Esophageal stent
By using a titanium-nickel shape memory alloy material and a four-lumen catheter design for esophageal stents, and utilizing a drug delivery catheter and balloon fixation, the treatment challenge of esophageal injury without stenosis or obstruction has been solved. This achieves stable stent fixation and effective drug release, improving treatment outcomes and quality of life.
Patent Information
- Application Number
- CN202422589651.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-10-25
AI Technical Summary
Existing esophageal stents cannot effectively assist in the treatment of esophageal injuries without stenosis or obstruction, resulting in poor treatment outcomes and decreased quality of life.
An esophageal stent is designed using a titanium-nickel shape memory alloy material, which has shape memory properties and super elasticity. It is equipped with a four-lumen catheter and a drug delivery catheter. Drugs are injected through the drug delivery catheter and the stent is fixed with a balloon to form a false lumen to repair the damaged esophageal mucosa.
This approach achieves stable fixation of the esophageal stent and effective drug release, preventing displacement and dislodgement, reducing esophageal mucosal damage, and improving treatment outcomes and quality of life.
Smart Images
Figure CN223569465U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to medical instrument technical field, concretely relates to an esophageal stent. BACKGROUND
[0002] Esophageal stent is the most commonly used tool in the treatment of various benign and malignant esophageal diseases, which can effectively relieve esophageal obstruction and prevent the occurrence of esophageal stenosis. However, there are some patients who do not have obvious stenosis or obstruction, and their esophagus is normal in other parts, only the esophageal mucosa is interrupted and the esophageal damage caused by endoscopic surgery is not repaired, and there is a lack of effective esophageal stent in clinic to help the repair of esophageal mucosa.
[0003] In general, the esophageal stents commonly used in clinic at present are designed to relieve esophageal stenosis and obstruction, and are not suitable for the above-mentioned patients without esophageal stenosis or obstruction. For these patients, there is no similar stent that can be placed under the endoscope, and they often have to undergo surgery or conservative treatment, which greatly affects the treatment effect and quality of life of the patients. Therefore, there is an urgent need for an esophageal stent that can help the repair of esophageal mucosa. SUMMARY
[0004] In view of the above-mentioned defects, the utility model discloses an esophageal stent to solve the technical problem that there is a lack of auxiliary stent for the treatment of esophageal damage without stenosis or obstruction in the prior art.
[0005] To achieve the purpose, the utility model provides an esophageal stent, which comprises a stent body that can be placed in the esophagus of a human body and a four-lumen catheter arranged in the side wall of the stent body, an outlet is arranged on the outer side wall of the stent body, a drug delivery catheter is arranged in the four-lumen catheter, and the drug delivery catheter is connected with the outlet.
[0006] Compared with the prior art, the esophageal stent has the beneficial effects that the esophageal stent is provided with a four-lumen catheter, a drug delivery catheter is arranged in the four-lumen catheter, an outlet is arranged on the outer side wall of the stent body, the drug delivery catheter is in communication with the outlet, the esophageal stent is placed in the esophagus of a patient that needs to be repaired, then the drug delivery catheter is used to inject medicine, and the medicine will come out of the outlet to act on the damaged esophagus.
[0007] Preferably, the material of the stent body is titanium-nickel memory alloy, and the surface of the stent body is covered with a thin film of biocompatible silicone rubber.
[0008] Beneficial effects: The material of the stent body in the scheme is titanium nickel memory alloy. This metal has memory characteristics and super elasticity. In the environment of 0-10 DEG C, the stent is in a softened state, which can change the shape within a certain range and is easy to put into the inserter. When the stent is released from the inserter in the human body (environmental temperature is greater than 33 DEG C), the stent can gradually restore the original shape. The stent generates a continuous and soft radial expansion force, which acts on the inner wall of the esophagus, so that the narrow part gradually expands and restores the patency, and the silicon rubber film covering the surface of the esophageal stent has biocompatibility and does not stimulate the esophagus.
[0009] Preferably, the stent body is a double mushroom head stent, which comprises a mouth side mushroom head end, a stent body and an anal side mushroom head end.
[0010] Beneficial effects: The existing esophageal stent is prone to displacement or shedding due to physiological peristalsis of the esophagus. The stent body in the scheme adopts a double mushroom head stent, the mushroom head end has a larger contact area with the esophagus, and can be better fixed in the esophagus, so that the displacement or shedding problem caused by physiological peristalsis of the esophagus is avoided.
[0011] Preferably, a partition valve for preventing backflow of the drug is arranged on the administration catheter.
[0012] Beneficial effects: The partition valve in the scheme can prevent backflow of the drug, and can effectively protect the drug not entering the administration catheter from being contaminated due to backflow.
[0013] Preferably, a first inflation tube and a second inflation tube are further arranged in the four-lumen catheter, a first gas bag is arranged on the mouth side mushroom head end of the stent body, a second gas bag is arranged on the anal side mushroom head end, the first inflation tube is in communication with the first gas bag, and the second inflation tube is in communication with the second gas bag.
