JP2023014702A - Suction system, and control method for suction system - Google Patents

Abstract

To suck liquid from a patient by using fewer suction sources when a suction system uses a plurality of suction paths.SOLUTION: A suction system 100 which has suction pressure with which liquid is sucked from a patient operate on a plurality of suction paths, includes: a closing part 20 closing each of the plurality of suction paths; and a control part 19 which controls the closing part so that it opens one of the plurality of suction paths, closes the rest of the plurality of suction paths, then opens another suction path different from one of the rest of the suction paths, and closes the other suction paths including the one suction path of the plurality of suction paths.SELECTED DRAWING: Figure 1

Description

The present invention relates to a suction system that sequentially opens a plurality of suction paths according to a predetermined order, and a control method for the suction system.

As a suction device for sucking saliva, Patent Document 1 discloses a suction device that applies suction pressure to a suction flow path. This aspirator includes pump means for generating a suction pressure and pressure adjustment means for adjusting the suction pressure. Furthermore, the suction device comprises control means for controlling the operation of the pressure regulating means.

JP 2017-144060 A

SUMMARY OF THE INVENTION The present invention seeks to provide an aspiration system that utilizes multiple aspiration paths and which uses fewer sources of aspiration to aspirate liquid from a patient.

A suction system according to an aspect of the present invention is a suction system that applies a suction pressure for sucking liquid from a patient to a plurality of suction channels, comprising: a closing portion that closes each of the plurality of suction channels; One suction route out of the suction routes is opened, the remaining suction routes out of the plurality of suction routes are closed, and then another suction route different from the one suction route out of the remaining suction routes is opened. and a control unit that controls the closing part so as to open and close other suction paths including the one suction path among the plurality of suction paths.

Further, a suction system control method according to an aspect of the present invention controls a suction system including a closing portion that applies a suction pressure for suctioning liquid from a patient to a plurality of suction paths and closes each of the plurality of suction paths. A method comprising: opening one aspiration path of the plurality of aspiration paths, closing a remaining aspiration path of the plurality of aspiration paths, and then closing the one aspiration path of the remaining aspiration paths. The closing part is controlled so as to open another suction path different from the above and close other suction paths including the one suction path among the plurality of suction paths.

This allows fluid to be aspirated from the patient using fewer suction sources when the aspiration system utilizes multiple aspiration paths.

Schematic diagram of the aspiration system with the first drain tube open. Schematic diagram of the aspiration system with the second drain tube open. Schematic explanatory drawing of operation|movement of a cam mechanism. 4 is a schematic flowchart of suction processing; Schematic of the suction system which concerns on 2nd Embodiment. Schematic explanatory drawing of operation|movement of a solenoid mechanism. FIG. 11 is a schematic diagram of a first suction path in a suction system according to a third embodiment; Schematic diagram of a second suction path in a suction system according to a third embodiment. FIG. 11 is a schematic diagram of a third suction path in a suction system according to a third embodiment; Schematic explanatory drawing of operation|movement of a 1st cam. 4A and 4B are schematic cross-sectional views of the first to third cams, where A indicates a state with a rotation angle of 0°, B indicates a state with a rotation angle of 60°, and C indicates a state with a rotation angle of 180°;

Exemplary embodiments for carrying out the present invention will now be described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative positions of components described in the following embodiments can be arbitrarily set, and can be changed according to the configuration of the apparatus to which the present invention is applied or various conditions. Also, unless otherwise stated, the scope of the invention is not limited to the embodiments specifically described below.

The saliva drainage tube can be used for patients who cannot swallow saliva on their own, such as amyotrophic lateral sclerosis (ALS), muscular dystrophy, Parkinson's disease, Alzheimer's disease, impaired consciousness, or handicapped children. For example, in order to prevent aspiration pneumonia and the like, a continuous low negative pressure suction system, which is an example of the suction system 100, can utilize a saliva drainage tube left in the patient's oral cavity. For example, a wire is inserted into the inner diameter side of the saliva drainage tube, and by bending the wire, the shape of the wire can be matched to the shape of the patient's mouth. However, it may be difficult to sufficiently match the shape of the wire to the shape of the patient's mouth by simply bending the wire.

It is desirable that the tip of the saliva drainage tube for sucking saliva be arranged at a location where saliva tends to accumulate in the oral cavity of the patient. However, movement or body movement of the patient's tongue may make it difficult to keep the tip in place in the patient's oral cavity. Furthermore, the location where saliva tends to accumulate varies from patient to patient and also varies depending on the patient's body position. In addition, each patient may have a plurality of locations where saliva tends to accumulate. Therefore, if a plurality of saliva drainage tubes are used, saliva can be efficiently sucked. For example, saliva can be efficiently sucked even when the tip moves in the oral cavity, or when there are multiple locations where saliva tends to accumulate.

[First embodiment]
1 to 4, a suction system 100 that applies suction pressure for suctioning liquid from a patient to a plurality of suction paths will be described. FIG. 1 is a schematic diagram showing the aspiration system 100 with the first drainage tube 11 open. In the state shown in FIG. 1 , the second drainage tube 12 is closed and saliva is sucked through the first drainage tube 11 . FIG. 2 is a schematic diagram showing the suction system 100 with the second drainage tube 12 opened. In the state shown in FIG. 2 , the first drainage tube 11 is closed and saliva is sucked through the second drainage tube 12 . FIG. 3 is an explanatory diagram for explaining changes in the rotation angle of the cam 21 with respect to elapsed time. The vertical axis represents the rotation angle from the start of rotation of the cam 21, and the horizontal axis represents shows the elapsed time. FIG. 4 is a flowchart for explaining the suction process.

As shown in FIG. 1, the suction system 100 includes, as an example of a plurality of suction channels, a first suction channel including a first drainage tube 11 and a suction tube 16, and a second drainage tube 12 and a suction tube 16. and a second suction path. For example, the suction path is a path on which suction pressure by the suction section acts, and has a flow path through which liquid or gas such as air flows. The suction system 100 further includes a pump 15 as an example of a suction unit that generates suction pressure acting on the first suction path and the second suction path. A pump 15 is connected to each of the plurality of suction paths. In the following description, the first suction path and the second suction path may be collectively referred to simply as a suction path.

The first drainage tube 11 and the second drainage tube 12 have internal flow paths through which saliva, which is an example of liquid to be sucked, flows. In addition, the suction tube 16 has a flow path through which air flows so that suction pressure corresponding to the negative pressure (or negative pressure) generated by the pump 15 acts on the suction path. A suction pressure acts on the suction path. A suction system 100 is connected to the first drainage tube 11 and the second drainage tube 12 . The distal ends of the first drainage tube 11 and the second drainage tube 12 are left in the oral cavity of the patient. Each tip is desirably placed at a different location in the oral cavity. However, both ends may be placed adjacent to each other so as to suck saliva from the same place in the oral cavity. Note that the first drainage tube 11 and the second drainage tube 12 are configured to be removable from the suction system 100 . However, the suction system 100 may include the first drainage tube 11 and the second drainage tube 12 . In this case, the first drainage tube 11 and the second drainage tube 12 may be configured integrally with part of the suction system 100 .

