JP2023157231A - Liquid discharge device and liquid discharge method - Google Patents

Abstract

To provide a liquid discharge device, etc. that can more accurately discharge liquid to a predetermined part in a nasal cavity.SOLUTION: A liquid discharge device 10 comprises: a first nozzle 14 for discharging first liquid when it is inserted into one nasal cavity 3; and a second nozzle 16 for generating a first air flow flowing to the other nasal cavity 4 from the one nasal cavity 3 by sucking air when it is inserted into the other nasal cavity 4.SELECTED DRAWING: Figure 2

Description

The present invention relates to a liquid ejection device and a liquid ejection method for ejecting liquid to a user.

2. Description of the Related Art Liquid ejection devices and the like for ejecting liquid into a user's nasal cavity are known. As an example of a liquid ejection device, etc., Patent Document 1 discloses that a gas flow entrained with a drug is applied to one of the patient's nostrils with a driving pressure such that it passes around the rear part of the nasal septum and exits from the patient's other nostril. A nasal delivery device is disclosed that includes a delivery unit for delivery into the nares.

Patent No. 4543553

However, the nasal delivery device of Patent Document 1 has a problem in that it is difficult to discharge liquid to a predetermined site within the nasal cavity.

The present invention is intended to solve the above-mentioned problems, and its purpose is to provide a liquid ejection device and the like that can more accurately eject liquid to a predetermined site within the nasal cavity.

To achieve the above object, a liquid ejection device according to one aspect of the present invention includes a first nozzle that ejects a first liquid when inserted into one nasal cavity, and a first nozzle that ejects a first liquid when inserted into the other nasal cavity. and a second nozzle that generates a first airflow flowing from the one nasal cavity to the other nasal cavity by inhaling air at the nasal cavity.

According to this aspect, since it is possible to generate the first airflow flowing from one nasal cavity to the other nasal cavity, the first liquid discharged from the first nozzle can be carried on the first airflow, By placing the first liquid on the first airflow, it is possible to suppress diffusion of the first liquid. Therefore, the first liquid can be more accurately discharged to a predetermined site within the nasal cavity.

For example, in the liquid ejection device according to one aspect of the present invention, the second nozzle is inserted into the other nasal cavity, and the liquid is ejected from the first nozzle inserted into the one nasal cavity. The device may further include a liquid detection unit that sucks the first liquid and detects the first liquid sucked into the second nozzle.

According to this aspect, when the first liquid is not detected by the liquid detection unit, it can be presumed that the first liquid has adhered to a predetermined site within the nasal cavity. Furthermore, if the first liquid is detected by the liquid detection section, it can be estimated that the first liquid is not being ejected to a predetermined site within the nasal cavity. In this way, it is possible to estimate whether or not the first liquid has adhered to a predetermined site within the nasal cavity, so that the first liquid can be more accurately discharged to the predetermined site within the nasal cavity.

For example, in the liquid ejection device according to one aspect of the present invention, after the first nozzle ejects the first liquid, the liquid detection unit detects the first liquid sucked into the second nozzle. The device may further include a time measurement unit that measures the time until detection.

According to this aspect, since the time from when the first nozzle discharges the first liquid to when the liquid detection section detects the first liquid can be measured, the speed of the first airflow can be determined based on the time. By adjusting the speed of the first airflow, etc., the first liquid can be more accurately discharged to a predetermined site within the nasal cavity.

For example, the liquid ejection device according to one aspect of the present invention may further include a calculation unit that calculates the distance by multiplying the speed of the first airflow and the time measured by the time measurement unit. .

According to this aspect, the distance can be calculated by multiplying the speed of the first airflow and the time measured by the time measuring section, so the speed of the first airflow, etc. can be adjusted based on the distance, and the speed of the first airflow, etc. can be adjusted based on the distance. By adjusting the speed of the first airflow, etc., the first liquid can be more accurately discharged to a predetermined site within the nasal cavity.

For example, the liquid ejection device according to one aspect of the present invention may further include an airflow control section that controls the first airflow based on the distance calculated by the calculation section.

According to this aspect, the first airflow can be controlled based on the distance calculated by multiplying the speed of the first airflow by the time measured by the time measuring section, and the first airflow can be controlled. Accordingly, the first liquid can be more accurately ejected to a predetermined site within the nasal cavity.

For example, the liquid ejection device according to one aspect of the present invention may further include an ejection control unit that ejects the first liquid from the first nozzle while the first airflow is generated. .

According to this aspect, it becomes easier to carry the first liquid discharged from the first nozzle in the first airflow, and it is possible to further suppress diffusion of the first liquid. Therefore, the first liquid can be more accurately ejected to a predetermined site within the nasal cavity.

For example, in the liquid ejection device according to one aspect of the present invention, the first nozzle is inserted into the one nasal cavity and sucks air, thereby causing the second nozzle to flow from the other nasal cavity to the one nasal cavity. An air current may also be generated.

According to this aspect, the second airflow flowing from the other nasal cavity to the one nasal cavity can be generated, so that the first liquid discharged from the first nozzle can be retained in the nasal cavity by the second airflow. I can do it. Therefore, the first liquid can be more accurately ejected to a predetermined site within the nasal cavity.

For example, in the liquid ejection device according to one aspect of the present invention, the second nozzle may eject the second liquid while being inserted into the other nasal cavity.

According to this aspect, since the second liquid can be ejected from the second nozzle inserted into the other nasal cavity, it is possible to avoid cases where it is difficult to eject the first liquid to a predetermined site within the nasal cavity. The second liquid can be ejected to the predetermined site even when the nasal cavity is closed, and the second liquid can be ejected more accurately to the predetermined site within the nasal cavity.

For example, the liquid ejection device according to one aspect of the present invention may detect the first airflow and the second airflow based on the measurement results of an electroencephalogram measurement unit that measures brain waves of a user who uses the liquid ejection device. The airflow control unit may further include an airflow control unit that controls at least one of them.

According to this aspect, at least one of the first airflow and the second airflow can be controlled based on the measurement result of the electroencephalogram measuring section, and by controlling at least one of the first airflow and the second airflow, The first liquid can be more accurately ejected to a predetermined site within the nasal cavity.

Further, the liquid ejection method according to one aspect of the present invention includes a ejection step of ejecting a first liquid from a first nozzle inserted into one nasal cavity, and a second nozzle inserted into the other nasal cavity. generating a first airflow flowing from the one nasal cavity to the other nasal cavity by sucking air into the nozzle of the nasal cavity.

