Closed sputum suction tube

Abstract

The application discloses a closed sputum suction tube and relates to the technical field of medical equipment. The closed sputum suction tube comprises an outer hose, a sputum suction catheter is penetrated through the inner wall of the outer hose, a shunt pipe is fixedly installed at the end of the outer hose, the inner part of the outer hose is respectively provided with a first channel, a second channel and a third channel, a double-layer air bag in communication with the first channel is installed on one side of the shunt pipe, an injection pipe in communication with the third channel is installed on the other side of the shunt pipe, the injection pipe can work alternately with the double-layer air bag, waste liquid is recovered through the double-layer air bag connected with the first channel, flushing liquid is quantitatively delivered through the third channel, thick sputum liquid is diluted, the sputum suction catheter is guided to move through the second channel, the three channels are integrally designed, synchronous and efficient operation of sputum suction, flushing and ventilation is realized, the double-layer air bag and the injection pipe are matched, sputum suction and flushing work are alternately performed, the sputum suction catheter is regularly extruded through cooperation of a valve plate, blockage is prevented and discharge is promoted, and the sputum suction efficiency is remarkably improved.

Description

A closed suction tube Technical Field

[0001] This invention relates to the field of medical device technology, specifically to a closed suction tube. Background Technology

[0002] In clinical medical care, for patients in intensive care, postoperative recovery, coma, tracheotomy, or with swallowing dysfunction, secretions such as saliva and sputum easily accumulate in the mouth and respiratory tract due to their weakened or lost ability to clear sputum. If not cleared in time, it can not only cause airway obstruction and lung infection, but may also induce serious complications such as aspiration pneumonia. Therefore, sputum suction is a key part of the basic care for such patients.

[0003] Among them, the closed suction catheter is a medical device used to clear airway secretions in patients with endotracheal intubation or tracheotomy. It can complete the suctioning operation without interrupting mechanical ventilation and oxygen supply, thereby reducing the potential risks of traditional open suctioning.

[0004] The outer layer is usually a transparent flexible cannula, with one end connected to the ventilator circuit interface and the other end connected to the patient's airway to form a closed channel. The inner layer is fitted with a movable suction catheter, with one end connected to a negative pressure suction device and the other end having a suction port, allowing suctioning to be performed through the cannula.

[0005] Currently, after suctioning, existing closed suction catheters leave sputum residue on the inner wall, especially viscous sputum, which is difficult to expel. If not rinsed, the residue may dry and crust, causing catheter blockage or bacterial growth. Existing closed suction catheters can only inject rinsing fluid through a single rinsing port after suctioning, which cannot simultaneously dilute the viscous sputum in the airway. Sputum easily adheres to the inner wall of the suction catheter tip and the airway mucosa, requiring repeated suctioning to clean it, which increases the risk of airway mucosal damage and reduces operational efficiency.

[0006] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing closed suction tubes. Summary of the Invention

[0007] The present invention addresses the problem that existing technical solutions are too simplistic and provides a solution that is significantly different from existing technologies. Specifically, the purpose of the present invention is to provide a closed suction tube to solve the problem mentioned in the background art that existing closed suction tubes cannot simultaneously perform suctioning and flushing operations, resulting in reduced suctioning efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a closed suction catheter, comprising an outer flexible tube, wherein a suction catheter is inserted through the inner wall of the outer flexible tube, and a shunt tube is fixedly installed at the end of the outer flexible tube, and the inner surface of the outer flexible tube is provided with a first channel, a second channel and a third channel respectively;

[0009] A double-layered airbag connected to the first channel is installed on one side of the shunt tube, and an injection tube connected to the third channel is installed on the other side of the shunt tube. The injection tube can work alternately with the double-layered airbag to deliver a quantitative amount of flushing fluid to the front end of the suction catheter through the injection tube. After flushing, the residual liquid is recovered through the first channel and the double-layered airbag.

[0010] The front end of the outer tubing is fixedly connected to a tracheal connector. A liquid guiding mechanism is installed inside the tracheal connector. The liquid guiding mechanism is used to guide the flushing fluid in and the discharge of residual liquid, and at the same time to center the front end of the suction catheter.

[0011] Preferably, a first flow guide sleeve is fixedly connected inside the shunt tube, and the first flow guide sleeve divides the inside of the shunt tube into two symmetrical chambers. A left branch tube is fixedly connected to one side of the shunt tube, and a right branch tube is fixedly connected to the other side of the shunt tube. A ventilator connector is inserted into one side of the shunt tube.

