Drainage support
By introducing a limiting component into the drainage stent, the problem of easy displacement of plastic stents was solved, and the stability and safety of the drainage channel between the stomach and spleen were achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- MICRO-TECH (NANJING) CO LTD
- Filing Date
- 2025-01-10
- Publication Date
- 2026-04-21
AI Technical Summary
The plastic stents used in existing technologies are prone to displacement during drainage, resulting in poor stability.
A drainage stent comprising a tubular stent and a limiting component is designed. The limiting component consists of multiple limiting protrusions spaced apart circumferentially along the tubular stent. Each limiting protrusion is connected to the outer wall of the tubular stent at an angle and in the same direction of inclination to prevent the stent from shifting.
It effectively prevents the tubular stent from moving between organs, ensures the stability of the drainage channel, is suitable for drainage between the stomach and spleen, and reduces damage to the inner wall of the organs.
Smart Images
Figure CN224141001U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of medical devices, and more specifically, to a drainage stent. Background Technology
[0002] In existing technologies, plastic stents are used for drainage when dealing with solid tissues in the stomach or intestines.
[0003] Using plastic stents for drainage presents the problem of the stents easily shifting. Utility Model Content
[0004] The purpose of this application is to provide a drainage stent to alleviate the technical problem of easy displacement of plastic stents in the prior art.
[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:
[0006] The drainage support provided by this utility model includes a tubular support and a limiting component;
[0007] The limiting component includes at least two limiting protrusions, and a plurality of the limiting protrusions are spaced apart along the circumference of the tubular support; each limiting protrusion is connected to the outer wall of the tubular support and is set at an angle to the axis of the tubular support.
[0008] The multiple limiting protrusions are tilted in the same direction.
[0009] In one embodiment, at least one of the limiting protrusions is spaced apart from the other limiting protrusions along the axial direction of the tubular support.
[0010] In one embodiment, one end of the limiting protrusion is connected to the outer wall of the tubular support, and the other end is in an arc shape protruding away from the outer wall of the tubular support.
[0011] In one embodiment, the length of the limiting protrusion is b1, and the vertical distance between the end of the limiting protrusion and the outer peripheral wall of the tubular support is b2, where b1 > b2 ≥ 2 mm.
[0012] In one embodiment, the angle between the plane containing the limiting protrusion and the axis of the tubular support is set between 30° and 90°.
[0013] In one embodiment, the width of the end of the limiting protrusion connected to the tubular support is greater than the width of the end of the limiting protrusion.
[0014] In one embodiment, the width of the end of the limiting protrusion connected to the tubular support is smaller than the width of the end of the limiting protrusion.
[0015] In one embodiment, the limiting protrusion is covered with a film.
[0016] In one embodiment, the limiting protrusion is integrally formed with the tubular support.
[0017] In one embodiment, the tubular support is configured as a tubular structure formed by braided filaments extending spirally along the axial direction; the tubular support has a plurality of first braided filaments in a first spiral direction and a plurality of second braided filaments in a second spiral direction distributed circumferentially, the braided filaments in the first spiral direction and the braided filaments in the second spiral direction are alternately pressed together; the braided filaments in the first spiral direction are pulled out from below the braided filaments in the second spiral direction and twisted to form a limiting protrusion.
[0018] In one embodiment, the tubular support is configured as a tubular structure formed by braided filaments extending spirally along the axial direction; the tubular support has a plurality of first braided filaments in a first spiral direction and a plurality of second braided filaments in a second spiral direction distributed circumferentially, the braided filaments in the first spiral direction and the braided filaments in the second spiral direction being alternately pressed together; taking one of the braided filaments in the second spiral direction as a reference braided filament, the braided filament in the first spiral direction is drawn out from below the braided filament in the second spiral direction adjacent to the reference braided filament and extends to another braided filament in the second spiral direction adjacent to the reference braided filament.
[0019] In one embodiment, the limiting protrusion and the tubular support are separate structures, and the two are fixedly connected.
[0020] In one embodiment, the tubular support is divided into a connecting portion and two non-connecting portions, the two non-connecting portions being connected to both ends of the connecting portion respectively, and the limiting protrusion being located in the connecting portion; the length of the non-connecting portion is greater than or equal to 10 mm.
[0021] In one embodiment, the tubular support includes a compact segment and a sparse segment connected to the sparse segment, wherein the sparse segment has a greater degree of flexibility than the compact segment.
[0022] In one embodiment, the compact segment and the sparse segment are connected by a connecting segment.
