Closed thoracic drainage system with pressure sensing function

Abstract

The invention discloses a closed thoracic drainage system with a pressure sensing function, and relates to the field of thoracic drainage. A guide tube, a control valve disc and a thoracic cavity internal pressure verification assembly are arranged in the aspirator, when the control valve disc is in a normal position, the guide tube is communicated with the negative pressure environment in the aspirator, a medium negative pressure environment is formed in a verification inner cavity, and accumulated water and pneumatosis introduced by a puncture drainage tube enter the aspirator; when the chest pressure of a patient is verified, the control valve disc is rotated to the limit position of the limiting assembly, the third valve channel is communicated with the guide pipe and the connecting pipe, the second pressure on-off valve is opened, the verification inner cavity is communicated with the atmosphere, and the internal pressure of the verification inner cavity rises to form a negative pressure verification environment slightly lower than the internal pressure of the chest of a normal human body. When the internal pressure of the thoracic cavity of the patient is larger than that of the negative pressure verification environment, the high-pressure response assembly responds, and when the internal pressure of the thoracic cavity of the patient is smaller than that of the negative pressure verification environment, the low-pressure response assembly responds.

Description

Technical Field

[0001] The present invention relates to a chest cavity drainage technology, and in particular to a chest cavity closed drainage system with a pressure sensing function. Background Art

[0002] Thoracic drainage is a surgical procedure involving the placement of a specialized catheter into the pleural cavity, connected to a closed drainage device, to continuously and safely remove abnormal accumulations of gas and fluid within the pleural cavity. It is primarily indicated for a variety of acute and chronic thoracic conditions or pathological conditions caused by trauma, including spontaneous or traumatic pneumothorax, hemothorax, empyema, malignant or refractory large pleural effusions, chylothorax, and routine drainage of exudate and gas after cardiothoracic surgery. Through timely and effective placement of a closed thoracic drain, this procedure can rapidly achieve multiple key therapeutic goals: first, relieving abnormally high pressure or mass effect within the pleural cavity, allowing compressed lung tissue to re-expand and restore normal ventilation, significantly improving the patient's dyspnea and hypoxemia. Second, for active bleeding or persistent air leak, drainage itself can reduce local pressure, aiding hemostasis or promoting closure of the rupture. Furthermore, observation of the nature and quantity of the drain provides real-time, crucial information for diagnosis and subsequent treatment. In general, chest drainage is a basic and life-saving key technology in the fields of thoracic surgery, emergency department and intensive care. Through the direct method of physical drainage, it can quickly correct life-threatening pathophysiological disorders, stabilize the condition, prevent serious complications, buy precious time and lay the foundation for further diagnosis and treatment of the primary disease, and ultimately promote patient recovery and restore normal respiratory and circulatory functions.

[0003] Chinese invention patent publication number CN119113255B discloses a closed chest drainage device comprising a drainage tube and a drainage bottle assembly. The first end of the drainage tube is flexibly connected to an adaptive airbag, which, under the action of gravity, descends to the location of pleural effusion. The adaptive airbag also has a drainage channel disposed within it, equipped with a first and second one-way valves. Furthermore, a pressure-differential-driven diaphragm and a corresponding chamber are disposed on the periphery of the adaptive airbag. The pressure-differential-driven diaphragm oscillates back and forth with changes in the internal pressure of the chest cavity, creating a negative pressure in the drainage channel and directing the effusion into the drainage channel through the first one-way valve. This invention can reduce the difficulty of intubation while completely draining pleural effusion.