[0012] The chamber on the left is connected to the double-layered airbag via a left branch tube, and the chamber on the right is connected to the injection tube via a right branch tube. The ventilator connector is connected to the first flow guide sleeve.

[0013] Preferably, the double-layer airbag is divided into an outer airbag and an inner airbag. The front end of the inner airbag is connected to a connecting pipe that communicates with the left branch pipe, and the end of the inner airbag is connected to a waste liquid pipe, with a waste liquid collection cylinder threaded to the bottom of the waste liquid pipe.

[0014] Preferably, a one-way valve is installed on both the connecting pipe and the waste liquid pipe, and an air guide tube is inserted into the end of the outer airbag.

[0015] Preferably, a piston plate is slidably connected inside the injection tube, the piston plate dividing the inside of the injection tube into a liquid chamber and a gas chamber, a piston rod is fixedly connected to one side of the piston plate, and a return spring is sleeved on the surface of the piston rod.

[0016] Preferably, one end of the gas delivery tube is connected to the gas chamber of the injection tube, the front end of the injection tube is provided with a drain tube and an inlet tube, and both the drain tube and the inlet tube are equipped with a one-way valve. The drain tube is connected to the right branch tube, and the inlet tube is connected to a medicine bottle through a drainage tube.

[0017] Preferably, the liquid guiding mechanism includes a sleeve fixedly connected to the inner wall of the tracheal connector, a guide plate is sleeved on the outer surface of the sleeve, and a second guide sleeve is fixedly connected inside the sleeve, and the second guide sleeve divides the inside of the sleeve into two left-right symmetrical drainage channels, and the bottoms of the two drainage channels are connected to each other.

[0018] The drainage channel on the left is connected to the first channel, and the drainage channel on the right is connected to the third channel. Two circular openings are provided on both sides of the sleeve, and several permeation grooves with equal angles are opened on the surface of the guide plate.

[0019] Preferably, the bottom of the second flow guide sleeve is fixedly connected to two symmetrical valve plates, and the outer walls of the valve plates are respectively fixedly connected to two balloons. One side of the balloons is fixedly connected to the inner wall of the tracheal connector, and the top of each balloon is connected to the inside of the second flow guide sleeve through a hose.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] By dividing the inner part of the outer tube into three channels, the first channel is connected to the double-layered cuff and is used to absorb residual flushing fluid and sputum. The second channel assists in inserting the suction catheter into the trachea and guides the suction catheter. The third channel is connected to the injection tube for quantitative delivery of flushing fluid. During the suctioning operation, the alternating work of the double-layered cuff and the injection tube can ensure that suctioning and flushing are carried out simultaneously, which can effectively dilute viscous sputum, making it easier to be suctioned out and improving suctioning efficiency.

[0022] Furthermore, by alternating between the double-layered balloon and the injection tube, not only can suction and flushing be completed continuously and effectively, but the efficiency and safety of the entire process can also be guaranteed. The air tube connects the gas chambers of the double-layered balloon and the injection tube. When the double-layered balloon is squeezed flat, the waste fluid of the inner balloon is collected directly from the waste fluid tube into the waste fluid collection cylinder, while the gas of the outer balloon enters the gas chamber of the injection tube through the air tube, pushing the piston plate forward and squeezing out a metered amount of flushing fluid to dilute the viscous sputum in the dilution channel. When the double-layered balloon is released, the inner balloon also begins to elastically reset, generating negative pressure suction. This negative pressure suction acts on the first channel, collecting the remaining flushing fluid and sputum at the tip of the suction catheter back into the inner balloon, effectively preventing fluid backflow and reducing the risk of infection for the patient.

[0023] Furthermore, a liquid diversion mechanism is added to the front end of the suction tubing. The second diversion sleeve of the liquid diversion mechanism divides the inside of the tube into an independent waste liquid recovery chamber and a right-side flushing fluid delivery chamber. The waste liquid recovery chamber is connected to the first channel, and the flushing fluid delivery chamber is connected to the third channel. With the uniform distribution of the diversion plate, the flushing fluid can be evenly distributed and dilute the sputum. The elastic reset of the double-layer airbag not only provides a negative pressure source for secondary suction of residual liquid, but also realizes automatic quantitative supply of flushing fluid through the linkage of the air tube with the injection tube piston plate.

