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

Abstract

The invention 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 cancerous parts of esophageal cancer, and diet nutrition conveying of the patient is facilitated. 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] The invention relates to the field of medical devices, and in particular to a composite set of three-balloon nasogastric feeding tubes loaded with radioactive particles for nasoesophageal tracheal fistula. Background Art

[0002] Tracheoesophageal fistula is a relatively rare symptom in clinical practice. It is generally divided into congenital and acquired types. Most congenital tracheoesophageal fistulas are accompanied by congenital esophageal atresia, while the main causes of acquired tracheoesophageal fistulas are acquired trauma, tumors of the thyroid gland and esophagus, and iatrogenic injuries. Among them, iatrogenic injuries are more common after tracheotomy or endotracheal intubation. Although they are not common, they may be an important cause of serious complications and death, especially in patients with esophageal cancer or lung cancer. In the current treatment of patients with tracheoesophageal fistula, esophageal stents and tracheal stents have become an important treatment for tracheoesophageal fistulas. However, in the process of stent production and placement, many factors such as the size, location, and shape of the surrounding bronchi need to be fully considered, and the interventional physician's operating skills are also very tested. Problems in any link may result in poor results in blocking the fistula. Therefore, compared with surgical operations, traditional interventional treatments have more complications, such as stent displacement, breakage, inadequate closure of the fistula, and formation of new organisms in the lumen. In several studies using bronchial stents for esophageal tracheal fistula repair, the success rate of fistula closure was only 40% to 70%.

[0003] Esophageal cancer is a common digestive tract tumor. The typical symptom of esophageal cancer is progressive dysphagia. The early symptoms are often not obvious, but there may be varying degrees of discomfort when swallowing rough and hard food, including choking after swallowing food, burning, pricking or pulling and rubbing pain behind the sternum. The symptoms are sometimes mild and sometimes severe, and the patient's quality of life decreases. As the tumor grows, it is difficult to swallow dry food first, then semi-liquid food, and finally water and saliva cannot be swallowed. The treatment methods for esophageal cancer include surgery, radiotherapy and chemotherapy. If the patient is in good general condition, has good cardiopulmonary function reserve, and has no obvious signs of distant metastasis, radical surgery can be considered. However, in most cases in China or when they are treated, the tumor often locally invades multiple organs and loses the opportunity for radical surgery, and then only palliative radiotherapy and chemotherapy can be chosen. Traditional radiotherapy has a long cycle and is prone to complications such as esophageal perforation, fistula, radiation pneumonia, and esophageal stenosis. Patients who are unable to eat often only have the option of palliative esophageal stent implantation, but the esophageal stent can only open the narrow section of the esophagus and has no therapeutic effect on the tumor.

[0004] Radioactive 125I particles are a type of short-range radionuclide used to treat malignant tumors and are currently widely used in clinical practice. At present, a new treatment method has emerged, which is to use a special method to cover the radioactive particles on the outside of the esophageal stent to form a short-range radiotherapy stent. After implantation of this stent, it can not only open the esophageal stenosis segment, but also play the role of continuous low-dose irradiation of iodine-125 radioactive particles, thereby treating esophageal malignant tumors. This method greatly improves the effect of treatment and achieves two goals at one stroke. However, this treatment method has some defects in clinical practice, specifically: First, the mesh structure of the stent, after acting on the lesion, under the effect of long-term support and expansion, the mesh is easy to combine with the skin tissue, granulation tissue proliferates, and the stent recurs stenosis. Secondly, if the tumor is very sensitive to short-range radiotherapy and the tumor shrinks significantly in a short time, the residual particle radiotherapy dose will damage the normal tissue, leading to the possibility of related complications. Third, esophageal tumors often grow unevenly in the lumen, but the dose coverage of the esophageal particle stent is cylindrical, and the radiation dose received by the tumor is uneven. Fourth, esophageal particle stent implantation is only a palliative treatment, and after the stent is implanted, the stent cannot be removed. Fifth, if the esophageal particles are displaced after implantation, it means that the particle dose is displaced. Not only can the therapeutic nuclide not accurately perform close-range radiotherapy on esophageal tumors, but the displacement is also prone to radioactive damage to the normal esophageal wall. Sixth, due to the limitations of its coating process, the radioactive particles are mostly dispersed and irregularly distributed on traditional coated stents. Different density particle layouts are applied according to their distribution sites, resulting in overall treatment instability, and at the same time, more serious sites cannot be effectively treated. Summary of the invention

