Pressure-adjustable gastrointestinal tract stent and implantation method thereof

Abstract

The invention relates to the technical field of medical treatment, in particular to a pressure-adjustable gastrointestinal tract stent and an implantation method thereof.The pressure-adjustable gastrointestinal tract stent comprises a supporting structure used for adjusting internal supporting force of the intestines and the stomach, an attaching structure used for being degraded internally and a backflow preventing structure used for avoiding peristalsis backflow of the intestines and the stomach; and an anti-backflow structure is movably connected to the interior of the attaching structure. Fan blades can naturally rotate along with gastrointestinal peristalsis, a rotating ring is driven to preliminarily adjust the opening and closing state of an anti-backflow structure, gastrointestinal contents can be allowed to flow in the forward direction through a screening groove and a through-flow ring, fluid pushes a conical block to compress a spring and a clamping block ring to lock a flow stopping groove in the reverse flow process, and therefore the gastrointestinal contents are prevented from flowing back. The conical block and the sealing ring form a dual anti-reflux barrier to prevent reflux, so that the technical problem that a traditional gastrointestinal tract stent is difficult to effectively prevent reflux of gastrointestinal contents and possibly causes reflux to cause complications is solved, the reflux of the gastrointestinal contents can be effectively prevented, and the health of a patient is guaranteed.

Description

Technical Field

[0001] This application relates to the field of medical technology, and in particular, to an adjustable-pressure gastrointestinal stent and an implantation method thereof. Background Art

[0002] Gastrointestinal diseases, especially problems such as gastroesophageal reflux disease and gastrointestinal tumors, have become one of the common health problems worldwide. To relieve the pain caused by these diseases to patients, gastrointestinal stents, as an important treatment means, are widely used in clinical practice. Gastrointestinal stents are mainly used to support the gastrointestinal wall, prevent the reflux of gastrointestinal contents, and ensure the normal function of the gastrointestinal tract. However, existing gastrointestinal stents still face many technical problems in the actual application process. First of all, traditional stents are difficult to effectively adjust the supporting force and often cannot be adjusted individually according to the specific needs of patients, resulting in poor treatment effects. Secondly, existing stents are difficult to prevent the reflux of gastrointestinal contents. The reflux phenomenon not only causes discomfort but may also lead to complications. Moreover, many traditional gastrointestinal stent materials have a risk of easily causing damage when contacting the gastrointestinal mucosa, affecting the recovery process of patients. Therefore, how to design a gastrointestinal stent that can effectively prevent reflux and provide stable and adjustable supporting force has become a major challenge in the current gastrointestinal stent technology.

[0003] Gastrointestinal stents in the prior art mostly rely on simple mechanical structures or fixed-type supports to provide support, but such stents often cannot effectively solve the problem of gastrointestinal content backflow in actual applications. In addition, the supporting force of traditional stents is not adjustable, and it is easy to damage the gastrointestinal mucosa during the implantation process, affecting the comfort and treatment effect of patients. Although some stents are designed with anti-backflow structures, it is still difficult to achieve an ideal anti-backflow effect. Especially under the dynamic action of gastrointestinal peristalsis, many designs still fail to effectively prevent the backflow phenomenon. Summary of the Invention

[0004] To solve the problems mentioned in the above background art, this application provides an adjustable-pressure gastrointestinal stent and an implantation method thereof.

[0005] An adjustable-pressure gastrointestinal stent and its implantation method provided by the present application adopt the following technical solutions: including a support structure for adjusting the internal support force of the gastrointestinal tract, a conforming structure for internal degradation, and an anti-reflux structure for preventing the peristaltic reflux of the gastrointestinal tract. The anti-reflux structure is movably connected inside the conforming structure, and the support structure is fixedly connected to the outside of the conforming structure; the anti-reflux structure includes an annular tube, one side inside the annular tube is snap-connected with a sealing ring, one side of the sealing ring is fixedly provided with a sieve slot, one side of the sieve slot is fixedly installed with a flow-through ring, a stop-flow groove is opened inside the annular tube, one side of the stop-flow groove is snap-connected with a tapered block, one side of the tapered block is fixedly connected with a spring, the rear side of the spring is fixedly connected to the left side inside the annular tube, the right side of the spring is fixedly connected with a block ring, one side of the block ring is fixedly connected with a rotating ring, and a fan blade is fixedly connected to the outside of the rotating ring.

