A pleural effusion extraction device for tumor treatment

Abstract

The present application relates to the technical field of medical apparatus and discloses a pleural effusion extraction device for tumor treatment, which comprises a reciprocating drive mechanism and a pressure type flow control mechanism, and the internal structure comprises a lower longitudinal hollow shell installed at the bottom of the upper longitudinal hollow shell and internally hollow, a first liquid check valve and a second liquid check valve capable of controlling the one-way flow of liquid, and a movable valve plate capable of controlling the maximum suction of liquid during suction. The pleural effusion extraction device for tumor treatment can suck out the liquid in the thoracic cavity, and can control the speed and suction force during the suction process. Once the suction force is too large, the device can timely adjust the suction force to prevent damage caused by excessive suction force.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a device for draining pleural effusion for tumor treatment. Background Technology

[0002] Malignant pleural effusion is a common complication of advanced malignant tumors, most frequently seen in lung cancer, breast cancer, and lymphoma. Its formation mechanism mainly involves tumor cells directly invading the pleural capillaries, leading to increased vascular permeability and obstructed lymphatic drainage. Large amounts of effusion compress lung tissue, causing symptoms such as dyspnea, chest pain, and cough, severely impacting quality of life and prognosis. Currently, the main clinical treatments for pleural effusion include therapeutic thoracentesis and thoracic tube drainage.

[0003] Traditional thoracentesis involves using a large needle (such as a 16G needle with a stopcock) connected to a syringe for manual aspiration, or connecting a disposable drain and relying on gravity drainage based on natural pressure difference. The practical problems include: ① Low efficiency and heavy operator workload: Manual aspiration is labor-intensive, and the amount aspirated at one time is limited (usually no more than 1000mL). Repeated procedures for patients with large effusions prolong treatment time. ② Inaccurate pressure control and high risk: Gravity drainage is slow. If drainage is too fast or excessive, the intrathoracic pressure drops suddenly, easily leading to the serious complication of re-expansion pulmonary edema. Furthermore, the puncture process relies heavily on the operator's feel and experience, posing a risk of accidental injury to intercostal vessels, nerves, or intestinal muscles. ③ Low visualization: The entire puncture and drainage process lacks real-time, intuitive guidance, making it a "blind" or "semi-blind" procedure. Central venous catheter drainage has become increasingly popular in recent years due to its minimally invasive nature and indwelling capability. However, practical problems exist: ① Poor drainage and catheter blockage: Malignant effusions often contain large amounts of protein and tumor cells, which can easily form a framework that blocks the catheter's side holes, leading to drainage interruption. This necessitates repeated flushing or catheter replacement, increasing patient suffering and the risk of infection. ② Conflict between drainage speed and safety: While both rely on gravity drainage, medical staff sometimes use syringes for manual aspiration to increase the speed. However, this introduces the risk of inaccurate pressure control, potentially leading to pleural reaction or pulmonary edema.

[0004] Clearly, both of these methods share a common drawback: they have relatively poor control over suction pressure and suction speed. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a pleural effusion aspiration device for tumor treatment, which can aspirate fluid from the pleural cavity. During the aspiration process, the device can control the aspiration speed and suction force. If the suction force is too strong, the device can adjust the suction intensity in time to prevent damage caused by excessive suction, thus solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a pleural effusion aspiration device for tumor treatment, comprising an anti-slip sleeve and a drive motor fixedly installed inside a motor mounting base, and a reciprocating drive mechanism, the structure of which includes an upper longitudinal hollow shell sleeved at the center of the anti-slip sleeve and having a hollow internal structure, a rotating wheel located inside the upper longitudinal hollow shell and capable of rotating with the rotor of the drive motor, a reciprocating groove disposed on the outer circumferential surface of the rotating wheel, a raised guide head inserted into the reciprocating groove and capable of generating longitudinal reciprocating motion when the reciprocating groove rotates, and a piston plate placed inside the upper longitudinal hollow shell and capable of longitudinal reciprocating motion with the raised guide head, and performing liquid compression and suction work on the cavity below it; and a pressure-type flow control mechanism, the internal structure of which includes a lower longitudinal hollow shell installed at the bottom of the upper longitudinal hollow shell and having a hollow internal structure, a first liquid check valve and a second liquid check valve capable of controlling the unidirectional flow of liquid, and a movable valve plate capable of controlling the maximum suction force of liquid during suction.