[0005] In order to solve the above problems, the object of the present invention is to provide a three-balloon nasogastric feeding tube composite set loaded with radioactive particles for nasoesophageal tracheal fistula.

[0006] The objective of the present invention is achieved through the following technical solutions: The present invention provides a composite set of three-balloon nasogastric feeding tubes for esophageal and tracheal fistulas loaded with radioactive particles, comprising: a tube body, a lower blocking balloon, a particle balloon, an upper blocking balloon, a tube body docking structure, and a nasal guide structure; A nasogastric feeding channel and two tracheal channels are provided in the tube body; a lower blocking balloon, a particle balloon, and an upper blocking balloon are sequentially provided on the tube wall near the front end of the tube body toward the rear end, a plurality of food channel openings are provided on the front end of the tube body to be connected with the nasogastric feeding channel, the lower blocking balloon and the upper blocking balloon are both connected with one of the tracheal channels, and the particle balloon is connected with the other tracheal channel, the lower blocking balloon and the upper blocking balloon are compliant balloons, and the particle balloon is a non-compliant balloon, and radioactive particles are provided on the particle balloon, and the rear ends of the two tracheal channels extend out of the tube wall of the tube body and are connected with a tracheal interface; The tube body docking structure includes a handle and two compression and closure knobs. The handle is thick in the middle and thin at both ends. A feeding channel for docking with the nasogastric feeding channel is provided in the handle. A middle balloon air inlet channel and upper and lower balloon air inlet channels for docking with two tracheal channels are provided in the handle. External threads are provided on both ends of the handle to be screwed and connected with the two compression and closure knobs. The transnasal guide structure includes an outer sheath and a hook wire. The front end of the hook wire is a hook body. The front end of the hook body is bent to form a hook tip. The hook wire is housed in the outer sheath.

[0007] Furthermore, the particle balloon is cylindrical in the middle, and the connecting parts of the two ends of the particle balloon and the tube body are conical; on the surface of the cylindrical part of the particle balloon, a plurality of particle bin strips are integrally formed with the particle balloon and arranged, and radioactive particles are placed in the particle bin strips.

[0008] Furthermore, each particle bin strip is provided with a plurality of particle bins, in which radioactive particles are placed; the particle bin cavity is a cylindrical cavity, a particle placement channel is provided at the front end of the particle bin cylindrical cavity, and the opening of the particle placement channel is smaller than the diameter of the radioactive particles.

[0009] Furthermore, the nasogastric feeding channel is the main cavity, occupying most of the space of the tube body; the two tracheal channels are symmetrically attached to the tube wall of the tube body, occupying a smaller space of the tube body.

[0010] Furthermore, the tracheal interfaces connected to the outside of the tube wall at the rear ends of the two tracheal channels are both one-way valve interfaces, and one of the tracheal interfaces connected to the compliance balloon is also provided with an air pressure indicating air bag; the rear end of the tube body is provided with a cover for blocking the nasogastric feeding channel.

[0011] Furthermore, a length marking line is provided on the surface of the tube body.

[0012] Furthermore, a guide head is provided at the front end of the tube body. The guide head is an elliptical conical head and is made of soft silicone material.

[0013] Furthermore, a developing ring is arranged on the guide head.

[0014] Furthermore, the outer sheath tube is made of soft tubing, and the inner diameter is equivalent to the outer diameter of the tube body.