[0006] Optionally, the support structure includes a rotating rod two fixedly connected to the inner middle part of the attaching plate, a connecting rod fixedly connected to the middle part of the rotating rod two, the connecting rod is fixedly installed inside the attaching plate, one side of the connecting rod is fixedly connected with a rotating shaft two, one side of the rotating shaft two is rotatably connected with a fixing rod, one side of the fixing rod is rotatably connected with a rotating shaft one, and the outer end of the rotating shaft one is rotatably connected with a pushing rod. The other side of the rotating shaft two is provided with a rotating rod.

[0007] Through the above solution, the attaching plate in the support structure is used to attach to the gastrointestinal wall. The rotating rod two fixed to its inner middle part and the connecting rod connected in the middle can connect and support components. The rotating shaft two on one side of the connecting rod can drive the fixing rod to expand. The cooperation between the rotating shaft one rotatably connected to one side of the fixing rod and the pushing rod rotatably connected to the outer end can adjust the expansion strength of the support structure. The rotating rod on the other side of the rotating shaft two assists in realizing related actions, enabling the support structure to provide stable and adjustable support force for the diseased part.

[0008] Optionally, the conforming structure includes an anti-corrosion layer, a connecting column is fixedly connected to the outside of the anti-corrosion layer, a support column is fixedly connected to the outside of the connecting column, and a buffer layer is fixedly connected to the outside of the support column.

[0009] Through the above solution, the anti-corrosion layer in the conforming structure can avoid damaging the gastrointestinal mucosa during stent implantation. The connecting column fixed to its outside can connect components. The support column fixed to the outside of the connecting column provides support for the stent. The buffer layer on the outside of the support column can be preferentially degraded, release drugs and reduce local pressure, ensuring the safety and effectiveness of the stent in the gastrointestinal tract.

[0010] Optionally, one end of the outside of the conforming structure is fixedly connected with a second ring, and a pipeline is installed on the outside of the second ring.

[0011] Through the above solution, the second ring fixed at one end of the outer side of the fitting structure connects and fixes the components. The pipe installed on the outer side of the second ring can be used to transport the stent and fix the transport path during the implantation process, ensuring that the stent can be smoothly and accurately transported to the target gastrointestinal site.

[0012] Optionally, a fitting structure is installed at the bottom of the pipe, and a square block is fixedly arranged on the outer side of the pipe.

[0013] Through the above solution, the fitting structure installed at the bottom of the pipe can wrap the whole stent to avoid mucosal damage during implantation, and at the same time the pipe is used to transport the stent; the square block fixedly arranged on the outer side of the pipe has a groove opened inside it, which can be used to install components such as the first rotating rod to assist the support structure in adjusting the expansion strength and ensure the realization of the stent transportation and subsequent support functions.

[0014] Optionally, a groove is opened inside the square block, a first rotating rod is installed inside the groove, a push rod is rotatably connected to the outer side of the first rotating rod, and a first ring is fixedly connected to one side of the square block.

[0015] Through the above solution, the groove opened inside the square block provides an installation position for the first rotating rod. The push rod rotatably connected to the outer side of the first rotating rod can adjust the expansion strength of the support structure. The first ring fixed to one side of the square block connects and fixes the components, ensuring that the support structure can stably and effectively apply a controllable pressure to the diseased site.

[0016] Optionally, one end of the outer side of the push rod is rotatably connected to one end of a connecting rod, and a first rotating rod is arranged on one side of the connecting rod.

[0017] Through the above solution, one end of the outer side of the push rod is rotatably connected to one end of the connecting rod, and the angle can be changed under the adjustment of an external controller, thereby adjusting the expansion strength of the support structure. The connecting rod connects and supports the components, and the first rotating rod arranged on one side of it assists the push rod in acting, enabling the support structure to provide a stable and adjustable support force for the diseased site.

[0018] Optionally, the anti-corrosion layer is polylactic acid, the support column is polycaprolactone, the buffer layer is poly(lactic-co-glycolic acid), and the connecting column is polyglycolic acid.