[0024] In addition, a valve plate and a balloon are added to the bottom of the second guide sleeve. As the double-layered balloon expands and contracts periodically, negative pressure is generated intermittently in the first channel. The negative pressure suction can directly draw out the fluid in the balloon. The volume of the balloon changes accordingly, which regularly squeezes the valve plate and further regularly squeezes the suction catheter. This effectively prevents the blockage caused by the accumulation of sputum. It not only promotes the smooth flow of sputum, but also centers the suction catheter, ensuring that the suction catheter is always in the best working position and improving the suction effect. Attached Figure Description

[0025] Figure 1 is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 is a schematic cross-sectional view of the double-layer airbag structure of the present invention.

[0027] Figure 3 is a schematic cross-sectional view of the injection tube of the present invention.

[0028] Figure 4 is a schematic diagram of the connection structure between the first flow guide sleeve and the ventilator connector of the present invention.

[0029] Figure 5 is a schematic diagram of the structure after the first guide sleeve and the second channel of the present invention are separated.

[0030] Figure 6 is a schematic diagram of the connection structure between the outer tube and the suction catheter of the present invention.

[0031] Figure 7 is a schematic diagram of the connection structure between the first flow guide sleeve and the ventilator connector of the present invention.

[0032] Figure 8 is a schematic diagram of the exploded structure of the liquid guiding mechanism of the present invention.

[0033] Figure 9 is a schematic diagram comparing the front view and cross-sectional view of the second guide sleeve and the sleeve of the present invention.

[0034] In the diagram: 1. Outer tubing; 101. First channel; 102. Second channel; 103. Third channel; 2. Suction catheter; 3. Shunt tube; 301. First guide sleeve; 302. Left branch tube; 303. Right branch tube; 304. Ventilator connector; 4. Double-layer cuff; 401. Outer cuff; 402. Inner cuff; 403. Connecting tube; 404. Waste fluid tube; 405. Waste fluid collection container; 5. Injection tube; 501. Piston plate; 502. Liquid chamber; 503. Gas chamber; 504. Piston rod; 505. Return spring; 6. Liquid diversion mechanism; 601. Sleeve; 602. Diversion disc; 603. Second guide sleeve; 604. Valve plate; 605. Balloon; 7. Tracheal connector; 8. Airway. Detailed Implementation

[0035] 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.

[0036] Please refer to Figures 1 to 9. The present invention provides a technical solution: a closed suction tube, including an outer tube 1, a suction catheter 2 penetrating the inner wall of the outer tube 1, a diversion tube 3 fixedly installed at the end of the outer tube 1, and a first channel 101, a second channel 102 and a third channel 103 respectively provided inside the outer tube 1.

[0037] A double-layered airbag 4 connected to the first channel 101 is installed on one side of the shunt tube 3, and an injection tube 5 connected to the third channel 103 is installed on the other side of the shunt tube 3. The injection tube 5 can work alternately with the double-layered airbag 4 to deliver a quantitative amount of flushing fluid to the front end of the suction catheter 2 through the injection tube 5. After flushing, the residual liquid is recovered through the first channel 101 and the double-layered airbag 4.

[0038] The front end of the outer tube 1 is fixedly connected to the tracheal connector 7. The tracheal connector 7 is equipped with a liquid diversion mechanism 6. The liquid diversion mechanism 6 is used to guide the flushing fluid in and the discharge of residual liquid, and at the same time, it centers the front end of the suction catheter 2.

[0039] By dividing the inner part of the outer tube 1 into three channels, the first channel 101 is connected to the double-layered cuff 4 and is used to absorb residual flushing fluid and sputum. The second channel 102 assists the suction catheter 2 in being inserted into the trachea and guides the suction catheter 2. The second channel 102 is connected to the injection tube 5 and is used to deliver a quantitative amount of flushing fluid. During the suctioning operation, the alternating work of the double-layered cuff 4 and the injection tube 5 can ensure that suctioning and flushing are carried out simultaneously, which can effectively dilute viscous sputum, making it easier to be suctioned out and improving suctioning efficiency.

