CN216022369U

CN216022369U - Drainage device

Info

Publication number: CN216022369U
Application number: CN202122251166.9U
Authority: CN
Inventors: 不公告发明人
Original assignee: Suzhou Liding Biotechnology Co ltd
Current assignee: Suzhou Liding Biotechnology Co ltd
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2022-03-15
Anticipated expiration: 2031-09-16

Abstract

The embodiment of the specification discloses a drainage device, which is characterized by comprising a drainage tube, a drainage valve assembly and a drainage bag which are sequentially connected; one end of the drainage tube is inserted into the body cavity of the target die body, and the other end of the drainage tube is connected with the drainage valve component; the drainage valve assembly comprises a shell, a first one-way valve and a second one-way valve, wherein the first one-way valve and the second one-way valve are arranged in the shell; the first one-way valve is used for controlling one-way communication from the drainage tube to the shell, and the second one-way valve is used for controlling one-way communication from the shell to the drainage bag; the second one-way valve divides the inner cavity of the shell into a first cavity and a second cavity, the first one-way valve is arranged in the first cavity, and the second cavity is communicated with the drainage bag. The drainage device in the embodiment of the specification can perform negative pressure drainage by controlling the drainage valve component, is high in drainage efficiency, simple in operation and convenient to carry, has a simple structure and low manufacturing cost, and can effectively prevent drainage from flowing back.

Description

Drainage device

Technical Field

The present description relates to the field of medical devices, in particular to a drainage device.

Background

In clinical treatment, when problems such as pneumatosis and effusion occur in a body cavity (such as a chest cavity or an abdominal cavity) of a patient, for example, in the case that the patient has spontaneous pneumothorax, blood/pneumothorax caused by trauma, effusion occurs in the chest cavity or the abdominal cavity of the patient or the patient is subjected to thoracoabdominal cavity operation, if the pneumatosis and the effusion are drained out of the body of the patient in time without using a drainage device, pneumothorax or the body cavity infection is caused, and the irretrievable consequence is more likely to be caused. However, the drainage device used in clinical practice at present also has one or more problems of complex structure, high production cost, low drainage efficiency, inconvenience for patient operation, inconvenience for carrying, and the like.

Accordingly, it is desirable to provide a drainage device that is simple in construction, inexpensive to manufacture, efficient in drainage, easy for the patient to operate, and portable.

SUMMERY OF THE UTILITY MODEL

One of the embodiments of the present specification provides a drainage device, which includes a drainage tube, a drainage valve assembly and a drainage bag connected in sequence; one end of the drainage tube is used for being inserted into a body cavity of a target die body, and the other end of the drainage tube is connected with the drainage valve assembly; the drainage valve assembly comprises a shell, a first one-way valve and a second one-way valve, wherein the first one-way valve and the second one-way valve are arranged in the shell; the first one-way valve is used for controlling one-way communication between the drainage tube and the shell, and the second one-way valve is used for controlling one-way communication between the shell and the drainage bag; the second one-way valve divides the inner cavity of the shell into a first cavity and a second cavity, the first one-way valve is arranged in the first cavity, and the second cavity is communicated with the drainage bag.

In some embodiments, the first one-way valve is for enabling non-communication between the first chamber and the drain tube and the second one-way valve is for enabling one-way communication from the first chamber to the second chamber when the pressure within the first chamber is greater than the pressure within the drain tube and the second chamber; when the pressure in the first cavity is equal to the pressure in the drainage tube and the second cavity, the first one-way valve is used for realizing the non-communication between the first cavity and the drainage tube, and the second one-way valve is used for realizing the non-communication between the first cavity and the second cavity; when the pressure in the first cavity is lower than the pressure in the drainage tube and the second cavity, the first one-way valve is used for realizing one-way communication from the drainage tube to the first cavity, and the second one-way valve is used for realizing non-communication between the first cavity and the second cavity.

In some embodiments, the housing has a squeezed state and a recovered state, the volume of space of the first cavity when the housing is in the squeezed state being less than the volume of space of the first cavity when the housing is in the recovered state; when the housing is transformed from a recovery state to a compression state, the pressure in the first chamber is increased; the pressure within the first chamber decreases when the housing transitions from the squeezed state to the restored state.

In some embodiments, the housing is made of an elastic material.

In some embodiments, the connection between the drain tube and the drain valve assembly, and between the drain valve assembly and the drain bag is via luer fittings.

In some embodiments, the drainage valve assembly comprises an inlet channel and an outlet channel disposed on the housing, the inlet channel being in communication with the drainage tube; the liquid outlet channel is communicated with the drainage bag.

In some embodiments, the housing comprises an upper shell, a shell, and a lower shell; the upper shell, the shell and the lower shell are detachably connected; wherein, the liquid inlet channel is arranged on the upper shell, and the liquid outlet channel is arranged on the lower shell.

In some embodiments, the first one-way valve is a thin film piece one-way valve; the second one-way valve is a duckbill one-way valve.

In some embodiments, the first check valve is a membrane check valve, the membrane check valve comprises two membrane sheets, a membrane valve port is formed between the two membrane sheets, and the membrane valve port is communicated with one end of the liquid inlet channel far away from the drainage tube; when the pressure in the first cavity is greater than or equal to the pressure in the drainage tube, the two thin film sheets are closed to realize the non-communication between the first cavity and the drainage tube; when the pressure in the first cavity is lower than the pressure in the drainage tube, the two thin film sheets are relatively opened so as to realize the one-way communication between the drainage tube and the first cavity.

In some embodiments, the second one-way valve is a duckbill one-way valve comprising a duckbill valve port, a mounting plate, and a duckbill structure; the edge of the mounting plate is fixedly connected with the inner wall of the shell, the mounting plate divides the inner cavity of the shell into a first cavity and a second cavity, the duckbill valve port is positioned in the first cavity, the duckbill structure is positioned in the second cavity, and the inner cavity of the duckbill valve port is communicated with the gap on the duckbill structure; when the pressure in the first cavity is smaller than or equal to the pressure in the second cavity, the gap on the duckbill structure is closed, so that the first cavity is not communicated with the second cavity; when the pressure in the first cavity is higher than the pressure in the second cavity, the gap in the duckbill structure is opened, so that the one-way communication between the first cavity and the second cavity is realized.

In some embodiments, the drainage tube is provided with a first flushing port, and the upper portion of the housing is provided with a second flushing port.

