JPH0444771A - Liquid filter device - Google Patents

Abstract

PURPOSE:To facilitate priming operation and provide a liquid filter device excellent in operability and safety by providing a gas flow part allowing only the pass of gas between the upper stream side space part of a liquid filtering part and, the internal space of a drip cylinder. CONSTITUTION:When a liquid passing bottle needle 13 and a gas passing bottle needle 15 are stuck to the rubber cock body 11 of a transfusing bag 7, the transfusing agent in the transfusing bag 7 is entered to the upper stream side part 29 of the space part 28 of a liquid filtering part 3 through the liquid passing bottle needle 13. As the space part 28 is laid in a positive pressure by the inflow of the transfusing agent, the air present in the space part 28 is transferred to the transfusing bag 7 through the gas passing bottle needle 15. The transfusing agent entered into the upper stream side part 29 of the liquid filtering part 3 is passed through a liquid filter 27 to remove foreign materials, and then transferred to the lower stream side part 31 of the space part of the liquid filtering part 3. The filtered transfusing agent is dropped into the internal space 39 of a drip cylinder body 35 from the drip hole 33 of a drip cylinder 5. Thus, priming operation can be extremely easily conducted, and the time in which a nurse is restrained by the priming operation becomes less.

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a liquid filtration device, and more specifically, the present invention relates to a liquid filtration device, and more specifically, a liquid filtration device that is equipped with a filter for removing foreign substances and bacteria in a liquid such as an infusion solution, and an integrally equipped drip tube. Regarding the filtration device number. [Prior Art] Conventionally, a liquid filtering device has been disposed in a part of an infusion passage for the purpose of removing foreign substances and bacteria from a medical solution such as an infusion solution. In particular, when performing high-calorie infusion therapy from the central vein, a liquid filtration device using a filtration membrane with an average pore size of usually 0.2 to 0.45 μm is used to remove bacteria, foreign substances, and gas from the drug solution. has been done. Such a liquid filtration device is shown in FIG. In FIG. 6, the chemical liquid passes through the duplex 71 and
It flows from the connector 75 of the liquid filtration device 73, and after bacteria, foreign matter, and gas are removed by the hydrophilic filtration membrane in the liquid filtration device 73, it passes through the dehove 77 and is thrown into the human body! j is done. However, when using this liquid filtration device 73, in order to prevent the air existing in the liquid filtration device 73 from being injected into the human body, it is necessary to prepare the liquid filtration device before use. It is necessary to expel the air inside 73 by using a chemical solution, and (e) perform a brimming operation. For this reason, a nurse or the like should hold the liquid filtration device 73 in the reverse position (up) from the normal usage state as shown in FIG. Passed within 73+! Perform the operation. When the chemical liquid is passed through the liquid filtration device 73 in this way, the liquid filtration device 73 shown in FIG. The upstream side of the liquid filter 73 is filled with the chemical liquid 85, and then the chemical liquid 85 gradually passes through the filtration l1K279 and moves to the upstream side, and the air inside the liquid filter device 73 is discharged to the outside. The time required for this operation depends on the water permeability of the filtration membrane, but
Usually 1 to 3 minutes. Furthermore, the air inside duplex 77 is also exhausted to complete the briming operation.

[After that, as shown in FIG. 8, the end of the duplex 77 is connected to
A drug solution 8 connected to 1 and poured from a container 83 containing an infusion drug.