The suction system 100 sucks saliva, which is an example of liquid, from the oral cavity, which is an example of the patient's body. The saliva sucked by the suction system 100 then flows through the internal channels of the first drainage tube 11 and the second drainage tube 12 . The number of suction paths is not limited to two, and may be three or more. In this case, the number of pumps 15 is less than the number of suction paths. That is, at least one pump 15 may be connected to two or more suction paths. Also, when there are three or more suction paths, another suction path including a drainage tube that is not closed by the cam mechanism 20 may be connected to the pump 15 .

The suction system 100 also includes a cam mechanism 20 as an example of a closing portion that closes each of the plurality of suction paths. The cam mechanism 20 has a cam 21 which is an example of a rotating body. Then, the cam 21 presses and closes a part of each of the first drainage tube 11 and the second drainage tube 12 as an example of a part of each of the plurality of suction paths. The cam mechanism 20 also has a motor 22 that rotates the cam 21 . The motor 22 is, for example, a DC motor, an AC motor, an ultrasonic motor, or the like. A rotation transmission mechanism including a shaft and gears (not shown) may be provided between the motor 22 and the cam 21 . In this case, the torque from the motor 22 is transmitted to the cam 21 via the rotation transmission mechanism.

In the example of FIG. 1, the solid line indicates the cam 21 with a rotation angle of 0° at the start of rotation, and the dashed line indicates the cam 21 with a rotation angle of 90° after the start of rotation. Here, the rotation angle is an angle formed by a line segment connecting the position VP' and the rotation center CP of the cam 21 and a line segment connecting the position VP and the rotation center CP. The position VP' is the position at the start of rotation of the apex on the circumference of the base circle of the cam 21, which is an example of the reference point. The position VP is the position of the vertex on the circumference of the base circle of the cam 21 during rotation. Note that the reference point may be on the circumference of the base circle and may not be the vertex of the cam 21 . Moreover, although the cam 21 shown in FIG. 1 has a substantially semicircular shape, it may have another shape such as a teardrop shape.

When the cam 21 is rotated by the motor 22 , each of the first drainage tube 11 and the second drainage tube 12 in contact with the cam 21 is pinched and pressed between the cam 21 and the pressing portion 23 . As a result, the internal flow path is crushed and each of the first drainage tube 11 and the second drainage tube 12 is closed. Therefore, in the crushed drainage tube, the flow of saliva is impeded and the suction stops. In the example of FIG. 1, the second drainage tube 12 is pressed by the cam 21 indicated by the solid line, and the suction of saliva through the second drainage tube 12 is stopped. On the other hand, in the first drainage tube 11 that is not compressed by the cam 21, the internal flow path is not crushed. Therefore, the flow of saliva is not hindered, and saliva is sucked through the first drainage tube 11 in the direction indicated by the arrow DA.

When the outer peripheral surface of the rotating cam 21 moves away from the pressing portion 23, each of the first drainage tube 11 and the second drainage tube 12 returns to its original shape due to its own elastic force. As a result, the internal flow path also returns to its original shape, and the obstruction to the flow of saliva is released, so saliva is sucked. In the example of FIG. 1, the outer peripheral surface of the cam 21 moves away from the pressing portion 23 according to the rotation angle. return to the shape of Therefore, the inhibition of the flow of saliva is released, and the saliva is sucked through the second drainage tube 12 . If the amount of saliva that flows is extremely small and the flow is substantially impeded, the internal flow path need not be completely crushed.

Furthermore, the suction system 100 has a pump 15 as an example of a suction unit that generates suction pressure acting on a plurality of suction paths. Here, the suction pressure suitable for sucking saliva varies depending on the viscosity of the saliva to be sucked. However, even if the viscosity of saliva is high, it is considered that the viscosity does not exceed that of sputum. Therefore, the suction pressure acting on the first drainage tube 11 and the second drainage tube 12 is set, for example, within a range from maximum negative pressure -20 kP to minimum negative pressure -2 kP. In addition, the suction path is provided with a saliva tank 17 for storing saliva as an example of a liquid tank. In the example of FIG. 1 , a saliva reservoir 17 is arranged between the first and second drainage tubes 11 and 12 and the suction tube 16 . A first drainage tube 11 and a second drainage tube 12 are connected to the saliva tank 17 . That is, the pump 15 is connected to the first drainage tube 11 and the second drainage tube 12 via the suction tube 16 and the saliva reservoir 17 . Saliva sucked through the first drainage tube 11 and the second drainage tube 12 is accumulated in the saliva reservoir 17 .

[Suction order]
By using a plurality of suction paths, the distal end of each drainage tube can be arranged at each of a plurality of locations in the oral cavity where saliva tends to accumulate. Here, when a plurality of drainage tubes are simultaneously sucked with a continuous low suction pressure (or low negative pressure) by a single pump 15, saliva is more difficult to aspirate than other drainage tubes. A tube is formed. That is, the suction resistance of the drainage tube located at the location where saliva tends to accumulate is greater than the suction resistance of the drainage tube located at the location where saliva is less likely to accumulate. Therefore, it is relatively difficult for the drainage tube, which is placed at a location where saliva tends to accumulate and where a large amount of saliva has accumulated, to suck saliva.

However, if different pumps 15 are connected to the plurality of suction paths in order to adjust the suction pressure, it is necessary to provide the plurality of pumps 15 . Therefore, the size of the suction system 100 becomes large and the price becomes high. Therefore, in the suction system 100 of the present embodiment, a smaller number of pumps 15 are used to alternately close and open a plurality of suction paths. As a result, it is possible to suppress the occurrence of a drainage tube that makes it difficult to suck saliva. At the same time, an increase in the size and cost of the suction system 100 can be suppressed.

Specifically, any one of a plurality of suction paths connected to one pump 15 is opened to communicate with the pump 15 . Then, all the other suction channels are closed to block communication with the pump 15 . After that, when a predetermined time elapses, any one of the closed suction paths is opened to communicate with the pump 15 . Then, all the other suction channels are closed to block communication with the pump 15 . After that, when a predetermined time elapses, any one of the closed suction paths, excluding the previously opened suction path, is opened and communicated with the pump 15.例文帳に追加Then, all the other suction channels are closed to block communication with the pump 15 . Similarly, the suction paths to be opened are sequentially alternated, and saliva is sucked from any one suction path.

1 and 2, the suction system 100 includes a control section 19 that controls the cam mechanism 20. As shown in FIG. As an example, the control unit 19 is a computer having a processor (not shown) and a memory as a computer-readable non-temporary storage medium storing a control program. The processor is, for example, a CPU (Central Processing Unit) or MPU (Micro-Processing Unit), and controls the entire suction system 100 including the cam mechanism 20 and the pump 15 based on a program stored in memory, It also comprehensively controls various processes. The memory includes RAM (Random Access Memory), which is system work memory for the processor to operate, ROM (Read Only Memory), HDD (Hard Disc Drive), and SSD (Solid State Drive) for storing programs and system software. ) and other storage devices.

