Closed sputum suction tube dosing structure

Abstract

An adjusting device comprises a fixing assembly arranged at the right end of a sputum suction tube and used for being connected with the sputum suction tube, and an adjusting assembly used for controlling the adjusting assembly and a cleaning tube to communicate with the sputum suction tube is arranged in the fixing assembly. A limiting assembly used for limiting the adjusting assembly is arranged in the fixing assembly. Therefore, when medicine adding operation needs to be carried out, medical staff only need to inject medicine into the medicine adding connector, and then the inner core is rotated to enable the medicine adding connector to be communicated with the inner channel of the sputum suction tube. At the moment, the medicine is inhaled into the respiratory tract along with the sputum, so that accurate administration of the medicine is realized; through the double functions of precise dosing and negative pressure suction, the closed sputum suction tube dosing structure can improve the treatment effect; due to the adoption of the closed design, the sputum suction tube dosing structure can effectively avoid the risks of sputum leakage and cross infection.

Description

Technical Field

[0001] This application relates to the technical field of medical devices, and particularly to a drug addition structure for a closed suction catheter. Background Art

[0002] Closed suction catheters are commonly used medical devices. During the treatment of respiratory diseases, medical staff perform drug administration operations in the respiratory tract according to the needs of the condition.

[0003] The existing closed suction catheters are mainly used to aspirate the secretions in the airways of patients, especially those with endotracheal intubation, to keep the airways unobstructed; when drugs need to be added to the patient's respiratory tract, it is necessary to carry out drug addition to the respiratory tract through the drug addition structure on the closed suction catheter according to the action principles and methods of different drugs.

[0004] However, the existing suction catheters are single-hole suction pipes. To inject drugs, it is necessary to first disconnect the connection of the suction catheter and then connect the drug addition tube. This is likely to allow germs to overflow along the suction catheter, resulting in cross-infection; in addition, when injecting drugs, medical staff need to operate multiple instruments at the same time, which is prone to confusion and not convenient for quickly injecting drugs into the patient's respiratory tract. Summary of the Invention

[0005] This application aims to solve at least one of the technical problems in the related art to some extent.

[0006] To this end, an object of this application is to provide a drug addition structure for a closed suction catheter. When suction operation is required, medical staff only need to insert the closed suction catheter into the patient's trachea and turn on the negative pressure suction device. At this time, sputum will be sucked into the suction catheter.

[0007] When drug addition operation is required, medical staff only need to inject the drug into the drug addition interface and then rotate the inner core to connect the drug addition interface with the internal channel of the suction catheter. At this time, the drug will be sucked into the respiratory tract together with the sputum, realizing precise drug administration; through the dual effects of precise drug administration and negative pressure suction, this drug addition structure for a closed suction catheter can improve the treatment effect; due to the closed design, this drug addition structure for a suction catheter can effectively avoid the risk of sputum leakage and cross-infection.

[0008] To achieve the above object, an embodiment of the first aspect of the present application provides a medicine adding structure for a closed suction catheter, including a suction catheter. A regulating device for connecting with the suction catheter is arranged on the right side of the suction catheter. A medicine adding device for adding medicine is arranged on the front side of the regulating device. A cleaning tube for cleaning the suction catheter is arranged on the rear side of the regulating device. The medicine adding device includes a medicine adding component for adding medicine arranged on the front side of the regulating device. A control valve for controlling the liquid medicine flow rate in the medicine adding component is arranged on the tube body of the medicine adding component. In order to more precisely control the medicine adding amount and the suction flow rate, by adjusting the opening degree of the control valve, medical staff can flexibly adjust the medicine adding speed and the suction negative pressure magnitude. The regulating device includes a fixing component arranged at the right end of the suction catheter for connecting with the suction catheter. An adjusting component for controlling the communication between the regulating component and the cleaning tube and the suction catheter is arranged in the fixing component. A limiting component for restricting the adjusting component is arranged in the fixing component.

