Inner-hooking TIPS stent withdrawal device, system and method

Abstract

Embodiments of the present invention provide an internal hook type TIPS stent withdrawal device, system and method, relating to the field of TIPS stents. The aim is to improve the problem that the stent cannot be withdrawn after release. The internal hook type TIPS stent withdrawal device includes a withdrawal delivery rod and a plurality of internal hooks; the withdrawal delivery rod is used to be delivered into the stent that expands in the body; the plurality of internal hooks are arranged on the withdrawal delivery rod at intervals along the length direction of the withdrawal delivery rod, and the plurality of internal hooks are all rotatably connected to the withdrawal delivery rod; the plurality of internal hooks are used to hook the stent so as to compress the stent onto the withdrawal delivery rod, so that the stent moves along with the withdrawal delivery rod. The internal hook type TIPS stent withdrawal system includes the above-mentioned device. The internal hook type TIPS stent withdrawal method is implemented by using the above-mentioned method. If the stent release position is incorrect or does not achieve the surgical expected effect, the already released stent can be quickly withdrawn through this device, which is convenient for continuing the next step of the operation.

Description

Technical Field

[0001] The present invention relates to the field of TIPS stents, and more particularly, to an inner-hooking type TIPS stent retraction device, system and method. Background Art

[0002] According to statistics, there are more than 20 million hepatitis B patients in China, and about 1 million cirrhotic patients are caused thereby. Portal hypertension (PHT) is the most important manifestation in the decompensated stage of liver cirrhosis. Among them, rupture and bleeding of esophageal and gastric varices is one of the most serious complications, with a high mortality rate, very difficult treatment, and intractable ascites also having a serious adverse impact on the patient's life. In recent years, transjugular intrahepatic portosystemic shunt (TIPS) has been widely used in the treatment of PHT, which has the advantages of minimally invasive, definite curative effect, and rapid postoperative recovery, and has become one of the main treatment methods for PHT.

[0003] Minimally invasive interventional treatment methods refer to implanting an inner stent in the vascular lesion segment. The implanted inner stent can support the stenotic and occluded segment of the blood vessel, reduce the elastic recoil and remodeling of the blood vessel, keep the lumen blood flow unobstructed, and also has the function of preventing restenosis. "TIPS surgery mainly refers to transjugular intrahepatic portosystemic stent shunt. Its principle is to use special interventional treatment instruments, under the guidance of X-ray fluoroscopy, through the jugular vein approach, establish an artificial shunt channel in the liver between the main branches of the hepatic vein and the portal vein, and maintain its permanent patency with a metal inner stent. After reducing the portal hypertension, it can control and prevent the rupture and bleeding of esophageal and gastric varices, and promote the absorption of ascites.

[0004] In current interventional surgeries, if the stent is released, due to the self-expansion property of the self-expanding stent itself, it is very difficult to remove or retract the stent again. If the stent release position is inaccurate during the surgery, the expected effect of reducing the portal vein pressure of the surgery is often not achieved, which will lead to the interruption or failure of the surgery. Once the surgery fails, it is very difficult to directly remove the stent during the surgery, and usually separate treatment with surgical surgery is still required, increasing the surgical difficulty for doctors and also bringing inconvenience to patients. Summary of the Invention

[0005] The object of the present invention includes, for example, providing an inner-hooking type TIPS stent retraction device, which can improve the problem that the stent cannot be retracted after release.

[0006] The object of the present invention also includes providing an inner-hooking type TIPS stent retraction system, which can improve the problem that the stent cannot be retracted after release.

[0007] Another object of the present invention is to provide a method for retracting an inner-hooking TIPS stent, which can improve the problem that the stent cannot be retracted after release.

[0008] The embodiments of the present invention can be implemented as follows:

[0009] The embodiments of the present invention provide an inner-hooking TIPS stent retraction device, including a retraction delivery rod and a plurality of inner hooks;

[0010] The retraction delivery rod is used to be inserted into the stent that expands in the body;

[0011] The plurality of inner hooks are arranged at intervals along the length direction of the retraction delivery rod, and the plurality of inner hooks are rotatably connected to the retraction delivery rod; the plurality of inner hooks are used to close to the retraction delivery rod during the process of the retraction delivery rod being inserted into the stent, or the plurality of inner hooks are used to expand when the retraction delivery rod is inserted to a preset position inside the stent, and hook the stent during the process of closing to the retraction delivery rod, so as to compress the stent onto the retraction delivery rod, so that the stent moves along with the retraction delivery rod.

