Low-injury lung isolation ventilation catheter

Abstract

The invention discloses a low-injury lung isolation ventilation catheter, belongs to the technical field of lung isolation equipment, and aims to solve the problems that although a product in split type insertion connection has certain flexibility, only pure insertion connection lacks an effective limiting structure, and the connection stability is insufficient. The three-way connector can rotate relative to the connecting pipe, connection stability and operation flexibility are both considered, surgical operation smoothness is improved, independent inflation cavities achieve independent control of multiple air bags, fixation is reliable, cross influence is avoided, the isolation effect is better, the drainage function of the affected side lung is achieved, and the structure design of the independent drainage cavities is adopted, so that the drainage effect is good. The device has the advantages that the device is simple in structure and convenient to operate, aspiration in the resuscitation period caused by pulmonary effusion on the affected side is prevented, clinical application is safer, the visual cavity is matched with the camera, accurate catheterization is achieved, respiratory mucosa injury is reduced, the stability problem of a split type plug-in product is solved, and the risks of displacement and unplanned catheter drawing in an operation are avoided through double limiting of the limiting ring, the clamping groove and the limiting plate.

Description

Technical Field

[0001] This invention relates to the field of lung isolation equipment technology, and more specifically, to a low-damage lung isolation ventilation duct. Background Technology

[0002] In medical settings such as thoracic surgery and lung infection control, lung isolation ventilation technology is a key means to ensure treatment effectiveness. Its core is to isolate the left and right lung airways through catheters to achieve single-lung ventilation or separate ventilation.

[0003] However, the connection method between the main ventilation tube and the three-way valve in existing lung isolation ventilation tubes has obvious defects. Although the integrated manufacturing product can ensure connection stability, the three-way valve cannot rotate relative to each other, which seriously affects the smoothness of the surgical operation. Although the split plug-in connection product has a certain degree of flexibility, it lacks an effective limiting structure and the connection stability is insufficient. It is easy to shift during the operation, affecting the ventilation effect, and may also increase the risk of unplanned extubation, or even cause additional damage to the respiratory mucosa.

[0004] Therefore, in order to address such issues, we propose a low-damage lung isolation ventilation duct. Summary of the Invention

[0005] The purpose of this invention is to provide a low-damage lung isolation ventilation tube, which aims to solve the problem in the above-mentioned background technology that although split plug-in connection products have a certain degree of flexibility, they lack an effective limiting structure and have insufficient connection stability due to simple plug-in connection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a low-damage lung isolation ventilation tube, comprising a three-way connector, a connecting tube at the lower end of the three-way connector, a ventilation tube assembly connected to the connecting tube at the lower end of the three-way connector, and a sealing tube assembly at the upper end of the three-way connector;

[0007] The connecting pipe includes a first sealing ring fixedly connected to the inner side wall, a first mounting groove is provided on the bottom inner wall of the connecting pipe, a second mounting groove is provided on the bottom inner wall of the first mounting groove, a limit plate is slidably connected to the inner wall of the second mounting groove, a push plate is fixedly connected to the upper end of the limit plate, and a second sealing ring is provided on the outer side wall at the lower port of the tee connector.

[0008] Preferably, the ventilation conduit assembly includes a ventilation main tube disposed on the outer wall of the lower end of the connecting tube. A first air bladder is disposed on the outer wall of the lower end of the ventilation main tube, and a second air bladder is disposed on the outer wall of the middle part of the ventilation conduit assembly. A first inflation chamber and a second inflation chamber are disposed inside the ventilation main tube. A first inflation port is opened on the outer wall of the lower end of the ventilation main tube, and a second inflation port is disposed on the outer wall of the middle part of the ventilation main tube. The first inflation chamber, the first inflation port, and the first air bladder are connected. The second inflation chamber, the second inflation port, and the second air bladder are connected. A first inflation connector is disposed at the end of the first inflation chamber away from the first inflation port through a connecting tube, and a second inflation connector is disposed at the end of the second inflation chamber away from the second inflation port through a connecting tube.