[0004] When using existing closed chest drainage devices, medical staff can only judge whether the patient's chest cavity is empty by whether liquid and air are discharged from the drainage tube. However, the normal chest pressure of a human body is generally -3 to -5 cm water column, and it is even lower during inspiration. To ensure that the gas or liquid in the patient's chest cavity can be removed, the negative pressure of the puncture device needs to be set at -15 to -20 cm water column. The puncture negative pressure is much lower than the normal chest cavity pressure. When the end of the drainage tube no longer discharges liquid or air, although medical staff can judge that there is no more water or air accumulation in the patient's chest cavity, they still cannot judge whether the patient's chest cavity has returned to normal negative pressure level, and there is a lack of patient chest negative pressure sensing and detection function. Summary of the Invention

[0005] The purpose of the present invention is to provide a closed chest drainage system with a pressure sensing function to solve the problem that the closed chest drainage device in the prior art cannot sense and detect whether the internal pressure of the patient's chest cavity has returned to a normal negative pressure level.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a closed chest drainage system with a pressure sensing function, comprising an aspirator, wherein the aspirator is respectively connected to a negative pressure port connected to a negative pressure generating device and a suction port connected to a puncture drainage tube, and further comprising:

[0007] A guide tube is connected to the interior of the aspirator and to the suction port, a connecting tube and a catheter are connected to the middle of the guide tube, a control valve disc is connected to the guide tube at the intersection of the connecting tube and the catheter, a limit assembly for limiting the rotation of the control valve disc is connected to the aspirator, and a first valve channel, a second valve channel, and a third valve channel are opened on the control valve disc;

[0008] A chest cavity internal pressure verification component installed inside the suction device, the chest cavity internal pressure verification component including a verification outer cavity and a verification inner cavity connected to the inner wall of the suction device and sleeved with each other, the verification outer cavity being connected to the guide tube via the connecting tube, the verification inner cavity being connected to the guide tube via the catheter, a first pressure on-off valve being provided in the guide tube, a second pressure on-off valve connected to the atmosphere being provided in the verification inner cavity, the opening pressure of the second pressure on-off valve being lower than that of the first pressure on-off valve, and a low-pressure response component and a high-pressure response component being connected to the verification inner cavity;

[0009] When the control valve disc is in the initial position, the first valve channel connects the upper and lower ends of the guide tube, and the second valve channel connects the lower end of the guide tube and the guide tube;

[0010] When the control valve disc rotates to the extreme control position of the limit assembly, the third valve channel is connected to the upper end of the guide pipe and the connecting pipe.

[0011] Preferably, the first pressure opening and closing valve includes a first spring connected to the inside of the catheter and a first locking ball connected to the end of the first spring, the first locking ball abuts the connecting hole between the verification inner cavity and the guide tube, the second opening and closing valve includes a second spring connected to the verification inner cavity and a second locking ball connected to the end of the second spring, the second locking ball abuts the connecting hole between the verification inner cavity and the atmosphere, and the first spring and the second spring are both pre-compressed.

[0012] Preferably, the low-pressure response component includes a second mounting plate connected to the upper surface of the outer wall of the verification inner cavity and a second sliding rod connected to the second mounting plate, and the upper end of the second sliding rod slides and extends out of the attractor. The high-pressure response component includes a first mounting plate connected to the lower surface of the inner wall of the verification inner cavity and a first sliding rod connected to the first mounting plate, and the upper end of the first sliding rod slides and extends out of the attractor.

[0013] Preferably, the first mounting plate and the second mounting plate are both arranged in an inverted cone shape.

[0014] Preferably, the limiting assembly includes a rotating shaft fixedly connected to the control valve disc, the rotating shaft passes through the guide tube and extends to the outside of the suction device, the end of the rotating shaft is fixedly connected to a rotating block, a torsion spring is connected between the rotating block and the suction device, and a block is connected to the suction device for limiting the rotation angle of the rotating block.

[0015] Preferably, two blocks are provided, and the torsion spring is pre-bent. When the rotating block is in the initial position and abuts against one of the blocks, the first valve channel connects the upper and lower ends of the guide tube, and the second valve channel connects the lower end of the guide tube and the catheter. When the rotating block rotates to the extreme position and contacts the other block, the third valve channel connects the upper end of the guide tube and the connecting tube.

[0016] Preferably, the outer wall of the control valve disc is tightly fitted with the inner wall of the guide tube.

[0017] Preferably, the suction device is connected to a sealing cover for sealing the second opening and closing valve.

[0018] Preferably, the suction device is connected to a liquid discharge port.

