Minimally invasive degradable digestive tract anastomosis stent through natural orifice

Abstract

The utility model discloses a minimally invasive degradable digestive tract anastomosis stent through a natural orifice, which comprises a stent main body, the stent main body has compressibility, is a balloon expansible or self-expandable stent, is made of degradable materials, and is small in the middle and relatively expanded at two ends. A plurality of barbs are arranged at the two ends of the stent main body, when the stent main body is compressed, the barbs can be attached to the outer wall of the stent main body, and when the stent main body is unfolded, the barbs can be unfolded towards the outer side. The barb structures are arranged at the two ends of the stent body, the stent body can be fixed more firmly after the balloon is expanded, it can be ensured that an anastomotic stoma can be kept stable after an operation, and the risk of fistula formation is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of medical devices, and in particular to a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities. Background Technology

[0002] Digestive tract reconstruction after surgical resection of the digestive tract is a key aspect of surgery. It is prone to complications such as complex anastomosis, large trauma, or post-anastomosis complications, such as anastomotic leakage or anastomotic stenosis. The following section uses the most common esophagogastric anastomosis as an example to introduce the background of this technique.

[0003] Esophageal cancer is one of the five leading malignant tumors in China in terms of incidence and mortality. Surgical resection is the preferred treatment and the only radical cure. Esophageal-gastric anastomosis after resection is crucial. In open-chest surgery, anastomosis techniques mainly include manual suture anastomosis and stapler anastomosis. Manual suture anastomosis is the traditional method, using silk or absorbable sutures. It is complex, time-consuming, and prone to complications such as anastomotic leakage and stenosis. However, it is less expensive and remains the primary method in some regions. Stapler anastomosis currently uses two main methods: circular staplers and linear staplers. Circular staplers are the most commonly used and mature method, but the operation is relatively complex, and about 3%-5% of patients experience complications such as anastomotic leakage or stenosis.

[0004] Chinese patent CN209863936U discloses an anti-reflux gastrointestinal anastomosis stent used under laparoscopy, but the stent is prone to slippage, posing a risk to the patient. Summary of the Invention

[0005] To address the aforementioned problems with existing stents, this paper aims to provide a minimally invasive biodegradable digestive tract anastomosis stent with high stability, high safety, and wide applicability via natural orifices, as well as its implantation method.

[0006] The specific technical solution is as follows:

[0007] A minimally invasive biodegradable digestive tract anastomosis stent via natural orifice includes a stent body. The stent body is compressible, is a balloon-expandable or self-expanding stent, and is made of a biodegradable material. The stent body is narrow in the middle and relatively enlarged at both ends. The stent body is characterized by having several barbs at both ends. When the stent body is compressed, the barbs can adhere to the outer wall of the stent body. When the stent body is expanded, the barbs can extend outward.

[0008] As a further improvement and optimization of this solution, the support body includes a first woven mesh and a second woven mesh, which are cross-woven and connected, and the first woven mesh extends at both ends of the support body to form the barbs.

[0009] As a further improvement and optimization of this solution, the first woven mesh is a single-layer woven mesh, and the second woven mesh is a double-layer woven mesh.

[0010] As a further improvement and optimization of this solution, the extended threads of the first woven mesh are rotated in a single direction to form the barb.

[0011] As a further improvement and optimization of this solution, the extended threads of the first woven mesh are folded back at the end to form the barb.

[0012] As a further improvement and optimization of this solution, the material of the main body of the support is a biodegradable zinc alloy, magnesium alloy, or polylactic acid, polyethylene, PGA, or PCL material.

[0013] As a further improvement and optimization of this solution, the surface of the scaffold body can be coated with a biomaterial membrane and can be coated with a sustained-release drug that stimulates tissue growth or fights infection.

[0014] As a further improvement and optimization of this solution, the stent also includes a delivery system and a guide wire. The delivery system includes an inflation port, three layers of tubing, and a first balloon. The innermost layer of the three layers of tubing is the inner core, the middle layer is the push tube, and the outermost layer is the outer sheath.