Furthermore, the control unit 19 can be used as a portable recording medium such as a CD (Compact Disc), a DVD (Digital Versatile Disc), a CF (Compact Flash) card, and a USB (Universal Serial Bus) memory, or an external device such as a server on the Internet. Control can also be performed according to a program stored in a storage medium. Further, the control unit 19 may control the operation of the pump 15 based on the flow rate and the suction pressure respectively output by a flow rate sensor and a pressure sensor (not shown). As an example, a flow sensor and a pressure sensor are provided in the saliva reservoir 17 . It is desirable that the flow rate of saliva to be sucked is set or controlled so as to be a necessary and sufficient flow rate. For example, when aspirating saliva from a patient who cannot swallow saliva, the patient often does not close his or her mouth. If the patient's mouth is not closed and the flow rate of the saliva to be sucked is large, the patient's mouth becomes dry. Therefore, the flow rate of saliva to be sucked is set to a maximum flow rate of 10 L/min or less. Note that the control unit 19 may be realized by a hardware circuit, or may be realized as a logical device combining computer hardware and software.

The control unit 19 controls the cam mechanism 20 to open one of the first suction path including the first drainage tube 11 and the second suction path including the second drainage tube 12, and Another one of the first suction path and the second suction path, which is the remaining suction path, is closed. For example, the control section 19 controls the rotation speed of the cam 21 of the cam mechanism 20 . After that, the control unit 19 controls the cam mechanism 20 to open another suction path, which is different from the previously opened suction path, among the remaining suction paths, and to open the first suction path and the second suction path. Of the two suction paths, the other suction paths including the previously opened one are closed.

For example, as shown in FIG. 1, the cam mechanism 20 first opens the first drainage tube 11 of the first suction path and the remaining The second drainage tube 12 of the second suction path is closed. It should be noted that the start of opening and the start of closing need not be simultaneous, and there may be a time lag between the two. After that, the cam 21 rotates, and as shown in FIG. 2, a line segment connecting the vertex position VP' at the start of rotation and the rotation center CP, and the vertex position VP of the cam 21 during rotation and the rotation center CP The angle formed by the line segment connecting and is 180°.

Since the remaining suction path is one of the second suction paths here, the cam mechanism 20 opens the second suction path as a separate suction path different from the previously opened first suction path. That is, the cam mechanism 20 opens the second drainage tube 12 of the second suction path. In addition, since the other first suction path is one of the first suction paths, the cam mechanism 20 closes the first suction path as another suction path including the previously opened first suction path. . It should be noted that the end of opening and the end of closing need not be simultaneous, and there may be a time lag between the two.

In FIG. 2, the first drainage tube 11 is pressed by the cam 21 and the suction of saliva through the first drainage tube 11 is stopped. On the other hand, the internal channel of the second drainage tube 12 that is not pressed by the cam 21 is not crushed. Therefore, the flow of saliva is not hindered, and saliva is sucked through the second drainage tube 12 in the direction indicated by the arrow DB.

The operation of the cam mechanism 20 that rotates once every 60 seconds will be described in detail with reference to FIG. First, when the elapsed time at the start of rotation is 0 seconds, the rotation angle is 0°. At this time, the first drainage tube 11 is open and the second drainage tube 12 is closed. Then, when 15 seconds have passed and the rotation angle reaches 90°, both the first drainage tube 11 and the second drainage tube 12 are opened. After that, the first drainage tube 11 is closed and only the second drainage tube 12 is opened.

When 30 seconds have passed and the rotation angle is 180°, the second drainage tube 12 is open and the first drainage tube 11 is closed. When 45 seconds have passed and the rotation angle is 90°, both the first drainage tube 11 and the second drainage tube 12 are open. After that, the second drainage tube 12 is closed and only the first drainage tube 11 is opened. When 60 seconds have passed and the rotation angle is 0°, the first drainage tube 11 is open and the second drainage tube 12 is closed. Thereafter, similar opening and closing are repeated until the end of suction.

In the example of FIG. 3, there is a state where both the first drainage tube 11 and the second drainage tube 12 are open. Therefore, the time during which the first drainage tube 11 and the second drainage tube 12 are opened during one rotation of the cam 21 is slightly longer than 30 seconds. Moreover, the time during which the first drainage tube 11 and the second drainage tube 12 are closed during one rotation of the cam 21 is shorter than 30 seconds. However, the state in which both the first drainage tube 11 and the second drainage tube 12 are open continues for a short time. Therefore, it has little effect on suction. Alternatively, the shape of the cam 21 may be changed such that there is a state in which both the first drainage tube 11 and the second drainage tube 12 are closed.

As an example, the controller 19 opens another suction path after a predetermined period of time has elapsed since one suction path was opened. For example, the predetermined time is the time required for the cam 21 to rotate from 0° to 90°. Another example of the predetermined time is half the time it takes the cam 21 to make one revolution. Note that the predetermined time may be changed according to the shape of the cam 21 or the like. In addition, the time from the opening of the suction path to the opening of the next suction path may be different between the plurality of suction paths. For example, the time from opening the first suction path to opening the second suction path may be longer or shorter than the time from opening the second suction path to opening the first suction path. may

Further, the control unit 19 controls the cam mechanism 20 so that the plurality of suction paths are opened in order. As an example, if there is a previously opened suction route among the remaining suction routes of the plurality of suction routes, the control unit 19 selects another one of the remaining suction routes excluding the previously opened route. The cam mechanism 20 is controlled to open the suction path. Further, the control unit 19 controls the cam mechanism 20 so as to reopen the first suction path after all the plurality of suction paths are opened.

Taking FIG. 1 as an example, out of the first drainage tube 11 and the second drainage tube 12, when the first drainage tube 11 of the first suction path is opened, the remaining suction path is the second drainage tube 12. becomes a second suction path including Here, the second drainage tube 12 has not been opened previously. Therefore, the second suction path is not excluded from the targets to be opened, and the second suction path is opened as another suction path that is opened next to the first suction path. Furthermore, after all of the first drainage tube 11 and the second drainage tube 12 are opened, the initially opened first drainage tube 11 is opened again.

Also, in an example where there are three suction paths, when the first suction path among the three suction paths is opened, there are two remaining suction paths. Here, since the two suction paths have not been opened first, either of the two suction paths is opened as another suction path to be opened next without being excluded from the targets to be opened. Subsequently, when the second suction route out of the three suction routes is opened, the remaining suction routes are the first suction route and the third suction route. Here, the first suction path is the previously opened path. Therefore, as a result of removing the first suction path from the targets to be opened, the third suction path is opened as another suction path to be opened after the second suction path. Furthermore, after all three suction paths have been opened, the first suction path that was initially opened is opened again.

In addition, the order of the suction paths to be opened may be set arbitrarily. For example, the order may be left-to-right or right-to-left of the lined suction paths. Furthermore, the order is in descending or decreasing order of the size of the drain tube, in descending or decreasing order of the liquid tanks communicating with the drain tube, or in the order of decreasing liquid volume in the liquid tank communicating with the drain tube. may be in descending order or decreasing order. In addition, the order may be random, or in the case where consecutive numbers are associated with the respective suction paths, the numerical order may be used.