[0019] Through the above solution, using polylactic acid for the anti-corrosion layer can avoid damaging the gastrointestinal mucosa during stent implantation; selecting polycaprolactone for the support column can provide stable support for the stent; using poly(lactic-co-glycolic acid) for the buffer layer can preferentially degrade and release drugs and reduce local pressure; using polyglycolic acid for the connecting column can connect each component and enable the fitting structure to function well in the gastrointestinal tract.

[0020] Optionally, the support structure and the fitting structure are made of biodegradable materials, and the outer surface of the connecting rod is wrapped with polylactic acid.

[0021] Through the above solution, the support structure and the fitting structure are made of degradable materials, which can gradually degrade after completing the support and fitting functions, reducing the long-term impact on the patient's body. The polylactic acid wrapped on the outer surface of the connecting rod can further ensure its safety and compatibility in the gastrointestinal tract and reduce potential risks.

[0022] A method for using an adjustable-pressure gastrointestinal stent includes the following steps:

[0023] S1: Deliver the folded stent to the target gastrointestinal site through an endoscope or an interventional catheter. Use the pipeline and the square block to fix the delivery path. The first rotating rod and the push rod are in a contracted state. The anticorrosive layer of the fitting structure wraps the whole stent to avoid mucosal damage during implantation.

[0024] S2: Operation: After releasing the stent, the second rotating shaft of the support structure drives the fixing rod to unfold, the push rod extends outwards, drives the fitting plate to closely adhere to the gastrointestinal wall, and the fan blades rotate naturally with the peristalsis of the gastrointestinal tract, driving the rotating ring to initially adjust the opening and closing state of the anti-reflux structure.

[0025] S3: Adjust the angle between the push rod and the first rotating shaft through an external controller to change the expansion strength of the support structure. The push rod pushes the first rotating rod to slide in the groove of the square block, driving the fitting plate to apply a controllable pressure to the diseased part.

[0026] S4: When the gastrointestinal contents flow forward, the sieve slots and the flow-through rings allow passage; when flowing backwards, the fluid pushes the conical block to compress the spring, the block ring locks the flow-stop slot, and the conical block and the sealing ring form a double anti-reflux barrier to prevent reflux.

[0027] S5: The buffer layer degrades preferentially, releases drugs and reduces local pressure. Subsequently, the anticorrosive layer gradually decomposes, the support columns maintain mechanical support, and then until the connecting columns are completely degraded, the stent flexibly adapts to tissue healing.

[0028] S6: After the stent body degrades into small fragments, it is naturally discharged through the intestine; the incompletely degraded polycaprolactone support columns can be discharged with the peristalsis of the intestine due to their flexibility, and are removed non-invasively.

[0029] In summary, the present application includes the following beneficial technical effects:

[0030] 1. The present invention solves the technical problem that traditional gastrointestinal stents are difficult to effectively prevent the backflow of gastrointestinal contents, which may cause complications due to reflux, by setting up an anti-backflow structure including components such as an annular tube, a sealing ring, a screening groove, a flow-through ring, a stop-flow groove, a tapered block, a spring, a clamping block ring, a rotating ring, and fan blades. Through the mutual cooperation between the fan blades and the rotating ring, the fan blades can rotate naturally with gastrointestinal peristalsis, driving the rotating ring to initially adjust the opening and closing state of the anti-backflow structure. The gastrointestinal contents can flow forward through the screening groove and the flow-through ring. When there is backflow, the fluid pushes the tapered block to compress the spring, and the clamping block ring locks the stop-flow groove. The tapered block and the sealing ring form a double anti-backflow barrier to prevent backflow, effectively preventing the backflow of gastrointestinal contents and protecting the health of patients.

[0031] 2. The present invention solves the technical problems that the supporting force of traditional gastrointestinal stents is not adjustable, it is easy to damage the mucosa during implantation, and it is difficult to adapt to tissue healing by setting up a supporting structure including components such as a fitting plate, a second rotating rod, a connecting rod, a second rotating shaft, a fixing rod, a first rotating shaft, a pushing rod, and a rotating rod, and a fitting structure including components such as an anti-corrosion layer, a connecting column, a supporting column, and a buffer layer. Through the mutual cooperation between the supporting structure and the fitting structure, the second rotating shaft of the supporting structure can drive the fixing rod to unfold, the pushing rod to extend outwards, driving the fitting plate to closely adhere to the gastrointestinal wall. At the same time, an external controller can adjust the angle between the pushing rod and the first rotating shaft to change the expansion strength of the supporting structure. The pushing rod pushes the first rotating rod to slide in the groove of the square block, driving the fitting plate to apply a controllable pressure to the diseased part. Through the cooperation of the supporting structure and the fitting structure, a stable and adjustable supporting force can be provided to the diseased part. At the same time, the anti-corrosion layer and other degradable materials of the fitting structure can avoid mucosal damage during implantation, and the buffer layer and other components preferentially degrade and release drugs and reduce local pressure to adapt to the effect of tissue healing, providing a stable and adjustable supporting force, protecting the mucosa, adapting to tissue healing, improving the treatment effect and the quality of life of patients. Brief Description of the Drawings