[0009] Preferably, the occlusion catheter assembly includes an occlusion main tube, a third inflation chamber is provided inside the occlusion main tube, a four-way connector is provided at one end of the occlusion main tube, a third airbag is provided on the side wall of the lower end of the occlusion main tube, a third inflation port is provided on the side wall of the lower end of the occlusion main tube, the third inflation port, the third inflation chamber and the third airbag are connected, a third inflation connector is provided at the end of the third inflation chamber away from the third airbag through a connecting pipe, and the third inflation connector passes through one port of the four-way connector.

[0010] Preferably, the ventilation main tube has a drainage cavity inside, and a drainage port is provided at the lower end of the ventilation main tube. The drainage cavity is connected to the drainage port, and a drainage connector is provided at the end of the drainage cavity away from the drainage port through a connecting pipe.

[0011] Preferably, the main ventilation tube has a ventilation cavity inside, a first ventilation port is provided at the lower end of the main ventilation tube, and a second ventilation port is provided on the side wall at the bend at the lower end of the main ventilation tube. The connecting tube, the ventilation cavity, the first ventilation port and the second ventilation port are connected.

[0012] Preferably, a visual cavity is provided inside the sealing main tube, and a camera is provided on the inner wall of the visual cavity at the end away from the four-way connector. A visual wire is provided at one end of the camera. The end of the visual wire away from the camera passes through the visual cavity and one port of the four-way connector. A control handle is provided at the end of the visual wire away from the camera. A visual element is provided at one end of the control handle through a connecting wire.

[0013] Preferably, the sealing main tube has an exhaust chamber inside, and an exhaust port is provided at the end of the sealing main tube away from the four-way connector. The exhaust chamber and the exhaust port are connected. An exhaust connector is provided at the end of the exhaust chamber away from the exhaust port through a connecting pipe. The exhaust connector passes through one port of the four-way connector.

[0014] Preferably, a sealing plate is fixedly connected to the lower end of the push plate, and a chamfer is provided at the lower end of the limiting plate.

[0015] Preferably, a fixing ring is fixedly connected to the outer wall of the upper port of the tee connector, a sealing ring is provided at the upper end of the fixing ring, and a fixing cap is movably connected to the outer wall of the upper port of the tee connector, and a threaded groove is provided on the inner wall of the fixing cap.

[0016] Preferably, a limiting ring is fixedly connected to the inner wall of the connecting pipe, the inner wall of the upper end of the limiting ring is provided with a right angle, and a slot is opened on the outer wall of the lower port of the tee connector. The slot is located above the second sealing ring, and the limiting ring is engaged with the slot.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The tee connector can rotate relative to the connecting tube, balancing connection stability and operational flexibility, and improving the smoothness of surgical procedures.

[0019] 2. Independent inflation chambers allow for individual control of multiple airbags, ensuring reliable fixation and preventing cross-influence, resulting in superior isolation.

[0020] 3. It has the function of draining the affected lung and has an independent drainage cavity structure design to prevent aspiration during the recovery period caused by effusion in the affected lung, making it safer for clinical application. In addition, the visual cavity and camera work together to achieve precise tube placement and reduce damage to the respiratory mucosa.

[0021] 4. The bending design at the lower end of the main ventilation tube, combined with the positioning of the protrusion of the second ventilation port, adapts to the human airway structure and further reduces damage.

[0022] 5. The stability problem of split-type plug-in products has been solved. Through the dual limiting of the limiting ring, the slot, and the limiting plate, the risk of displacement during surgery and unplanned tube removal is avoided. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a schematic diagram of the ventilation duct assembly in this invention;

[0025] Figure 3 This is a schematic diagram of the sealing catheter assembly in this invention;

[0026] Figure 4 This is a schematic diagram of the combined structure of the sealing conduit assembly and the tee connector in this invention;

[0027] Figure 5 This is a schematic diagram of the cross-sectional structure of the main ventilation pipe in this invention;

[0028] Figure 6This is a schematic diagram of the combined structure of the ventilation duct assembly and the three-way connector in this invention;

[0029] Figure 7 This is a cross-sectional view of the connecting pipe in this invention. Figure 1 ;

[0030] Figure 8 This is a cross-sectional view of the connecting pipe in this invention. Figure 2 ;

[0031] Figure 9 This is a cross-sectional view of the tee connector in this invention;

[0032] Figure 10 In this invention Figure 9 Enlarged diagram of point A.