According to this aspect, the same effects as those of the liquid ejection device described above are achieved.

Note that the present invention can be realized not only as a liquid ejection device including such a characteristic processing section, but also as a control method in which steps are processes executed by the characteristic processing section included in the liquid ejection device. It can be realized. Further, it can also be realized as a program for causing a computer to function as a characteristic processing section included in a liquid ejection device or a program for causing a computer to execute a characteristic step included in a control method. It goes without saying that such programs can be distributed via computer-readable non-transitory recording media such as CD-ROMs (Compact Disc-Read Only Memory) and communication networks such as the Internet. .

According to the liquid ejection device and the like according to one aspect of the present invention, liquid can be ejected more accurately to a predetermined site within the nasal cavity.

FIG. 1 is a perspective view showing a liquid ejection device according to a first embodiment. FIG. 2 is a schematic diagram showing the liquid ejection device of FIG. 1. FIG. 3 is a block diagram showing the functional configuration of the liquid ejecting device of FIG. 1. As shown in FIG. FIG. 4 is a flowchart showing an example of the operation of the liquid ejection device of FIG. FIG. 5 is a schematic diagram showing a liquid ejection device according to the second embodiment. FIG. 6 is a flowchart showing an example of the operation of the liquid ejection device of FIG. FIG. 7 is an explanatory diagram for explaining an example of the operation of the liquid ejecting device shown in FIG. FIG. 8 is a schematic diagram showing a liquid ejecting device according to a third embodiment. FIG. 9 is a flowchart illustrating an example of the operation of the liquid ejecting device of FIG. 8. FIG. 10 is a table for explaining an example of the operation of the liquid ejecting device shown in FIG. 8. FIG. 11 is a first explanatory diagram for explaining an example of the operation of the liquid ejecting device of FIG. 8. FIG. FIG. 12 is a second explanatory diagram for explaining an example of the operation of the liquid ejecting device of FIG. 8. FIG. FIG. 13 is a schematic diagram showing the electroencephalogram measuring section and the like.

Hereinafter, embodiments of the present invention will be described in detail using the drawings. Note that the embodiments described below are all inclusive or specific examples. The numerical values, shapes, materials, components, arrangement positions and connection forms of the components, steps, order of steps, etc. shown in the following embodiments are merely examples, and do not limit the present invention. Further, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims will be described as arbitrary constituent elements.

(First embodiment)
FIG. 1 is a perspective view showing a liquid ejection device 10 according to the first embodiment. FIG. 2 is a schematic diagram showing the liquid ejecting device 10 of FIG. 1. 1 and 2, the width direction (horizontal direction) of the liquid ejection device 10 is the X-axis direction, the depth direction (front-back direction) of the liquid ejection device 10 is the Y-axis direction, and the height of the liquid ejection device 10 is The direction (vertical direction) will be explained as the Z-axis direction. Further, in FIG. 2, the main body portion 12, the first nozzle 14, and the second nozzle 16 are shown in cross section.

The liquid ejection device 10 is a nasal spray dispenser for ejecting liquid into the nasal cavity 2 of the user 1 (see the two-dot chain line in FIG. 2). For example, the liquid ejection device 10 is a nasal delivery device that ejects an aerosol and delivers the aerosol to the nasal cavity 2 of the user 1 . For example, the liquid discharged by the liquid discharge device 10 is a chemical liquid or the like, and includes an aerosol. The nasal cavity 2 includes one nasal cavity 3 and the other nasal cavity 4, and the one nasal cavity 3 and the other nasal cavity 4 communicate with each other. As shown in FIGS. 1 and 2, the liquid ejection device 10 includes a main body 12, a first nozzle 14, a second nozzle 16, an ejection section 18, a suction section 20, and a liquid detection section 22. , a time measurement section 24, an operation reception section 26, a control section 28, and a power supply section 30.

Also, here, aerosol generally refers to a state in which fine solid or liquid particles are suspended in the air, but their visibility and color vary; for example, fog, smoke, dust, etc. are also considered aerosols. It is a type of microorganism, and its particle size is thought to be about 0.001 μm to 100 μm. In this embodiment, in addition to the liquid ejection described above, a similar effect can be obtained even if the liquid is ejected as an aerosol.

The main body portion 12 is a member that connects the first nozzle 14 and the second nozzle 16. In this embodiment, the main body portion 12 is formed in the shape of a hollow rectangular parallelepiped.

The first nozzle 14 discharges the first liquid while being inserted into one nasal cavity 3. In this embodiment, the first nozzle 14 discharges the first liquid discharged from the discharge section 18. For example, the first liquid discharged from the first nozzle 14 is in the form of mist. The first nozzle 14 protrudes from the main body 12. The first nozzle 14 has a cylindrical shape, and the space inside the first nozzle 14 communicates with the space inside the main body 12 .

The second nozzle 16 generates a first airflow flowing from one nasal cavity 3 to the other nasal cavity 4 by inhaling air while being inserted into the other nasal cavity 4 (see the dotted arrow in FIG. 2). reference). In the present embodiment, the second nozzle 16 is inserted into the other nasal cavity 4 and the suction unit 20 sucks the air, thereby sucking air in the nasal cavity 2 from one nasal cavity 3 to the other nasal cavity 4. A first airflow is generated that flows through the air. In this embodiment, the second nozzle 16 is inserted into the other nasal cavity 4 and sucks the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3. I can do it. In the present embodiment, the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3 and not attached to the nasal cavity 2 is carried by the first airflow to the other nasal cavity 4. It is sucked into the inserted second nozzle 16. The second nozzle 16 protrudes from the main body 12 and is provided alongside the first nozzle 14. The second nozzle 16 has a cylindrical shape, and the space inside the second nozzle 16 communicates with the space inside the main body 12 .

The discharge unit 18 is a discharge machine that holds a first liquid and discharges the held first liquid. For example, a flow path (not shown) is formed between the discharge part 18 and the first nozzle 14 through which the first liquid discharged from the discharge part 18 passes. The first liquid is discharged from the first nozzle 14 through the flow path. In this embodiment, the discharge part 18 is housed in the main body part 12. Note that, for example, the discharge section 18 may be accommodated in the first nozzle 14. For example, the discharge section 18 includes a cartridge (not shown) and a heater chip (not shown) for discharging the first liquid stored in the cartridge. For example, the ejection unit 18 ejects a predetermined amount (for example, about several tens of microliters) of the first liquid in the form of mist using a thermal inkjet method.