[0032] Figure 1 is the schematic diagram of the overall structure in the embodiment of the present application;

[0033] Figure 2 is the schematic diagram of the structure of the square block in the embodiment of the present application;

[0034] Figure 3 is the schematic diagram of the side view structure of the supporting structure in the embodiment of the present application;

[0035] Figure 4 is the schematic diagram of the structure of the supporting structure in the embodiment of the present application;

[0036] Figure 5 is the schematic diagram of the side view structure of the anti-backflow structure in the embodiment of the present application;

[0037] Figure 6It is a schematic structural diagram of the anti-backflow structure in the embodiment of the present application;

[0038] Figure 7 It is a schematic side view structure diagram of the second ring in the embodiment of the present application;

[0039] Figure 8 It is a schematic structural diagram of the second ring in the embodiment of the present application;

[0040] Figure 9 It is a schematic structural diagram of the fitting structure in the embodiment of the present application.

[0041] Reference numerals: 1, fitting structure; 11, anti-corrosion layer; 12, support column; 13, buffer layer; 14, connecting column; 2, anti-backflow structure; 21, annular pipe; 22, fan blade; 23, rotating ring; 24, clamping block ring; 25, spring; 26, conical block; 27, flow-stop groove; 28, flow-through ring; 29, sieve slot; 210, sealing ring; 3, support structure; 31, fitting plate; 32, first rotating rod; 33, push rod; 34, first rotating shaft; 35, fixed rod; 36, second rotating shaft; 37, second rotating rod; 38, connecting rod; 4, pipeline; 5, first ring; 6, square block; 7, second ring. Detailed implementation manners

[0042] The following will Figures 1-9 further describe the present application in detail.

[0043] The embodiment of the present application discloses an adjustable-pressure gastrointestinal stent and its implantation method.

[0044] Please refer to Figures 1 to 9 , an adjustable-pressure gastrointestinal stent, including a support structure 3 for adjusting the internal support force of the gastrointestinal tract, a fitting structure 1 for internal degradation, an anti-backflow structure 2 for preventing the peristaltic backflow of the gastrointestinal tract, the anti-backflow structure 2 is movably connected inside the fitting structure 1, and the support structure 3 is fixedly connected to the outside of the fitting structure 1; the anti-backflow structure 2 includes an annular pipe 21, a sealing ring 210 is snap-connected to one side inside the annular pipe 21, a sieve slot 29 is fixedly arranged on one side of the sealing ring 210, a flow-through ring 28 is fixedly installed on one side of the sieve slot 29, a flow-stop groove 27 is opened inside the annular pipe 21, a conical block 26 is snap-connected to one side of the flow-stop groove 27, a spring 25 is fixedly connected to one side of the conical block 26, the rear side of the spring 25 is fixedly connected to the left side inside the annular pipe 21, a clamping block ring 24 is fixedly connected to the right side of the spring 25, a rotating ring 23 is fixedly connected to one side of the clamping block ring 24, and fan blades 22 are fixedly connected to the outside of the rotating ring 23.

[0045] It should be noted that the fitting structure 1 fits inside the gastrointestinal tract and is biodegradable. The anti-reflux structure 2 is movably connected inside it, and the support structure 3 is fixedly connected to the outside for adjusting the support force. In the anti-reflux structure 2, a sealing ring 210 is clamped on one side inside the annular tube 21. A sieve slot 29 is provided on one side of the sealing ring 210, and a flow-through ring 28 is installed on one side of the sieve slot 29. A stop flow groove 27 is formed inside the annular tube 21. A tapered block 26 is clamped on one side of the stop flow groove 27. A spring 25 is connected to one side of the tapered block 26. The rear side of the spring 25 is connected to the left side inside the annular tube 21, and the right side is connected to a catch ring 24. A rotating ring 23 is connected to one side of the catch ring 24, and fan blades 22 are connected to the outside of the rotating ring 23. The cooperation of each component prevents the reflux of gastrointestinal contents.