5 is duplex 7], liquid filtration device 73. tube 77
and being thrown into a human body 90 via an intravenous catheter 81). [Problems to be Solved by the Invention] As mentioned in Section 1.6, when using this type of liquid filtration device, a briming operation is required in advance, but as shown in FIG. During the brimming operation, the person must hold the duplex 77 with their fingers and watch the process of air being discharged from the liquid filtration device 73. Therefore, there is a problem in that a nurse or the like is restrained during this operation, which requires time and effort. The present invention has been made in view of such problems, and it simplifies the briming operation that this divine liquid filtration device had, saves time, and is often used when using conventional liquid filtration devices. The purpose of the present invention is to provide a liquid filtration device that has excellent operability and safety without causing the reduction in the effective filtration membrane area or damage to the filtration membrane due to air remaining in the liquid filtration device. . [Means for Solving the Problems] The present invention for solving the above-mentioned problems includes a liquid filtration part and a drip barrel provided below the liquid filtration part, and the liquid filtration part is located at the upper part. The drip tube has a liquid inlet, a space into which the liquid can flow, and a filter provided at a position to divide the space into an upstream side and a downstream side to remove foreign substances from the liquid; , a drip tube main body formed of an elastic material and having an internal space large enough to allow liquid to drip from the drip port, and a lower end of the drip tube body; and a liquid outlet provided in the liquid filter; and further includes a gas flow portion that only allows gas flow between the upstream space of the liquid filtration portion and the internal space of the drip tube. This is a liquid filtration device with special features. Furthermore, the present invention includes a liquid filtration part and a drip barrel provided below the liquid filtration part, and the liquid filtration part has a liquid inlet located at an upper part and a space into which the liquid can flow. ,
provided at a position that divides the space into an upstream side and a downstream side,
The drip barrel has a filter for removing foreign substances in the liquid, and a deaeration port that communicates the upstream space with outside air through a bacteria-impermeable filter; A drip port that communicates only with the downstream side, a drip tube body formed from an elastic material and having an internal space large enough to allow liquid to drip from the drip port, and a liquid flow provided at the lower end of the drip tube body. and an outlet; further comprising a gas flow section that only allows gas flow between the upstream space of the liquid filtration section and the internal space of the drip tube. It is a device. Note that the gas flow section is a reverse valve that only allows flow from the internal space of the drip tube to the upstream space of the liquid filtration section, in order to prevent liquid from accidentally flowing into the drip tube without being filtered. This is preferable in order to prevent this from happening. [Function] First, the liquid passing bottle needle located at the uppermost end of the liquid filtration section of the liquid filtration device according to the present invention is pierced through the rubber stopper of the container containing the infusion drug. As a result, the infusion solution in the container containing the infusion solution flows into the space of the liquid filtering section via the liquid passage bottle needle. On the other hand, the air existing in the space is forced into the container containing the infusion agent through the gas passage bottle needle, or is diffused into the outside air through the degassing port. Subsequently, the infusion agent in the liquid filtration section is filtered by the liquid filter, and then dripped into the drip tube main body from the drip port of the drip tube, flowing down the liquid stream 80 provided at the lower end of the drip tube, and passing through the tube. It then transfers to the human body. If the amount of air in the drip tube is too large, press the drip tube body from the side with your fingers to crush it with the tube on the human body side closed with a drain. Then, the air inside the drip barrel body passes through the gas flow section, moves to the liquid filtration section, and is further discharged to the outside from the liquid filtration section via the gas passage bottle needle or the degassing port. At this time, the gas flow section only allows gas to flow between the upstream space of the liquid filtration section and the internal space of the drip tube, so when the drip tube body is crushed by pressing it from the side with your finger, Although the air in the drip tube moves to the liquid filtration side, the liquid in the liquid filtration section does not flow down into the drip tube via the gas flow section. After filling the main body of the drip tube with a predetermined amount of infusion agent in this way, when the drain on the body-side tube is opened, the infusion agent begins to flow down, and the air remaining in the body-side tube is pushed out. It is filled with an infusion solution and can be very easily brimmed before use. Furthermore, other uses will be explained. First, the liquid passage I bottle needle located at the end of the liquid filter device is inserted into the rubber stopper of the container containing the infusion agent. At the same time, press the side of the drip tube body with your finger and push it down.
At this time, since the tube on the human body side is not closed with clean, part of the air inside the drip barrel body moves to the tube side, and part moves to the three-way part of the liquid filtration part. On the other hand, the infusion solution in the container containing the infusion solution flows into the space of the liquid filtering section via the liquid passage bottle needle. Furthermore, the infusion fluid that has flowed into the space of the liquid filtration section then flows into the drip tube main body. At this point, when you let go of your fingers that were pressing down on the drip tube body, about half of the inside of the drip tube body will be filled with air. After the infusion tube body is filled with a predetermined amount of infusion agent in this way, the infusion agent begins to flow down, and the air remaining in the tube on the side of the human body is pushed out and filled with the infusion agent, making it extremely convenient. A brimming operation can be performed before use. [Example] Hereinafter, the present invention will be explained in detail based on the illustrated example. A sectional view of a first embodiment of a liquid filtration device according to the present invention is shown in a part of FIG. First, the liquid filtration part Ml is roughly divided into an upper horn liquid filtration part 3 and a drip tube 5 connected to the upper part of the liquid filtration part 3.