[0015] The inner core can be traversed by a guide wire, and the inflation port is located at the tail end of the inner core; the first balloon is located at the head end of the inner core, and the shape of the first balloon is set to correspond to the shape of the stent body; the stent body can be retracted and compressed to attach to the inner sheath and the outer side of the first balloon at the head end of the inner core; after the delivery system delivers the stent body into place, it gradually pushes out the stent body and gradually expands the first balloon so that the stent body can be gradually unfolded and fixed to fit the proximal and distal ends of the digestive tract, or air can be injected through the inflation port to inflate the first balloon and assist or promote the expansion and fixation of the stent body.

[0016] As a further improvement and optimization of this solution, a detection mechanism is provided on the push tube to detect the tightness of the anastomosis suture. The detection mechanism includes:

[0017] The second balloon and the third balloon are sleeved and connected to the head of the push tube and are spaced apart. The second balloon and the third balloon can be retracted and compressed and attached between the outer sheath and the push tube.

[0018] The outer wall of the tail end of the push tube has a first air inlet, a liquid inlet, and a second air inlet distributed circumferentially. The outer wall of the head end of the push tube has a first air outlet communicating with the second balloon, a second air outlet communicating with the third balloon, and a liquid outlet. The liquid outlet is located between the second balloon and the third balloon. The inner wall of the push tube also has a first gas channel communicating with the first air inlet and the first air outlet, a second gas channel communicating with the second air inlet and the second air outlet, and a liquid inlet communicating with the liquid inlet and the liquid outlet.

[0019] The positive effects of the above technical solution compared with the existing technology are:

[0020] (1) The present invention provides barbed structures at both ends of the stent body, which can make the stent body more firmly fixed after balloon dilation, ensuring that the anastomosis remains stable after surgery and reducing the risk of fistula formation.

[0021] (2) The design of the main body of the stent of this utility model includes the functions of expansion and support to prevent stenosis at the anastomosis site. The stent is also adjustable to adapt to the anatomical structure and needs of different patients.

[0022] (3) The design of the bracket in this utility model should facilitate doctors to install and fix it quickly and accurately during surgery.

[0023] (4) The present invention can reduce the time of anastomosis surgery through the improved stent design, thereby reducing the risks associated with anesthesia and surgery.

[0024] (5) The entire stent of this utility model is covered with a thin film of medical materials, which can be covered with drugs and biological factors, and can be slowly released, which is conducive to the healing of anastomosis, supports digestive function, and ensures the normal passage of food.

[0025] (6) In this embodiment, after the main body of the support is installed, the tightness of the anastomosis can be detected by the detection mechanism to further avoid the occurrence of anastomotic leakage. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the main body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to the present invention;

[0027] Figure 2 This is a schematic diagram of the main body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to the present invention;

[0028] Figure 3 This is a schematic diagram of the bag-shaped anti-reflux valve structure of the stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural cavity according to the present invention.

[0029] Figure 4 This is a schematic diagram of the structure of the stent body of the minimally invasive biodegradable digestive tract anastomosis stent via natural cavity in the digestive tract according to this utility model.

[0030] Figure 5 This is a schematic diagram of the delivery system for the stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model.

[0031] Figure 6 This is a schematic diagram of the structure of the balloon-inflated stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention.

[0032] Figure 7 This is a schematic diagram of the detection mechanism for a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention.

[0033] Figure 8 This is a schematic diagram of the detection mechanism for a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention.

[0034] Figure 9 This is a cross-sectional view of the delivery tube for a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model.

[0035] Figure 10 This is a cross-sectional view of the delivery tube for a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model.

[0036] Figure 11 This is a schematic diagram of the annular groove of a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention.

[0037] Figure 12 This is a cross-sectional view of the tail of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model.

[0038] Figure 13 This is a schematic diagram of the positioning mechanism of a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention.