[0009] For a medicine adding structure of a closed suction catheter according to an embodiment of the present application, when performing a suction operation, medical staff only need to insert the closed suction catheter into the patient's trachea and turn on the negative pressure suction device. At this time, sputum will be sucked into the suction catheter.

[0010] When performing a medicine adding operation, medical staff only need to inject the medicine into the medicine adding interface and then rotate the inner core to connect the medicine adding interface with the internal channel of the suction catheter. At this time, the medicine will be sucked into the respiratory tract together with the sputum, realizing precise medicine administration. Through the dual effects of precise medicine administration and negative pressure suction, this medicine adding structure of the closed suction catheter can improve the treatment effect. Due to the closed design, this medicine adding structure of the suction catheter can effectively avoid the risk of sputum leakage and cross-infection.

[0011] In addition, a medicine adding structure of a closed suction catheter according to the above-mentioned present application may further have the following additional technical features: In an embodiment of the present application, a connecting tube for connecting with the fixing component is fixedly installed at the right end of the suction catheter. An air insertion interface tube for connecting with the ventilator pipeline is arranged at the left end of the suction catheter. Therefore, when it is necessary to insert the suction catheter into the patient's oral cavity for suction, the air insertion interface tube at the patient end can be connected to the tracheal intubation, and the pipeline interface at the patient end can be connected to the ventilator pipeline to keep it unobstructed for the convenience of using the suction catheter. A color code card can be pasted on the product surface to manually mark the replacement date to remind medical staff of the use time of the disposable suction catheter.

[0012] In an embodiment of the present application, a flexible tube is provided at the bottom end of the suction tube, and a suction valve for connecting to the negative pressure source pipeline is provided at the bottom end of the flexible tube. The negative pressure source pipeline can be adjusted according to the age of the patient during design; therefore, it is recommended that the suction negative pressure for newborns and children be below 120 mmHg, and the suction negative pressure for adults be below 200 mmHg, so as to control the use of the suction tube; therefore, when using the suction tube, set the push button of the suction valve in the locked position; then slowly push the suction tube into the endotracheal tube to the required scale, set the push button of the suction valve in the open position, turn on the suction, and then gently withdraw the suction tube while pressing the suction valve; when there is sputum, the tube can be stopped, and after the sputum is sucked out, continue to pull the tube until it is flattened. Each suction should not exceed 15 seconds; when pulling the suction tube out of the patient's mouth; when seeing the black long square on the tube, stop pulling.

[0013] In an embodiment of the present application, the medicine adding component includes a medicine adding tube provided in front of the fixing component for adding medicine, and a control valve is located on the tube body of the medicine adding tube. A soft plug for sealing the medicine adding tube is provided in front of the medicine adding tube, and the soft plug is connected to the medicine adding tube; therefore, when adding medicine to the patient, the soft plug sealing the medicine adding tube can be removed, and then the medicine is added to the patient along the medicine adding tube by means of hanging the medicine.

[0014] In an embodiment of the present application, the fixing component includes a fixing housing fixedly installed at the right end of the connecting tube. A circular ring groove is opened at the top end of the fixing housing, and a first locking hole for locking the adjusting component is opened at the bottom of the circular ring groove, and there are two first locking holes.

[0015] In an embodiment of the present application, the adjusting component includes a channel tube provided in the fixing housing for controlling the connection of the connecting tube, the cleaning tube, and the medicine adding tube. The channel tube belongs to a double channel to facilitate the connection of the connecting tube with the cleaning tube and the medicine adding tube by using the double channel tube; a rotating shaft for driving the channel tube to rotate is fixedly installed at the top end of the channel tube, and the upper and lower ends of the rotating shaft are connected to the housing of the fixing housing through bearings to facilitate the rotation of the rotating shaft; a knob for driving the rotating shaft to rotate is fixedly installed at the top end of the rotating shaft.

