A reusable abdominal fluid drainage device

Abstract

This invention provides a reusable ascites drainage device, comprising: a drainage seat, a drainage tube, a negative pressure assembly, and a collection container; one end of the drainage tube is connected to the drainage seat, and the negative pressure assembly and the collection container are both connected to the other end of the drainage tube; the negative pressure assembly is used to generate negative pressure within the drainage tube, allowing ascites fluid from the drainage seat to enter the drainage tube; the collection container is used to collect the ascites fluid draining from the drainage tube; the drainage seat includes an annular shell, one end of which is provided with a self-sealing soft body for sealing; one end of the drainage tube is connected to a puncture needle, which is inserted into and penetrates the self-sealing soft body into the annular shell. This embodiment reduces tissue damage from repeated punctures, improves patient comfort, enhances the precise control of negative pressure within the drainage tube, protects tissues near the drainage seat from damage, and reduces the risk of abdominal infection.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to a reusable device for draining abdominal fluid. Background Technology

[0002] Ascites is a common clinical symptom that occurs in the decompensated stage of cirrhosis, late stage of abdominal tumors, tuberculous peritonitis, and hypoproteinemia. Paracentesis can relieve abdominal distension. The existing paracentesis devices are disposable. After one course of paracentesis, the paracentesis tube needs to be removed to avoid abdominal infection. However, patients with cirrhosis have long-term ascites problems and need to undergo repeated paracentesis and drainage and repeated insertion and removal of the paracentesis tube. Utility Model Content

[0003] This utility model discloses a reusable paracentesis device to solve the problem of repeatedly inserting and removing the paracentesis tube during long-term abdominal paracentesis drainage.

[0004] This utility model provides a reusable abdominal fluid drainage device, including: a drainage seat, a drainage tube, a negative pressure assembly, and a collection container;

[0005] One end of the drainage tube is connected to the drainage seat, and the negative pressure assembly and the collection container are both connected to the other end of the drainage tube; the negative pressure assembly is used to generate negative pressure in the drainage tube, so that the ascites in the drainage seat enters the drainage tube, and the collection container is used to collect the ascites flowing out of the drainage tube;

[0006] The drainage seat is used to fix a fixed connection point to the drainage tube within the subcutaneous tissue. The drainage seat includes an annular shell, one end of which is provided with a self-sealing soft body to achieve a seal at the end of the annular shell, and the other end of the annular shell is used to connect to ascites. The end of the drainage tube connected to the drainage seat is provided with a puncture needle, which is used to insert and penetrate the self-sealing soft body into the annular shell.

[0007] Furthermore, an elastic membrane is provided between the negative pressure component and the drainage tube, and a stable negative pressure is provided by the deformation of the elastic membrane.

[0008] Furthermore, the elastic membrane is made of medical-grade silicone material, and the elastic properties of the medical-grade silicone material cause the elastic membrane to deform under the negative pressure of the negative pressure component.

[0009] Furthermore, the negative pressure assembly includes a cylinder, a piston, and an adjustment structure. The outer edge of the piston is tightly fitted to the inner side of the cylinder, and the adjustment structure is connected to the piston. The adjustment structure controls the movement of the piston within the cylinder to provide negative pressure.

[0010] Furthermore, the adjusting structure includes a screw and a nut. One end of the screw is connected to a piston, and the other end of the screw extends out of the cylinder and is movably connected to the nut. Precise negative pressure is provided by controlling the relative movement of the nut and the screw.

[0011] Furthermore, a semi-permeable membrane is provided at the other end of the annular shell to block macromolecular substances from entering the annular shell.

[0012] Furthermore, a cavity is provided between the self-sealing soft material and the semi-permeable membrane, which protects the semi-permeable membrane from being punctured by the puncture needle.

[0013] Furthermore, the thickness of the drainage seat is no more than 2cm.

[0014] Furthermore, the self-sealing soft body is made of medical-grade silicone material, and the elastic properties of the medical-grade silicone material allow the self-sealing soft body to restore its seal after being punctured.

[0015] Furthermore, the collection container is provided with a liquid outlet, which is connected to a valve.