[0012] In addition, the inner-hooking TIPS stent retraction device provided by the embodiments of the present invention may also have the following additional technical features:

[0013] Optionally, the plurality of inner hooks are arranged in an array along the length direction of the retraction delivery rod.

[0014] Optionally, each inner hook includes a first end and a second end that are opposite to each other; the first end of the inner hook is rotatably connected to the retraction delivery rod, and a traction groove is provided at the second end of the inner hook, and the traction groove is used to guide the stent to be caught in, and prevent the stent from exiting during the movement of the retraction delivery rod, so as to drive the stent to move synchronously.

[0015] Optionally, the traction groove includes a guiding inlet and a limiting opening that are communicated with each other; the guiding inlet is located at the opening of the limiting opening, and the guiding inlet is used to guide the braided wire of the stent to be caught in the limiting opening, and the limiting opening is used to prevent the braided wire of the stent from exiting.

[0016] Optionally, the guiding inlet is arranged along the thickness direction of the inner hook, and the limiting opening is arranged along the length direction of the inner hook; the limiting opening has a limiting notch that is offset along the length direction of the inner hook relative to the guiding inlet, and the limiting notch is used to prevent the braided wire of the stent from exiting.

[0017] Optionally, the inlet has an inlet surface, and the limit notch has a limit surface; the limit surface is arranged at an angle relative to the inlet surface to form the limit notch arranged in a dislocation along the length direction of the inner hook.

[0018] Optionally, the second end of the inner hook portion has a first portion and a second portion arranged at intervals along the length direction of the inner hook; the first portion and the second portion are respectively used for being clamped into the holes formed between the braided wires of the stent, and a traction groove is formed between the first portion and the second portion.

[0019] Optionally, a plurality of grooves are arranged on the retraction delivery rod; the plurality of grooves are respectively used for accommodating the plurality of inner hooks, so that when the plurality of inner hooks are closed to the retraction delivery rod, the surface of the inner hook is flush with the surface of the retraction delivery rod.

[0020] An embodiment of the present invention further provides an inner hook type TIPS stent retraction system, including a stent and an inner hook type TIPS stent retraction device, and the plurality of inner hooks are used for hooking the stent.

[0021] An embodiment of the present invention further provides an inner hook type TIPS stent retraction method, which is implemented by using an inner hook type TIPS stent retraction device, and includes the following steps:

[0022] The plurality of inner hooks are closed to the retraction delivery rod and are transported to the inside of the stent expanded in the body along with the retraction delivery rod;

[0023] The plurality of inner hooks are unfolded and hook the stent during the closing process to compress the stent onto the retraction delivery rod;

[0024] The retraction delivery rod drives the compressed stent to retract.

[0025] The beneficial effects of the inner hook type TIPS stent retraction device, system and method of the embodiments of the present invention include, for example:

[0026] The inner hook type TIPS stent retraction device includes a retraction delivery rod and a plurality of inner hooks; the retraction delivery rod is used for being transported to the inside of the stent expanded in the body; the plurality of inner hooks are arranged on the retraction delivery rod at intervals along the length direction of the retraction delivery rod, and the plurality of inner hooks are all rotatably connected to the retraction delivery rod; the plurality of inner hooks are used for closing to the retraction delivery rod during the process of the retraction delivery rod transporting to the inside of the stent, or the plurality of inner hooks are used for unfolding when the retraction delivery rod is transported to a preset position inside the stent, and hooking the stent during the closing process to compress the stent onto the retraction delivery rod, so that the stent moves along with the retraction delivery rod.

[0027] Multiple inner hooks are moved inside the expanded stent by retracting the delivery rod, and then the multiple inner hooks hook the stent and close onto the retracting delivery rod. As the retracting delivery rod moves, the stent is driven to be withdrawn, and the stent after accidental release is compressed and retracted, facilitating the continuation of the next surgical step. Moreover, the retracted stent does not need to be removed by other means, effectively improving the safety and success rate of the surgery.

[0028] The inner hook type TIPS stent retraction system includes a stent and the above-mentioned inner hook type TIPS stent retraction device, which can improve the problem that the stent cannot be retracted after release.