[0033] Legend:

[0034] 1. Ventilation duct assembly; 11. First airbag; 12. Second airbag; 13. Ventilation main tube; 131. First inflation chamber; 1311. First inflation port; 132. Second inflation chamber; 1321. Second inflation port; 133. Drainage chamber; 1331. Drainage port; 134. Ventilation chamber; 1341. First ventilation port; 1342. Second ventilation port; 14. Second inflation connector; 15. First inflation connector; 16. Drainage connector; 17. Connecting tube; 171. Limiting ring; 172. First sealing ring; 173. First mounting groove; 174. Second mounting groove 1. Groove; 175. Limiting plate; 176. Push plate; 177. Sealing plate; 2. T-connector; 21. Second sealing ring; 22. Slot; 23. Fixing ring; 24. Sealing ring; 25. Fixing cap; 3. Sealing conduit assembly; 31. Camera; 32. Third airbag; 33. Sealing main tube; 331. Visible cavity; 332. Exhaust cavity; 3321. Exhaust port; 333. Third inflation cavity; 3331. Third inflation port; 34. Four-way connector; 35. Third inflation connector; 36. Exhaust connector; 37. Visible wire; 4. Control handle; 5. Visible component. 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] To address the issue that while split-type plug-in connection products offer some flexibility, the lack of effective limiting structures and insufficient connection stability due to simple plug-in connections alone are problems, please refer to [link to relevant documentation]. Figure 1 - Figure 10The following preferred technical solutions are provided.

[0037] One embodiment of the present invention provides a low-damage lung isolation ventilation tube, including a three-way connector 2, a connecting tube 17 at the lower end of the three-way connector 2, a ventilation tube assembly 1 connected to the connecting tube 17 at the lower end of the three-way connector 2, and a sealing tube assembly 3 at the upper end of the three-way connector 2.

[0038] The connecting pipe 17 includes a first sealing ring 172 fixedly connected to the inner side wall, a first mounting groove 173 is provided on the inner bottom wall of the connecting pipe 17, a second mounting groove 174 is provided on the inner bottom wall of the first mounting groove 173, a limit plate 175 is slidably connected to the inner wall of the second mounting groove 174, a push plate 176 is fixedly connected to the upper end of the limit plate 175, and a second sealing ring 21 is provided on the outer side wall at the lower port of the tee connector 2.

[0039] Specifically, when installing the connecting pipe 17 and the tee connector 2, first align the tee connector 2 with the port of the connecting pipe 17 and insert it into it. During the insertion process, the lower port of the tee connector 2 will contact the upper end of the push plate 176 inside the connecting pipe 17 and generate a downward pressing force. This pressing force drives the push plate 176 to simultaneously drive the limiting plate 175 fixedly connected to it to slide along the inner wall of the second mounting groove 174 opened below the first mounting groove 173 inside the connecting pipe 17. When the tee connector 2 is inserted into place, the limiting ring 1 on the inner wall of the connecting pipe 17 will then... 71 engages with the slot 22 on the outer wall of the tee connector 2 to achieve axial fixation between the two. The lower end of the limiting plate 175 finally abuts against the outer wall of the ventilating main pipe 13 sleeved on the outer wall of the lower port of the connecting pipe 17. Through the abutment and limiting of the limiting plate 175 against the outer wall of the ventilating main pipe 13, the axial displacement of the ventilating main pipe 13 on the connecting pipe 17 is effectively restricted. At the same time, it does not affect the rotational flexibility of the tee connector 2 around the connecting pipe 17. Finally, a stable and flexible connection is achieved between the connecting pipe 17, the tee connector 2 and the ventilating main pipe 13.

