WO2016140181A1

WO2016140181A1 - Suction device

Info

Publication number: WO2016140181A1
Application number: PCT/JP2016/056026
Authority: WO
Inventors: 東山　祐三
Original assignee: 株式会社村田製作所
Priority date: 2015-03-03
Filing date: 2016-02-29
Publication date: 2016-09-09
Also published as: JP6536669B2; JPWO2016140181A1

Abstract

Provided is a suction device capable of stopping the adsorbing state of a suction tube tip by stopping the driving of a pump. The suction device is provided with the following: a blower unit that includes an exhaust flow path having an exhaust opening and an intake opening, and a piezoelectric blower provided in the middle of the exhaust flow path; and a drainage container that includes a storage chamber having a flow entry port and a negative pressure port, wherein the flow entry port communicates with the negative pressure port.

Description

Suction device

The present invention relates to a suction device for sucking patient's saliva and the like.

For example, a medical suction device that continuously sucks secretions such as saliva collected in the upper part of the tracheal tube cuff or in the oral cavity has an electric pump that generates suction pressure and a drainage container that stores drainage. ing. Examples of such a suction device include an electric low-pressure continuous suction device provided with an electric pump disclosed in Japanese Patent Laid-Open No. 2000-60962 (Patent Document 1).

JP 2000-60962 A

The electric pump used in the conventional suction device basically changes the volume of the pump chamber periodically by a drive source (motor, electromagnet, piezoelectric body, etc.) and sends air in only one direction by a check valve. It is configured as follows. For this reason, air flows in the suction direction, but air does not flow in the reverse direction.

Therefore, if the tip of the suction tube is adsorbed to the tracheal mucosa or oral mucosa during suction, the inside of the drainage container is maintained at a negative pressure even after the pump is stopped. There was a problem that the adsorbed state could not be released and there was a risk of mucosal damage.

Although Patent Document 1 describes that it is necessary to provide a pressure detection means for maintaining the suction pressure appropriately, even if the pressure detection means is provided, air flows in a direction opposite to the suction direction. Without this, the suction state at the tip of the suction tube cannot be released.

In view of the above problems, an object of the present invention is to provide a suction device capable of releasing the suction state at the tip of the suction pipe by stopping the driving of the pump.

[1] An exhaust channel having an exhaust port and an intake port, and a blower unit including a piezoelectric blower provided in the middle of the exhaust channel;
A drainage vessel including a reservoir having an inlet and a negative pressure port;
A suction device in which the intake port and the negative pressure port communicate with each other.

[2] The intake port and the negative pressure port communicate with each other through a connection flow path.
The suction device according to [1], wherein the connection flow path is separated into a plurality of flow paths by at least one flow velocity attenuation unit.

[3] The distance of the shortest path from the negative pressure port to the intake port via the connection flow path is longer than a linear distance between the negative pressure port and the intake port. Suction device.

[4] The suction device according to any one of [1] to [3], wherein the negative pressure port has a hydrophobic filter.

[5] The distance of the shortest path from the intake port to the exhaust port via the exhaust passage of the blower unit is longer than the linear distance between the intake port and the exhaust port. [4] The suction device according to any one of [4].

[6] The suction device according to any one of [1] to [5], wherein the exhaust port has a connector.

[7] The blower unit has a suction port communicating with the inflow port of the drainage container,
The blower unit and the drainage container are mounted so that the centers of the suction port of the blower unit and the inflow port of the drainage container coincide with each other.
A mounting portion between the blower unit and the drainage container includes a first annular portion centered on the center of the inlet and the suction port, and a second concentric circle with the first annular portion. And a ring-shaped part of
The first ring-shaped portion has a larger diameter than the suction port and the inflow port, the second ring-shaped portion has a larger diameter than the first ring-shaped portion,
The suction device according to any one of [1] to [6], wherein the negative pressure port and the intake port are located outside the first annular portion and inside the second annular portion.

[8] The suction device according to any one of [1] to [7], wherein the blower unit and the drainage container are removable.

[9] A circuit unit is further provided.
The suction device according to any one of [1] to [8], wherein the circuit unit includes a power source and a control unit that controls driving of the piezoelectric blower.

[10] The suction device according to [9], wherein the control unit can drive the piezoelectric blower intermittently.

[11] The suction device according to [9] or [10], wherein the circuit unit is removable.

According to the present invention, it is possible to provide a suction device capable of releasing the suction state at the tip of the suction pipe by stopping the driving of the pump.