[Suction process]
The suction process in the suction system 100 will be described with reference to the flowchart of FIG. As an example, the suction process is started by a user operation to start suction and ends by a user operation to end suction. For example, the user operation is pressing of a button provided on the operation unit of the suction system 100 or touch operation of a button provided on a touch panel, which is a display operation unit of the suction system 100 .

When the user performs a user operation to start suction, the cam mechanism 20 opens the first drainage tube 11 of the first suction path, which is one of the plurality of drainage tubes, and the remaining suction path. The second drainage tube 12 of the second suction path is closed (S101). Note that if one suction path is already open at the start of suction, the cam mechanism 20 is not rotated for opening. Similarly, if the remaining suction paths are already closed at the start of suction, the cam mechanism 20 is not rotated for closing. After that, if the predetermined time has not elapsed (NO in S102), the opening of the first drainage tube 11 and the closing of the second drainage tube 12 continue.

On the other hand, when a predetermined time has elapsed (YES in S102), the cam mechanism 20 opens the second drainage tube 12 of the second suction path, which is another suction path among the plurality of suction paths, and the remaining cam mechanisms The first drainage tube 11, which is 20, is closed (S103). After that, if the predetermined time has not elapsed (NO in S104), the closing of the first drainage tube 11 and the opening of the second drainage tube 12 continue. On the other hand, when a predetermined time has passed (YES in S104) and the user performs a user operation to end suction (YES in S105), the suction process ends. If the suction is not finished (NO in S105), the cam mechanism 20 reopens the first drainage tube 11, which is another suction path among the plurality of suction paths, and the second drainage tube 11, which is the remaining suction path. The tube 12 is closed again (S103). From then on, one suction path is opened sequentially and the remaining suction paths are closed until the suction is completed.

According to the suction system 100 of the first embodiment described above, liquid can be sucked using a smaller number of suction sources when a plurality of suction paths are used. Also, liquid can be efficiently sucked even if a plurality of suction paths are connected to one suction source. In other words, the distal ends of the plurality of drainage tubes can be arranged at respective positions where saliva tends to accumulate. Furthermore, since saliva can be intermittently and reliably sucked from each drainage tube, it is possible to reduce the frequency of periodic confirmation of the state of accumulation of saliva. For example, at night while the patient is asleep, the patient's caregiver or patient's family member moves the distal end of the drainage tube as needed to aspirate the patient's saliva. For this reason, it is necessary to periodically check the status of the patient's saliva accumulation. On the other hand, according to the suction system 100, since it becomes difficult for saliva to accumulate in the oral cavity, the confirmation frequency can be reduced.

[Second embodiment]
A second embodiment will be described with reference to FIGS. 5 and 6. FIG. The second embodiment differs from the first embodiment in that drainage fluid containing body fluids such as blood is aspirated from closed spaces such as chest and abdominal cavities. 5 is a schematic diagram showing the suction system 200, and FIG. 6 is an explanatory diagram of the operation of the solenoid mechanism 220. As shown in FIG. In addition, in the description of the second embodiment, differences from the first embodiment will be described, and the same reference numerals will be given to the components that have already been described, and the description thereof will be omitted. Components with the same reference numerals have substantially the same operations and functions, and have substantially the same effects, unless otherwise specified.

The suction system 200 includes a first suction route, a second suction route, and a third suction route as an example of a plurality of suction routes. The first suction path includes a first drainage tube 211 and a first suction tube 216A. The second suction path includes a second drainage tube 212 and a second suction tube 216B. The third suction path includes the third drainage tube 213 and the third suction tube 216C. Furthermore, the suction system 200 includes a suction device 215 as an example of a suction unit that generates a suction pressure acting from the first suction path to the third suction path. The suction device 215 is connected to each of the plurality of suction paths. In the following description, the first to third suction paths may be collectively referred to simply as suction paths. Also, the first suction tube 216A, the second suction tube 216B, and the third suction tube 216C may be collectively referred to simply as the suction tube 216 in some cases.

Each of the first drainage tube 211, the second drainage tube 212, and the third drainage tube 213 is connected to a drain tube placed inside the patient's chest cavity, abdominal cavity, or the like. In addition, each drain tube is included in the suction route, and the tip of each drain tube is desirably left in a different location inside the chest cavity, the abdominal cavity, or the like. However, at least two of the distal end portions of the plurality of drain tubes may be placed adjacent to each other so as to aspirate body fluid such as blood from the same internal portion such as the thoracic cavity and the abdominal cavity. The first drainage tube 211 , the second drainage tube 212 and the third drainage tube 213 are configured to be removable from the suction system 200 . However, the suction system 200 may comprise a first drainage tube 211 , a second drainage tube 212 and a third drainage tube 213 . In this case, the first drainage tube 211 , the second drainage tube 212 , and the third drainage tube 213 may be configured integrally with part of the suction system 200 .

The aspiration system 200 aspirates body fluid, which is an example of liquid (hereinafter also referred to as "drainage"), from the inside of the patient's body, such as the thoracic cavity and the abdominal cavity. In addition, the first drainage tube 211, the second drainage tube 212, and the third drainage tube 213 have internal channels through which the drainage flows. Further, the suction tube 216 has a flow path through which air flows so as to apply suction pressure corresponding to the negative pressure generated by the suction device 215 to the suction path. For example, when aspirating unnecessary drainage from the intraperitoneal cavity or intrathoracic cavity after surgery, a suction pressure within a range not exceeding the maximum negative pressure of −5 kP is applied. However, for therapeutic purposes, the aspiration pressure may exceed negative pressure -5 kP. As an example, when performing negative pressure wound therapy on chronic wounds, the suction pressure may be in the range of -16.7 kP to -20.0 kP. Also, when aspirating drainage from the abdominal cavity or the thoracic cavity, it may be necessary to appropriately control the amount of suction at each suction point. In this case, different suction pressures may be applied to the respective suction paths. As an example, if necessary, the suction pressure in the suction device 215 is adjusted so that the suction pressure when the first suction path is opened differs from the suction pressure when the second or third suction path is opened. may be set. The drainage sucked by the suction system 200 flows through the first drainage tube 211, the second drainage tube 212, and the third drainage tube 213, respectively. The number of multiple suction paths is not limited to three, and may be four or more. In this case, the number of suction devices 215 is less than the number of suction paths. That is, at least one suction device 215 may be connected to two or more suction paths. As such, the suction system 200 may comprise more than one suction device 215 .

The suction system 200 also includes a first solenoid mechanism 220A, a second solenoid mechanism 220B, and a third solenoid mechanism 220C as an example of a closing portion that closes each of the plurality of suction paths. Hereinafter, the first solenoid mechanism 220A, the second solenoid mechanism 220B, and the third solenoid mechanism 220C may be collectively referred to simply as the solenoid mechanism 220 in some cases. Each solenoid mechanism 220 has a well-known structure, and as an example, has a mechanism in which a movable pin moves within a coil. Also, each of the solenoid mechanisms 220 squeezes a respective portion of the suction tube 216 closed. A suction tube that is not closed by the solenoid mechanism 220 may be connected to the suction system 200 .