[0007] Preferably, the reciprocating drive mechanism further includes an upper longitudinal hollow housing. The top of the upper longitudinal hollow housing is provided with a component mounting plate fixedly connected to the bottom of the motor mounting base. Inside the upper longitudinal hollow housing is a cylindrical component movable cavity near its top. The top of the upper longitudinal hollow housing is provided with a rotor through-hole communicating with the top of the cylindrical component movable cavity. Directly below the cylindrical component movable cavity is an upper liquid-drawing cavity with an open bottom. A shaft mounting hole and a rod through-hole are provided between the bottom of the cylindrical component movable cavity and the top of the upper liquid-drawing cavity. A rotatable longitudinal rotating shaft is mounted inside the shaft mounting hole via a bearing. A rotating wheel is fixedly mounted at one end of the longitudinal rotating shaft located inside the cylindrical component movable cavity. The outer circumferential surface of the rotating wheel is provided with a reciprocating groove with a concave structure. The top of the rotating wheel is provided with a rotating fixing groove with a concave structure for fixing and installing the rotor. The upper longitudinal hollow shell has a limiting moving ring that can move longitudinally along the moving cavity of the cylindrical component placed inside the cylindrical component's movable cavity. The inner annular surface of the limiting moving ring is provided with a protruding structure and the end of the protruding guide head is inserted into the reciprocating groove and can slide along the reciprocating groove. The bottom of the limiting moving ring is fixedly installed with a longitudinal movable rod that passes through the rod body through a hole and extends to the inside of the upper liquid extraction cavity. The bottom end of the longitudinal movable rod is fixedly installed with a piston plate that can move axially along the upper liquid extraction cavity. The bottom end of the upper longitudinal hollow shell is provided with an upper docking flange.

[0008] Preferably, the reciprocating chute has a circular projection in the longitudinal direction, and there is a height difference between the lowest and highest points of the reciprocating chute.

[0009] Preferably, the structural shape of the perforated cross section of the rod is consistent with the structural shape of the cross section of the longitudinal movable rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the rod match the structural dimensions of the cross section of the longitudinal movable rod.

[0010] Preferably, when the piston plate moves to the fixed point of its stroke, the closed area formed by the piston plate, the upper suction chamber, the upper docking flange, the liquid flow hose, the insertion channel, the gas reserved chamber, and the elastic gas film is filled with buffer solution, and at this time, the elastic gas film is in a planar state.

[0011] Preferably, the pressure-type flow control mechanism further includes a lower longitudinal hollow shell. A lower docking flange, fixedly mounted on the bottom of the upper docking flange, is provided at the top of the lower longitudinal hollow shell. A lower suction chamber, communicating with the bottom of the upper suction chamber and used for piston plate movement, is provided inside the lower longitudinal hollow shell. An upper medium flow hole is provided at the center of the bottom end of the lower longitudinal hollow shell. A medium flow chamber is provided at the bottom end of the upper medium flow hole. A lower medium flow hole is provided at the bottom end of the medium flow chamber. A movable valve plate, capable of moving axially along the medium flow chamber, is placed inside the medium flow chamber. A medium flow groove for medium flow is provided at the edge of the movable valve plate. A compressed helical spring is placed at the top of the movable valve plate. An annular embedded groove with a concave structure is provided at the bottom of the movable valve plate. An annular sealing ring is embedded in the annular embedded groove. A suction channel and a discharge channel for liquid intake and discharge are provided at the bottom of the lower longitudinal hollow shell. A first liquid check valve and a second liquid check valve are respectively installed inside the suction channel and the discharge channel.

[0012] Preferably, the thickness of the annular sealing ring is greater than the depth of the annular embedded groove, and the inner diameter of the annular sealing ring is greater than the structural diameter of the lower medium flow hole.

[0013] Preferably, the first liquid check valve and the second liquid check valve can control the liquid to be drawn into the lower suction chamber through the suction channel and then discharged outward through the discharge channel.

