Esophageal stent

Abstract

This utility model discloses an esophageal stent, including a stent body with a channel for food flow. The esophageal stent also includes a blocking structure disposed within the channel to prevent food reflux. The blocking structure includes a first valve and a second valve fixedly disposed on opposite sides within the channel. An intersection is formed between adjacent ends of the first and second valves, and the intersection has first and second states. When food refluxes to the blocking structure, the intersection is in the first state, where it is in a cross-positioned state to block the channel. When normal food flows to the blocking structure, the intersection is in the second state, where the cross-positioning disengages to allow the channel to flow freely. This esophageal stent can prevent stomach food and digestive juices from flowing back into the esophagus and causing vomiting or reflux esophagitis without affecting normal eating. It can also change the patient's sleeping position, allowing for better rest and facilitating recovery.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, specifically to an esophageal stent. Background Technology

[0002] Esophageal stents are used for dilation treatment of esophageal, gastric cardia, and anastomotic strictures, as well as for closure of esophageal fistulas. In normal individuals, after eating, the cardia sphincter at the junction of the esophagus and stomach closes, preventing food reflux into the esophagus and causing vomiting. However, in cases of stricture at the junction of the esophagus and stomach, the insertion of an esophageal stent can damage the cardia sphincter, causing food to reflux due to gastric peristalsis. Food may pass through the stent into the mouth, causing vomiting and potentially even esophagitis, leading to discomfort. To prevent reflux, patients often have to lie on an inclined bed, which is uncomfortable and prevents proper rest, thus hindering recovery. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing an esophageal stent that can prevent food reflux without affecting normal eating.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] An esophageal stent includes a stent body having a channel for food flow. The esophageal stent also includes a blocking structure disposed within the channel to prevent food reflux. The blocking structure includes a first valve and a second valve fixedly disposed on opposite sides within the channel. An intersection is formed between adjacent ends of the first and second valves. The intersection has a first state and a second state. When food refluxes to the blocking structure, the intersection is in the first state, where it is in a cross-positioned state to block the channel. When normal food flows to the blocking structure, the intersection is in the second state, where the cross-positioning of the intersection disengages to allow the channel to flow freely.

[0006] In some implementations, both the first and second valves are made of an elastic material, such that the intersection of the first and second valves is in a first state in its natural state.

[0007] In some implementations, the first valve includes a first body portion, the second valve includes a second body portion, and the cross portion includes a first ratchet tooth disposed at one end of the first body portion and a second ratchet tooth disposed at one end of the second body portion;

[0008] The first ratchet is provided with a plurality of teeth spaced apart along the end of the first main body, and the interval between two adjacent first ratchet teeth forms a first tooth groove; the second ratchet is provided with a plurality of teeth spaced apart along the end of the second main body, and the interval between two adjacent second ratchet teeth forms a second tooth groove.

[0009] When the cross portion is in the first state, the first ratchet is inserted into the second tooth groove, and the first ratchet extends to the lower part of the second main body portion; the second ratchet is inserted into the first tooth groove, and the second ratchet extends to the lower part of the first main body portion.

[0010] When the cross portion is in the second state, the first ratchet tooth disengages from the second tooth groove, and the second ratchet tooth disengages from the first tooth groove.

[0011] In some implementations, both the first valve and the second valve have a downwardly curved arc structure.

[0012] In some implementations, the first valve has a first sidewall connected to the inner sidewall of the stent body, the first sidewall being located at the other end of the first body portion and above the first ratchet; the second valve has a second sidewall connected to the inner sidewall of the stent body, the second sidewall being located at the other end of the second body portion and above the second ratchet.

[0013] In some implementations, the main body of the support is a spiral tubular structure.

[0014] In some implementations, the esophageal stent further includes an anchoring portion fixedly disposed on the stent body. Multiple anchoring portions are spaced apart along the circumferential direction of the stent body, and each anchoring portion protrudes outward from the outer circumferential surface of the stent body.

[0015] In some implementations, each of the anchoring portions is inclined in the opposite direction of the spiral direction of the support body from the outer circumference of the support body.

