A gastrointestinal stent

Abstract

The utility model relates to the technical field of medical support, more specifically, relate to a digestive tract support, including support main part, support head, support main part both ends with support head connection, support head diameter is greater than support main part, support main part includes multiple groups of deformable support unit, support unit interconnect. The utility model gives consideration to supporting strength and overall compliance, is fit to place in the intestine of greater bending degree, can more compliantly adhere twisted intestinal wall, improves treatment effect.

Description

Technical Field

[0001] This utility model relates to the technical field of medical stents, and more specifically, to a digestive tract stent. Background Technology

[0002] The digestive tract is a vital passageway for the human body to digest food, absorb nutrients, and excrete feces, and is closely related to human health. Stenosis of the digestive tract caused by various etiologies is medically termed gastrointestinal obstruction. Common causes include compression from digestive tract tumors, anastomotic stenosis after digestive tract surgery, and recurrent ulcers in the digestive tract. Once gastrointestinal obstruction occurs, patients are unable to eat or defecate normally, and may experience symptoms such as abdominal pain, bloating, nausea, and vomiting, affecting their quality of life and, in severe cases, even endangering their lives. Currently, the main treatment for gastrointestinal obstruction is enterostomy, which involves surgically creating an opening in the abdominal wall to allow the intestines to pass through and expel feces or intestinal contents. However, this treatment can cause malabsorption of nutrients, peristomal complications, and requires patients to wear an ostomy bag, leading to inconvenience in daily life. Therefore, gastrointestinal stent implantation, as a minimally invasive treatment method that can immediately relieve gastrointestinal obstruction, has gained increasing attention in recent years.

[0003] Gastrointestinal stents are typically housed within a stent catheter. Doctors insert the catheter into the obstructed section of the intestine using endoscopy or interventional procedures, placing the stent within the blocked intestinal lumen. The stent's own expansion force then widens the narrowed intestine, restoring patency and allowing the patient to resume eating and defecation. Gastrointestinal stent intervention surgery demands extremely precise positioning, covering the narrowed segment while avoiding compression of surrounding tissue. Furthermore, intestinal peristalsis can easily cause stent displacement, requiring sufficient support. Therefore, the overall procedure is complex and demands a high level of skill from the surgeon, limiting its widespread use. Figure 1 , Figure 2 As shown, the existing digestive tract stent uses an integral woven metal mesh structure, but this reduces the overall flexibility of the digestive tract stent, making it difficult to place in the intestine with a large degree of curvature. During use, it is easily compressed by diseased tissue, resulting in stenosis, which further increases the difficulty of surgery. Utility Model Content

[0004] The purpose of this invention is to overcome the problems of existing digestive tract stents, such as low flexibility, weak support, and unsuitability for intestines with large curvatures. It provides a digestive tract stent that balances support strength and overall flexibility, can more smoothly conform to the tortuous intestinal wall, improve treatment effectiveness, and reduce surgical difficulty.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A digestive tract stent is provided, comprising a stent body and a support head, wherein the two ends of the stent body are connected to the support head, the diameter of the support head is larger than that of the stent body, and the stent body comprises multiple sets of deformable stent units, which are interconnected.

[0006] After the digestive tract stent of this invention is inserted into the human body, the main body of the stent abuts against the inner wall of the digestive tract through the large-diameter support heads at both ends, thereby fixing the overall position of the digestive tract stent and preventing it from slipping during use, which would affect the treatment effect. In parts of the digestive tract, such as the intestines, the degree of curvature is significant. During placement, multiple stent units can deform to coordinate and adapt to the curved shape inside the digestive tract, balancing support strength and overall flexibility. This allows for a more compliant fit against the twisted intestinal wall, improving treatment effectiveness and making it easier for doctors to place the digestive tract stent at the site of intestinal obstruction, reducing the difficulty of the surgery.

[0007] Furthermore, the stent unit includes alternating flexible and rigid connecting units, with the connection between the stent unit and the support head being a rigid connecting unit. The flexible connecting units are capable of elastic deformation with a large degree of deformation, improving the overall flexibility of the stent. The rigid connecting units provide stable support, maintaining the overall shape of the stent and ensuring unobstructed internal channels. Simultaneously, the rigid connecting units prevent the stent body from detaching from the support head. The combination of flexible and rigid connecting units, while ensuring appropriate support strength, enhances the deformability of the digestive tract stent, making it more suitable for the digestive tract conditions of patients with intestinal obstruction.

[0008] Furthermore, the diameter of the rigid connecting unit is larger than the diameter of the flexible connecting unit. This larger diameter allows the stronger rigid connecting unit to abut against the intestinal wall, increasing the support between the digestive tract support and the intestinal wall, thus improving stability.