[0040] The ventilation conduit assembly 1 includes a ventilation main tube 13 disposed on the outer wall of the lower end of the connecting tube 17. A first airbag 11 is disposed on the outer wall of the lower end of the ventilation main tube 13, and a second airbag 12 is disposed on the outer wall of the middle portion of the ventilation conduit assembly 1. The ventilation main tube 13 contains a first inflation chamber 131 and a second inflation chamber 132. A first inflation port 1311 is provided on the outer wall of the lower end of the ventilation main tube 13, and a second inflation port 1321 is provided on the outer wall of the middle portion of the ventilation main tube 13. The first inflation chamber... 131. The first inflation port 1311 is connected to the first airbag 11. The second inflation chamber 132, the second inflation port 1321, and the second airbag 12 are connected. The end of the first inflation chamber 131 away from the first inflation port 1311 is provided with a first inflation connector 15 through a connecting pipe. The end of the second inflation chamber 132 away from the second inflation port 1321 is provided with a second inflation connector 14 through a connecting pipe. In this embodiment, the Shore hardness of the first airbag 11 is ≤45 degrees, and the Shore hardness of the second airbag 12 is ≤75 degrees.

[0041] Specifically, after the low-damage lung isolation ventilation tube is inserted, the external inflation device is connected to the first inflation connector 15 and the second inflation connector 14 on the main ventilation tube 13, respectively, to independently deliver gas into both. The gas delivered by the first inflation connector 15 is conducted through the first inflation chamber 131 inside the main ventilation tube 13, and finally injected into the first air bag 11 through the first inflation port 1311 on the lower outer wall of the main ventilation tube 13. This inflates the first air bag 11 to a size suitable for the inner diameter of the bronchus, thereby fixing it inside the bronchus, as shown in the attached instruction manual. Figure 6 At position C, simultaneously, the gas supplied by the second inflation connector 14 is conducted through the second inflation chamber 132 inside the main ventilation tube 13, and injected into the second airbag 12 through the second inflation port 1321 on the outer wall of the middle part of the main ventilation tube 13. This causes the second airbag 12 to inflate to a size that matches the inner diameter of the air tube, thereby fixing it inside the air tube, as per the instruction manual. Figure 6 At position D, the inflation of the two cuffs can be precisely adjusted according to the actual inner diameter of the trachea and bronchi by independently controlling the inflation of the cuffs. This ensures that the main ventilation tube 13 is firmly fixed in the airway and avoids displacement after placement. It can also adapt to differences in airway structure through graded fixation, reducing pressure damage to the airway mucosa, and providing a stable catheter basis for subsequent lung isolation ventilation.

[0042] The occlusion catheter assembly 3 includes an occlusion main tube 33, a third inflation chamber 333 is provided inside the occlusion main tube 33, a four-way connector 34 is provided at one end of the occlusion main tube 33, a third airbag 32 is provided on the side wall of the lower end of the occlusion main tube 33, a third inflation port 3331 is provided on the side wall of the lower end of the occlusion main tube 33, the third inflation port 3331, the third inflation chamber 333 and the third airbag 32 are connected, a third inflation connector 35 is provided at the end of the third inflation chamber 333 away from the third airbag 32 through a connecting tube, and the third inflation connector 35 passes through one port of the four-way connector 34. In this embodiment, the Shore hardness of the third airbag 32 is ≤75 degrees.

[0043] Specifically, in this low-damage lung isolation ventilation tube, an external inflation device is connected to the third inflation connector 35 of the sealing main tube 33 to deliver gas into it. The gas is conducted through the third inflation chamber 333 inside the sealing main tube 33 and finally injected into the third air bladder 32 through the third inflation port 3331 on the lower side wall of the sealing main tube 33, causing the third air bladder 32 to inflate. The inflated third air bladder 32 fits tightly against the inner wall of the airway, forming a stable inflation fixation for the lower end of the sealing main tube 33, preventing the sealing main tube 33 from shifting within the airway, and ensuring the stability of subsequent operations. On the other hand, the inflatable third airbag 32 can precisely block the airway corresponding to the affected lung, achieving physical isolation between the affected and healthy lungs and preventing communication between the airways of the two lungs. After the isolation and blockage of the affected lung is completed, the external air supply equipment can deliver oxygen to the healthy lung separately through the ventilation chamber 134 and the second ventilation port 1342 of the ventilation main tube 13 to meet the ventilation needs of the healthy lung. At the same time, through the continuous isolation effect of the third airbag 32, secretions or gas from the affected lung are prevented from entering the healthy lung, ultimately achieving safe management of lung isolation ventilation and reducing the risk of cross-infection and decreased ventilation efficiency.