[0039] In the attached diagram: 1. Support body; 2. Conveying system; 3. Guide wire; 11. Barb; 12. Bag-shaped anti-backflow valve; 21. Inflation port; 22. Inner core; 23. Push tube; 24. Outer sheath; 25. First balloon; 26. Detection mechanism; 230. Annular groove; 231. Liquid outlet; 232. Liquid injection port; 233. Liquid injection channel; 234. First air outlet; 235. First air injection port; 236. First gas channel; 237. Second air outlet; 238. Second air injection port; 239. Second gas channel; 261. Second balloon; 262. Third balloon; 263. Adjusting ring; 264. Connector; 265. Positioning mechanism; 2651. Positioning component; 2652. Spring. Detailed Implementation

[0040] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical 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 utility model based on the specific circumstances.

[0043] Figure 1 This is a schematic diagram of the main body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices, according to the present invention. Figure 2 This is a schematic diagram of the main body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices, according to the present invention. Figure 3This is a schematic diagram of the bag-shaped anti-reflux valve structure of the stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model. Figure 4 This is a schematic diagram of the structure of the stent body of the minimally invasive biodegradable digestive tract anastomosis stent via natural orifices in the digestive tract according to this utility model. Figure 5 This is a schematic diagram of the delivery system for the stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices, according to the present invention. Figure 6 This is a schematic diagram of the structure of the balloon-inflated stent body of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to the present invention. Figure 7 This is a schematic diagram of the detection mechanism for a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention. Figure 8 This is a schematic diagram of the detection mechanism for a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention. Figure 9 This is a cross-sectional view of the delivery tube for a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model. Figure 10 This is a cross-sectional view of the delivery tube for a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model. Figure 11 This is a schematic diagram of the annular groove of a minimally invasive biodegradable digestive tract anastomosis stent via natural cavities according to the present invention. Figure 12 This is a cross-sectional view of the tail section of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to this utility model; as shown. Figure 1-6 The illustration shows a preferred embodiment of a minimally invasive biodegradable digestive tract anastomosis stent via natural orifice, comprising a stent body 1. The stent body 1 is compressible, is a balloon-expandable or self-expanding stent, and is made of a biodegradable material. The stent body 1 is smaller in the middle and relatively larger at both ends. Both ends of the stent body 1 have several barbs 11. When the stent body 1 is compressed, the barbs 11 can adhere to the outer wall of the stent body 1. When the stent body 1 is unfolded, the barbs 11 can extend outward.

[0044] In this embodiment, barbed structures are provided at both ends of the stent body 1. After the first balloon 25 is expanded, the stent body 1 can be fixed more firmly, which can ensure that the anastomosis can remain stable after the operation and reduce the risk of fistula formation.

[0045] In this embodiment, the design of the stent body 1 includes expansion and support functions to prevent stenosis at the anastomosis site. The stent is also adjustable to adapt to the anatomical structure and needs of different patients.

[0046] Even better, several barbs 11 can be located on different planes of the support body 1.

[0047] Furthermore, as a preferred embodiment, the support body 1 includes a first woven mesh and a second woven mesh, which are cross-woven and connected, and the first woven mesh extends at both ends of the support body 1 to form barbs 11.

[0048] Furthermore, as a preferred embodiment, the first woven mesh is a single-layer woven mesh, and the second woven mesh is a double-layer woven mesh.

[0049] like Figure 1 As shown, the extended threads of the first woven mesh rotate in a single direction to form barbs 11.

[0050] like Figure 2 As shown, in another preferred embodiment, the extended threads of the first woven mesh are folded back at the ends to form barbs 11.

[0051] Furthermore, as a preferred embodiment, the material of the support body 1 is a biodegradable zinc alloy, magnesium alloy, or polylactic acid, polyethylene, PGA, or PCL material.

[0052] Furthermore, as a preferred embodiment, the surface of the stent body 1 may be coated with a biomaterial membrane and may be coated with a sustained-release drug that stimulates tissue growth or fights infection.

[0053] Furthermore, as a preferred embodiment, the middle part of the stent body 1 has a bag-shaped anti-reflux valve 12, which consists of 2-3 leaflets and is unidirectionally open.

