An esophageal fistula occlusion stent and an esophageal fistula occlusion stent placing device

Abstract

The present application relates to the technical field of medical devices, in particular to an esophageal fistula occlusion stent and an esophageal fistula occlusion stent placement device. The esophageal fistula occlusion stent comprises a stent body, the two ends of the stent body in the axial direction are respectively provided with a first anti-falling part, the first anti-falling part is arranged around the stent body, extends along the radial direction of the stent body and is attached to the inner side wall of the esophagus, a first attachment surface for attaching to the esophageal wall is arranged around the first anti-falling part, and a first groove is arranged on the first attachment surface; a second anti-falling part is arranged on the outer circumferential surface of the middle part of the stent body, the second anti-falling part is arranged around the stent body in the direction away from the esophageal fistula, extends along the radial direction of the stent body and is attached to the inner side wall of the esophagus, a second attachment surface is arranged at the attachment position of the second anti-falling part and the inner side wall of the esophagus, and a second groove is arranged on the second attachment surface. In this way, the problem that the esophageal fistula occlusion stent is easy to fall off from the fixed position is solved.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and more specifically, to an esophageal fistula occlusion stent and an esophageal fistula occlusion stent placement device. Background Technology

[0002] An esophageal fistula is an abnormal passage between the esophagus and adjacent organs, the most common type being the tracheoesophageal fistula (TEF). A tracheoesophageal fistula is caused by esophageal developmental abnormalities or lesions, resulting in a fistula between the trachea and esophagus. It can be congenital or acquired and can be classified as tracheoesophageal fistula or bronchoesophageal fistula. Congenital tracheoesophageal fistulas are caused by congenital malformations of the esophagus and trachea, forming an abnormal passage between the trachea and esophagus; it is a common type of congenital esophageal atresia. Acquired fistulas are commonly seen in: advanced esophageal cancer, esophageal foreign bodies, tracheotomy damaging the posterior tracheal wall, chest trauma, instrument injuries (esophagoscopy), esophageal erosion, and specific infections.

[0003] For congenital tracheoesophageal fistula, surgical treatment is usually used. The surgery separates and closes the abnormal channel between the trachea and esophagus, thereby completely separating the trachea and esophagus.

[0004] Esophageal fistula occlusion stents are used for dilation treatment of esophageal, cardia, and anastomotic strictures, as well as for closure of esophageal fistulas. However, because the esophagus uses peristalsis to push food into the stomach, it is difficult for esophageal fistula occlusion stents to remain stably in the intended position for an extended period without slipping. Furthermore, for larger esophageal fistulas, before complete healing or closure, food, water, and esophageal secretions may enter and remain at the fistula site. Existing stents cannot drain these secretions, which hinders wound healing and may even worsen the wound. Summary of the Invention

[0005] To address the problem that esophageal fistula occlusion stents are prone to falling off from their fixed positions, this invention provides an esophageal fistula occlusion stent and an esophageal fistula occlusion stent placement device.

[0006] The first aspect of this application provides an esophageal fistula occlusion stent, comprising: a stent body, the stent body being cylindrical, the stent body having a central through hole extending along the central axis of the stent body and penetrating the stent body, and a first anti-dislodgement portion being provided at both ends of the stent body in the axial direction, the first anti-dislodgement portion being arranged around the stent body and extending in the radial direction of the stent body and fitting against the inner wall of the esophagus, the first fitting surface being provided around the first anti-dislodgement portion for fitting against the esophageal wall, the first fitting surface being provided with a first groove; and a second anti-dislodgement portion being provided on the outer peripheral surface of the middle part of the stent body, the second anti-dislodgement portion being arranged around the stent body in the direction away from the esophageal fistula, the second anti-dislodgement portion extending in the radial direction of the stent body and fitting against the inner wall of the esophagus, the second fitting surface being provided at the fitting point of the second anti-dislodgement portion against the inner wall of the esophagus, the second fitting surface being provided with a second groove.

[0007] In some embodiments, a first groove is provided around a first anti-detachment portion, and a second groove is provided along the extending direction of a second mating surface.

