Closed sputum suction system with automatic drainage and liquid level alarm functions

Abstract

The invention discloses a closed sputum suction system with automatic drainage and liquid level alarming functions, and particularly relates to the technical field of drainage and sputum suction, the closed sputum suction system comprises a drainage cover, the upper surface of the drainage cover is communicated with a liquid inlet pipe, and a drainage head is inserted above the liquid inlet pipe; the separating piece is located on the outer wall of the drainage head, and a plurality of limiting strips are installed on the separating piece; the covering part is arranged below the separating part, and a protective block is arranged on the covering part; and the negative pressure head is positioned above the drainage cover and is far away from the liquid inlet pipe. The sputum suction system has the advantages that the possibility of over-limit operation of the sputum suction system is directly eradicated, mucous membrane injury and patient hypoxia risks caused by violation or misoperation of medical staff are effectively avoided, and the safety of drainage and sputum suction is remarkably improved, so that the problem that if the doctor's advice is not strictly followed, the operation is still forcibly continued after the number of sputum suction times specified by a doctor is reached, and the sputum suction efficiency is greatly improved is solved. The safety of drainage and sputum suction of the patient is greatly reduced due to violation or misoperation, and the risk of complications of the patient is increased.

Description

Technical Field

[0001] This invention relates to the field of sputum drainage and suction technology, and more specifically, to a closed sputum suction system with automatic drainage and liquid level alarm. Background Technology

[0002] In the biomedical engineering industry, closed-loop suction systems with automatic drainage offer significant advantages. Utilizing negative pressure, the drainage tube precisely attracts sputum, effectively preventing airway blockage. Traditional suctioning methods are prone to causing airway pressure fluctuations due to sputum accumulation, affecting patient ventilation. This system, however, with its automatic drainage function, continuously and stably clears sputum.

[0003] Among the existing publicly available literature, patent publication number CN111467594A discloses a sputum suction device and system. This technology, by pressing the second through hole, creates a negative pressure space in the suction tube under the action of a negative pressure machine, opening the rubber gasket located at the connection between the inlet and outlet tubes, allowing sputum to flow from the inlet tube to the outlet tube. It has the beneficial effect of allowing for single-handed operation to control the start and stop of suctioning, and is applicable to the field of medical devices. However, this technology still has the following drawbacks.

[0004] During sputum suctioning, the drainage tube needs to be placed in the area where the patient's sputum has accumulated. Suction is used to guide the sputum into the designated storage area. When the amount of sputum is large, multiple consecutive insertions of the tube are often required. However, if the doctor's orders are not strictly followed and the procedure is continued after the number of suctioning attempts has been reached, it can lead to serious risks. On the one hand, excessively frequent suctioning can cause repeated irritation to the suction site, resulting in excessive damage to local tissues, such as mucosal damage and bleeding. On the other hand, it can lead to hypoxia in the patient, affecting their respiratory function and systemic oxygen supply. These violations or errors significantly reduce the safety of sputum suctioning and increase the risk of complications. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides the following technical solution: a closed suction system with automatic drainage and liquid level alarm, including a drainage cover, an inlet pipe connected to the upper surface of the drainage cover, and a drainage head inserted into the upper part of the inlet pipe; The separator is located on the outer wall of the drainage head, and multiple limiting strips are installed on the separator. A cover is disposed below the separator, and a protective block is provided on the cover; The negative pressure head is located above the drainage cap and away from the inlet pipe. A linkage component is installed on the separation component, and a pressure strip is installed on the linkage component; The detection unit is located on one side of the negative pressure head and away from the drainage head, and a switch is provided on the detection unit. When the detection unit's detection switch is pressed more than the set value within a specified time, the separation component will activate multi-directional drive: first, drive multiple limit bars to move vertically, separating the drainage head from the inlet pipe; second, drive the cover component, causing the protective block to move vertically until its lower inclined surface is higher than the top of the inlet pipe, and then horizontally cover and press it onto the top of the inlet pipe; third, drive the linkage component to move horizontally, causing the linkage component to press the pressure strip cover onto the top of the negative pressure head for tightening.

