JP2018061731A - Flow forming unit and thoracic drainage including the same - Google Patents

Abstract

A flow forming unit connectable to a container provided in a suction line, which can reduce the frequency of stopping the formation of a fluid flow toward the container, and can cope with fluctuations in pressure in the container. Providing a flow forming unit. A flow forming unit (200) having a first pump unit (210) capable of forming a fluid flow toward the container (100) and a first pump unit capable of forming a fluid flow toward the container (100). A connection unit (230) capable of connecting the pump unit and the container (100) such that the two pump units (220), the first pump unit (210) and the second pump unit (220) are in parallel with each other; When only one of the first pump unit (210) and the second pump unit (220) is being driven and the driving condition for driving the other pump unit is satisfied, at least the other pump unit is driven. And a control unit (240). [Selection] Figure 8

Description

  The present invention relates to a flow forming unit connectable to a container provided in the middle of a suction line.

  2. Description of the Related Art Conventionally, a suction device provided in a suction line for sucking gas and liquid in a body cavity such as a breast cavity and liquid such as breast milk is known. For example, Patent Document 1 discloses a suction device including a container provided in a suction line and a piezoelectric pump capable of forming a fluid flow toward the container by sucking a gas in the container. The piezoelectric pump is connected to the container via a tube. The piezoelectric pump has a piezoelectric element and a diaphragm that vibrates due to expansion and contraction of the piezoelectric element. For this reason, when the diaphragm vibrates, the gas in the container is sucked through the tube, and thus liquid (such as breast milk) is stored in the container.

Japanese Patent No. 5850210

  In the suction device as shown in Patent Document 1, when the piezoelectric pump stops during suction by the device due to a decrease in the usable period of the piezoelectric pump or damage of the piezoelectric pump, the fluid flowing toward the container Flow formation (suction) is not continued. Further, when air leakage from the suction line increases during the operation of the suction device, the pressure in the container may be maintained at a predetermined set negative pressure (maintaining a predetermined suction pressure). It becomes difficult.

  An object of the present invention is a flow forming unit that can be connected to a container provided in a suction line, and is capable of reducing the frequency of stopping the formation of a fluid flow toward the container and responding to fluctuations in pressure in the container. Providing a flow-forming unit capable of providing a thoracic drainage comprising the flow-forming unit.

  As means for solving the above-mentioned problems, the present invention is a flow forming unit that is connectable to a container provided in a suction line and forms a flow of fluid toward the container, the first piezoelectric element and the first A first pump unit including a first piezoelectric pump including a first diaphragm that vibrates by expansion and contraction of one piezoelectric element, and capable of forming a fluid flow toward the container; a second piezoelectric element; and the second piezoelectric element Including a second piezoelectric pump including a second diaphragm that vibrates due to expansion and contraction of the first pump unit, and a second pump unit capable of forming a fluid flow toward the container, the first pump unit, and the second pump unit. A connecting portion capable of connecting the pump unit and the container so as to be parallel to each other, and any one of the first pump unit and the second pump unit. When the driving condition is satisfied that the only during driving the first pump unit to drive the other pump units, and a control unit for driving at least the other pump units, providing a flow forming unit.

  The flow forming unit includes at least two pump units, and the control unit drives at least the other pump unit when the driving condition is satisfied while driving any one of the pump units. For this reason, for example, even if the usable period of one pump unit is reduced by setting the driving condition that the usable period of one pump unit is less than a predetermined period, the other pump The unit continues to form a fluid flow toward the container. Further, for example, the fact that the suction force by only one pump unit has not reached the set suction force (the pressure in the container has not reached the set negative pressure) is set as the driving condition, so that one pump Even when it is difficult to maintain the pressure in the container at the set negative pressure only by driving the unit, the pressure in the container can be maintained at the set negative pressure by simultaneously driving the two pump units. It becomes possible. Therefore, the present flow forming unit can be connected to the container to reduce the frequency of stopping the formation of the fluid flow toward the container and to cope with fluctuations in pressure in the container.

