Radioparticle-loaded three-balloon nasal feeding tube composite set for nasal esophageal tracheal fistula

Abstract

The utility model relates to the field of medical instruments, in particular to a nasal esophageal tracheal fistula three-balloon nasal feeding tube composite set loaded with radioactive particles, which comprises a tube body, a lower blocking balloon, a particle balloon, an upper blocking balloon, a tube body butt joint structure and a nasal guide structure. The radion-loaded three-balloon nasal feeding tube composite set for the nasal esophageal and tracheal fistula is a medical instrument which is combined with the nasal feeding tube and can be used for blocking and treating a fistula opening of a patient suffering from the esophageal and esophageal fistula and carrying out precise targeted radiotherapy on a cancerous part of esophageal cancer, and feeding nutrition of the patient is convenient to convey. The device is simple in structure, convenient to operate, high in working and operating efficiency, stable in operation, beneficial to popularization and promotion, capable of effectively relieving pain of patients, convenient to mount and dismount, obvious in acting effect, capable of achieving differentiated treatment, stable in whole and high in pertinence, and has wide market prospects.

Description

Technical Field

[0001] This utility model relates to the field of medical devices, specifically to a composite kit for a nasoesophageal tracheoesophageal fistula containing a three-balloon nasogastric feeding tube with radioactive particles. Background Technology

[0002] Tracheoesophageal fistula is a relatively rare clinical symptom, generally classified into congenital and acquired types. Congenital tracheoesophageal fistulas are mostly accompanied by congenital esophageal atresia, while acquired tracheoesophageal fistulas are primarily caused by acquired trauma, thyroid and esophageal tumors, and iatrogenic injuries, with iatrogenic injuries having a higher incidence after tracheotomy or endotracheal intubation. Although uncommon, these can be significant causes of serious complications and death, especially in patients with esophageal or lung cancer. Currently, esophageal and tracheal stents have become important treatment methods for tracheoesophageal fistulas. However, the fabrication and placement of stents require careful consideration of many factors, including the size and location of the fistula and the shape of surrounding bronchi, and demand considerable skill from the interventional physician. Problems at any stage can lead to ineffective fistula closure. Therefore, traditional interventional treatment has a higher incidence of complications compared to surgery, such as stent displacement, breakage, inadequate fistula closure, and intraluminal neoplasm formation. In several studies using bronchial stents for esophageal-tracheal fistula repair, the success rate of fistula closure ranged from only 40% to 70%.

[0003] Esophageal cancer is a common digestive tract tumor. The typical symptom is progressive dysphagia. Early symptoms are often subtle, but there may be varying degrees of discomfort when swallowing hard or coarse foods, including a choking sensation, burning, stabbing, or pulling / friction-like pain behind the sternum. Symptoms fluctuate in severity, leading to a decline in the patient's quality of life. As the tumor grows, the patient initially has difficulty swallowing dry food, then semi-liquid food, and finally even water and saliva. Treatment options for esophageal cancer include surgery, radiotherapy, and chemotherapy. Radical surgery can be considered if the patient is in good general condition, has good cardiopulmonary reserve, and no obvious signs of distant metastasis. However, in many cases in China, the tumor has already invaded multiple organs, making radical surgery impossible, and palliative radiotherapy and chemotherapy are the only options. Traditional radiotherapy has a long treatment cycle and is prone to complications such as esophageal perforation, fistula, radiation pneumonitis, and esophageal stricture. For patients who are unable to eat, palliative esophageal stenting is often the only option. However, esophageal stents can only open up the narrowed esophageal segment and have no therapeutic effect on the tumor.