[0040] In addition, the double-layered airbag 4 can prevent liquid from flowing back into the airway when recovering residual liquid, reducing the risk of infection. This design means that medical staff do not need to frequently change the suction tube or perform additional flushing operations during sputum suction, reducing operation time and patient discomfort. The independent design of the three channels ensures that each function does not interfere with the others, guaranteeing the smoothness of the sputum suction and flushing process.

[0041] In this embodiment, as shown in Figures 4, 5 and 6, a first guide sleeve 301 is fixedly connected inside the shunt tube 3, and the first guide sleeve 301 divides the inside of the shunt tube 3 into two symmetrical chambers. A left branch tube 302 is fixedly connected to one side of the shunt tube 3, and a right branch tube 303 is fixedly connected to the other side of the shunt tube 3. A ventilator connector 304 is inserted into one side of the shunt tube 3.

[0042] The chamber on the left is connected to the double-layered air bag 4 via the left branch tube 302, the chamber on the right is connected to the injection tube 5 via the right branch tube 303, and the ventilator connector 304 is connected to the first flow guide sleeve 301.

[0043] It should be noted that the first guide sleeve 301 clearly divides the interior of the diversion pipe 3 into three independent spaces:

[0044] The left chamber is only connected to the left branch tube 302, the double-layer airbag 4 and the first channel 101, and is completely isolated from other channels. The double-layer airbag 4 can intermittently form a negative pressure environment in the first channel 101 by utilizing its own elastic reset property.

[0045] The right chamber is only connected to the right branch tube 303, injection tube 5 and the third channel 103, and is used for the quantitative delivery of rinsing fluid. During the suctioning process, an appropriate amount of rinsing fluid is injected at the same time, which can effectively dilute the viscous sputum and make it easier to be suctioned out. After rinsing, it is immediately recovered through the first channel 101 and suction catheter 2 to avoid the backflow of liquid into the airway or the main ventilation route.

[0046] The second channel 102 is the central channel, which is the main ventilation route. The ventilator connector 304 is connected to the second channel 102 through the first guide sleeve 301, and oxygen is directly delivered into the airway through the bottom tracheal connector 7 to achieve airway sealing.

[0047] In this embodiment, as shown in Figures 1, 2 and 3, the double-layer airbag 4 is divided into an outer airbag 401 and an inner airbag 402. The front end of the inner airbag 402 is connected to a connecting pipe 403 that communicates with the left branch pipe 302. The end of the inner airbag 402 is connected to a waste liquid pipe 404, and the bottom of the waste liquid pipe 404 is threadedly connected to a waste liquid collection cylinder 405.

[0048] One-way valves are installed on both the connecting pipe 403 and the waste liquid pipe 404, and an air guide tube 8 is inserted into the end of the outer airbag 401.

[0049] A piston plate 501 is slidably connected inside the injection tube 5. The piston plate 501 divides the inside of the injection tube 5 into a liquid chamber 502 and a gas chamber 503. A piston rod 504 is fixedly connected to one side of the piston plate 501. A return spring 505 is sleeved on the surface of the piston rod 504.

[0050] One end of the gas delivery tube 8 is connected to the gas chamber 503 of the injection tube 5. The front end of the injection tube 5 is provided with a drain tube and an inlet tube, and both the drain tube and the inlet tube are equipped with a one-way valve. The drain tube is connected to the right branch tube 303, and the inlet tube is connected to a medicine bottle through a drainage tube.

[0051] It should be noted that the double-layer airbag 4 is mainly divided into an inner airbag 402 and an outer airbag 401. The front end of the inner airbag 402 is connected to the left branch pipe 302 through a connecting pipe 403, and a one-way valve is installed on the connecting pipe 403 for one-way liquid inlet. The end of the inner airbag 402 is connected to the waste liquid collection cylinder 405 through a waste liquid pipe 404, and a one-way valve is installed on the waste liquid pipe 404 for one-way liquid outlet, so that the recovered waste liquid is directly transported one-way into the waste liquid collection cylinder 405.

[0052] Furthermore, a drain pipe and an inlet pipe are respectively provided at the front end of the injection tube 5, and a one-way valve is installed on both the drain pipe and the inlet pipe. The one-way valve on the drain pipe controls the liquid to be discharged unidirectionally into the third channel 103, and the one-way valve on the inlet pipe controls the liquid to be discharged unidirectionally into the liquid chamber 502 of the injection tube 5. The outer airbag 401 is connected to the injection tube 5 through the air guide pipe 8. When the outer airbag 401 is squeezed, the gas enters the gas chamber 503 of the injection tube 5 through the air guide pipe 8, and the gas pushes the piston plate 501 to move, so that the double airbag 4 and the injection tube 5 work alternately.