[0008] In some embodiments, a transition portion is further included for connecting the second anti-detachment portion and the bracket body, the transition portion extending along the tangential direction of the outer peripheral surface of the bracket body and connected to the side of the transition portion.

[0009] In some embodiments, the esophageal fistula occlusion stent further includes a liquid aspiration structure disposed on the side of the stent body facing the esophageal fistula. The liquid aspiration structure includes a first liquid aspiration portion, which has a liquid collection chamber. The first liquid aspiration portion extends along a direction perpendicular to the axis of the stent body. The first liquid aspiration portion can at least partially extend into the esophageal fistula. The first liquid aspiration portion is provided with a liquid inlet, through which liquid in the esophageal fistula can flow into the aspiration tube. The liquid inlets are evenly distributed on the outer peripheral surface of the first liquid aspiration portion.

[0010] In some embodiments, the esophageal fistula occlusion stent further includes an aspiration device, which includes a first negative pressure pump and a first suction tube connected to the first negative pressure pump. The inlet end of the first suction tube is disposed in the collection chamber, and the outlet end of the first suction tube extends to the patient's body through a central through hole.

[0011] In some embodiments, the esophageal fistula occlusion stent further includes an irrigation tube assembly and an irrigation pump. The irrigation tube assembly can pass through the suction tube and extend into the esophageal fistula. The irrigation pump is connected to the irrigation tube assembly and can pump irrigation fluid into the esophageal fistula through the irrigation tube assembly.

[0012] In some embodiments, the esophageal fistula occlusion stent further includes a channel tube, and the flushing tube assembly includes a delivery tube. The channel tube is disposed through the collection cavity, and the delivery tube can extend into the esophageal fistula through the channel tube. The inlet end of the delivery tube extends to the outside of the patient through a central through-hole, and the delivery tube can extend and retract along the extension direction of the channel tube.

[0013] In some embodiments, the esophageal fistula occlusion stent further includes a sponge assembly, which includes a first sponge body in the shape of a cylindrical tube. The outer diameter of the first sponge body matches the diameter of the esophageal fistula. The fluid delivery tube includes a spray section disposed within the first sponge body, and a plurality of spray nozzles are disposed on the outer peripheral wall of the spray section. The spray section is provided with a plurality of spray sections and is evenly distributed within the first sponge body.

[0014] In some embodiments, the sponge assembly further includes a second sponge body, and the suction device further includes a second suction tube. The second sponge body fills the central hole of the first sponge body. The second suction tube includes a suction section extending into the first sponge body. Suction ports are evenly distributed on the sidewall of the suction section. The second suction tube is connected to a second negative pressure pump to aspirate liquid that enters the second suction tube through the suction ports. The outlet end of the second suction tube extends to the patient's body through a central through-hole.

[0015] In some embodiments, the sponge assembly includes an extended state and a compressed state that is simultaneously compressed in the radial direction; a first sponge body is connected to a spray section, a second sponge body is connected to a suction section, and a delivery tube is connected to a second suction tube, so that the delivery tube and the second suction tube can move simultaneously along the extension direction of the channel tube; in the compressed state, the sponge assembly is disposed inside the channel tube; the delivery tube and the second suction tube can drive the sponge assembly through the channel tube into the esophageal fistula and change from the compressed state to the extended state.

[0016] The second aspect of this application also discloses an esophageal fistula occlusion stent placement device, including a flexible tube assembly, a detection assembly, a driving device, and the esophageal fistula occlusion stent described above. The esophageal fistula occlusion stent is made of elastic wire. The flexible tube assembly includes a probe unit and an extension tube connected in sequence. The probe unit includes a base, which is cylindrical and has multiple mounting holes that penetrate the base in the axial direction. The multiple mounting holes are spaced apart in the circumferential direction of the base. The detection assembly is used to monitor the status of the esophageal fistula occlusion stent and the surgical procedure. The driving device is connected to the esophageal fistula stent. The esophageal fistula and the detection assembly are configured to pass through the extension tube and pass through different mounting holes respectively.