  In this case, the driving condition includes a switching condition for switching from a driving state of only one of the pump units to a driving state of only the other pump unit, and the control unit is in a state of driving only the one pump unit. When the switching condition is satisfied, it is preferable to stop the one pump unit and drive the other pump unit.

  In this case, for example, by setting the switching condition that the usable period of one pump unit is shortened or that one pump unit has a problem, even in such a case, Since the driving state of one pump unit is switched to the driving state of the other pump unit, the formation of the fluid flow toward the container is continued.

  In the flow forming unit, the driving condition includes a plurality of driving conditions for switching from a driving state of only the one pump unit to a driving state of the one pump unit and the other pump unit, and the control unit includes: It is preferable that the other pump unit is also driven when the plurality of driving conditions are satisfied while only the one pump unit is being driven.

  In this way, for example, the fact that the suction force by only one of the pump units has not reached the set suction force (the pressure in the container has not reached the set negative pressure) is set as the plurality of drive conditions. Thus, even in such a case, since the two pump units are driven simultaneously, it is possible to prevent the pressure in the container from reaching the set negative pressure.

  Further, in the flow forming unit, when the control unit drives the first pump unit and the second pump unit from a state where both the first pump unit and the second pump unit are stopped, It is preferable to drive preferentially from the pump unit with the shorter usable period of the usable period of the first pump unit and the usable period of the second pump unit.

  In this way, the pump unit with the shorter usable period is consumed first.

  Further, in the flow forming unit, the connection portion includes a first flow path that connects the container and the first pump unit, a first on-off valve provided in the first flow path, the container, A second flow path that connects the second pump unit; and a second on-off valve provided in the second flow path, wherein the control unit drives the drive while driving only the first pump unit. When the condition is satisfied, it is preferable to open at least the second on-off valve and drive the second pump unit.

  In this way, the influence of the pressure fluctuation generated in the second pump unit during driving of the first pump unit is suppressed, and the fluid is sucked by the second pump unit when the driving condition is satisfied.

  In the flow forming unit, the first pump unit includes a third piezoelectric pump connected in series with the first piezoelectric pump, and the third piezoelectric pump includes a third piezoelectric element and the third piezoelectric pump. A third diaphragm that vibrates due to expansion and contraction of the element, wherein the second pump unit includes a fourth piezoelectric pump connected in series with the second piezoelectric pump, and the fourth piezoelectric pump includes a fourth diaphragm It is preferable to include a piezoelectric element and a fourth diaphragm that vibrates due to expansion and contraction of the fourth piezoelectric element.

  In this way, since the suction force by each pump unit is increased, it is possible to effectively form a fluid flow toward the container with a single pump unit.

  The present invention further includes the flow forming unit and the container, the container being capable of storing liquid discharged from the thoracic cavity, and the flow forming unit being downstream of the container in the suction line. A thoracic drainage is provided that is provided on a side and forms a fluid flow from the thoracic cavity toward the container by aspirating the gas in the container.

  As described above, according to the present invention, the flow forming unit is connectable to the container provided in the suction line, and the frequency of stopping the formation of the fluid flow toward the container is reduced, and the pressure in the container is reduced. A flow forming unit capable of coping with fluctuations and a thoracic drainage comprising said flow forming unit can be provided.

It is a front view of the suction device of one embodiment of the present invention. It is a right view of the suction device of FIG. It is a rear view of the suction device of FIG. It is a perspective view of a container. It is a perspective view of a suction unit. It is sectional drawing in the VI-VI line of FIG. It is a perspective view which shows the state from which the cover of the suction unit was removed. It is the schematic of the suction line containing a suction device. It is a flowchart which shows the control content of a control part.

  A suction device 1 according to an embodiment of the present invention will be described with reference to FIGS. In the present embodiment, a thoracic drainage is shown as the suction device 1. Moreover, although the attitude | position at the time of use of this attraction | suction apparatus 1 is not specifically limited, in the following description, an up-down direction is defined based on FIGS. 1-3.