[0029] The inner hook type TIPS stent retraction method is implemented using the above-mentioned inner hook type TIPS stent retraction device, which can improve the problem that the stent cannot be retracted after release. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0031] Figure 1 Structural schematic diagram of the closed state of the inner hook type TIPS stent retraction device provided by the embodiment of the present invention;

[0032] Figure 2 Structural schematic diagram of the closed state of the inner hook type TIPS stent retraction device inside the stent provided by the embodiment of the present invention;

[0033] Figure 3 Structural schematic diagram of the deployed state of the inner hook type TIPS stent retraction device inside the stent provided by the embodiment of the present invention;

[0034] Figure 4 Structural schematic diagram of the inner hook in the inner hook type TIPS stent retraction device provided by the embodiment of the present invention;

[0035] Figure 5 Flow chart of the steps of the inner hook type TIPS stent retraction method provided by the embodiment of the present invention.

[0036] Icons: 10 - Inner hook type TIPS stent retraction device; 100 - Stent; 200 - Retracting delivery rod; 300 - Inner hook; 310 - First end; 320 - Second end; 321 - First part; 322 - Second part; 323 - Traction groove; 324 - Inlet; 325 - Inlet surface; 326 - Limit port; 327 - Limit notch; 328 - Limit surface; 400 - Marking ring. Detailed Description of the Embodiments

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. The components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0040] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships in which the inventive product is customarily placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0041] In addition, terms such as "first", "second", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0042] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0043] The following Figures 1 to 5 will be a detailed description of the internal hook type TIPS stent withdrawal device 10 provided in this embodiment.

[0044] Please refer to Figures 1 to 3, an embodiment of the present invention provides an in-hook type TIPS stent withdrawal device 10, including a withdrawal delivery rod 200 and a plurality of inner hooks 300; the withdrawal delivery rod 200 is used to be conveyed into the interior of the stent 100 that expands in the body; the plurality of inner hooks 300 are arranged at intervals along the length direction of the withdrawal delivery rod 200 on the withdrawal delivery rod 200, and the plurality of inner hooks 300 are all rotatably connected to the withdrawal delivery rod 200; the plurality of inner hooks 300 are used to close onto the withdrawal delivery rod 200 during the process of the withdrawal delivery rod 200 being conveyed into the interior of the stent 100, or the plurality of inner hooks 300 are used to expand when the withdrawal delivery rod 200 is conveyed to a preset position inside the stent 100, and hook the stent 100 during the process of closing onto the withdrawal delivery rod 200, so as to compress the stent 100 onto the withdrawal delivery rod 200, thereby enabling the stent 100 to move along with the withdrawal delivery rod 200.

[0045] After the stent 100 is released in the body, due to the self-expansion property of the stent 100 itself, the stent 100 is in an expanded state in the body. The in-hook type TIPS stent withdrawal device 10 provided in this embodiment is applicable to the withdrawal of the covered stent 100, especially applicable to the withdrawal of the covered stent 100 in TIPS surgery.

[0046] When the plurality of inner hooks 300 are not opened, the plurality of inner hooks 300 are closed on the withdrawal delivery rod 200, keeping the withdrawal delivery rod 200 tubular. When it is necessary to remove the stent 100 that expands in the body, the tubular withdrawal delivery rod 200 is conveyed to the part of the already expanded stent 100 in the body through a guide wire, then the plurality of inner hooks 300 are opened to enable the plurality of inner hooks 300 to expand, and then the plurality of inner hooks 300 can hook the stent 100, or hook the stent 100 during the process of the plurality of inner hooks 300 closing. After the plurality of inner hooks 300 grip the stent 100, they start to close. At this time, the stent 100 is tightened onto the withdrawal delivery rod 200 under the closing force of the plurality of inner hooks 300. When the outer diameter of the stent 100 is smaller than the inner diameter of the blood vessel, that is, when it completely disengages from the blood vessel lumen, the withdrawal delivery rod 200 and the stent 100 are withdrawn from the human body together, achieving the effect of withdrawing the stent 100.

[0047] "A plurality of inner hooks 300 are arranged at intervals along the length direction of the retractable conveying rod 200", which facilitates the plurality of inner hooks 300 to fully hook the stent 100 along the length direction of the stent 100, so as to compress the stent 100 with uniform force and avoid pulling the stent 100 during the compression process. "The plurality of inner hooks 300 are all rotatably connected to the retractable conveying rod 200". The plurality of inner hooks 300 are used to expand or close during the process of rotating relative to the retractable conveying rod 200. When conveying into the stent 100, the plurality of inner hooks 300 are in a closed state and closed on the retractable conveying rod 200. The plurality of inner hooks 300 are used to correspond to the stent 100 in the expanded state and then hook the stent 100 during the closing process. "The plurality of inner hooks 300 are used to expand when the retractable conveying rod 200 is conveyed to a preset position inside the stent 100". The plurality of inner hooks 300 are in an open state only when they are located at a preset position relative to the stent 100, so that the plurality of inner hooks 300 can correspond to the holes of the stent 100 and the plurality of inner hooks 300 can effectively grip the stent 100.