[0053] Specifically, when the double-layered airbag 4 is squeezed and flattened, the waste liquid of the inner airbag 402 is directly collected from the waste liquid tube 404 into the waste liquid collection cylinder 405, while the gas of the outer airbag 401 enters the gas chamber 503 of the injection tube 5 through the air guide tube 8, pushing the piston plate 501 to move forward. The return spring 505 begins to stretch gradually. As the piston plate 501 moves, the flushing fluid in the liquid chamber 502 is delivered to the front end of the suction catheter 2 through the drain tube, the right branch tube 303 and the third channel 103. The flushing fluid can dilute the viscous sputum in the airway, making the sputum easier to be suctioned out and improving the efficiency of sputum suction.

[0054] Similarly, when the double-layer airbag 4 is released, the outer airbag 401 and the inner airbag 402 simultaneously begin to return to their original shape due to their own elasticity. At the same time, the return spring 505 rebounds and resets. During the reset process, the piston plate 501 moves backward in the opposite direction, and a negative pressure is formed in the liquid chamber 502. The flushing fluid in the medicine bottle enters the liquid chamber 502 of the injection tube 5 through the drainage tube and the inlet tube, preparing for the next flushing operation.

[0055] At the same time, the inner cuff 402 also begins to elastically reset. When the inner cuff 402 resets, it generates negative pressure suction. This negative pressure suction acts directly on the first channel 101, and the rinsing fluid and sputum remaining at the tip of the suction catheter 2 are recycled back into the inner cuff 402 through the first channel 101. This ensures that the rinsing fluid and sputum are in full contact, and effectively prevents the liquid from flowing back into the airway, reducing the risk of infection for the patient.

[0056] This process is repeated, with the double-layered airbag 4 and the injection tube 5 working alternately. This not only allows for the continuous and effective completion of sputum suction and rinsing, but also ensures the efficiency and safety of the entire process. Medical staff can perform a series of operations such as sputum suction, rinsing, and waste fluid recovery simply by squeezing and releasing the double-layered airbag 4, thus simplifying the sputum suction process.

[0057] In this embodiment, as shown in Figures 7, 8 and 9, the liquid guiding mechanism 6 includes a sleeve 601 fixedly connected to the inner wall of the air pipe connector 7. A guide plate 602 is sleeved on the outer surface of the sleeve 601. A second guide sleeve 603 is fixedly connected inside the sleeve 601. The second guide sleeve 603 divides the inside of the sleeve 601 into two left-right symmetrical drainage channels, and the bottoms of the two drainage channels are interconnected.

[0058] The drainage channel on the left is connected to the first channel 101, and the drainage channel on the right is connected to the third channel 103. The sleeve 601 has two circular openings on both sides, and the surface of the guide plate 602 has several permeation grooves distributed at equal angles.

[0059] The bottom of the second guide sleeve 603 is fixedly connected to two symmetrical valve plates 604. The outer walls of the valve plates 604 are respectively fixedly connected to two balloons 605. One side of the balloons 605 is fixedly connected to the inner wall of the tracheal connector 7. The top of each balloon 605 is connected to the inside of the second guide sleeve 603 through a hose.

[0060] It should be noted that the endotracheal connector 7 is mainly used to connect the patient's airway, and together with the ventilator connector 304 and the second channel 102, it forms a complete ventilation path.

[0061] Specifically, the ventilator is connected to the ventilator connector 304, and the endotracheal connector 7 is connected to the airway. The interface at the patient's airway is installed and fixed. Oxygen enters the first guide sleeve 301 through the ventilator connector 304, and then is discharged to the second channel 102 through the first guide sleeve 301. Then, it enters the patient's airway through the endotracheal connector 7 to directly deliver oxygen-containing gas and ensure continuous mechanical ventilation. Then, the suction catheter 2 is inserted. The front end of the suction catheter 2 enters the airway through the second channel 102, and the end of the suction catheter 2 is connected to the negative pressure mechanism to create negative pressure inside the suction catheter 2 and begin the suctioning operation.

[0062] Furthermore, a liquid diversion mechanism 6 is installed inside the tracheal connector 7. During suctioning, the liquid diversion mechanism 6 works in conjunction with the double-layered cuff 4 at the top and the injection tube 5 to release and recover the irrigation fluid.