[0054] Furthermore, in a preferred embodiment, the stent also includes a delivery system 2 and a guide wire 3. The delivery system 2 includes an inflation port 21, three layers of tubing, and a first balloon 25. The innermost layer of the three layers of tubing is an inner core 22, the middle layer is a push tube 23, and the outermost layer is an outer sheath 24.

[0055] The inner core 22 can be accessed through the guide wire 3, and the inflation port 21 is located at the tail end of the inner core 22; the first balloon 25 is located at the head end of the inner core 22, and the shape of the first balloon 25 corresponds to the shape of the stent body 1; the stent body 1 can be retracted and compressed to attach to the outer sheath 24 and the outside of the first balloon 25 at the head end of the inner core 22. After the delivery system 2 delivers the stent body 1 into place, it gradually pushes out the stent body 1 and gradually expands the first balloon 25 so that the stent body can be gradually unfolded and fixed to match the proximal and distal ends of the digestive tract, or air can be injected through the inflation port 21 to inflate the first balloon 25 and assist or promote the expansion and fixation of the stent body 1.

[0056] Furthermore, as a preferred embodiment, one end of the guidewire 3 is a rigid tip and the other end is a soft tip. When the delivery device enters through a natural cavity (such as the mouth, anus, etc.), the soft tip is first inserted for guidance. When the position is reached and puncture is required (such as the blind end of the esophagus, stomach, etc.), the rigid tip is inserted to puncture the digestive tract wall and guide the delivery device to be inserted.

[0057] In this embodiment, the stent is designed to facilitate quick and accurate installation and fixation by the surgeon during operation.

[0058] In this embodiment, the improved stent design can reduce the anastomosis time, thereby reducing anesthesia and surgery-related risks.

[0059] In this embodiment, the entire stent is covered with a thin film of medical material, which may contain drugs or biological factors that can be slowly released, promoting anastomotic healing, supporting digestive function, and ensuring the normal passage of food.

[0060] like Figure 7-13 As shown, a detection mechanism 26 is provided on the push tube 23 for detecting the tightness of the anastomosis suture. The detection mechanism 26 includes:

[0061] The second balloon 261 and the third balloon 262 are sleeved and connected to the head of the push tube 23 and are spaced apart. The second balloon 261 and the third balloon 262 can be retracted and compressed and attached between the outer sheath tube 24 and the push tube 23.

[0062] The outer wall of the tail end of the push tube 23 has a first air inlet 235, a liquid inlet 232, and a second air inlet 238 distributed circumferentially. The outer wall of the head end of the push tube 23 has a first air outlet 234 communicating with the second balloon 261, a second air outlet 237 communicating with the third balloon 262, and a liquid outlet 231. The liquid outlet 231 is located between the second balloon 261 and the third balloon 262. The inner wall of the push tube 23 also has a first gas channel 236 communicating with the first air inlet 235 and the first air outlet 234, a second gas channel 239 communicating with the second air inlet 238 and the second air outlet 237, and a liquid inlet channel 233 communicating with the liquid inlet 232 and the liquid outlet 231.

[0063] In this embodiment, before and after installing the main body of the support, the inner core and the push tube 23 can be pushed forward and pushed out by the outer sheath tube, so that the second balloon 261 and the third balloon 262 are respectively located on both sides of the anastomosis. Inflation is carried into the second balloon 261 and the third balloon 262 through the first inflation port 235 and the second inflation port 238, respectively, so that the second balloon 261 and the third balloon 262 expand outward until they seal and contact the inner wall of the digestive tract. Then, a harmless liquid (which may be a colored harmless liquid) is injected into the digestive tract between the second balloon 261 and the third balloon 262 through the liquid injection port 232. By judging whether there is leakage of liquid from the anastomosis to the outside of the digestive tract, the tightness of the anastomosis suture is detected, and the anastomosis leakage is further avoided.