[0017] To address the problem of esophageal fistula occlusion stents easily falling out of their fixed positions, this invention has the following advantages:

[0018] In the above technical solution, the stent body can be used to ensure the basic patency of the esophagus, allowing food and water to still enter the patient's stomach through the central opening. Meanwhile, to address the issue of stent displacement, the first anti-dislodgement part at both ends of the stent body and the second anti-dislodgement part in the middle of the stent body utilize the first and second grooves on them. By leveraging the peristalsis of the esophagus to push food (pushing food towards the stomach in a wave-like motion), the esophagus contracts inward. Utilizing the muscular elasticity of the esophagus, a portion of the esophagus can enter the first and second grooves during contraction. This means that each peristaltic movement of the esophagus simultaneously clamps the esophageal fistula occlusion stent. Compared to structures without grooves, the portion of the esophageal wall entering the grooves can simultaneously hold the esophageal fistula occlusion stent in place, preventing it from falling out of its predetermined position. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of an esophageal fistula occlusion stent according to one embodiment is shown;

[0020] Figure 2 A schematic cross-sectional view of an esophageal fistula occlusion stent according to one embodiment is shown.

[0021] Figure 3 A schematic diagram of the structure of an esophageal fistula occlusion stent placement device according to one embodiment is shown.

[0022] Reference numerals: 10-Staff body; 11-Central through hole; 20-First anti-dislodgement part; 21-First contact surface; 22-First groove; 30-Second anti-dislodgement part; 31-Second contact surface; 32-Second groove; 40-Transition part; 50-First suction part; 51-Collection chamber; 61-First suction tube; 62-Second suction tube; 70-Delivery tube; 80-Channel tube; 90-Sponge assembly; 91-First sponge body; 92-Second sponge body; 100-Esophageal fistula occlusion stent; 200-Hose assembly; 210-Seat; 220-Extension tube; 300-Detection assembly; 310-Camera; 320-Lighting lamp. Detailed Implementation

[0023] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, and are not intended to imply any limitation on the scope of the disclosure.

[0024] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances. In addition, the terms "installed", "set up", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0025] The first aspect of this application discloses an esophageal fistula occlusion stent 100, such as Figure 1-2As shown, the stent body 10 may include: a stent body 10, which is cylindrical in shape. The stent body 10 has a central through hole 11 extending along the central axis of the stent body 10 and penetrating the stent body 10. The stent body 10 has a first anti-dislodgement part 20 at both ends along the axial direction. The first anti-dislodgement part 20 is arranged around the stent body 10 and extends along the radial direction of the stent body 10 and fits against the inner wall of the esophagus. A first contact surface 21 for fitting against the esophageal wall is arranged around the first anti-dislodgement part 20. A first groove 22 is provided on the first contact surface 21. A second anti-dislodgement part 30 is arranged on the outer peripheral surface of the middle part of the stent body 10. The second anti-dislodgement part 30 is arranged around the stent body 10 in the direction away from the esophageal fistula. The second anti-dislodgement part 30 extends along the radial direction of the stent body 10 and fits against the inner wall of the esophagus. A second contact surface 31 is provided at the contact point between the second anti-dislodgement part 30 and the inner wall of the esophagus. A second groove 32 is provided on the second contact surface 31.

[0026] The above technical solutions are primarily applicable to benign esophagomediastinal fistulas, esophagopleural fistulas, or esophageal anastomotic fistulas. They are not applicable to fistulas caused by malignant esophageal tumors. The recommended fistula size is within 2 cm. Infection may or may not occur at the fistula site. The stent body 10 can be used to ensure basic patency of the esophagus, allowing food and water to still enter the patient's stomach through the central through-hole 11. Meanwhile, to address the issue of stent displacement, the first anti-dislodgement part 20 at both ends of the stent body 10 and the second anti-dislodgement part 30 in the middle utilize the first groove 22 and the second groove 32 on them. With the help of the peristalsis of the esophagus (pushing food towards the stomach in a wave-like motion), the esophagus contracts inward, and its own muscle elasticity allows part of the esophagus to enter the first groove 22 and the second groove 32 during contraction. Thus, each peristaltic movement of the esophagus simultaneously clamps the esophageal fistula occlusion stent 100. Compared to structures without grooves, the portion of the esophageal wall entering the grooves simultaneously acts to hold the esophageal fistula occlusion stent 100 in place, preventing it from falling out of its predetermined position.