[0015] Furthermore, the hook wire is a soft steel wire, and the rear end of the hook wire is a handle portion.

[0016] The three-balloon nasogastric feeding tube composite set with radioactive particles for nasoesophageal tracheal fistula of the present invention can not only treat the fistula of patients with esophageal fistula and perform precise targeted radiotherapy on the cancerous site of esophageal cancer, but also facilitate the delivery of dietary nutrition for patients. The medical device combined with the nasogastric feeding tube is simple in structure, easy to operate, high in working and operating efficiency, stable in operation, conducive to popularization and promotion, effectively relieves the pain of patients, is easy to install and disassemble, has obvious effect, differentiates treatment, is overall stable, and has strong targeted treatment of esophageal fistula and esophageal cancer. It has a broad market prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a structural diagram of the tube body part of the composite set of three-balloon nasogastric feeding tubes carrying radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 2 It is a structural axial section view of the front end portion of the tube body in the composite set of three-balloon nasogastric feeding tubes loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 3 It is a cross-sectional view of the particle balloon in the composite set of three-balloon nasogastric feeding tube loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 4 It is a radial cross-sectional view of the structure of the front end portion of the tube body in the composite set of three-balloon nasogastric feeding tubes carrying radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 5 It is a structural axial section view of the rear end portion of the tube body in the composite set of three-balloon nasogastric feeding tubes loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 6 It is a structural diagram of the tube body docking structure in the composite set of three-balloon nasogastric feeding tubes loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 7 It is a structural cutaway diagram of the tube body docking structure in the composite set of three-balloon nasogastric feeding tubes loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; Figure 8 It is a structural cutaway diagram of the nasal guide structure in the composite set of the three-balloon nasogastric feeding tube loaded with radioactive particles for nasoesophageal tracheal fistula of the present invention; The accompanying drawings are marked as follows: 1. tube body; 2. lower blocking balloon; 3. particle balloon; 4. upper blocking balloon; 5. nasogastric feeding channel; 6. tracheal channel; 7. radioactive particles; 8. tracheal interface; 9. handle; 10. pressing and closing knob; 11. feeding channel; 12. middle balloon air inlet channel; 13. upper and lower balloon air inlet channels; 14. outer sheath; 15. hook wire; 16. hook body; 17. hook tip; 18. particle bin strip; 19. particle bin; 20. particle placement channel; 21. air pressure indicating balloon; 22. cover; 23. guide head; 24. developing ring; 25. food channel opening. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0019] like Figures 1 to 8 As shown, the present invention provides a medical device combined with a nasogastric feeding tube that can not only block the fistula of patients with airway esophageal fistula and perform precise targeted radiotherapy on the cancerous site of esophageal cancer, but also facilitate the delivery of dietary nutrition for patients. The device has a simple structure, convenient operation, high working and operating efficiency, stable operation, and is conducive to popularization and promotion. It effectively relieves the pain of patients, is easy to install and disassemble, has obvious effects, differentiates treatment, is overall stable, and has strong targeted treatment of airway esophageal fistula and esophageal cancer. The three-balloon nasogastric feeding tube composite set with iodine-125 radioactive particles has broad market prospects.

[0020] The composite suit of the present invention includes a tube body 1, a tube body docking structure, a nasal guide structure, etc. The tube body 1 is mainly composed of a three-balloon part at the front end and a docking part at the rear end of the tube body 1. The tube body 1 is a three-channel tube body, 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 space of the tube diameter. The total tube length is 35-45cm, and the tube diameter is 6-14fr. Three balloons are arranged at the front end of the tube body 1, including two front and rear blocking balloons, which are compliant balloons; the middle balloon is a particle balloon 3, which is a non-compliant balloon. There are two tracheal interfaces 8 on the side wall at the rear end of the tube body 1, both of which are one-way valve interfaces, one of which is a compliant balloon air supply interface and is also equipped with an air pressure indicating airbag 21. There is a nasogastric feeding channel interface at the rear end of the tube body 1, and the interface has a cover 22.