[0019] Compared with the prior art, the present invention provides a closed chest drainage system with a pressure sensing function. By arranging a guide tube, a control valve disc and a chest cavity internal pressure verification component inside the suction device, when the control valve disc is in a normal position, the guide tube is connected to the negative pressure environment inside the suction device, and the verification inner cavity is connected to the negative pressure environment inside the suction device through the first pressure opening and closing valve and the guide tube, forming a medium negative pressure environment in the verification inner cavity. At this time, the accumulated water and accumulated air introduced by the puncture drainage tube enter the suction device; when verifying the patient's chest cavity pressure, the control valve disc is rotated to the extreme position of the limit component, and the first valve channel and the second valve channel are closed. Block, the third valve channel connects the guide tube and the connecting tube, at this time open the second pressure on-off valve, verify that the inner cavity is connected to the atmosphere to inhale some air, so that the internal pressure of the inner cavity increases to form a negative pressure verification environment slightly lower than the normal human chest pressure, verify that the inside of the outer cavity is connected to the patient's chest cavity, when the patient's chest cavity pressure is greater than the pressure of the negative pressure verification environment, the high-pressure response component responds, proving that the patient has not recovered and needs to continue drainage treatment, when the patient's chest cavity pressure is less than the pressure of the negative pressure verification environment, the low-pressure response component responds, proving that the patient has recovered well and does not need to continue drainage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0021] Figure 1 A schematic diagram of the overall structure of a closed chest drainage system provided by an embodiment of the present invention;

[0022] Figure 2 A schematic diagram of the cross-sectional structure of an attractor provided by an embodiment of the present invention;

[0023] Figure 3 A schematic diagram of the back structure of the suction device provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the structure of a limit assembly provided in an embodiment of the present invention;

[0025] Figure 5 A schematic structural diagram of a control valve disc in a first working state provided by an embodiment of the present invention;

[0026] Figure 6 This is a schematic structural diagram of the control valve disc in the second working state provided by an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1. Suction device; 2. Negative pressure generating device; 3. Puncture drainage tube; 4. Suction port; 5. Negative pressure port; 6. Drain port; 7. Guide tube; 8. Connecting tube; 9. Control valve disc; 91. First valve channel; 92. Second valve channel; 93. Third valve channel; 94. Rotating shaft; 95. Rotating block; 96. Torsion spring; 97. Stopper; 10. Verify outer cavity; 11. Catheter; 12. First spring; 13. First clamping ball; 14. Second spring; 15. Second clamping ball; 16. Sealing cover; 17. First mounting plate; 18. First slide bar; 19. Second mounting plate; 20. Second slide bar; 21. Verify inner cavity. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0030] As attached Figure 1 To the attached Figure 6 As shown:

[0031] Example 1:

[0032] The present invention provides a closed chest drainage system with a pressure sensing function, including: a closed chest drainage system with a pressure sensing function, comprising an aspirator 1, the aspirator 1 being respectively connected to a negative pressure port 5 connected to a negative pressure generating device 2 and a suction port 4 connected to a puncture drainage tube 3, the negative pressure generating device 2 being a separate device or connected to a wall negative pressure system, mainly forming a negative pressure environment of -15 to -20 cm H2O in the aspirator 1, the puncture drainage tube 3 being a puncture instrument of general specifications, being used to be inserted into the patient's chest cavity, connecting the patient's chest cavity with the aspirator 1, and further comprising:

[0033] The guide tube 7 is connected to the inside of the suction device 1 and is connected to the suction port 4. The middle part of the guide tube 7 is connected to a connecting tube 8 and a conduit 11. The guide tube 7 is connected to a control valve disc 9 at the intersection of the connecting tube 8 and the conduit 11. The suction device 1 is connected to a limit assembly for limiting the rotation of the control valve disc 9. The control valve disc 9 is provided with a first valve channel 91, a second valve channel 92 and a third valve channel 93. The outer wall of the control valve disc 9 is tightly fitted with the inner wall of the guide tube 7 to ensure that liquid and gas can only pass through each valve channel, thereby improving the sealing performance of the control valve disc 9;