In some embodiments, a fixing structure is arranged on the drainage bag, and the fixing structure is used for fixing the drainage bag on the target body model.

In some embodiments, the drainage bag is provided with a vent hole and/or a drain hole.

In some embodiments, the drainage device is used for thoracic or abdominal drainage.

Drawings

The present description will be further explained by way of exemplary embodiments, which will be described in detail by way of the accompanying drawings. These embodiments are not intended to be limiting, and in these embodiments like numerals are used to indicate like structures, wherein:

FIG. 1 is a schematic view of a drainage device according to some embodiments herein;

FIG. 2 is a schematic structural view of a diverter valve assembly according to some embodiments herein;

FIG. 3 is a schematic diagram of a configuration of a thin film patch check valve according to some embodiments herein;

figure 4 is a schematic diagram of a duckbill check valve according to some embodiments herein;

figure 5 is a schematic diagram of a duckbill check valve according to some embodiments described herein.

Reference numerals: 100 is a drainage device; 110 is a drainage tube; 111 is a first flushing port; 120 is a bleed valve assembly; 121 is a shell; 1211 is a first cavity; 1212 is a second cavity; 1213 is a second flushing port; 1214 is an upper shell; 1215 is a shell; 1216 is a lower case; 122 is a first one-way valve; 122a, 122b are thin film pieces; 122c is a membrane valve port; 123 is a second one-way valve; 1231 is a duckbill valve port; 1232 is a mounting plate; 1233 is in duckbill structure; 12331 is a slit; 124 is a liquid inlet channel; 125 is a liquid outlet channel; 130 is a drainage bag.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only examples or embodiments of the present description, and that for a person skilled in the art, the present description can also be applied to other similar scenarios on the basis of these drawings without inventive effort. Unless otherwise apparent from the context, or otherwise indicated, like reference numbers in the figures refer to the same structure or operation.

It should be understood that "system", "apparatus", "unit" and/or "module" as used herein is a method for distinguishing different components, elements, parts, portions or assemblies at different levels. However, other words may be substituted by other expressions if they accomplish the same purpose.

As used in this specification and the appended claims, the terms "a," "an," "the," and/or "the" are not intended to be inclusive in the singular, but rather are intended to be inclusive in the plural, unless the context clearly dictates otherwise. In general, the terms "comprises" and "comprising" merely indicate that steps and elements are included which are explicitly identified, that the steps and elements do not form an exclusive list, and that a method or apparatus may include other steps or elements.

The drainage device is used as a medical device for conducting drainage treatment on a patient, and accumulated air or accumulated liquid in a body cavity (such as a chest cavity or an abdominal cavity) of the patient can be drained out of the body of the patient by using the drainage device, so that the problems that the patient has pneumothorax or the body cavity of the patient is infected and the like are prevented.

In some embodiments, the drainage mode of the drainage device is water-sealed drainage. In the case of thoracic drainage, the water-sealed drainage is such that one end (proximal end) of the drainage tube is placed in the thoracic cavity and the other end (distal end) is connected to a water-sealed bottle located lower than the thoracic cavity. A part of liquid (for example, physiological saline) is placed in the water-sealed bottle in advance, and the liquid and the gas accumulated in the thoracic cavity can be discharged due to the principle of gravity and the action of breathing movement. Meanwhile, the outlet of the far-end drainage tube is below the liquid level in the water-sealed bottle, so that the thoracic cavity can be sealed, and the situation that air or liquid in the water-sealed bottle enters the thoracic cavity to cause open pneumothorax or infection when the thoracic cavity recovers negative pressure is avoided. However, there are more limitations to water-sealed drainage. For example, the bottle needs to be kept upright, and if the bottle is toppled, the outlet at the distal end of the drainage end is no longer below the liquid level in the bottle, and the thoracic cavity is no longer sealed, so that the pneumothorax is opened, or infection is caused. In addition, if the water-sealed bottle is placed too high, the liquid in the water-sealed bottle is easy to be sucked into the thoracic cavity by a patient during deep inhalation, and infection is caused. Therefore, the water-sealed bottle is limited in placement mode and placement position, and is not beneficial to carrying and walking of a patient when the patient goes to bed, and is not beneficial to rehabilitation of the patient. And the self weight of the water-sealed bottle and the weight of the physiological saline in the bottle are larger, so that the carrying and the walking of the patient are not facilitated. In addition, the water-sealed bottle needs to be replaced frequently, and the excessive weight of the water-sealed bottle also causes certain difficulty in replacing the water-sealed bottle. For another example, in some cases, during the water-sealed drainage, the patient needs to take a deep breath or cough with strength to effectively discharge the gas and/or liquid accumulated in the thoracic cavity, and for some patients with weak post-operation body, the patient cannot take the deep breath or cough with strength, so that the drainage cannot be completed.

In some embodiments, the drainage mode of the drainage device is dry sealed drainage. In some embodiments, dry sealed drainage is accomplished by creating negative pressure with a negative pressure device (e.g., a suction pump) to draw fluids or gases accumulated in the thoracic or abdominal cavity into a drainage bag. However, since the structure of the negative pressure device is generally complicated, the manufacturing process is difficult, the cost is high, and the manufacturing difficulty and the production cost of the drainage device are increased.

The embodiment of the specification provides a drainage device, and the drainage device comprises a drainage tube, a drainage valve assembly and a drainage bag which are connected in sequence. Wherein one end of the drainage tube is used for insertion into a body cavity (e.g., the thoracic or abdominal cavity) of a patient, and the other end of the drainage tube is connected with the drainage valve assembly. The drainage valve assembly comprises a shell, a first one-way valve and a second one-way valve, wherein the first one-way valve and the second one-way valve are arranged in the shell, the first one-way valve is used for controlling one-way communication from the drainage tube to the shell, the second one-way valve is used for controlling one-way communication from the shell to the drainage bag, the second one-way valve can separate an inner cavity of the shell into a first cavity and a second cavity, the first one-way valve is arranged in the first cavity, and the second cavity is communicated with the drainage bag. The drainage device in the embodiment of the present specification opens the first one-way valve by making the pressure in the first cavity smaller than the pressure in the drainage tube (for example, squeezing the shell and then releasing the shell to generate negative pressure in the first cavity), so as to communicate the drainage tube with the first cavity, and under the action of the negative pressure and/or the self gravity, the effusion or pneumatosis (collectively referred to as drainage) in the chest or abdominal cavity of the patient is drained into the first cavity, and then by making the pressure in the first cavity larger than the pressure in the second cavity (for example, squeezing the shell again) and/or under the action of the gravity of the drainage in the first cavity, the second one-way valve is opened to communicate the first cavity with the second cavity, and the second cavity is communicated with the drainage bag, so that the drainage in the first cavity can be squeezed or enter the second cavity under the action of the self gravity, then enters into the drainage bag, thereby completing the whole drainage process. In the drainage process, no matter how the pressure in the first cavity changes, the first one-way valve and the second one-way valve cannot be in an open state at the same time, so that the drainage object in the drainage bag can be effectively prevented from flowing back into the chest or the abdominal cavity to cause infection (effusion flows back into the chest or the abdominal cavity) or open pneumothorax (pneumatosis flows back into the chest).