[0044] The ventilation main pipe 13 has a drainage cavity 133 inside, and a drainage port 1331 is provided at the lower end of the ventilation main pipe 13. The drainage cavity 133 is connected to the drainage port 1331. The end of the drainage cavity 133 away from the drainage port 1331 is provided with a drainage connector 16 through a connecting pipe.

[0045] Specifically, the ventilation main tube 13 has an independent drainage chamber 133 inside, and its lower end has a drainage port 1331 that communicates with the airway of the affected lung. The end of the drainage chamber 133 away from the drainage port 1331 extends to the outside of the ventilation main tube 13 through a connecting tube and connects to the drainage connector 16. When fluid accumulates in the affected lung during the operation, the drainage connector 16 is connected to the external drainage device. The fluid in the affected lung is drawn into the drainage chamber 133 through the drainage port 1331, and then flows along the internal channel of the drainage chamber 133 to the drainage connector 16. Finally, it is collected and discharged by the external drainage device. The entire process achieves physical isolation between the fluid and the ventilation airflow through the independent channel of the drainage chamber 133, avoiding the fluid from stagnating in the airway or entering the healthy lung with breathing, thereby effectively preventing the risk of aspiration and ensuring airway safety during the operation.

[0046] The ventilation main tube 13 has a ventilation chamber 134 inside. The lower end of the ventilation main tube 13 has a first ventilation port 1341. The side wall of the bend at the lower end of the ventilation main tube 13 has a second ventilation port 1342. The connecting tube 17, the ventilation chamber 134, the first ventilation port 1341 and the second ventilation port 1342 are connected. In this embodiment, the shaping angle at the bend at the lower end of the ventilation main tube 13 can preferably be 120-150 degrees to adapt to the physiological structure of the human airway and ensure that the second ventilation port 1342 is accurately connected to the airway of the healthy lung.

[0047] Specifically, firstly, the three-way connector 2, connecting pipe 17, ventilation chamber 134 inside the ventilation main pipe 13, first ventilation port 1341 at the lower end of the ventilation main pipe 13, and second ventilation port 1342 on the side wall of the lower end bend form a complete ventilation passage. When it is necessary to ventilate both lungs at the same time, the side wall port of the three-way connector 2 is connected to the external air supply equipment. The gas output from the external air supply equipment enters the ventilation chamber 134 through the three-way connector 2 and connecting pipe 17 in sequence, and is then delivered to the airways of both lungs through the first ventilation port 1341 and the second ventilation port 1342 respectively, to meet the ventilation needs of both lungs.

[0048] When oxygenation and ventilation of the healthy lung alone are required, the first ventilation port 1341 is blocked by the expansion of the third air bag 32, thus blocking the ventilation pathway of the affected lung. At this time, the gas delivered by the external gas supply device is still conducted along the three-way connector 2, connecting tube 17, and ventilation chamber 134. Because the first ventilation port 1341 is blocked, the gas is only delivered to the healthy lung through the second ventilation port 1342. Moreover, during tube insertion, the second ventilation port 1342 is precisely positioned at the carina, as shown in the instruction manual. Figure 6 At point B, combined with the 120-150 degree angle at the lower bend of the main ventilation tube 13, oxygen can be delivered to the healthy lung, ensuring the ventilation efficiency of the healthy lung, while simultaneously achieving effective isolation between the affected and healthy lungs.

[0049] The main sealing tube 33 has a viewing cavity 331 inside. A camera 31 is installed on the inner wall of the viewing cavity 331 away from the four-way connector 34. A viewing wire 37 is installed at one end of the camera 31. The end of the viewing wire 37 away from the camera 31 passes through the viewing cavity 331 and one port of the four-way connector 34. A control handle 4 is installed at the end of the viewing wire 37 away from the camera 31. A viewing element 5 is installed at one end of the control handle 4 through a connecting wire.