[0064] Furthermore, an adjusting ring 263 is provided at the tail end of the push tube 23. The adjusting ring 263 is rotatably sleeved on the push tube 23, and the inner wall of the adjusting ring 263 is sealed to the outer wall of the push tube 23. The adjusting ring 263 has a connector 264 that communicates with the inner ring of the adjusting ring 263. By rotating the adjusting ring 263, the connector 264 can be connected to the first air injection port 235 / the second air injection port 238 / the liquid injection port 232. In actual operation, the adjusting ring 263 is rotated to communicate with the first air injection port 235, and the air pump is connected to the connector 264 to inject air into the first air injection port 235 to inflate the second balloon 261. Then, the adjusting ring 263 is rotated to connect the connector 264 to the second air injection port 235. The air inlet 238 is connected, and air is injected into the second air inlet 238 to inflate the third balloon 262. The adjusting ring 263 is rotated again to connect the nozzle 264 with the liquid injection port 232. A water pump is connected through the nozzle 264 to inject harmless liquid into the liquid injection port 232, thereby causing the liquid outlet 231 to discharge liquid. When the liquid injection reaches the predetermined amount, the adjusting ring 263 can be rotated again to make the nozzle 264 staggered from the first air inlet 235, the second air inlet 238, and the liquid injection port 232. This allows the inner wall of the adjusting ring 263 to seal the first air inlet 235, the second air inlet 238, and the liquid injection port 232. Then, the anastomosis is observed for leakage to determine the tightness of the anastomosis suture.

[0065] More preferably, the tail end of the push tube 23 has an annular groove 230, the first injection port 232, the second injection port 232 and the injection port 232 are all located at the bottom of the annular groove 230, and the adjusting ring 263 is coaxially rotatably disposed in the annular groove 230.

[0066] A positioning mechanism 265 is also provided between the adjusting ring 263 and the push tube 23. The positioning mechanism 265 includes: a positioning member 2651 elastically disposed on the side wall of the adjusting ring 263 and three hemispherical positioning grooves disposed on the side wall of the annular groove 230. The positions of the three positioning grooves correspond one-to-one with the first air inlet 235, the second air inlet 238, and the liquid inlet 232, respectively. The positioning member 2651 can be positioned and engaged with any one of the positioning grooves. By positioning and engaging the positioning member 2651 with a positioning groove, the nozzle 264 is stably connected with the first air inlet 235 / second air inlet 238 / liquid inlet 232. When the adjusting ring 263 is manually rotated, the positioning member 2651 can retract into the side wall of the adjusting ring 263 and slide out of the corresponding positioning groove.

[0067] More preferably, a shrinkage groove is provided on the side wall of the adjusting ring 263, one end of the positioning member 2651 is slidably disposed in the shrinkage groove, the other end of the positioning member 2651 is a hemispherical structure, and a spring 2652 is provided in the shrinkage groove, one end of the spring 2652 abuts against the bottom of the shrinkage groove, and the other end abuts against one end of the positioning member 2651.

[0068] In a more optimized manner, the outer wall of the tail of the push tube 23 is also provided with three marks, the positions of which correspond one-to-one with the first air injection port 235, the second air injection port 238, and the liquid injection port 232. When the nozzle 264 is rotated to one mark, the positioning member 2651 is positioned and engaged with the positioning groove at the corresponding position.

[0069] An implantation method, comprising the above-mentioned minimally invasive biodegradable digestive tract anastomosis stent via natural orifices, the implantation method comprising:

[0070] S1: The stent body 1 is delivered to the anterior side of the anastomosis site in the digestive tract via the delivery system 2;

[0071] S2: Push the inner core 22 forward step by step, and push the stent body 1 to the anastomosis site of the digestive tract;

[0072] S3: Inflate the inflation port 21 to gradually inflate the first balloon 25 and assist the stent body 1 to gradually unfold and fix, and anastomose the proximal and distal ends of the digestive tract;

[0073] S4: Depress the first balloon 25 through the inflation port 21 to cause the first balloon 25 to contract and pull back the inner core 22 until the first balloon 25 contracts into the push tube 23;

[0074] S5: Push the push tube 23 and inner core 22 forward in a step-by-step synchronous manner, and push the third balloon 262 and the second balloon 261 in the detection mechanism 26 out of the outer sheath tube 24 in sequence, until the third balloon 262 passes through the support body 1;

[0075] S6: Inflate the second balloon 261 and the third balloon 262 through the first inflation port 235 and the second inflation port 238 respectively, so that the second balloon 261 and the third balloon 262 gradually expand until they seal against the inner wall of the digestive tract.