[0016] As can be seen from the technical solution, the embodiments provided by this utility model have the following advantages:

[0017] 1. This embodiment reduces tissue damage from repeated punctures and improves patient comfort by setting up a drainage seat;

[0018] 2. This embodiment improves the precise control of negative pressure in the drainage tube by directly connecting the negative pressure device to the drainage tube, enhances the stability of the drainage seat, and helps protect the tissue near the drainage seat from damage.

[0019] 3. In this embodiment, the drainage seat is provided with only one self-sealing soft interface to connect with the puncture needle, which can reduce the risk of ascites overflow and leakage, and reduce the risk of abdominal infection. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a reusable abdominal fluid drainage device provided in an embodiment of the present utility model;

[0022] Explanation of reference numerals in the attached drawings: 1. Drainage seat; 11. Annular shell; 12. Self-sealing soft body; 13. Semi-permeable membrane; 14. Cavity; 2. Drainage tube; 21. Puncture needle; 3. Negative pressure assembly; 31. Piston; 32. Cylinder; 33. Screw; 34. Nut; 35. Elastic membrane; 4. Collection container; 41. Collection tube; 42. Valve; 43. Outlet. Detailed Implementation

[0023] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0027] It should be understood that although the steps in the flowcharts of the accompanying figures are shown sequentially as indicated by the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the accompanying figures may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0028] This utility model discloses a reusable abdominal fluid drainage device.

[0029] Please see Figure 1 One embodiment of the reusable paracentesis device provided in this utility model includes:

[0030] 1. Drainage seat; 2. Drainage tube; 3. Negative pressure assembly; and 4. Collection container;

[0031] One end of the drainage tube 2 is connected to the drainage seat 1, and the negative pressure component 3 and the collection container 4 are both connected to the other end of the drainage tube 2. The negative pressure component 3 is used to generate negative pressure in the drainage tube 2 so that the ascites in the drainage seat 1 enters the drainage tube 2. The collection container 4 is used to collect the ascites in the drainage tube 2.

[0032] The drainage seat 1 is used to fix it in the subcutaneous tissue and provide a fixed connection point with the drainage tube 2. The drainage seat 1 includes an annular shell 11. One end of the annular shell 11 is provided with a self-sealing soft body 12 to achieve a seal at the end of the annular shell 11. The other end of the annular shell 11 is used to introduce ascites. The end of the drainage tube 2 connected to the drainage seat 1 is provided with a puncture needle 21. The puncture needle 21 is inserted into and penetrates the self-sealing soft body 12 to enter the annular shell 11.

[0033] Understandably, current paracentesis procedures involve abdominal paracentesis with catheter placement, a single-use procedure. The main steps are as follows: First, the puncture point is selected at the middle and outer third of the line connecting the left anterior superior iliac spine and the umbilicus. Routine disinfection and draping are then performed. Local anesthesia is administered using 2% lidocaine. Next, an intravenous needle is inserted into the abdominal cavity. When pale yellow or bloody fluid is observed, a guidewire is inserted through the needle into the abdominal cavity. The needle is then withdrawn, and an abdominal paracentesis catheter is inserted along the guidewire. The catheter is then withdrawn, and the catheter is successfully placed in the abdominal cavity. Outside the abdominal cavity, a butterfly clamp is used to secure the catheter to the abdominal wall, and a negative pressure drainage bottle is connected to drain the ascites. The abdominal paracentesis catheter has a lifespan of 15 days, after which it must be reinserted.

[0034] Traditional paracentesis requires finding the right puncture point and angle for each puncture. If long-term paracentesis is needed, the paracentesis tube needs to be repeatedly inserted and removed, which can easily damage tissues, increase the probability of abdominal infection, increase the economic burden, increase the patient's suffering, and reduce patient compliance.

[0035] In this embodiment, the drainage seat 1 is a small device implanted in the subcutaneous tissue. The method of fixing the drainage seat 1 in the subcutaneous tissue is similar to that of a fully implantable venous port.