In addition, the drainage device in the embodiment of the specification is dry-sealed drainage, adopts the drainage bag to store drainage materials, is convenient for folding and folding the drainage bag, is not limited in position in the drainage process, has good portability, and is particularly suitable for battlefield medical treatment or emergency scenes besides being used in clinical medical treatment. And drainage device in this specification embodiment produces the negative pressure through drainage valve module and realizes the negative pressure drainage, compares with traditional negative pressure device, and drainage valve module's simple structure, manufacturing cost is lower to do benefit to patient's operation, for example, only need the patient to carry out repeated extrusion and loosen just can be fast effectively with hydrops or pneumatosis drainage in patient's thorax or abdominal cavity to the drainage bag, accomplish the drainage.

It should be noted that the drainage device in the embodiments of the present disclosure may be used for thoracic or abdominal drainage, for example, puncture drainage treatment such as pneumothorax, hemothorax, hemopneumothorax, pleural effusion, thoracic surgery, peritoneal abscess, peritoneal effusion, ascites, and the like. The drainage may include air, blood, pus, water, etc. that accumulates in the chest or abdominal cavity. In some embodiments, the drainage device of embodiments of the present disclosure may also be used for drainage of the cerebral cavity, pelvic drainage, or catheterization. Drainage can include blood or fluid accumulation in the cerebral or pelvic cavities and urine accumulation in the bladder. The description will mainly be given by taking thoracic or abdominal drainage as an example.

The drainage device in the embodiments of the present specification will be described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a drainage device according to some embodiments of the present disclosure.

As shown in FIG. 1, the drainage device 100 includes a drainage tube 110, a drainage valve assembly 120 and a drainage bag 130 connected in sequence, wherein one end of the drainage tube 110 is used for being inserted into a body cavity of a target phantom, and the other end of the drainage tube 110 is connected with the drainage valve assembly 120. The drain valve assembly 120 may include a housing 121 and first and second one-

way valves

122, 123 disposed within the housing 121, the first one-way valve 122 may be used to control one-way communication from the drain tube 110 to the housing 121, and the second one-way valve 123 may be used to control one-way communication from the housing 121 to the drain bag 130. And the second one-way valve 123 divides the inner cavity of the housing into a first cavity 1211 and a second cavity 1212, the first one-way valve 122 may be disposed within the first cavity 1211, and the second cavity 1212 may be in communication with the drainage bag. In some embodiments, the target phantom may refer to a living body requiring drainage therapy, and the body cavity may include the chest cavity, abdominal cavity, brain cavity, pus cavity, bladder, etc. It should be noted that in some parts of the description, the target phantom is also referred to as the patient.

In some embodiments, one end of drain tube 110 may be inserted into a body cavity of a subject phantom through a conventional incision or percutaneous puncture procedure to direct drainage from the body cavity of the subject phantom into the drain tube. In some embodiments, one or more drainage holes (not shown) may be formed in the body of the drainage tube 110 at the end inserted into the body cavity, and drainage in the body cavity may additionally enter the drainage tube 110 through the drainage holes, so as to increase the efficiency of the drainage in the body cavity entering the drainage tube 110. In some embodiments, one or more drainage grooves (not shown) may be further disposed in the inner cavity of the drainage tube 110, and the drainage substance can flow into the first cavity 1211 along the drainage groove after entering the drainage tube 110, so as to ensure that the drainage substance can smoothly flow in the drainage tube 110.

In some embodiments, drain tube 110, drain valve assembly 120, and drain bag 130 may be connected by a luer fitting (not shown). The components of the drainage device 100 are connected through luer connectors, so that the connection is reliable and the sealing performance is good.

In some embodiments, the diameter of drain tube 110 can be selected from between 6F and 40F to meet current clinical treatment. In some embodiments, the tube diameter of drain tube 110 can be selected according to patients of different ages. For example, drains with diameters of 28F, 32F and 36F may be used for adults, while drains with diameters of 16F, 20F and 24F may be used for children.

In some embodiments, the length of drain 110 can be selected according to the actual drainage portion, and for thoracic or abdominal drainage, for example, the length of drain 110 can be between 10cm and 50 cm.

In some embodiments, the material of drain tube 110 may include at least one of polyurethane, polyethylene, polyvinyl chloride, polytetrafluoroethylene, natural or synthetic latex, silicone rubber, and silicone rubber.

In some embodiments, the drainage tube 110 may also be provided with a visualization portion (not shown) on an end that is inserted into the body cavity of the target phantom, which may be used to track the position of the drainage tube 110 within the body cavity of the target phantom. In some embodiments, the developing portion may include a developing ring made of a noble metal or an X-ray developing marking line made of barium sulfate.

In some embodiments, with continued reference to FIG. 1, a first irrigation port 111 may be provided in drain 110 and a second irrigation port 1213 may be provided in an upper portion of housing 121, and the drainage device 100 and the body cavity of the subject mold may be irrigated by injecting an irrigation fluid (e.g., saline) into the first irrigation port 111 and the second irrigation port 1213. By way of example only, during a flushing procedure, an operator may pinch off the portion of the drain between the first flushing port 111 and a body cavity of a target phantom (i.e., the end of the drain 110 inserted into the body cavity of the target phantom), and inject flushing fluid into the second flushing port 1213 to effect flushing of the portion of the drain between the drain valve assemblies 120, and the drain bag 130; and the drainage tube part between the first flushing port 111 and the drainage valve assembly 120 is clamped, and the flushing liquid is injected into the first flushing port 111 to flush the drainage tube and the body cavity of the target die body. In some embodiments, after the body cavity of the target phantom is completely flushed, the flushing fluid may remain in the body cavity, and the flushing fluid may be drained through the drainage device 100. Specifically, the operator may create negative pressure within the first cavity by repeatedly squeezing and releasing the housing 121 of the flow diverter valve assembly 120, which draws irrigation fluid out of the body cavity of the target mold. With regard to how the drainage device 100 drains irrigation fluid out of a body cavity of a target phantom, reference may be made to the description elsewhere in this specification regarding how the drainage device 100 drains fluid to this point.