[0034] The chest cavity internal pressure verification component installed inside the suction device 1 includes a verification outer cavity 10 and a verification inner cavity 21 connected to the inner wall of the suction device 1 and sleeved with each other, the verification outer cavity 10 is communicated with the guide tube 7 through the connecting tube 8, and the verification inner cavity 21 is communicated with the guide tube 7 through the catheter 11, a first pressure opening and closing valve is provided in the guide tube 7, and a second pressure opening and closing valve connected to the atmosphere is provided in the verification inner cavity 21, a sealing cover 16 for sealing the second opening and closing valve is connected to the suction device 1, the opening pressure of the second pressure opening and closing valve is less than that of the first pressure opening and closing valve, a low-pressure response component and a high-pressure response component are connected to the verification inner cavity 21, and the negative pressure of the negative pressure generating device 2 can be set to -20 cm water column in specific use, the opening pressure of the first pressure opening and closing valve is controlled to 10 cm water column, and the opening pressure of the second pressure opening and closing valve is controlled to 2 cm water column;

[0035] When the control valve disc 9 is in the initial position, the first valve channel 91 connects the upper and lower ends of the guide tube 7, and the second valve channel 92 connects the lower end of the guide tube 7 and the catheter 11. The fluid and gas accumulated in the patient's pleural cavity enter the aspirator 1 through the puncture drainage tube 3 and the guide tube 7, and the first on-off valve is opened, forming a negative pressure of -10 cm water column inside the verification outer cavity 10 and the verification inner cavity 21. Then, the sealing cover 16 is rotated, and the second on-off valve is opened to connect to the atmosphere, and a negative pressure of -2 cm water column is formed inside the verification outer cavity 10 and the verification inner cavity 21;

[0036] When the control valve disc 9 rotates to the extreme control position of the limit assembly, the third valve channel 93 connects the upper end of the guide tube 7 and the connecting tube 8. When the internal pressure of the patient's chest cavity is lower than -2 cm water column, the low-pressure response assembly responds. When the internal pressure of the patient's chest cavity is greater than -2 cm water column, the high-pressure response assembly responds.

[0037] As can be seen from the above, the present invention provides a closed chest drainage system with a pressure sensing function. By arranging a guide tube 7, a control valve disc 9 and a chest pressure verification component inside the suction device 1, when the control valve disc 9 is in a normal position, the guide tube 7 is connected to the negative pressure environment inside the suction device 1, and the verification inner cavity 21 is connected to the negative pressure environment inside the suction device 1 through the first pressure opening and closing valve and the guide tube 7, forming a medium negative pressure environment in the verification inner cavity 21. At this time, the accumulated water and accumulated air introduced by the puncture drainage tube 3 enter the suction device 1; when verifying the patient's chest pressure, the control valve disc 9 is rotated to the extreme position of the limit component, and the first valve channel 91 and the second valve The passage 92 is blocked, and the third valve passage 93 is connected to the guide tube 7 and the connecting tube 8. At this time, the second pressure on-off valve is opened, and the verification inner cavity 21 is connected to the atmosphere to inhale some air, so that the internal pressure of the verification inner cavity 21 increases to form a negative pressure verification environment slightly lower than the normal internal pressure of the human chest cavity, and the interior of the verification outer cavity 10 is connected to the patient's chest cavity. When the internal pressure of the patient's chest cavity is greater than the pressure of the negative pressure verification environment, the high-pressure response component responds, proving that the patient has not recovered and needs to continue drainage treatment. When the internal pressure of the patient's chest cavity is less than the pressure of the negative pressure verification environment, the low-pressure response component responds, proving that the patient has recovered well and does not need to continue drainage treatment.