[0036] The fixation method of the puncture seat in the Totally Implanted Venous Access Port (TIVAP) is the same, which can securely fix it in a specific position. In this implementation, the drainage seat 1 is used instead of the traditional puncture tube. The puncture needle 21 of the drainage tube 2 is inserted into the self-sealing soft body 12 of the drainage seat 1 to complete the preparation for paracentesis. The position of the drainage seat 1 is fixed, and the self-sealing soft body 12 can be repeatedly inserted by the puncture needle 21. It is not necessary to find a suitable puncture point and angle to insert the puncture tube every time, making the paracentesis operation simpler and more convenient, and reducing the patient's pain.

[0037] Unlike traditional puncture tubes, the negative pressure adjustment of the drainage seat 1 in this embodiment should be gradual during drainage. When starting drainage, a lower negative pressure should be used first to observe the drainage process and the patient's response. This is because the surrounding tissues need a certain adaptation period after the puncture seat is implanted. Using a higher negative pressure from the beginning may cause pain and discomfort to the patient, or cause the drainage seat 1 to shift. Generally, start with a negative pressure of around -5 mmHg, and gradually increase the negative pressure according to the drainage effect and the patient's tolerance, with each increase not exceeding 3-5 mmHg. Therefore, when using the drainage seat 1, due to its more precise integration with the human tissue structure, the requirement for precise control of the negative pressure is higher. Inaccurate negative pressure may cause tissue damage or affect the drainage effect, while excessive negative pressure may cause excessive adsorption of the tissues around the drainage seat 1, leading to local tissue ischemia and necrosis.

[0038] In existing technologies, negative pressure components are typically mounted on a collection container, which is then connected to the drainage tube. However, this approach has several drawbacks: First, the elasticity and capacity variations of the collection container can interfere with the transmission and control of negative pressure. Second, the collection container's volume and internal structure can create resistance to the flow of ascites fluid. Third, the negative pressure component cannot directly act on the drainage tube, increasing the risk of blockage. Therefore, the existing connection method for negative pressure components cannot meet the precise negative pressure requirements of the drainage seat 1.

[0039] In this embodiment, the negative pressure component 3 is directly connected to the drainage tube 2. This reduces pressure loss, allowing operators to more precisely control the negative pressure and adjust it according to the patient's specific condition (such as the amount and nature of ascites and the patient's tolerance). Furthermore, the negative pressure component 3 in this embodiment ensures that the negative pressure acts directly on the drainage tube 2, avoiding resistance to the flow of ascites from the collection container 4. This allows for faster drainage of ascites and more effective transmission of negative pressure to the interface between the puncture station and the drainage tube 2. Additionally, the direct connection between the negative pressure device and the drainage tube 2 reduces intermediate steps, lowers the risk of blockage, and prevents pressure instability at the drainage station 1 due to blockage in the drainage tube 2, thus avoiding damage to tissues near the drainage station 1.

[0040] Therefore, this embodiment reduces tissue damage from repeated punctures and improves patient comfort by setting up a drainage seat 1. Furthermore, by directly connecting the negative pressure device to the drainage tube 2, the precise control of negative pressure within the drainage tube 2 is enhanced, which helps protect the tissue near the drainage seat 1 from damage. In this embodiment, the drainage seat 1 has only one interface (self-sealing soft body 12) connected to the puncture needle 21, which reduces the risk of ascites leakage and peritoneal infection.

[0041] In a more specific embodiment, an elastic membrane 35 is disposed between the negative pressure component 3 and the drainage tube 2, providing stable negative pressure through the deformation of the elastic membrane 35. It is understood that during the specific implementation, a pressure difference is formed on both sides of the elastic membrane 35 during the process of the negative pressure component 3 generating negative pressure, with the air pressure on the side closer to the drainage tube 2 being higher than that on the side closer to the negative pressure component 3. Due to this pressure difference, the elastic membrane 35 deforms towards the negative pressure component 3. This deformation causes air or ascites in the drainage tube 2 to tend to flow into the low-pressure space between the elastic membrane 35 and the negative pressure component 3, thus reducing the air pressure in the drainage tube 2 and generating negative pressure. In addition, the elastic membrane 35 also has the following functions:

[0042] On the one hand, the elastic membrane 35 can block the ascites fluid in the drainage tube 2 from flowing towards the negative pressure device, allowing the ascites fluid to flow towards the collection container 4, preventing ascites fluid from invading and damaging the negative pressure component 3, and preventing pathogens in the ascites fluid from flowing out through the negative pressure component 3, thus reducing the risk of infection. If ascites fluid enters the negative pressure component 3, it may disrupt the normal pressure difference between the drainage tube 2 and the negative pressure component 3, leading to poor drainage or backflow of ascites fluid. The elastic membrane 35 can prevent this from happening, ensuring that the ascites fluid flows smoothly from the drainage tube 2 into the collection container 4.