It consists of At the top end of the liquid filtration section 3, there is a sharp object that can pierce the rubber stopper 11 provided at the outlet L19 of the infusion bag 7, which houses a high-calorie infusion solution and whose main body is made of soft plastic. A liquid passage bottle needle 13 having a sharp tip is provided as a liquid inlet [U]. Note that in FIG. 1, the upper part of the infusion bag 7 is not shown. Furthermore, the bottle needle 1 for gas passage is integrated with the bottle needle 13 for liquid passage.
5 are attached. Here, the inner diameter of the liquid passage bottle needle 13 is set larger than the inner diameter of the gas passage layer #i5. Note that if the main body of the infusion bag 7 is made of flexible soft plastic, the gas passage bottle needle 15 is not necessarily necessary, since the infusion bag 7 will be deformed by atmospheric pressure as the infusion agent υ1 comes out. . These two bottle needles are made of injection molded polypropylene, etc.
It is integrally molded with the soft cap portion 17 formed by the soft cap portion 17. Further, the liquid passage bottle needle 13 has a hole diameter of 1,0 to
A 4.0 mm through hole I9 is drilled at 11, and the through hole 1
The infusion agent in the M solution bag 7 flows through the M solution bag 9. - force, the gas passage bottle needle 15 has a hole diameter of 0.5 to 2
．． A 0 mm through hole 21 is bored through which the air in the liquid filtering section 3 flows into the infusion bag 7. The cylindrical part 23 of the liquid filtering part 3 is manufactured by injection molding polyvinyl chloride or propylene-a-olefin copolymer, and is soft and transparent. Then, the hard gap portion 17 is brought into contact with the tip opening 25 of the cylindrical portion 23, and in the curved tip opening L1 portion 25, the transducer (not shown) of the superlinear wave welder is actuated to By performing sonic fusion, the two parts are joined together. In the cylindrical part 23 of the liquid filtration part 3, a liquid filter 27 with an average pore diameter o of 22 μm for removing substances in the liquid is disposed. 28 is divided into an upstream portion 29 and a downstream portion 31. As the membrane of the liquid filter 27, an acetic acid cell "1-su,
A sterilizing filter made of a conventionally known hydrophilic material or a material treated to be hydrophilic, such as polyfluorinated vinyl phosphor, can be used. 4.3. The average pore diameter of the liquid filter 27 varies depending on the type of foreign matter to be removed, but is usually between 02 and 04.
It is 5 μm. The liquid noirter 27 is a cylindrical or polygonal columnar molded product made of polyvinyl chloride, bolyb [1 pyrene, ABS resin, etc.] and has a mesh shape or a large number of grooves, and a filter membrane is attached to the molded product. Manufactured by fixing using heat, ultrasonic waves, or high frequency waves. The liquid filter 27 preferably has a cylindrical shape along the cylindrical portion 23 as shown in FIG. On the other hand, the drip barrel 5 is located at the downstream portion 31 of the liquid filtering section 3
A drip port 33 that communicates only with the drip tube main body 35, which is formed integrally with the cylindrical part 23 of the liquid filtration part 3 and is soft, transparent, and elastic, and a drip tube main body 35 that is formed at the lower end of the drip tube main body. It consists of a liquid outlet 37 provided. Note that one end of a tube 38 is connected to the liquid outlet 37, and the other end of the tube 38 is connected to the human body. Note that the tube 38 has a roller clamp 40
is attached. An internal space 39 is formed within the drip barrel main body 35 and is large enough to allow liquid to flow down from the drip port 33 . The drip barrel main body 35 is made of an elastic material as described above, and after being pressed and crushed with a finger, it returns to its original shape when the finger is released. Furthermore, at the boundary between the liquid filtration part 3 and the drip tube 5,
A gas flow portion 41 is provided that allows gas to flow only between the upstream portion 29 of the space of the liquid filtration portion 3 and the internal space 39 of the drip tube. FIG. 2(a) is an enlarged view of the internal portion indicated by the dotted line in FIG. 1, and shows an example of the gas flow section 41. FIG. That is, the gas flow section 41 connects the liquid filtration section 3 and the drip tube 5.