In some embodiments, luer connectors may be provided on drain tube 110 and housing 121 to serve as first irrigation port 111 and second irrigation port 1213, which may be closed when no irrigation is performed, so as to prevent external bacteria from entering the body cavity of the target phantom through the irrigation ports and causing infection.

By providing the first flushing port 111 on the drainage tube 110 and the second flushing port 1213 on the housing 121, the various components of the drainage device 100 (e.g., the drainage tube 110, the drainage valve assembly 120, and the drainage bag 130) can be flushed without disassembling the drainage device 100, and the problem of infection caused by the disassembly of the drainage device to flush the drainage tube 100 alone to flush external bacteria into the body cavity of the target phantom can be avoided. In addition, when drainage object causes drainage tube 100 to block up when for pus or solution, wash the drainage tube through first washing mouth 111, also enable the drainage tube and keep unobstructed, need not to relapse multisegment extrusion drainage tube after operating personnel pinches the drainage tube and keep the drainage tube unobstructed, labour saving and time saving.

In some embodiments, the drainage bag 130 can be used to buffer drainage. In some embodiments, the drainage bag 130 can be rolled, folded, and easily stored and carried. In some embodiments, a fixing structure (not shown) may be disposed on the drainage bag 130, and the fixing structure may be used to fix the drainage bag 130 on the body of the target phantom, so that the drainage bag 130 is carried with the target phantom during the use of the drainage device 100, so that the target phantom can be moved out of the bed during the drainage process, which is beneficial to the rehabilitation of the target phantom. In some embodiments, the manner in which the securing structure secures the drainage bag 130 to the target body may include at least one of hanging, adhesive, and taping. For example, the securing structure may be a hook for hanging the drainage bag 130 at the waist, chest, etc. of the subject phantom. For another example, the fixing structure may be a hook and loop fastener for attaching the drainage bag 130 to the clothing of the target mold body. As another example, the securing structure may be a strap for securing the drainage bag 130 to an arm, thigh, etc. of the subject mold body.

In some embodiments, a vent hole and/or a drain hole (not shown) may be disposed on the drain bag 130 for draining the drain (e.g., air or liquid) from the drain bag 130. In some embodiments, only the vent holes may be provided on the drainage bag, for example, for drainage treatment of a pneumothorax patient. In some embodiments, only drain holes may be provided on the drainage bag 130, for example, for drainage treatment of a hemothorax patient. In some embodiments, the drainage bag 130 can be provided with an air vent and a liquid vent at the same time, so as to treat the drainage of the patient with hemopneumothorax. In some embodiments, a vent hole may be provided on the upper side of the drain bag 130 (i.e., the side near the drain valve assembly 120) to facilitate air from the drain bag 130 rising up through the vent hole to exit the drain bag 130. In some embodiments, a drain hole may be provided on the lower side of the drain bag 130 (i.e., the side away from the drain valve assembly 120) to facilitate the accumulated fluid in the drain bag 130 to drain out of the drain bag 130 through the drain hole under its own weight. In some embodiments, the drainage bag 130 can be made of a breathable film instead of a vent hole. Specifically, the air permeable film can allow air to permeate to discharge the air in the drainage bag 130, and can prevent the liquid in the drainage bag 130 from flowing out or seeping out, thereby ensuring that the liquid can only be discharged through the liquid discharge hole. In some embodiments, the breathable film may be made of polyethylene, polytetrafluoroethylene, polyethersulfone, or the like.

In some embodiments, the drainage bag 130 can further include a scale mark, and the scale mark can measure the drainage (e.g., blood, pus, etc.) in the drainage bag 130.

In some embodiments, drain tube 110, drain valve assembly 120, and drain bag 130 can all be made of a transparent material so that the color and flow of the drain can be clearly observed by the operator during the draining process.

In some embodiments, during drainage of the drainage device 100, when the drainage is a liquid (e.g., blood, pus, water, etc.), the first one-way valve 122 for controlling one-way communication from the drain tube 110 to the housing 121 and the second one-way valve 123 for controlling one-way communication from the housing 121 to the drainage bag 130 may be achieved by the gravity action of the liquid. Specifically, during drainage (e.g., natural drainage or referred to as gravity drainage), fluid flows from the body cavity of the subject phantom to the drainage valve assembly 120 through the drainage tube 110 under the influence of its own gravity, and the first and second one-

way valves

122 and 123 open under the influence of the gravity of the fluid to achieve one-way communication between the drainage tube 110 to the housing 121 and one-way communication between the housing 121 to the drainage bag 130, respectively.

In some embodiments, the use of first one-way valve 122 to control one-way communication from drain tube 110 to housing 121 and the use of second one-way valve 123 to control one-way communication from housing 121 to drain bag 130 may be accomplished by regulating the pressure within first chamber 1211.