[0038] As attached Figure 2 As shown: the first pressure opening and closing valve includes a first spring 12 connected to the inside of the conduit 11 and a first clamping ball 13 connected to the end of the first spring 12, the first clamping ball 13 abuts the connection hole between the verification inner cavity 21 and the guide tube 7, the second opening and closing valve includes a second spring 14 connected to the verification inner cavity 21 and a second clamping ball 15 connected to the end of the second spring 14, the second clamping ball 15 abuts the connection hole between the verification inner cavity 21 and the atmosphere, the first spring 12 and the second spring 14 are both pre-compressed When the internal pressure of the catheter 11 is less than -10 cm water column, the first card ball 13 is sucked and compresses the first spring 12, so that the internal pressure of the verification outer cavity 10 and the verification inner cavity 21 is 10 cm water column higher than the pressure of the negative pressure generating device 2. Then the sealing cover 16 is unscrewed, and the external atmospheric pressure acts on the second card ball 15. The second card ball 15 is forced to compress the second spring 14, so that the internal pressure of the verification outer cavity 10 and the verification inner cavity 21 is 2 cm water column lower than the normal atmospheric pressure. The negative pressure environment of -2 cm water column is used as the verification environment for the internal pressure of the patient's chest cavity.

[0039] The low-pressure response component includes a second mounting plate 19 connected to the upper surface of the outer wall of the verification inner cavity 21 and a second slide rod 20 connected to the second mounting plate 19, and the upper end of the second slide rod 20 slides and extends out of the suction device 1. The high-pressure response component includes a first mounting plate 17 connected to the lower surface of the inner wall of the verification inner cavity 21 and a first slide rod 18 connected to the first mounting plate 17, and the upper end of the first slide rod 18 slides and extends out of the suction device 1.

[0040] As attached Figure 2 To the attached Figure 6 As shown: when the third valve channel 93 is connected to the upper end of the guide tube 7 and the connecting tube 8, it is verified that the pressure value in the outer cavity 10 is equal to the internal pressure of the patient's chest cavity. If the internal pressure of the patient's chest cavity is less than -2 cm water column, the pressures on both sides of the second mounting plate 19 are different, and the pressure at the bottom is greater than the pressure at the top. The second mounting plate 19 drives the second slide bar 20 to slide upward. The medical staff judges that the internal pressure of the patient's chest cavity is less than -2 cm water column by sliding the second slide bar 20 upward, which is close to the normal level, indicating that it has returned to normal. If the internal pressure of the patient's chest cavity is greater than -2 cm water column, the pressures on both sides of the first mounting plate 17 are different, and the pressure at the bottom is greater than the pressure at the top. The first mounting plate 17 drives the first slide bar 18 to slide upward. The medical staff judges that the internal pressure of the patient's chest cavity is greater than -2 cm water column by sliding the first slide bar 18 upward, which is higher than the normal level, indicating that it has not returned to normal and drainage treatment needs to be continued.

[0041] To facilitate the first mounting plate 17 and the second mounting plate 19 to be clamped on the verification inner cavity 21, the first mounting plate 17 and the second mounting plate 19 are both arranged in an inverted cone shape, and the upper and lower surface areas of the first mounting plate 17 and the second mounting plate 19 are not much different.

[0042] As attached Figure 3 To the attached Figure 4 As shown: the limiting assembly includes a rotating shaft 94 fixedly connected to the control valve disc 9, the rotating shaft 94 passes through the guide tube 7 and extends to the outside of the suction device 1, the end of the rotating shaft 94 is fixedly connected to a rotating block 95, a torsion spring 96 is connected between the rotating block 95 and the suction device 1, and a stop block 97 for limiting the rotation angle of the rotating block 95 is connected to the suction device 1. The rotation of the rotating block 95 can drive the torsion spring 96 to bend and store force.

[0043] There are two stops 97, and the torsion spring 96 is pre-bent. When the rotating block 95 is in the initial position and abuts against one of the stops 97, the first valve channel 91 connects the upper and lower ends of the guide tube 7, and the second valve channel 92 connects the lower end of the guide tube 7 and the conduit 11. When the rotating block 95 rotates to the extreme position and contacts the other stopper 97, the third valve channel 93 connects the upper end of the guide tube 7 and the connecting tube 8.

[0044] The aspirator 1 is connected to a drain port 6 for draining the accumulated liquid inside the aspirator 1 .