[0009] Furthermore, the flexible connecting unit is a polymer membrane, and the rigid connecting unit is a spiral metal braided filament. The flexible connecting unit and the rigid connecting unit are connected by sutures or by heat pressing. The polymer membrane has strong resilience and a high degree of deformability, while the spiral metal braided filament has high strength and is lightweight. Additionally, a biocompatible nickel-titanium alloy can be selected to reduce the degree of rejection and improve the treatment effect.

[0010] Furthermore, the stent unit includes an elastic stent and a covering attached to the elastic stent. When the digestive tract stent is bent, the elastic stent undergoes radial stretching or contraction. The covering can prevent tumor tissue from growing into the digestive tract stent, and its smooth surface makes it less prone to blockage. When the digestive tract stent passes through the narrow internal space of the digestive tract, the elastic stent contracts and undergoes radial deformation, reducing its radius for easier placement in relatively narrow digestive tracts. Through the radial stretching and contraction of the elastic stent, the inner diameter of the digestive tract stent is controlled to continuously adapt to the diameter of the digestive tract inner wall. Furthermore, the elastic stent has an annular corrugated structure, comprising multiple sequentially occurring peaks and troughs. During deformation, the annular corrugated structure of the elastic stent continuously adjusts the distance between the peaks and troughs, forming different stent radii. Simultaneously, it allows the elastic stents in different stent units to maintain different degrees of deformation, thereby adapting to the gradually changing internal diameter of the digestive tract.

[0011] Furthermore, the elastic stent has a helical structure, and the axis of the elastic stent coincides with the axis of the digestive tract stent. If the digestive tract is relatively narrow, the helical elastic stent will deform under pressure, reducing the inner diameter of the digestive tract stent and increasing its axial length. By adaptively adjusting the radius and axial length of the digestive tract stent, the helical elastic stent improves the deformability and flexibility of the digestive tract stent.

[0012] Furthermore, an elastic support ring is provided between adjacent stent units. The elastic support ring is located at the connection between adjacent stent units and can provide local radial support force to resist intestinal peristalsis pressure, prevent local deformation of the stent due to digestive tract compression, thereby preventing blockage and ensuring unobstructed digestive tract stent flow.

[0013] Furthermore, the support head has a cup-shaped, trumpet-shaped, or mushroom-shaped structure. A cup-shaped support head can increase the contact area between the digestive tract stent and the inner wall of the digestive tract, resulting in better support; a trumpet-shaped support head with an open structure can enhance the drainage effect of the digestive tract stent; a mushroom-shaped support head reduces the pressure of the digestive tract stent on the digestive tract, reducing discomfort.

[0014] Furthermore, the support head has a woven mesh structure. The flexible structure of the woven mesh allows the support head to conform to the natural curvature of the digestive tract, reducing mechanical damage to the tract wall. It also has a certain degree of dynamic adaptability, deforming with the peristalsis of the digestive tract to reduce the risk of displacement, making it particularly suitable for the frequently moving intestinal region.

[0015] Compared with the prior art, the beneficial effects of this utility model are: 1. Balancing support strength and overall flexibility, it is suitable for placement in intestines with a large degree of curvature, allowing it to more smoothly conform to the twisted intestinal wall and improve the treatment effect; 2. The inner diameter of the digestive tract stent is changed by the stretching and contraction of the elastic stent, thereby adapting to the digestive tract conditions of different patients; 3. The mushroom-shaped support head increases the overall fixation of the digestive tract stent, reducing displacement and discomfort. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a digestive tract stent structure in the prior art; Figure 2 This is a schematic diagram illustrating the effect of placing a digestive tract stent in the existing technology. Figure 3 This is a schematic diagram of the structure of a digestive tract stent; Figure 4 A schematic diagram showing the digestive tract stent after it has been placed in the digestive tract; Figure 5 This is a schematic diagram of the digestive tract stent in Example 2; Figure 6 This is a schematic diagram of the digestive tract stent in Example 3.

[0017] In the attached diagram: 100, main body of the support; 110, support unit; 111, flexible connection unit; 112, rigid connection unit; 113, elastic support; 114, membrane; 115, elastic support ring; 200, support head. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0019] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0020] Example 1 This embodiment is the first embodiment of a digestive tract stent, including a stent body 100 and a support head 200. The two ends of the stent body 100 are connected to the support head 200. The diameter of the support head 200 is larger than that of the stent body 100. The stent body 100 includes multiple sets of deformable stent units 110, which are interconnected.

[0021] like Figure 1 , Figure 2 As shown, after the digestive tract stent of this invention is inserted into the human body, the stent body 100 abuts against the inner wall of the digestive tract through the support heads 200 with larger diameters at both ends, thereby fixing the overall position of the digestive tract stent and preventing it from sliding during use, which would affect the treatment effect. In parts of the digestive tract, such as the intestines, which have a greater degree of curvature, multiple stent units 110 can deform during placement, thus coordinating and adapting to the curved shape inside the digestive tract, balancing support strength and overall flexibility, and more smoothly conforming to the twisted intestinal wall, improving the treatment effect.