It is a block diagram which shows roughly the structure of the principal part of the suction device of Embodiment 1. It is a block diagram showing roughly the whole composition of an example of the suction device of Embodiment 1. It is a perspective view which shows the structure of an example of the suction device of Embodiment 1. FIG. It is a partial exploded perspective view showing the composition of an example of the suction device of Embodiment 1. FIG. 3 is a partially exploded perspective sectional view illustrating a configuration of an example of the suction device according to the first embodiment. It is sectional drawing which shows the structure of an example of the suction device of Embodiment 1. FIG. 7 is a cross-sectional view taken along the line C-C ′ of FIG. FIG. 7 is a cross-sectional view taken along the line B-B ′ of FIG. (A) is a top view of the drainage container 11 in an example of the suction device of Embodiment 1. FIG. FIG. 4B is a bottom view of the blower unit 12 in the example of the suction device according to the first embodiment. FIG. 3 is a cross-sectional view illustrating a configuration of a piezoelectric blower used in the suction device according to the first embodiment. (A) is a schematic diagram which shows an example of the tracheal tube with a cuff provided with the suction device of Embodiment 1. FIG. (B) is the schematic diagram which expands and shows the front-end | tip part of the cuffed tracheal tube shown to (a). (C) is a sectional view taken along the line A-A ′ of (b). It is a schematic diagram which shows a mode that the tracheal tube was inserted in the trachea from the oral cavity. It is a schematic diagram which shows the whole structure of the modification of the suction device of Embodiment 1.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals represent the same or corresponding parts. In addition, dimensional relationships such as length, width, thickness, and depth are changed as appropriate for clarity and simplification of the drawings, and do not represent actual dimensional relationships. In addition, embodiment is an illustration and it cannot be overemphasized that the partial substitution or combination of the structure shown with the different form is possible.

The suction device of the present embodiment is a suction device for continuously sucking secretions such as saliva collected in the upper part of the tracheal tube cuff or in the oral cavity, for example, a blower unit 12 that generates suction pressure, and drainage And a drainage container 11 for storing (aspirated secretions and the like). First, before describing the details of the suction device, the usage pattern of the suction device of the present embodiment will be described.

FIG. 12 is a schematic diagram showing a state in which the tracheal tube 8 is inserted into the trachea 91 from the oral cavity 94. When an airway is secured by tracheal intubation when using a ventilator, a tracheal tube (intratracheal tube, intubation tube) 8 is inserted from the oral cavity 94 of the subject into the trachea 91. At this time, since the epiglottis 93 is always opened, secretions such as saliva flow into the trachea 91 from the gap between the inserted tracheal tube 8 and the inner wall 91a of the trachea 91, and the subject is May cause ventilator-associated pneumonia (VAP).

In order to prevent the inflow of such secretions, a cuff 2 is provided at a predetermined position on the outer periphery of the tracheal tube 8. The cuff 2 can be expanded by supplying air from outside the body through an air supply pipe (not shown). By inflating the cuff 2, the outer peripheral surface of the cuff 2 comes into contact with the inner wall 91 a of the trachea 91 and the gap between the tracheal tube 8 and the inner wall 91 a of the trachea 91 is closed. By using such a cuffed tracheal tube, it is possible to prevent inflow of secretions and the like into the trachea 91 by the cuff 2 while securing an airway by the tracheal tube 8.

However, the secretion accumulated in the upper part (oral cavity 94 side) of the cuff 2 gradually leaks into the lower airway from the gap between the inner wall 91a of the trachea 91 and the cuff 2 over time. Therefore, in order to prevent ventilator-associated pneumonia (VAP) more completely, it is said that it is effective to continuously suck and remove secretions accumulated in the upper part of the cuff 2 and the oral cavity 94. ing.

In order to facilitate the suction of such secretions, a cuffed tracheal tube in which a hole 22c for secretion secretion is provided near the upper portion of the cuff 2 of the tracheal tube 8 is commercially available. (See FIG. 11).

In the cuffed tracheal tube shown in FIG. 11, a channel 22a formed in parallel with the main channel 8a is provided in the wall portion constituting the main channel 8a of the tracheal tube 8 (FIG. 11 (b) and (See (c)). One of the flow paths 22a communicates with a hole 22c opened to the outside of the tracheal tube 8 in the vicinity of the cuff 2 on the upper side (opposite side of the tip) of the cuff 2. Further, the other of the flow path 22a communicates with the inside of the connection tube 22b through a hole 22d opened to the outside of the tracheal tube 8 in a portion not inserted into the patient's oral cavity 94. A connector 23a is provided at the tip of the connection tube 22b.