The suction unit 20 is a suction machine that sucks air. For example, a flow path (not shown) is formed between the suction unit 20 and the second nozzle 16, and the air in the nasal cavity 2 is transferred to the second nozzle by the suction unit 20 sucking air. It is sucked into the nozzle 16. In this embodiment, the suction section 20 is housed in the main body section 12. Note that, for example, the suction section 20 may be housed in the second nozzle 16. For example, the suction unit 20 includes a fan (not shown) and a motor (not shown) that rotates the fan.

The liquid detection unit 22 is a sensor that detects the first liquid sucked into the second nozzle 16. In other words, the liquid detection unit 22 detects the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3 and sucked into the second nozzle 16 inserted into the other nasal cavity 4. Detect. In this embodiment, the liquid detection section 22 is housed in the main body section 12. Note that, for example, the liquid detection section 22 may be housed in the second nozzle 16. For example, the liquid detection section 22 is an optical sensor, and detects the first liquid by irradiating the first liquid that has passed through the liquid detection section 22 with light.

The time measurement unit 24 is a timer that measures the time from when the first nozzle 14 discharges the first liquid until when the liquid detection unit 22 detects the first liquid sucked into the second nozzle 16. be. For example, since the timing at which the first liquid is ejected from the ejection unit 18 and the timing at which the first liquid is ejected from the first nozzle 14 are approximately the same, the time measurement unit 24 determines that the ejection unit 18 is By starting the measurement at the timing when the first liquid is ejected and ending the measurement at the timing when the liquid detection unit 22 detects the first liquid, the measurement is started after the first nozzle 14 ejects the first liquid. The time until the liquid detection unit 22 detects the first liquid sucked into the second nozzle 16 is measured. In this embodiment, the time measuring section 24 is housed in the main body section 12. Note that, for example, the time measuring section 24 may be provided outside the main body section 12.

The operation accepting unit 26 accepts an operation by the user 1. In this embodiment, the operation reception section 26 is provided on the side surface of the main body section 12. In this embodiment, when the operation reception unit 26 receives an operation by the user 1, the first nozzle 14 discharges the first liquid, and the second nozzle 16 discharges the air outside the liquid discharge device 10. Inhale. For example, the operation reception unit 26 is a push button, a touch button, a switch, or the like.

The control unit 28 controls the discharge of the first liquid from the first nozzle 14 and the first airflow generated by the second nozzle 16. In this embodiment, the control section 28 is housed in the main body section 12. For example, the control unit 28 is a control board on which a control circuit and the like for controlling the ejection of the first liquid from the first nozzle 14 and the first airflow generated by the second nozzle 16 are mounted. .

The power supply unit 30 supplies power to the discharge unit 18, the suction unit 20, the liquid detection unit 22, the time measurement unit 24, the control unit 28, and the like. The discharge section 18 , the suction section 20 , the liquid detection section 22 , the time measurement section 24 , the control section 28 , and the like operate based on the power supplied from the power supply section 30 . In this embodiment, the power supply section 30 is housed in the main body section 12. For example, the power supply unit 30 may be a battery or the like, or may be a board on which a circuit for supplying power supplied from an external power source via an adapter is mounted.

FIG. 3 is a block diagram showing the functional configuration of the liquid ejection device 10 of FIG. 1. As shown in FIG.

As shown in FIG. 3, the control section 28 includes a discharge control section 32, an airflow control section 34, and a calculation section 36.

The discharge control unit 32 controls discharge of the first liquid from the first nozzle 14 . In this embodiment, the discharge control section 32 controls the discharge of the first liquid from the first nozzle 14 by controlling the discharge section 18 . For example, when the operation reception unit 26 receives an operation by the user 1, the discharge control unit 32 causes the discharge unit 18 to discharge the first liquid, and the first nozzle 14 to discharge the first liquid.

For example, the discharge control unit 32 causes the first liquid to be discharged from the first nozzle 14 while the first airflow is generated. For example, the discharge control unit 32 determines whether the airflow control unit 34 is operating the suction unit 20 when the operation reception unit 26 receives an operation by the user 1, and the airflow control unit 34 determines whether or not the suction unit 20 is operating. By operating the discharge unit 18 and discharging the first liquid from the first nozzle 14 while the first airflow is being generated, the first liquid is discharged from the first nozzle 14 while the first airflow is being generated. Discharge liquid.

The airflow control unit 34 controls the first airflow. In this embodiment, the airflow control unit 34 controls the first airflow by controlling the suction unit 20. For example, when the operation reception unit 26 receives an operation by the user 1, the airflow control unit 34 causes the suction unit 20 to suck air, causes the second nozzle 16 to suck air, and generates the first airflow. .

For example, the airflow control unit 34 controls the first airflow based on the distance calculated by the calculation unit 36. For example, the airflow control unit 34 controls the suction period of the suction unit 20 such that the longer the distance calculated by the calculation unit 36 is, the longer the period of generation of the first airflow becomes. do. Further, for example, the airflow control unit 34 controls the suction force by the suction unit 20 such that the longer the distance calculated by the calculation unit 36 is, the faster the speed of the first airflow is, and controls the speed of the first airflow. do. For example, the first airflow generation period is the first airflow generation period after the first liquid is discharged.

The calculation unit 36 calculates the distance by multiplying the speed of the first airflow by the time measured by the time measurement unit 24. For example, the speed of the first airflow is determined by the airflow control section 34, and the calculation section 36 acquires the speed of the first airflow from the airflow control section 34.

FIG. 4 is a flowchart showing an example of the operation of the liquid ejecting device 10 of FIG.

As shown in FIG. 4, when the liquid ejection device 10 is used by the user 1, the first nozzle 14 and the second nozzle 16 are first inserted into the nasal cavity 2 (step S1). Specifically, the first nozzle 14 is inserted into one nasal cavity 3, and the second nozzle 16 is inserted into the other nasal cavity 4.

When the first nozzle 14 and the second nozzle 16 are inserted into the nasal cavity 2, the operation reception unit 26 accepts an operation by the user 1 (step S2). For example, if the operation reception unit 26 is a push button, the operation reception unit 26 is pressed by the user 1.