[0043] On the other hand, when the drainage seat 1 is connected to the drainage tube 2 for drainage, it is necessary to maintain the stability of the negative pressure. When the negative pressure assembly 3 is working, the negative pressure may fluctuate. The elastic membrane 35 acts as a buffer, like a shock absorber. For example, if the negative pressure assembly 3 experiences a sudden pressure change during startup or shutdown, the elastic membrane 35 can absorb these pressure changes through its elasticity. Without the elastic membrane 35, sudden changes in negative pressure would be directly transmitted to the drainage tube 2 and the drainage seat 1, affecting the drainage rate of ascites and the stability of the drainage seat 1. The elastic membrane 35 can smooth out pressure changes, allowing the negative pressure at the drainage tube 2 and the drainage seat 1 to remain relatively stable for a certain period. Therefore, this embodiment ensures the stability of the negative pressure by setting the elastic membrane 35, which can automatically adjust to keep negative pressure fluctuations within a small range.

[0044] In a more specific embodiment, the elastic membrane 35 is made of medical-grade silicone. The elastic properties of the medical-grade silicone material allow the elastic membrane 35 to deform under the negative pressure of the negative pressure component 3, ensuring complete isolation of ascites in the drainage tube 2 and the negative pressure component 3. It can withstand pressure changes without rupturing and can recover.

[0045] In a more specific embodiment, the negative pressure assembly 3 includes a cylinder 32, a piston 31, and an adjustment structure. The piston 31 is disposed inside the cylinder 32, and the edge of the piston 31 is tightly fitted with the inside of the cylinder 32. By moving the piston 31 through the adjustment structure, the volume of the sealed cavity 14 enclosed by the piston 31 and the cylinder 32 increases, the air pressure decreases, thereby generating negative pressure.

[0046] Understandably, in practice, as the amount of ascites in the collection container 4 increases, the negative pressure in the drainage tube 2 decreases. The negative pressure in the drainage tube 2 can be increased in a timely manner by adjusting the structure according to the amount of ascites in the collection container 4.

[0047] In a more specific embodiment, the side of piston 31 away from drainage tube 2 is connected to one end of connecting rod, and the other end of connecting rod extends out of cylinder 32. By manually pulling the connecting rod, piston 31 is moved to generate negative pressure.

[0048] In some more specific embodiments, the side of piston 31 furthest from drainage tube 2 is connected to screw 33, and a nut 34 is provided on the outside of cylinder 32, which is threadedly connected to screw 33. It is understood that, in specific implementations, rotating nut 34 can drive screw 33 and piston 31 to move within cylinder 32, thereby generating negative pressure. It should be noted that the structure of nut 34 and screw 33 provides a high-precision adjustment method. The pitch of screw 33 is fixed; when nut 34 is rotated, screw 33 moves precisely according to the pitch. This precise linear motion is transmitted to piston 31, allowing for precise control of piston 31's displacement. Furthermore, the nut 34 and screw 33 connection is a mechanical connection method with good stability. Compared to manually pulling piston 31, this structure avoids accidental movement of piston 31 due to hand tremors or uneven force. During the generation of negative pressure, nut 34 and screw 33 can stably fix piston 31 in the desired position. For example, when maintaining a certain negative pressure for ascites drainage over a prolonged period, such as during continuous drainage in some patients with chronic ascites, this stable structure ensures that the negative pressure does not fluctuate, allowing the ascites to be drained continuously and evenly under a stable pressure difference. Furthermore, the piston 31 is adjusted via nut 34 and screw 33 at a relatively slow speed, which helps prevent excessive negative pressure caused by rapid operation. Excessive negative pressure during ascites drainage can cause discomfort to the patient. This slow and stable adjustment method allows medical staff to better perceive changes in negative pressure, stop adjustment in time, and avoid excessive negative pressure, thereby improving the safety of the ascites drainage procedure.