[0023] Based on the above technical solutions, the technical effects achievable by this utility model can be analyzed as follows:
[0024] The drainage stent provided by this utility model includes a tubular stent and a limiting component. The limiting component includes at least two limiting protrusions, and multiple limiting protrusions are spaced apart circumferentially along the tubular stent. Each limiting protrusion is connected to the outer wall of the tubular stent and is angled to the axis of the tubular stent. The multiple limiting protrusions have the same inclination direction. Since the multiple limiting protrusions are angled to the outer wall of the tubular stent, the tubular stent overlaps between two organs, and the end of the limiting protrusion abuts against the inner wall of one of the organs, preventing the tubular stent from moving towards the other organ, thus solving the problem of easy displacement of plastic stents. This drainage stent is suitable for drainage of the stomach or intestine towards solid tissue. For example, when a stable and effective channel needs to be established between the stomach and spleen for drainage, both ends of the tubular stent extend into the stomach and spleen respectively, and the limiting component is located in the stomach. The limiting component can prevent the tubular stent from moving towards the spleen. Attached Figure Description
[0025] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 This is a schematic diagram of the drainage stent provided in the embodiments of this application from a first-view perspective;
[0027] Figure 2 A schematic diagram of the drainage stent provided in the embodiments of this application from a second perspective;
[0028] Figure 3 A front view of the drainage support provided in the embodiment of this application (multiple limiting protrusions are axially misaligned);
[0029] Figure 4 A side view of the drainage stent provided in an embodiment of this application;
[0030] Figure 5 A side view of another embodiment of the drainage stent provided in this application;
[0031] Figure 6 A perspective view of the first embodiment of the limiting protrusion in the drainage stent provided in this application;
[0032] Figure 7 A perspective view of a second embodiment of the limiting protrusion in the drainage stent provided in this application;
[0033] Figure 8 This is a schematic diagram of the drainage stent provided in an embodiment of this application.
[0034] icon:
[0035] 1 – Tubular support; 11 – Braided filaments in the first helical direction; 12 – Braided filaments in the second helical direction; 13 – Connecting part; 14 – Non-connecting part; 15 – Dense section; 16 – Sparse section; 17 – Connecting section; 18 – Reference braided filament;
[0036] 2 - Limiting protrusion. Detailed Implementation
[0037] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0038] In the description of this application, it should be noted that the terms "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 is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element 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 application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0039] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0040] See Figures 1 to 8The drainage stent provided in this embodiment includes a tubular stent 1 and a limiting component. The limiting component includes at least two limiting protrusions 2, which are spaced apart circumferentially along the tubular stent 1. Each limiting protrusion 2 is connected to the outer wall of the tubular stent 1 and is angled to the axis of the tubular stent 1. The multiple limiting protrusions 2 have the same inclination direction. Since the multiple limiting protrusions 2 are angled to the outer wall of the tubular stent 1, the tubular stent 1 overlaps between two organs, and the end of the limiting protrusion 2 abuts against the inner wall of one of the organs, preventing the tubular stent 1 from moving towards the other organ, thus solving the problem of easy displacement of plastic stents. This drainage stent is suitable for drainage of the stomach or intestine towards solid tissue. For example, when a stable and effective channel needs to be established between the stomach and spleen for drainage, both ends of the tubular stent 1 extend into the stomach and spleen respectively, and the limiting component is located in the stomach. The limiting component can prevent the tubular stent 1 from moving towards the spleen.
[0041] The structure and shape of the drainage stent are described in detail below:
[0042] As one implementation method, see Figure 3 At least one limiting protrusion 2 is provided at an axial distance from other limiting protrusions 2 along the tubular support 1.
[0043] Specifically, the axial spacing along the tubular support 1 means that the connection point between at least one limiting protrusion 2 and the tubular support 1 is not on the same annular line as the connection points between other limiting protrusions 2 and the tubular support 1. For example: see [link to example]. Figure 3 The limiting component contains four limiting protrusions 2; two of these protrusions form a first group, and their connection points with the tubular support 1 lie in the same vertical plane; the other two protrusions form a second group, also with their connection points in the same vertical plane. There is a distance 'a' between the vertical plane containing the connection points of the first and second groups of protrusions and the tubular support 1. The vertical planes are perpendicular to the axis of the tubular support 1. It is noteworthy that the distance 'a' between these two vertical planes is very small.