[0016] In some implementations, the anchoring part is located at the upper end of the support body, and the anchoring part is a tapered structure with the small end facing outward.

[0017] In some implementations, the support body is made of an elastic material, allowing it to contract and expand in a helical direction; or, the support body is made of a shape memory alloy material.

[0018] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: In the esophageal stent of this utility model, the blocking structure forms a one-way valve-like structure in the channel of the stent body. When food refluxes to the blocking structure, the cross-section is in a cross-setting state, thereby blocking the channel of the stent body and preventing food from refluxing through the channel of the stent body into the oral cavity; while during normal eating, when food flows to the blocking structure, the cross-setting of the cross-section disengages, thereby making the channel of the stent body unobstructed, and food can enter the stomach through the channel of the stent body. In this way, the esophageal stent can prevent stomach food and digestive juices from flowing back into the esophagus and causing vomiting and reflux esophagitis without affecting normal eating, and can also change the patient's sleeping position to allow the patient to rest better, which is more conducive to the patient's recovery. Attached Figure Description

[0019] Appendix Figure 1 This is one of the three-dimensional schematic diagrams of the esophageal stent in this embodiment;

[0020] Appendix Figure 2 This is the second three-dimensional schematic diagram of the esophageal stent in this embodiment;

[0021] Appendix Figure 3 This is a front view of the esophageal stent in this embodiment;

[0022] Appendix Figure 4 This is a top view (enlarged view) of the esophageal stent in this embodiment;

[0023] Appendix Figure 5 This is one of the three-dimensional schematic diagrams of the blocking structure in this embodiment;

[0024] Appendix Figure 6 This is the second perspective view of the blocking structure in this embodiment;

[0025] Appendix Figure 7 This is a front view of the blocking structure in this embodiment;

[0026] Appendix Figure 8 This is a top view of the blocking structure in this embodiment.

[0027] Wherein: 1. Support body; 2. Blocking structure; 21. First valve; 211. First main body; 212. First ratchet; 213. First tooth groove; 214. First sidewall; 22. Second valve; 221. Second main body; 222. Second ratchet; 223. Second tooth groove; 224. Second sidewall; 3. Anchoring part. Detailed Implementation

[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] like Figures 1-4 As shown, the esophageal stent of this utility model includes a stent body 1 and a blocking structure 2.

[0031] like Figures 1-3 As shown, the main body 1 of the support is a spiral tubular structure, and the inner cavity of the tubular structure forms a channel for food to flow through.

[0032] The stent body 1 needs to have a certain degree of rigidity so that the esophageal stent can be stably placed in the patient's body without deformation during use. The stent body 1 can be made of an elastic material, allowing it to contract in a spiral direction when the esophageal stent is inserted into and removed from the patient's body; conversely, when the esophageal stent is inserted into the patient's body, the stent body 1 can expand in a spiral direction to support the esophagus, cardia, or anastomotic narrowing in the patient's body, thereby opening up the corresponding area in the patient's body to facilitate eating. The stent body 1 can also be made of an elastic metal material.

[0033] The main body of the support can also be made of shape memory alloy material.

[0034] A blocking structure 2 is disposed within the channel of the support body 1 to prevent food reflux. Specifically, the blocking structure 2 includes a first valve 21 and a second valve 22, which are fixedly disposed on opposite sides within the channel of the support body 1. Adjacent ends of the first valve 21 and the second valve 22 have an intersection. The intersection has a first state and a second state. When the intersection is in the first state, it is in a crossed configuration. When the intersection is in the second state, the crossed configuration is disengaged, meaning the first valve 21 and the second valve 22 are separated.

[0035] When the patient eats normally, food flows from top to bottom. When the food reaches the blocking structure 2, the crossing section is in a second state under the influence of gravity, meaning the first valve 21 and the second valve 22 are separated. This keeps the channel of the stent body 1 open, allowing food to flow smoothly through the blocking structure 2 without affecting the patient's normal eating. When food refluxes, it flows from bottom to top. When the food refluxes to the blocking structure 2, the crossing section is in a first state under the influence of the reflux force, meaning the first valve 21 and the second valve 22 are crossed, thus blocking the channel of the stent body 1 and preventing food from refluxing through the blocking structure 2, thereby achieving the effect of preventing food reflux.