[0016] In an embodiment of the present application, a first limiting plate for cooperating with the limiting component to limit the rotating shaft is provided on the rod body of the rotating shaft. A second locking hole is opened at the top end of the first limiting plate, and a rounded corner is opened at the edge of the second locking hole.

[0017] In one embodiment of the present application, a locking rod for inserting into the first locking hole to lock the knob is provided inside the knob, and the diameter of the locking rod is the same as the aperture of the first locking hole, so as to facilitate inserting the locking rod into the first locking hole to lock the knob; a second limiting plate for preventing the locking rod from detaching from the knob is provided on the rod body of the locking rod, a pull cover for driving the locking rod to move up and down is fixedly installed at the top end of the locking rod, and a handle is fixedly installed at the top end of the pull cover, so as to facilitate driving the pull cover to move upward by using the handle, and then the locking rod can be moved upward from the first locking hole to release the restriction on the knob; a first spring for resetting the locking rod is sleeved on the rod body of the locking rod, and the first spring is located above the second limiting plate.

[0018] In one embodiment of the present application, the limiting component includes a limiting block fixedly installed inside the fixed housing, a limiting groove for cooperating with the first limiting plate is formed on the block body of the limiting block, and the limiting groove can cooperate with the first limiting plate to limit the rotating shaft.

[0019] In one embodiment of the present application, a round rod for inserting into the second locking hole is provided inside the block body of the limiting block, and the diameter of the round rod is the same as the aperture of the second locking hole; so as to facilitate inserting the round rod into the second locking hole to limit the first limiting plate, and the rounded corner at the edge of the second locking hole can cooperate with the round rod so that the round rod will not be stuck in the second locking hole; a third limiting plate for preventing the round rod from detaching from the limiting block is fixedly installed at the top end of the round rod, and a second spring for driving the third limiting plate to move up and down is fixedly installed at the top end of the third limiting plate.

[0020] Compared with the prior art, the beneficial effects of the present application are as follows: When performing sputum suction operation, medical staff only need to insert the closed sputum suction tube into the patient's trachea and turn on the negative pressure suction device. At this time, sputum will be sucked into the sputum suction tube.

[0021] When performing drug addition operation, medical staff only need to inject the drug into the drug addition interface, and then rotate the inner core to connect the drug addition interface with the internal channel of the sputum suction tube. At this time, the drug will be sucked into the respiratory tract together with the sputum to achieve precise drug delivery; through the dual effects of precise drug delivery and negative pressure suction, this drug addition structure of the closed sputum suction tube can improve the treatment effect; due to the closed design, this drug addition structure of the sputum suction tube can effectively avoid the risk of sputum leakage and cross-infection.

[0022] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where: Figure 1 FIG. 3 is an overall structural schematic diagram of a medicine adding structure of a closed suction catheter according to an embodiment of the present application; Figure 2 FIG. 4 is a front view of the suction catheter of the medicine adding structure of a closed suction catheter according to an embodiment of the present application; Figure 3 FIG. 5 is a structural schematic diagram of a medicine adding device of the medicine adding structure of a closed suction catheter according to an embodiment of the present application; Figure 4 FIG. 6 is a structural schematic diagram of an adjusting device of the medicine adding structure of a closed suction catheter according to an embodiment of the present application; Figure 5 FIG. 7 is a sectional view of a fixed housing of the medicine adding structure of a closed suction catheter according to an embodiment of the present application; Figure 6 FIG. 8 is a sectional view of the medicine adding structure of a closed suction catheter according to an embodiment of the present application Figure 5 and an enlarged view of part A; Figure 7 FIG. 9 is a sectional view of the medicine adding structure of a closed suction catheter according to an embodiment of the present application Figure 5 and an enlarged view of part B; Figure 8 FIG. 10 is a sectional view of the medicine adding structure of a closed suction catheter according to an embodiment of the present application Figure 5 and an enlarged view of part C.