The suction device 1 of the present embodiment is used in a state where it is connected to such a connector 23a via a connection tube 21. The other end of the connection tube 21 is connected to the suction port 124 of the suction device 1, for example.

In addition, application of the suction device 1 of this embodiment is not restricted only to such tracheal intubation, but can be applied to various uses. For example, the present invention can also be applied to a patient who needs to suck and remove secretions such as saliva, such as an ALS (muscular atrophy sclerosis) patient.

Hereinafter, the configuration of the suction device 1 of the present embodiment will be described with reference to FIG. The suction device 1 of this embodiment includes at least a blower unit 12 and a drainage container 11.

The blower unit 12 includes an exhaust passage 123 having an exhaust port 122 and an intake port 121, and a piezoelectric blower 120 provided in the middle of the exhaust passage 123. In addition, the drainage container 11 includes a storage chamber 113 having an inlet 111 and a negative pressure port 112. The intake port 121 and the negative pressure port 112 communicate with each other. Details of these will be described later.

Next, the entire configuration of an example of the suction device of the present embodiment is shown in FIGS. The suction device 1 shown in FIGS. 2 to 6 is roughly composed of three units, and includes the blower unit 12 and the drainage container 11 described above, and further includes a circuit unit 13.

(Blower unit 12)
The blower unit 12 includes an exhaust passage 123 having an exhaust port 122 and an intake port 121, and a piezoelectric blower 120 provided in the middle of the exhaust passage 123. These are housed in a housing as shown in FIGS.

The piezoelectric blower 120 is a device that generates a suction force from the IN side to the OUT side in FIG. The piezoelectric blower 120 is characterized in that air can flow in the direction opposite to the suction direction when the drive is stopped. Hereinafter, this feature will be described with reference to FIG.

Referring to FIG. 10, in piezoelectric blower 120, for example, piezoelectric element 100 made of lead zirconate titanate (PZT) ceramic is bonded to metal diaphragm 101. The diaphragm 101 is bonded with a metal plate 102b having a discharge hole 102a at the center with a spacer 102c interposed therebetween so as to form a pump chamber 102.

When the piezoelectric element 100 is caused to resonate by applying a voltage, the diaphragm 101 undergoes flexural vibration, and a volume change occurs in the pump chamber 102. As a result, a high-speed air flow is intermittently generated in the discharge hole 102a. At this time, since the pressure decreases in the vicinity of the discharge hole 102a, the air in the suction flow path 103 is sucked in the direction of the discharge hole 102a, and as a result, air is discharged from the nozzle 104. As described above, the piezoelectric blower 120 acts as an air pump that sucks air from the lower side and discharges it to the upper side, as indicated by arrows in FIG.

Here, the piezoelectric blower 120 does not have a check structure, and as shown in FIG. 10, the suction side (lower side in the figure) and the discharge side (upper side in the figure) communicate with each other. For this reason, when the supply of voltage (electric power) is stopped and the bending vibration of the piezoelectric element 100 is stopped, air can also flow in the direction opposite to the suction direction indicated by the arrow in FIG.

Therefore, according to the suction device of the present embodiment, using the characteristics of the piezoelectric blower 120, even if the tip of the suction tube is adsorbed to the tracheal mucosa or the oral mucosa during suction, the exhaust port 122 is immediately used. Air flows in more, the negative pressure state in the drainage container 11 is eliminated, and the suction state at the tip of the suction pipe can be released. If the adsorbed state continues for a long time, there is a risk of mucosal damage, so the suction device of this embodiment is a device that is safer than before.

Note that, for example, since the suction device described in Patent Document 1 is sucked at a low pressure, the suction tube may be clogged if a high-viscosity one is sucked. In that case, it is necessary to remove the suction tube, which is troublesome. Further, the suction force of the pump can be varied so that the suction force can be increased only when clogging occurs. However, since a high-capacity pump is required, the equipment is increased in size and cost. Furthermore, since these high-capacity pumps have high suction power, it is necessary to use pressure control means (pressure sensors, pressure reducing valves, etc.) in order to control them at a low pressure during normal operation. Cost is increased and maintenance is required.