[0022] In this embodiment, the support unit 110 includes alternately connected flexible connecting units 111 and rigid connecting units 112, with the connection between the support unit 110 and the support head 200 being a rigid connecting unit 112. Figure 1 As shown, the flexible connecting unit 111 can undergo elastic deformation to a large extent, improving the overall flexibility of the stent. The rigid connecting unit 112 provides stable support, keeping the overall shape of the stent stable and ensuring that the internal channels of the stent remain unobstructed. At the same time, the rigid connecting unit 112 connects to the support head 200, preventing the stent body 100 from becoming loose from the support head 200. The flexible connecting unit 111 and the rigid connecting unit 112 work together to improve the deformation capacity of the digestive tract stent while ensuring appropriate support strength, making it more suitable for the digestive tract conditions of patients with intestinal obstruction.

[0023] In this embodiment, the diameter of the rigid connecting unit 112 is larger than that of the flexible connecting unit 111. The larger diameter of the rigid connecting unit 112 allows the stronger rigid connecting unit 112 to abut against the intestinal wall, increasing the support force between the digestive tract support and the intestinal wall, and improving stability.

[0024] The flexible connecting unit 111 is a polymer membrane, and the rigid connecting unit 112 is a spiral metal braid. The flexible connecting unit 111 and the rigid connecting unit 112 are connected by sutures or thermoforming. The polymer membrane has strong resilience and a high degree of deformability, while the spiral metal braid is high-strength, lightweight, and can be made of biocompatible nickel-titanium alloy to reduce rejection and improve treatment efficacy. The rigid connecting unit 112 can also be made of a highly biocompatible rubber-based material to further increase the deformability of the digestive tract stent, facilitating its retraction into the catheter while ensuring stable support within the digestive tract and preventing stenosis due to compression from diseased tissue.

[0025] The support head 200 has a cup-shaped, trumpet-shaped, or mushroom-shaped structure. A cup-shaped support head 200 increases the contact area between the digestive tract stent and the inner wall of the digestive tract, providing good support; a trumpet-shaped support head 200's open structure enhances the drainage effect of the digestive tract stent. For example... Figure 2 As shown, the mushroom-shaped support head 200 enhances the fixation performance of the digestive tract stent, reducing displacement and discomfort.

[0026] The support head 200 has a woven mesh structure. For example... Figure 1 , Figure 2 As shown, the flexible structure of the woven mesh allows the support head 200 to conform to the natural curvature of the digestive tract, reducing mechanical damage to the duct wall. It also has a certain degree of dynamic adaptability, allowing it to deform with the peristalsis of the digestive tract, reducing the risk of displacement, and is especially suitable for the frequently active intestinal region.

[0027] The working principle of the digestive tract stent in this embodiment is as follows: The digestive tract stent in this embodiment adopts a multi-segment design that combines rigidity and flexibility. The braided mesh support heads 200 with large diameters at both ends fit against the inner wall of the digestive tract, effectively preventing displacement. The stent body 100 is composed of alternating rigid connecting units 112 and flexible connecting units 111. The rigid connecting units 112 directly contact the inner wall of the digestive tract to provide stable support, while the flexible connecting units 111 give the stent elastic deformation ability, so that it can conform to the curvature and peristalsis of the intestine.

[0028] Example 2 This embodiment is a second embodiment of a digestive tract stent. Similar to the first embodiment, the difference lies in that the stent unit 110 includes an elastic stent 113 and a covering 114 connected to the elastic stent 113. When the digestive tract stent is bent, the elastic stent 113 undergoes radial stretching or contraction. The covering 114 can prevent tumor tissue from growing into the digestive tract stent and has a smooth surface that is not easily blocked. When the digestive tract stent passes through the narrow internal space of the digestive tract, the elastic stent 113 contracts and undergoes radial deformation, reducing its radius to facilitate placement in a relatively narrow digestive tract. Through the radial stretching and contraction of the elastic stent 113, the inner diameter of the digestive tract stent is controlled to continuously adapt to the diameter of the digestive tract inner wall.

[0029] like Figure 3 As shown, the elastic stent 113 in this embodiment has an annular corrugated structure, including multiple sequentially occurring peaks and troughs. During deformation, the annular corrugated structure of the elastic stent 113 continuously adjusts the distance between the peaks and troughs, forming different stent radii. Simultaneously, it allows the elastic stents 113 in different stent units 110 to maintain different degrees of deformation, thereby adapting to the gradually changing internal diameter of the digestive tract. In this embodiment, the covering 114 is sewn onto the elastic stent 113. The sewn area of ​​the covering 114 increases the roughness of the digestive tract stent surface, increasing stability and preventing displacement.