[0024] As shown in the figure: 100, suction catheter; 101, air insertion interface tube; 102, connecting tube; 103, flexible tube; 104, suction valve; 200, medicine adding device; 210, medicine adding assembly; 211, medicine adding tube; 212, soft plug; 220, control valve; 300, adjusting device; 310, fixing assembly; 311, fixing housing; 312, circular groove; 313, locking hole 1; 320, adjusting assembly; 321, knob; 322, rotating shaft; 323, channel tube; 324, limiting plate 1; 325, locking hole 2; 326, pull cover; 327, locking rod; 328, limiting plate 2; 329, spring 1; 330, limiting assembly; 331, limiting block; 332, limiting groove; 333, round rod; 334, limiting plate 3; 335, spring 2; 400, cleaning tube. Detailed Embodiments

[0025] Embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation to the present application.

[0026] A drug adding structure for a closed suction catheter of the present application will be described below in conjunction with the accompanying drawings.

[0027] As Figures 1 - 8 shown, a drug adding structure for a closed suction catheter of an embodiment of the present application may include a suction catheter 100. A regulating device 300 for connecting with the suction catheter 100 is provided on the right side of the suction catheter 100. A drug adding device 200 for adding drugs is provided on the front side of the regulating device 300. A cleaning tube 400 for cleaning the suction catheter 100 is provided on the rear side of the regulating device 300. The drug adding device 200 includes a drug adding assembly 210 provided on the front side of the regulating device 300 for adding drugs. A control valve 220 for controlling the liquid medicine flow rate in the drug adding assembly 210 is provided on the tube body of the drug adding assembly 210. The regulating device 300 includes a fixing assembly 310 provided at the right end of the suction catheter 100 for connecting with the suction catheter 100. An adjusting assembly 320 for controlling the communication between the adjusting assembly 320 and the cleaning tube 400 and the suction catheter 100 is provided in the fixing assembly 310. A limiting assembly 330 for limiting the adjusting assembly 320 is provided in the fixing assembly 310.

[0028] In an embodiment of the present application, as Figure 2 and Figure 3 shown, a connecting tube 102 for connecting with the fixing assembly 310 is fixedly installed at the right end of the suction catheter 100. An air insertion interface tube 101 for connecting with the ventilator pipeline is provided at the left end of the suction catheter 100. Therefore, when it is necessary to insert the suction catheter 100 into the patient's oral cavity for suction, the air insertion interface tube 101 at the patient end can be connected to the tracheal intubation, and the pipeline interface at the patient end is connected to the ventilator pipeline to keep it unobstructed for the convenience of using the suction catheter 100. Among them, a color code card can be pasted on the product surface and the replacement date can be marked by hand to remind the medical staff of the usage time of the disposable suction catheter 100.

[0029] Further, a flexible tube 103 is provided at the bottom end of the sputum suction tube 100, and a suction tube is arranged inside the flexible tube 103; a suction valve 104 for connecting to the negative pressure source pipeline is provided at the bottom end of the flexible tube 103, and the negative pressure source pipeline can be adjusted according to the age of the patient during design; therefore, it is recommended that the sputum suction negative pressure for newborns and children be below 120 mmHg, and the sputum suction negative pressure for adults be below 200 mmHg, so the use of the sputum suction tube 100 can be controlled; therefore, when using the sputum suction tube 100, set the push button of the suction valve 104 to the locked position; then slowly push the sputum suction tube 100 into the tracheal intubation to the required scale, set the push button of the suction valve 104 to the open position, turn on the suction, and then gently withdraw the suction tube while pressing the suction valve 104; when there is sputum, the tube can be stopped, and continue to pull the tube until it is flattened after the sputum is suctioned out, and each sputum suction does not exceed 15S; when pulling out the sputum suction tube 100 from the patient's mouth; stop pulling when seeing the black long square on the tube.