[0063] The liquid guiding mechanism 6 is mainly composed of a sleeve 601, a guide plate 602, a second guide sleeve 603, two valve plates 604 and four balloons 605. The sleeve 601 is fixed to the inner wall of the air pipe connector 7, and the second guide sleeve 603 is fixed to the inner wall of the sleeve 601. The second guide sleeve 603 divides the interior of the sleeve 601 into two left-right symmetrical drainage channels, and the bottoms of the two drainage channels are connected.

[0064] The left drainage channel is connected to the first channel 101 and is used to recover residual flushing fluid and sputum. The right drainage channel is connected to the third channel 103 and is used to deliver flushing fluid. The sleeve 601 has two circular openings on each side, allowing the flushing fluid to quickly penetrate into the guide plate 602 and be evenly dispersed through the permeation grooves on the surface of the guide plate 602. This flushes the tip and surrounding area of ​​the suction catheter 2, diluting the sputum. During this process, the suction catheter 2 continuously performs suctioning, returning most of the flushing fluid and sputum to the surrounding area. The system collects the sputum and medication immediately through the first channel 101. The continuous negative pressure of the suction catheter 2 and the synchronous distribution of the fluid by the dilution plate 602 ensure that most of the rinsing fluid and sputum are immediately aspirated after dilution, reducing the time that the fluid stays in the airway and lowering the risk of fluid reflux and airway infection. At the same time, when the double-layered airbag 4 rebounds and resets, it generates negative pressure that acts directly on the first channel 101. The first channel 101 performs secondary suction on the small amount of residual fluid, further preventing fluid retention. This is especially suitable for critically ill patients with a high proportion of viscous sputum.

[0065] Specifically, when the double-layered airbag 4 is squeezed flat, the gas in the outer airbag 401 is delivered to the gas chamber 503 of the injection tube 5 through the air guide tube 8, and the piston plate 501 is squeezed to slide forward. During the sliding process, the flushing fluid is delivered to the third channel 103 through the right branch tube 303. The flushing fluid passes through the third channel 103 and the right drainage channel in sequence, and then enters the airway from the circular opening and the permeation groove.

[0066] Meanwhile, as the flushing fluid flows from top to bottom, it enters the balloon 605 through the tubing. It should be noted that the balloon 605 in this embodiment can automatically expand and contract and reset. The reset process generates suction to actively aspirate the flushing fluid and sputum. The positions of the two valve plates 604 will change accordingly with the volume change of the balloon 605. When the balloon 605 absorbs fluid and its volume increases, it pushes the valve plates 604 toward the center and they converge.

[0067] Similarly, after the flushing fluid in the injection tube 5 is discharged, the double-layered airbag 4 is released. The outer airbag 401 and the inner airbag 402 return to their original shape due to their own elasticity. The return spring 505 rebounds, causing the piston plate 501 to move in the opposite direction. A negative pressure is formed in the liquid chamber 502, and the flushing fluid in the medicine bottle re-enters the liquid chamber 502 of the injection tube 5 to prepare for the next flushing. At the same time, the negative pressure suction generated by the return of the inner airbag 402 acts on the first channel 101, and the flushing fluid and sputum remaining at the front end of the suction catheter 2 are recovered into the inner airbag 402 through the first channel 101.

[0068] During this process, the liquid inside the balloon 605 is also drawn out as the pressure changes, the balloon 605 becomes smaller, and the valve plate 604 separates to both sides. In this way, the liquid diversion mechanism 6 can complete the delivery of the flushing fluid and the recovery of residual liquid in an orderly manner, further ensuring the efficiency and safety of the suctioning process and avoiding the residue of liquid in the airway.

[0069] In addition, as the volume of the balloon 605 changes periodically, the two valves expand and contract in a regular manner, which exerts a regular squeezing effect on the suction catheter 2 in the second channel 102. This regular squeezing helps to promote the flow of sputum in the suction catheter 2, so that the sputum can be suctioned out more smoothly. This can further solve the problem of blockage at the tip of the suction catheter 2. Especially for sputum with high viscosity that is easy to cause blockage, this regular squeezing action can effectively prevent sputum from accumulating in the suction catheter 2, ensuring the continuity of the suctioning process. Moreover, repeated squeezing can also center the suction catheter 2, ensuring that the suction catheter 2 is always in the optimal position during operation, thus improving the suctioning effect.