With no voltage applied to the solenoid mechanism 220, the suction tube 216 is compressed by the pin. This causes the internal flow path to collapse and close each of the suction tubes 216 . Therefore, in the crushed suction tube 216, the flow of air is obstructed and suction stops. Alternatively, solenoid mechanism 220 may advance and retract a blocking member that blocks the internal flow path of suction tube 216 . In this case, the solenoid mechanism 220 moves the closing member between a closed position protruding into the internal channel of the suction tube 216 and an open position retracted from the internal channel. The blocking member in the closed position closes the internal flow path of suction tube 216 to impede the flow of air through suction tube 216 .

Furthermore, the suction system 200 has a suction device 215 as an example of a suction unit that generates suction pressure acting on a plurality of suction paths. As an example, suction device 215 may be a negative pressure pump, wall suction, or a drainage bag. For example, wall suction is a negative pressure source provided on the wall of an operating room or hospital room. Moreover, the drainage bag is a bag in which a spring is arranged, and is inflated by the force of the spring to generate a negative pressure.

The suction path is provided with a drainage tank 217 as an example of a liquid tank for storing the drainage. In the example of FIG. 5 , the drainage tank 217 is arranged between the first drainage tube 211 , the second drainage tube 212 , the third drainage tube 213 and the suction tube 216 . A first drainage tube 211 , a second drainage tube 212 , or a third drainage tube 213 is connected to each drainage tank 217 . That is, the suction device 215 is connected to the first drainage tube 211 , the second drainage tube 212 and the third drainage tube 213 via the suction tube 216 and the drainage tank 217 . Then, the liquid discharged through the first liquid discharge tube 211 , the second liquid discharge tube 212 , and the third liquid discharge tube 213 is accumulated in the liquid discharge tank 217 .

The drain tank 217 stores at least the amount of liquid sucked through each of the suction paths and the total amount of liquid sucked through all the suction paths as the amount of liquid sucked. It has a suction amount portion 214 indicating one side. For example, aspiration volume section 214 indicates the approximate volume or weight of aspirated drainage, which allows the user to draw a It is possible to know the suction amount of the suctioned liquid. Note that the suction amount section 214 may indicate the suction amount for each predetermined time period, for example, one hour, twelve hours, or one day. As an example, the suction amount unit 214 is a display device included in the suction system 200, such as a touch panel display, a liquid crystal display, or an organic EL display. Also, the suction amount unit 214 may be connected to the control unit 219 . In this case, the control unit 219 receives data indicating the amount of liquid from a liquid amount detection unit (not shown) provided in the drainage tank 217 and causes the suction amount unit 214 to display the data. As an example, the liquid amount detection unit is a scale that measures the weight of the liquid in the drainage tank 217 . Also, the liquid volume detection unit may be a sensor that detects the volume of the liquid in the drainage tank 217 . For example, the sensor detects the volume corresponding to the position of the liquid level by detecting the position of the liquid level of the accumulated waste liquid.

Alternatively, the suction volume portion 214 may be a scale indicating the liquid volume. For example, at least part of the drainage tank 217 is permeable, and the user visually recognizes the position of the liquid surface from the outside of the drainage tank 217 . The user can then compare the scale provided in the drainage tank 217 with the position of the liquid surface to recognize the total suction amount of the drainage. In other words, the scale as the suction volume portion 214 functions to indicate to the user the total suction volume of the drainage by comparison with the liquid surface.

[Suction order]
In the surgical treatment of an affected part of the thoracic or abdominal cavity, when the thoracic or abdominal cavity is closed after treating the affected part, outflow of blood, etc. from the treated part of the affected part may continue even after closing the chest or abdomen. In this case, a drain tube connected to a drainage tube connected to a continuous low negative pressure suction system, which is an example of the suction system 200, is placed inside the thoracic or abdominal cavity. This allows drainage to be removed outside the patient's body after chest or abdomen closure. Depending on the case, multiple affected areas may be treated, and multiple drain tubes are placed according to the symptoms. For example, if the patient is critically ill, there may be three or more indwelling drain tubes.

When multiple drain tubes are used, the distal end of the drain tube is positioned at each of multiple locations in the patient's body where drainage tends to accumulate. Here, a suction device 215 can also be connected to each drain tube. However, connecting a suction device 215 to each drainage tube increases the size and cost of the suction system 200 because it is necessary to provide a plurality of suction devices 215 . Therefore, the opening of a plurality of suction paths is sequentially performed using a smaller number of suction devices 215 . As a result, it is possible to prevent the suction system 200 from increasing in size and cost.

Specifically, any one of a plurality of suction paths connected to one suction device 215 is opened to communicate with the suction device 215 . Then, all other suction channels are closed to block communication with the suction device 215 . After that, when a predetermined time has passed, any one of the closed suction paths is opened to communicate with the suction device 215 . Then, all other suction channels are closed to block communication with the suction device 215 . After that, when a predetermined time elapses, any one of the closed suction paths other than the previously opened suction path is opened to communicate with the suction device 215 . Then, all other suction channels are closed to block communication with the suction device 215 . Similarly, the suction paths to be opened are sequentially changed, and the drainage is sucked from any one of the plurality of suction paths.

Referring to FIG. 5, the suction system 200 includes a controller 219 that controls the solenoid mechanism 220. As shown in FIG. As an example, the control unit 219 is a computer having a processor (not shown) and a memory as a computer-readable non-temporary storage medium storing a control program. The processor controls the entire suction system 200 including the solenoid mechanism 220 and the suction device 215 based on the programs stored in the memory, and also controls various processes. Note that the control unit 219 may be realized by a hardware circuit, or may be realized as a logical device combining computer hardware and software.

The controller 219 controls the solenoid mechanism 220 to open the first suction tube 216A of the first suction route as one of the plurality of suction routes, and to open the remaining suction routes of the plurality of suction routes. The second and third suction tubes 216B and 216C of certain first and second suction paths are closed. After that, the control unit 219 controls the solenoid mechanism 220 to set the second suction path of the second suction path as another suction path different from the previously opened first suction path among the remaining suction paths. Along with opening the suction tube 216B, the first and third suction tubes 216A and 216C of the first and third suction paths are closed as other suction paths including the previously opened first suction path.

For example, the first solenoid mechanism 220A opens the first suction tube 216A first among the suction tubes 216, and closes the remaining suction tubes, the second suction tube 216B and the third suction tube 216C. As a result, the second suction tube 216B and the third suction tube 216C are pressed by the second solenoid mechanism 220B and the third solenoid mechanism 220C, and the liquid is discharged through the first drainage tube 211 and the third drainage tube 213. aspiration stops. On the other hand, the internal channel of the first suction tube 216A is not crushed. Therefore, the flow of air is not hindered, and the drainage is sucked through the first drainage tube 211 . The start of opening and the start of closing need not be simultaneous, and there may be a time lag between the two.