When the operation reception unit 26 receives the operation by the user 1, the airflow control unit 34 generates a first airflow (generation step) (step S3). For example, the airflow control unit 34 generates the first airflow by controlling the suction unit 20 to cause the second nozzle 16 to suck air.

When the airflow control unit 34 generates the first airflow, the discharge control unit 32 discharges the first liquid from the first nozzle 14 (discharge step) (step S4). For example, the discharge control section 32 controls the discharge section 18 to discharge the first liquid from the first nozzle 14 . For example, the discharge control unit 32 causes the first liquid to be discharged from the first nozzle 14 after a predetermined period has elapsed since the first airflow was generated.

When the discharge control section 32 discharges the first liquid from the first nozzle 14, the liquid detection section 22 detects the first liquid sucked into the second nozzle 16 (step S5). For example, when the first liquid discharged from the first nozzle 14 rides on the first airflow and is sucked into the second nozzle 16, the liquid detection unit 22 detects the first liquid that has been sucked into the second nozzle 16. 1 liquid is detected.

When the liquid detection unit 22 detects the first liquid sucked into the second nozzle 16, the time measurement unit 24 measures the time until the first liquid is detected (step S6). For example, the time measuring section 24 starts measuring at the timing when the discharging section 18 discharges the first liquid, and ends the measurement at the timing when the liquid detecting section 22 detects the first liquid. The time from when the first liquid is ejected from the nozzle 14 until when the liquid detection unit 22 detects the first liquid is measured.

When the time measurement unit 24 measures the time, the calculation unit 36 calculates the distance (step S7). Specifically, the calculation unit 36 calculates the distance by multiplying the speed of the first airflow and the time measured by the time measurement unit 24.

When the calculation unit 36 calculates the distance, the airflow control unit 34 determines the generation period of the first airflow based on the distance calculated by the calculation unit 36 (step S8). For example, when it is desired to eject liquid to a predetermined region 5 (see FIG. 2) in the nasal cavity 2, the airflow control section 34 moves the liquid from the first nozzle 14 to the predetermined region 5 based on the distance calculated by the calculation section 36. and determines the generation period of the first airflow based on the estimated distance. For example, the airflow control unit 34 determines the generation period of the first airflow such that the longer the distance, the longer the generation period of the first airflow. More specifically, the total distance R is calculated from the time T elapsed from the start of ejection until the sensor (liquid detection unit 22) detects it by the time measurement unit 24 and the speed V set by the airflow control unit 34, so that the total distance R is R=T× Calculated in V. Furthermore, for example, in the case of the predetermined site 5, the distance can be set to 45% of the total distance, and a point where R×0.45=R1 can be determined as a suitable distance for the aerosol to reach.

For example, after the airflow control unit 34 determines the generation period of the first airflow, the liquid ejection device 10 performs steps S1 to S4 described above again. When steps S1 to S4 described above are performed again, the airflow control unit 34 controls the first airflow for the generation period determined in step S8 after the first liquid is ejected from the first nozzle 14 in step S4. generate. As a result, the first airflow can be generated only for a period corresponding to the position of the predetermined region 5, and the first liquid discharged from the first nozzle 14 can be more reliably discharged to the predetermined region 5. I can do it.

Note that, for example, the liquid ejecting device 10 may perform only steps S1 to S4. In this case, for example, the airflow control unit 34 generates the first airflow only for a predetermined generation period.

Further, for example, the liquid ejecting device 10 may include an operation receiving unit that receives an operation by the user 1 to set the generation period and speed of the first airflow.

As described above, in the liquid ejecting device 10, by placing the first liquid on the first airflow, it is possible to suppress the first liquid from spreading, so that the first liquid adheres to areas other than the predetermined areas 5. This allows the first liquid to be more reliably discharged to the predetermined portion 5. In addition, in the liquid ejection device 10, the first airflow can be controlled according to the position of the predetermined region 5, so if the user 1 is an adult, for example, the generation period of the first airflow can be made longer, for example. If the user 1 is a child, the first liquid can be more reliably discharged to the predetermined region 5 by shortening the period during which the first airflow is generated.

The liquid ejection device 10 according to the first embodiment has been described above.

The liquid ejection device 10 according to the present embodiment includes a first nozzle 14 that ejects a first liquid when inserted into one nasal cavity 3, and a first nozzle 14 that inhales air when inserted into the other nasal cavity 4. and a second nozzle 16 that generates a first airflow flowing from one nasal cavity 3 to the other nasal cavity 4.

According to this aspect, the first airflow flowing from one nasal cavity 3 to the other nasal cavity 4 can be generated, so that the first liquid discharged from the first nozzle 14 can be carried on the first airflow. By placing the first liquid on the first airflow, it is possible to suppress diffusion of the first liquid. Therefore, the first liquid can be more accurately discharged from the predetermined site 5 within the nasal cavity 2.

In addition, in the liquid ejection device 10 according to the present embodiment, the second nozzle 16 is inserted into the other nasal cavity 4, and the liquid is ejected from the first nozzle 14 inserted into one nasal cavity 3. The apparatus further includes a liquid detection section 22 that sucks the first liquid sucked into the second nozzle 16 and detects the first liquid sucked into the second nozzle 16.

According to this aspect, when the first liquid is not detected by the liquid detection unit 22, it can be presumed that the first liquid has adhered to the predetermined site 5 within the nasal cavity 2. Further, when the first liquid is detected by the liquid detection unit 22, it can be estimated that the first liquid is not attached to the predetermined region 5 within the nasal cavity 2. In this way, it is possible to estimate whether or not the first liquid has adhered to the predetermined site 5 within the nasal cavity 2, so that the first liquid can be more accurately discharged to the predetermined site 5 within the nasal cavity 2. .

Furthermore, in the liquid ejection device 10 according to the present embodiment, after the first nozzle 14 ejects the first liquid, the liquid detection unit 22 detects the first liquid sucked into the second nozzle 16. It further includes a time measuring section 24 that measures the time until the end.

According to this aspect, since the time from when the first nozzle 14 discharges the first liquid to when the liquid detection unit 22 detects the first liquid can be measured, the first air flow is determined based on the time. By adjusting the speed, etc. of the first airflow, the first liquid can be more accurately discharged to a predetermined site 5 within the nasal cavity 2.

The liquid ejection device 10 according to the present embodiment further includes a calculation unit 36 that calculates the distance by multiplying the speed of the first airflow by the time measured by the time measurement unit 24.

