Displacement-preventing esophageal stent

Abstract

The utility model discloses an anti-displacement esophageal stent, belongs to the technical field of medical instruments, and solves the problem that the esophageal stent is easy to displace downwards under the influence of the structure of an esophagus when being deformed by matching with esophageal peristalsis and is still subjected to downward acting force. The problem is common in the conventional practical application process of the esophageal stent, and no good method can be used for improving the esophageal stent at present. Comprising a woven stent base body, and the pipe diameter of the stent base body is gradually increased from top to bottom. According to the esophageal stent, the shape of the esophageal stent adapts to the increasing change of the section of the esophagus from top to bottom, it is ensured that the esophageal stent is completely attached to the inner wall of the esophagus, the resistance to displacement caused by wriggling and form changes is improved, the anti-skid ring pieces drive the ring attaching pieces to move downwards during displacement, deformation of the ring warping pieces is caused, and contact between the anti-skid ring pieces and the inner wall of the esophagus serves as attachment points; elastic potential energy is released to apply upward force, so that the position of the bracket is maintained, and the condition of continuous downward displacement is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to an anti-displacement esophageal stent. Background Art

[0002] Esophageal stents are medical devices used to treat diseases such as esophageal stricture or esophageal cancer. As the main passage connecting the mouth and stomach, if the esophagus is narrowed due to various reasons, patients may face problems such as difficulty swallowing and food obstruction, which seriously affects the quality of life. For example, esophageal cancer treatment may also cause esophageal stricture. In these cases, esophageal stents become an effective treatment option.

[0003] Esophageal stents are usually made of metal or plastic materials and are in the form of a cylinder or mesh. Doctors insert the stent into the patient's esophagus through endoscopy or surgery to dilate narrowed areas or support damaged tissues, thereby restoring the normal function of the esophagus. Esophageal stents are sometimes removable, which means they can be easily removed when the condition improves or other treatments are needed. At the same time, the design of esophageal stents takes into account comfort and durability to ensure that patients receive long-term therapeutic effects.

[0004] Compared with traditional surgery, esophageal stent placement surgery usually has lower risks and shorter recovery time. Patients usually feel symptom relief and improved quality of life shortly after the operation. However, esophageal stents may also cause some complications, such as stent migration and ulcer formation. Therefore, when choosing to use esophageal stent treatment, the doctor will comprehensively consider the patient's condition, physical condition and possible risks, and fully communicate with the patient and make decisions together.

[0005] In general, esophageal stents, as interventional treatments, play an important role in the treatment of diseases such as esophageal stenosis and esophageal cancer, providing patients with a safe and effective option that helps improve their quality of life and long-term prognosis.

[0006] However, since the shape of the esophagus itself is small at the top and large at the bottom, its cross-sectional area will gradually increase downward, and once the food passes through the throat and enters the esophagus, at this stage, the muscles of the esophagus will push the food downward in a peristaltic manner, which is called the "propulsion wave" of the food. At the same time, the sphincter of the esophagus will gradually relax, allowing food to pass through, and then contract to prevent food from flowing back. It can be found from the above-mentioned human body structure that after the food enters the esophagus, the closer the lower end of the esophagus is to the stomach, the easier it is for the food to fall down, and the food will also be guided by the peristalsis of the esophagus. Similarly, when the esophageal stent is placed in the esophagus, it is a foreign body. Even if it can be deformed with the peristalsis of the esophagus, it will still be affected by the downward force, and under the influence of the structure of the esophagus, the esophageal stent is more likely to shift downward. This problem is quite common in the actual application of esophageal stents, and there is currently no better way to improve it.

[0007] Therefore, an anti-displacement esophageal stent is proposed to alleviate the above problems. Utility Model Content

[0008] The utility model aims to solve the shortcomings in the prior art and proposes an anti-displacement esophageal stent.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] An anti-displacement esophageal stent comprises a woven stent matrix, the diameter of which gradually increases from top to bottom, and there are a plurality of circles of woven mesopores on the stent matrix, the cross-section of the mesopores is rhombus-shaped, and the lateral opening spacing of each circle of the mesopores gradually increases from top to bottom.

[0011] Preferably, the upper and lower ends of the bracket base are respectively fixedly connected with an upper bowl portion and a lower bowl portion, and the opening cross-sectional areas of the upper bowl portion and the lower bowl portion are respectively larger than the upper end opening cross-sectional areas and the lower end opening cross-sectional areas of the bracket base.

[0012] Preferably, it also includes a coating, which is arranged on the inner and outer circles of the bracket base, the upper bowl part and the lower bowl part.