[0004] Radioactive iodine-125 (I-125) particles are a type of brachytherapy used to treat malignant tumors and are currently widely used clinically. A novel treatment method has emerged: radioactive particles are coated onto an esophageal stent using a special technique, forming a brachytherapy stent. After implantation, this stent not only opens the esophageal stenosis but also delivers continuous low-dose irradiation from the I-125 particles, thus treating esophageal malignancies. This method significantly improves treatment efficacy, achieving two goals at once. However, this treatment method has some clinical drawbacks: First, the stent's mesh structure, after being applied to the lesion, can easily lead to the meshes combining with skin tissue and granulation tissue proliferation under prolonged support and expansion, causing restenosis. Second, if the tumor is highly sensitive to brachytherapy and shrinks significantly in a short period, the residual radiation dose from the particles can damage normal tissue, potentially leading to related complications. Third, esophageal tumors often grow unevenly within the lumen, but the dose coverage of the esophageal particle stent is cylindrical, resulting in uneven radiation dose received by the tumor. Fourth, esophageal particle stent implantation is only a palliative treatment, and the stent cannot be removed after implantation. Fifth, if esophageal particle implantation shifts, it means a shift in the particle dose. Not only can the therapeutic radionuclide not accurately target esophageal tumors for brachytherapy, but the shift can also easily cause radiation damage to the normal esophageal wall. Sixth, due to limitations in its covering technology, the radioactive particles are mostly dispersed and irregularly distributed on traditional covered stents. Different particle densities are applied according to their distribution sites, resulting in overall treatment instability, and more severely affected areas cannot be effectively treated. Summary of the Invention

[0005] To address the aforementioned problems, the purpose of this invention is to provide a composite kit for a nasoesophageal-tracheal fistula containing a three-balloon nasogastric feeding tube carrying radioactive particles.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] This utility model provides a nasoesophageal-tracheal fistula-borne radioactive particle three-balloon nasogastric tube composite kit, comprising: tube body, lower occlusion balloon, particle balloon, upper occlusion balloon, tube body docking structure, and nasal guiding structure;

[0008] The tube contains a nasogastric feeding channel and two tracheal channels. Near the front end of the tube, facing the rear end, are arranged a lower occlusion balloon, a particle balloon, and an upper occlusion balloon. Several food passages are opened at the front end of the tube and connect to the nasogastric feeding channel. The lower and upper occlusion balloons are connected to one of the tracheal channels, and the particle balloon is connected to the other tracheal channel. The lower and upper occlusion balloons are compliant balloons, while the particle balloon is a non-compliant balloon. The particle balloon is equipped with radioactive particles. The rear ends of the two tracheal channels extend outside the tube wall and are connected to tracheal interfaces.

[0009] The tube connection structure includes a handle and two compression and sealing knobs. The handle is thicker in the middle and thinner at both ends. The handle has a feeding channel for connecting to the nasogastric feeding channel, and a middle balloon air inlet channel and an upper and lower balloon air inlet channel for connecting to the two tracheal channels. The handle has external threads at both ends that are screwed together with the two compression and sealing knobs.

[0010] The transnasal guidance structure includes an outer sheath and a hook wire. The front end of the hook wire is a hook body, and the front end of the hook body is bent to form a hook tip. The hook wire is stored inside the outer sheath.

[0011] Furthermore, the particle capsule is cylindrical in the middle, and the two ends of the particle capsule are conical when connected to the tube body; on the surface of the cylindrical part of the particle capsule, there are several particle compartment strips integrally formed with the particle capsule, and radioactive particles are placed inside the particle compartment strips.

[0012] Furthermore, each particle chamber strip has several particle chambers, and each particle chamber contains radioactive particles; the particle chamber cavity is a cylindrical cavity, and a particle placement channel is opened at the front end of the cylindrical cavity of the particle chamber, the opening of the particle placement channel being smaller than the diameter of the radioactive particles.

[0013] Furthermore, the nasogastric tube is the main cavity, occupying most of the tube's diameter; the two tracheal tubes are symmetrically attached to the tube wall, occupying a smaller portion of the tube's diameter.

[0014] Furthermore, the tracheal interfaces extending beyond the tube wall at the rear end of the two tracheal channels are all one-way valve interfaces, and one of the tracheal interfaces connecting to the compliant balloon is also equipped with a pressure indicating balloon; a cap is provided at the rear end of the tube to block the nasogastric feeding channel.

[0015] Furthermore, length marking lines are provided on the surface of the tube.