[0050] Specifically, the main sealing tube 33 has an independently provided visual cavity 331. A camera 31 is installed on the inner wall of the end of the visual cavity 331 away from the four-way connector 34. The camera 31 forms a signal transmission path with the external control handle 4 and the visual component 5 through the visual cable 37. During the tube placement process, the operator adjusts the position of the main sealing tube 33 through the control handle 4, so that the camera 31 enters the airway synchronously with the tube. The camera 31 collects images of the airway in real time, including images of the carina position and the condition of the airway in the affected lung, and transmits the image signals through the visual cable 37. With the visual component 5, medical staff can directly observe the acquired images. On the one hand, they can accurately determine whether the second ventilation port 1342 has reached the preset carina based on the carina feature image, thus achieving carina-assisted positioning. On the other hand, they can observe the mucosal condition and secretions in the airway of the affected lung in real time, thus completing real-time monitoring and image acquisition of the affected lung. At the same time, based on the visual image feedback, medical staff can accurately adjust the insertion depth and angle of the catheter to avoid blindly touching and squeezing the airway mucosa, thus achieving accurate placement of this type of catheter and ultimately reducing airway damage.

[0051] The sealing main pipe 33 has an exhaust chamber 332 inside. The end of the sealing main pipe 33 away from the four-way connector 34 has an exhaust port 3321. The exhaust chamber 332 and the exhaust port 3321 are connected. The end of the exhaust chamber 332 away from the exhaust port 3321 is provided with an exhaust connector 36 through a connecting pipe. The exhaust connector 36 passes through one port of the four-way connector 34.

[0052] Specifically, the external inflation device inflates the third airbag 32 through the third inflation connector 35. The inflated third airbag 32 fits tightly against the inner wall of the ventilation chamber 134, precisely blocking the airflow channel from the ventilation chamber 134 to the affected lung, cutting off the connection between the affected lung and the external air supply device, and isolating the airways of the affected lung and the healthy lung to prevent air from the healthy lung from entering the affected lung during the suction process. Subsequently, the exhaust connector 36 on the sealing main tube 33 is connected to the external suction device. After the external suction device is started, the negative pressure suction force generated by it is transmitted through the exhaust connector 36 to the exhaust chamber 332 inside the sealing main tube 33, and then acts on the airway of the affected lung through the exhaust port 3321 at the end of the exhaust chamber 332. Under the action of negative pressure, the air in the affected lung is continuously extracted, causing the lung tissue of the affected lung to gradually collapse, and finally achieving the effect of lung collapse of the affected lung.

[0053] Furthermore, in order to enhance the stability of the device, such as Figure 7 - Figure 10 As shown, the following preferred technical solutions are provided.

[0054] A sealing plate 177 is fixedly connected to the lower end of the push plate 176, and a right angle is provided at the lower end of the limiting plate 175. The sealing plate 177 is used to seal the second mounting groove 174 to prevent air leakage from the second mounting groove 174.

[0055] A retaining ring 23 is fixedly connected to the outer wall of the upper port of the tee connector 2. A sealing ring 24 is provided at the upper end of the retaining ring 23. A retaining cap 25 is movably connected to the outer wall of the upper port of the tee connector 2. The inner wall of the retaining cap 25 has a threaded groove. (Refer to the attached instruction manual.) Figure 10 The three-way connector 2 and the four-way connector 34 work together through threaded connection and sealing structure to achieve a stable connection and air passage seal.