[0030] In this embodiment, an elastic support ring 115 is provided between adjacent stent units 110. The elastic support ring 115 is located at the connection between adjacent stent units 110 and can provide local radial support force to resist intestinal peristalsis pressure, prevent local deformation of the stent due to digestive tract compression, thereby forming a blockage and ensuring unobstructed digestive tract stent.

[0031] The working principle of the digestive tract stent in this embodiment is as follows: The digestive tract stent in this embodiment adopts a membrane-covered elastic corrugated tube structure. Through the radial expansion and contraction deformation of the annular corrugated elastic stent 113, it adapts to changes in the inner diameter of the digestive tract. In the narrow section, the corrugation is compressed to reduce the stent diameter for easy implantation, and in the dilated section, the corrugation is stretched to restore support. The elastic support ring 115 added between adjacent stent units 110 dynamically offsets the intestinal peristaltic pressure, prevents local collapse and blockage, and achieves gradient support from the narrow section to the dilated section.

[0032] Example 3 This embodiment is the third embodiment of a digestive tract stent. Similar to Embodiment 1, the difference lies in that the stent unit 110 includes an elastic stent 113 and a covering 114 connected to the elastic stent 113. When the digestive tract stent is bent, the elastic stent 113 undergoes radial stretching or contraction. The covering 114 can prevent tumor tissue from growing into the digestive tract stent and has a smooth surface that is not easily blocked. When the digestive tract stent passes through the narrow internal space of the digestive tract, the elastic stent 113 contracts and undergoes radial deformation, reducing its radius to facilitate placement in a relatively narrow digestive tract. Through the radial stretching and contraction of the elastic stent 113, the inner diameter of the digestive tract stent is controlled to continuously adapt to the diameter of the digestive tract inner wall.

[0033] like Figure 4 As shown, the elastic stent 113 in this embodiment has a spiral structure, and the axis of the elastic stent 113 coincides with the axis of the digestive tract stent. If the inside of the digestive tract is relatively narrow, the spiral elastic stent 113 will be compressed and deformed, reducing the inner diameter of the digestive tract stent and increasing the axial length. The spiral elastic stent 113 improves the deformability and flexibility of the digestive tract stent by adaptively adjusting the radius and axial length of the digestive tract stent.

[0034] The working principle of the digestive tract stent in this embodiment is as follows: The digestive tract stent in this embodiment adopts a spiral elastic stent 113 covered with a membrane 114 structure, and achieves dynamic self-adaptation through the radial compression-axial extension characteristics of the spiral elastomer: When passing through a narrow digestive tract, the spiral stent is compressed and contracts radially, reducing its diameter while extending axially, which facilitates implantation and maintains structural integrity, while increasing flexibility while ensuring support stability.

[0035] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0036] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A digestive tract stent, characterized in that, It includes a support body (100) and a support head (200). The two ends of the support body (100) are connected to the support head (200). The diameter of the support head (200) is larger than that of the support body (100). The support body (100) includes multiple sets of deformable support units (110), and the support units (110) are interconnected.

2. The digestive tract stent according to claim 1, characterized in that, The support unit (110) includes alternating flexible connection units (111) and rigid connection units (112), and the connection between the support unit (110) and the support head (200) is a rigid connection unit (112).

3. The digestive tract stent according to claim 2, characterized in that, The diameter of the rigid connecting unit (112) is larger than the diameter of the flexible connecting unit (111).

4. The digestive tract stent according to claim 2, characterized in that, The flexible connecting unit (111) is a polymer membrane, and the rigid connecting unit (112) is a spiral metal braided wire. The flexible connecting unit (111) and the rigid connecting unit (112) are connected by stitching or heat pressing.

5. The digestive tract stent according to claim 1, characterized in that, The stent unit (110) includes an elastic stent (113) and a membrane (114) attached to the elastic stent (113). When the digestive tract stent is bent, the elastic stent (113) undergoes radial stretching or contraction.

6. The digestive tract stent according to claim 5, characterized in that, The elastic support (113) has a ring-shaped corrugated structure, including multiple sequentially occurring peaks and troughs.

7. The digestive tract stent according to claim 5, characterized in that, The elastic stent (113) has a spiral structure, and the axis of the elastic stent (113) coincides with the axis of the digestive tract stent.

8. The digestive tract stent according to claim 1, characterized in that, An elastic support ring (115) is provided between adjacent support units (110).

9. The digestive tract stent according to claim 1, characterized in that, The support head (200) has a cup-shaped, trumpet-shaped, or mushroom-shaped structure.

10. The digestive tract stent according to claim 1, characterized in that, The support head (200) has a woven mesh structure.

Images