[0016] Furthermore, a guide head is provided at the front end of the tube. The guide head is an elliptical cone head and is made of soft silicone.

[0017] Furthermore, a imaging ring is provided on the guide head.

[0018] Furthermore, the outer sheath is made of soft tubing, with an inner diameter similar to the outer diameter of the tube.

[0019] Furthermore, the hook wire is made of soft steel wire, and the rear end of the hook wire is the handle section.

[0020] This invention relates to a nasoesophageal-tracheoesophageal fistula-carrying three-balloon nasogastric tube composite kit. This kit provides both fistula sealing for patients with airway-esophageal fistulas and precise, targeted radiotherapy to esophageal cancer sites, while also facilitating the delivery of dietary nutrition. The device is simple in structure, easy to operate, highly efficient, and stable, making it suitable for widespread adoption. It effectively reduces patient suffering, is easy to install and disassemble, and exhibits significant therapeutic effects. It offers differentiated treatment, overall stability, and highly targeted treatment of airway-esophageal fistulas and esophageal cancer, making this nasogastric tube composite kit with radioactive particles a promising market prospect. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a structural diagram of the tube body of the nasoesophageal-tracheal fistula-containing three-balloon nasogastric tube composite kit containing radioactive particles.

[0023] Figure 2 This is an axial cross-sectional view of the front end of the tube body in the nasoesophageal-tracheal fistula-containing three-balloon nasogastric feeding tube composite kit containing radioactive particles, which is a novel utility model.

[0024] Figure 3 This is a cross-sectional view of the particle balloon in the nasoesophageal-tracheal fistula-containing three-balloon nasogastric tube composite kit of this utility model.

[0025] Figure 4 This is a radial cross-sectional view of the front end of the tube body in the nasoesophageal-tracheal fistula-carrying three-balloon nasogastric tube composite kit containing radioactive particles, which is a novel utility model.

[0026] Figure 5 This is an axial cross-sectional view of the rear end portion of the tube body in the nasoesophageal-tracheal fistula-carrying three-balloon nasogastric tube composite kit containing radioactive particles, which is a novel utility model.

[0027] Figure 6 This is a structural diagram of the tube body docking structure of the nasoesophageal-tracheal fistula-carrying three-balloon nasogastric tube composite kit containing radioactive particles.

[0028] Figure 7 This is a cross-sectional view of the tube body docking structure of the nasoesophageal-tracheal fistula-carrying three-balloon nasogastric tube composite kit containing radioactive particles in this utility model.

[0029] Figure 8This is a cross-sectional view of the nasal guiding structure in the nasoesophageal-tracheal fistula-carrying three-balloon nasogastric tube composite kit containing radioactive particles of this utility model.

[0030] The attached diagram is labeled as follows: 1. Tube body; 2. Lower occlusion balloon; 3. Particle balloon; 4. Upper occlusion balloon; 5. Nasogastric feeding channel; 6. Tracheal channel; 7. Radioactive particles; 8. Tracheal interface; 9. Handle; 10. Tightening and sealing knob; 11. Feeding channel; 12. Middle balloon air intake channel; 13. Upper and lower balloon air intake channels; 14. Outer sheath; 15. Hook wire; 16. Hook body; 17. Hook tip; 18. Particle compartment strip; 19. Particle compartment; 20. Particle placement channel; 21. Pressure indicator balloon; 22. Cap; 23. Guide head; 24. Imaging ring; 25. Food channel opening. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. 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 should fall within the protection scope of the present invention.

[0032] like Figures 1 to 8 As shown, this utility model provides a medical device that combines a nasogastric feeding tube with treatment for both fistula sealing in patients with airway-esophageal fistulas and precise targeted radiotherapy to esophageal cancer sites, while also facilitating the delivery of dietary nutrition to patients. This device has a simple structure, is easy to operate, has high working and operational efficiency, is stable, and is conducive to widespread adoption and promotion. It effectively reduces patient suffering, is easy to install and disassemble, has significant effects, provides differentiated treatment, is generally stable, and is a highly targeted treatment for airway-esophageal fistulas and esophageal cancer. This three-balloon nasogastric feeding tube composite kit carrying iodine-125 radioactive particles has broad market prospects.