[0014] Compared with the prior art, the present invention provides a pleural effusion aspiration device for tumor treatment, which has the following beneficial effects: It can suction out fluid from inside the pleural cavity, and during the suction process, it can control the suction speed and suction force. If the suction force is too strong, the device can adjust the suction intensity in time to prevent injury caused by excessive suction. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the present invention; Figure 3 This is a perspective view of the reciprocating drive mechanism in this invention; Figure 4 This is a three-dimensional cross-sectional view of the reciprocating drive mechanism in this invention; Figure 5 This is a perspective view of the rotating wheel in this invention; Figure 6 This is a perspective view of the pressure-type flow control mechanism in this invention; Figure 7 This is a three-dimensional cross-sectional view of the pressure-type flow control mechanism in this invention.

[0016] The components include: 1. Anti-slip sleeve; 2. Motor mounting base; 3. Drive motor; 4. Rotor; 5. Reciprocating drive mechanism; 51. Upper longitudinal hollow shell; 52. Component mounting plate; 53. Columnar component movable cavity; 54. Rotor perforation; 55. Upper liquid extraction cavity; 56. Upper docking flange; 57. Shaft mounting hole; 58. Longitudinal rotating shaft; 59. Rotating wheel; 510. Rotating fixing groove; 511. Reciprocating slide groove; 512. Limiting moving ring; 513. Protruding guide rail head; 514. Longitudinal movable rod. 515. Rod perforation; 516. Piston plate; 6. Pressure-type flow control mechanism; 61. Lower longitudinal hollow shell; 62. Lower docking flange; 63. Lower suction chamber; 64. Upper medium flow hole; 65. Medium flow chamber; 66. Lower medium flow hole; 67. Movable valve plate; 68. Annular sealing ring; 69. Helical spring; 610. Medium flow groove; 611. Suction channel; 612. Discharge channel; 613. No. 1 liquid check valve; 614. No. 2 liquid check valve; 615. Annular embedded groove. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1 and Figure 2 A pleural effusion aspiration device for tumor treatment includes an anti-slip sleeve 1 and a drive motor 3 fixedly installed inside a motor mounting base 2. Before operation, the suction channel 611 and the drainage channel 612 are respectively connected to the suction pipe for suctioning pleural effusion and the drainage pipe for draining effusion.

[0019] To achieve the negative pressure suction and compression discharge function for liquids, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5A reciprocating drive mechanism 5 needs to be installed. Its structure includes an upper longitudinal hollow outer shell 51 fitted at the center of the anti-slip sleeve 1 and having a hollow interior; a rotating wheel 59 located inside the upper longitudinal hollow outer shell 51 and capable of rotating with the rotor 4 of the drive motor 3; a reciprocating groove 511 located on the outer circumference of the rotating wheel 59; a protruding guide head 513 inserted into the reciprocating groove 511 and capable of longitudinal reciprocating motion when the reciprocating groove 511 rotates; and a protruding guide head 513 placed inside the upper longitudinal hollow outer shell 51 and capable of longitudinal reciprocating motion with the protruding guide head 513, and for moving the cavity located below it. When the piston plate 516, which is used for liquid compression and suction, is started, the drive motor 3 is activated, and the rotor 4 drives the rotating wheel 59 to rotate. At this time, the rotating reciprocating slide 511 causes the raised guide head 513 to move longitudinally back and forth, thereby driving the limiting moving ring 512 and the longitudinal moving rod 514, which in turn drives the piston plate 516 to move back and forth inside the upper suction chamber 55. At this time, the liquid located below the piston plate 516 will circulate and generate negative pressure suction and compression discharge, thereby realizing the reciprocating circulation drive of the liquid. By controlling the speed of the drive motor 3, the speed of the liquid during flow can be controlled.