[0048] During the operation, if the release position of the stent 100 is incorrect or fails to achieve the expected surgical effect, the already released stent 100 can be quickly retracted through this device, which is convenient for continuing the next step of the operation, and the retracted stent 100 does not need to be taken out by other means, effectively improving the safety and success rate of the operation.

[0049] Specifically, the driving method for the expansion or closing of the plurality of inner hooks 300 can adopt a pull-out type or a knob-screwing type.

[0050] Specifically, referring to Figures 1 to 3 , a fluoroscopic ring 400 is provided at the front end of the retractable conveying rod 200 for positioning the device in the blood vessel, so that the inner hook 300 can be accurately connected to the stent 100 when the device is opened. The material of the fluoroscopic ring 400 can be a common fluoroscopic material such as gold / platinum.

[0051] Referring to Figure 3 , in this embodiment, the plurality of inner hooks 300 are arranged in an array along the length direction of the retractable conveying rod 200. The plurality of inner hooks 300 are evenly distributed, which helps to hook the stent 100 with uniform force and avoid damaging the stent 100 during the process of hooking the stent 100. Specifically, the plurality of inner hooks 300 are divided into a first row and a second row, and the first row and the second row are symmetrically arranged with respect to the center of the retractable conveying rod 200.

[0052] Referring to Figure 3 And Figure 4, in this embodiment, the inner hook 300 includes a first end 310 and a second end 320 which are opposite to each other; the first end 310 of the inner hook 300 is rotatably connected to the retraction conveying rod 200, and a traction groove 323 is provided at the second end 320 of the inner hook 300. The traction groove 323 is used to guide the stent 100 to be caught and prevent the stent 100 from withdrawing during the movement of the retraction conveying rod 200, so as to drive the stent 100 to move synchronously.

[0053] The stent 100 is a mesh structure and includes a plurality of braided wires. After a plurality of inner hooks 300 are unfolded, the traction grooves 323 correspond to the braided wires of the stent 100. The traction grooves 323 are used to hook the braided wires of the stent 100, thereby compressing the stent 100 and adjusting the diameter of the released stent 100 so that the stent 100 is separated from the blood vessel for convenient retraction.

[0054] Refer to Figure 3 and Figure 4 , in this embodiment, the traction groove 323 includes a guiding inlet 324 and a limiting opening 326 which are communicated with each other; the guiding inlet 324 is located at the opening of the limiting opening 326. The guiding inlet 324 is used to guide the braided wire of the stent 100 to be caught in the limiting opening 326, and the limiting opening 326 is used to prevent the braided wire of the stent 100 from withdrawing.

[0055] Specifically, the guiding inlet 324 is rectangular, and the limiting opening 326 is trapezoidal. The guiding inlet 324 is communicated with the limiting opening 326. The guiding inlet 324 facilitates the catching of the stent 100, and the limiting opening 326 is used to prevent the inner hook 300 from being separated from the stent 100 during the movement of the retraction conveying rod 200, ensuring that the inner hook 300 tightly holds the stent 100 and smoothly retracts the stent 100 to the outside of the body.

[0056] Refer to Figure 3 and Figure 4 , in this embodiment, the guiding inlet 324 is arranged along the thickness direction of the inner hook 300, and the limiting opening 326 is arranged along the length direction of the inner hook 300; the limiting opening 326 has a limiting notch 327 which is arranged offset along the length direction of the inner hook 300 relative to the guiding inlet 324. The limiting notch 327 is used to prevent the braided wire of the stent 100 from withdrawing.

[0057] Taking Figure 4 the relative positions therein as an introduction, the "thickness direction of the inner hook 300" refers to the direction of arrow A, and the "length direction of the inner hook 300" refers to the direction indicated by arrow B. The limiting notch 327 protrudes to the right relative to the guiding inlet 324. After the stent 100 enters the limiting notch 327, the stent 100 will not easily withdraw from the limiting notch 327 during the movement of the inner hook 300.

[0058] Refer to Figure 3 and Figure 4, in this embodiment, the inlet 324 has an inlet surface 325, and the limit notch 327 has a limit surface 328; the limit surface 328 is arranged at an angle relative to the inlet surface 325 to form a limit notch 327 arranged in a dislocation along the length direction of the inner hook 300.