[0076] S7: Inject a colored, harmless liquid into the digestive tract between the second balloon 261 and the third balloon 262 through the injection port 232. The tightness of the anastomosis suture is checked by determining whether there is leakage of liquid out of the digestive tract through the anastomosis.

[0077] S8: When no leakage is detected, the second balloon 261 and the third balloon 262 deflate and contract, and gradually pull back the push tube 23 and the inner core 22 until the second balloon 261 and the third balloon 262 contract sequentially into the outer sheath tube 24.

[0078] S9: Remove the entire delivery system 2 and complete the implantation of the stent body 1.

[0079] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A minimally invasive, biodegradable digestive tract anastomosis stent via natural orifices, comprising a stent body, wherein the stent body is compressible, is a balloon-expandable or self-expanding stent, and is made of a biodegradable material, and wherein the stent body is narrow in the middle and relatively enlarged at both ends, characterized in that, Both ends of the support body have several barbs. When the support body is compressed, the barbs can adhere to the outer wall of the support body. When the support body is unfolded, the barbs can extend outward.

2. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 1, characterized in that, The support body includes a first woven mesh and a second woven mesh, which are cross-woven and connected, and the first woven mesh extends at both ends of the support body to form the barbs.

3. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 2, characterized in that, The first woven mesh is a single-layer woven mesh, and the second woven mesh is a double-layer woven mesh.

4. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to any one of claims 2-3, characterized in that, The extended threads of the first woven mesh rotate in a single direction to form the barbs.

5. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifices according to any one of claims 2-3, characterized in that, The extended threads of the first woven mesh are folded back at the ends to form the barbs.

6. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 1, characterized in that, The main body of the support is made of biodegradable zinc alloy, magnesium alloy, or polylactic acid, polyethylene, PGA, or PCL.

7. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 1, characterized in that, The surface of the scaffold body can be coated with a biomaterial membrane and can be coated with a sustained-release drug that stimulates tissue growth or fights infection.

8. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 1, characterized in that, The stent also includes a delivery system and a guide wire. The delivery system includes an inflation port, three layers of tubing, and a first balloon. The innermost layer of the three layers of tubing is an inner core, the middle layer is a push tube, and the outermost layer is an outer sheath. The inner core can be traversed by a guide wire, and the inflation port is located at the tail end of the inner core; the first balloon is located at the head end of the inner core, and the shape of the first balloon is set to correspond to the shape of the stent body; the stent body can be retracted and compressed to attach to the inner sheath and the outer side of the first balloon at the head end of the inner core; after the delivery system delivers the stent body into place, it gradually pushes out the stent body and gradually expands the first balloon so that the stent body can be gradually unfolded and fixed to fit the proximal and distal ends of the digestive tract, or air can be injected through the inflation port to inflate the first balloon and assist or promote the expansion and fixation of the stent body.

9. The minimally invasive biodegradable digestive tract anastomosis stent via natural orifice as described in claim 8, characterized in that, The push tube is equipped with a detection mechanism for detecting the tightness of the anastomosis suture. The detection mechanism includes: The second balloon and the third balloon are sleeved and connected to the head of the push tube and are spaced apart. The second balloon and the third balloon can be retracted and compressed and attached between the outer sheath and the push tube. The outer wall of the tail end of the push tube has a first air inlet, a liquid inlet, and a second air inlet distributed circumferentially. The outer wall of the head end of the push tube has a first air outlet communicating with the second balloon, a second air outlet communicating with the third balloon, and a liquid outlet. The liquid outlet is located between the second balloon and the third balloon. The inner wall of the push tube also has a first gas channel communicating with the first air inlet and the first air outlet, a second gas channel communicating with the second air inlet and the second air outlet, and a liquid inlet communicating with the liquid inlet and the liquid outlet.

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