The valve body 45 is made of an elastic material such as synthetic rubber, and a plastic fixing member 47 is used to fix one end of the valve body 45 to the boundary area. has been done. The valve body 45 is normally positioned to cover the entire surface of the gas communication port 43, as shown in FIG. 2(a), and closes the gas communication port 43. On the other hand, when the internal space 39 of the drip tube 5 becomes positive pressure by pressing the drip tube main body 35 with a finger, the valve body 45 is pushed up by air and uses the point fixed by the fixing member 47 as a fulcrum. , the upstream portion 29 of the liquid filtration section 3 is bent in the direction, and the gas flow port 43 is bent as shown in FIG. 2(b).
is opened, and the positive pressure bone air in the internal space 39 of the drip tube 5 is discharged and transferred to the upstream portion 29 of the liquid filtration section 3. In this way, the valve body 45 acts as a check valve, and only allows gas to flow from the internal space 39 of the drip barrel 5 to the upstream portion 29 of the liquid filter section 3. FIGS. 3(a) and 3(b) show a modification of the gas flow section. That is, in FIG. 3(a), the valve body 45 has an umbrella shape, and is made of an elastic material such as synthetic rubber, as in the case of FIG. The umbrella portion 53 of the umbrella-shaped valve body 45 is fitted in and closes the gas flow port 43. Here, as described above, when the internal space 39 of the drip tube 5 becomes a positive pressure, the umbrella part 53 of the valve body 45 is pushed up by air as shown in FIG. The portion 3 is deflected in the direction of the upstream portion 29, the gas flow port 43 is opened, and the air in the positive pressure bone in the internal space 39 of the drip WI5 is discharged and transferred to the upstream portion 29 of the liquid material filtration portion 3. In the embodiment shown in FIG. 3 as well, the valve body 45 functions as a check valve and only allows gas to flow from the internal space 39 of the drip tube 5 to the upstream space 29 of the liquid filtering section 3. The valve body 45 can be fixed to the boundary between the liquid filter section 3 and the drip tube 5 by methods such as ultrasonic welding, solvent adhesion, high frequency welding, or fitting. Hereinafter, the usage of the first embodiment of the liquid filtration device according to the present invention will be explained with reference to FIG. First, the liquid passage bottle needle 13 and gas passage bottle needle 15 located at the top end of the liquid filtration part 3 of the liquid filtration device 1 are inserted into the rubber stopper 11 provided in the discharge hole 9 of the infusion bag 7. F between the tips of the liquid passage bottle needle 13 and the gas passage bottle needle 15
] is located in the drug solution storage section 8 in the infusion bag 7. As shown in FIG. 1, the liquid outlet 3 of the liquid filtration device 1
7 is a tube 3 made of soft polyvinyl chloride, etc.
Although not shown, the other end of the tube 38 is connected to the human body via a separately connected intravenous indwelling catheter. A clamp 40, such as a so-called roller clamp, is attached to the tube 38 to elastically deform the duplex 38 to change the diameter of the liquid flow path within the tube 38, thereby regulating the flow rate. During the operation of piercing the bottle needle, the tube 38 is
Closed by 0. In this way, when the liquid passage bottle needle 13 and the gas passage bottle needle 15 are pierced through the rubber stopper 11 of the infusion bag 7, the infusion agent in the infusion bag 7 is passed through the liquid passage bottle needle 13. It flows into the upstream portion 29 of the space 28 of the liquid filtration section 3 . On the other hand, since the inside of the space 28 becomes positive pressure due to the inflow of the infusion agent ifj, the air present in the space 28 moves into the infusion bag 7 via the gas passage bottle needle 15. As mentioned above, the liquid filtration device 1-13 has a pore size of 1 and O-4.
,0mm through hole J9, -force, bottle needle 1 for gas passage
5 has a through hole 21 with a hole diameter of 0.5 to 2.0 Il1 m, and the through hole 21 has a smaller hole diameter than the through hole J9, so
The infusion solution flows through the through hole 9, which has a partial serration, but does not flow through the through hole 21, which has a small hole diameter, due to surface tension. The air present in the side portion 29 can pass through the through hole 21, and since the upper and downstream portions 29 are under positive pressure, the air can flow through the infusion bag 7.
You will be pushed inside. Subsequently, the infusion agent that has flowed into the upstream section 29 of the liquid filtration section 3 passes through the liquid filter 27 to remove foreign substances and the like, and then moves to the downstream section 31 of the space section of the liquid filtration section 3. . Next, the infusion solution filtered in this way is placed in the drip tube 5.
33 into the internal space 39 of the drip tube main body 35. Note that the air present in the drip tube main body 35 is
It is dangerous if the infusion agent is transferred to the human body via the infusion tube 7, so in order to prevent this, it is necessary to always fill the internal space 39 of the drip barrel body 35 with a predetermined amount of infusion agent. Therefore,
When the filtered infusion medicine starts to drip from drip 1'' 33, press the drip barrel body 35 with your finger in advance and press it.