[0059] For Figure 4 introducing the relative positions in, the inlet surface 325 is a vertical surface, and the limit surface 328 is a surface inclined from the lower left to the upper right.

[0060] Referring to Figure 3 and Figure 4 , in this embodiment, the second end 320 of the inner hook 300 part has a first part 321 and a second part 322 arranged at intervals along the length direction of the inner hook 300; the first part 321 and the second part 322 are respectively used for being stuck into the holes formed between the braided wires of the stent 100, and a traction groove 323 is formed between the first part 321 and the second part 322.

[0061] After the retraction delivery rod 200 moves into the stent 100 and the first part 321 and the second part 322 of the inner hook 300 respectively correspond to the holes of the stent 100, when closing a plurality of inner hooks 300, the plurality of inner hooks 300 grasp the stent 100. The first part 321, the second part 322 and the traction groove 323 are respectively used for grasping the stent 100, which helps to improve the acting force of the plurality of inner hooks 300 for gripping the stent 100, ensure the effective detachment of the stent 100 from the blood vessel, and smoothly retract.

[0062] In this embodiment, a plurality of grooves are provided on the retraction delivery rod 200; the plurality of grooves are respectively used for accommodating a plurality of inner hooks 300, so that when the plurality of inner hooks 300 are closed onto the retraction delivery rod 200, the surface of the inner hook 300 is flush with the surface of the retraction delivery rod 200.

[0063] In the state where the plurality of inner hooks 300 are not opened, the plurality of inner hooks 300 are closed in the plurality of grooves of the retraction delivery rod 200, making the retraction delivery rod 200 maintain a smooth tubular shape. In this way, when the retraction delivery rod 200 is being delivered into the stent 100 in the body, it can not only reduce the delivery difficulty, but also avoid scratching the inner blood vessel wall in the body, and can also avoid irrelevant pulling on the stent 100 other than hooking the stent 100, which affects the retraction of the stent 100.

[0064] An in-hook type TIPS stent withdrawal device 10 provided according to this embodiment, the working principle of the in-hook type TIPS stent withdrawal device 10 is as follows: The in-hook type TIPS stent withdrawal device 10 can be delivered into the already expanded stent 100 inside the body through a guide wire. Locate the position of the stent 100 through angiography. After accurately delivering the in-hook type TIPS stent withdrawal device 10 to the preset position of the stent 100 according to the marking of the imaging ring 400, open multiple in-hooks 300, and release the multiple in-hooks 300 to the hole positions of the braided wires of the stent 100. The set shapes of the multiple in-hooks 300 can fit with the stent 100. After grasping the stent 100, tighten the in-hooks 300. At this time, the stent 100 is tightened onto the withdrawal device by the closing force of the multiple in-hooks 300. When the outer diameter of the stent 100 is smaller than the inner diameter of the blood vessel, that is, when it completely disengages from the blood vessel lumen, the in-hook type TIPS stent withdrawal device 10 and the stent 100 are withdrawn from the human body together.

[0065] An in-hook type TIPS stent withdrawal device 10 provided according to this embodiment has at least the following advantages:

[0066] When not in use, the multiple in-hooks 300 are closed, and the withdrawal delivery rod 200 remains tubular; when in use, release the multiple in-hooks 300. The multiple in-hooks 300 hang on the inner surface of the stent 100. After applying force, the multiple in-hooks 300 retract, and the stent 100 is evenly contracted, reducing the diameter size. Then, the withdrawal delivery rod 200 and the stent 100 are withdrawn from the human body together to achieve the effect of withdrawing the stent 100. If the release position of the stent 100 is incorrect or does not achieve the surgical expected effect, the already released stent 100 can be quickly withdrawn through this device, which is convenient for continuing the next step of the operation. Moreover, the withdrawn stent 100 does not need to be taken out by other means. Usually, it needs to be taken out by means of surgery, effectively improving the safety and success rate of the operation.

[0067] The embodiment of the present invention also provides an in-hook type TIPS stent withdrawal system, including a stent 100 and an in-hook type TIPS stent withdrawal device 10. Multiple in-hooks 300 are used to hook the stent 100. The shape or quantity of the multiple in-hooks 300 can be set according to the structure of the stent 100, so that it is more accurate and effective during withdrawal. It can improve the problem that the stent 100 cannot be withdrawn after release.