[0033] This utility model's composite kit includes a tube body 1, a tube body docking structure, and a nasal guidance structure. The tube body 1 mainly consists of a three-balloon section at the front end and a docking section at the rear end. The tube body 1 is a three-channel tube, including a nasogastric feeding channel 5 and two tracheal channels 6. The nasogastric feeding channel 5 is the main cavity, occupying most of the tube diameter. The two tracheal channels 6 are symmetrically attached to the tube wall, occupying a smaller portion of the tube diameter. The total tube length is 35-45 cm, and the tube diameter is 6-14 cm. The front end of the tube body 1 has three balloons, including two occlusive balloons (front and rear) and a non-compliant balloon (molecular balloon 3). The rear end of the tube body 1 has two tracheal interfaces 8, both one-way valve type. One of these interfaces, used for inflating the compliant balloon, is also equipped with a pressure indicator balloon 21. The rear end of the tube body 1 has a nasogastric feeding channel interface with a cap 22.

[0034] The tube body 1 is a flexible tube 35-45cm long and 6-14Fr in diameter, with length markings on its surface. Tube body 1 has a three-lumen structure, including two tracheal channels 6 and one nasogastric feeding channel 5. The tracheal channels 6 are symmetrically attached to the tube wall, occupying a relatively small space. One of the two tracheal channels 6 is the tracheal channel between the two compliant balloons in the three balloons at the front of tube body 1, and the other is the tracheal channel between the middle non-compliant balloon in the three balloons at the front of tube body 1. The main channel is the nasogastric feeding channel 5, which occupies a larger space and serves as the channel for supplying food and nutrition to the patient.

[0035] At the front end of the tube body 1 is a guide head 23, an elliptical conical head made of soft silicone, which prevents damage to the lumen of the tube body 1 during insertion into the patient's esophagus or while it remains in the patient's stomach. The guide head 23 has a contrast ring 24, allowing the doctor to accurately determine the placement of the front end of the tube body 1 under the guidance of X-ray or CT imaging equipment. Behind the guide head 23 is the food passage opening 25, with an elliptical outlet. The elliptical shape ensures a large outlet within the relatively small tube diameter. The outlets are symmetrically distributed on both sides of the tube wall. Behind the nasogastric feeding passage outlet is the lower occlusion balloon 2, a compliant balloon designed to prevent food reflux. The flexibility and malleability of the compliant balloon allow it to perfectly adapt to the esophageal wall space for effective occlusion. Following the compliant balloon is the particle balloon 3, a non-compliant balloon. The particle balloon 3 has a diameter of 20-25 mm and a length of 40-80 mm. The particle balloon 3 is cylindrical in the middle, with conical ends connecting to the tube body 1. On the cylindrical surface of the particle balloon 3, eight particle chamber strips 18 are integrally formed and arranged vertically (along the axis of the tube body 1) at equal intervals. Each particle chamber strip 18 contains five particle chambers 19, each capable of holding five radioactive particles 7. The cavity of each particle chamber 19 is a 0.8 × 5 mm cylindrical cavity, with a particle placement channel 20 at its front end. The opening of the particle placement channel 20 is 0.2 mm wide. The opening of the particle placement channel 20 is smaller than the particle diameter to prevent particle slippage and loss after placement in the particle chamber 19. The design of the particle chamber 19 allows doctors to accurately load the required dose of particles according to the size of the patient's cancerous site for precise radiotherapy. The particle chamber 19 is attached to the outer layer of the balloon. The particle balloon 3 can accommodate all esophageal lumen diameters. The particle balloon 3 can be used for radiation therapy of cancerous sites and for closure of esophageal-airway fistulas. The posterior part of the particle balloon 3 is the upper occlusion balloon 4, which, like the lower occlusion balloon 2, is an compliant balloon. The compliance of the two occlusion balloons allows them to fit more closely to the esophageal cavity, providing a tight seal. This prevents the downward flow of esophageal fluids from the upper end of the esophagus from eroding the fistula, and also prevents refluxed chyme and gastric acid from the stomach from damaging the fistula or cancerous site. The upper and lower occlusion balloons share a common tracheal channel 6, which opens into the wall of the balloon in the middle. Because the upper and lower occlusion balloons share a common airway, they can expand and contract in accordance with the rhythm of esophageal contraction, changing size and achieving a better occlusion effect. This also effectively stabilizes the position of the particle balloon 3, preventing displacement of the particle balloon 3 from affecting the treatment site. The particle balloon 3 itself uses its own tracheal channel 6, which opens into the wall of the middle section of the particle balloon 3.