[0046] Please refer to Figures 1 to 9 , the support structure 3 includes a second rotating rod 37 fixedly connected to the inner middle part of the fitting plate 31. A connecting rod 38 is fixedly connected to the middle part of the second rotating rod 37. The connecting rod 38 is fixedly installed inside the fitting plate 31. A second rotating shaft 36 is fixedly connected to one side of the connecting rod 38. A fixing rod 35 is rotatably connected to one side of the second rotating shaft 36. A first rotating shaft 34 is rotatably connected to one side of the fixing rod 35. A pushing rod 33 is rotatably connected to the outer end of the first rotating shaft 34. A first rotating rod 32 is provided on the other side of the second rotating shaft 36.

[0047] It should be noted that in the support structure 3, a second rotating rod 37 is fixed to the inner middle part of the fitting plate 31. The middle part of the second rotating rod 37 is connected to the connecting rod 38. The connecting rod 38 is fixed inside the fitting plate 31. A second rotating shaft 36 is provided on one side of the connecting rod 38. A fixing rod 35 is rotatably connected to one side of the second rotating shaft 36. A first rotating shaft 34 is rotatably connected to one side of the fixing rod 35. A pushing rod 33 is rotatably connected to the outer end of the first rotating shaft 34. A first rotating rod 32 is also provided on the other side of the second rotating shaft 36. The components cooperate with each other to adjust and support the support structure 3.

[0048] Please refer to Figures 1 to 9 , the fitting structure 1 includes an anti-corrosion layer 11. A connecting column 14 is fixedly connected to the outside of the anti-corrosion layer 11. A support column 12 is fixedly connected to the outside of the connecting column 14. A buffer layer 13 is fixedly connected to the outside of the support column 12.

[0049] It should be noted that the fitting structure 1 is composed of multiple layers. The innermost layer is the anti-corrosion layer 11, which can avoid damaging the gastrointestinal mucosa during stent implantation. The connecting column 14 is fixedly connected to the outside of the anti-corrosion layer 11, and the connecting column 14 can connect various components. The support column 12 is fixed to the outside of the connecting column 14, and the support column 12 provides stable support for the stent. The buffer layer 13 is fixed to the outside of the support column 12. The buffer layer 13 can preferentially degrade and release drugs and reduce local pressure. Each layer ensures that the fitting structure 1 functions well in the gastrointestinal tract.

[0050] Please refer to Figures 1 to 9, at the outer end of the fitting structure 1, there is a fixed connection with a second ring 7, and a pipe 4 is installed on the outer side of the second ring 7.

[0051] It should be noted that at the outer end of the fitting structure 1, there is a fixed connection with a second ring 7. The second ring 7 is connected to and positions components, and a pipe 4 is installed on its outer side. The pipe 4 can be used to convey the stent and serve as a passage for other instruments in subsequent operations, enabling the fitting structure 1 to better cooperate with other components and ensuring the normal operation of the entire gastrointestinal stent device.

[0052] Please refer to Figures 1 to 9 , at the bottom of the pipe 4, there is a fitting structure 1 installed, and a square block 6 is fixedly arranged on the outer side of the pipe 4.

[0053] It should be noted that at the bottom of the pipe 4, there is a fitting structure 1 installed. The fitting structure 1 can fit the gastrointestinal inner wall and perform corresponding functions, ensuring stent stability and drug release, etc. A square block 6 is fixedly arranged on the outer side of the pipe 4, and the square block 6 can assist in fixing and connecting other components, enabling the pipe 4 to better play its role in the gastrointestinal stent device.

[0054] Please refer to Figures 1 to 9 , a groove is formed inside the square block 6, a first rotating rod 32 is installed inside the groove, a push rod 33 is rotatably connected to the outer side of the first rotating rod 32, and a first ring 5 is fixedly connected to one side of the square block 6.