[0014] Beneficial effects: The mouth side mushroom head end in the scheme is provided with a first gas bag, the anal side mushroom head end is provided with a second gas bag, and the first inflation tube and the second inflation tube in communication with the first gas bag and the second gas bag are correspondingly arranged in the four-lumen catheter. After the gas bag is inflated, the upper and lower ends of the esophageal stent can be tightly attached to the esophagus, and the esophageal stent can be better fixed in the esophagus. At the same time, the existing esophageal stent will compress the esophagus after being placed in the esophagus, and the mucosa of the esophagus will be damaged after a long time. In the scheme, the first inflation tube controls the expansion of the first gas bag, the second inflation tube controls the expansion of the second gas bag, one gas bag is deflated through the inflation tube after a period of time, and the other remains unchanged, so as to prevent the esophagus from being crushed. The alternating exhaust design of the mushroom head can effectively prevent the esophageal mucosa from being damaged due to long-term compression of the esophagus.
[0015] Preferably, the medicine outlet is arranged on the stent body, a third inflation tube is further arranged in the four-cavity catheter, a third air bag is further arranged on the stent body, the third inflation tube is in communication with the third air bag, and the medicine outlet is not in contact with the third air bag.
[0016] Beneficial effects: the third air bag arranged on the stent body can be inflated or shrunk through the third inflation tube. The third air bag is located in the false cavity formed between the esophageal mucosa, the inflated air bag at the end of the mushroom head and the stent body. After the medicine is delivered through the delivery catheter, the medicine will be left in the false cavity to form a local hormone microenvironment to repair the damaged esophageal mucosa. The inflation or shrinkage of the third air bag can change the size of the false cavity, thereby indirectly controlling the amount of medicine released from the delivery catheter. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0018] Fig. 1 Fig. 1 is a structural schematic view of the esophageal stent of the present application;
[0019] Fig. 2 Fig. 2 is a state schematic view of the esophageal stent of the present application in the esophagus;
[0020] Fig. 3 Fig. 3 is a cross-sectional schematic view of the esophageal stent of the present application.
[0021] Main figure mark explanation: 1, stent body; 11, medicine outlet; 12, first air bag, 13, third air bag, 14, second air bag, 2, four-cavity catheter; 21, delivery catheter; 22, partition valve; 23, first inflation tube; 24, second inflation tube; 25, third inflation tube; 3, esophagus; 4, surgical wound; 5, false cavity. DETAILED DESCRIPTION
[0022] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the embodiments of the present application, and cannot be understood as a limitation of the present application.
[0023] In the description of the embodiments of the utility model, it is understood that the directions or position relations indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the directions or position relations shown in the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements indicated must have a specific direction, be constructed and operated in a specific direction, and thus cannot be understood as limiting the utility model.
[0024] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.
[0025] As an embodiment of the utility model:
[0026] Reference Figs. 1-3 The esophageal stent provided in the embodiment includes a stent body 1 and a four-lumen catheter 2.
[0027] The stent body 1 is a double mushroom head stent, including a mouth side mushroom head end, a stent body and an anus side mushroom head end. The existing esophageal stent is prone to displacement or falling due to physiological peristalsis of the esophagus 3, etc. The stent body 1 of the embodiment adopts a double mushroom head stent, the contact area of the mushroom head end with the esophagus 3 is larger, and it can be better fixed in the esophagus 3, and will not be displaced or fall due to physiological peristalsis of the esophagus 3, etc. The material of the esophageal stent in the embodiment is titanium nickel memory alloy, which has memory characteristics and super elasticity. In an environment of 0-10℃, the stent is in a softened state, which can change shape within a certain range, and is easy to put into a placement device (before the esophageal stent is placed in the esophagus of the human body, it needs to be put into the placement device first, so as to facilitate the placement of the stent in the esophagus); the stent is released from the placement device in the human body (the temperature is greater than 33℃), at this time the stent can gradually restore the original shape. The stent generates a continuous and gentle radial expansion force, which acts on the inner wall of the esophagus, so as to gradually expand and restore the stenosis; at the same time, the surface of the esophageal stent is covered with a layer of silicone rubber film (not shown in the figure), which has biocompatibility and will not stimulate the esophagus 3.
[0028] The four-cavity catheter 2 is arranged in the side wall of the stent body 1, and a first inflation tube 23, a second inflation tube 24, a third inflation tube 25 and a drug delivery catheter 21 are arranged in the four-cavity catheter 2, and a first air bag 12, a second air bag 14 and a third air bag 13 are arranged at the oral side mushroom head end, the anal side mushroom head end and the stent body 1 respectively, the first inflation tube 23, the second inflation tube 24 and the third inflation tube 25 are communicated with the first air bag 12, the second air bag 14 and the third air bag 13 respectively, and an air valve is arranged on each inflation tube, and a special air cylinder matched with the inflation tube in size can be used by medical staff to inflate the air bag, and the air valve is closed after inflation, so that the gas in the air bag will not leak, and the air bag can be deflated if the air valve is opened.