[0068] An embodiment of the present invention further provides an inner-hooking TIPS stent withdrawal method, which is implemented by using an inner-hooking TIPS stent withdrawal device 10 and includes the following steps: Step S1, a plurality of inner hooks 300 are closed onto the withdrawal delivery rod 200 and are conveyed into the internally expanded stent 100 in the body along with the withdrawal delivery rod 200; Step S2, the plurality of inner hooks 300 are unfolded and hook the stent 100 during the closing process to compress the stent 100 onto the withdrawal delivery rod 200; Step S3, the withdrawal delivery rod 200 drives the compressed stent 100 to withdraw. The problem that the stent 100 cannot be withdrawn after being released can be improved.

[0069] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An internal-hooking TIPS stent retraction device, characterized in that, it includes: a retraction delivery rod (200) and a plurality of internal hooks (300); the retraction delivery rod (200) is used to be delivered into the interior of the stent (100) that expands in the body; the plurality of internal hooks (300) are arranged at intervals along the length direction of the retraction delivery rod (200) on the retraction delivery rod (200), and the plurality of internal hooks (300) are all rotatably connected to the retraction delivery rod (200); the plurality of internal hooks (300) are used to close onto the retraction delivery rod (200) during the process of the retraction delivery rod (200) being delivered into the interior of the stent (100), or the plurality of internal hooks (300) are used to expand when the retraction delivery rod (200) is delivered to a preset position inside the stent (100), and hook the stent (100) during the process of closing onto the retraction delivery rod (200), so as to compress the stent (100) onto the retraction delivery rod (200), thereby enabling the stent (100) to move along with the retraction delivery rod (200); the internal hook (300) includes a first end (310) and a second end (320) that are opposite in position; the first end (310) of the internal hook (300) is rotatably connected to the retraction delivery rod (200), and a traction groove (323) is provided at the second end (320) of the internal hook (300), and the traction groove (323) is used to guide the stent (100) to be caught in and prevent the stent (100) from withdrawing during the movement of the retraction delivery rod (200), so as to drive the stent (100) to move synchronously.

2. The internal-hooking TIPS stent retraction device according to claim 1, characterized in that: the plurality of internal hooks (300) are arranged in an array along the length direction of the retraction delivery rod (200).

3. The internal-hooking TIPS stent retraction device according to claim 1, characterized in that: the traction groove (323) includes a guiding inlet (324) and a limiting opening (326) that are communicated with each other; the guiding inlet (324) is located at the opening of the limiting opening (326), the guiding inlet (324) is used to guide the braided wire of the stent (100) to be caught in the limiting opening (326), and the limiting opening (326) is used to prevent the braided wire of the stent (100) from withdrawing.

4. The internal-hooking TIPS stent retraction device according to claim 3, characterized in that: the guiding inlet (324) is arranged along the thickness direction of the internal hook (300), and the limiting opening (326) is arranged along the length direction of the internal hook (300); the limiting opening (326) has a limiting notch (327) that is offset along the length direction of the internal hook (300) relative to the guiding inlet (324), and the limiting notch (327) is used to prevent the braided wire of the stent (100) from withdrawing.

5. The internal-hooking TIPS stent retraction device according to claim 4, characterized in that: The inlet (324) has an inlet surface (325), and the limit notch (327) has a limit surface (328); the limit surface (328) is arranged at an angle relative to the inlet surface (325) to form the limit notch (327) that is staggeredly arranged along the length direction of the inner hook (300).

6. The inner hook type TIPS stent withdrawal device according to claim 5, characterized in that: The second end (320) of the inner hook (300) part has a first part (321) and a second part (322) that are arranged at intervals along the length direction of the inner hook (300); the first part (321) and the second part (322) are respectively used to be stuck into the holes formed between the braided wires of the stent (100), and a traction groove (323) is formed between the first part (321) and the second part (322).

7. The inner hook type TIPS stent withdrawal device according to any one of claims 1-6, characterized in that: A plurality of grooves are provided on the withdrawal conveying rod (200); the plurality of grooves are respectively used to accommodate the plurality of inner hooks (300), so that when the plurality of inner hooks (300) are closed to the withdrawal conveying rod (200), the surface of the inner hook (300) is flush with the surface of the withdrawal conveying rod (200).

8. An inner hook type TIPS stent withdrawal system, characterized in that it includes a stent (100) and the inner hook type TIPS stent withdrawal device according to any one of claims 1-7, and the plurality of inner hooks (300) are used to hook the stent (100).

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