[0044] After interventional treatment with a drainage stent, the drainage stent experiences a certain amount of torsion. When the drainage stent torsions, if the connection points between the multiple limiting protrusions 2 within the limiting component and the tubular stent 1 are all in the same plane, then some of the limiting protrusions 2 will experience greater force, while others will experience less force or no force, resulting in uneven force distribution. The multiple limiting protrusions 2 are spaced apart along the axial direction of the tubular stent 1, ensuring that the ends of the multiple limiting protrusions 2 can all abut against the inside of the organ when the drainage stent torsions, thus enabling all the multiple limiting protrusions 2 to achieve the limiting effect.
[0045] As one implementation method, see Figure 4 and Figure 5 One end of the limiting protrusion 2 is connected to the outer wall of the tubular support 1, and the other end is an arc shape protruding away from the outer wall of the tubular support 1.
[0046] The end of the limiting protrusion 2 is arc-shaped, making the end of the limiting protrusion 2 smooth and preventing the limiting protrusion 2 from causing damage to the organ.
[0047] As one implementation method, see Figure 3 Let b1 be the length of the limiting protrusion 2 and b2 be the vertical distance between the end of the limiting protrusion 2 and the outer peripheral wall of the tubular support 1, where b1 > b2 ≥ 2 mm.
[0048] Specifically, the vertical distance refers to the distance b2 between the free end of the limiting protrusion 2 and the horizontal plane where the connection point of the tubular support 1 is located; in this embodiment, the vertical distance b2 between the end of the limiting protrusion 2 and the outer peripheral wall of the tubular support 1 is set to 2mm, 3mm, or 3.5mm, etc.
[0049] The vertical distance between the end of the limiting protrusion 2 and the outer peripheral wall of the tubular stent 1 is greater than or equal to 2 mm, so that the limiting protrusion 2 can abut against the inner wall of the organ.
[0050] In one embodiment, the angle between the plane where the limiting protrusion 2 is located and the axis of the tubular support 1 is set between 30° and 90°.
[0051] Specifically, the angle between the plane containing the limiting protrusion 2 and the axis of the tubular support 1 is set to 30°, 45°, or 60°, etc. Furthermore, the angle between the plane containing multiple limiting protrusions 2 and the axis of the tubular support 1 can be set to different angle values, but the tilting direction must be the same.
[0052] The angle between the plane containing the limiting protrusion 2 and the axis of the tubular stent 1 should be greater than or equal to 30°. This is to prevent the free end of the limiting protrusion 2 from failing to contact the inner wall of the organ if the angle is too small, thus failing to provide its limiting function. The angle between the plane containing the limiting protrusion 2 and the axis of the tubular stent 1 should be less than 90°. When the angle is greater than 90°, the tilt direction of the limiting protrusion 2 changes, requiring reverse application.
[0053] As one implementation method, see Figure 4 The width of the end of the limiting protrusion 2 that is connected to the tubular support 1 is greater than the width of the end of the limiting protrusion 2.
[0054] As another implementation method, see Figure 5The width of the end of the limiting protrusion 2 that is connected to the tubular support 1 is smaller than the width of the end of the limiting protrusion 2.
[0055] Specifically, in this embodiment, the width of the limiting protrusion 2 gradually increases. Of course, the limiting protrusion 2 can be triangular or trapezoidal, etc., all of which are within the protection scope of this utility model. The larger width at the end of the limiting protrusion 2 increases the contact area between the limiting protrusion 2 and the inner wall of the organ, thus enhancing the limiting effect.
[0056] As one implementation, the limiting protrusion 2 is covered with a film.
[0057] Specifically, the tubular support 1 is covered with a membrane, and the limiting protrusion 2 is also covered with a membrane. Of course, the limiting protrusion 2 not being covered with a membrane should also be within the scope of protection of this utility model. The tubular support 1 is made of metal or other elastic materials. Preferably, the membrane covering the tubular support 1 is a special membrane material, such as polytetrafluoroethylene, polyester, etc. The outer diameter of the tubular support 1 is set to 4-15 mm. It is worth noting that both the tubular support 1 and the limiting protrusion 2 can be compressed into the inserter, and the tubular support 1 can be easily released.
[0058] The tubular stent 1 is made of metal or other elastic materials, which improves its elasticity and allows for a tight fit between the stent 1 and the tissue in the cavity, preventing leakage. Simultaneously, the reduced stent wall thickness increases the inner diameter of the tubular stent 1, preventing blockage. Furthermore, the tubular stent 1 is covered with a membrane, enhancing its surface smoothness. The limiting protrusion 2 is also covered with a membrane, reducing adhesion between the limiting protrusion 2 and the tissue.