[0055] It should be noted that a groove is formed inside the square block 6, and a first rotating rod 32 is installed in the groove. The first rotating rod 32 can rotate inside the groove, and a push rod 33 is rotatably connected to its outer side. The push rod 33 can move around the first rotating rod 32 to adjust the support structure 3. A first ring 5 is also fixedly connected to one side of the square block 6, and the first ring 5 can be used to connect other components or assist in positioning, enabling the square block 6 to play an important role in the gastrointestinal stent device.

[0056] Please refer to Figures 1 to 9 , one outer end of the push rod 33 is rotatably connected to one end of a connecting rod 38, and a first rotating rod 32 is arranged on one side of the connecting rod 38.

[0057] It should be noted that one outer end of the push rod 33 is rotatably connected to one end of the connecting rod 38. In this way, the push rod 33 can move around this end of the connecting rod 38, thereby adjusting the angle and position. And a first rotating rod 32 is arranged on one side of the connecting rod 38. The first rotating rod 32 can assist the connecting rod 38 in rotating and positioning, enabling the support structure 3 to be adjusted flexibly and better adapt to the complex environment inside the gastrointestinal tract.

[0058] Please refer to Figures 1 to 9 , the anti-corrosion layer 11 is polylactic acid, the support column 12 is polycaprolactone, the buffer layer 13 is poly (lactic - glycolic acid) copolymer, and the connecting column 14 is polyglycolic acid.

[0059] It should be noted that different biodegradable materials are used for each component of the fitting structure 1. The anti-corrosion layer 11 is made of polylactic acid, which can avoid damage to the gastrointestinal mucosa. The support column 12 is made of polycaprolactone to provide stable support for the stent. The buffer layer 13 is a copolymer of polylactic acid and glycolic acid, which can preferentially degrade and release drugs and buffer pressure. The connecting column 14 is made of polyglycolic acid, which can connect each component to ensure the safe and effective functioning of the fitting structure 1 in the gastrointestinal tract.

[0060] Please refer to Figures 1 to 9 , the support structure 3 and the fitting structure 1 are made of biodegradable materials, and the outer surface of the connecting rod 38 is wrapped with polylactic acid.

[0061] It should be noted that both the support structure 3 and the fitting structure 1 are made of biodegradable materials, so that the entire gastrointestinal stent can be gradually degraded and absorbed in the human body after completing its mission, avoiding the trouble of secondary surgery for removal. The outer surface of the connecting rod 38 is wrapped with polylactic acid, which can further reduce the stimulation of the stent to the gastrointestinal tissue and ensure the safety and effectiveness of the stent.

[0062] A method for using an adjustable-pressure gastrointestinal stent includes the following steps:

[0063] S1: Through an endoscope or an interventional catheter, the folded stent is transported to the target gastrointestinal site such as the stenosis segment. The pipeline 4 and the square block 6 are used to fix the transportation path. The first rotating rod 32 and the push rod 33 are in a contracted state. The anti-corrosion layer 11 of the fitting structure 1 wraps the whole stent to avoid mucosal damage during implantation.

[0064] S2: Operation: After the stent is released, the second rotating shaft 36 of the support structure 3 drives the fixing rod 35 to unfold, and the push rod 33 extends outward, driving the fitting plate 31 to closely adhere to the gastrointestinal wall. The fan blades 22 rotate naturally with the gastrointestinal peristalsis, driving the rotating ring 23 to initially adjust the opening and closing state of the anti-reflux structure 2.

[0065] S3: Adjust the angle between the push rod 33 and the first rotating shaft 34 through an external controller to change the expansion strength of the support structure 3. The push rod 33 pushes the first rotating rod 32 to slide in the groove of the square block 6, driving the fitting plate 31 to apply a controllable pressure to the diseased part.

[0066] S4: When the gastrointestinal contents flow forward, the screening groove 29 and the flow-through ring 28 allow passage; when flowing backward, the fluid pushes the conical block 26 to compress the spring 25, and the block ring 24 locks the stop-flow groove 27. The conical block 26 and the sealing ring 210 form a double anti-reflux barrier to prevent reflux.