Further, when the pressure within the first chamber 1211 is less than the pressure within the drain tube 110 (or the body cavity of the target phantom) and the second chamber 1212 (e.g., the pressure within the first chamber is less than atmospheric pressure, i.e., negative), the first one-way valve 122 may be operable to enable one-way communication from the drain tube 110 to the first chamber 1211 (i.e., to enable one-way communication from the drain tube 110 to the housing 121), and the second one-way valve 123 may be operable to enable non-communication between the first chamber 1211 and the second chamber 1212, i.e., the first one-way valve 122 is in an open state and the second one-way valve 123 is in a closed state. And in the case that the pressure in the drainage tube 110 is greater than the pressure in the first cavity 1211, that is, when the first cavity 1211 is negative pressure, drainage can be sucked from the body cavity of the target phantom into the housing 121 (the first cavity 1211) through the drainage tube 110 and the first one-way valve 122 under the action of the negative pressure, so that negative pressure drainage is realized. In this embodiment, the pressure within the first chamber 1211 may be less than or equal to-2 cmH₂O (centimeter water column) such that the first check valve 122 is in an open stateIn the open state, the second check valve 123 is in the closed state. In some embodiments, when the target phantom is a pneumothorax or hemothorax patient, the pressure within drain 110 (i.e., the target phantom thorax) is greater than or equal to +2cmH₂O, while the pressure in the first chamber 1211 may be less than +2cmH₂O。

When the pressure in the first chamber 1211 is higher than the pressures in the drainage tube 110 and the second chamber 1212 (for example, the pressure in the first chamber 1211 is higher than the atmospheric pressure), the first one-way valve 122 may be used to realize the non-communication between the first chamber 1211 and the drainage tube, and the second one-way valve 123 may be used to realize the one-way communication between the first chamber 1211 and the second chamber 1212 (i.e., the one-way communication between the housing 121 and the drainage bag 123), that is, the first one-way valve 122 is in the closed state, and the second one-way valve 123 is in the open state, so that the drainage in the first chamber 1211 can flow into the second chamber 1212 through the second one-way valve 123, and because the second chamber 1212 is communicated with the drainage bag 130, the drainage can flow directly into the drainage bag 130 from the second chamber 1212. In this embodiment, the pressure within the first chamber 1211 may be greater than or equal to +2cmH₂O, so that the first check valve 122 is in a closed state and the second check valve 123 is in an open state. In some embodiments, the pressure within drain tube 110 (the body cavity of the target phantom) may be negative to satisfy that the pressure within first chamber 1211 is greater than the pressure within second chamber 1212, wherein the pressure within drain tube 110 may be less than or equal to-2 cmH₂And O. In some embodiments, when the body cavity of the target phantom in communication with drain 110 is the thoracic cavity, forceful aspiration through the target phantom may bring the negative pressure within the thoracic cavity of the target phantom (i.e., drain 110) to-90 mmHg (millimeters of mercury).

In some cases, due to the pressure in the first chamber 1211 being too high relative to the pressure in the drain tube 110 (e.g., the patient performing chest drainage is inhaling with strength) or the pressure in the second chamber 1212 being too high relative to the pressure in the first chamber 1211 (e.g., the higher the negative pressure in the first chamber 1211), the first one-way valve 122 may be caused to achieve one-way communication between the first chamber 1211 and the drain tube 110 or the second one-way valve 123 may be caused to achieve one-way communication between the second chamber 1212 and the first chamber 1211, which may cause drainage to flow back into the body cavity of the target phantom, resulting in a pneumothorax or an infection condition. Therefore, in some embodiments, the reverse pressure difference that the first check valve 122 and the second check valve 123 can withstand can be between 90mmHg and 110mmHg, i.e., the first check valve 122 and the second check valve 123 are still in the closed state under the condition that the pressure in the first cavity 1211 is greater than the pressure in the draft tube 110 or the pressure in the second cavity 1212 is greater than the pressure in the first cavity 1211 by no more than 90mmHg and 110 mmHg.

When the pressure in the first chamber 1211 is equal to the pressure in the draft tube 110 and the second chamber 1212 (e.g., the pressure in the first chamber is equal to the atmospheric pressure), the first check valve 122 may be used to achieve non-communication between the draft tube 110 and the first chamber 1211, and the second check valve 123 may be used to achieve non-communication between the first chamber 1211 and the second chamber 1212, that is, both the first check valve 122 and the second check valve 123 are in the closed state.

In some embodiments, the pressure within the first chamber 1211 may be achieved by adjusting a spatial volume of the first chamber 1211. In some embodiments, adjusting the spatial volume of the first cavity 1211 can be accomplished by squeezing the housing 121.

Further, the housing 121 may be made of an elastic material. In some embodiments, the resilient material may comprise polyurethane, silicone, nylon, or the like. When the shell 121 is pressed, the shell 121 may be deformed to be in a pressed state, and after the shell 121 is released, the shell is deformed to be in a restored state (or referred to as an original state) by an elastic force. The volume of the first cavity 1211 when the casing 121 is in the compressed state is smaller than the volume of the first cavity when the casing 121 is in the recovery state. When the housing 121 is transformed from the recovery state to the compression state, the pressure inside the first chamber 1211 increases (generally higher than atmospheric pressure), being greater than the pressure inside the draft tube 110 and the second chamber 1212; when housing 121 is transitioned from the squeezed state to the recovery state, the pressure within first chamber 1211 decreases (typically below atmospheric pressure, i.e., negative pressure), less than the pressure within draft tube 110 and the second chamber.

Thus, in use of the drainage device 100, negative pressure drainage can be achieved by repeatedly squeezing the release housing 121.

By way of example only, before the drainage device 100 is used, the housing 121 is in the recovery state, when an operator (e.g., the patient himself, a doctor, a nurse, etc.) uses the drainage device 100, the operator squeezes the housing 121, the housing 121 is in the squeezing state, the volume of the first cavity 1211 decreases, the pressure increases and is greater than the pressure in the drainage tube 110 and the second cavity 1212, the first one-way valve 1211 is in the closed state, and the second one-way valve 123 is in the open state (one-way communication between the first cavity 1211 and the second cavity 1212). Then, the operator releases the housing 121, the housing 121 is transformed to the recovery state, the volume of the first cavity 1211 increases, the pressure in the first cavity 1211 decreases (i.e. negative pressure is generated in the first cavity 1211) and is smaller than the pressure in the drainage tube 110 and the second cavity 1212, and the first one-way valve 122 is in the open state (one-way communication from the drainage tube 110 to the first cavity 1211) and the second one-way valve 123 is in the closed state. Under the action of the negative pressure in the first cavity 1211, the drainage object in the body cavity of the target phantom is drained into the first cavity 1121 through the drainage tube 110 through the first one-way valve 122, the operator squeezes the housing 121 again, so that the housing 121 returns to the squeezed state again, the first one-way valve 122 is in the closed state, the second one-way valve 123 is in the open state, the drainage object in the first cavity 1211 can enter the second cavity 1212 through the second one-way valve 123 and then enter the drainage bag 130, and the drainage object in the body cavity of the target phantom can be gradually drained into the drainage bag 130 by repeating the above operations.