Therefore, the effect of the present embodiment is that the suction state of the suction tube tip is reduced without increasing the cost of the equipment as described above, particularly when the suction device of the present embodiment is a device that performs suction at a low pressure. Useful in that it can be canceled.

Referring to FIGS. 3 to 5, it is preferable that a connector is provided at the exhaust port 122 of the blower unit 12. For example, if the suction tube is clogged due to suction of high-viscosity secretion, if there is a connector, a tube from a vacuum source that generates a higher negative pressure than the piezoelectric blower 120 can be easily connected. Therefore, it is possible to easily perform an operation of temporarily increasing the suction force to eliminate clogging of the suction pipe.

Note that it is preferable that the distance of the shortest path from the intake port 121 to the exhaust port 122 via the exhaust channel 123 of the blower unit 12 is longer than the linear distance between the intake port 121 and the exhaust port 122. Specifically, for example, the exhaust flow path 123 is preferably a flow path detoured from the nozzle 104 of the piezoelectric blower 120 to the exhaust port 122 as shown in FIG. Thereby, the vibration sound produced by the vibration of the piezoelectric blower 120 can be made difficult to leak to the outside, and the silence of the suction device can be improved.

In the suction device 1 shown in FIGS. 2 to 6, the blower unit 12 has a suction port 124 that communicates with the inlet 111 of the drainage container 11. The sucked secretion or the like (drainage) is sucked from the suction port 124 via a suction tube or the like, and sent into the storage chamber 113 of the drainage container 11 via the inlet 111.

The suction port 124 is designed to attach the blower unit 12 to the entire upper surface of the drainage container 11, and when the inlet 111 is provided on the upper surface of the drainage container 11, the connection between the suction pipe and the inlet 111 is performed. However, in other cases, the blower unit 12 does not necessarily have the suction port 124. For example, as a modification of the present embodiment, as shown in FIG. 13, the blower unit 12 (and the circuit unit 13) is not provided on the entire upper surface of the drainage container 11, and the exposed portion on the upper surface of the drainage container 11 is An inflow port 111 and a suction port 124 that directly communicates with the inflow port 111 may be provided.

(Drainage container 11)
The drainage container 11 has a storage chamber 113, and the drainage (suctioned secretion etc.) is stored in the storage chamber 113. The material, shape, and the like of the drainage container 11 are not particularly limited, but when the interior of the storage chamber 113 becomes negative pressure by driving the piezoelectric blower 120, gas can communicate between the suction port and the drainage port. The strength is required to maintain a negative pressure that can maintain the state.

The positions of the inlet 111 and the negative pressure port 112 are not particularly limited as long as they are other than the bottom of the drainage container 11, but are preferably higher than the liquid level when the drainage is accumulated in the storage chamber 113. It is more preferable to provide the inlet 111 and the negative pressure port 112 on the top plate of the drainage container 11.

The negative pressure port 112 of the drainage container 11 communicates with the intake port 121 of the blower unit 12 via the connection flow path 114 (FIGS. 2, 5, and 6). As a result, the negative pressure generated in the blower unit 12 passes through the negative pressure port 112 to make the inside of the drainage container 11 a negative pressure.

As shown in FIG. 5, the connection channel 114 is formed on the lower side (on the storage chamber 113 side) of the top plate 114 a (see FIG. 9A) of the drainage container 11. Air in the storage chamber 113 is sucked from the negative pressure port 112 and flows into the connection port 115 through the connection flow path 114.

In the suction device 1 shown in FIGS. 2 to 6, the blower unit 12 has the suction port 124 communicating with the inlet 111 of the drainage container 11 as described above. The blower unit 12 and the drainage container 11 are mounted such that the centers of the suction port 124 of the blower unit 12 and the inlet 111 of the drainage container 11 coincide.

Further, the mounting portion 125 between the blower unit 12 and the drainage container 11 has a first ring-shaped portion 125a centering on the centers of the inlet 111 and the suction port 124, and a concentric circle with the first ring-shaped portion 125a. A second annular portion 125b is provided. The first annular portion 125a and the second annular portion 125b are, for example, rubber O-rings. The first annular portion 125a has a larger diameter than the suction port 124 and the inflow port 111, and the second annular portion 125b has a larger diameter than the first annular portion 125a. Further, the negative pressure port 112 and the intake port 121 are located outside the first annular portion 125a and inside the second annular portion 125b.