  The suction device 1 of this embodiment includes a container 100 provided in a suction line, and a flow forming unit that forms a flow of fluid toward the container 100. In this embodiment, a container used for chest drainage (a container capable of storing liquid discharged from the patient's chest cavity) is shown as the container 100, and is detachable from the container 100 as a flow forming unit. A suction unit 200 is shown that can be fitted and that creates a flow of fluid from the thoracic cavity toward the container 100 by aspirating the gas in the container 100.

  The container 100 is provided in the middle of the suction line for sucking the gas and liquid in the body cavity of the patient. The container 100 includes a storage part 110 and a water seal part 120.

  The reservoir 110 stores a fluid such as a body fluid that has flowed out of the patient's body cavity through the first tube 11 (see FIG. 8). An inflow portion 112 that allows the liquid to flow into the storage portion 110 is connected to the upper portion of the storage portion 110. The inflow portion 112 is connectable to the first tube 11 and has a shape that allows the inside of the patient's body cavity and the storage portion 110 to communicate with each other via the first tube 11.

  The water sealing part 120 is adjacent to the storage part 110. Sterile distilled water (water sealing liquid) is injected into the water sealing part 120. The inside of the water seal part 120 is connected to the inside of the storage part 110. For this reason, the gas which flowed into the storage part 110 from the inside of the patient's anti-air flows into the water seal part 120. The upper part of the water seal part 120 is connected to a storage part 110 and a discharge part 122 that discharges the gas that has passed sterile distilled water out of the container 100. The discharge part 122 has a shape that can be connected to the second tube 12 and allows the inside of the second tube 12 to communicate with the inside of the water seal part 120.

  In the present embodiment, as shown in FIGS. 4 and 6, the container 100 has a pair of attachment portions 130 for attaching the suction unit 200 to the container 100. One of the pair of attachment portions 130 is formed in a portion of the outer surface of the storage portion 110 facing the water seal portion 120, and the other of the pair of attachment portions 130 is a reservoir of the outer surface of the water seal portion 120. It is formed at a portion facing the portion 110. Each attachment portion 130 has a shape extending linearly along the vertical direction.

  The suction unit 200 is a unit that can be detachably connected to the container 100 and sucks the gas in the container 100. The suction unit 200 sucks the gas in the container 100 through the second tube 12, the filter unit 300 and the third tube 13. As shown in FIG. 8, the suction unit 200 includes at least a first pump unit 210 and a second pump unit 220, a connection unit 230 that connects each pump unit 210, 220 and the third tube 13, and a control unit 240. And a case 250.

  The first pump unit 210 has a first piezoelectric pump 211. The first piezoelectric pump 211 includes a first piezoelectric element 211a and a first diaphragm 211b that vibrates due to expansion and contraction of the first piezoelectric element 211a. The first pump unit 210 has a mounting portion 210 a that can be detachably mounted to the case 250.

  The second pump unit 220 has a second piezoelectric pump 221. The second piezoelectric pump 221 includes a second piezoelectric element 221a and a second diaphragm 221b that vibrates due to expansion and contraction of the second piezoelectric element 221a. The second pump unit 220 has a mounting portion 220 a that can be detachably mounted to the case 250.

  In the present embodiment, the first pump unit 210 has a third piezoelectric pump 213 connected in series to the first piezoelectric pump 211, and the second pump unit 220 is connected in series to the second piezoelectric pump 221. The fourth piezoelectric pump 224 is provided. The structures of the second piezoelectric pump 213 and the fourth piezoelectric pump 224 are the same as those of the first piezoelectric pump 211. A usable period is set for each piezoelectric pump.

  The connection part 230 connects these pump units 210 and 220 and the 3rd tube 13 so that the 1st pump unit 210 and the 2nd pump unit 220 may become mutually parallel. The connection unit 230 is connected to the downstream end of the third tube 13, and the first flow unit linking the downstream end of the third flow channel 233 and the first pump unit 210. It has a channel 231 and a second channel 232 connecting the downstream end of the third channel 233 and the second pump unit 220. The first flow path 231 is provided with a first on-off valve V1, and the second flow path 232 is provided with a second on-off valve V2. A pressure sensor 235 is provided in the third flow path 233.