In some embodiments, to facilitate compression of the housing 121, the housing 121 may be cylindrical, conical, oval, or circular bellows-shaped in shape. In some embodiments, pressing the housing 121 may be replaced by pressing.

The drainage device 100 in the embodiment of the present specification releases the housing 121 of the drainage valve assembly 120 by repeated squeezing, so that the housing 121 is repeatedly changed between the recovery state and the squeezing state, the pressure in the first cavity 1211 can be increased or decreased relative to the pressure in the drainage tube 110 and the second cavity 1212, the opening or closing of the first one-way valve 122 and the second one-way valve 123 can be controlled, thereby realizing one-way communication or non-communication between the drainage tube 110 and the housing 121 and one-way communication or non-communication between the housing 121 and the drainage bag 130, and when the pressure in the first cavity 1211 is decreased, negative pressure is generated in the first cavity 1211, and under the action of the negative pressure, drainage in the body cavity of the target phantom can be effectively drained into the housing 121, and finally into the drainage bag 130, so as to realize negative pressure drainage. Especially under the drainage thing is the condition that the position of gas or drainage bag 130 is higher than drainage position and can't be applicable to gravity drainage often, drainage device in this specification embodiment has better drainage effect through the negative pressure drainage to easy operation, operating personnel only need extrude repeatedly and loosen casing 121 just can accomplish the drainage. In addition, no matter how the pressure inside the first cavity 1211 changes, the first one-way valve 122 and the second one-way valve 123 cannot be in the open state at the same time, so that the problems of infection or open pneumothorax caused by the backflow of the drainage matter in the drainage bag 130 into the body cavity of the target mold body can be effectively avoided. The description of how the first one-way valve 122 and the second one-way valve 123 control the one-way communication from the drain tube 110 to the housing 121 and the one-way communication from the housing 121 to the drain bag 130 based on the pressure change in the first chamber 1211 can refer to the related description elsewhere in this specification, such as fig. 2, 3, 4, 5 and the related description thereof.

FIG. 2 is a schematic diagram of the construction of a diverter valve assembly according to some embodiments herein.

As shown in fig. 2, the drain valve assembly 120 may include an inlet passage 124 and an outlet passage 125 provided on the housing 121. Wherein, the liquid inlet channel 124 is communicated with the drainage tube; the outlet channel 125 communicates with the drainage bag 130. Further, one end of the inlet channel 124 near the drain tube 110 is communicated with the drain tube 110 through a luer connector, and the outlet channel 125 is communicated with the drain bag 130 through a luer connector, so as to sequentially connect the drain tube 110, the drain valve assembly 120 and the drain bag 130.

The housing 121 may include an upper shell 1214, a shell 1215, and a lower shell 1216. Wherein the inlet channel 124 may be disposed on the upper housing 1214 and the outlet channel 125 may be disposed on the lower housing 1216. In some embodiments, the upper housing 1214, the outer housing 1215, and the lower housing 1216 may be removably coupled, e.g., threaded, snap-fit, etc. In some embodiments, the upper housing 1214 and the housing 1215 may be integrally formed (e.g., by injection molding, 3D printing, etc.) (i.e., the upper housing 1214 and the housing 1215 are in the same housing), and the lower housing 1216 may be removably coupled to the integrally formed upper housing 1214 and housing 1215. In some embodiments, the lower housing 1216 and the housing 1215 may be integrally formed (i.e., the lower housing 1216 and the housing 1215 are in the same housing), and the upper housing 1214 may be removably coupled to the integrally formed upper housing 1216 and housing 1215. Because the first one-way valve 122 and the second one-way valve 123 are located within the housing 121, assembly of the flow directing valve assembly 120 during manufacture of the flow directing device 100 is facilitated by providing a removable connection between the upper housing 1214, the outer housing 1215, and the lower housing 1216. For example only, the upper housing 1214, the outer housing 1215, and the lower housing 1216 may be assembled into the housing 121 after the respective installation of the first and second one-

way valves

122, 123 is completed when the flow drain valve assembly 120 is assembled.

In some embodiments, the first one-way valve 122 and the second one-way valve 123 may be at least one of a duckbill one-way valve, a membrane sheet one-way valve. The duckbill one-way valve and the film sheet one-way valve have simple structures, low manufacturing cost and good one-way conductivity, and can effectively prevent the drainage object from flowing back into the body cavity of the target die body to cause infection or open pneumothorax.

The structure and the operation principle of the flow guide valve assembly 120 will be described in detail in the present specification by taking the first check valve 122 as a membrane check valve and the second check valve 123 as a duckbill check valve, for example, and combining the specific structures of the membrane check valve and the duckbill check valve.

Figure 3 is a schematic diagram of a thin film piece check valve according to some embodiments of the present disclosure. Figures 4 and 5 are schematic structural views of a duckbill check valve according to some embodiments herein.

Referring to fig. 2 and 3, the first check valve 122 is a membrane check valve, the first check valve 122 includes two

membranes

122a and 122b, a membrane port 122c is formed between the membrane 122a and the membrane 122b, the membrane port 122c is communicated with an end of the inlet channel 124 away from the drainage tube 110 (e.g., via a luer), and a drainage substance can enter the first check valve 122 through the membrane port 122 c.

When the pressure in the first cavity 1211 is greater than or equal to the pressure in the drainage tube 110, the thin film piece 122a and the thin film piece 122b are closed, the first one-way valve 122 is in a closed state, and the drainage can not pass through the first one-way valve 122, so that the first cavity 1121 is not communicated with the drainage tube 110. Specifically, when the pressure in the first chamber 1211 is greater than the pressure in the drainage tube 110, the thin film piece 122a and the thin film piece 122b are pressed from the outside to the inside, so that the thin film piece 122a and the thin film piece 122b are closed. When the pressure in the first chamber 1211 is equal to the pressure in the drainage tube 110, the thin film piece 122a and the thin film piece 122b are not pressurized and remain closed. When the drainage backflow occurs, the

thin films

122a and 122b are kept closed by the outside-in pressure caused by the drainage, so that the drainage in the first cavity 1211 can be prevented from flowing back into the body cavity of the target phantom through the first one-way valve 122, and infection or open pneumothorax can be prevented.