[0067] S5: The buffer layer 13 degrades preferentially, releasing the drug and reducing the local pressure. Subsequently, the anti-corrosion layer 11 gradually decomposes, the support columns 12 maintain the mechanical support, and then until the connecting columns 14 are completely degraded, the stent flexibly adapts to tissue healing;

[0068] S6: After the stent body degrades into small fragments, it is naturally excreted through the intestine; the incompletely degraded polycaprolactone support columns 12 can be excreted with intestinal peristalsis due to their flexibility, achieving non-invasive removal.

[0069] The implementation principle of the adjustable-pressure gastrointestinal stent and its implantation method in the embodiments of this application is as follows:

[0070] First, when the adjustable-pressure gastrointestinal stent is implanted, it is in a folded state and is delivered to the target gastrointestinal site through an endoscope or an interventional catheter. At this time, the anti-corrosion layer 11 of the fitting structure 1 wraps the whole stent to avoid damaging the gastrointestinal mucosa during implantation. The pipeline 4 and the square block 6 are used to fix the delivery path, and the first rotating rod 32 and the push rod 33 are in a contracted state. After the stent is released, the second rotating shaft 36 of the support structure 3 drives the fixing rod 35 to unfold, the push rod 33 extends outwards, driving the fitting plate 31 to closely adhere to the gastrointestinal wall. At the same time, the fan blades 22 rotate naturally with gastrointestinal peristalsis, driving the rotating ring 23 to initially adjust the opening and closing state of the anti-reflux structure 2.

[0071] Secondly, during use, the angle between the push rod 33 and the first rotating shaft 34 can be adjusted through an external controller to change the expansion strength of the support structure 3. The push rod 33 pushes the first rotating rod 32 to slide in the groove of the square block 6, driving the fitting plate 31 to apply a controllable pressure to the diseased area to meet the requirements of different diseased areas. When the gastrointestinal contents flow forward, the sieve slots 29 and the flow-through rings 28 in the anti-reflux structure 2 allow them to pass through; if reverse flow occurs, the fluid pushes the conical block 26 to compress the spring 25, and the block ring 24 locks the flow-stop groove 27. The conical block 26 and the sealing ring 210 form a double anti-reflux barrier to prevent the reflux of gastrointestinal contents.

[0072] Finally, after the stent has played its role for a period of time, the buffer layer 13 degrades preferentially, releasing the drug and reducing the local pressure. Subsequently, the anti-corrosion layer 11 gradually decomposes, the support columns 12 maintain the mechanical support, until the connecting columns 14 are completely degraded, and the stent flexibly adapts to tissue healing. Eventually, the stent body degrades into small fragments and is naturally excreted through the intestine; the incompletely degraded polycaprolactone support columns 12 can be excreted with intestinal peristalsis due to their flexibility, achieving non-invasive removal and avoiding the trouble of secondary surgical removal.

[0073] The above are all the preferred embodiments of this application. The protection scope of this application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. An adjustable-pressure gastrointestinal stent, comprising a support structure (3) for adjusting the internal support force of the gastrointestinal tract, a conforming structure (1) that can be internally degraded, and an anti-reflux structure (2) for preventing the peristaltic reflux of the gastrointestinal tract, characterized in that: An anti-backflow structure (2) is movably connected inside the fitting structure (1), and a support structure (3) is fixedly connected to the outside of the fitting structure (1); The anti-backflow structure (2) includes an annular pipe (21). A sealing ring (210) is snap-fitted to one side inside the annular pipe (21). A sieve slot (29) is fixedly arranged on one side of the sealing ring (210). A flow-through ring (28) is fixedly installed on one side of the sieve slot (29). A stop-flow groove (27) is formed inside the annular pipe (21). A conical block (26) is snap-fitted to one side of the stop-flow groove (27). A spring (25) is fixedly connected to one side of the conical block (26). The rear side of the spring (25) is fixedly connected to the left inner side of the annular pipe (21). A clamping block ring (24) is fixedly connected to the right side of the spring (25). A rotating ring (23) is fixedly connected to one side of the clamping block ring (24). A fan blade (22) is fixedly connected to the outside of the rotating ring (23).

2. The adjustable-pressure gastrointestinal stent according to claim 1, characterized in that: The support structure (3) includes a second rotating rod (37) fixedly connected to the inner middle of a fitting plate (31). A connecting rod (38) is fixedly connected to the middle of the second rotating rod (37). The connecting rod (38) is fixedly installed inside the fitting plate (31). A second rotating shaft (36) is fixedly connected to one side of the connecting rod (38). A fixed rod (35) is rotatably connected to one side of the second rotating shaft (36). A first rotating shaft (34) is rotatably connected to one side of the fixed rod (35). A push rod (33) is rotatably connected to the outer end of the first rotating shaft (34). A first rotating rod (32) is arranged on the other side of the second rotating shaft (36).