[0006] In a preferred embodiment, the separator includes: A connecting block is fixed on the outer wall of the limiting strip. Both limiting strips are slidably connected to the drainage head. A linkage block is fixed at one end of the connecting block. An electric cylinder is installed on the lower surface of the linkage block. The output end of the electric cylinder is used to push the linkage block to move. The electric cylinder is fixedly connected to the drainage cover.

[0007] In a preferred embodiment, the top of the drainage head is connected to a drainage tube for draining aspirated sputum.

[0008] In a preferred embodiment, the cover includes: A slide bar slides on the inner wall of the connecting block. A compression spring is installed on one side of the slide bar. Both the protective block and the compression spring are fixedly connected to the slide bar. A support bar is connected to one end of a compression spring sheet. Both the connecting block and the compression spring sheet are fixedly connected to the support bar. The lower surface of the protective block is set as an inclined surface.

[0009] In a preferred embodiment, the cross-sectional area of ​​the upper surface of the slide bar is larger than that of its lower surface, and the lower surface of the support bar is arranged parallel to the upper surface of the protective block.

[0010] In a preferred embodiment, the linkage includes: A pull bar is fixed to one side of the connecting block, and a pull rope with an L-shaped vertical cross-section is fixed to the bottom end of the pull bar; An L-shaped sleeve slides on the outer wall of the pull rope. The L-shaped sleeve is used to guide the movement of the pull rope. One end of the pull rope is fixed with a sleeve block, and a sliding rod is installed on one side of the sleeve block. A sleeve is fixed to one end of a sliding rod. The sleeve is fixedly connected to a pressure strip. A guide rod is installed on the inner wall of the sleeve block, and the guide rod is used to guide the sleeve block to slide. A support frame is slidably connected to the outer wall of the sleeve block, and the support frame is fixedly connected to the drainage cover.

[0011] In a preferred embodiment, the slide rod is slidably connected to the support frame, and the center point of the guide rod is not at the same center point as the center point of the slide rod.

[0012] In a preferred embodiment, a support post is fixed between the L-shaped sleeve and the drainage cap, the support post being used to reinforce the L-shaped sleeve.

[0013] In a preferred embodiment, the detection unit includes: A counting bar is fixed to a switch. A pressure sensor is provided at the bottom of the counting bar. The pressure sensor is used to sense the number of times the counting bar is pressed. A controller is fixed at the top of the pressure sensor. The electric cylinder and the pressure sensor are both electrically connected to the controller. The switch is electrically connected to the controller.

[0014] In a preferred embodiment, a housing is fixed to one side of the controller, and an alarm light is installed on the upper surface of the housing near the controller. The inner wall of the drainage cover is threaded with a collection container, which is inserted into the shell. An infrared distance sensor is installed on the upper surface of the drainage cover near its center point. The infrared distance sensor is used to sense the liquid level of the sputum inside the collection container. The infrared distance sensor and the alarm light are both electrically connected to the controller. The top of the negative pressure head is connected to a negative pressure hose, the inner wall of the negative pressure head is provided with a negative pressure pipe, the negative pressure pipe is fixedly connected to the drainage cover, and a negative pressure fan is installed at the bottom of the negative pressure hose.

[0015] The technical effects and advantages of the present invention.

[0016] 1. This invention automatically separates the drainage head from the inlet tube and seals the inlet tube when the number of suction presses exceeds a set value within a specified time by the separation component. At the same time, it locks the negative pressure head and the negative pressure port of the negative pressure tube, directly eliminating the possibility of over-limit operation of the suction system. Compared with the prior art, it effectively avoids the risk of mucosal damage and patient hypoxia caused by medical staff's violation or error operation, and significantly improves the safety of drainage and suction.

[0017] 2. This invention uses an electric cylinder to enable the separation component, the covering component, and the linkage component to operate in unison, converting the count over-limit signal into a series of continuous automatic protection actions. This achieves the synchronous execution of drainage head separation, inlet tube closure, and negative pressure head negative pressure locking. The entire system responds quickly and has a high degree of automation. While ensuring the safety of patient drainage and suction, it also reduces the workload of medical staff in drainage and suction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the closed suction system with automatic drainage and liquid level alarm of the present invention.