When the pressure in the first chamber 1211 is less than the pressure in the drainage tube 110, the membrane piece 122a and the membrane piece 122b are opened, the membrane valve port 122c is communicated with the space where the membrane piece 122a and the membrane piece 122b are opened, the first one-way valve is in an open state, and the drainage can be communicated from the drainage tube 110 to the first chamber 1121 in one way through the first one-way valve 122 (i.e., the space where the membrane valve port 122c and the membrane piece 122a and the membrane piece 122b are opened). Specifically, when the pressure in the first chamber 1211 is less than the pressure in the drainage tube 110 (i.e., negative pressure in the first chamber 1211), the thin membrane 122a and the thin membrane 122b are pressed from the outside to the inside, so that the thin membrane 122a and the thin membrane 122b are relatively opened, and the drainage in the body cavity of the target phantom can be sucked into the first chamber 1211 through the first one-way valve 122 via the drainage tube under the negative pressure.

In some embodiments, when the drainage is liquid, the liquid flows through the first one-way valve 122, and under the gravity of the liquid, the thin film piece 122a and the thin film piece 122b can be opened relatively, so that the first one-way valve 122 is in an opened state.

As shown in fig. 2, 4 and 5, the second check valve 123 may be a duckbill check valve. The second one-way valve 123 includes a duckbill port 1231, a mounting plate 1232, and a duckbill structure 1233. Wherein, the mounting plate 1232 is fixedly connected with the inner wall of the casing 121 (the housing 1214) by gluing, welding, clamping, etc., the mounting plate 1232 separates the inner cavity of the casing 121 into the first cavity 1211 and the second cavity 1212, the duckbill valve port 1231 faces the first cavity 1211, the duckbill structure 1233 is located in the second cavity 1212, and the duckbill structure 1233 is provided with a slit 12331, the slit 12331 is communicated with the duckbill valve port 1231. The second one-way valve 123 may be disposed within the housing 121 by fixedly attaching the mounting plate 1232 to the inner wall of the housing 121 (housing 1214).

When the pressure in the first cavity 1211 is higher than the pressure in the second cavity 1212, the slit 12331 is opened, the duckbill valve port 1231 is communicated with the second cavity 1212 through the slit 12331, and the second check valve 123 is in an open state, so that the one-way communication between the first cavity 1211 and the second cavity 1212 is realized. Specifically, when the pressure in the first cavity 1211 is greater than the pressure in the drainage tube 110, the slit 12331 is opened by the pressure from the inside to the outside, so that the slit 12331 is opened, the duckbill valve port 1231 can communicate with the second cavity 1212 through the slit 12331, the second check valve 123 is in an open state, and the drainage in the first cavity 1211 can enter the second cavity 1212 through the second check valve 123 (the duckbill valve port 1231, the slit 12331) and then enter the drainage bag 130.

In some embodiments, when the drainage is liquid, the liquid flows through the second one-way valve 123, and under the gravity of the liquid, the slit 12331 can also be opened, so that the second one-way valve 123 is in an open state.

When the pressure in the first cavity 1211 is less than or equal to the pressure in the second cavity 1212, the slit 12331 is closed, and the second check valve 123 is in a closed state, so that the first cavity 1211 and the second cavity 1212 are not communicated with each other. Specifically, when the pressure within the first cavity 1211 is less than the pressure within the second cavity 1212, the slit 12331 is closed by the outside-in pressure. While the slit 12331 remains closed when the pressure in the first chamber 1211 equals the pressure in the second chamber 1212. And when the drainage material flows back, the slit 12331 is kept closed by the pressure from outside to inside brought by the drainage material, so that the drainage material in the second cavity 1212 (the drainage bag 130) can be prevented from flowing back into the first cavity 1211 through the second one-way valve 123, and the possibility of flowing back into the body cavity of the target phantom is reduced.

In some embodiments, first one-way valve 122 and second one-way valve 123 may both be duckbill one-way valves. In some embodiments, the first one-way valve 122 and the second one-way valve 123 may both be thin film sheet one-way valves. In some embodiments, the first one-way valve 122 may be a duckbill one-way valve and the second one-way valve may be a thin film piece one-way valve. The first one-way valve 122 and the second one-way valve 123 are installed while maintaining the same orientation of the ports (membrane port 122c and/or duckbill port 1231).

The beneficial effects that may be brought by the embodiments of the present description include, but are not limited to: (1) the drainage device in the embodiment of the specification releases the shell of the drainage valve assembly through repeated extrusion, so that negative pressure is generated in the first cavity, and drainage materials are sucked out of the body cavity of a patient under the action of the negative pressure, so that negative pressure drainage is realized, the drainage efficiency is high, the operation is simple, the backflow of the drainage materials can be effectively prevented, and the drainage valve assembly is simple in structure and low in manufacturing cost; (2) in the drainage device in the embodiment of the specification, the drainage tube and the shell of the drainage valve assembly are provided with the flushing ports, so that the drainage device and the body cavity of a patient can be conveniently flushed, and the flushing operation process is simple and sanitary; (3) the drainage device in the embodiment of the specification adopts the drainage bag, and the drainage bag is provided with the fixing structure, so that the drainage device is convenient for a patient to carry, the patient can get out of bed to walk in the drainage process, and the recovery of the patient is facilitated.

It is to be noted that different embodiments may produce different advantages, and in different embodiments, any one or combination of the above advantages may be produced, or any other advantages may be obtained.

Having thus described the basic concept, it will be apparent to those skilled in the art that the foregoing detailed disclosure is to be regarded as illustrative only and not as limiting the present specification. Various modifications, improvements and adaptations to the present description may occur to those skilled in the art, although not explicitly described herein. Such modifications, improvements and adaptations are proposed in the present specification and thus fall within the spirit and scope of the exemplary embodiments of the present specification.

Also, the description uses specific words to describe embodiments of the description. Reference throughout this specification to "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with at least one embodiment of the specification is included. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, some features, structures, or characteristics of one or more embodiments of the specification may be combined as appropriate.

Additionally, the order in which the elements and sequences of the process are recited in the specification, the use of alphanumeric characters, or other designations, is not intended to limit the order in which the processes and methods of the specification occur, unless otherwise specified in the claims. While various presently contemplated embodiments have been discussed in the foregoing disclosure by way of example, it should be understood that such detail is solely for that purpose and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements that are within the spirit and scope of the embodiments herein. For example, although the system components described above may be implemented by hardware devices, they may also be implemented by software-only solutions, such as installing the described system on an existing server or mobile device.