[0013] Preferably, it further comprises a plurality of anti-skid ring sheets, wherein the plurality of anti-skid ring sheets are arranged on the outer ring of the lower end of the bracket base, and the plurality of anti-skid ring sheets are evenly spaced in the length direction of the bracket base.

[0014] Preferably, the anti-slip ring piece includes a sticking ring piece that is fitted with the outer ring of the bracket base, and a warping ring piece that is integrally formed at the lower end of the sticking ring piece, and the inner ring of the warping ring piece forms a spacing groove.

[0015] Preferably, the maximum outer diameters of the plurality of lift ring pieces are gradually increased from top to bottom.

[0016] Preferably, the anti-slip ring sheet is made of silicone.

[0017] Preferably, a plurality of recovery wires are provided on the upper bowl portion, and both ends of the recovery wires are fixedly connected to the opening edge of the upper bowl portion to form a coil.

[0018] Preferably, the recovery line is made of nylon.

[0019] Preferably, the coating is a silicone rubber film.

[0020] The utility model has the following beneficial effects:

[0021] When the utility model is implanted in the human esophagus, the shape of the stent base adapts to the increase in the cross-section of the esophagus, ensuring that the stent is fully fitted with the inner wall of the esophagus and increasing the resistance to displacement caused by peristalsis and morphological changes. At the same time, an anti-slip ring is designed. When the esophageal stent attempts to shift downward, it will drive the sticking ring to shift downward, causing the warping ring to deform, and using its contact with the inner wall of the esophagus as an attachment point, the warping ring releases elastic potential energy, and after the peristalsis of the esophagus ends, an upward force is applied to the stent to maintain its position and avoid continued downward displacement. This design can improve the stability and safety of the esophageal stent and reduce the risk of displacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 It is a schematic diagram of the local structure of the support base in the utility model.

[0025] 1. Support matrix; 101. Mesopore; 2. Coating; 201. Upper bowl; 2011. Recovery line; 202. Lower bowl; 3. Anti-slip ring; 301. Adhesive ring; 302. Warping ring; 303. Spacer groove. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all of the embodiments.

[0027] An anti-displacement esophageal stent, such as Figure 3As shown, it includes a support matrix 1 woven by nickel-titanium memory alloy wire, the diameter of the support matrix 1 gradually increases from top to bottom, specifically in the shape of a truncated cone, and there are several circles of woven mesopores 101 on the support matrix 1, the cross-section of the mesopores 101 is diamond-shaped, and the lateral opening spacing of each circle of mesopores 101 is gradually increased from top to bottom.

[0028] like Figure 1 As shown, the upper and lower ends of the bracket base 1 are respectively fixedly connected with an upper bowl portion 201 and a lower bowl portion 202. Similarly, the upper bowl portion 201 and the lower bowl portion 202 are also woven by nickel-titanium memory alloy wire. The opening cross-sectional areas of the upper bowl portion 201 and the lower bowl portion 202 are respectively larger than the upper end opening cross-sectional areas and the lower end opening cross-sectional areas of the bracket base 1. A plurality of recovery lines 2011 made of nylon material are arranged on the upper bowl portion 201. Both ends of the recovery line 2011 are fixedly connected to the opening edge of the upper bowl portion 201 to form a coil.

[0029] It also includes a coating 2 which is a silicone rubber film. The coating 2 is bonded to the inner and outer circles of the bracket base 1, the upper bowl 201 and the lower bowl 202. The coating 2 fully wraps the inner and outer sides of the bracket base 1, the upper bowl 201 and the lower bowl 202.

[0030] like Figure 2 As shown, the outer ring of the coating 2 located at the lower end of the bracket base 1 is fixedly connected with a plurality of anti-skid ring pieces 3 made of silicone material, and the plurality of anti-skid ring pieces 3 are evenly spaced in the length direction of the bracket base 1. The anti-skid ring pieces 3 include a sticking ring piece 301 that is stuck to the outer ring of the bracket base 1, and a warping ring piece 302 that is integrally formed at the lower end of the sticking ring piece 301. The inner ring of the warping ring piece 302 forms a spacing groove 303, and the maximum outer diameters of the plurality of warping ring pieces 302 are gradually increased from top to bottom.

[0031] Before the utility model is inserted into the human esophagus through the launcher, the lower limit of the injured part in the esophagus is first found, and then the upper limit of the injured part in the esophagus is found, and an esophageal stent with a suitable length is selected for use.