[0019] Figure 2 This is a schematic diagram of a partial section of the structure at the connection between the collection tank and the drainage cover of the present invention.

[0020] Figure 3 This is a partial structural diagram of the vertical cross-section of the connection between the inlet pipe and the drain head of the present invention.

[0021] Figure 4 This is a top view of a partial structure of the closed suction system with automatic drainage and liquid level alarm of the present invention.

[0022] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A in the middle.

[0023] Figure 6 For the present invention Figure 4 Enlarged structural diagram at point B.

[0024] Figure 7 This is a partial structural diagram of the connection between the counting bar and the switch in this invention.

[0025] Figure 8 This is a partial structural diagram of the vertical cross-section of the connection between the negative pressure fan and the negative pressure hose of the present invention.

[0026] The attached diagram is labeled as follows: 1. Drainage cap; 2. Inlet pipe; 3. Drainage head; 4. Limiting strip; 5. Protective block; 6. Negative pressure head; 7. Pressure strip; 8. Switch; 9. Connecting block; 10. Linkage block; 11. Electric cylinder; 12. Sliding strip; 13. Compression spring; 14. Support bar; 15. Drainage pipe; 16. Pull bar; 17. Pull rope; 18. L-shaped sleeve; 19. Sliding rod; 20. Sleeve strip; 21. Sleeve block; 22. Guide rod; 23. Support frame; 24. Support column; 25. Counting bar; 26. Pressure sensor; 27. Controller; 28. Alarm light; 29. ​​Housing; 30. Negative pressure hose; 31. Negative pressure fan; 32. Negative pressure pipe; 33. Collection tank; 34. Infrared distance sensor. Detailed Implementation

[0027] 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.

[0028] like Figure 1 - Figure 8As shown, a closed suction system with automatic drainage and liquid level alarm includes a drainage cover 1, an inlet pipe 2 connected to the upper surface of the drainage cover 1, and a drainage head 3 inserted above the inlet pipe 2; a separating component located on the outer wall of the drainage head 3, with multiple limiting strips 4 installed on the separating component; a cover component located below the separating component, with a protective block 5 installed on the cover component; a negative pressure head 6 located above the drainage cover 1 and away from the inlet pipe 2; a linkage component installed on the separating component, with a pressure strip 7 installed on the linkage component; and a detection unit located on the negative pressure head 6. A switch 8 is installed on the detection unit at one side of the pressure head 6 and away from the drainage head 3. When the detection unit detects that the number of times the switch 8 is pressed exceeds the set value within a specified time, the separation component will activate multi-directional drive: first, drive multiple limit bars 4 to move vertically, so that the drainage head 3 is separated from the inlet pipe 2; second, drive the cover component, so that the protective block 5 moves vertically first until its lower inclined surface is higher than the top of the inlet pipe 2, and then horizontally covers and presses on the top of the inlet pipe 2; third, drive the linkage component to move horizontally, and the linkage component drives the pressure bar 7 to cover and press on the top of the negative pressure head 6.

[0029] In this embodiment, as Figure 2 As shown, the separating component includes: a connecting block 9, which is fixed on the outer wall of the limiting strip 4. Both limiting strips 4 are slidably connected to the drainage head 3. A linkage block 10 is fixed at one end of the connecting block 9. An electric cylinder 11 is installed on the lower surface of the linkage block 10. The output end of the electric cylinder 11 is used to push the linkage block 10 to move. The electric cylinder 11 is fixedly connected to the drainage cover 1.

[0030] When this technology is in use, the starter cylinder 11 pushes the linkage block 10 to move upward, the connecting block 9 drives the two limit bars 4 to move upward, and the drain head 3 separates from the liquid inlet pipe 2.

[0031] In this embodiment, as Figure 1 - Figure 3 As shown, the top of the drainage head 3 is connected to a drainage tube 15, which is used to drain aspirated sputum. When the drainage tube 15 is inserted into the patient's sputum area, negative pressure is generated inside the drainage tube 15 to draw the sputum into the drainage head 3.