[0070] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. 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 catheter, comprising an outer flexible tube (1), wherein a suction catheter (2) penetrates the inner wall of the outer flexible tube (1), characterized in that: A diversion tube (3) is fixedly installed at the end of the outer flexible tube (1). The outer flexible tube (1) is provided with a first channel (101), a second channel (102), and a third channel (103). A double-layered airbag (4) connected to the first channel (101) is installed on one side of the diversion tube (3), and an injection tube (5) connected to the third channel (103) is installed on the other side of the diversion tube (3). The injection tube (5) can work alternately with the double-layered airbag (4) to deliver fluid to the target target. The suction catheter (2) delivers a quantitative amount of rinsing fluid to its tip, and after rinsing, the residual fluid is recovered through the first channel (101) and the double-layered balloon (4); the tip of the outer tubing (1) is fixedly connected to a tracheal connector (7), and a liquid diversion mechanism (6) is installed inside the tracheal connector (7). The liquid diversion mechanism (6) is used to guide the rinsing fluid in and the residual fluid out, and simultaneously center the tip of the suction catheter (2); the liquid diversion mechanism (6) includes the tracheal connector (7). A sleeve (601) is fixedly connected to the inner wall of the sleeve (601). A guide plate (602) is fitted onto the outer surface of the sleeve (601). A second guide sleeve (603) is fixedly connected inside the sleeve (601), and the second guide sleeve (603) divides the interior of the sleeve (601) into two symmetrical drainage channels, with the bottoms of the two drainage channels interconnected. The drainage channel on the left is connected to the first channel (101), and the drainage channel on the right is connected to the third channel (103). Two circular openings are provided on both sides of the flow guide plate (601), and several permeation grooves with equal angles are opened on the surface of the flow guide plate (602); two symmetrical valve plates (604) are fixedly connected to the bottom of the second flow guide sleeve (603), and two balloons (605) are fixedly connected to the outer wall of the valve plate (604), and one side of the balloon (605) is fixedly connected to the inner wall of the tracheal connector (7), and the top of each balloon (605) is connected to the inside of the second flow guide sleeve (603) through a hose.

2. The closed suction catheter according to claim 1, characterized in that: The shunt tube (3) is fixedly connected to a first flow guide sleeve (301), and the first flow guide sleeve (301) divides the interior of the shunt tube (3) into two symmetrical chambers. A left branch tube (302) is fixedly connected to one side of the shunt tube (3), and a right branch tube (303) is fixedly connected to the other side of the shunt tube (3). A ventilator connector (304) is inserted into one side of the shunt tube (3). The chamber on the left side is connected to the double-layered air bag (4) through the left branch tube (302), and the chamber on the right side is connected to the injection tube (5) through the right branch tube (303). The ventilator connector (304) is connected to the first flow guide sleeve (301).

3. A closed suction catheter according to claim 2, characterized in that: The double-layer airbag (4) is divided into an outer airbag (401) and an inner airbag (402). The front end of the inner airbag (402) is connected to a connecting pipe (403) that communicates with the left branch pipe (302). The end of the inner airbag (402) is connected to a waste liquid pipe (404), and the bottom of the waste liquid pipe (404) is threadedly connected to a waste liquid collection cylinder (405).

4. A closed suction catheter according to claim 3, characterized in that: One-way valves are installed on both the connecting pipe (403) and the waste liquid pipe (404), and an air guide pipe (8) is inserted into the end of the outer airbag (401).

5. A closed suction catheter according to claim 4, characterized in that: A piston plate (501) is slidably connected inside the injection tube (5). The piston plate (501) divides the inside of the injection tube (5) into a liquid chamber (502) and a gas chamber (503). A piston rod (504) is fixedly connected to one side of the piston plate (501). A return spring (505) is sleeved on the surface of the piston rod (504).

6. A closed suction catheter according to claim 5, characterized in that: One end of the gas guide tube (8) is connected to the gas chamber (503) of the injection tube (5). The front end of the injection tube (5) is provided with a drain pipe and an inlet pipe, and both the drain pipe and the inlet pipe are equipped with a one-way valve. The drain pipe is connected to the right branch pipe (303), and the inlet pipe is connected to a medicine bottle through a drainage pipe.

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