[0021] The tube body 1 is a soft tube body with a length of 35-45cm and a diameter of 6-14Fr, and there is a length marking line on the surface of the tube body 1. The tube body 1 is a three-chamber structure, including two tracheal channels 6 and a nasogastric channel 5. The tracheal channels 6 are symmetrically attached to the tube wall and occupy a small space on the tube wall. The two tracheal channels 6, one is the tracheal channel 6 of the front and rear two compliant balloons of the three balloons at the front end of the tube body 1, and the other is the tracheal channel 6 of the middle non-compliant balloon of the three balloons at the front end of the tube body 1. The main channel is the nasogastric channel 5, which occupies a larger space of the tube diameter and serves as a food nutrition supply channel for the patient.

[0022] At the front end of the tube body 1, there is a guide head 23 in sequence. The guide head 23 is an elliptical conical head. The guide head 23 is made of soft silicone material, which can avoid the tube being placed in the patient's esophagus or the tube body 1 being retained in the patient's stomach to cause damage to the patient's lumen. The guide head 23 has a developing ring 24, and the doctor can accurately determine the position of the front end of the tube body 1 under the guidance of X-ray or CT developing equipment. Behind the guide head 23 is the food passage opening 25, and the outlet is elliptical. The elliptical shape ensures that a larger outlet can be left on a small diameter. The outlets are symmetrically distributed on both sides of the tube wall. Behind the outlet of the nasogastric feeding channel is the lower blocking balloon 2, which is a compliant balloon that plays a role in preventing food reflux. The softness and plasticity of the compliant balloon shape can perfectly adapt to the esophageal wall space and perform a good blocking. Behind the compliant balloon is a particle balloon 3, which is a non-compliant balloon. The particle balloon 3 has a diameter of 20-25mm and a length of 40-80mm. The particle balloon 3 is cylindrical in the middle, and the connecting parts of the two ends of the balloon and the tube body 1 are conical. On the surface of the cylindrical part of the particle balloon 3, 8 particle bin strips 18 are arranged vertically (axially of the tube body 1) at equal intervals and are integrally formed with the balloon. Each particle bin strip 18 is distributed with 5 particle bins 19, which can hold 5 radioactive particles 7. The cavity of the particle bin 19 is a 0.8×5mm cylindrical cavity, and there is a particle placement channel 20 at the front end of the cylindrical cavity. The opening of the particle placement channel 20 is 0.2mm wide. The opening of the particle placement channel 20 is smaller than the particle diameter, so that the particles will not slip and be lost after being placed in the particle bin 19. The design of the particle bin 19 makes it easy for doctors to load the required dose of particles according to the size of the patient's cancerous site for precise radiotherapy. The particle bin 19 is attached to the outer layer of the balloon. The particle balloon 3 can adapt to the diameter of all esophageal cavities. The particle balloon 3 can not only perform radiation therapy on the cancerous site, but also block the esophageal airway fistula. The rear part of the particle balloon 3 is an upper blocking balloon 4, which is a compliance balloon like the lower blocking balloon 2. The compliance of the upper and lower blocking balloons is more suitable for the interior of the esophageal cavity, and is tightly sealed, which not only avoids the erosion of the fistula by the downward flow of body fluid at the upper end of the esophagus, but also avoids the infringement of the fistula or cancerous part by the food acid of gastric reflux. Among them, the upper and lower blocking balloons share a tracheal passage 6, and the tracheal passage 6 opens on the tube wall in the middle of the air balloon respectively. Since the upper and lower blocking balloons share an airway, the upper and lower blocking balloons can shrink with the regular contraction of the esophagus, and the size changes, which plays a better blocking effect, and also plays a good fixing effect on the position of the particle balloon 3, avoiding the influence of the displacement of the particle balloon 3 on the treatment part. The particle balloon 3 has a tracheal passage 6 for itself, and the tracheal passage 6 opens on the tube wall in the middle of the particle balloon 3.