Note that one of the blower unit 12 and the drainage container 11 has a bolt-shaped portion and the other has a nut-shaped portion, both of which can be screwed together and can be easily separated. Is also possible.

With the configuration of the mounting portion 125 as described above, the blower unit 12 and the drainage container 11 can be easily mounted by screwing without the need for a special locking mechanism. Further, it is not necessary to strictly align the negative pressure port 112 and the intake port 121 at the time of screwing or the like, and even if a slight deviation occurs, both can be reliably communicated.

Also, with the configuration of the mounting portion 125 as described above, it is possible to secure a path from the suction port 124 to the inflow port 111 and a plurality of connection channels 114.

The connection flow path 114 is preferably separated into a plurality of flow paths by at least one flow velocity attenuation portion.

The flow velocity attenuating portion is a portion where the flow velocity of air sucked from the negative pressure port 112 to the intake port 121 (connection port 115) becomes slower than other portions of the connection flow path 114. The flow velocity attenuating part is, for example, a part having a larger pressure loss than the other part of the connection channel 114. Specific examples of the flow velocity attenuating portion include a portion having a smaller channel cross-sectional area than other portions of the connection channel 114, a portion where the channel is bent, and the like.

Specifically, referring to FIG. 7, connection channel 114 is partitioned by a ring-shaped partition wall 126 concentric with mounting portion 125 (first ring-shaped portion 125 a and second ring-shaped portion 125 b). 126 has an opening 126 a at a position farthest from the negative pressure port 112. The opening 126a is a part having a smaller channel cross-sectional area than the other part of the connection channel 114, and is also a part where the channel is bent, and thus corresponds to the flow velocity attenuation part. Further, as indicated by an arrow in FIG. 7, the flow velocity is also slowed when the connection flow path 114 is separated into two from the negative pressure port 112 and the flow collides with the opening 126a.

By providing such a flow rate attenuating portion, it is possible to prevent the drainage liquid (suctioned secretions, etc.) in the storage chamber 113 from flowing into the blower unit 12, and the piezoelectricity due to the intrusion of the drainage liquid into the blower unit 12. A failure of the blower 120 can be suppressed.

It is preferable that the distance of the shortest path from the negative pressure port 112 to the intake port 121 via the connection flow path 114 is longer than the linear distance between the negative pressure port 112 and the intake port 121. For example, the route indicated by the arrow in FIG. 7 is the shortest route from the negative pressure port 112 to the intake port 121 via the connection flow path 114, and the shortest route is a straight line between the negative pressure port 112 and the intake port 121. The connection flow path 114 is designed to be longer than the distance. Thereby, the failure of the piezoelectric blower 120 due to the intrusion of the drained liquid into the blower unit 12 can be more reliably suppressed.

9A, a hydrophobic filter 112a is provided at the connection port 115 (between the negative pressure port 112 and the intake port 121) (in FIGS. 4 to 6, the hydrophobic filter 112a is provided). The characteristic filter 112a is omitted). By providing the hydrophobic filter 112a, the intrusion of the drainage into the blower unit 12 can be suppressed.

In addition, it is preferable that the blower unit 12 and the drainage container 11 have a removable structure. Thereby, when drainage liquid accumulates, only the drainage container 11 can be removed and discarded. The blower unit 12 can also be removed and discarded for each patient.

Even if the connection port 115 is provided with the hydrophobic filter 112a, it is not possible to completely prevent the entry of bacteria and the like from the drainage container 11, so the blower unit 12 is replaced for each patient, It is desirable to prevent infection. It is possible to prevent bacteria from entering by using a bacterial filter or the like instead of the hydrophobic filter 112a. However, since the pressure loss increases, the suction force decreases, and the piezoelectric force is maintained in order to maintain the suction force. It is necessary to increase the size of the blower 120 or the like.

(Circuit unit 13)
The circuit unit 13 includes an operation switch 132, a display unit 133, a control unit 131, and a power source. These are housed in a housing as shown in FIGS.

Although not shown, the power source is electrically connected to each part of the circuit unit 13 and the piezoelectric blower 120 so that power (voltage) can be supplied. As a result, driving is possible without requiring an external power source.

The control unit 131 can control the driving of the piezoelectric blower 120 and includes, for example, a memory control unit (MCU).

It is preferable that the controller 131 can drive the piezoelectric blower 120 intermittently. By driving the piezoelectric blower 120 intermittently, the power consumption of the suction device can be saved and it can be used for a long time.