[0049] In a more specific embodiment, the negative pressure component 3 includes a vacuum pump and a microprocessor, with the vacuum pump electrically connected to the microprocessor. The pumping speed and the magnitude of the negative pressure generated by the vacuum pump are automatically adjusted by the microprocessor. When the amount of ascites fluid in the collection container 4 increases, the negative pressure inside the device decreases significantly and becomes ineffective, leading to poor drainage. In this embodiment, the microprocessor utilizes the mechanical principle of the increased ascites fluid volume to provide feedback on the negative pressure adjustment parameters, achieving automatic adjustment of the negative pressure and maintaining smooth drainage of the ascites fluid.

[0050] In a more advanced embodiment, the elastic membrane 35 is disposed within the cylinder 32 and located between the piston 31 and the drain tube 2.

[0051] In a more specific embodiment, a semi-permeable membrane 13 is provided at the other end of the annular shell 11. The semi-permeable membrane 13 allows ascites fluid to pass through but blocks large molecules from entering the annular shell 11. It is understood that ascites fluid contains various electrolytes, such as sodium, potassium, and chloride. Under normal circumstances, the concentration of these electrolytes in the body is relatively stable, and they participate in many physiological functions, including nerve conduction, muscle contraction, and acid-base balance regulation. When ascites fluid is drained, without proper control, large molecules such as proteins may be excreted along with electrolytes. Large amounts of sodium excreted with ascites fluid can lead to hyponatremia, and patients may experience symptoms such as nausea, vomiting, weakness, and altered consciousness. Potassium loss may cause arrhythmias and muscle weakness. Proteinemia refers to a blood protein content below normal levels. Ascites fluid contains a certain amount of protein, such as albumin and globulin. If these proteins are excreted in large quantities with ascites fluid, it will exacerbate hypoproteinemia. Therefore, this embodiment provides a semi-permeable membrane 13 at the end of the annular shell 11 to prevent large molecules such as proteins from being discharged with ascites, which helps maintain the balance of electrolytes in the body and prevents the occurrence of symptoms and complications related to these electrolyte disorders. When the discharge of proteins with ascites is controlled, the development of hypoproteinemia can be delayed to a certain extent. Delaying the progression of hypoproteinemia helps maintain the body's normal physiological functions and buys more time for the patient's treatment and recovery.

[0052] In a more specific embodiment, a cavity 14 is provided between the self-sealing soft body 12 and the semi-permeable membrane 13. It is understood that, in specific implementation, a cavity 14 is left between the self-sealing soft body 12 and the semi-permeable membrane 13 to prevent the puncture needle 21 from directly contacting the semi-permeable membrane 13 and puncturing it after being inserted into the self-sealing soft body 12.

[0053] In a more specific embodiment, the thickness of the drainage seat 1 is no more than 2 cm. It is understood that existing technologies involve inserting a relatively long puncture catheter into the abdominal cavity, typically around 5 cm. When the amount of ascites decreases significantly, the patient experiences noticeable abdominal pain. In contrast, the drainage seat 1 in this embodiment consists only of an annular shell 11, self-sealing soft parts 12 fixed to both ends of the annular shell 11, and a semi-permeable membrane 13. Its structure is simple, and the thickness of the drainage seat 1 is no more than 2 cm, shorter than the length of existing puncture tubes. Therefore, when the amount of ascites decreases, there is no significant pain.

[0054] In a more specific embodiment, the self-sealing soft body 12 is made of medical-grade silicone. It is understood that, in practice, medical-grade silicone has minimal irritation to human tissues and cells, and is unlikely to cause allergic reactions or inflammation. During the long-term implantation of the drainage seat 1 in the human body, the self-sealing soft body 12 will come into contact with surrounding tissues and body fluids; its good biocompatibility ensures that the patient will not experience adverse reactions due to material irritation. Furthermore, medical-grade silicone has excellent elasticity and flexibility. This elasticity allows the diaphragm to deform to a certain extent during puncture to accommodate the insertion of the puncture needle 21, and it can quickly return to its original shape after the puncture needle 21 is withdrawn, ensuring the sealing of the self-sealing soft body 12.