[0032] In this embodiment, as Figure 3 As shown, the cover includes: a slide bar 12 that slides on the inner wall of the connecting block 9; a compression spring 13 is installed on one side of the slide bar 12; the protective block 5 and the compression spring 13 are both fixedly connected to the slide bar 12; and a support bar 14 connected to one end of the compression spring 13; the connecting block 9 and the compression spring 13 are both fixedly connected to the support bar 14; the lower surface of the protective block 5 is an inclined surface. The cross-sectional area of ​​the upper surface of the slide bar 12 is larger than the cross-sectional area of ​​its lower surface, and the lower surface of the support bar 14 is parallel to the upper surface of the protective block 5.

[0033] When this technology is in use, the upward movement of the connecting block 9 will cause the slide bar 12 to move vertically upward, while the protective block 5 moves vertically upward along the outer wall of the inlet tube 2. When the lower inclined surface of the protective block 5 is higher than the upper surface of the inlet tube 2, the contraction force of the compression spring 13 will cause the slide bar 12 to move to the left, and the slide bar 12 will cause the protective block 5 to move to the left. The protective block 5 will cover the top part of the inlet tube 2, completely avoiding exceeding the set number of suctioning times and avoiding reuse of the inlet tube 2. This avoids injury to the patient caused by overuse.

[0034] In this embodiment, as Figure 4 - Figure 6 As shown, the linkage includes: a pull bar 16, fixed to one side of the connecting block 9, with an L-shaped pull rope 17 fixed to the bottom end of the pull bar 16; an L-shaped sleeve 18, sliding on the outer wall of the pull rope 17, used to guide the movement of the pull rope 17, with a sleeve block 21 fixed to one end of the pull rope 17, and a slide rod 19 installed on one side of the sleeve block 21; a sleeve strip 20, fixed to one end of the slide rod 19, fixedly connected to the pressure strip 7; a guide rod 22 installed on the inner wall of the sleeve block 21, used to guide the sliding of the sleeve block 21; a support frame 23 slidably connected to the outer wall of the sleeve block 21, and fixedly connected to the drainage cover 1. The slide rod 19 is slidably connected to the support frame 23, and the center point of the guide rod 22 and the center point of the slide rod 19 are not at the same center point.

[0035] When this technology is in use, the leftward movement of the connecting block 9 will simultaneously drive the pull strip 16 to move to the left, the pull rope 17 will slide along the inner wall of the L-shaped sleeve 18, the pull rope 17 will drive the sleeve block 21 to move to the left, the sleeve block 21 will be guided to move to the left along the inner wall of the support frame 23, the slide rod 19 will be guided to move to the left along the inner wall of the support frame 23, the sleeve strip 20 will drive the pressure strip 7 to move to the left, the linkage block 10 will cover and press on the top of the negative pressure head 6 and tighten it, thus preventing the collection tank 33 from separating from the shell 29, preventing the negative pressure head 6 from being disassembled from the negative pressure tube 32, completely preventing exceeding the set number of suctioning times, and preventing the negative pressure head 6 from being reused.

[0036] In this embodiment, as Figure 5 As shown, a support column 24 is fixed between the L-shaped sleeve 18 and the drainage cover 1. The support column 24 is used to reinforce the L-shaped sleeve 18. The support column 24 supports the L-shaped sleeve 18 and greatly improves the stability of the L-shaped sleeve 18.

[0037] In this embodiment, as Figure 7As shown, the detection unit includes: a counting bar 25 fixed to the switch 8; a pressure sensor 26 at the bottom of the counting bar 25 for sensing the number of times the counting bar 25 is pressed; a controller 27 fixed to the top of the pressure sensor 26; the electric cylinder 11 and the pressure sensor 26 are electrically connected to the controller 27; and the switch 8 is electrically connected to the controller 27. When the switch 8 needs to be pressed, the counting bar 25 must first be pressed, causing the counting bar 25 to press against the switch 8, with the bottom of the counting bar 25 pressing against the pressure end of the pressure sensor 26. This counts as one press, at which point the controller 27 starts timing. The switch 8 is then pressed repeatedly within a set time by the controller 27, and the number of presses is counted.