[0030] In an embodiment of the present application, as Figure 4 shown, the medicine adding assembly 210 includes a medicine adding tube 211 provided on the front side of the fixing assembly 310 for adding medicine, and a control valve 220 is located on the tube body opposite to the medicine adding tube 211. In order to more precisely control the amount of medicine added and the suction flow rate, by adjusting the opening degree of the control valve 220, medical staff can flexibly adjust the medicine adding speed and the sputum suction negative pressure; a soft plug 212 for sealing the medicine adding tube 211 is provided on the front side of the medicine adding tube 211, and the soft plug 212 is connected to the medicine adding tube 211; therefore, when medicine needs to be added to the patient, the soft plug 212 sealing the medicine adding tube 211 can be removed, and the medicine can be added to the patient along the medicine adding tube 211 by means of hanging the medicine.

[0031] In an embodiment of the present application, as Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, the fixing assembly 310 includes a fixing outer shell 311 fixedly installed at the right end of the connecting tube 102. A circular ring groove 312 is opened at the top end of the fixing outer shell 311, and a locking hole one 313 for locking the adjusting assembly 320 is opened at the bottom of the circular ring groove 312, and there are two locking holes one 313.

[0032] Further, the adjusting assembly 320 includes a channel pipe 323 disposed within the fixed housing 311 for controlling the connection between the connecting pipe 102, the cleaning pipe 400, and the medicine adding pipe 211. The channel pipe 323 is a dual-channel pipe, facilitating the connection of the connecting pipe 102 to the cleaning pipe 400 and the medicine adding pipe 211 through the dual-channel pipe 323. Therefore, when adding medicine to the patient and cleaning the suction tube 100, the adjusting assembly 320 can be used to control the channel pipe 323 to connect the connecting pipe 102 to the cleaning pipe 400. A rotating shaft 322 for driving the rotation of the channel pipe 323 is fixedly installed at the top end of the channel pipe 323, and the upper and lower ends of the rotating shaft 322 are connected to the housing of the fixed housing 311 through bearings to facilitate the rotation of the rotating shaft 322. A knob 321 for driving the rotation of the rotating shaft 322 is fixedly installed at the top end of the rotating shaft 322.

[0033] Further, a first limiting plate 324 for cooperating with the limiting assembly 330 to limit the rotating shaft 322 is provided on the rod body of the rotating shaft 322. A second locking hole 325 is formed at the top end of the first limiting plate 324, and a fillet is formed at the edge of the second locking hole 325.

[0034] Further, a locking rod 327 for inserting into the first locking hole 313 to lock the knob 321 is provided within the knob 321. The diameter of the locking rod 327 is the same as the aperture of the first locking hole 313, facilitating the insertion of the locking rod 327 into the first locking hole 313 to lock the knob 321. A second limiting plate 328 for preventing the locking rod 327 from detaching from the knob 321 is provided on the rod body of the locking rod 327. A pull cover 326 for driving the up and down movement of the locking rod 327 is fixedly installed at the top end of the locking rod 327, and a handle is fixedly installed at the top end of the pull cover 326 to facilitate the use of the handle to drive the pull cover 326 to move upward, enabling the locking rod 327 to move upward from the first locking hole 313 to release the restriction on the knob 321. A first spring 329 for resetting the locking rod 327 is sleeved on the rod body of the locking rod 327, and the first spring 329 is located above the second limiting plate 328. Therefore, when adding medicine to the patient's respiratory tract using the suction tube 100, the handle can be used to control the pull cover 326 to move the locking rod 327 upward, enabling the locking rod 327 to be removed from the first locking hole 313. Then, by rotating the knob 321 to control the rotation of the rotating shaft 322, the medicine adding pipe 211 can be connected to the connecting pipe 102 through the channel pipe 323. Next, the soft plug 212 sealing the medicine adding pipe 211 is removed, and the medicine is added to the patient through the medicine adding pipe 211 in a drip manner. At this time, the medicine will be inhaled into the respiratory tract together with the sputum, achieving precise drug administration.