[0045] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A closed chest drainage system with a pressure sensing function, comprising an aspirator (1), wherein the aspirator (1) is respectively connected to a negative pressure port (5) connected to a negative pressure generating device (2) and a suction port (4) connected to a puncture drainage tube (3), characterized in that: Also includes: A guide tube (7) is connected to the inside of the suction device (1) and is connected to the suction port (4); a connecting tube (8) and a conduit (11) are connected to the middle of the guide tube (7); a control valve disc (9) is connected to the guide tube (7) at the intersection of the connecting tube (8) and the conduit (11); a limit assembly for limiting the rotation of the control valve disc (9) is connected to the suction device (1); and a first valve channel (91), a second valve channel (92) and a third valve channel (93) are provided on the control valve disc (9); A chest cavity internal pressure verification component is installed inside the suction device (1), and the chest cavity internal pressure verification component includes a verification outer cavity (10) and a verification inner cavity (21) connected to the inner wall of the suction device (1) and sleeved with each other, the verification outer cavity (10) is connected to the guide tube (7) through the connecting tube (8), and the verification inner cavity (21) is connected to the guide tube (7) through the catheter (11), a first pressure opening and closing valve is provided in the guide tube (7), and a second pressure opening and closing valve connected to the atmosphere is provided in the verification inner cavity (21), the opening pressure of the second pressure opening and closing valve is lower than that of the first pressure opening and closing valve, and a low-pressure response component and a high-pressure response component are connected to the verification inner cavity (21); When the control valve disc (9) is in the initial position, the first valve passage (91) connects the upper and lower ends of the guide tube (7), and the second valve passage (92) connects the lower end of the guide tube (7) and the guide tube (11); When the control valve disc (9) rotates to the limit control position of the limit assembly, the third valve channel (93) connects the upper end of the guide pipe (7) and the connecting pipe (8).

2. A closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The first pressure opening and closing valve comprises a first spring (12) connected to the inside of the conduit (11) and a first locking ball (13) connected to the end of the first spring (12), wherein the first locking ball (13) abuts against the connection hole between the verification inner cavity (21) and the guide tube (7); the second opening and closing valve comprises a second spring (14) connected to the verification inner cavity (21) and a second locking ball (15) connected to the end of the second spring (14), wherein the second locking ball (15) abuts against the connection hole between the verification inner cavity (21) and the atmosphere; and the first spring (12) and the second spring (14) are both pre-compressed.

3. The closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The low-pressure response component includes a second mounting plate (19) connected to the upper surface of the outer wall of the verification inner cavity (21) and a second slide bar (20) connected to the second mounting plate (19), and the upper end of the second slide bar (20) slides and extends out of the suction device (1). The high-pressure response component includes a first mounting plate (17) connected to the lower surface of the inner wall of the verification inner cavity (21) and a first slide bar (18) connected to the first mounting plate (17), and the upper end of the first slide bar (18) slides and extends out of the suction device (1).

4. A closed chest drainage system with pressure sensing function according to claim 3, characterized in that: The first mounting plate (17) and the second mounting plate (19) are both arranged in an inverted cone shape.

5. The closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The limit assembly includes a rotating shaft (94) fixedly connected to the control valve disc (9), the rotating shaft (94) passes through the guide tube (7) and extends to the outside of the suction device (1), the end of the rotating shaft (94) is fixedly connected to a rotating block (95), a torsion spring (96) is connected between the rotating block (95) and the suction device (1), and a stopper (97) is connected to the suction device (1) for limiting the rotation angle of the rotating block (95).

6. The closed chest drainage system with pressure sensing function according to claim 5, characterized in that: There are two stoppers (97), and the torsion spring (96) is pre-bent. When the rotating block (95) is in the initial position and contacts one of the stoppers (97), the first valve channel (91) connects the upper and lower ends of the guide tube (7), and the second valve channel (92) connects the lower end of the guide tube (7) and the conduit (11). When the rotating block (95) rotates to the extreme position and contacts the other stopper (97), the third valve channel (93) connects the upper end of the guide tube (7) and the connecting tube (8).

7. The closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The outer wall of the control valve disc (9) is tightly fitted with the inner wall of the guide tube (7).

8. The closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The suction device (1) is connected to a sealing cover (16) for sealing the second opening and closing valve.

9. The closed chest drainage system with pressure sensing function according to claim 1, characterized in that: The aspirator (1) is connected to a liquid discharge port (6).

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