According to this aspect, the distance can be calculated by multiplying the speed of the first airflow and the time measured by the time measurement unit 24, so the speed of the first airflow, etc. can be adjusted based on the distance, By adjusting the speed of the first airflow, etc., the first liquid can be more accurately discharged to a predetermined region 5 within the nasal cavity 2.

The liquid ejection device 10 according to the present embodiment further includes an airflow control section 34 that controls the first airflow based on the distance calculated by the calculation section 36.

According to this aspect, the first airflow can be controlled based on the distance calculated by multiplying the speed of the first airflow and the time measured by the time measurement unit 24, and the first airflow can be controlled. This allows the first liquid to be more accurately discharged to the predetermined site 5 within the nasal cavity 2.

Further, the liquid ejection device 10 according to the present embodiment further includes an ejection control unit 32 that causes the first liquid to be ejected from the first nozzle 14 in a state where the first airflow is generated.

According to this aspect, the first liquid discharged from the first nozzle 14 can be easily carried on the first airflow, and the diffusion of the first liquid can be further suppressed. Therefore, the first liquid can be more accurately discharged to the predetermined site 5 within the nasal cavity 2.

Further, the liquid discharging method according to the present embodiment includes a discharging step (step S4) of discharging the first liquid from the first nozzle 14 inserted into one nasal cavity 3, and a discharging step (step S4) of discharging the first liquid from the first nozzle 14 inserted into the other nasal cavity 4. and a generation step (step S3) of generating a first airflow flowing from one nasal cavity 3 to the other nasal cavity 4 by causing the second nozzle 16 in the closed state to inhale air.

According to this aspect, the same effects as those of the liquid ejection device 10 described above are achieved.

(Second embodiment)
FIG. 5 is a schematic diagram showing a liquid ejecting device 10a according to the second embodiment. In addition, in FIG. 5, the main body part 12, the 1st nozzle 14, and the 2nd nozzle 16 are shown in cross section.

The liquid ejection device 10a has the following features: the first nozzle 14 generates a second airflow flowing from the other nasal cavity 4 to the one nasal cavity 3; and the second nozzle 16 discharges the second liquid. This is mainly different from the discharge device 10. In the following, differences from the liquid ejection device 10 will be mainly explained.

As shown in FIG. 5, the liquid ejection device 10a includes a main body portion 12, a first nozzle 14, a second nozzle 16, flow path forming portions 38, 40, ejection portions 42, 44, and a suction portion. 46, liquid detection sections 48 and 50, and a time measurement section 24. Although not shown, the liquid ejecting device 10a includes an operation reception section 26, a control section 28, and a power supply section 30. Regarding the main body section 12, time measurement section 24, operation reception section 26, control section 28, and power supply section 30, detailed explanation will be omitted here by referring to the explanation in the first embodiment described above.

The first nozzle 14 discharges the first liquid while being inserted into one nasal cavity 3. In this embodiment, the first nozzle 14 discharges the first liquid discharged from the discharge section 42 .

The first nozzle 14 generates a second airflow flowing from the other nasal cavity 4 to the one nasal cavity 3 by inhaling air while being inserted into one nasal cavity 3 . That is, the first nozzle 14 generates a second airflow that flows in the opposite direction to the first airflow. In this embodiment, the first nozzle 14 is inserted into one of the nasal cavities 3, and the suction unit 46 sucks air from the first nozzle 14 side (see the dashed-dotted line arrow in FIG. 5). The air in the nasal cavity 2 is inhaled to generate a second airflow flowing from the other nasal cavity 4 to one nasal cavity 3. In this embodiment, the first nozzle 14 is inserted into one nasal cavity 3 and sucks the second liquid discharged from the second nozzle 16 inserted into the other nasal cavity 4. I can do it. In the present embodiment, the second liquid discharged from the second nozzle 16 inserted into the other nasal cavity 4 and not attached to the nasal cavity 2 is carried by the second airflow to the one nasal cavity 3. It is sucked into the first nozzle 14 in the inserted state.

The second nozzle 16 discharges the second liquid while being inserted into the other nasal cavity 4 . In this embodiment, the second nozzle 16 discharges the second liquid discharged from the discharge section 44. For example, the second liquid discharged from the second nozzle 16 is in the form of mist.

The second nozzle 16 generates a first airflow flowing from one nasal cavity 3 to the other nasal cavity 4 by inhaling air while being inserted into the other nasal cavity 4 . In this embodiment, the second nozzle 16 is inserted into the other nasal cavity 4 and the suction unit 46 sucks air from the second nozzle 16 side (see the double-dashed line arrow in FIG. 5). ) Inhale the air in the nasal cavity 2 and generate a first airflow flowing from one nasal cavity 3 to the other nasal cavity 4. In this embodiment, the second nozzle 16 is inserted into the other nasal cavity 4 and sucks the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3. Can be done. In the present embodiment, the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3 and not attached to the nasal cavity 2 is carried by the first airflow to the other nasal cavity 4. It is sucked into the inserted second nozzle 16.

The flow path forming portion 38 is cylindrical and forms a flow path that connects the space inside the first nozzle 14 and the suction portion 46 .

The flow path forming portion 40 has a cylindrical shape and forms a flow path that connects the space inside the second nozzle 16 and the suction portion 46 .

The discharge unit 42 is a discharge machine that holds a first liquid and discharges the held first liquid. For example, the discharge section 42 discharges the first liquid in the same manner as the discharge section 18 . The discharge part 42 is provided in a flow path formed by the flow path forming part 38, and the liquid discharged from the discharge part 42 is discharged from the first nozzle 14 through the flow path.

The discharge unit 44 is a discharge machine that holds a second liquid and discharges the held second liquid. For example, the discharge section 44 discharges the second liquid in the same manner as the discharge section 18. The discharge part 44 is provided in a flow path formed by the flow path forming part 40, and the second liquid discharged from the discharge part 44 is discharged from the second nozzle 16 through the flow path. Ru.

The suction unit 46 is a suction machine that sucks air. For example, the air in the nasal cavity 2 can be removed by the suction unit 46 sucking the air in the flow path formed by the flow path forming unit 38 with the first nozzle 14 inserted into one of the nasal cavities 3. It is sucked into the first nozzle 14. Further, for example, the air in the nasal cavity 2 can be obtained by suctioning the air in the flow path formed by the flow path forming unit 40 by the suction unit 46 while the second nozzle 16 is inserted into the other nasal cavity 4. is sucked into the second nozzle 16. For example, the suction unit 46 includes a fan (not shown) and a motor (not shown) that rotates the fan.