Similarly, it should be noted that in the foregoing description of embodiments of the specification, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of one or more of the embodiments. This method of disclosure, however, is not intended to imply that more features than are expressly recited in a claim. Indeed, the embodiments may be characterized as having less than all of the features of a single embodiment disclosed above.

Numerals describing the number of components, attributes, etc. are used in some embodiments, it being understood that such numerals used in the description of the embodiments are modified in some instances by the use of the modifier "about", "approximately" or "substantially". Unless otherwise indicated, "about", "approximately" or "substantially" indicates that the number allows a variation of ± 20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximations that may vary depending upon the desired properties of the individual embodiments. In some embodiments, the numerical parameter should take into account the specified significant digits and employ a general digit preserving approach. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the range are approximations, in the specific examples, such numerical values are set forth as precisely as possible within the scope of the application.

For each patent, patent application publication, and other material, such as articles, books, specifications, publications, documents, etc., cited in this specification, the entire contents of each are hereby incorporated by reference into this specification. Except where the application history document does not conform to or conflict with the contents of the present specification, it is to be understood that the application history document, as used herein in the present specification or appended claims, is intended to define the broadest scope of the present specification (whether presently or later in the specification) rather than the broadest scope of the present specification. It is to be understood that the descriptions, definitions and/or uses of terms in the accompanying materials of this specification shall control if they are inconsistent or contrary to the descriptions and/or uses of terms in this specification.

Finally, it should be understood that the embodiments described herein are merely illustrative of the principles of the embodiments of the present disclosure. Other variations are also possible within the scope of the present description. Thus, by way of example, and not limitation, alternative configurations of the embodiments of the specification can be considered consistent with the teachings of the specification. Accordingly, the embodiments of the present description are not limited to only those embodiments explicitly described and depicted herein.

Claims

1. A drainage device is characterized by comprising a drainage tube, a drainage valve component and a drainage bag which are connected in sequence; one end of the drainage tube is used for being inserted into a body cavity of a target die body, and the other end of the drainage tube is connected with the drainage valve assembly;

the drainage valve assembly comprises a shell, a first one-way valve and a second one-way valve, wherein the first one-way valve and the second one-way valve are arranged in the shell; the first one-way valve is used for controlling one-way communication between the drainage tube and the shell, and the second one-way valve is used for controlling one-way communication between the shell and the drainage bag;

the second one-way valve divides the inner cavity of the shell into a first cavity and a second cavity, the first one-way valve is arranged in the first cavity, and the second cavity is communicated with the drainage bag.

2. The drainage apparatus of claim 1, wherein the first one-way valve is adapted to effect a non-communication between the first chamber and the drainage tube and the second one-way valve is adapted to effect a one-way communication from the first chamber to the second chamber when the pressure in the first chamber is greater than the pressure in the drainage tube and the second chamber;

when the pressure in the first cavity is equal to the pressure in the drainage tube and the second cavity, the first one-way valve is used for realizing the non-communication between the first cavity and the drainage tube, and the second one-way valve is used for realizing the non-communication between the first cavity and the second cavity;

when the pressure in the first cavity is lower than the pressure in the drainage tube and the second cavity, the first one-way valve is used for realizing one-way communication from the drainage tube to the first cavity, and the second one-way valve is used for realizing non-communication between the first cavity and the second cavity.

3. The drainage device of claim 1, wherein the housing has a squeezed state and a restored state, the volume of space of the first cavity when the housing is in the squeezed state being less than the volume of space of the first cavity when the housing is in the restored state;

when the housing is transformed from a recovery state to a compression state, the pressure in the first chamber is increased; the pressure within the first chamber decreases when the housing transitions from the squeezed state to the restored state.

4. The drainage device of claim 3, wherein the housing is made of an elastic material.

5. The drainage device of claim 1, wherein the connection between the drain tube and the drain valve assembly, and the drain valve assembly and the drain bag is via luer fittings.

6. The drainage device of claim 1, wherein the drainage valve assembly includes an inlet passage and an outlet passage provided on the housing, the inlet passage communicating with the drainage tube; the liquid outlet channel is communicated with the drainage bag.

7. The drainage device of claim 6, wherein the housing comprises an upper shell, an outer shell, and a lower shell; the upper shell, the shell and the lower shell are detachably connected; wherein, the liquid inlet channel is arranged on the upper shell, and the liquid outlet channel is arranged on the lower shell.

8. The drainage device of claim 6, wherein the first one-way valve is a thin film sheet one-way valve; the second one-way valve is a duckbill one-way valve.

9. The drainage device according to claim 8, wherein the first check valve is a membrane check valve, the membrane check valve comprises two membranes, a membrane valve port is formed between the two membranes, and the membrane valve port is communicated with one end of the liquid inlet channel far away from the drainage tube;

when the pressure in the first cavity is greater than or equal to the pressure in the drainage tube, the two thin film sheets are closed to realize the non-communication between the first cavity and the drainage tube;

when the pressure in the first cavity is lower than the pressure in the drainage tube, the two thin film sheets are relatively opened so as to realize the one-way communication between the drainage tube and the first cavity.

10. The drainage device of claim 9, wherein the second one-way valve is a duckbill one-way valve comprising a duckbill valve port, a mounting plate, and a duckbill structure; wherein

The edge of the mounting plate is fixedly connected with the inner wall of the shell, the mounting plate divides the inner cavity of the shell into a first cavity and a second cavity, the duckbill valve port is positioned in the first cavity, the duckbill structure is positioned in the second cavity, and the inner cavity of the duckbill valve port is communicated with the gap on the duckbill structure;

when the pressure in the first cavity is smaller than or equal to the pressure in the second cavity, the gap on the duckbill structure is closed, so that the first cavity is not communicated with the second cavity;

when the pressure in the first cavity is higher than the pressure in the second cavity, the gap in the duckbill structure is opened, so that the one-way communication between the first cavity and the second cavity is realized.

11. The drainage device of claim 1, wherein the drainage tube is provided with a first flushing port, and the upper portion of the housing is provided with a second flushing port.

12. The drainage device of claim 1, wherein a fixation structure is provided on the drainage bag for securing the drainage bag to the target phantom body.

13. The drainage device according to claim 1, wherein the drainage bag is provided with a vent hole and/or a drain hole.

14. The drainage device of any of claims 1 to 13, wherein the drainage device is for thoracic or abdominal drainage.