[0029] The existing esophageal stent will compress the esophagus 3 after being placed in the esophagus 3, and the mucosa of the esophagus 3 will be damaged after a long time, and in the embodiment, the upper and lower ends of the esophageal stent can be tightly attached to the esophagus after the first air bag 12 and the second air bag 14 are inflated, and the esophageal stent can be better fixed in the esophagus. Since the first air bag 12 and the second air bag 14 are not connected, one of the air bags can be deflated through the air valve after a period of time, and the other remains unchanged, so that the compression of the deflated esophageal stent on the esophagus 3 will be reduced. After a period of time, the deflated air bag is inflated, and the other is deflated, so that the two air bags can realize alternating exhaust, which can effectively prevent the esophageal stent from compressing the esophagus for a long time to cause damage to the esophageal mucosa.
[0030] The drug delivery catheter 21 arranged in the four-cavity catheter 2 is communicated with the drug outlet 11, the esophageal stent is placed in the esophagus 3 of the patient to be repaired, and then the drug is injected through the drug delivery catheter 21, the drug is delivered to the drug outlet 11 through the drug delivery catheter 21, and then acts on the damaged esophagus 3 from the drug outlet 11. In addition, a blocking valve 22 is arranged on the four-cavity catheter 2, the blocking valve 22 can prevent backflow of the drug, and can effectively protect the drug not entering the drug delivery catheter 21 from being contaminated due to backflow.
[0031] The principle of repairing the damaged esophagus 3 by the device is as follows: the stent body 1 is inserted into the damaged esophagus 3 through the nasal cavity of the patient, and the four-lumen catheter 2 is long enough to be partially left outside the patient's body. At this time, the first balloon 12 and the second balloon 14 of the mushroom head end at the oral side and the mushroom head end at the anal side are inflated, so that the stent body 1 can be fixed at the damaged esophagus 3. At this time, the esophageal mucosa, the inflated balloon at the mushroom head end and the stent body form a false cavity 5, and the drug outlet 11 is in the false cavity 5. The drug is delivered to the drug outlet 11 through the drug delivery catheter 21, and then released into the false cavity 5. The drug will remain in the false cavity 5 to form a local hormone microenvironment, which can slowly repair the surgical wound 4 and other esophageal damage problems caused by esophageal surgery. At the same time, the third balloon 13 is also in the false cavity 5. The size of the false cavity 5 can be changed by inflating or deflating the third balloon 13. When the third balloon 13 is inflated, the size of the false cavity 5 will be reduced, and the drug in the false cavity 5 will be temporarily "expelled" into the drug delivery catheter 21, which indirectly controls the amount of drug released from the drug delivery catheter 21.
[0032] In summary, the esophageal stent disclosed in the present application can be fixed at the damaged esophagus when placed in the esophagus. A four-lumen catheter is connected to one end of the stent body, a drug delivery catheter is arranged in the four-lumen catheter, and a drug outlet is arranged on the outer side wall of the stent body. The drug delivery catheter and the drug outlet are in communication. By injecting drugs through the drug delivery catheter, the drugs will be released from the drug outlet to act on the damaged esophagus to repair the damaged esophagus.
[0033] The above is only a preferred embodiment of the present application and is not used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. An esophageal stent, characterized by, The application relates to a stent body (1) and a four-cavity catheter (2) which can be inserted into a human esophagus (3), wherein the outer side wall of the stent body (1) is provided with a medicine outlet (11), the four-cavity catheter (2) is provided with a medicine delivery catheter (21), the medicine delivery catheter (21) is connected with the medicine outlet (11), the stent body (1) is a double-mushroom-head stent, comprising a mouth-side mushroom-head end, a stent body and an anus-side mushroom-head end, the medicine outlet (11) is arranged on the stent body, the four-cavity catheter (2) is further provided with a third inflation tube (25), the stent body is further provided with a third air bag (13), the third inflation tube (25) is in communication with the third air bag (13), and the medicine outlet (11) is not in contact with the third air bag (13).
2. The esophageal stent of claim 1, wherein, The material of the stent body (1) is titanium-nickel memory alloy, and the surface of the stent body (1) is covered with a biocompatible silicon rubber film.
3. The esophageal stent of claim 1, wherein, The medicine delivery catheter (21) is provided with a backflow-preventing partition valve (22).
4. The esophageal stent of claim 1, wherein, The four-cavity catheter (2) is further provided with a first inflation tube (23) and a second inflation tube (24), the mouth-side mushroom-head end of the stent body (1) is provided with a first air bag (12), the anus-side mushroom-head end is provided with a second air bag (14), the first inflation tube (23) is in communication with the first air bag (12), and the second inflation tube (24) is in communication with the second air bag (14).