  The case 250 houses the pump units 210 and 220, the connection unit 230, and the control unit 240. A connection part 251 for connecting the third tube 13 is provided on the upper part of the case 250. The connecting portion 251 has a shape that allows the inside of the third tube 13 and the inside of the connecting portion 230 to communicate with each other. The case 250 can be detachably connected to the container 100. A pair of guide grooves 252 for guiding the case 250 is formed on the outer surface of the case 250 so that the case 250 slides in the vertical direction along the attachment portions 130. The case 250 is slid upward along the attachment portions 130 from the state in which the guide grooves 252 are positioned below the attachment portions 130 and the guide grooves 252 and the attachment portions 130 overlap each other. Is attached to the container 100. For this reason, displacement of the case 250 (suction unit 200) in the direction orthogonal to the guide grooves 252 with respect to the container 100 is restricted. As shown in FIG. 2, at the position where the case 250 is fitted in a normal position with respect to the container 100, the case 250 is attached to the water seal portion 120 of the container 100 by the locking portion 253 provided on the case 250. It is fixed to the side part 120s. In this state, since the locking portion 253 is engaged with the side portion 120s of the water seal portion 120, the drop of the suction unit 200 from the container 100 is suppressed. Further, in a state where the locking portion 253 is engaged with the side portion 120s of the water sealing portion 120, the locking portion 253 is provided on the side of the water sealing portion 120 by the lock portion 255 (see FIG. 5) provided in the case 250. Displacement in a direction away from the portion 120s is restricted. FIG. 7 shows a state where the lid 254 (see FIG. 3) of the case 250 is removed.

  The controller 240 drives at least the other pump unit when the drive condition for driving the other pump unit is satisfied while only one of the first pump unit 210 and the second pump unit 220 is being driven. To drive. The driving condition includes a switching condition for switching from a driving state of only one of the pump units to a driving state of only the other pump unit, and the one pump unit and the other pump from the driving state of only the one pump unit. And a plurality of driving conditions for switching to the driving state of the unit. That is, for example, when the switching condition is satisfied while only the first pump unit 210 is driven, the control unit 240 switches to the driving state of only the second pump unit 220. In addition, for example, when the plurality of driving conditions are satisfied while only the first pump unit 210 is driven, the control unit 240 drives the second pump unit 220 in addition to the first pump unit 210. Here, the switching condition is satisfied when the usable period of the one pump unit becomes zero during driving of only the one pump unit (for example, when at least one of the piezoelectric element and the diaphragm deteriorates). It is determined. In the multiple drive condition, when the suction force of only one of the pump units does not reach the set suction force while only the one pump unit is driven, in this embodiment, the detected negative pressure P of the pressure sensor 235 is set negative. It is determined that the pressure Ps has not been reached (when it is greater than the set negative pressure Ps).

  Specifically, the control unit 240 includes a switching condition determination unit 241, a multiple drive condition determination unit 242, a usable period determination unit 243, and a switching unit 244.

  The switching condition determination unit 241 determines whether or not the first usable period T1 that is the usable period of the first pump unit 210 is zero, or the second usable period that is the usable period of the second pump unit 220. It is determined whether T2 is zero. Each usable period is stored in a memory built in each pump unit 210, 220.

  The multiple drive condition determination unit 242 determines whether or not the detected negative pressure P of the pressure sensor 235 is greater than the set negative pressure Ps during driving of only the one pump unit.

  The usable period determination unit 243 determines a pump unit having a shorter usable period among the first usable period T1 and the second usable period T2.

  The switching unit 244 receives a predetermined signal from each of the switching condition determination unit 241, the multiple drive condition determination unit 242, and the usable period determination unit 243. Based on the signal, the switching unit 244 switches driving and stopping of the pump units 210 and 220 and switching of the on-off valves V1 and V2.