The liquid detection unit 48 is a sensor that detects the second liquid sucked into the first nozzle 14. In other words, the liquid detection unit 48 detects the second liquid discharged from the second nozzle 16 inserted into the other nasal cavity 4 and sucked into the first nozzle 14 inserted into one nasal cavity 3. Detect. In this embodiment, the liquid detection section 48 is housed in the main body section 12. Note that, for example, the liquid detection section 48 may be housed in the first nozzle 14. For example, the liquid detection section 48 detects the second liquid in the same manner as the liquid detection section 22.

The liquid detection unit 50 is a sensor that detects the first liquid sucked into the second nozzle 16. In other words, the liquid detection unit 50 detects the first liquid discharged from the first nozzle 14 inserted into one nasal cavity 3 and sucked into the second nozzle 16 inserted into the other nasal cavity 4. Detect. In this embodiment, the liquid detection section 50 is housed in the main body section 12. Note that, for example, the liquid detection section 50 may be housed in the second nozzle 16. For example, the liquid detection section 50 detects the first liquid in the same manner as the liquid detection section 22.

The discharge control unit 32 controls the discharge of the first liquid from the first nozzle 14 and the discharge of the second liquid from the second nozzle 16 . In this embodiment, the discharge control section 32 controls the discharge of the first liquid from the first nozzle 14 by controlling the discharge section 42 . Further, in this embodiment, the discharge control section 32 controls the discharge of the second liquid from the second nozzle 16 by controlling the discharge section 44 .

The airflow control unit 34 controls the first airflow and the second airflow. In this embodiment, the airflow control unit 34 controls the first airflow and the second airflow by controlling the suction unit 46.

FIG. 6 is a flowchart showing an example of the operation of the liquid ejecting device 10a of FIG.

In the following, differences from the example of the operation of the liquid ejecting device 10 described above will be mainly explained.

As shown in FIG. 6, when the discharge control unit 32 discharges the first liquid from the first nozzle 14 (step S4), the airflow control unit 34 generates a second airflow (step S11). For example, the airflow control unit 34 stops the first airflow by reversing the direction of suction by the suction unit 46, and generates the second airflow by causing the first nozzle 14 to suck air. For example, the airflow control unit 34 may determine the generation period, speed, etc. of the second airflow depending on the position of the predetermined region 5. For example, the second airflow generation period is the second airflow generation period after the second liquid is discharged.

FIG. 7 is an explanatory diagram for explaining an example of the operation of the liquid ejecting device 10a of FIG. 5. As shown in FIG.

For example, as shown in FIG. 7A, the discharge control unit 32 causes the first liquid 6 to be discharged from the first nozzle 14 while the first airflow is being generated.

As shown in FIG. 7B, after the first liquid 6 is discharged from the first nozzle 14, the airflow control unit 34 stops the first airflow and generates a second airflow.

As shown in FIG. 7(c), by generating the second airflow, it is possible to suppress the first liquid 6 discharged from the first nozzle 14 from passing through the predetermined region 5. 1 liquid 6 can be retained in a predetermined region 5.

Note that, for example, for a predetermined portion 7 where it is difficult to eject the first liquid 6 from the first nozzle 14, it is easy to eject the second liquid to a predetermined location by ejecting the second liquid from the second nozzle 16. It can be discharged to part 7 of.

For example, the liquid ejection device 10a determines whether to eject the first liquid from the first nozzle 14 or the second liquid from the second nozzle 16, depending on the operation received by the operation reception unit 26. You may. Specifically, for example, when the operation reception unit 26 is a push button, when the user 1 momentarily presses the operation reception unit 26, the liquid ejection device 10a generates the first airflow, and then The first liquid may be ejected from the first nozzle 14, and then the second airflow may be generated. Further, for example, in the case where the operation reception unit 26 is a push button, when the user 1 presses and holds the operation reception unit 26, the liquid ejection device 10a generates the second airflow and then releases the second nozzle 16. The second liquid may be ejected from the air, and then the first airflow may be generated. Note that, for example, the liquid ejection device 10a includes a first operation reception unit that receives an operation for ejecting the first liquid from the first nozzle 14, and a second operation reception unit that receives an operation for ejecting the liquid from the second nozzle 16. It may also include a second operation reception unit that accepts operations.

Further, for example, the liquid ejecting device 10a may include an operation receiving unit that receives an operation by the user 1 to set the generation period and speed of the first airflow. Further, for example, the liquid ejecting device 10a may include an operation receiving unit that receives an operation by the user 1 to set the generation period and speed of the second airflow.

Further, for example, the liquid ejection device 10a may have a configuration in which the second liquid is not ejected from the second nozzle 16.

As described above, in the liquid ejection device 10a, by generating the second airflow, the first liquid can be more accurately ejected to the predetermined region 5 within the nasal cavity 2. Further, in the liquid ejection device 10a, by ejecting the second liquid from the second nozzle 16, the second liquid can be ejected more accurately to a predetermined region 7 within the nasal cavity 2.

The liquid ejection device 10a according to the second embodiment has been described above.

In the liquid ejection device 10a according to the present embodiment, the first nozzle 14 is inserted into one nasal cavity 3 and sucks air to generate a second airflow flowing from the other nasal cavity 4 to one nasal cavity 3. generate.

According to this aspect, the second airflow flowing from the other nasal cavity 4 to one nasal cavity 3 can be generated, so that the first liquid discharged from the first nozzle 14 is transferred to the nasal cavity 2 by the second airflow. can be kept inside. Therefore, the first liquid can be more accurately discharged to the predetermined site 5 within the nasal cavity 2.

Furthermore, in the liquid ejection device 10a according to the present embodiment, the second nozzle 16 ejects the second liquid while being inserted into the other nasal cavity 4.

According to this aspect, since the second liquid can be discharged from the second nozzle 16 inserted into the other nasal cavity 4, the first liquid can be discharged to the predetermined region 5 in the nasal cavity 2. Even in difficult cases, the second liquid can be ejected to the predetermined region 5, and the second liquid can be ejected more accurately to the predetermined region 5 in the nasal cavity 2.