[0032] After the relaxer is inserted into the esophagus, the shape of the stent base 1 can adapt to the increase in the cross-sectional area of ​​the esophagus from top to bottom, and if the esophageal occlusion is caused by esophageal tissue hyperplasia, the stent base 1 can expand the occluded part of the esophagus to ensure the smooth flow of the esophagus, and the upper bowl portion 201 can be placed on the inner wall of the esophagus and the esophageal tissue hyperplasia through the shape of its outer ring, thereby playing a limiting effect and preventing the entire esophageal stent from shifting downward. At the same time, when the stent base 1 is located in the esophagus, compared with the conventional cylindrical esophageal stent, it can fully fit with the inner wall of the esophagus from top to bottom, adapt to the gradual increase in the cross-sectional area of ​​the esophageal opening from top to bottom, thereby increasing the difficulty of the esophageal stent being displaced by peristalsis and the shape of the esophagus, and when swallowing occurs, the esophagus peristsalizes, and the local esophageal opening cross-sectional area increases accordingly. The shrinkage will also squeeze the stent matrix 1 at the same position. Since the stent matrix 1 is woven by nickel-titanium memory alloy wire, it can not only adapt to the changes in the shape of the esophagus, but also change its outer diameter through the deformation of the mesopore 101 when the stent matrix 1 is displaced. Specifically, when the stent matrix 1 is displaced, it is inevitable that the stent matrix 1 cannot maintain a consistent force state in its length direction. Once such a state can be achieved, the friction between the stent matrix 1 and the esophagus, and the thrust generated by the peristalsis of the esophagus will cause the stent matrix 1 to be compressed. After the stent matrix 1 is compressed, the distance between the vertical ends of the mesopore 101 opening is reduced, and the distance between the lateral ends of the mesopore 101 opening is increased, which makes the outer diameter of the stent matrix 1 at this location expand, so that it is stuck on the inner wall of the esophagus, further increasing the difficulty of its displacement.

[0033] The coating 2 is provided so as to wrap the stent matrix 1, the upper bowl portion 201 and the lower bowl portion 202, thereby effectively preventing the growth of granulation tissue on the esophageal wall and the reflux of gastric juice and food.

[0034] At the same time, the setting of the anti-slip ring piece 3 makes it possible for the esophageal stent to drive the sticking ring piece 301 to move downward when the esophageal stent attempts to move downward, causing the tilting ring piece 302 to deform, and the tilting ring piece 302 in the anti-slip ring piece 3 can contact the inner wall of the esophagus as an attachment point. The tilting ring piece 302 releases elastic potential energy to apply an upward force to the esophageal stent after the esophageal peristalsis ends, so that the esophageal stent can maintain its original position as much as possible, avoiding the situation where the esophageal stent continues to move downward.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An anti-displacement esophageal stent, characterized in that: The invention comprises a woven support matrix (1), wherein the diameter of the support matrix (1) gradually increases from top to bottom, and the support matrix (1) has a plurality of circles of woven mesopores (101), wherein the cross section of the mesopores (101) is rhombus-shaped, and the lateral opening spacing of each circle of the mesopores (101) gradually increases from top to bottom; The invention also comprises a plurality of anti-skid ring pieces (3), wherein the plurality of anti-skid ring pieces (3) are arranged on the outer ring of the lower end of the support base (1), and the plurality of anti-skid ring pieces (3) are evenly spaced in the length direction of the support base (1). The anti-skid ring pieces (3) comprise a bonding ring piece (301) bonded to the outer ring of the support base (1), and a warping ring piece (302) integrally formed at the lower end of the bonding ring piece (301), and the inner ring of the warping ring piece (302) forms a spacing groove (303).

2. The anti-displacement esophageal stent according to claim 1, characterized in that: The upper and lower ends of the support base (1) are respectively fixedly connected with an upper bowl portion (201) and a lower bowl portion (202), and the opening cross-sectional areas of the upper bowl portion (201) and the lower bowl portion (202) are respectively larger than the upper end opening cross-sectional areas and the lower end opening cross-sectional areas of the support base (1).

3. The anti-displacement esophageal stent according to claim 2, characterized in that: It also comprises a coating (2), wherein the coating (2) is arranged on the inner and outer circles of the support base (1), the upper bowl portion (201) and the lower bowl portion (202).

4. The anti-displacement esophageal stent according to claim 1, characterized in that: The maximum outer diameters of the plurality of warping ring pieces (302) are arranged to gradually increase from top to bottom.

5. The anti-displacement esophageal stent according to claim 1 or 4, characterized in that: The anti-slip ring piece (3) is made of silica gel.

6. The anti-displacement esophageal stent according to claim 2, characterized in that: A plurality of recovery lines (2011) are arranged on the upper bowl portion (201), and both ends of the recovery lines (2011) are fixedly connected to the opening edge of the upper bowl portion (201) to form a coil.

7. The anti-displacement esophageal stent according to claim 6, characterized in that: The recycling line (2011) is made of nylon.

8. The anti-displacement esophageal stent according to claim 3, characterized in that: The coating (2) is a silicone rubber film.

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