[0038] In this embodiment, as Figure 1 - Figure 2 As shown, a housing 29 is fixed to one side of the controller 27. An alarm light 28 is installed on the upper surface of the housing 29 near the controller 27. A collection container 33 is threadedly connected to the inner wall of the drainage cover 1. The collection container 33 is inserted into the housing 29. An infrared distance sensor 34 is installed on the upper surface of the drainage cover 1 near its center point. The infrared distance sensor 34 is used to sense the liquid level of the sputum inside the collection container 33. Both the infrared distance sensor 34 and the alarm light 28 are electrically connected to the controller 27. The sputum is drawn into the collection container 33, which is positioned and docked to the housing 29. The sputum can collect inside the collection container 33. When the distance value sensed by the infrared distance sensor 34 is the alarm distance set by the controller 27, the alarm light 28 is turned on by the controller 27 to realize the alarm operation.

[0039] In this embodiment, as Figure 8 As shown, a negative pressure hose 30 is connected to the top of the negative pressure head 6, and a negative pressure pipe 32 is provided on the inner wall of the negative pressure head 6. The negative pressure pipe 32 is fixedly connected to the drainage cover 1, and a negative pressure fan 31 is installed at the bottom of the negative pressure hose 30. The negative pressure fan 31 generates negative pressure on the negative pressure hose 30, and the negative pressure hose 30 generates negative pressure on the negative pressure head 6, providing a negative pressure power source.

[0040] The working principle of the closed suction system with automatic drainage and liquid level alarm of the present invention is as follows.

[0041] First, during sputum suction, the drainage tube 15 is inserted into the patient's sputum area. The controller 27 is activated by pressing switch 8. Once switch 8 is turned on, the controller 27 activates the negative pressure fan 31, which generates negative pressure on the negative pressure hose 30. The negative pressure hose 30 generates negative pressure on the negative pressure head 6, which in turn generates negative pressure on the negative pressure tube 32. This creates negative pressure inside the collection container 33 through the drainage cover 1, causing the drainage tube 15 to draw sputum into the drainage head 3, from which infusion fluid is then introduced. Inside tube 2, the fluid enters the collection tank 33 through the inlet tube 2, and the drainage cover 1 is pressed onto the outer wall of the collection tank 33. The collection tank 33 is positioned and docked on the shell 29, so that the sputum can be collected inside the collection tank 33. At the same time, the infrared distance sensor 34 senses the liquid level of the sputum inside the collection tank 33. When the distance value sensed by the infrared distance sensor 34 is the alarm distance set by the controller 27, the alarm light 28 is turned on by the controller 27, realizing a closed sputum suction operation with automatic drainage and liquid level alarm.

[0042] Secondly, during the detection process of this invention, when switch 8 is pressed, the counting bar 25 needs to be pressed. The counting bar 25 squeezes switch 8, and the bottom end of the counting bar 25 is pressed against the pressure end of pressure sensor 26. This is counted as one time. At this time, controller 27 starts timing. By continuously pressing switch 8, the number of suctioning times started by each press of switch 8 can be counted. If switch 8 is pressed multiple times within the time set by controller 27 and the number of presses exceeds the number set by controller 27, then electric cylinder 11 is immediately activated by controller 27.

[0043] Then, when the present invention performs separation and coverage drive, the electric cylinder 11 pushes the linkage block 10 to move upward, the linkage block 10 drives the connecting block 9 to move upward, and the connecting block 9 drives the two limit bars 4 to move upward, the two limit bars 4 drive the drainage head 3 to move upward, and the drainage head 3 separates from the liquid inlet pipe 2.