[0027] It should be noted that the esophageal fistula occlusion stent 100 in the above technical solution can be a self-expanding bare stent made of elastic metal wire. The metal material can be nickel-titanium alloy, etc. In particular, for the first anti-dislodgement part 20 and the second anti-dislodgement part 30, if a bare stent design is adopted, this part can be embedded in the tissue, thereby further preventing the esophageal fistula occlusion stent 100 from shifting. However, bare stents also have certain problems. Therefore, a membrane can also be set on the metal wire base. The membrane can completely or partially cover the metal braided base. The membrane material can be selected from materials with good biocompatibility, such as silicone. The self-expanding stent made of elastic metal wire can be compressed to a small volume when not in place, thus facilitating its placement into the patient's esophagus through devices such as endoscopes. After reaching the esophageal fistula, it is released, allowing it to naturally expand radially to support and fix it in the patient's esophagus. Alternatively, elastic plastic materials, such as SEPS, can be used. SEPS is easy to remove, significantly improves dysphagia and quality of life, and reduces the number of dilation procedures required for patients with benign stenosis. Biodegradable materials can also be used, or production methods such as 3D printing can be employed; one or more of these methods can be selected and combined depending on the specific circumstances. For example, for the stent body 10, the side where the second anti-dislodgement part 30 is located can be integrally made of woven metal wire, while other parts can be made of a single rigid or flexible material to provide better support and fixation for other structures.

[0028] The esophageal fistula occlusion stent 100 in the above technical solution can be installed and placed in the patient's body with the help of an endoscope or specially designed related devices or equipment.

[0029] Meanwhile, multiple first grooves 22 on the first anti-dislodgement part 20 and multiple second grooves 32 on the second anti-dislodgement part 30 can be provided. Specifically, the shapes of the first groove 22 and the second groove 32 can be circular, strip-shaped, etc. For example, the first groove 22 or the second groove 32 can be set as small circular grooves, and further, they can be evenly distributed on the first anti-dislodgement part 20 and the second anti-dislodgement part 30, so that the setting of multiple grooves can achieve a better effect of preventing dislodgement. In order to prevent the esophageal fistula occlusion stent 100 from scratching the patient's esophagus, the various parts of the above-mentioned esophageal fistula occlusion stent 100 can be smoothly and evenly transitioned to prevent the formation of sharp corners or other structures. The illustrated structure is only for clear illustration of the structure of each part and is not a limitation of this application.

[0030] To achieve a better effect in preventing the esophageal fistula occlusion stent 100 from falling off, such as Figure 1-2As shown, in a preferred embodiment, the first groove 22 is disposed around the first anti-dislodgement part 20, and the second groove 32 is disposed along the extending direction of the second contact surface 31. The first groove 22 and the second groove 32 shown in the figure are strip-shaped and extend along the circumferential direction of the first anti-dislodgement part 20 and the second anti-dislodgement part 30, thereby maximizing the volume of the first groove 22 and the second groove 32. This allows more esophageal muscle tissue to enter the grooves during contraction, providing a greater clamping force and further preventing the esophageal fistula occlusion stent 100 from dislodging.

[0031] In some embodiments, such as Figure 1-2 As shown, to allow for a natural transition between the second anti-dislodgement portion 30 and the stent body 10, a transition portion 40 is also included to connect the second anti-dislodgement portion 30 and the stent body 10. The transition portion 40 extends along the tangential direction of the outer peripheral surface of the stent body 10 and is connected to the side of the transition portion 40. This prevents sharp edges from appearing in the structure of the esophageal fistula occlusion stent 100 and prevents scratching of the esophagus.