[0020] For the specific structure of the reciprocating drive mechanism 5, please refer to [link / reference]. Figure 3 , Figure 4 and Figure 5It also includes an upper longitudinal hollow outer shell 51, the top of which is provided with a component mounting plate 52 fixedly connected to the bottom of the motor mounting base 2. Inside the upper longitudinal hollow outer shell 51 is a cylindrical component movable cavity 53 near its top. The top of the upper longitudinal hollow outer shell 51 is provided with a rotor through hole 54 communicating with the top of the cylindrical component movable cavity 53. Directly below the cylindrical component movable cavity 53 is an upper liquid extraction cavity 55 with an open bottom. Between the bottom of the cylindrical component movable cavity 53 and the top of the upper liquid extraction cavity 55 are a shaft mounting hole 57 and a rod through hole 515. A longitudinal rotating shaft 58, capable of rotation, is mounted inside the shaft mounting hole 57 via a bearing. A rotating wheel 59 is fixedly mounted at one end of the longitudinal rotating shaft 58, located inside the movable cavity 53 of the cylindrical component. The outer circumferential surface of the rotating wheel 59 is provided with a reciprocating groove 511 of a concave structure. The top end of the rotating wheel 59 is provided with a rotating fixing groove 510 of a concave structure for fixing the rotor 4. A limiting moving ring 512, capable of moving longitudinally along the movable cavity 53, is placed inside the upper longitudinal hollow outer shell 51, located within the movable cavity 53 of the cylindrical component. The inner annular surface of the 2 ring is provided with a raised structure, and the end of the raised guide head 513 is inserted into the reciprocating slide groove 511 and can slide along the reciprocating slide groove 511. The bottom of the limiting moving ring 512 is fixedly installed with a longitudinal movable rod 514 that passes through the rod body through the hole 515 and extends to the inside of the upper liquid extraction chamber 55. The bottom end of the longitudinal movable rod 514 is fixedly installed with a piston plate 516 that can move axially along the upper liquid extraction chamber 55. The bottom end of the upper longitudinal hollow shell 51 is provided with an upper docking flange 56. The longitudinal projection of the reciprocating slide groove 511 is a circular structure, and the reciprocating slide groove 511... There is a height difference between the lowest and highest points. The cross-sectional shape of the rod through hole 515 is consistent with the cross-sectional shape of the longitudinal movable rod 514, both being polygonal structures. The structural dimensions of the cross-sectional shape of the rod through hole 515 match the structural dimensions of the cross-sectional shape of the longitudinal movable rod 514. When the piston plate 516 moves to the fixed point of its stroke, the closed area formed by the piston plate 516, the upper liquid extraction chamber 55, the upper docking flange 56, the liquid flow hose 1, the insertion channel 64, the gas reserved chamber 63, and the elastic gas film 65 is filled with buffer solution. At this time, the elastic gas film 65 is in a planar state.

[0021] To achieve unidirectional flow control of pleural effusion and prevent the negative effects of excessive suction, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 6 and Figure 7A pressure-type flow control mechanism 6 needs to be installed. Its internal structure includes a lower longitudinal hollow shell 61 installed at the bottom of the upper longitudinal hollow shell 51 and having a hollow internal structure; a first liquid check valve 613 and a second liquid check valve 614 that can control the unidirectional flow of liquid; and a movable valve plate 67 that can control the maximum suction force of liquid during aspiration. With the cooperation of the first liquid check valve 613 and the second liquid check valve 614, the pleural effusion in the patient's pleural cavity will be aspirated into the lower aspiration chamber 63 and the upper aspiration chamber 55 through the aspiration tube, and then discharged outward through the discharge tube. During the aspiration process, when the aspiration pressure is greater than the elastic pressure of the helical spring 69, the suction force will cause the movable valve plate 67 to move upward. External gas will then be replenished into the lower aspiration chamber 63 and the upper aspiration chamber 55 in time through the movement gap of the movable valve plate 67 and the upper medium flow hole 64, thereby reducing the suction force in time. This achieves unidirectional flow control of pleural effusion and prevents the negative effects caused by excessive suction force.

[0022] For details regarding the specific structure of the pressure-type flow control mechanism 6, please refer to [link / reference]. Figure 6 and Figure 7 It also includes a lower longitudinal hollow outer shell 61, the top of which is provided with a lower docking flange 62 fixedly installed at the bottom of the upper docking flange 56. Inside the lower longitudinal hollow outer shell 61 is a lower suction chamber 63 communicating with the bottom of the upper suction chamber 55 and used for the movement of the piston plate 516. An upper medium flow hole 64 is provided at the center of the bottom end of the lower longitudinal hollow outer shell 61. A medium flow chamber 65 is provided at the bottom end of the upper medium flow hole 64. A lower medium flow hole 66 is provided at the bottom end of the medium flow chamber 65. A movable valve plate 67 capable of moving axially along the medium flow chamber 65 is housed inside the medium flow chamber 65. A medium flow groove 610 for medium flow is provided at the edge of the movable valve plate 67. A compressed state is placed on the top of the movable valve plate 67. The helical spring 69 has a concave annular groove 615 at the bottom of the movable valve plate 67, in which an annular sealing ring 68 is embedded. The bottom of the lower longitudinal hollow shell 61 has a liquid suction channel 611 and a liquid discharge channel 612 for liquid suction and discharge. A first liquid check valve 613 and a second liquid check valve 614 are respectively installed inside the liquid suction channel 611 and the liquid discharge channel 612. The thickness of the annular sealing ring 68 is greater than the depth of the annular groove 615, and the inner diameter of the annular sealing ring 68 is greater than the structural diameter of the lower medium flow hole 66. The first liquid check valve 613 and the second liquid check valve 614 can control the liquid to be drawn into the lower suction chamber 63 through the liquid suction channel 611 and then discharged outward through the liquid discharge channel 612.

