. Thereby, since one opening of the common air flow path is sealed, the common air flow path and the pressurized air flow path are cut off, and the common air flow path and the negative pressure air flow path are connected. . As a result, air flows from the breathing port to the negative pressure port through the common air flow path and the negative pressure air flow path. Next, when the drive shaft is further rotated by a predetermined angle from the above-described state by the drive means, the pressurized side slit plate and the negative pressure side slit plate rotate together with the drive shaft by a predetermined angle. With the predetermined rotation of 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, the phase of both slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft. Therefore, the pressurized side slit plate comes to a position separated from one opening of the common air flow path. Thereby, the other opening of the common air flow path is sealed, so that the common air flow path and the negative pressure air flow path are cut off, and the common air flow path and the pressurized air flow path are connected. . As a result, air flows from the pressurized port to the breathing port through the pressurized air flow path and the common air flow path. Then, the above operation is alternately repeated by the pressure switching mechanism, whereby artificial pulsation of respiratory vibration to be given to the patient is generated.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a respiratory vibration generator for a respirator according to the present invention.

First, the overall system of the ventilator according to the present embodiment will be described with reference to FIG. 6. The respiratory system A of the ventilator includes a common circuit 51, an inspiration circuit 52, and an expiration 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 expiration circuit 53. The inspiratory circuit 52 is connected to an oxygen source 54 storing clean air to be supplied to the patient, and a known flow meter 55 and a humidifier 56 are connected on the way. The exhalation circuit 53 is open to the atmosphere, and the degree of opening is adjusted by an air release adjusting valve 57.

The respiratory system A is connected to a respiratory vibration generator B for generating respiratory vibrations that are relatively fast. The respiratory vibration generator B includes a blower 58 as a pressure generating means and a rotary pressure switching mechanism 1 described later in detail, and pressurized and negative pressure generated at a pressurized pressure generating port 58a of the blower 58. The negative pressure generated at the generation port 58 b is alternately applied to the vibration circuit 60 by the pressure switching mechanism 1.

The oscillating circuit 60 is connected to the respiratory system A near the connection between the common circuit 51, the inspiratory circuit 52, and the expiratory circuit 53. Breathing is forcibly performed at the respiratory rate according to the number. The vibration circuit 60 includes an electromagnetic variable throttle 61 and a regulating mechanism 62 sequentially from the pressure switching mechanism 1 side.
Is connected. In the figure, reference numeral 64 denotes a blower driving motor, and reference numeral 65 denotes a pressure switching mechanism driving motor.

In this case, when a patient who cannot breathe spontaneously is inhaled by a ventilator, the air release adjusting valve 57 is closed, and an oxygen source is generated based on respiratory vibration generated by the respiratory vibration generator. The oxygen supplied from 54 is sent to the lungs of the patient. On the other hand, when a patient who cannot breathe spontaneously performs an exhalation operation using a ventilator, the air release adjusting valve 57 is opened to discharge the patient's lungs based on the respiratory vibration generated by the respiratory vibration generator. The air is sent to the atmosphere.

The control unit 66 detects a rotation state of the pressure / flow rate sensor 67 for measuring the actual respiratory volume of the patient, a rotation state of the blower driving motor 54, and a rotation state of the pressure switching mechanism driving motor 55. From a rotation sensor 69, a switch 70 for setting the respiratory rate to be applied to the respiratory system A, a switch 71 for setting the average pressure of the high frequency vibration applied to the respiratory system A, and a switch 72 for setting the respiratory capacity to the patient. The control signals are output to the air release control valve 57 and the alarm 73, respectively. In this case, the switches 70 to 72 are arranged on the operation unit of the respirator.

Next, the structure of the pressure switching mechanism constituting the respiratory vibration generator for a respirator according to the present embodiment will be described with reference to FIGS. 1 to 5. The pressure switching mechanism 1 is composed of a first case 2
A, a case 2 including a second case portion 2B and a third case portion 2C, a breathing port 3, a pressurized port 4, a negative pressure port 5, a common chamber 6 communicating with the breathing port 3, and a pressurized port. 4, a negative pressure chamber 8 communicating with the negative pressure port 5, and a motor mounting shaft 9 for mounting the 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 peripheral portions of the gears 10 and 11, respectively.