[0036] The tube body 1 has two external interfaces for tracheal channels 6 and a nasogastric feeding channel 5 at its rear end. The central part of the rear end of the tube body 1 is the interface for the nasogastric feeding channel 5. The interface has a cap 22. The cap 22 can prevent bacterial invasion, making it more hygienic, and can also prevent the reflux of gastric juice, making it more practical. Two ventilation tubes are symmetrically arranged on the outside of the tube body 1 at the tracheal channel interface. Each ventilation tube has a one-way air inlet valve at its tip. The valve body that supplies air to the upper and lower sealing balloons also has a pressure indicating balloon 21 at its rear. Since the upper and lower sealing balloons are compliant balloons, the balloon expansion coefficient is uncertain, so a pressure indicating balloon is provided to sense the air pressure status of the two compliant balloons. The particle balloon 3 is a non-compliant balloon, and the balloon expansion coefficient is constant, so no pressure indicating balloon is provided. This utility model adopts a scheme that combines the particle balloon 3 with the nasogastric tube, which solves the problems of difficult control of radiation dose, uneven radiation surface, and inability to remove it after placement. Since this invention targets patients with esophageal-airway fistulas or esophageal cancer, both of whom experience difficulty eating, this solution provides precise treatment while facilitating the supply of food and nutrition. The three-balloon design is novel and practical. The anterior and posterior compliant balloons facilitate precise positioning of the particle balloon 3, ensuring accurate radiation and better sealing of the esophagus, preventing the invasion of bodily fluids and food residue into the fistula or cancerous site. The middle non-compliant balloon can both seal the fistula and provide precise radiation therapy to the cancerous site.

[0037] The tube body 1 connection structure consists of a main body, a connector, a handle 9, and a compression and sealing knob 10. The main body of the tube body 1 is cylindrical, with a thickened section in the middle serving as the handle 9. The handle 9 is knurled to increase friction with the hand. The two slightly thinner sections of the main body have compression and sealing knobs 10. The compression and sealing knobs 10 are sleeve-shaped, with threads on the inner edge of the upper opening and an inwardly tapering inner diameter of the lower opening, which can compress the tube body 1 and the connector to create a tight seal. Two thin stainless steel tubes protrude from the main body in the middle of the tube body 1; one is shorter at both ends, and the other is longer at both ends, to prevent incorrect connection to the airways of the two tube bodies 1. The main channel in the middle is a stainless steel channel designed in the shape of the nasogastric tube 5 in the tube body 1, used to connect with the nasogastric tube 5 of the tube body 1. The three lumens of the tube body 1 each have their own docking partners. The feeding channel 11 docks with the nasogastric feeding channel 5, and the middle balloon air intake channel 12 and the upper and lower balloon air intake channels 13 dock with the two tracheal channels 6, so that the lumens are not connected to each other. The different lengths of the docking tubes can avoid the situation of incorrect docking of the tube body 1.

[0038] The transnasal guidance structure includes an outer sheath 14 and a hook wire 15. The outer sheath 14 is a flexible tube with an inner diameter similar to the outer diameter of the tube body 1 and a length of 15-25 cm. The hook wire 15 is a type of soft steel wire, approximately 5-10 cm longer than the outer sheath 14. The front end of the hook wire 15 is a hook body 16, and the hook tip 17 of the bent hook body 16, along with the hook wire 15, can be stored inside the outer sheath 14. The rear end of the hook wire 15 is a handle for easy handholding.