[0023] In use, the suction channel 611 and the drainage channel 612 are connected to the suction pipe for suctioning pleural effusion and the drainage pipe for draining effusion, respectively. The drive motor 3 is started, and the rotor 4 drives the rotating wheel 59 to rotate. At this time, the rotating reciprocating groove 511 causes the raised guide head 513 to move longitudinally back and forth, thereby driving the limiting moving ring 512 and the longitudinal moving rod 514, which in turn drives the piston plate 516 to move back and forth inside the upper suction chamber 55. At this time, the liquid below the piston plate 516 circulates, generating negative pressure for suction and compression. The discharge phenomenon is achieved by reciprocating and circulating the liquid. By controlling the speed of the drive motor 3, the speed of the liquid flow can be controlled. During the process of the liquid being sucked in, when the suction pressure is greater than the elastic pressure of the spiral spring 69, the suction will cause the movable valve plate 67 to move upward. The external gas will then be replenished into the lower suction chamber 63 and the upper suction chamber 55 through the movement gap of the movable valve plate 67 and the upper medium flow hole 64, thereby reducing the suction in time. This achieves unidirectional flow control of the pleural effusion and prevents the negative effects caused by excessive suction.

[0024] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for aspirating pleural effusion for tumor treatment, comprising an anti-slip sleeve (1) and a drive motor (3) fixedly installed inside a motor mounting base (2), characterized in that: It also includes, The reciprocating drive mechanism (5) includes an upper longitudinal hollow shell (51) sleeved at the center of the anti-slip sleeve (1) and having a hollow structure inside; a rotating wheel (59) located inside the upper longitudinal hollow shell (51) and capable of rotating with the rotor (4) of the drive motor (3); a reciprocating groove (511) set on the outer circumference of the rotating wheel (59); a protruding guide head (513) inserted into the reciprocating groove (511) and capable of generating longitudinal reciprocating motion when the reciprocating groove (511) rotates; and a piston plate (516) placed inside the upper longitudinal hollow shell (51) and capable of longitudinal reciprocating motion with the protruding guide head (513) and performing liquid compression and suction work on the cavity located below it. And a pressure-type flow control mechanism (6), whose internal structure includes a lower longitudinal hollow shell (61) installed at the bottom of the upper longitudinal hollow shell (51) and having a hollow internal structure, a first liquid check valve (613) and a second liquid check valve (614) capable of controlling the unidirectional flow of liquid, and an active valve plate (67) capable of controlling the maximum suction force of liquid during the suction process.