  Hereinafter, specific control contents of the control unit 240 will be described with reference to FIG.

  When the suction device is stopped, the on-off valves V1 and V2 are closed, and the pump units 210 and 220 are stopped. In this state, when a predetermined set negative pressure Ps is set as the pressure in the container 100 and the suction device 1 is driven, the controller 240 (usable period determination unit 243) causes the first pump unit 210 to perform the first operation. It is determined whether the usable period T1 is equal to or shorter than the second usable period T2 of the second pump unit 220 (step S11). As a result, when the first usable period T1 is equal to or shorter than the second usable period T2, the control unit 240 (switching unit 244) switches the first pump unit 210 (the first piezoelectric pump 211 and the third piezoelectric pump 213). While driving, the first on-off valve V1 is opened (step S12). On the other hand, when the first usable period T1 is longer than the second usable period T2, the control unit 240 (switching unit 244) drives the second pump unit 220 (the second piezoelectric pump 221 and the fourth piezoelectric pump 224). At the same time, the second on-off valve V2 is opened (step S32). The control flow after step S12 and the control flow after step S32 differ only in that the control related to each pump unit 210, 220 and each on-off valve V1, V2 is opposite to each other. Only the control flow after S12, that is, the control flow after the first usable period T1 is equal to or shorter than the second usable period T2 (in the case of YES in step S11) will be described. For this reason, in FIG. 9, illustration of the control flow after step S32 is abbreviate | omitted.

  After step S12, the control unit 240 (multiple drive condition determination unit 242) determines whether or not the multiple drive condition is satisfied, that is, whether or not the detected negative pressure P of the pressure sensor 235 is greater than the set negative pressure Ps. Is determined (step S13).

  As a result, when the detected negative pressure P is larger than the set negative pressure Ps (when the plural drive conditions are satisfied), in other words, the suction force is insufficient when only the first pump unit 210 is driven. In this case, the control unit 240 (switching unit 244) drives the second pump unit 220 (second piezoelectric pump 221 and fourth piezoelectric pump 224) and opens the second on-off valve V2 (step S14). In this state (a state where both the first pump unit 210 and the second pump unit 220 are driven), the control unit 240 determines again whether or not the detected negative pressure P is larger than the set negative pressure Ps. (Step S15). As a result, when the detected negative pressure P is equal to or lower than the set negative pressure Ps, the control unit 240 returns to step S15. On the other hand, when the detected negative pressure P is still larger than the set negative pressure Ps, the control unit 240 An alarm is generated (step S16). In addition, as an example of the alarm generation, the generation of an alarm sound indicating that there is a leak (the patient's lung hole is enlarged, the connection state between the first tube 11 and the inflow portion 112 is deteriorated, etc.) The display of an alarm on the LCD built in the case 250 and the lighting of a pilot lamp built in the case 250 can be mentioned. After this warning, the operator takes appropriate measures.

  On the other hand, if the detected negative pressure P is equal to or lower than the set negative pressure Ps in step S13 (NO in step S13), in other words, if the suction force is sufficient by driving only the first pump unit 210, the control unit 240 Updates the first usable period T1 (step S17). Then, the control unit 240 (switching condition determination unit 241) determines whether or not the switching condition is satisfied, that is, whether or not the first usable period T1 is zero (step S18).

  As a result, when the first usable period T1 is larger than zero, that is, when the suction by the first pump unit 210 can be continued, the control unit 240 determines that the first usable period T1 is the set period Ts (for example, 24 hours) or less (step S19). When the first usable period T1 is greater than the set period Ts, the control unit 240 returns to step S13, while when the first usable period T1 is equal to or less than the set period Ts, the control unit 240 issues an alarm. Generated (step S20), and the process returns to step S13. Examples of this alarm generation include an alarm indicating replacement of the pump unit, display of an alarm on the LCD built in the case 250, and lighting of a pilot lamp built in the case 250.