[0023] The rear end of the tube body 1 has two external interfaces of the tracheal channel 6 and the external interface of the nasogastric channel 5. The central part of the rear end of the tube body 1 is the interface part of the nasogastric channel 5. The interface part has a cover 22. The cover 22 can avoid the invasion of bacteria, which is more hygienic, and can also avoid the reflux of gastric juice, etc., which is more practical. Two ventilation tubes are symmetrically arranged outside the tube body 1 of the tracheal channel interface, and the tube heads of the ventilation tubes are all provided with one-way air inlet valves, wherein the rear part of the valve body for supplying air to the upper and lower blocking balloons is also provided with an air pressure indicating balloon 21. Since the upper and lower blocking balloons are compliant balloons, the balloon expansion coefficient is uncertain, so an air pressure indicating balloon is provided to sense the air pressure conditions of the two compliant balloons. The particle balloon 3 is a non-compliant balloon, and the balloon expansion coefficient is constant, so the air pressure indicating balloon is not provided. The present invention adopts a solution combining the particle balloon 3 with the nasogastric tube to solve the problems of poor control of radiation dose, uneven radiation surface, and inability to be removed after placement. Since the present invention is aimed at patients with esophageal airway fistula or esophageal cancer, both of which will have difficulty eating, this solution provides patients with more convenient food nutrition supply while giving them precise treatment. The three-balloon design is more novel and practical. The front and rear double-compliant balloons are conducive to fixing the position of the particle balloon 3, making the radiation more accurate and correct, and more conducive to the front and rear blocking of the esophagus, avoiding the invasion of body fluids, food residues, etc. on the fistula or cancerous site. The middle non-compliant balloon can not only block the fistula, but also accurately radiate the cancerous site.

[0024] The docking structure of the tube body 1 is composed of a main body, a docking joint, a handle 9, a clamping and closing knob 10, etc. The main body of the tube body 1 is cylindrical, and the thickened part in the middle is the handle 9, and the handle 9 is engraved with knurling to increase the friction with the hand. There are clamping and closing knobs 10 at the slightly thinner parts at both ends of the main body. The clamping and closing knob 10 is sleeve-shaped, with threads on the inner edge of the upper opening, and the inner diameter of the lower opening part is restrained, which can squeeze the tube body 1 and the joint to make it airtightly connected. There are two stainless steel thin tubes in the middle of the tube body 1, protruding outside the main body, one with shorter ends and one with longer ends, which can avoid connecting the wrong airways of the tube body 1 on both sides. The main channel in the middle is a stainless steel channel designed in the shape of the nasogastric channel 5 in the tube body 1, which is used to dock the nasogastric channel 5 of the tube body 1. The three lumens of the docking joint of the tube body 1 each have its own docking object. The feeding channel 11 is docked with the nasogastric feeding channel 5, and the middle balloon air inlet channel 12 and the upper and lower balloon air inlet channels 13 are docked 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 where the tube body 1 is docked incorrectly.

[0025] The transnasal guide structure includes an outer sheath tube 14 and a hook wire 15. The outer sheath tube 14 is a soft tube. The inner diameter is equivalent to the outer diameter of the tube body 1, and the length is 15-25cm. The hook wire 15 is a soft steel wire, which is about 5-10cm longer than the outer sheath tube 14. The front end of the hook wire 15 is a hook body 16. After the hook body 16 is bent, the hook tip 17 and the hook wire 15 can be stored in the outer sheath tube 14. The rear end of the hook wire 15 is a handle, which is easy to hold.

[0026] The steps of using the composite suit of the present invention are as follows: 1. Open the package and take out the three-balloon nasogastric feeding tube complex set loaded with iodine-125 radioactive particles for nasoesophageal airway fistula.