[0044] Simultaneously, the upward movement of connecting block 9 will cause slide bar 12 to move vertically upward, slide bar 12 will cause protective block 5 to move vertically upward, and protective block 5 will move vertically upward along the outer wall of inlet tube 2. When the lower inclined surface of protective block 5 is higher than the upper surface of inlet tube 2, compression spring 13 is supported by connecting block 9. The contraction force of compression spring 13 will cause slide bar 12 to move to the left, and slide bar 12 will move to the left along the inner wall of connecting block 9. Slide bar 12 will cause protective block 5 to move to the left, and protective block 5 will cover the top part of inlet tube 2 to prevent it from being connected to inlet tube 2 again for use. At the same time, it will prevent other drainage heads 3 from being connected to inlet tube 2 for use, completely avoiding exceeding the set number of suctioning times and preventing inlet tube 2 from being reused.

[0045] Simultaneously, during the linkage process of this invention, when the connecting block 9 moves to the left, it synchronously drives the pull bar 16 to move to the left. The pull bar 16 drives the top of the pull rope 17 to pull upward, while the pull rope 17 slides along the inner wall of the L-shaped sleeve 18. The drainage cover 1 supports the L-shaped sleeve 18. In this way, the pull rope 17 drives the sleeve block 21 to move to the left. The sleeve block 21 is guided to move to the left along the outer wall of the guide rod 22 and along the inner wall of the support frame 23. In this way, the sleeve block 21 drives the sliding rod 19 to move to the left, and the sliding rod 19 drives the sleeve strip 20 to move to the left. The sliding rod 19 is guided to move to the left along the inner wall of the support frame 23, thereby the sleeve strip 20 drives the pressure strip 7 to move to the left. The linkage block 10 is moved and pressed onto the top of the negative pressure head 6 and tightened, thus tightening the negative pressure head 6. The negative pressure head 6 tightens the negative pressure tube 32, the negative pressure tube 32 tightens the drainage cover 1, and the drainage cover 1 tightens the collection container 33. Thus, the collection container 33 is positioned on the shell 29, preventing the collection container 33 from separating from the shell 29, preventing the negative pressure head 6 from being disassembled from the negative pressure tube 32, preventing the negative pressure head 6 from being connected to other collection containers 33, completely preventing exceeding the set number of suctioning attempts, preventing the reuse of the negative pressure head 6, and preventing violations or errors in operation. This greatly improves the safety of patient drainage and suctioning and reduces the risk of patient complications.

[0046] All contents not described in detail in the specification are existing technologies known to those skilled in the art, and the model parameters of each electrical appliance are not specifically limited; conventional equipment can be used. Electrical control components not mentioned in this technical solution are not shown in the figures because they are existing technologies, and will not be described here.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A closed suction system with automatic drainage and liquid level alarm, comprising a drainage cover (1), wherein the upper surface of the drainage cover (1) is connected to a liquid inlet pipe (2), characterized in that: A drain head (3) is inserted above the inlet pipe (2); The separator is located on the outer wall of the drain head (3), and multiple limiting strips (4) are installed on the separator. A cover is provided below the separator, and a protective block (5) is provided on the cover. The negative pressure head (6) is located above the drainage cover (1) and away from the inlet pipe (2); A linkage component is installed on the separation component, and a pressure strip (7) is installed on the linkage component. The detection unit is located on one side of the negative pressure head (6) and away from the drainage head (3), and the detection unit is equipped with a switch (8). When the detection unit detection switch (8) is pressed more than the set value within a specified time, the separation component will start multi-directional drive: first, drive multiple limit bars (4) to move vertically, so that the drainage head (3) is separated from the liquid inlet pipe (2); second, drive the cover component, drive the protective block (5) to move vertically until its lower inclined surface is higher than the top of the liquid inlet pipe (2), and then horizontally cover the top of the liquid inlet pipe (2); third, drive the linkage component to move horizontally, and the linkage component drives the pressure bar (7) to cover the top of the negative pressure head (6) for pressing.

2. The closed suction system with automatic drainage and liquid level alarm according to claim 1, characterized in that: The separating element includes: The connecting block (9) is fixed on the outer wall of the limiting strip (4). Both limiting strips (4) are slidably connected to the drain head (3). One end of the connecting block (9) is fixed with a linkage block (10). An electric cylinder (11) is installed on the lower surface of the linkage block (10). The output end of the electric cylinder (11) is used to push the linkage block (10) to move. The electric cylinder (11) is fixedly connected to the drain cover (1).