[0059] In one implementation, the limiting protrusion 2 is integrally formed with the tubular support 1.
[0060] As the first implementation method of one-piece molding, see Figure 6 The tubular support 1 is configured as a tubular structure formed by braided filaments extending spirally along the axial direction. The tubular support 1 has several first braided filaments in a first spiral direction and several second braided filaments in a second spiral direction distributed circumferentially. The first spiral braided filaments 11 and the second spiral braided filaments 12 are alternately pressed together. The first spiral braided filaments 11 are pulled out from below the second spiral braided filaments 12 and twisted to form a limiting protrusion 2. During weaving, the braided filaments used to form the limiting protrusion 2 are pulled out and twisted, supported by a support rod, and fixed by thermoforming.
[0061] As a second implementation method of one-piece molding, see Figure 7The tubular support 1 is configured as a tubular structure formed by braided filaments extending spirally along the axial direction. The tubular support 1 has several first braided filaments in a first spiral direction and several second braided filaments in a second spiral direction distributed circumferentially. The first spiral braided filaments 11 and the second spiral braided filaments 12 are alternately pressed together. Taking one of the second spiral braided filaments 12 as a reference braided filament 18, the first spiral braided filament 11 is drawn out from below the second spiral braided filament 12 adjacent to the reference braided filament 18 and extends to another second spiral braided filament 12 adjacent to the reference braided filament 18. During weaving, the braided filament used to form the limiting protrusion 2 is drawn out and supported by a support rod, and then fixed by thermoforming.
[0062] In another embodiment, the limiting protrusion 2 and the tubular support 1 are separate structures, and the two are fixedly connected.
[0063] Specifically, the limiting protrusion 2 and the tubular support 1 are separate structures, and the connecting end of the limiting protrusion 2 is bonded to the outer wall of the tubular support 1.
[0064] The limiting protrusion 2 and the tubular support 1 are separate structures. The tubular support 1 is manufactured first, and then the limiting protrusion 2 is installed on the tubular support 1 that needs to be installed, which facilitates the manufacturing process.
[0065] In the optional embodiments of this utility model, see Figure 2 The tubular support 1 includes a connecting part 13 and two non-connecting parts 14. The two non-connecting parts 14 are respectively connected to both ends of the connecting part 13, and the limiting protrusion 2 is located in the connecting part 13; the length of the non-connecting part 14 is greater than or equal to 10 mm.
[0066] Specifically, the length of the non-connecting portion 14 is less than the length of the connecting portion 13, and greater than or equal to 10 mm; the length of the non-connecting portion 14 is set to 10 mm, 11 mm, or 12.5 mm, etc. The connecting portion 13 and the two non-connecting portions 14 are integrally formed, and the connecting portion 13 and the two non-connecting portions 14 are three regions divided on the tubular support 1 according to the set length of the non-connecting portions 14. The limiting protrusion 2 can only be provided inside the connecting portion 13 to prevent the limiting protrusion 2 from being located at both ends of the tubular support 1.
[0067] The limiting protrusion 2 is located at the connecting part 13 to prevent the limiting protrusion 2 from being too close to the end face of the tubular support 1, which would cause the limiting protrusion 2 to flip inward when it flips, thus resulting in a weak limiting effect.
[0068] In the optional embodiments of this utility model, see Figure 8 The tubular stent 1 includes at least one compact segment 15 and at least one sparse segment 16, the compact segment 15 being connected to the sparse segment 16, and the sparse segment 16 having a greater degree of flexibility than the compact segment 15.
[0069] Specifically, during the weaving of the tubular stent 1, the weaving density of the tightly packed section 15 is greater than that of the sparsely packed section 16, making the sparsely packed section 16 more flexible than the tightly packed section 15. This allows the drainage stent to conform to different orientations of the human body structure, improving comfort. Furthermore, the wire diameters of the tightly packed section 15 and the sparsely packed section 16 may differ, or the materials used for the tightly packed section 15 and the sparsely packed section 16 may differ, to achieve different levels of flexibility between the tightly packed section 15 and the sparsely packed section 16. This should also be within the protection scope of this utility model embodiment. It is worth noting that the boundary line between the tightly packed section 15 and the sparsely packed section 16 is independent of the positions of the first limiting component and the second limiting component; the boundary line between the tightly packed section 15 and the sparsely packed section 16 can be located between the first limiting component and the second limiting component, or on the side of the first limiting component away from the second limiting component, or on the side of the second limiting component away from the first limiting component, etc.