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

At one end of the upper part of the third case portion 2C, a cylindrical negative pressure port 5 connected to the negative pressure generating port 58b of the blower 58 is disposed so as to protrude outward from the case. And communicates with the negative pressure chamber 8. The pressurizing port 4 and the negative pressure port 5 are disposed on the same side with respect to the case 2, and the breathing port 3 is disposed on the opposite side of the case 2 with 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 configured as a semicylindrical space disposed inside the upper part of the first case 2A, and the pressurized chamber 7 is disposed inside the upper part of the second case 2B. The negative pressure chamber 8 is configured as a rectangular parallelepiped space disposed inside the upper portion of the third case portion 2C. Openings are formed at both ends of the common chamber 6 (boundary portions between the pressurized chambers 7 and the negative pressure chambers 8), and the slits described later are adapted to appropriately block the openings. .

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 as appropriate. It has become so. The pressurizing chamber 7 communicates with the pressurizing port 4 and also communicates with the breathing port 3 via the common chamber 6 as appropriate. The negative pressure chamber 8 communicates with the negative pressure port 5 and also communicates with the breathing port 3 via the common chamber 6 as appropriate.

At the center of the first case 2A, the second case 2B, and the third case 2C, a motor mounting shaft 9 driven to rotate by a motor 65 is provided so as to pass therethrough. Numeral 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 an oil seal 14, a bearing 15, and a bearing 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 provided on an outer peripheral portion of the gear 10. Are 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 a slit plate 1 manufactured by stamping is provided on an outer peripheral portion of the gear 11.
3 is detachably fixed. The gears 10 and 11 rotate 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 of the common chamber 6 on the side of the pressurizing chamber 7. And a hole 12A having a shape that fits with
On the inner peripheral portion of the hole 12A, teeth (not shown) having a shape to be engaged with the teeth of the gear 10 are formed. The slit plate 12
The gear 10 is fixed to the outer peripheral portion 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 a hole 13A having a shape that fits with
On the inner peripheral portion of the hole 13A, teeth (not shown) having a shape engaging with the teeth of the gear 11 are formed. The slit plate 13
The gear 11 is fixed to the outer peripheral portion via both teeth.
In this case, the slit plates 12 and 13 have a phase of 18
It is arranged in a state shifted by 0 degrees.

The slit plates 12, 13 during rotation can pass through the boundary between the first case 2A and the second case 2B and the boundary between the first case 2A and the third case 2C. Space portions 17 and 18 are respectively formed. O-rings 1 are provided at the boundary between the first case part 2A and the second case part 2B and at the boundary between the first case part 2A and the third case part 2C to enhance the sealing between the case parts.
9, 20 are provided. Further, a motor mounting shaft 9 is provided at a 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 for improving the sealing performance during rotation are provided. Reference numeral 23 in FIG. 3 indicates a mounting plate.

During operation of the pressure switching mechanism 1, when the motor mounting shaft 9 rotates by driving the motor 65, the gear 1
0 and 11 rotate, and the slit plates 12 and 13 rotate accordingly. Since the slit plates 12 and 13 are arranged with their phases shifted from each other by 180 degrees, when the slit plate 12 is located in the space 17 below the first case portion 2A, the slit plate 13 is The opening of the common chamber 6 on the side of the negative pressure chamber 8 is sealed in the space 18 above the two case 2A (see FIG. 3). As a result, the common chamber 6 and the negative pressure chamber 8 are cut off, and the common chamber 6 and the pressurized chamber 7 are connected.

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.
, The slit plate 13 is located in the space portion 18 below the second case portion 2A and seals the opening of the common chamber 6 on the pressurizing chamber 7 side. As a result, the common chamber 6 and the pressurized chamber 7 are cut off, and the common chamber 6 and the negative pressure chamber 8 are connected.

When the common chamber 6 and the pressurized chamber 7 are in communication with each other and the common chamber 6 and the negative pressure chamber 8 are in a cutoff state, the pressurized port 4
Then, air flows through the pressurizing chamber 7 and the common chamber 6 to the breathing port 3. As a result, pulsation occurs in the inspiratory phase (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
Are in communication with each other, and when the common chamber 6 and the pressurized chamber 7 are shut off, air flows from the breathing port 3 to the negative pressure port 5 through the common chamber 6 and the negative pressure chamber 8. I have. As a result, pulsation occurs in the expiration phase (mode in which air is artificially extracted from the lungs of the patient).