[0032] Before an esophageal fistula fully heals, it will contain a large amount of secretions, especially mucus secreted by the esophagus to facilitate the passage of food into the stomach. Furthermore, because the esophageal fistula is not a smooth structure, particularly in congenital tracheoesophageal fistulas, an abnormal branch sac remains in the esophagus after the connection between the esophagus and trachea is severed. This branch sac can retain considerable secretions or food residue that has entered through the esophagus. These substances will adversely affect the healing of the esophageal fistula, delaying wound healing and even leading to infection. To address this problem, such as... Figure 1-2 As shown, the esophageal fistula occlusion stent 100 also includes a liquid suction structure. The liquid suction structure is disposed on the side of the stent body 10 facing the esophageal fistula. The liquid suction structure includes a first liquid suction part 50, and a liquid collection chamber 51 is provided in the first liquid suction part 50. The first liquid suction part 50 extends along a direction perpendicular to the axis of the stent body 10. The first liquid suction part 50 can at least partially extend into the esophageal fistula. The first liquid suction part 50 is provided with a liquid inlet, through which the liquid in the esophageal fistula can flow into the suction tube. The liquid inlets are evenly distributed on the outer peripheral surface of the first liquid suction part 50.

[0033] Specifically, the support body 10 used to fix the first suction part 50 can be a solid plate structure or an arc-shaped plate, etc. With the help of a plate structure without through holes or perforations, this part can prevent food from flowing incorrectly into the esophageal fistula, while also providing relatively stable support for the first suction part 50. An inlet can be provided on the side wall of the collection cavity 51. Specifically, through holes penetrating the side wall of the first suction part 50 can be machined in the first suction part 50 using appropriate processing methods. Preferably, the inlet can also be formed by the natural perforations in the mesh woven structure. This results in a large number of inlets, evenly distributed, and without the need for additional processing. The numerous perforations naturally forming the inlets allow secretions to easily enter the collection cavity 51. By removing secretions and other impurities from the esophageal fistula, a favorable environment for wound treatment can be provided, thereby promoting natural wound healing.

[0034] To further remove secretions and other substances flowing from the esophageal fistula, such as Figure 1-2 As shown, the esophageal fistula occlusion stent 100 also includes a suction device, which includes a first negative pressure pump and a first suction tube 61 connected to the first negative pressure pump. The inlet end of the first suction tube 61 is located in the collection chamber 51, and the outlet end of the first suction tube 61 extends to the patient's body through the central through hole 11. Using the negative pressure generated by the first negative pressure pump, the negative pressure is transmitted to the collection chamber 51 through the first suction tube 61. Then, with the help of air pressure, secretions flowing out of the esophageal fistula are sucked into the collection chamber 51, and further, they are adsorbed out of the patient's body through the first suction tube 61.

[0035] Because an esophageal fistula is actually an abnormal wound or branching structure, secretions may accumulate inside. These secretions are difficult to drain naturally without external force, and prolonged lack of proper cleaning can damage the wound and hinder healing. Therefore, if... Figure 1-2 As shown, the esophageal fistula occlusion stent 100 in this application also includes a channel tube 80, and the flushing tube assembly includes a delivery tube 70. The channel tube 80 is disposed through the collection cavity 51. The delivery tube 70 can pass through the channel tube 80 and extend into the esophageal fistula. The inlet end of the delivery tube 70 extends to the outside of the patient through the central through hole 11. The delivery tube 70 can extend and retract along the extension direction of the channel tube 80.

[0036] The channel tube 80 can be a solid structure to prevent secretions entering the collection cavity 51 from flowing into the channel tube 80. The extendable delivery tube 70 can adjust its length into the esophageal fistula, thereby adjusting the position of its outlet. Using the outlet of the delivery tube 70 within the esophageal fistula, saline solution or cleaning medication can be sprayed into the fistula to cleanse the affected area and remove accumulated secretions. The flushing assembly may also include a flushing pump located outside the patient's body, connected to the inlet end of the delivery tube 70, for pumping cleaning fluid into the delivery tube 70. During flushing, the cleaning fluid, along with any accumulated secretions, flows out of the esophageal fistula and into the collection cavity 51, where it is also removed from the patient's body.