[0055] In a more specific embodiment, the self-sealing soft body 12 is a silicone cap that is plugged into the end of the annular housing 11, and the edge of the silicone cap covers the port of the annular housing 11.

[0056] In a more specific embodiment, the collection container 4 is connected to the drainage tube 2 via the collection tube 41.

[0057] In a more specific embodiment, the bottom of the collection container 4 is provided with a liquid outlet 43, which is connected to a valve 42. The valve 42 is used to drain ascites when the device stops working.

[0058] It should be noted that the terms used to describe positional relationships in the above examples and accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. The various embodiments of this utility model described above are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A reusable device for draining abdominal fluid, characterized in that, include: Drainage seat (1), drainage tube (2), negative pressure assembly (3), and collection container (4); One end of the drainage tube (2) is connected to the drainage seat (1), and the negative pressure component (3) and the collection container (4) are both connected to the other end of the drainage tube (2); the negative pressure component (3) is used to generate negative pressure in the drainage tube (2) so that the ascites in the drainage seat (1) enters the drainage tube (2), and the collection container (4) is used to collect the ascites flowing out of the drainage tube (2); The drainage seat (1) is used to fix a fixed part in the subcutaneous tissue to connect with the drainage tube (2). The drainage seat (1) includes an annular shell (11). One end of the annular shell (11) is provided with a self-sealing soft body (12) to achieve sealing of the end of the annular shell (11). The other end of the annular shell is used to connect to ascites. The end of the drainage tube (2) connected to the drainage seat (1) is provided with a puncture needle (21). The puncture needle (21) is used to insert and penetrate the self-sealing soft body (12) into the annular shell (11).

2. The reusable paracentesis device according to claim 1, characterized in that, An elastic membrane (35) is provided between the negative pressure component (3) and the drainage tube (2), and a stable negative pressure is provided by the deformation of the elastic membrane (35).

3. A reusable paracentesis device according to claim 2, characterized in that, The elastic membrane (35) is made of medical-grade silicone material. The elastic properties of the medical-grade silicone material cause the elastic membrane (35) to deform under the negative pressure of the negative pressure component (3).

4. A reusable paracentesis device according to claim 1, characterized in that, The negative pressure assembly (3) includes a cylinder (32), a piston (31) and an adjustment structure. The outer edge of the piston (31) is tightly fitted with the inner side of the cylinder (32). The adjustment structure is connected to the piston (31) and controls the piston (31) to move within the cylinder (32) to provide negative pressure.

5. A reusable paracentesis device according to claim 4, characterized in that, The adjustment structure includes a screw (33) and a nut (34). One end of the screw (33) is connected to the piston (31), and the other end of the screw (33) extends through the cylinder (32) and is movably connected to the nut (34). Precise negative pressure is provided by controlling the relative movement of the nut (34) and the screw (33).

6. A reusable paracentesis device according to claim 1, characterized in that, A semi-permeable membrane (13) is provided at the other end of the annular shell (11) to block macromolecular substances from entering the annular shell (11).

7. A reusable paracentesis device according to claim 6, characterized in that, A cavity (14) is provided between the self-sealing soft body (12) and the semi-permeable membrane (13). The cavity (14) protects the semi-permeable membrane (13) from being punctured by the puncture needle (21).

8. A reusable paracentesis device according to claim 1, characterized in that, The thickness of the drainage seat (1) is no more than 2cm.

9. A reusable paracentesis device according to claim 1, characterized in that, The self-sealing soft body (12) is made of medical-grade silicone material. The elastic properties of the medical-grade silicone material allow the self-sealing soft body (12) to restore its sealing properties after being punctured.

10. A reusable paracentesis device according to claim 1, characterized in that, The collection container (4) is provided with a liquid outlet (43), which is connected to a valve (42).

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