  If the first usable period T1 is zero in step S18 (YES in step S18), the control unit 240 generates an alarm (step S21). Then, after step S21 or simultaneously with step S21, the control unit 240 (switching unit 244) stops the first pump unit 210 and closes the first on-off valve V1 (step S22), and the second pump unit 220. And the second on-off valve V2 is opened (step S23). Thereby, the suction state by only the first pump unit 210 is switched to the suction state by only the second pump unit 220. Therefore, the suction of the gas in the container 100 is continued. In addition, since the first on-off valve V <b> 1 is closed, air is prevented from flowing into the second flow path 232 from the outside through the first flow path 231. Note that step S22 and step S23 may be performed in this order, in the reverse order, or may be performed simultaneously.

  When the suction state with only the first pump unit 210 is switched to the suction state with only the second pump unit 220, the used first pump unit whose first usable period T1 becomes zero is a new first pump unit. It is preferable to replace with 210.

  Next, the control unit 240 determines whether the detected negative pressure P is greater than the set negative pressure Ps (step S24). As a result, when the detected negative pressure P is greater than the set negative pressure Ps, the control unit 240 generates an alarm (step S25). On the other hand, when the detected negative pressure P is equal to or lower than the set negative pressure Ps, the control unit 240 updates the second usable period T2 (step S26). Then, the control unit 240 (switching condition determination unit 241) determines whether or not the second usable period T2 is zero (step S27).

  As a result, when the second usable period T2 is greater than zero, that is, when the second pump unit 220 can continue the suction, the control unit 240 determines that the second usable period T2 is equal to or shorter than the set period Ts. It is determined whether or not there is (step S28). When the second usable period T2 is greater than the set period Ts, the control unit 240 returns to step S24, while when the second usable period T2 is equal to or less than the set period Ts, the control unit 240 issues an alarm. Generated (step S29), and the process returns to step S24.

  On the other hand, when the second usable period T2 is zero (YES in step S27), the control unit 240 generates an alarm (step S30). Here, after switching from suction by the first pump unit 210 to suction by the second pump unit 220, if the used first pump unit is replaced with a new first pump unit 210, the control unit 240 performs the step After S30 or simultaneously with step S30, the process returns to step S12.

  As described above, the suction unit 200 of the suction device 1 of the present embodiment includes the two pump units 210 and 220, and the control unit 240 drives only one pump unit (for example, the first pump unit 210). When the switching condition is satisfied, one pump unit is stopped and the other pump unit is driven. For this reason, even when the usable period of the one pump unit is shortened (for example, when it becomes zero), it is switched from the driving state of one pump unit to the driving state of the other pump unit. The suction of the gas in the container 100 is continued. Note that the switching condition may be set such that a problem occurs in one pump unit or the one pump unit is removed from the case 250 while the one pump unit is being driven.

  The control unit 240 also drives the other pump unit when the plurality of driving conditions are satisfied while only one pump unit is being driven. For this reason, even if the pressure in the container does not reach the set negative pressure Ps, the two pump units 210 and 220 are driven simultaneously, so the pressure in the container 100 does not reach the set negative pressure Ps. It is suppressed.

  In addition, when the switching condition is satisfied while only one pump unit is being driven, the control unit 240 has an open / close valve provided in a flow path connecting the one pump unit and the third flow path 233. close up. Therefore, it is suppressed that air flows into the other pump unit from the outside through the flow path.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, the suction unit 200 may have three or more pump units.

  Further, in the above-described embodiment, an example in which it is determined that a plurality of driving conditions are satisfied when the detected negative pressure P does not reach the set negative pressure Ps has been shown. However, the suction force by one pump unit is set suction The condition indicating that the force is not reached is not limited to this. For example, instead of the pressure sensor 235, a flow rate sensor may be provided in the third flow path 233, and it may be determined that the multiple drive condition is satisfied when the detection value of the flow rate sensor does not reach the set flow rate.