[0036] In this embodiment, the first valve 21 includes a first main body portion 211, the second valve 22 includes a second main body portion 221, and the crossing portion includes a first ratchet 212 disposed at one end of the first main body portion 211 and a second ratchet 222 disposed at one end of the second main body portion 221. Multiple first ratchet teeth 212 are spaced apart along the end of the first main body portion 211, and the interval between two adjacent first ratchet teeth 212 forms a first tooth groove 213. Multiple second ratchet teeth 222 are spaced apart along the end of the second main body portion 221, and the interval between two adjacent second ratchet teeth 222 forms a second tooth groove 223.

[0037] When the cross portion is in the first state, the first ratchet 212 is inserted into the second tooth groove 223, and the first ratchet 212 extends to the lower part of the second main body 221. The second ratchet 222 is inserted into the first tooth groove 213, and the second ratchet 222 extends to the lower part of the first main body 211, thereby making the first valve 21 and the second valve 22 cross-connected. Figures 4-8 As shown.

[0038] When the cross section is in the second state, the first ratchet 212 disengages from the second tooth groove 223, and the second ratchet 222 disengages from the first tooth groove 213, thereby separating the first valve 21 and the second valve 22 from each other.

[0039] When both the first ratchet 212 and the second ratchet 222 move downwards, the cross arrangement of the cross portion can be disengaged. When both the first ratchet 212 and the second ratchet 222 move upwards, the cross arrangement of the cross portion cannot be disengaged due to the obstruction of the first main body 211 and the second main body 221.

[0040] In this embodiment, both the first valve 21 and the second valve 22 are made of elastic material, such that the intersection of the first valve 21 and the second valve 22 is in a first state in a natural state.

[0041] When food flows to the blocking structure 2 during normal ingestion, the weight of the food exerts a downward force, causing the first valve 21 and the second valve 22 to elastically deform. Both the first ratchet 212 and the second ratchet 222 move downwards, causing the first ratchet 212 to disengage from the second groove 223 and the second ratchet 222 to disengage from the first groove 213, thus separating the first valve 21 and the second valve 22, placing the crossing portion in a second state. When food flows past the blocking structure 2, the first valve 21 and the second valve 22 regain their elastic deformation, returning the crossing portion to its first state. When food refluxes to the blocking structure 2, the reflux generates an upward force, causing the first ratchet 212 to press more firmly against the second main body 221 and the second ratchet 222 to press more firmly against the first main body 211, resulting in a tighter cross-connection between the first valve 21 and the second valve 22, thereby sealing the channel within the stent body 1 and preventing food reflux.

[0042] Both the first valve 21 and the second valve 22 have a downwardly curved arc structure. The first valve 21 has a first sidewall 214 connected to the inner wall of the stent body 1, located at the other end of the first body portion 211, and above the first ratchet 212. The second valve 22 has a second sidewall 224 connected to the inner wall of the stent body 1, located at the other end of the second body portion 221, and above the second ratchet 222. This makes it easier for both the first ratchet 212 and the second ratchet 222 to move downwards when food flows from top to bottom, thus making it easier for the crossing portion to transition from the first state to the second state, and reducing the impact of the blocking structure 2 on food flow during normal eating.

[0043] The first valve 21 and the second valve 22 can be symmetrically arranged, which simplifies the manufacturing process of the esophageal stent.

[0044] Both the first valve 21 and the second valve 22 can be connected to the stent body 1 by adhesive bonding.

[0045] like Figure 4As shown, the esophageal stent also includes an anchoring part 3 fixedly disposed on the stent body 1. The anchoring part 3 is used to position the esophageal stent in the patient's body to prevent the esophageal stent from shifting.

[0046] Anchoring part 3 is provided at the upper end of the support body 1. Multiple anchoring parts 3 are provided at intervals along the circumferential direction of the support body 1, and each anchoring part 3 protrudes outward from the outer circumferential surface of the support body 1.