After a predetermined time has elapsed after the first suction tube 216A is opened, the second solenoid mechanism 220B switches the remaining suction tubes as a different suction tube from the previously opened first suction tube 216A. Open the second suction tube 216B. Here, the remaining suction tubes are two, the second suction tube 216B and the third suction tube 216C. Therefore, another suction tube different from the previously opened first suction tube 216A is either the second suction tube 216B or the third suction tube 216C. In addition, the first solenoid mechanism 220A and the third solenoid mechanism 220C close the first suction tube 216A and the third suction tube 216C as well as the other suction tubes including the previously opened first suction tube 216A. As a result, the first suction tube 216A and the third suction tube 216C are pressed by the first solenoid mechanism 220A and the third solenoid mechanism 220C, and the drainage through the first drainage tube 211 and the third drainage tube 213 is discharged. Aspiration stops. On the other hand, the internal channel of the second suction tube 216B is not crushed. Therefore, the flow of air is not obstructed, and the drainage is sucked through the second drainage tube 212 . It should be noted that the end of opening and the end of closing need not be simultaneous, and there may be a time lag between the two.

When the second suction tube 216B is opened, the remaining suction tubes of the plurality of suction tubes are the first suction tube 216A and the third suction tube 216C. Among the remaining suction tubes, the first suction tube 216A is included in the first suction path, which is the previously opened path. In this case, the control unit 219 controls the solenoid mechanism 220 to open the third suction tube 216C as another suction tube among the remaining suction tubes excluding the first suction tube 216A. In addition, the first solenoid mechanism 220A and the second solenoid mechanism 220B close the first suction tube 216A and the second suction tube 216B as the other suction tubes. As a result, the first suction tube 216A and the second suction tube 216B are pressed by the first solenoid mechanism 220A and the second solenoid mechanism 220B, and the drainage through the first drainage tube 211 and the second drainage tube 212 is discharged. Aspiration stops. On the other hand, the internal channel of the third suction tube 216C is not crushed. Therefore, the flow of air is not obstructed, and the drainage is sucked through the third drainage tube 213 .

This means that all of the suction tube 216 has been opened. Therefore, the control unit 219 controls the solenoid mechanism 220 to reopen the first suction tube 216A that was initially opened and to close the second suction tube 216B and the third suction tube 216C. Thereafter, opening and closing are sequentially performed in the same manner.

The operation of the solenoid mechanism 220 will be described in detail with reference to FIG. The solenoid mechanism 220 opens the suction tube 216 when in the ON state and closes the suction tube 216 when in the OFF state. At timing t0 immediately after the start of suction, the first solenoid mechanism 220A is turned on, and the first suction tube 216A is opened. At this time, the second solenoid mechanism 220B and the third solenoid mechanism 220C are in the OFF state, and the second suction tube 216B and the third suction tube 216C are closed. Therefore, the drainage tank 217 to which the first drainage tube 211 is connected communicates with the suction device 215, and only the first drainage tube 211 is in a suction state from timing t0 to t1.

At timing t1 after a predetermined time has elapsed from timing t0, the second solenoid mechanism 220B is turned on, and the second suction tube 216B is opened. At this time, the first solenoid mechanism 220A and the third solenoid mechanism 220C are in the OFF state, and the first suction tube 216A and the third suction tube 216C are closed. Therefore, the drainage tank 217 to which the second drainage tube 212 is connected communicates with the suction device 215, and only the second drainage tube 212 is in a suction state from timing t1 to t2.

At timing t2 after a predetermined time has elapsed from timing t1, the third solenoid mechanism 220C is turned on, and the third suction tube 216C is opened. At this time, the first solenoid mechanism 220A and the second solenoid mechanism 220B are in the OFF state, and the first suction tube 216A and the second suction tube 216B are closed. Therefore, the drainage tank 217 to which the third drainage tube 213 is connected communicates with the suction device 215, and only the third drainage tube 213 is in a suction state from timing t2 to t3. After that, when a predetermined time has elapsed from timing t2, the first solenoid mechanism 220A is turned on. Thereafter, similar opening and closing are repeated until the end of suction.

The controller 219 controls the solenoid mechanism 220 so that the plurality of suction paths are opened in order. As an example, the predetermined order of opening the plurality of suction paths is, if there is a first opened first path among the remaining suction paths of the plurality of suction paths, the first open path among the remaining suction paths It is set to open one other suction path out of the . Further, the predetermined order is set such that after all of the plurality of suction paths are opened, the first suction path opened is reopened.

Taking FIG. 5 as an example, when the first suction tube 216A of the suction tubes 216 is opened, the remaining suction tubes are the second suction tube 216B and the third suction tube 216C. Therefore, as another suction tube to be opened after the first suction tube 216A, either the second suction tube 216B or the third suction tube 216C is opened. When the second suction tube 216B is opened next, the other suction tube to be released next is the first of the remaining suction tubes, the first suction tube 216A and the third suction tube 216C. The opened first suction tube 216A is removed. Therefore, the third suction tube 216C is opened as another suction tube. As a result, all of the plurality of suction tubes are opened, and then the first suction tube 216A that was opened first is opened again.

According to the suction system 200 of the second embodiment described above, liquid can be sucked using a smaller number of suction sources when using a plurality of suction paths. Also, liquid can be efficiently sucked even if a plurality of suction paths are connected to one suction source. That is, the distal end portions of the plurality of suction paths can be arranged at the plurality of positions where the drainage tends to accumulate. Also, the amount of drainage aspirated from the peritoneal or thoracic cavity does not exceed the amount of body fluid leaking in the peritoneal or thoracic cavity. Therefore, when it is confirmed that the amount of leaking body fluid is large based on the amount of drained fluid sucked or the like, the doctor can perform treatment or measures as necessary.

Note that the solenoid mechanism 220 that is turned on next may be turned on from the off state slightly earlier than the solenoid mechanism 220 that was previously turned on is turned off. That is, a state may occur in which the two solenoid mechanisms 220 are in an overlapping ON state for a short period of time. This is because if the time is short, there is almost no effect on suction. Also, a state may occur in which all the solenoid mechanisms 220 are turned off for a short period of time.

[Third embodiment]
A suction system 300 of a third embodiment will be described with reference to FIGS. 7 to 11. FIG. The third embodiment differs from the first embodiment in that a plurality of cams are provided. FIG. 7 is a schematic diagram showing the aspiration system 300 with the first drainage tube 311 open. 8 is a schematic diagram showing the aspiration system 300 with the second drainage tube 312 closed. FIG. 9 is a schematic diagram showing the aspiration system 300 with the third drain tube 313 closed. In the states shown in FIGS. 7 to 9, the second drainage tube 312 and the third drainage tube 313 are closed, and saliva is sucked through the first drainage tube 311. FIG.