[0037] As a further implementation method, such as Figure 1-2 As shown, the esophageal fistula occlusion stent 100 also includes a sponge assembly 90, which includes a first sponge body 91. The first sponge body 91 is in the shape of a round tube, and the outer diameter of the first sponge body 91 matches the diameter of the esophageal fistula. The liquid delivery tube 70 includes a spray section disposed in the first sponge body 91, and multiple water spray nozzles are disposed on the outer peripheral wall of the spray section. Multiple spray sections are disposed and evenly distributed in the first sponge body 91.

[0038] A support structure can be provided on the inner side of the first sponge body 91 to prevent it from deforming after absorbing a large amount of liquid. The support structure can be a metal mesh similar to the support body 10, or a sponge or other structure that can recover its original shape after compression and deformation, thus providing support on the inner side of the first sponge body 91. The first sponge body 91 can be configured to match the inner diameter of the branch structure of the esophageal fistula. Through multiple spray nozzles, the sprayed cleaning liquid can first evenly wet the sponge, and then, under the action of the sponge, evenly spray it into the entire abnormal branch structure of the esophageal fistula, thereby thoroughly flushing the esophageal fistula. Furthermore, the expanded first sponge body 91 can support the abnormal branch structure caused by the esophageal fistula, promoting the discharge of secretions and other impurities. The first sponge body 91 is connected to the liquid delivery tube 70, allowing it to be adjusted in position within the esophageal fistula along with the liquid delivery tube 70.

[0039] Furthermore, such as Figure 1-2 As shown, the sponge assembly 90 also includes a second sponge body 92, and the suction device also includes a second suction tube 62. The second sponge body 92 fills the central hole of the first sponge body 91. The second suction tube 62 includes a suction section that extends into the first sponge body 91. Suction ports are evenly distributed on the side wall of the suction section. The second suction tube 62 is connected to a second negative pressure pump to aspirate the liquid that enters the second suction tube 62 through the suction ports. The outlet end of the second suction tube 62 extends to the patient's body through the central through hole 11.

[0040] The second sponge 92 provides support for the first sponge 91 and also absorbs the cleaning fluid and other liquids flowing out through the delivery tube 70, as well as the flushed secretions. The second suction tube 62 can suction out the cleaning fluid and secretions within the esophageal fistula, while the first suction tube 61 only needs to suction out any substances missed by the second suction tube 62, thus improving the efficiency of liquid suction. The second suction tube 62 can perform suction while the delivery tube 70 is operating, or it can perform suction after the delivery tube 70 has been operating for a period of time, preventing a large amount of cleaning fluid or medication from being suctioned out prematurely and affecting the cleaning effect.

[0041] To facilitate the insertion of the sponge assembly 90, the sponge assembly 90 includes an expanded state and a compressed state that is simultaneously compressed in the radial direction; the first sponge body 91 is connected to the spray section, the second sponge body 92 is connected to the suction section, and the liquid delivery pipe 70 is connected to the second suction pipe 62, so that the liquid delivery pipe 70 and the second suction pipe 62 can move simultaneously along the extension direction of the channel pipe 80; in the compressed state, the sponge assembly 90 is disposed inside the channel pipe 80; the liquid delivery pipe 70 and the second suction pipe 62 can drive the sponge assembly 90 through the channel pipe 80 into the esophageal fistula, and change from the compressed state to the expanded state.

[0042] By moving the second suction tube 62 and the delivery tube 70, the sponge assembly 90 can be pushed out of the channel tube 80. Once pushed out, the sponge assembly 90, no longer restricted by the channel tube 80, can naturally expand and fill the abnormal branch structure formed by the esophageal fistula. Alternatively, the first sponge body 91 and the second sponge body 92 can be configured as a continuous sponge strip wrapped around the second suction tube 62 and secured by means such as binding wire or clips. When it needs to be removed from the esophageal fistula, the binding wire is cut, and the sponge assembly 90, having lost its securing function, will naturally disperse, becoming a long, continuous sponge strip. This strip can then be pulled out of the channel tube 80 under the influence of the delivery tube 70 and the second suction tube 62. To facilitate removal, a guide structure is provided on the side of the channel tube 80 facing the esophageal fistula to prevent the sponge strip from getting stuck at the end of the channel tube 80.