[0027] 2. According to the patient's condition, if the patient has esophageal airway fistula, this suit can be used directly; if the patient has esophageal cancer, the particles of the required radiation dose can be loaded into the particle chamber 19 of the particle balloon 3 in an operating room with protective measures according to the size and location of the cancerous site.

[0028] 3. With the help of instruments such as X-ray or CT, place the three-balloon nasogastric tube into the designated position through the mouth.

[0029] 4. Cut off the front part of the three-balloon nasogastric feeding tube at 10-20CM from the tail end, and remove the transnasal guide structure. Insert the hook wire 15 into the sheath tube, pass it through the nasal cavity, and then pull out the outer sheath tube 14 from the oral cavity. Hook the cut three-balloon nasogastric feeding tube body 1 with the hook wire 15, pull the hook wire 15, and pull the hook wire 15 together with the three-balloon nasogastric feeding tube body 1 into the outer sheath tube 14. Pull out the outer sheath tube 14 from the outside of the nasal cavity, and bring out the three-balloon nasogastric feeding tube body 1 to the outside of the nasal cavity until the pharyngeal tube body 1 is straight.

[0030] 5. Take out the butt joint structure of the tube body 1 and butt joint the two ends of the cut tube body 1. Insert the three stainless steel tubes of the butt joint structure of the tube body 1 into the three chambers of the three-balloon tube body 1, and tighten the closing knob 10 after inserting it. Connect the other end of the tube body 1 in the same way. Pay attention to the length scale line printed on the tube body 1 to avoid connecting the tracheal channel 6 incorrectly.

[0031] 6. Connect the external interface of the tracheal passage 6 with a syringe to inflate the balloon, and pay attention to the pressure indication of the air pressure indicating balloon 21 until the appropriate air pressure is reached. When inflating the intermediate particle balloon 3, fill it with an appropriate amount of gas according to the air pressure value marked on the balloon.

[0032] 7. Drip liquid on both ends of the pipe docking structure and check for leaks. If the seal is not tight, repeatedly tighten the sealing knob 10 until the seal is intact.

[0033] 8. Use the nasogastric tube fixing device to fix the tube body 1.

[0034] 9. The packaging can be treated as general medical waste.

[0035] The beneficial effects of the present invention are: 1. The combination of particle balloon 3 and nasogastric feeding tube solves the problem that patients with esophageal cancer and esophageal airway fistula cannot get nutrition through diet. It not only provides precise treatment for patients, but also solves the problem of dietary nutrition supply for patients.

[0036] 2. The combination of radioactive particles 7 and balloons solves the problem that particles cannot be fixed and radiation values ​​cannot be mastered when treating esophageal cancer patients. Doctors can accurately calculate the required radiation dose to fill the required number of particles according to the condition of the patient's affected area, thereby performing precise radiotherapy.

[0037] 3. The three-balloon design includes two upper and lower compliant blocking balloons and a non-compliant balloon in the middle. The upper and lower blocking balloons can prevent oral fluid, gastric acid and gastric contents from reflux and erosion of fistula or cancerous sites, and firmly fix the position of the middle particle balloon 3, avoiding damage to non-diseased sites caused by particle displacement.

[0038] 4. The three-balloon approach can be used to treat esophageal-airway fistula without loading particles, or it can be used to perform precise radiotherapy on patients with esophageal cancer by loading particles.

[0039] 5. The combination of three balloons and nasogastric tube can ensure uninterrupted treatment for patients without affecting their dietary nutrition supply.

[0040] 6. The docking structure solves the problem of tube release during treatment and tube retention during treatment. After the particle balloon 3 is placed through the mouth, the tube is retained in the patient's nasal cavity through the docking structure and can be retained for a long time without affecting the patient's life and feelings.

[0041] 7. The transnasal guide structure solves the problem of transferring the tube from the oral cavity to the nasal cavity, making it easier for doctors to operate.