Also, FIG. 10 is an explanatory diagram for explaining changes in the rotation angle of the first cam 321A with respect to elapsed time. It shows the elapsed time from the start of rotation of the cam 321A. Also, FIG. 11 is a schematic cross-sectional view of the first cam 321A, the second cam 321B, and the third cam 321C. 11 shows a cross section passing through the rotation center CP indicated by a dashed line and perpendicular to the cam 321 side surface of the pressing portion 323, and shows a cross section viewed from a horizontal direction perpendicular to the rotation center CP. In the following description, the first cam 321A, the second cam 321B, and the third cam 321C may be collectively referred to simply as the cam 321.

As shown in FIG. 7, the suction system 300 includes, as an example of a plurality of suction paths, a first suction path including a first drainage tube 311 and the suction tube 16, and a second drainage tube 312 and the suction tube 16. A second suction path and a third suction path including the third drainage tube 313 and the suction tube 16 are provided. The first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 are arranged so as to overlap each other at a position facing the pressing portion 323 . In addition, in the following description, the first suction path, the second suction path, and the third suction path may be collectively referred to simply as a suction path.

The first drainage tube 311, the second drainage tube 312, and the third drainage tube 313 have internal channels through which saliva flows. The suction tube 16 has a passage through which air flows so that a suction pressure corresponding to the negative pressure generated by the pump 15 acts on the suction path. Act on pathways. A suction system 300 is connected to the first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 . The distal ends of the first drainage tube 311, the second drainage tube 312, and the third drainage tube 313 are left in the oral cavity of the patient. Saliva sucked by the suction system 300 flows through the internal channels of the first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 .

The suction system 300 also includes a cam mechanism 320 as an example of a closing portion that closes each of the plurality of suction paths. The cam mechanism 320 has a first cam 321A, a second cam 321B, and a third cam 321C, which are examples of rotating bodies. Each cam 321 has the same shape and rotates in the same direction around the center of rotation CP. For example, each cam 321 has a shape consisting of a circle centered on the center of rotation CP, excluding a fan-shaped arc portion with a central angle of 120°. The second cam 321B is tilted at 120° with respect to the first cam 321A, and the third cam 321C is tilted at 240° with respect to the first cam 321A. . At least two of the first cam 321A, the second cam 321B, and the third cam 321C may have different shapes. Also, the inclinations of the second cam 321B and the third cam 321C with respect to the first cam 321A may be different from each other. By varying the shape of the cam or the posture of the cam, it is possible to vary the length of time that each suction path is open.

However, in the example of FIG. 7, for convenience of explanation, only the first cam 321A with a rotation angle of 0° is shown. Actually, a second cam 321B (FIG. 8) and a third cam 321C (FIG. 9) are arranged at positions overlapping the first cam 321A in the extending direction of the rotation center CP. The cam mechanism 320 also has a motor 22 that rotates each cam 321 . When the cam 321 is rotated by the motor 22 , each of the first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 that are in contact with the cam 321 is compressed by the cam 321 and the pressing portion 323 . pinched and pressed by As a result, the internal flow path is crushed, and each of the first drainage tube 311, the second drainage tube 312, and the third drainage tube 313 is closed. Therefore, in the crushed drainage tube, the flow of saliva is impeded and the suction stops. In the example of FIG. 7, the internal flow path is not crushed in the first drainage tube 311 that is not compressed by the first cam 321A. Therefore, the flow of saliva is not hindered, and saliva is sucked through the first drainage tube 311 in the direction indicated by the arrow DA.

Furthermore, the suction path is provided with a saliva reservoir 17 for storing saliva as an example of a liquid reservoir. 7 to 9, the saliva reservoir 17 is arranged between the first drainage tube 311, the second drainage tube 312, the third drainage tube 313, and the suction tube 16. In the example shown in FIGS. A first drainage tube 311 , a second drainage tube 312 and a third drainage tube 313 are connected to the saliva tank 17 . Saliva sucked through the first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 is accumulated in the saliva reservoir 17 . The first drainage tube 311, the second drainage tube 312, and the third drainage tube 313 are connected to the saliva tank 17 via connecting tubes branched into three. However, each of the first drainage tube 311 , the second drainage tube 312 , and the third drainage tube 313 may be individually connected to the saliva tank 17 .

[Suction order]
The sequence of suction will be described with reference to FIGS. 7 to 9. FIG. The suction system 300 has a control section 19 that controls the cam mechanism 320 . The control unit 19 controls the cam mechanism 320 to open the first suction path including the first drainage tube 311 , the second suction path including the second drainage tube 312 , and the third suction path including the third drainage tube 313 . One of the suction paths is opened, and the remaining suction paths of the first, second and third suction paths are closed. For example, the control section 19 controls the rotational speed of the cam 321 of the cam mechanism 320 . After that, the control unit 19 controls the cam mechanism 320 to open another suction path, which is different from the previously opened suction path, among the remaining suction paths, and to open the first suction path and the second suction path. Of the second suction path and the third suction path, the other suction paths including the previously opened one suction path are closed.

For example, the cam mechanism 320 first opens the first drainage tube 311 as shown in FIG. At this time, the first cam 321A whose rotation angle is 0° does not press the first drainage tube 311 . Therefore, the first suction path including the first drainage tube 311 is open. The flow of saliva is not impeded, and saliva is sucked through the first drainage tube 311 in the direction indicated by the arrow DA. At this time, the cam mechanism 320 closes the second and third drainage tubes 312 and 313 of the remaining second and third suction paths, as shown in FIGS.

That is, the second cam 321B, which is inclined by 120° with respect to the first cam 321A, presses the second drainage tube 312 as shown in FIG. Therefore, the second suction path including the second drainage tube 312 is closed. The suction of saliva through the second drainage tube 312 is stopped. Similarly, the third cam 321C, which is inclined 240° with respect to the first cam 321A, presses the third drainage tube 313, as shown in FIG. Therefore, the third suction path including the third drainage tube 313 is closed. The suction of saliva through the third drainage tube 313 is stopped. For convenience of explanation, only the second cam 321B is shown in the example of FIG. 8, and only the third cam 321C is shown in the example of FIG. However, actually, the second cam 321B and the third cam 321C are arranged at positions overlapping the first cam 321A in the extending direction of the rotation center CP.

After that, the cam mechanism 320 sequentially opens one of the plurality of suction paths and closes the other remaining suction paths. That is, when each cam 321 rotates, the cam mechanism 320 opens the third suction path as another suction path different from the previously opened first suction path. That is, the cam mechanism 320 opens the third drainage tube 313 of the third suction path. In addition, the cam mechanism 320 closes the first suction path and the second suction path as other suction paths including the previously opened first suction path. After that, when each cam 321 rotates further, the cam mechanism 320 opens the second suction path as another suction path. That is, the cam mechanism 320 opens the second drainage tube 312 of the second suction path. In addition, the cam mechanism 320 closes the first and third suction paths as other suction paths.