(Third embodiment)
FIG. 8 is a schematic diagram showing a liquid ejecting device 10b according to the third embodiment. In addition, in FIG. 8, the main body part 12, the 1st nozzle 14, and the 2nd nozzle 16 are shown in cross section.

The liquid ejection device 10b generates at least one of the first airflow and the second airflow based on the measurement results of the brain wave measurement unit 54 (see FIG. 13) that measures the brain waves of the user 1 who uses the liquid ejection device 10b. The main difference from the liquid ejecting device 10a is that the liquid ejecting device 10a controls the liquid ejecting device 10a. Below, the explanation will focus on the differences from the liquid ejecting device 10a.

As shown in FIG. 8, the liquid ejection device 10b further includes an acquisition section 52.

The acquisition unit 52 acquires the measurement results of the brain wave measurement unit 54 that measures the brain waves of the user 1 who uses the liquid ejection device 10b. For example, the acquisition unit 52 is a communication module capable of wireless communication with the electroencephalogram measurement unit 54, and acquires the measurement results of the electroencephalogram measurement unit 54 by performing wireless communication with the electroencephalogram measurement unit 54. Note that, for example, the acquisition unit 52 may acquire the measurement results of the electroencephalogram measurement unit 54 by communicating with the electroencephalogram measurement unit 54 by wire. For example, the electroencephalogram measurement unit 54 is an electroencephalogram sensor.

The airflow control unit 34 controls at least one of the first airflow and the second airflow based on the measurement results of the electroencephalogram measurement unit 54. For example, the closer the liquid ejected into the nasal cavity 2 is attached to the olfactory epithelium, the higher the electroencephalogram level measured by the electroencephalogram measurement unit 54 tends to be. Therefore, when the predetermined region 5 is the olfactory epithelium, that is, when discharging liquid to the olfactory epithelium, the airflow control unit 34 controls the speed of the first airflow, the first at least one of a period for generating the second airflow, a speed of the second airflow, and a period for generating the second airflow. Here, the brain wave level is a potential measured by the brain wave measuring section 54. Specifically, for example, the electroencephalogram measurement unit 54 has an electrode attached to the forehead of the user 1, and the electroencephalogram level is the electric potential measured by the electrode.

FIG. 9 is a flowchart showing an example of the operation of the liquid ejecting device 10b of FIG.

In the following, differences from an example of the operation of the liquid ejecting device 10a will be mainly explained.

As shown in FIG. 9, when the airflow control unit 34 generates the second airflow (step S11), the acquisition unit 52 acquires the measurement results of the electroencephalogram measurement unit 54 (step S21). For example, the measurement result of the electroencephalogram measurement unit 54 includes a value indicating the electroencephalogram level.

When the acquisition unit 52 acquires the measurement results of the electroencephalogram measurement unit 54, the airflow control unit 34 changes the generation period of the second airflow (step S22). For example, the airflow control unit 34 shortens the generation period of the second airflow by 0.1 seconds.

When the airflow control unit 34 changes the generation period of the second airflow, the liquid ejection device 10b performs steps S3 to S21 again. In step S11, which is performed again, the airflow control unit 34 generates the second airflow only for the generation period after changing in step S22. By repeating this, it is possible to obtain brain wave levels for each of a plurality of generation periods.

For example, after acquiring the brain wave level for each of the plurality of generation periods, the liquid ejection device 10b performs the operations from step S1 to step S11 using the generation period for the highest brain wave level among the plurality of generation periods. Thereby, the first liquid can be reliably ejected from the olfactory epithelium, which is the predetermined site 5.

FIG. 10 is a table for explaining an example of the operation of the liquid ejecting device 10b of FIG. 8. FIG. 11 is a first explanatory diagram for explaining an example of the operation of the liquid ejecting device 10b of FIG. 8. As shown in FIG. FIG. 12 is a second explanatory diagram for explaining an example of the operation of the liquid ejecting device 10b of FIG. 8. As shown in FIG.

As shown in FIG. 10, for example, the airflow control unit 34 shortens the generation period of the second airflow by 0.1 seconds, and the acquisition unit 52 acquires the brain wave level when exhaling at the set value. .

As shown in FIG. 11(a), for example, when the second airflow generation period is 0.4 seconds, the first liquid 6 stays in the nasal cavity 2. As shown in FIG. 11(b), the acquisition unit 52 obtains the brain wave level (H1) measured when the first liquid 6 stays at the position shown in FIG. 11(a).

As shown in FIG. 12(a), for example, when the second airflow generation period is 0.3 seconds, the first liquid 6 stays in the nasal cavity 2. As shown in FIG. 12(b), the acquisition unit 52 acquires the brain wave level (H2) measured when the first liquid 6 stays at the position shown in FIG. 12(a).

In this way, by changing the generation period of the second airflow, the position where the first liquid 6 stays changes, and the brain wave level also changes. As mentioned above, it can be estimated that the higher the brain wave level is, the closer the first liquid 6 is to the olfactory epithelium. Estimating the generation period of the second airflow when the brain wave level is obtained as the most suitable generation period for the user 1, and controlling the second airflow so that the second airflow is generated only during the generation period. do.

FIG. 13 is a schematic diagram showing the electroencephalogram measuring section 54 and the like. 13(a) shows the electroencephalogram measurement unit 54 and the like, and FIG. 13(b) shows the electroencephalogram level measured by the electroencephalogram measurement unit 54.

As shown in FIG. 13, for example, when the time when stimulation (smell) is applied to the olfactory nerve is set to 0 milliseconds, it can be seen that the brain wave level increases after about 500 milliseconds. By attaching the first liquid closer to the olfactory epithelium, stronger stimulation can be given to the olfactory nerve, resulting in a higher electroencephalogram level. If you want to eject the first liquid into the olfactory epithelium and the brain wave level is highest when the first airflow generation period is set to 0.3 seconds, then the first airflow generation period should be set to 0.3 seconds. It was found that the first liquid adhered to the position closest to the olfactory epithelium when the setting was set to seconds, and it was found that 0.3 seconds was the optimal value. Remember.