[0039] The steps for using the composite kit of this utility model are as follows:

[0040] 1. Open the package and take out the nasoesophageal airway fistula-loaded iodine-125 radioactive particle three-balloon nasogastric feeding tube composite kit.

[0041] 2. Based on the patient's condition, if the patient has an esophageal-airway fistula, this kit can be used directly; if the patient has esophageal cancer, the required radiation dose of particles can be filled into the particle chamber 19 of the particle capsule 3 in an operating room with protective measures, depending on the size and location of the cancerous area.

[0042] 3. With the help of instruments such as X-ray or CT, the three-balloon nasogastric tube is inserted into the designated position through the mouth.

[0043] 4. Cut the three-balloon nasogastric tube 10-20 cm from the anterior end and remove the nasal guide structure. Insert the hook wire 15 into the sheath, through the nasal cavity, and then pull the outer sheath 14 out through the oral cavity. Hook the hook wire 15 onto the cut section of the three-balloon nasogastric tube 1, and pull the hook wire 15 along with the three-balloon nasogastric tube 1 into the outer sheath 14. Pull the outer sheath 14 out from the outside of the nasal cavity, bringing the three-balloon nasogastric tube 1 out of the nasal cavity until the tube 1 in the pharynx is straight.

[0044] 5. Remove the connecting structure of tube body 1 and connect the two ends of tube body 1 that have been cut. Insert the three stainless steel tubes of the connecting structure of tube body 1 into the three lumens of the three-balloon tube body 1, tighten them, and then tighten the compression sealing knob 10. Connect the other end of tube body 1 in the same way. Pay attention to the length markings printed on tube body 1 to avoid incorrect connection of the tracheal channel 6.

[0045] 6. Connect the syringe to the external interface of the endotracheal channel 6 and inflate the balloon. Carefully observe the pressure indicator on the balloon 21 until the appropriate pressure is reached. When inflating the intermediate particle balloon 3, inflate the balloon with the appropriate amount of gas according to the pressure value marked on the balloon.

[0046] 7. Drip liquid onto both ends of the pipe connection structure to check for leaks. If the seal is not tight, tighten the sealing knob 10 repeatedly until it is properly sealed.

[0047] 8. Secure the tube body 1 with the nasogastric tube fixation device.

[0048] 9. Packaging materials can be disposed of as general medical waste.

[0049] The beneficial effects of this utility model are as follows:

[0050] 1. The combination of the particle balloon 3 and the nasogastric tube solves the problem of nutritional supply to esophageal cancer patients and patients with esophageal-airway fistulas who cannot receive nutrition through food. It provides precise treatment for patients while also solving the problem of dietary nutrition.

[0051] 2. The combination of radioactive particles 7 and the balloon solves the problem of particle fixation and unpredictable radiation levels in the treatment of esophageal cancer patients. Doctors can accurately calculate the required radiation dose based on the condition of the patient's affected area and fill the balloon with the necessary number of particles, thus enabling precise radiotherapy.

[0052] 3. The design features three balloons: two compliant occlusion balloons at the top and bottom, and one non-compliant balloon in the middle. The two occlusion balloons at the top and bottom can prevent the reflux of oral saliva, gastric acid, and gastric contents from eroding the fistula or cancerous site, while firmly fixing the position of the middle particle balloon 3, preventing particle displacement from damaging non-disease areas.

[0053] 4. The three-balloon approach can treat esophageal airway fistulas without loading particles, or it can be loaded with particles for precise radiotherapy of esophageal cancer patients.

[0054] 5. The combination of a three-balloon and nasogastric tube approach can ensure uninterrupted treatment for patients without affecting their dietary nutrition.

[0055] 6. The docking structure solves the problems of tube release during treatment and tube retention during treatment. After the particle balloon 3 is placed through the oral cavity, the tube is left in the patient's nasal cavity through the docking structure, which can leave it in place for a long time without affecting the patient's life and comfort.