). Then, the internal space 3 of the drip tube main body 35? The air that exists on the moon has positive pressure. This is because (the cove 38 is blocked by the cleaner 40 and the liquid filter 2 of the liquid filtration section 3
7 is hydrophilic, so air cannot pass through the liquid filter 27 after it has been wetted by the infusion agent. In this way, the internal space 39 of the drip tube main body 35 has a positive pressure, so as shown in FIG. 2(b) or FIG. 3(b),
When the valve body 45 is pressed by the air O,'', the gas flow l111143 is opened, and -. part of the air existing in the internal space 3εj is discharged, and the liquid filtration section 3 1-1 is discharged. The flow moves to the downstream portion 29. The air that has moved to the upstream portion 29 passes through the infusion solution present in the upstream portion 29 through the air passages S+1 and S+1.
5 and moves into the infusion bag 7. Next, dots? @ Crush the cylinder body 35 and release your finger from 1 -4
Then, the drip tube main body 35 returns to its original shape due to the restoring force, and the infusion agent drips from the drip tube [133], and the internal space 39 of the drip tube body 35 is filled with about 44 minutes of air. When the infusion drug By repeating the push button operation, the amount of the infusion solution to be introduced into the drip tube main body 35 can be adjusted.Next, by opening the clamp 40 that was blocking the duplex 38, the amount of the infusion solution can be adjusted. Continuous dripping begins, and as a result,
The air existing in the tube 38 is pushed out by the infusion agent, and the tube 38 is filled with the infusion agent, thereby completing the priming operation before use very easily. Furthermore, FIG. 4 shows a valve body 4 as a modification of the gas flow section.
A modification is shown in which the opening 58 provided at the upper end of the liquid filter 27 is covered with a hydrophobic filter 59 without using the liquid filter 5. This hydrophobic filter 59 has the property of allowing gas to pass through but not allowing liquids such as infusions to pass through. This hydrophobic filter 59 is made of polyethylene. It can be constructed from a sintered body made by powdering polypropylene, nylon, etc., putting it in a mold, and then heating and compressing it to shape it. In addition, instead of the above sintered body, a membrane filter made of polyester resin aggregate coated with polyvinyl chloride can be used.
may also be used. Other materials that can be used for the membrane filter include polytetrafluoroethylene laminated to polyethylene nonwoven fabric, acetate membrane coated with silicone resin, and porous Teflon laminated to polypropylene nonwoven fabric. can. The hydrophobic filter 59 and liquid filter 27 are
They can be integrated by welding them together. The method of using the liquid filtration device using this hydrophobic filter 59 is the same as the method described above. Next, FIG. 5 shows a sectional view of a second embodiment of the liquid filtration device according to the present invention. The second embodiment differs from the first embodiment in that the gas passage bottle needle 15 in the first embodiment is not provided, and instead, a liquid filtering section 3 is provided on the upper part of the soft cap 17.
The point is that a deaeration port 61 is provided that communicates the upstream side portion 29 of the space with outside air. A bacteria-impermeable filter 63 is disposed in the deaeration port 61 to allow air to pass through, but to prevent bacteria in the outside air from entering the liquid filtration device. The bacteria-impermeable filter 63 is made of a porous body having an average pore diameter large enough to prevent bacteria from passing through, and the same material as the hydrophobic filter 59 described above can be used as the material. The method of use of this second embodiment is similar to the first embodiment, except that the air in the upstream portion 29 of the space of the liquid filtration section 3 is not discharged into the infusion bag 7 ( , differs in that it is dissipated into the outside air through the deaeration port 61. In this second embodiment, as in the first embodiment, the brimming operation before use can be performed extremely easily. Effect 1 As described in detail above, the present invention includes a liquid filtration part and a drip tube provided below the liquid filtration part, and the liquid filtration part has a liquid inlet located at an upper part, and a drip tube provided below the liquid filtration part. The drip tube has a space into which the liquid can flow, and a filter that is provided at a position that divides the space into an upstream side and a downstream side to remove foreign substances from the liquid. A drip port that communicates only with the downstream side, a drip tube body formed from an elastic material and having an internal space large enough to allow liquid to drip from the drip port, and a liquid flow provided at the lower end of the drip tube body. A liquid filtration device, further comprising: a gas flow portion that only allows gas flow between the upstream space of the liquid filtration portion and the internal space of the drip tube. Furthermore, the present invention includes a liquid filtration part and a connected drip tube provided below the liquid filtration part, and the liquid filtration part has a liquid inlet located at an upper part, and a liquid inflow port. a filter that is provided at a position that divides the space into an upstream side and a downstream side to remove foreign substances in the liquid; and a bacteria-impermeable filter that connects the upstream space and the outside air. and a deaeration port that communicates through the infusion.