Next, the operation of the pressure switching mechanism constituting the respiratory vibration generator for a ventilator of the present embodiment configured as described above will be described.

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

Since the slit plate 13 seals the opening of the common chamber 6 on the side of the negative pressure chamber 8, the common chamber 6 and the negative pressure chamber 8 are cut off, and the common chamber 6 and the pressurized chamber 7 are closed. Becomes a communication state. As a result, air flows from the pressurized port 4 to the respiratory port 3 through the pressurized chamber 7 and the common chamber 6, so that pulsation occurs in the inspiratory phase (mode in which air is artificially sent to the lungs of the patient).

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

As a result, since the slit plate 12 seals the opening of the common chamber 6 on the side of the pressurized chamber 7, the common chamber 6 and the pressurized chamber 7 are cut off, and the common chamber 6 and the negative pressure chamber 8 are closed. Becomes a communication state. As a result, since air flows from the breathing port 3 to the negative pressure port 5 through the common chamber 6 and the negative pressure chamber 8, pulsation occurs in the expiration phase (mode in which air is artificially extracted from the patient's lung).

That is, the operation described above is repeated by appropriately rotating the motor mounting shaft 9 by the motor 65, and the state in which the breathing port 3 and the pressurized port 4 are communicated, and the state in which the breathing port 3 and the negative pressure port 5 are communicated. By alternately switching between states, a pulse of artificial respiratory vibration to the patient's lungs is formed.

As described above, according to the present embodiment, the slit plate 1 for appropriately sealing the opening of the common chamber 6 on the pressurizing chamber 7 side.
2 and a slit plate 13 for appropriately closing the opening of the common chamber 6 on the side of the negative pressure chamber 8, and each slit plate 12, 1
3 are shifted from each other by 180 degrees, and the slit plates 12 and 13 are connected to the motor mounting shaft 9 and the gears 10 and 1 respectively.
1 through the pressurizing chamber 7 relative to the common chamber 6
And the negative pressure chamber 8 can be accurately and alternately communicated (switched). As a result, the differential pressure between the maximum pressure and the minimum pressure of the pulsation wave of the respiratory vibration generated by the pressure switching mechanism 1 can be increased as shown in FIG. 7, so that an appropriate pulsation can be generated.

Further, according to the present embodiment, since the pressurized chamber 7 and the negative pressure chamber 8 are completely separated from each other through the slit plates 12, 13 and the oil seal 14, the conventional air leakage Can be reliably prevented, and as a result, pulsation generation efficiency can be improved.

Further, according to the present embodiment, since the air passage formed by the common chamber 6, the pressurized 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, and as a result, Pressure loss can be suppressed, and air circulation efficiency can be improved. Further, the pressurized port 4, the pressurized chamber 7,
Since the air flow path formed by the common chamber 6 and the breathing port 3 and 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 in bending, As shown in the figure, there is no extreme bending in the air flow path,
Air can be circulated smoothly.

Further, according to the present embodiment, the slit plate 1
Since the valves 2 and 13 are manufactured by die punching, the valve bodies (slit plates 12 and
13) is suitable for mass production and the manufacturing cost can be reduced as compared with the case of manufacturing the same.

Furthermore, according to the present embodiment, the gears 10,
The gears 10 and 11 and the slit plates 12 and 1 have a structure in which the slit plates 12 and 13 are detachably attached to the gear 11.
If the position of engagement with the port 3 is appropriately shifted, the timing (pulsation cycle) at which the state in which the breathing port 3 communicates with the pressurized port 4 and the state in which the breathing port 3 communicates with the negative pressure port 5 are alternately switched is set. It can be changed.

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 pressurized chamber 7 and the opening of the common chamber 6 on the side of the negative pressure chamber 8 are changed,
The opening / closing time of the pressurizing port 4 and the negative pressure port 5 can be appropriately changed.