[0043] In addition, as the esophageal fistula heals, the sponge assembly 90 can be gradually pulled out of the fistula to adapt to the healing process. For example, an adjustment line can be placed around the outside of the sponge assembly 90, and the diameter of the sponge assembly 90 can be adjusted by tightening or loosening the adjustment line. Alternatively, the guide structure provided on the side of the channel tube 80 facing the esophageal fistula can be used to partially pull the sponge assembly 90 into the channel tube 80 through the second suction tube 62 and the delivery tube 70 to adjust its length inside the esophageal fistula.

[0044] The second aspect of this application also discloses a device for placing an esophageal fistula occlusion stent 100, such as... Figure 3As shown, the esophageal fistula occlusion stent 100 includes a flexible tube assembly 200, a detection component 300, a driving device, and any one of the above-mentioned technical solutions. The esophageal fistula occlusion stent 100 is made of elastic wire. The flexible tube assembly 200 includes a probe unit and an extension tube 220 connected in sequence. The probe unit includes a base 210, which is columnar and has multiple mounting holes that penetrate the base 210 in the axial direction. The multiple mounting holes are spaced apart in the circumferential direction of the base 210. The monitoring component is used to monitor the status of the esophageal fistula occlusion stent 100 and the surgical procedure. The driving device is connected to the esophageal fistula occlusion stent 100. The esophageal fistula and the monitoring component are configured to pass through the extension tube 220 and pass through different mounting holes respectively. The flexible tube assembly 200 serves as a carrier for other components within the device. Due to the elongated structure of the esophagus, many components in the esophageal fistula occlusion stent 100 require relatively long connecting wires and tubes for insertion into the affected area. The extension tube 220 can enclose these connecting wires and tubes, facilitating insertion into the digestive tract while preventing tangling and ensuring smooth operation. The base 210, connected to the extension tube 220, supports the end portions of multiple components, such as the camera 310 and lighting lamp 320 of the monitoring component. Different mounting holes ensure the relatively fixed positions of these devices.

[0045] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes can be made in form and detail without departing from the scope of this disclosure.

Claims

1. An esophageal fistula occlusion stent, characterized in that, The esophageal fistula occlusion stent comprises: a stent body in a circular tube shape, the stent body being provided with a central through hole extending along a central axis of the stent body and penetrating through the stent body, two ends of the stent body in an axial direction being respectively provided with a first anti-falling part, the first anti-falling part being arranged around the stent body and extending along a radial direction of the stent body and being attached to an inner side wall of an esophagus, a first attachment surface for being attached to an esophageal wall being arranged around the first anti-falling part, the first attachment surface being provided with a first groove; an outer peripheral surface of a middle part of the stent body being provided with a second anti-falling part, the second anti-falling part being arranged around the stent body in a direction away from the esophageal fistula, the second anti-falling part extending along a radial direction of the stent body and being attached to the inner side wall of the esophagus, a second attachment surface being arranged at a position where the second anti-falling part is attached to the inner side wall of the esophagus, the second attachment surface being provided with a second groove, part of the esophagus being capable of entering the first groove and the second groove when being contracted, so that a clamping movement of the esophagus on the esophageal fistula occlusion stent occurs during each peristalsis process of the esophagus; the esophageal fistula occlusion stent further comprising a liquid suction structure arranged on a side of the stent body facing the esophageal fistula.

2. The esophageal fistula occlusion stent according to claim 1, wherein the first groove is arranged around the first anti-falling part, and the second groove is arranged along an extension direction of the second attachment surface.

3. The esophageal fistula occlusion stent according to claim 1, further comprising a transition part for connecting the second anti-falling part and the stent body, the transition part extending along a tangent direction of an outer peripheral surface of the stent body and being connected to a side of the transition part.