a drip port that communicates only with the downstream side of the liquid filtration section; a drip tube main body formed of an elastic material and having an internal space large enough to allow liquid to drip from the drip port; and a liquid outlet provided therein; further comprising a gas flow section that allows only C gas to flow between the upstream space of the liquid filtration section and the internal space of the drip tube. This is a liquid filtration device. Therefore, according to the present invention, it is possible to extremely easily perform the briming operation of the air discharge tube σ in the liquid flow path, which is performed before using the liquid filtration device 4. It requires less opening. In addition, there are conventional techniques in which the effective filtration membrane area decreases and the filtration membrane is damaged due to insufficient emptying of the liquid filtration device. This has an excellent effect in that it can solve the problems that were previously encountered. Furthermore, according to the present invention, since the liquid filtration part and the drip tube are integrated, the operability is excellent and the safety is also high. Also,
The gas flow section is configured with a check valve that only allows flow from the internal space of the drip tube to the upstream space of the liquid filtration section, thereby preventing unfiltered liquid from accidentally flowing into the drip tube. Therefore, it is possible to obtain the effect of high safety.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram partially including a sectional view of the first embodiment of the liquid filtration device according to the present invention, and FIG. FIG. 2(b) is an enlarged sectional view showing the operating state of the gas flow section shown in FIG. 2(a). FIG. 3(a) is an enlarged sectional view showing the gas flow shown in FIG. FIG. 3(b) is an enlarged sectional view showing an operating state of the gas circulating portion shown in FIG. 3(a); FIG. 4 is a liquid filtration according to the present invention. A sectional view showing a modification of the first aspect of the device; FIG. 5 is a sectional view of the second aspect of the liquid filtration device according to the present invention; FIG. 6 is an explanatory diagram showing a conventional liquid filtration device; FIG. 7 is an explanatory diagram showing an enlarged cross-section of the liquid filtration device shown in FIG. 6 along the line 1-2, and FIG. 8 is a diagram showing the state of use of the conventional liquid filtration device. (Explanation of symbols of main parts) 1...Liquid filtration device 3...Liquid filtration section 5...Drip tube 13...Bottle needle for liquid passage 15...Bottle needle for gas passage 27...・Liquid filter 28...Space 33...Drip port 35...Drip cylinder body 37...Liquid outlet 41...Gas circulation part 45...Check valve 61...Deaeration mouth

Claims (3)

[Claims] (1) A liquid filtration part; and a drip barrel provided below the liquid filtration part; the liquid filtration part includes: a liquid inlet located at an upper part; a space into which the liquid can flow; Provided at a position that divides the space into upstream and downstream sides,
a filter for removing foreign matter in the liquid; the drip tube has a drip port that communicates only with the downstream side of the liquid filtration section; and an internal space large enough to allow the liquid to drip from the drip port. and a liquid outflow port provided at the lower end of the drip tube main body; and further, an upstream space of the liquid filtration section and an interior of the drip tube. A liquid filtration device comprising: a gas flow section that only allows gas flow between the space and the space. (2) A liquid filtration part; and a drip barrel provided below the liquid filtration part; the liquid filtration part includes: a liquid inlet located at an upper part; a space into which the liquid can flow; Provided at a position that divides the space into upstream and downstream sides,
The drip barrel includes: a filter for removing foreign substances in the liquid; and a deaeration port that communicates the upstream space with outside air via a bacteria-impermeable filter; a drip port that communicates only with the downstream side of the drip tube, a drip tube main body formed of an elastic material and having an internal space large enough to allow liquid to drip from the drip port, and a liquid provided at the lower end of the drip tube main body. an outlet, and further comprising a gas flow section that only allows gas flow between the upstream space of the liquid filtration section and the internal space of the drip tube. Liquid filtration equipment. (3) The liquid filtration device according to claim 1 or 2, wherein the gas flow section includes a check valve that only allows flow from the internal space of the drip tube to the upstream space of the liquid filtration section.