[0035] Furthermore, the limiting assembly 330 includes a limiting block 331 fixedly installed in the fixed housing 311 , and a limiting groove 332 for cooperating with the limiting plate 1 324 is opened on the block body of the limiting block 331 , and the limiting groove 332 can cooperate with the limiting plate 1 324 to limit the rotating shaft 322 .

[0036] The limiting block 331 is provided with a round rod 333 for inserting into the locking hole 225; the top of the round rod 333 is fixedly installed with a limiting plate 334 for preventing the round rod 333 from escaping from the limiting block 331, and the top of the limiting plate 334 is fixedly installed with a spring 235 for driving the limiting plate 334 to move up and down; therefore, when it is necessary to facilitate the suction tube 100 to add medicine to the patient's respiratory tract, the locking rod 327 can be moved upward by controlling the pull cover 326 by the handle, so that the locking rod 327 can be controlled to be taken out of the locking hole 1 313, and then the knob 321 is rotated to control the rotation shaft 322 to rotate, so that the dosing tube 211 can be connected to the connecting tube 102 through the channel tube 323; at this time, the limiting plate 334 rotates around the rotation shaft 322, and Under the elastic action of the locking hole 2325 of the limiting plate 334 and the spring 2335 in the limiting plate 334, the round rod 333 can be driven to insert into the locking hole 2325, so as to limit the channel tube 323; and when the suction tube 100 needs to be cleaned, the handle controls the pull cover 326 to move the locking rod 327 upward, so as to control the locking rod 327 to be taken out of the locking hole 1 313, and then the knob 321 is rotated to control the rotation shaft 322 to rotate, so that the cleaning tube 400 and the connecting tube 102 can be connected through the channel tube 323, and the suction tube 100 can be cleaned. Therefore, the fully enclosed design can reduce the exposure risk by 80% compared with the traditional operation; therefore, it can prevent the pathogens from overflowing along the suction tube 100 and avoid cross infection.

[0037] In summary, for the medicine adding structure of the closed suction tube in the embodiments of the present application, when it is necessary to add medicine to the patient's respiratory tract through the suction tube 100, the handle can be used to control the pull cover 326 to move the locking rod 327 upward, so as to control the locking rod 327 to be taken out of the first locking hole 313. Then, by rotating the knob 321 to control the rotation of the rotating shaft 322, the medicine adding tube 211 can be communicated with the connecting tube 102 through the channel tube 323. At this time, the third limiting plate 334 rotates around the rotating shaft 322. Under the elastic action of the second locking hole 325 of the third limiting plate 334 and the second spring 335 in the third limiting plate 334, the round rod 333 can be driven to insert into the second locking hole 325, so as to realize the limitation of the channel tube 323. When it is necessary to clean the suction tube 100, the handle is used to control the pull cover 326 to move the locking rod 327 upward, so as to control the locking rod 327 to be taken out of the first locking hole 313. Then, by rotating the knob 321 to control the rotation of the rotating shaft 322, the cleaning tube 400 can be communicated with the connecting tube 102 through the channel tube 323, so as to clean the suction tube 100. Therefore, through the fully enclosed design, the exposure risk can be reduced by 80% compared with the traditional operation. Therefore, it is possible to prevent germs from overflowing along the suction tube 100, thereby avoiding cross-infection.

[0038] In the description of this specification, the terms "first" and "second" are only used for descriptive purposes, and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0039] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0040] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present application.

Claims

1. A drug addition structure for a closed suction catheter, characterized in that It includes a sputum suction tube (100). A regulating device (300) for connecting with the sputum suction tube (100) is arranged on the right side of the sputum suction tube (100). A medicine adding device (200) for adding medicine is arranged on the front side of the regulating device (300). A cleaning tube (400) for cleaning the sputum suction tube (100) is arranged on the rear side of the regulating device (300); The medicine adding device (200) includes a medicine adding component (210) arranged on the front side of the regulating device (300) for adding medicine. A control valve (220) for controlling the liquid medicine flow rate in the medicine adding component (210) is arranged on the tube body of the medicine adding component (210); The regulating device (300) includes a fixing component (310) arranged at the right end of the sputum suction tube (100) for connecting with the sputum suction tube (100). An adjusting component (320) for controlling the communication between the adjusting component (320) and the cleaning tube (400) and the sputum suction tube (100) is arranged in the fixing component (310). A limiting component (330) for restricting the adjusting component (320) is arranged in the fixing component (310).