The operation of the first cam 321A that rotates once every 60 seconds will be described in detail with reference to FIG. First, when the elapsed time at the start of rotation is 0 seconds, the rotation angle of the first cam 321A is 0°. At this time, the first drainage tube 311 is open, and the second drainage tube 312 and the third drainage tube 313 are closed. That is, as shown in FIG. 11A, the first cam 321A is separated from the first drainage tube 311, and the first drainage tube 311 is open. On the other hand, the second cam 321 B presses the second drainage tube 312 and the third cam 321 C presses the third drainage tube 313 . Therefore, the second drainage tube 312 and the third drainage tube 313 are closed.

When 10 seconds have passed and the rotation angle of the first cam 321A is 60°, the first and second drainage tubes 311 and 312 are closed, and the third drainage tube 313 is opened. ing. That is, as shown in FIG. 11B, the third cam 321C is separated from the third drainage tube 313, and the third drainage tube 313 is open. On the other hand, the first cam 321 A presses the first drainage tube 311 and the second cam 321 B presses the second drainage tube 312 . Therefore, the first drainage tube 311 and the second drainage tube 312 are closed.
ing.

When 30 seconds have passed and the rotation angle of the first cam 321A is 180°, the first drainage tube 311 and the third drainage tube 313 are closed, and the second drainage tube 312 is open. . That is, as shown in FIG. 11C, the second cam 321B is separated from the second drainage tube 312, and the second drainage tube 312 is open. On the other hand, the first cam 321 A presses the first drainage tube 311 and the third cam 321 C presses the third drainage tube 313 . Therefore, the first drainage tube 311 and the third drainage tube 313 are closed.

When 50 seconds have passed and the rotation angle of the first cam 321A is 60°, the first drainage tube 311 is opened again, and the second drainage tube 312 and the third drainage tube 313 are closed. there is That is, the first drainage tube 311 is open, while the second drainage tube 312 and the third drainage tube 313 are closed. Thereafter, similar opening and closing are repeated until the end of suction.

With the suction system 300 of the third embodiment described above, liquid can be sucked using a smaller number of suction sources when a plurality of suction paths are used. Also, liquid can be efficiently sucked even if a plurality of suction paths are connected to one suction source. In other words, the distal ends of the plurality of drainage tubes can be arranged at respective positions where saliva tends to accumulate. Furthermore, since saliva can be intermittently and reliably sucked from each drainage tube, it is possible to reduce the frequency of periodic confirmation of the state of accumulation of saliva.

It should be noted that instead of the three cams 321, a single cam having recesses corresponding to the respective drainage tubes may be used. For example, the thickness of the cam (that is, the height in the direction in which the center of rotation CP extends) is the height of the first drainage tube 311, the second drainage tube 312, and the third drainage tube 313. It may be configured to be As an example, the cam has a substantially columnar shape as if the first cam 321A, the second cam 321B, and the third cam 321C are pasted together and integrated. In this case, among the first drainage tube 311, the second drainage tube 312, and the third drainage tube 313, the concave portion faces the opened drainage tube. Therefore, the drainage tube facing the recess is opened. On the other hand, the remaining drainage tubes are compressed and closed by the cams. Then, when the cam rotates, the concave portion formed at another location faces the drain tube to be opened next. As the cam rotates further, the next opening of the drainage tube faces the recess formed at another location. Even with a cam having such a shape, it is possible to sequentially open a plurality of suction paths.

Although the present invention has been described with reference to each embodiment, the present invention is not limited to the above embodiments. Inventions modified within the scope of the present invention and inventions equivalent to the present invention are also included in the present invention. Further, each embodiment and each modification can be appropriately combined within a range not contrary to the present invention.

For example, each drainage tube or the tip of each drain tube may be placed inside another part of the patient's body (eg, the trachea). Further, the control units 19 and 219 may open another suction path after a predetermined amount of liquid has accumulated in the liquid tank corresponding to the suction path after opening one suction path. Also, the saliva tank 17 of the suction system 100 or the suction system 300 may have the suction amount portion 214 .

Also, the suction system 200 may have the cam mechanism 20 or the cam mechanism 320 . In this case, the control unit 219 opens and closes the first drainage tube 211, the second drainage tube 212, and the third drainage tube 213 by the cam mechanism 20 or the cam mechanism 320, and the first suction by the solenoid mechanism 220. The opening and closing of tube 216A, second suction tube 216B, and third suction tube 216C are synchronized.

11: First drainage tube (first suction path)
12: Second drainage tube (second suction route)
15: pump (suction part)
16: suction tube (suction path)
17: saliva tank (liquid tank)
19: Control unit 20: Cam mechanism (closing unit)
21: cam 22: motor 100: suction system 200: suction system 211: first drainage tube (first suction path)
212: Second drainage tube (second suction route)
213: Third drainage tube (third suction route)
214: suction amount unit 215: suction device (suction unit)
216A: First suction tube (first suction path)
216B: Second suction tube (second suction path)
216C: Third suction tube (third suction path)
217: drainage tank (liquid tank)
219: Control unit 220: Solenoid mechanism 300: Suction system 311: First drainage tube (first suction path)
312: Second drainage tube (second suction route)
313: Third drainage tube (third suction route)
320: cam mechanism (closing part)
321A: First cam (cam)
321B: Second cam (cam)
321C: Third cam (cam)

Claims (8)

A suction system for applying a suction pressure for suctioning liquid from a patient to a plurality of suction paths,
a closing portion that closes each of the plurality of suction paths;
One of the plurality of suction paths is opened, the remaining suction paths of the plurality of suction paths are closed, and then another suction path different from the one of the remaining suction paths is opened. a control unit that controls the closing unit so as to open a suction channel and close other suction channels including the one suction channel among the plurality of suction channels. 2. The suction system according to claim 1, wherein said control section controls said closing section so as to open said another suction path after a predetermined time has elapsed since opening said one suction path. wherein, if there is a first open path that has been opened first among the remaining suction paths, the control unit opens the other suction path from among the remaining suction paths excluding the first open path; 3. A suction system according to claim 1 or 2, wherein said closing part is controlled to reopen said one suction channel after all said plurality of suction channels are opened. further comprising a suction unit that generates the suction pressure acting on the plurality of suction paths,
The suction system according to any one of claims 1 to 3, wherein the suction path is provided with a liquid tank for storing the liquid. 5. The suction system according to claim 4, wherein said liquid tank has a suction amount section indicating a suction amount of said liquid that has been suctioned. 6. A suction system according to any one of claims 1 to 5, wherein the closing portion comprises a solenoid mechanism for closing the internal flow path of each of the plurality of suction paths. 6. The closing part according to any one of claims 1 to 5, wherein the closing part has a cam that presses and closes a part of each of the plurality of suction paths, and a motor that rotates the cam. suction system. A control method for an aspiration system comprising a closing portion for applying a suction pressure for aspirating liquid from a patient to a plurality of aspiration channels and closing each of the plurality of aspiration channels, comprising:
One of the plurality of suction paths is opened, the remaining suction paths of the plurality of suction paths are closed, and then another suction path different from the one of the remaining suction paths is opened. A method of controlling a suction system, comprising: controlling the closing part so as to open a suction channel and close other suction channels including the one suction channel among the plurality of suction channels.

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