[0056] A retaining ring 23 is fixedly installed on the outer wall of the upper port of the tee connector 2. An elastic sealing ring 24 is fitted to the upper end of the retaining ring 23. Simultaneously, a retaining cap 25 with a threaded groove on its inner wall is movably fitted onto the outer wall of the upper port of the tee connector 2. During connection, first align the corresponding port of the four-way connector 34 with the upper port of the tee connector 2 and insert it, so that the lower end face of the four-way connector 34 contacts the sealing ring 24 at the upper end of the retaining ring 23. Then, rotate the retaining cap 25, utilizing the engagement of its inner threaded groove with the external thread of the corresponding port of the four-way connector 34. Through threaded transmission, the retaining cap 25 moves upward. This exerts a downward clamping force on the four-way connector 34. Under this clamping force, the port of the four-way connector 34 continuously compresses the sealing ring 24, causing the sealing ring 24 to undergo elastic deformation. The deformed sealing ring 24 tightly fills the gap between the port of the four-way connector 34 and the fixing ring 23. Finally, the mechanical and stable connection between the three-way connector 2 and the four-way connector 34 is achieved through the threaded connection of the fixing cap 25. At the same time, the gap filling effect of the deformed sealing ring 24 prevents gas leakage from the connection between the two, ensuring the airtightness of the ventilation passage and providing a reliable connection basis for subsequent lung isolation ventilation.

[0057] A limiting ring 171 is fixedly connected to the inner wall of the connecting tube 17. The inner wall of the upper end of the limiting ring 171 is provided with a right angle. A slot 22 is opened on the outer wall of the lower port of the tee connector 2. The slot 22 is located above the second sealing ring 21. The limiting ring 171 and the slot 22 are engaged and connected. In this embodiment, the connecting tube 17 can be made of medical grade thermoplastic polyurethane. The connecting tube 17 and the tee connector 2 achieve a stable connection that is "rotatable and prevents detachment" through the engaging structure of the limiting ring 171 and the slot 22.

[0058] The connecting tube 17 is made of medical-grade thermoplastic polyurethane. A limiting ring 171 is fixedly connected to its inner wall, and the upper inner wall of the limiting ring 171 has a chamfered right angle. Correspondingly, a groove 22 is formed on the outer wall of the lower port of the tee connector 2. The groove 22 is located above the second sealing ring 21 and forms a matching engaging structure with the limiting ring 171. During connection, the lower port of the tee connector 2 is aligned with the port of the connecting tube 17, and an axial thrust is applied. Due to the elastic properties of the connecting tube 17, its port undergoes slight deformation under the thrust, causing the limiting ring 171 to expand outward with the port deformation, providing space for the insertion of the tee connector 2. When the tee connector 2 is inserted... When the limiting ring 171 is inserted to the preset depth and the slot 22 is aligned, the port of the connecting tube 17 loses the external pressure and recovers its deformation under its own elasticity. The limiting ring 171 contracts synchronously and embeds into the slot 22, forming a stable engagement. After engagement, the axial limiting effect of the limiting ring 171 and the slot 22 can prevent the tee connector 2 from moving up and down relative to the connecting tube 17, thus preventing them from separating. At the same time, the circumferential contact structure of the limiting ring 171 and the slot 22 does not restrict their relative rotation, allowing the tee connector 2 to rotate flexibly around the central axis of the connecting tube 17, taking into account both connection stability and surgical operation flexibility.

[0059] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low trauma lung isolation ventilation catheter comprising a T- junction (2) characterised in that: The lower end of the tee joint (2) is provided with a connecting pipe (17), the lower end of the tee joint (2) is provided with a ventilation catheter assembly (1) connected through the connecting pipe (17), and the upper end of the tee joint (2) is provided with a plugging catheter assembly (3); The connecting pipe (17) comprises a first sealing ring (172) fixedly connected to the inner side wall, a first installation groove (173) is formed in the inner bottom wall of the connecting pipe (17), a second installation groove (174) is formed in the inner bottom wall of the first installation groove (173), a limiting plate (175) is slidably connected to the inner wall of the second installation groove (174), and a push plate (176) is fixedly connected to the upper end of the limiting plate (175).