3. The closed suction system with automatic drainage and liquid level alarm according to claim 2, characterized in that: The top of the drainage head (3) is connected to a drainage tube (15), which is used to drain aspirated sputum.

4. The closed suction system with automatic drainage and liquid level alarm according to claim 3, characterized in that: The cover includes: The slide bar (12) slides on the inner wall of the connecting block (9). A compression spring (13) is installed on one side of the slide bar (12). The protective block (5) and the compression spring (13) are both fixedly connected to the slide bar (12). The support bar (14) is connected to one end of the compression spring (13). The connecting block (9) and the compression spring (13) are both fixedly connected to the support bar (14). The lower surface of the protective block (5) is set as an inclined surface.

5. The closed suction system with automatic drainage and liquid level alarm according to claim 4, characterized in that: The upper surface cross-sectional area of ​​the slide bar (12) is larger than the lower surface cross-sectional area, and the lower surface of the support bar (14) is arranged parallel to the upper surface of the protective block (5).

6. The closed suction system with automatic drainage and liquid level alarm according to claim 5, characterized in that: The linkage component includes: A pull bar (16) is fixed to one side of the connecting block (9), and a pull rope (17) with an L-shaped vertical cross section is fixed to the bottom end of the pull bar (16). L-shaped sleeve (18) slides on the outer wall of pull rope (17). The L-shaped sleeve (18) is used to guide the movement of pull rope (17). One end of pull rope (17) is fixed with sleeve block (21), and a slide rod (19) is installed on one side of sleeve block (21). A sleeve (20) is fixed to one end of a slide bar (19). The sleeve (20) is fixedly connected to the pressure strip (7). A guide rod (22) is installed on the inner wall of the sleeve block (21), and the guide rod (22) is used to guide the sleeve block (21) to slide. A support frame (23) is slidably connected to the outer wall of the sleeve block (21). The support frame (23) is fixedly connected to the drainage cover (1).

7. The closed suction system with automatic drainage and liquid level alarm according to claim 6, characterized in that: The slide rod (19) is slidably connected to the support frame (23), and the center point of the guide rod (22) is not at the same center point as the center point of the slide rod (19).

8. The closed suction system with automatic drainage and liquid level alarm according to claim 7, characterized in that: A support column (24) is fixed between the L-shaped sleeve (18) and the drainage cover (1), and the support column (24) is used to reinforce the L-shaped sleeve (18).

9. The closed suction system with automatic drainage and liquid level alarm according to claim 8, characterized in that: The detection unit includes: A counting bar (25) is fixed on a switch (8). A pressure sensor (26) is provided at the bottom of the counting bar (25). The pressure sensor (26) is used to sense the number of times the counting bar (25) is pressed. A controller (27) is fixed at the top of the pressure sensor (26). The electric cylinder (11) and the pressure sensor (26) are both electrically connected to the controller (27). The switch (8) is electrically connected to the controller (27).

10. The closed suction system with automatic drainage and liquid level alarm according to claim 9, characterized in that: A housing (29) is fixed to one side of the controller (27), and an alarm light (28) is installed on the upper surface of the housing (29) near the controller (27). The inner wall of the drainage cover (1) is threaded with a collection tank (33), which is inserted into the shell (29). An infrared distance sensor (34) is installed on the upper surface of the drainage cover (1) near its center point. The infrared distance sensor (34) is used to sense the liquid level of the sputum inside the collection tank (33). The infrared distance sensor (34) and the alarm light (28) are both electrically connected to the controller (27). The top of the negative pressure head (6) is connected to a negative pressure hose (30), the inner wall of the negative pressure head (6) is provided with a negative pressure pipe (32), the negative pressure pipe (32) is fixedly connected to the drainage cover (1), and a negative pressure fan (31) is installed at the bottom of the negative pressure hose (30).

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