  Further, in steps S19 and S20, an example in which an alarm is generated when the first usable period T1 is equal to or shorter than the set period Ts is shown, but a plurality of periods may be set as the set period Ts. . That is, when the first usable period T1 becomes equal to or shorter than the first set period (for example, 24 hours), the first alarm is generated, and the first usable period T1 is shorter than the first set period. (For example, 12 hours), the second warning is generated, and then, when the first usable period T1 becomes equal to or shorter than the third set period (for example, 1 hour) shorter than the second set period, 3 A second alarm may be generated.

  Further, the flow forming unit may be provided on the upstream side of the container 100 in the suction line.

1 Suction device (chest drainage)
DESCRIPTION OF SYMBOLS 100 Container 110 Storage part 120 Water seal part 200 Suction unit (flow formation unit)
210 1st pump unit 211 1st piezoelectric pump 211a 1st piezoelectric element 211b 1st diaphragm 213 3rd piezoelectric pump 220 2nd pump unit 221 2nd piezoelectric pump 221a 2nd piezoelectric element 221b 2nd diaphragm 224 4th piezoelectric pump 230 connection Part 231 first flow path 232 second flow path 233 third flow path 240 control section 250 case 300 filter unit V1 first on-off valve V2 second on-off valve

Claims (7)

A flow forming unit that is connectable to a container provided in the suction line and forms a flow of fluid toward the container,
A first pump unit including a first piezoelectric pump including a first piezoelectric element and a first diaphragm that vibrates due to expansion and contraction of the first piezoelectric element, and capable of forming a fluid flow toward the container;
A second pump unit including a second piezoelectric pump including a second piezoelectric element and a second diaphragm that vibrates due to expansion and contraction of the second piezoelectric element, and capable of forming a fluid flow toward the container;
A connecting portion capable of connecting the pump unit and the container so that the first pump unit and the second pump unit are parallel to each other;
A controller that drives at least the other pump unit when a driving condition for driving the other pump unit is satisfied while only one of the first pump unit and the second pump unit is being driven; A flow forming unit. The flow forming unit of claim 1, wherein
The drive condition includes a switching condition for switching from the drive state of only the one pump unit to the drive state of only the other pump unit,
The flow control unit is configured to stop the one pump unit and drive the other pump unit when the switching condition is satisfied while only the one pump unit is driven. The flow forming unit according to claim 1 or 2,
The drive condition includes a plurality of drive conditions for switching from the drive state of only the one pump unit to the drive state of the one pump unit and the other pump unit,
The control unit is a flow forming unit that also drives the other pump unit when the plurality of driving conditions are satisfied while only the one pump unit is driven. The flow forming unit according to any of claims 1 to 3,
When the control unit drives the first pump unit and the second pump unit from a state in which both the first pump unit and the second pump unit are stopped, the usable period of the first pump unit And a flow forming unit that is driven preferentially from a pump unit having a shorter usable period among usable periods of the second pump unit. A flow forming unit according to any of claims 1 to 4,
The connecting portion is
A first flow path connecting the container and the first pump unit;
A first on-off valve provided in the first flow path;
A second flow path connecting the container and the second pump unit;
A second on-off valve provided in the second flow path,
The control unit is a flow forming unit that opens at least the second on-off valve and drives the second pump unit when the driving condition is satisfied while only the first pump unit is driven. A flow forming unit according to any of claims 1 to 5,
The first pump unit includes a third piezoelectric pump connected in series with the first piezoelectric pump, and the third piezoelectric pump vibrates by expansion and contraction of the third piezoelectric element and the third piezoelectric element. A third diaphragm,
The second pump unit includes a fourth piezoelectric pump connected in series with the second piezoelectric pump, and the fourth piezoelectric pump vibrates by expansion and contraction of the fourth piezoelectric element and the fourth piezoelectric element. A flow forming unit comprising: a fourth diaphragm; A flow forming unit according to any of claims 1 to 6;
The container,
The container is capable of storing liquid drained from the thoracic cavity;
The thoracic drainage, wherein the flow forming unit is provided downstream of the container in the suction line, and forms a flow of fluid from the thoracic cavity toward the container by sucking a gas in the container.

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