2. The pleural effusion aspiration device for tumor treatment according to claim 1, characterized in that: The reciprocating drive mechanism (5) further includes an upper longitudinal hollow shell (51). The top of the upper longitudinal hollow shell (51) is provided with a component mounting plate (52) fixedly connected to the bottom of the motor mounting base (2). The interior of the upper longitudinal hollow shell (51) is provided with a cylindrical component movable cavity (53) near its top. The top of the upper longitudinal hollow shell (51) is provided with a rotor through hole (54) communicating with the top of the cylindrical component movable cavity (53). The cylindrical component movable cavity (53)... A liquid extraction chamber (55) with an open bottom is provided directly below. A shaft mounting hole (57) and a rod through hole (515) are provided between the bottom end of the cylindrical component movable cavity (53) and the top end of the upper liquid extraction chamber (55). A rotatable longitudinal rotating shaft (58) is installed inside the shaft mounting hole (57) through a bearing. A rotating wheel (59) is fixedly installed at one end of the longitudinal rotating shaft (58) located inside the cylindrical component movable cavity (53). The outer side of the rotating wheel (59) The circumferential surface is provided with a reciprocating groove (511) with a concave structure. The top of the rotating wheel (59) is provided with a rotating fixing groove (510) with a concave structure for fixing the rotor (4). The upper longitudinal hollow shell (51) has a limiting moving ring (512) that can move longitudinally along the cylindrical component moving cavity (53) inside the cylindrical component moving cavity (53). The inner annular surface of the limiting moving ring (512) is provided with a protruding structure and the end is inserted into the reciprocating groove (511). 11) Inside, a raised guide head (513) that can slide along a reciprocating slide groove (511) is provided. The bottom of the limiting moving ring (512) is fixedly installed with a longitudinal movable rod (514) that passes through a rod body through hole (515) and extends to the inside of the upper liquid extraction chamber (55). The bottom end of the longitudinal movable rod (514) is fixedly installed with a piston plate (516) that can move axially along the upper liquid extraction chamber (55). The bottom end of the upper longitudinal hollow shell (51) is provided with an upper docking flange (56).

3. The pleural effusion aspiration device for tumor treatment according to claim 2, characterized in that: The reciprocating slide (511) has a circular projection in the longitudinal direction, and there is a height difference between the lowest point and the highest point of the reciprocating slide (511).

4. The pleural effusion aspiration device for tumor treatment according to claim 3, characterized in that: The cross-sectional shape of the rod through hole (515) is consistent with the cross-sectional shape of the longitudinal movable rod (514), both being polygonal structures, and the structural dimensions of the cross-sectional shape of the rod through hole (515) match the structural dimensions of the cross-sectional shape of the longitudinal movable rod (514).

5. The pleural effusion aspiration device for tumor treatment according to claim 4, characterized in that: When the piston plate (516) moves to the fixed point of its stroke, the closed area formed by the piston plate (516), the upper liquid extraction chamber (55), the upper docking flange (56), the liquid flow hose (1), the insertion channel (64), the gas reserved chamber (63), and the elastic gas membrane (65) is filled with buffer solution, and at this time, the elastic gas membrane (65) is in a planar state.

6. The pleural effusion aspiration device for tumor treatment according to claim 5, characterized in that: The pressure-type flow control mechanism (6) further includes a lower longitudinal hollow shell (61). A lower docking flange (62) is fixedly mounted on the bottom of the upper docking flange (56) at the top of the lower longitudinal hollow shell (61). A lower suction chamber (63) is provided inside the lower longitudinal hollow shell (61) and communicates with the bottom of the upper suction chamber (55) for the movement of the piston plate (516). An upper medium flow hole (64) is provided at the center of the bottom end of the lower longitudinal hollow shell (61). A medium flow cavity (65) is provided at the bottom end of the upper medium flow hole (64). A lower medium flow hole (66) is provided at the bottom end of the medium flow cavity (65). A device capable of moving along the medium flow cavity (616) is placed inside the medium flow cavity (65). 5) An axially movable valve plate (67) is provided with a medium flow groove (610) for medium flow at the edge of the movable valve plate (67). A coil spring (69) in a compressed state is placed on the top of the movable valve plate (67). An annular embedded groove (615) with a concave structure is provided at the bottom of the movable valve plate (67). An annular sealing ring (68) is embedded in the annular embedded groove (615). The bottom of the lower longitudinal hollow shell (61) is provided with a liquid suction channel (611) and a liquid discharge channel (612) for liquid suction and discharge. A first liquid check valve (613) and a second liquid check valve (614) are respectively installed inside the liquid suction channel (611) and the liquid discharge channel (612).

7. The pleural effusion aspiration device for tumor treatment according to claim 6, characterized in that: The thickness of the annular sealing ring (68) is greater than the depth of the annular embedded groove (615), and the inner diameter of the annular sealing ring (68) is greater than the structural diameter of the lower medium flow hole (66).

8. The pleural effusion aspiration device for tumor treatment according to claim 7, characterized in that: The first liquid check valve (613) and the second liquid check valve (614) can control the liquid to be drawn into the lower suction chamber (63) through the suction channel (611) and then discharged outward through the discharge channel (612).

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