[0056] 7. The transnasal guidance structure solves the problem of transferring the tube from the oral cavity to the nasal cavity, making the doctor's operation more convenient.

[0057] 8. The pressure indicator balloon 21 allows doctors to directly judge the pressure of the two closed balloons inside the esophagus from the outside, making it easier for doctors to judge the inflation of the balloons.

[0058] 9. The length markings on tube 1 make it easy for doctors to release tube 1 according to the markings, avoiding blind release.

[0059] 10. The imaging ring 24 of the guide head 23 at the front end of the tube body 1 facilitates the doctor's judgment of the release position of the tube body 1 based on imaging equipment such as X-ray or CT.

[0060] 11. The cap 22 of the nasogastric tube 5 is designed to prevent bacterial contamination from harming the patient.

[0061] 12. The one-way valve design of the vent effectively prevents gas leakage.

[0062] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A nasogastric-gastrostomy tube with radioactive seed triple balloon nasogastric tube composite kit, characterized in that, include: Tube body, lower occlusion balloon, particle balloon, upper occlusion balloon, tube body docking structure, transnasal guidance structure; The tube contains a nasogastric feeding channel and two tracheal channels. Near the front end of the tube, facing towards the rear end, are sequentially arranged a lower occlusion balloon, a particle balloon, and an upper occlusion balloon. Several food passages are located at the front end of the tube and communicate with the nasogastric feeding channel. The lower and upper occlusion balloons are each connected to one of the tracheal channels, and the particle balloon is connected to the other tracheal channel. The lower and upper occlusion balloons are compliant balloons, while the particle balloon is a non-compliant balloon. The particle balloon is equipped with radioactive particles. The rear ends of the two tracheal channels extend beyond the tube wall and are connected to tracheal interfaces. The tube body docking structure includes a handle and two clamping and sealing knobs. The handle is thicker in the middle and thinner at both ends. The handle has a feeding channel that docks with the nasogastric feeding channel. The handle also has a middle balloon air intake channel and an upper and lower balloon air intake channel that dock with the two tracheal channels. The handle has external threads at both ends that are screwed together with the two clamping and sealing knobs. The transnasal guiding structure includes an outer sheath and a hook wire. The front end of the hook wire is a hook body, and the front end of the hook body is bent to form a hook tip. The hook wire is housed inside the outer sheath.

2. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set according to claim 1, characterized in that, The particle capsule is cylindrical in the middle, and the two ends of the particle capsule that connect to the tube are conical. On the surface of the cylindrical part of the particle capsule, there are several particle compartment strips integrally formed with the particle capsule, and radioactive particles are placed in the particle compartment strips.

3. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 2, wherein, Each of the particle chambers has several particle chambers, and each particle chamber contains radioactive particles. The particle chamber cavity is a cylindrical cavity, and a particle placement channel is opened at the front end of the cylindrical cavity. The opening of the particle placement channel is smaller than the diameter of the radioactive particles.

4. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The nasogastric tube is the main cavity, occupying most of the space in the tube body; the two tracheal tubes are symmetrically attached to the tube body wall, occupying a smaller space in the tube body diameter.

5. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The two tracheal channels extend beyond the tube wall at their rear ends and are connected to one-way valve interfaces. One of the tracheal interfaces, which connects to the compliant balloon, is also equipped with a pressure-indicating balloon. The rear end of the tube is provided with a cap that blocks the nasogastric feeding channel.

6. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The tube body surface is provided with length marking lines.

7. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The tube body is provided with a guide head at its front end. The guide head is an elliptical cone head and is made of soft silicone.

8. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 7, wherein, The guide head is equipped with a imaging ring.

9. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The outer sheath is made of soft tubing, with an inner diameter similar to the outer diameter of the tube.

10. The naso-esophageal tracheal fistula brachytherapy seed carrying triple balloon nasogastric tube composite set of claim 1, wherein, The hook wire is made of soft steel wire, and the rear end of the hook wire is a handle.

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