Note that, for example, the liquid ejecting device 10b changes the speed of the first airflow and acquires the brain wave level related to each speed, and the airflow control unit 34 estimates the most suitable speed of the first airflow and changes the speed of the first airflow. The first airflow may be controlled so that the first airflow is generated at the speed. Further, for example, the liquid ejection device 10b changes the generation period of the first airflow and acquires the brain wave level related to each generation period, and the airflow control unit 34 estimates the most suitable generation period of the first airflow. However, the first airflow may be controlled so that the first airflow is generated only during the generation period. Further, for example, the liquid ejection device 10b changes the speed of the second airflow and acquires the brain wave level related to each speed, and the airflow control unit 34 estimates the most suitable speed of the second airflow, and The second airflow may be controlled so that the second airflow is generated at the speed. For example, the airflow control unit 34 controls the airflow so that at least one of the first airflow speed, the first airflow generation period, the second airflow speed, and the second airflow generation period is optimized. Control at least one.

As described above, the liquid ejection device 10b can eject the first liquid more accurately to the olfactory epithelium.

The liquid ejection device 10b according to the third embodiment has been described above.

The liquid ejection device 10b according to the present embodiment uses at least one of the first airflow and the second airflow based on the measurement results of the brain wave measurement unit 54 that measures the brain waves of the user 1 who uses the liquid ejection device 10b. It further includes an airflow control section 34 that controls one side.

According to this aspect, at least one of the first airflow and the second airflow can be controlled based on the measurement result of the electroencephalogram measurement unit 54, and at least one of the first airflow and the second airflow can be controlled. Accordingly, the first liquid can be more accurately discharged to the predetermined site 5 within the nasal cavity 2.

(Other embodiments, etc.)
Although the liquid ejection device according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

In the above embodiment, a case has been described in which the liquid ejected to the user 1 is a medical solution, but the present invention is not limited to this. For example, the liquid discharged to the user 1 may be an aromatic liquid that has a relaxing effect, a stimulating liquid that has an awakening effect, or the like.

Further, each of the above devices may be specifically configured as a computer system including a microprocessor, ROM, RAM, hard disk drive, display unit, keyboard, mouse, and the like. Computer programs are stored in the RAM or hard disk drive. Each device achieves its functions by the microprocessor operating according to a computer program. Here, a computer program is configured by combining a plurality of instruction codes indicating instructions to a computer in order to achieve a predetermined function.

Furthermore, some or all of the components constituting each of the above devices may be composed of one system LSI (Large Scale Integration). A system LSI is a super-multifunctional LSI manufactured by integrating a plurality of components on one chip, and includes, for example, a computer system including a microprocessor, ROM, RAM, and the like. In this case, the ROM stores a computer program. The system LSI achieves its functions by the microprocessor operating according to a computer program.

Furthermore, some or all of the components constituting each of the devices described above may be comprised of an IC card or a single module that is detachable from each device. An IC card or module is a computer system composed of a microprocessor, ROM, RAM, etc. The IC card or module may include the above-mentioned super multifunctional LSI. An IC card or module achieves its functions by a microprocessor operating according to a computer program. This IC card or this module may be tamper resistant.

Further, the present invention may be the method described above. Furthermore, the present invention may be a computer program that implements these methods using a computer, or may be a digital signal formed from the computer program.

Further, the present invention provides a computer-readable non-transitory recording medium for storing the computer program or the digital signal, such as a flexible disk, hard disk, CD-ROM, MO, DVD, DVD-ROM, DVD-RAM, BD ( It may also be recorded on a Blu-ray (registered trademark) Disc, a semiconductor memory, or the like. Further, the above-mentioned digital signals recorded on these non-temporary recording media may be used.

Further, in the present invention, the computer program or the digital signal may be transmitted via a telecommunication line, a wireless or wired communication line, a network typified by the Internet, data broadcasting, or the like.

Further, the present invention may provide a computer system including a microprocessor and a memory, wherein the memory stores the computer program, and the microprocessor operates according to the computer program.

In addition, by recording the program or the digital signal on the non-temporary recording medium and transferring it, or by transferring the program or the digital signal via the network etc., It may be implemented by a system.

Furthermore, the above embodiment and the above modification may be combined.

The liquid ejection device according to the present invention can be applied, for example, as a nasal spray dispenser for ejecting a medicinal solution into a user's nasal cavity.

1 User 2 Nasal cavity 3 One nasal cavity 4 Other nasal cavity 5, 7 Predetermined region 6 First liquid 10, 10a, 10b Liquid ejection device 12 Main body 14 First nozzle 16 Second nozzle 18, 42, 44 Discharge section 20, 46 Suction section 22, 48, 50 Liquid detection section 24 Time measurement section 26 Operation reception section 28 Control section 30 Power supply section 32 Discharge control section 34 Airflow control section 36 Calculation section 38, 40 Channel formation section 52 Acquisition section 54 Brain wave measurement section

Claims (10)

a first nozzle that discharges a first liquid while being inserted into one nasal cavity;
a second nozzle that generates a first airflow flowing from the one nasal cavity to the other nasal cavity by inhaling air while being inserted into the other nasal cavity;
Liquid discharge device. The second nozzle, while inserted into the other nasal cavity, sucks in the first liquid discharged from the first nozzle inserted into the one nasal cavity,
further comprising a liquid detection unit that detects the first liquid sucked into the second nozzle;
The liquid ejection device according to claim 1. The device further includes a time measurement unit that measures the time from when the first nozzle discharges the first liquid until when the liquid detection unit detects the first liquid sucked into the second nozzle. ,
The liquid ejection device according to claim 2. further comprising a calculation unit that calculates a distance by multiplying the speed of the first airflow and the time measured by the time measurement unit;
The liquid ejection device according to claim 3. further comprising an airflow control unit that controls the first airflow based on the distance calculated by the calculation unit;
The liquid ejection device according to claim 4. further comprising a discharge control unit configured to discharge the first liquid from the first nozzle in a state where the first airflow is generated;
The liquid ejection device according to any one of claims 1 to 5. The first nozzle generates a second airflow flowing from the other nasal cavity to the one nasal cavity by inhaling air while being inserted into the one nasal cavity.
The liquid ejection device according to claim 1. The second nozzle discharges the second liquid while being inserted into the other nasal cavity.
The liquid ejection device according to claim 7. further comprising an airflow control unit that controls at least one of the first airflow and the second airflow based on a measurement result of an electroencephalogram measurement unit that measures brain waves of a user using the liquid ejection device;
The liquid ejection device according to claim 7 or 8. a discharging step of discharging a first liquid from a first nozzle inserted into one nasal cavity;
generating a first airflow flowing from the one nasal cavity to the other nasal cavity by inhaling air into a second nozzle inserted into the other nasal cavity;
Liquid dispensing method.

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