3. The adjustable-pressure gastrointestinal stent according to claim 1, wherein: The fitting structure (1) includes an anti-corrosion layer (11). A connecting column (14) is fixedly connected to the outside of the anti-corrosion layer (11). A support column (12) is fixedly connected to the outside of the connecting column (14). A buffer layer (13) is fixedly connected to the outside of the support column (12).

4. The adjustable-pressure gastrointestinal stent according to claim 1, wherein: One outer end of the fitting structure (1) is fixedly connected to a second ring (7). A pipe (4) is installed on the outside of the second ring (7).

5. The adjustable-pressure gastrointestinal stent according to claim 4, wherein: The bottom of the pipe (4) is installed with the fitting structure (1). A square block (6) is fixedly arranged on the outside of the pipe (4).

6. The adjustable-pressure gastrointestinal stent according to claim 5, characterized in that: A groove is formed inside the square block (6). A first rotating rod (32) is installed inside the groove. A push rod (33) is rotatably connected to the outside of the first rotating rod (32). A first ring (5) is fixedly connected to one side of the square block (6).

7. The adjustable-pressure gastrointestinal stent according to claim 2, wherein: The outer end of the push rod (33) is rotatably connected to one end of the connecting rod (38). A first rotating rod (32) is arranged on one side of the connecting rod (38).

8. The adjustable-pressure gastrointestinal stent according to claim 3, wherein: The anti-corrosion layer (11) is polylactic acid, the support column (12) is polycaprolactone, the buffer layer (13) is poly(lactic-co-glycolic acid), and the connecting column (14) is polyglycolic acid.

9. The adjustable-pressure gastrointestinal stent according to claims 1 and 2, wherein: The support structure (3) and the fitting structure (1) are made of degradable materials. The outer surface of the connecting rod (38) is wrapped with polylactic acid.

10. A method for using an adjustable-pressure gastrointestinal stent, characterized in that: An adjustable-pressure gastrointestinal stent applicable to any one of the above-mentioned claims 1 to 9, comprising the following steps: S1: Deliver the folded stent to the target gastrointestinal site (such as the stenosis segment) through an endoscope or an interventional catheter. Use the pipeline (4) and the square block (6) to fix the delivery path. The first rotating rod (32) and the pushing rod (33) are in a contracted state. The anticorrosion layer (11) of the fitting structure (1) wraps the whole stent to avoid mucosal damage during implantation. S2: Operation: After releasing the stent, the second rotating shaft (36) of the support structure (3) drives the fixing rod (35) to unfold, and the pushing rod (33) extends outwards, driving the fitting plate (31) to closely adhere to the gastrointestinal wall. The fan blades (22) rotate naturally with gastrointestinal peristalsis, driving the rotating ring (23) to initially adjust the opening and closing state of the anti-reflux structure (2). S3: Adjust the angle between the pushing rod (33) and the first rotating shaft (34) through an external controller to change the expansion strength of the support structure (3). The pushing rod (33) pushes the first rotating rod (32) to slide in the groove of the square block (6), driving the fitting plate (31) to apply a controllable pressure to the diseased part. S4: When the gastrointestinal contents flow forward, the sieve slot (29) and the flow-through ring (28) allow passage; when flowing backward, the fluid pushes the conical block (26) to compress the spring (25), and the block ring (24) locks the stop-flow slot (27). The conical block (26) and the sealing ring (210) form a double anti-reflux barrier to prevent reflux. S5: The buffer layer (13) degrades preferentially, releases drugs and reduces local pressure. Subsequently, the anticorrosion layer (11) gradually decomposes, and the support columns (12) maintain mechanical support. Then until the connecting columns (14) are completely degraded, the stent flexibly adapts to tissue healing. S6: After the stent body degrades into small fragments, it is naturally excreted through the intestine; the incompletely degraded polycaprolactone support columns (12) can be excreted with intestinal peristalsis due to their flexibility, and are non-invasively removed.

Images