[0039]

As described above, according to the respiratory vibration generating apparatus 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 pressurized port are provided. A common air flow path, a pressurized air flow path, and a negative pressure air flow path, each of which includes a pressurized air flow path that communicates with the negative pressure air flow path that communicates with the other opening of the common air flow path and the negative pressure port. A drive shaft is arranged at a predetermined interval substantially in parallel with the common axis of the slit, and a pressurized side slit plate for sealing one opening of the common air passage and a negative pressure side for sealing the other opening of the common air passage. The slit plate is fixed to the drive shaft, and the phase relationship between the two slit plates is shifted by a predetermined angle along the rotation direction of the drive shaft. The roads can be accurately and alternately connected,
Since the air flow path can form a smooth air flow path without being disturbed by the rotation of the drive shaft, as a result, the pressure loss of air can be suppressed and the air flow efficiency can be improved. It is possible to produce an effect that an appropriate pulsation of respiratory vibration can be generated. In addition, when the pressurized side slit plate and the negative pressure side slit plate are detachably fixed to the drive shaft via a gear, if the meshing positions of both slit plates and the gear are appropriately shifted, the breathing port and the pressurized port are connected. There is an effect that the timing (pulsation cycle) of alternately switching between the state in which the communication is performed and the state in which the breathing port and the negative pressure port are communicated can be varied. Further, when the pressurized 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 with respect to the pressurized port and the negative pressure port. The air flow formed by the pressurized port, the pressurized air flow path, the common air flow path and the breathing port, the air flow formed by the breathing port, the common air flow path, the negative pressure air flow path and the negative pressure port Since the bend in the road can be reduced, there is an effect that air can be smoothly circulated. Furthermore, when the portions communicating with both openings of the common air flow path in the pressurized air flow path and the negative pressure air flow path are sealed to the outside, air leakage from both air flow paths is prevented. Therefore, there is an effect that the generation efficiency of pulsation of respiratory vibration can be improved.

[Brief description of the 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.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

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

FIG. 6 is a schematic block diagram showing the entire system of the respirator in 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]

 DESCRIPTION OF SYMBOLS 1 Pressure switching mechanism 2 Case 2A 1st case part 2B 2nd case part 2C 3rd case part 3 Breathing port 4 Pressurization port 5 Negative pressure port 6 Common chamber as common air flow path 7 Application as pressurized 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 pressurized side slit plate 13 Slit plate as negative pressure side slit plate 14 Oil seal 58 Pressure generating means 58a Pressurizing port 58b Negative pressure port 65 Motor for driving pressure switching mechanism as driving means

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A61M 16/00-16/20

Claims (5)

(57) [Claims] 1. A pressure switching mechanism connected between a pressure generating means having a pressurized pressure generating port and a negative pressure generating port and a respiratory system connected to a mouth of a patient. In a respiratory vibration generator for a ventilator that alternately communicates with a generating port and the negative pressure generating port to apply relatively quick respiratory vibration to the respiratory system, the pressure switching mechanism is connected to the respiratory system A breathing port, a pressurized port connected to the pressurized pressure generating port, a negative pressure port connected to the negative pressure generated port, and an opening at both ends and a portion between the both ends connected to the breathing port. A communicating pressurized air flow passage communicating with the common air flow passage, one opening of the common air flow passage and the pressurizing port, and communicating with the other opening of the common air flow passage; A negative pressure air flow passage 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,
A drive shaft rotatably driven by a driving means, and fixed to an 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 when the drive shaft rotates by a predetermined angle. A pressurized side slit plate that seals one opening of the drive shaft and an outer peripheral portion of the drive shaft corresponding to the other opening of the common air flow path; A negative pressure side slit plate for sealing the other opening of the air flow path, wherein the pressurized side slit plate and the negative pressure side slit plate are arranged so that the phase relationship between the two slit plates is along the rotation direction of the drive shaft. A respiratory vibration generator for a ventilator, wherein the respiratory vibration generator is arranged in a state shifted by a predetermined angle. 2. The apparatus according to claim 1, wherein said pressurized side slit plate and said negative pressure side slit plate are arranged such that a phase relationship between said slit plates is shifted by 180 degrees along a rotation direction of said drive shaft. Item 7. A respiratory vibration generator for an artificial respirator according to Item 1. 3. The respiratory vibration generator according to claim 1, wherein said pressurized side slit plate and said negative pressure side slit plate are detachably fixed to said drive shaft via a gear. apparatus. 4. The pressurized 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 connected with the pressurized port and the negative pressure port with respect to the common air flow path. The respiratory vibration generator for a respirator according to claim 1, 2 or 3, which is disposed on the opposite side. 5. A structure in which the pressurized air flow path and the negative pressure air flow path are connected to both openings of the common air flow path and have a sealed structure with respect to the outside. 1,
5. The respiratory vibration generator for a respirator according to 2, 3, or 4.