[0042] 8. The air pressure indicating balloon 21 can help doctors directly judge the air pressure of the upper and lower closed balloons in the esophagus from the outside, making it easier for doctors to judge the filling of the balloons.

[0043] 9. The length marking line of the tube body 1 makes it convenient for the doctor to release the tube body 1 according to the marking scale line, thus avoiding blind release.

[0044] 10. The developing ring 24 of the guiding head 23 at the front end of the tube body 1 facilitates the doctor to judge the release position of the tube body 1 according to developing equipment such as X-ray or CT.

[0045] 11. The cover 22 design of the nasogastric feeding channel 5 avoids the harm of bacterial contamination to the patient.

[0046] 12. The one-way valve design of the vent effectively avoids gas leakage.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles, characterized in that: include: Tube body, lower blocking balloon, particle balloon, upper blocking balloon, tube body docking structure, and transnasal guiding structure; A nasogastric feeding channel and two tracheal channels are provided in the tube body; a lower blocking balloon, a particle balloon, and an upper blocking balloon are sequentially provided on the tube wall near the front end of the tube body toward the rear end, a plurality of food passage openings are provided on the front end of the tube body to communicate with the nasogastric feeding channel, the lower blocking balloon and the upper blocking balloon are both connected to one of the tracheal channels, and the particle balloon is connected to another of the tracheal channels, the lower blocking balloon and the upper blocking balloon are compliant balloons, and the particle balloon is a non-compliant balloon, and radioactive particles are provided on the particle balloon, and the rear ends of the two tracheal channels extend out of the tube wall of the tube body and are connected to tracheal interfaces; The tube body docking structure includes a handle and two compression and sealing knobs. The handle is thick in the middle and thin at both ends. A feeding channel for docking with the nasogastric feeding channel is provided in the handle. An intermediate balloon air inlet channel and upper and lower balloon air inlet channels for docking with the two tracheal channels are provided in the handle. External threads are provided on both ends of the handle to be screwed and connected with the two compression and sealing knobs. The transnasal guiding structure comprises an outer sheath tube and a hook wire, the front end of the hook wire is a hook body, the front end of the hook body is bent to form a hook tip, and the hook wire is accommodated in the outer sheath tube.

2. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The particle balloon is cylindrical in the middle, and the connecting parts of the two ends of the particle balloon and the tube body are conical; a plurality of particle bin strips are arranged on the surface of the cylindrical part of the particle balloon, which are integrally formed with the particle balloon, and radioactive particles are placed in the particle bin strips.

3. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 2, characterized in that: Each particle bin strip is provided with a plurality of particle bins, wherein radioactive particles are placed in the particle bins; the particle bin cavity is a cylindrical cavity, and a particle placement channel is provided at the front end of the particle bin cylindrical cavity, and the opening of the particle placement channel is smaller than the diameter of the radioactive particles.

4. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The nasogastric feeding channel is the main cavity, occupying most of the space of the tube body; the two tracheal channels are symmetrically attached to the tube wall of the tube body, occupying a smaller space of the tube body.

5. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The tracheal interfaces connected to the outside of the tube wall at the rear ends of the two tracheal channels are both one-way valve interfaces, one of which is connected to the compliance balloon and is also provided with an air pressure indicating balloon; the rear end of the tube body is provided with a cover for blocking the nasogastric feeding channel.

6. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The surface of the tube body is provided with a length marking line.

7. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: A guide head is arranged at the front end of the tube body. The guide head is an elliptical conical head and is made of soft silicone material.

8. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 7, characterized in that: A developing ring is arranged on the guide head.

9. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The outer sheath tube is a soft tube, and the inner diameter thereof is equivalent to the outer diameter of the tube body.

10. The three-balloon nasogastric feeding tube composite set for nasoesophageal tracheal fistula loaded with radioactive particles according to claim 1, characterized in that: The hook wire is a soft steel wire, and the rear end of the hook wire is a handle.

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