2. The dosing structure of a closed suction catheter according to claim 1, characterized in that, A connecting tube (102) for connecting with the fixing component (310) is fixedly installed at the right end of the sputum suction tube (100). An air insertion interface tube (101) for connecting with the ventilator pipeline is arranged at the left end of the sputum suction tube (100).

3. The drug addition structure of a closed suction catheter according to claim 2, characterized in that, A flexible tube (103) is arranged at the bottom end of the sputum suction tube (100). A suction valve (104) for connecting with the negative pressure source pipeline is arranged at the bottom end of the flexible tube (103).

4. The dosing structure of a closed suction catheter according to claim 1, characterized in that, The medicine adding component (210) includes a medicine adding tube (211) arranged on the front side of the fixing component (310) for adding medicine. The control valve (220) is located on the tube body of the medicine adding tube (211). A soft plug (212) for sealing the medicine adding tube (211) is arranged on the front side of the medicine adding tube (211).

5. The dosing structure of a closed suction catheter according to claim 2, characterized in that, The fixing component (310) includes a fixing outer shell (311) fixedly installed at the right end of the connecting tube (102). A circular ring groove (312) is opened at the top end of the fixing outer shell (311). A first locking hole (313) for locking the adjusting component (320) is opened at the bottom of the circular ring groove (312), and there are two first locking holes (313).

6. The dosing structure of a closed suction catheter according to claim 5, characterized in that, The adjusting component (320) includes a channel tube (323) arranged in the fixing outer shell (311) for controlling the communication between the connecting tube (102), the cleaning tube (400) and the medicine adding tube (211). A rotating shaft (322) for driving the channel tube (323) to rotate is fixedly installed at the top end of the channel tube (323). A knob (321) for driving the rotating shaft (322) to rotate is fixedly installed at the top end of the rotating shaft (322).

7. The drug addition structure of a closed suction catheter according to claim 6, characterized in that, A first limiting plate (324) for cooperating with the limiting component (330) to restrict the rotating shaft (322) is arranged on the rod body of the rotating shaft (322). A second locking hole (325) is opened at the top end of the first limiting plate (324).

8. The dosing structure of a closed suction catheter according to claim 7, characterized in that A locking rod (327) for inserting into the first locking hole (313) to lock the knob (321) is arranged inside the knob (321). A second limiting plate (328) for preventing the locking rod (327) from detaching from the restriction of the knob (321) is arranged on the rod body of the locking rod (327). A pull cover (326) for driving the locking rod (327) to move up and down is fixedly installed at the top end of the locking rod (327). A first spring (329) for resetting the locking rod (327) is sleeved on the rod body of the locking rod (327), and the first spring (329) is located above the second limiting plate (328).

9. The dosing structure of a closed suction catheter according to claim 7, characterized in that, The limiting component (330) includes a limiting block (331) fixedly installed inside the fixed outer shell (311). A limiting groove (332) for cooperating with the first limiting plate (324) is formed in the block body of the limiting block (331).

10. The dosing structure of a closed suction catheter according to claim 9, characterized in that, A round rod (333) for inserting into the second locking hole (325) is arranged inside the block body of the limiting block (331). A third limiting plate (334) for preventing the round rod (333) from detaching from the restriction of the limiting block (331) is fixedly installed at the top end of the round rod (333). A second spring (335) for driving the third limiting plate (334) to move up and down is fixedly installed at the top end of the third limiting plate (334).

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