4. The esophageal fistula occlusion stent according to claim 1, wherein the liquid suction structure comprises a first liquid suction part, the first liquid suction part being provided with a liquid collecting cavity, the first liquid suction part extending along an axial direction perpendicular to the stent body, the first liquid suction part being capable of at least partially extending into the esophageal fistula, the first liquid suction part being provided with a liquid inlet, liquid in the esophageal fistula being capable of flowing into the liquid suction structure through the liquid inlet; the liquid inlets are uniformly distributed on an outer peripheral surface of the first liquid suction part.

5. The esophageal fistula occlusion stent according to claim 4, further comprising a suction device, the suction device comprising a first negative pressure pump and a first liquid suction tube in communication with the first negative pressure pump, an inlet end of the first liquid suction tube being arranged in the liquid collecting cavity, an outlet end of the first liquid suction tube extending to outside of a patient's body through the central through hole.

6. The esophageal fistula occlusion stent according to claim 5, further comprising a flushing tube assembly and a flushing pump, the flushing tube assembly being capable of penetrating through the liquid suction tube and extending into the esophageal fistula, the flushing pump being in communication with the flushing tube assembly and being capable of pumping flushing liquid into the esophageal fistula through the flushing tube assembly.

7. The esophageal fistula occlusion stent according to claim 6, ​ ​ ​ The esophageal fistula occlusion stent further comprises a channel pipe, the flushing pipe assembly comprises a liquid delivery pipe, the channel pipe is arranged through the liquid collecting cavity, the liquid delivery pipe can extend into the esophageal fistula through the channel pipe, the inlet end of the liquid delivery pipe extends to the outside of the patient through the central through hole, and the liquid delivery pipe can be extended and retracted along the extension direction of the channel pipe.

8. The esophageal fistula occlusion stent according to claim 7, wherein, The esophageal fistula occlusion stent further comprises a sponge assembly, the sponge assembly comprises a first sponge body, the first sponge body is in the shape of a circular tube, the outer diameter of the first sponge body matches the diameter of the esophageal fistula, the liquid delivery pipe comprises a spraying section arranged in the first sponge body, and a plurality of water spraying openings are arranged on the peripheral wall of the spraying section. The spraying section is arranged with a plurality of spraying sections and is uniformly distributed in the first sponge body.

9. The esophageal fistula occlusion stent according to claim 8, wherein, The sponge assembly further comprises a second sponge body, the suction device further comprises a second liquid suction pipe, the second sponge body is filled in the central hole of the first sponge body, the second liquid suction pipe comprises a liquid suction section extending into the first sponge body, the side wall of the liquid suction section is uniformly provided with a plurality of liquid suction openings, and the second liquid suction pipe is connected with a second negative pressure pump to suck the liquid into the second liquid suction pipe through the liquid suction openings; The outlet end of the second liquid suction pipe extends to the outside of the patient through the central through hole.

10. The esophageal fistula occlusion stent according to claim 9, wherein, The sponge assembly comprises an expanded state and a compressed state compressed in the radial direction at the same time; the first sponge body is connected with the spraying section, the second sponge body is connected with the liquid suction section, and the liquid delivery pipe is connected with the second liquid suction pipe, so that the liquid delivery pipe and the second liquid suction pipe can move in the extension direction of the channel pipe at the same time; In the compressed state, the sponge assembly is arranged in the channel pipe; the liquid delivery pipe and the second liquid suction pipe can drive the sponge assembly to extend into the esophageal fistula through the channel pipe and change from the compressed state to the expanded state.

11. An esophageal fistula occlusion stent placement device, comprising a hose assembly, a monitoring assembly, a driving device and the esophageal fistula occlusion stent according to any one of claims 1-10, and the esophageal fistula occlusion stent is made of elastic wire; The hose assembly comprises a probe unit and an extension pipe connected in sequence, the probe unit comprises a seat body, the seat body is in the shape of a column and is provided with a plurality of mounting holes penetrating through the seat body in the axial direction, and the mounting holes are arranged at intervals in the circumferential direction of the seat body; The monitoring assembly is used for monitoring the state of the esophageal fistula occlusion stent and the operation process; The driving device is connected with the esophageal fistula occlusion stent, and the esophageal fistula and the monitoring assembly are arranged to pass through the extension pipe and different mounting holes respectively. ​

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