2. The low-injury lung isolation venous catheter of claim 1, wherein: The ventilation catheter assembly (1) comprises a ventilation main pipe (13) arranged at the outer side wall of the lower end of the connecting pipe (17), a first air bag (11) arranged at the outer side wall of the lower end of the ventilation main pipe (13), a second air bag (12) arranged at the outer side wall of the middle part of the ventilation catheter assembly (1), a first inflation cavity (131) and a second inflation cavity (132) arranged in the ventilation main pipe (13), a first inflation port (1311) formed in the outer side wall of the lower end of the ventilation main pipe (13), a second inflation port (1321) arranged at the outer side wall of the middle part of the ventilation main pipe (13), the first inflation cavity (131), the first inflation port (1311) and the first air bag (11) being in communication, the second inflation cavity (132), the second inflation port (1321) and the second air bag (12) being in communication, and the first inflation cavity (131) being provided with a first inflation connector (15) at one end away from the first inflation port (1311) through a connecting pipe.

3. The low-injury lung isolation venous catheter of claim 1, wherein: The plugging catheter assembly (3) comprises a plugging main pipe (33), the plugging main pipe (33) is provided with a four-way joint (34) at one end, a third inflation cavity (333) is arranged in the plugging main pipe (33), a third air bag (32) is arranged at the side wall of the lower end of the plugging main pipe (33), a third inflation port (3331) is formed in the side wall of the lower end of the plugging main pipe (33), the third inflation port (3331), the third inflation cavity (333) and the third air bag (32) are in communication, and the third inflation cavity (333) is provided with a third inflation connector (35) at one end away from the third air bag (32) through a connecting pipe.

4. The low-injury lung isolation venous catheter of claim 2, wherein: The plugging main pipe (33) is provided with a drainage cavity (133) inside, a drainage port (1331) is arranged at the lower end of the plugging main pipe (33), the drainage cavity (133) is in communication with the drainage port (1331), and the drainage cavity (133) is provided with a drainage connector (16) at one end away from the drainage port (1331) through a connecting pipe.

5. The low-injury lung isolation venous catheter of claim 2, wherein: The ventilation main pipe (13) is internally provided with a ventilation cavity (134), the lower end of the ventilation main pipe (13) is provided with a first ventilation port (1341), the side wall of the lower end bending part of the ventilation main pipe (13) is provided with a second ventilation port (1342), the connection pipe (17), the ventilation cavity (134), the first ventilation port (1341) and the second ventilation port (1342) are communicated.

6. The low-injury lung isolation venous catheter of claim 3, wherein: The occlusion main pipe (33) is internally provided with a visible cavity (331), the inner wall of the end of the visible cavity (331) away from the four-way joint (34) is provided with a camera (31), one end of the camera (31) is provided with a visible wire (37), the end of the visible wire (37) away from the camera (31) penetrates through the visible cavity (331) and one port of the four-way joint (34), the end of the visible wire (37) away from the camera (31) is provided with a control handle (4), one end of the control handle (4) is provided with a visible part (5) through a connecting line.

7. The low-injury lung isolation venous catheter of claim 3, wherein: The occlusion main pipe (33) is internally provided with an exhaust cavity (332), the end of the occlusion main pipe (33) away from the four-way joint (34) is provided with an exhaust port (3321), the exhaust cavity (332) and the exhaust port (3321) are communicated, the end of the exhaust cavity (332) away from the exhaust port (3321) is provided with an exhaust joint (36) through a connecting pipe, the exhaust joint (36) penetrates through one port of the four-way joint (34).

8. The low-injury lung isolation venous catheter of claim 1, wherein: The lower end of the push plate (176) is fixedly connected with a sealing plate (177), and the lower end of the limiting plate (175) is provided with an inverted right angle.

9. The low-injury lung isolation venous catheter of claim 1, wherein: The outer side wall of the upper port of the three-way joint (2) is fixedly connected with a fixed ring (23), the upper end of the fixed ring (23) is provided with a sealing ring (24), the outer side wall of the upper port of the three-way joint (2) is movably connected with a fixed cap (25), and the inner wall of the fixed cap (25) is provided with a threaded groove.

10. The low-injury lung isolation venous catheter of claim 1, wherein: The inner wall of the connection pipe (17) is fixedly connected with a limiting ring (171), the inner wall of the upper end of the limiting ring (171) is provided with an inverted right angle, the outer side wall of the lower port of the three-way joint (2) is provided with a clamping groove (22), the clamping groove (22) is located above the second sealing ring (21), and the limiting ring (171) is clamped and connected with the clamping groove (22).

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