For example, when the slide switch 132a provided in the circuit unit 13 is turned ON, the piezoelectric blower 120 is intermittently driven by the control unit 131, and the suction operation is intermittently performed. What is necessary is just to set suitably the time of 1 time of suction, and the space | interval of suction | inhalation according to the patient etc. of suction | inhalation. Specifically, for example, suction for 20 seconds is performed only once for 5 minutes.

It is desirable that one suction time (driving time of the piezoelectric blower 120) is a time sufficient to finish sucking most of the secretions in the upper part of the cuff, but more than necessary to reduce power consumption. It is preferable not to lengthen the suction time. It is desirable that the suction interval is such that secretions in the upper part of the cuff do not accumulate too much and the risk of VAP increases, but in order to reduce power consumption, the suction interval should not be shortened more than necessary. preferable.

Note that this drive interval may be switched by the slide switch 132a. Of course, the driving interval and the one-time driving time can be arbitrarily set in circuit design (or microcomputer software or the like).

In addition to the slide switch 132a, the circuit unit 13 is provided with a push switch 132b so that suction can be performed continuously while the switch is being pressed.

Also, during the suction operation, the green LED is lit, so that it can be visually confirmed that the suction operation is being performed. The red (or yellow) LED is configured to light up when the remaining battery level is low.

In addition, the circuit unit 13 can be normally removed and reused. However, since the circuit unit 13 is also a simple circuit, it may be low-cost and replaced for each patient.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 suction device, 100 piezoelectric element, 101 diaphragm, 102 pump chamber, 102a discharge hole, 102b metal plate, 103 suction flow path, 104 nozzle, 11 drainage container, 111 inlet, 112 negative pressure port, 112a hydrophobic filter, 113 storage chamber, 114 connection channel, 114a top plate, 115 connection port, 12 blower unit, 120 piezoelectric blower, 121 intake port, 122 exhaust port, 123 exhaust channel, 124 suction port, 125 mounting part, 125a first Ring-shaped part, 125b Second ring-shaped part, 13 circuit unit, 131 control unit, 132 operation switch, 132a slide switch, 132b push switch, 133 display unit, 2 cuff, 21 connection tube, 22a flow path, 22b connection tube, 22c 22d holes, 23a luer connector, 8 tracheal tube, 8a main channel, 91 trachea, 91a inner wall 92 esophagus, 93 epiglottis 94 oral.

Claims

An exhaust channel having an exhaust port and an intake port, and a blower unit including a piezoelectric blower provided in the middle of the exhaust channel;
A drainage vessel including a reservoir having an inlet and a negative pressure port;
A suction device in which the intake port and the negative pressure port communicate with each other.
The intake port and the negative pressure port communicate with each other via a connection flow path,
The suction device according to claim 1, wherein the connection flow path is separated into a plurality of flow paths by at least one flow velocity attenuation unit.
The suction device according to claim 2, wherein a distance of a shortest path from the negative pressure port to the intake port via the connection flow path is longer than a linear distance between the negative pressure port and the intake port.
The suction device according to any one of claims 1 to 3, wherein the negative pressure port has a hydrophobic filter.
The distance of the shortest path from the intake port to the exhaust port via the exhaust channel of the blower unit is longer than a linear distance between the intake port and the exhaust port. The suction device according to claim 1.
The suction device according to any one of claims 1 to 5, wherein the exhaust port has a connector.
The blower unit has a suction port that communicates with the inflow port of the drainage container;
The blower unit and the drainage container are mounted so that the centers of the suction port of the blower unit and the inflow port of the drainage container coincide with each other.
A mounting portion between the blower unit and the drainage container includes a first annular portion centered on the center of the inlet and the suction port, and a second concentric circle with the first annular portion. And a ring-shaped part of
The first ring-shaped portion has a larger diameter than the suction port and the inflow port, the second ring-shaped portion has a larger diameter than the first ring-shaped portion,
The suction device according to any one of claims 1 to 6, wherein the negative pressure port and the intake port are located outside the first annular portion and inside the second annular portion.
The suction device according to any one of claims 1 to 7, wherein the blower unit and the drainage container are removable.
In addition, a circuit unit is provided.
The suction device according to any one of claims 1 to 8, wherein the circuit unit includes a power source and a control unit that controls driving of the piezoelectric blower.
The suction device according to claim 9, wherein the control unit can drive the piezoelectric blower intermittently.
The suction device according to claim 9 or 10, wherein the circuit unit is removable.