[0070] In an optional embodiment of this utility model, the dense segment 15 and the sparse segment 16 are connected by a connecting segment 17.
[0071] Specifically, in this embodiment, see Figure 8 The braiding density of the connecting segment 17 is greater than that of the sparse segment 16, making the smoothness of the connecting segment 17 greater than that of the sparse segment 16. Of course, the scheme in which the braiding density of the connecting segment 17 is greater than that of the sparse segment 16 should also be within the protection scope of this utility model embodiment.
[0072] The tight segment 15 and the sparse segment 16 are connected by the connecting segment 17, which further enables the drainage stent to conform to different orientations of the human body structure and improve human comfort.
[0073] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0074] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A drainage stent, characterized in that, include: Tubular stent (1) and limiting assembly; The limiting component includes at least two limiting protrusions (2), and a plurality of the limiting protrusions (2) are spaced apart along the circumference of the tubular support (1); each of the limiting protrusions (2) is connected to the outer wall of the tubular support (1) and is set at an angle to the axis of the tubular support (1); The multiple limiting protrusions (2) have the same tilt direction.
2. The drainage stent of claim 1, wherein, At least one of the limiting protrusions (2) is spaced apart from the other limiting protrusions (2) along the axial direction of the tubular support (1).
3. The drainage stent of claim 1, wherein, One end of the limiting protrusion (2) is connected to the outer wall of the tubular support (1), and the other end is an arc shape protruding away from the outer wall of the tubular support (1).
4. The drainage stent of claim 3, wherein, Let b1 be the length of the limiting protrusion (2) and b2 be the vertical distance between the end of the limiting protrusion (2) and the outer peripheral wall of the tubular support (1), where b1 > b2 ≥ 2 mm.
5. The drainage stent of claim 4, wherein, The angle between the plane where the limiting protrusion (2) is located and the axis of the tubular support (1) is set between 30° and 90°.
6. The drainage stent of claim 3, wherein, The width of the end of the limiting protrusion (2) connected to the tubular support (1) is greater than the width of the end of the limiting protrusion (2).
7. The drainage stent of claim 3, wherein, The width of the end of the limiting protrusion (2) connected to the tubular support (1) is smaller than the width of the end of the limiting protrusion (2).
8. The drainage stent of claim 1, wherein, The limiting protrusion (2) is covered with a film.
9. The drainage stent of claim 1, wherein, The limiting protrusion (2) is integrally formed with the tubular support (1).
10. The drainage stent of claim 9, wherein, The tubular support (1) is configured as a tubular structure formed by braiding filaments extending spirally along the axial direction; The tubular support (1) has several first braided filaments in the first helical direction and several second braided filaments in the second helical direction distributed in the circumferential direction. The braided filaments (11) in the first helical direction and the braided filaments (12) in the second helical direction are alternately pressed together. The first helical braided yarn (11) is pulled out from below the second helical braided yarn (12) and twisted to form the limiting protrusion (2).
11. The drainage stent of claim 9, wherein, The tubular support (1) is configured as a tubular structure formed by braiding filaments extending spirally along the axial direction; The tubular support (1) has several first braided filaments in the first helical direction and several second braided filaments in the second helical direction distributed in the circumferential direction. The braided filaments (11) in the first helical direction and the braided filaments (12) in the second helical direction are alternately pressed together. Using one of the second helical direction braided yarns (12) as a reference braided yarn (18), the first helical direction braided yarn (11) is drawn out from below the second helical direction braided yarn (12) adjacent to the reference braided yarn (18) and extends to another second helical direction braided yarn (12) adjacent to the reference braided yarn (18).
12. The drainage stent of claim 1, wherein, The limiting protrusion (2) and the tubular support (1) are separate structures, and the two are fixedly connected.
13. The drainage stent of any of claims 1-12, wherein, The tubular support (1) is divided into a connecting part (13) and two non-connecting parts (14), the two non-connecting parts (14) are located at both ends of the connecting part (13), and the limiting protrusion (2) is located in the connecting part (13); the length of the non-connecting part (14) is greater than or equal to 10 mm.
14. The drainage stent of any of claims 1-12, wherein, The tubular stent (1) includes a compact segment (15) and a sparse segment (16), the compact segment (15) being connected to the sparse segment (16), and the sparse segment (16) having a greater degree of flexibility than the compact segment (15).
15. The drainage stent of claim 14, wherein, The dense segment (15) and the sparse segment (16) are connected by a connecting segment (17).