[0047] Each anchoring part 3 is inclined in the opposite direction to the spiral direction E of the stent body 1 from its outer circumference. Thus, when the esophageal stent is inserted into the patient's body, the stent body 1 expands along the spiral direction E, and the direction in which the anchoring part 3 moves with the stent body 1 is precisely the direction in which it penetrates the patient's body. This makes it easier for the anchoring part 3 to penetrate the patient's body, thereby positioning the esophageal stent. Conversely, when the esophageal stent is removed, the stent body 1 contracts along the spiral direction E, and the direction in which the anchoring part 3 moves with the stent body 1 is precisely the direction in which it withdraws from the patient's body. This avoids injury to the patient's body from the anchoring part 3 during the contraction of the stent body 1.

[0048] In this embodiment, the anchoring part 3 is a conical structure with the small end facing outward, and its small end is formed into the form of a needle, making it easier for the anchoring part 3 to penetrate the patient's body.

[0049] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An esophageal stent, comprising a stent body having a channel for food passage, characterized in that: The esophageal stent also includes a blocking structure disposed within the channel to prevent food reflux. The blocking structure includes a first valve and a second valve fixedly disposed on opposite sides within the channel. There is a cross portion between adjacent ends of the first valve and the second valve. The cross portion has a first state and a second state. When food refluxes to the blocking structure, the cross portion is in the first state. The cross portion is in the cross-position state so that the blocking structure blocks the channel. When food flows normally into the blocking structure, the cross portion is in the second state, and the cross arrangement of the cross portion is disengaged to allow the channel to be unobstructed; Both the first valve and the second valve are made of elastic material, such that the intersection of the first valve and the second valve is in a first state in their natural state. Both the first valve and the second valve have a downward-curving arc-shaped structure.

2. The esophageal stent according to claim 1, characterized in that: The first valve includes a first main body portion, the second valve includes a second main body portion, and the cross portion includes a first ratchet tooth disposed at one end of the first main body portion and a second ratchet tooth disposed at one end of the second main body portion; The first ratchet is provided with a plurality of teeth spaced apart along the end of the first main body, and the interval between two adjacent first ratchet teeth forms a first tooth groove; the second ratchet is provided with a plurality of teeth spaced apart along the end of the second main body, and the interval between two adjacent second ratchet teeth forms a second tooth groove. When the cross portion is in the first state, the first ratchet is inserted into the second tooth groove, and the first ratchet extends to the lower part of the second main body portion; the second ratchet is inserted into the first tooth groove, and the second ratchet extends to the lower part of the first main body portion. When the cross portion is in the second state, the first ratchet tooth disengages from the second tooth groove, and the second ratchet tooth disengages from the first tooth groove.

3. The esophageal stent according to claim 2, characterized in that: The first valve has a first sidewall connected to the inner sidewall of the stent body, the first sidewall being located at the other end of the first body portion and above the first ratchet. The second valve has a second sidewall connected to the inner sidewall of the stent body, the second sidewall being located at the other end of the second body portion and above the second ratchet.

4. The esophageal stent according to claim 1, characterized in that: The main body of the support is a spiral tubular structure.

5. The esophageal stent according to claim 4, characterized in that: The esophageal stent also includes an anchoring portion fixedly disposed on the stent body. Multiple anchoring portions are spaced apart along the circumferential direction of the stent body, and each anchoring portion protrudes outward from the outer circumferential surface of the stent body.

6. The esophageal stent according to claim 5, characterized in that: Each of the anchoring portions is inclined in the opposite direction of the spiral direction of the support body from the outer circumference of the support body.

7. The esophageal stent according to claim 5 or 6, characterized in that: The anchoring part is located at the upper end of the support body, and the anchoring part is a tapered structure with the small end facing outward.

8. The esophageal stent according to claim 4, characterized in that: The support body is made of an elastic material, allowing it to contract and expand in a spiral direction; or, the support body is made of a shape memory alloy material.

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