A recyclable support system

Abstract

This invention provides a retrievable stent system, belonging to the field of vascular interventional medical device technology. The system includes a stent body, an intermediate catheter, a microcatheter, and a grasping component. The stent body has radially contracted and expanded states to support the target location of the blood vessel. A retrieval rod is located at the proximal end of the stent body. The intermediate catheter is used to receive the stent body in its contracted state. The microcatheter is slidably disposed within the intermediate catheter. The grasping component is slidably disposed within the microcatheter and has a drive wire and a retrieval part, with the retrieval part located at the distal end of the drive wire. When the stent body is retrieved, the microcatheter moves through the intermediate catheter towards the proximal end of the stent body. The retrieval part retrievals the retrieval rod, reducing the distance between the retrieval rod and the microcatheter, thus pressing the retrieval rod against the distal end of the microcatheter to fix it in place. Ultimately, the stent body is retrieved into the lumen of the intermediate catheter. This system primarily addresses the technical problem of the inability to safely retrieve stents in existing technologies.

Description

Technical Field

[0001] This invention belongs to the field of vascular interventional medical device technology, specifically relating to a retrievable stent system. Background Technology

[0002] In modern clinical medicine, vascular diseases, especially stenosis or blockage of blood vessels caused by atherosclerosis, pose a serious threat to human health. Long-term plaque buildup in arteries can narrow the lumen of blood vessels, restricting blood flow and leading to a series of symptoms such as chest pain and limb ischemia. If the condition continues to progress, it may also induce fatal complications such as heart attacks and strokes, severely impacting the patient's life and quality of life.

[0003] To alleviate vascular blockage and maintain vascular patency, stent implantation has become one of the core treatment methods commonly used in clinical practice. As a crucial interventional medical device, the core function of a stent is to provide support at sites of vascular stenosis or blockage, preventing elastic recoil and effectively restoring local blood flow, thus creating conditions for the patient's vascular function repair. Traditionally used clinical stents are mostly mesh metal tube structures. After implantation, these stents fit tightly against the inner wall of the blood vessel to achieve a supporting effect. However, due to the limitations of their structural design, once implanted, they cannot be retrieved. Long-term retention in the body may lead to potential risks such as vascular wall hyperplasia, in-stent restenosis, and inflammatory reactions, posing hidden dangers to the patient's subsequent health.

[0004] While some retrievable stents exist in existing technologies, such as the Solitaire stent, their design involves using an operating rod at one end to capture thrombi within the blood vessel and then retrieving the stent by pulling it back. However, the core function of such stents is focused on thrombus capture; they do not possess the characteristic of long-term retention in the body to provide support. They can only target and capture larger, fixed thrombi within the blood vessel, failing to meet the dual requirements of vascular support and subsequent retrieval, and cannot achieve continuous filtration and collection of mobile thrombi in the blood.

[0005] In clinical treatment scenarios, some patients need to have their stents removed after their vascular support needs are met in stages to avoid the risks of long-term retention. This cannot meet the clinical need of "periodically leaving the stent in the body to provide support before safely retrieving it." This technological gap has brought many limitations to the precision treatment of vascular diseases.

[0006] Therefore, developing a stent that can remain in the human body for a certain period of time, effectively provide vascular support, and can be safely retrieved later has become an urgent technical problem to be solved in this field. Summary of the Invention

[0007] The purpose of this invention is to provide a recyclable stent system to solve the technical problem that stents in the prior art cannot be safely recycled.

[0008] To achieve the above objectives, the recyclable support system of the present invention provides the following technical solution: A recyclable scaffold system comprising: The stent body has a radially contracted state and an expanded state for supporting the target location of the blood vessel, and the proximal end of the stent body has a retrieval rod; Intermediate conduit, which is used to house the stent body in its contracted state; Microcatheter, which is slidably positioned inside the intermediate catheter; A gripping component is slidably disposed within the gripping cavity of the microcatheter. The gripping component has a drive wire and a slinging part, with the slinging part disposed at the distal end of the drive wire. During stent body retrieval, the microcatheter moves towards the proximal end of the stent body through the intermediate catheter. The retrieval part retrieves the retrieval rod and reduces the distance between the retrieval rod and the microcatheter so that the retrieval rod presses against the distal end of the microcatheter to fix the retrieval rod, ultimately retrieving the stent body into the lumen of the intermediate catheter.

[0009] As a further optimized technical solution, the sleeve part has two sleeves symmetrically arranged along the drive wire. The adjacent sides of the two sleeves are respectively fixedly connected to the drive wire to form a hinge structure that is arranged oppositely and can be opened and closed relative to each other. The drive wire has a drive part for driving the recovery rod to fall into the two sleeves at the position where the two sleeves are fixed.

[0010] As a further optimized technical solution, at least the middle part of the recovery rod is a magnetic structure, and the driving part is made of a material that attracts the magnetic structure.

[0011] As a further optimized technical solution, at least the distal end of the grasping lumen of the microcatheter has a flat section to drive the two loops away from the drive wire to move closer to each other.

[0012] As a further optimized technical solution, the flat section of the microcatheter has locking ports for placing the two ends of the retrieval rod.

[0013] As a further optimized technical solution, the locking port has wedge-shaped portions on both sides to guide the recovery rod to smoothly enter the locking port.

[0014] As a further optimized technical solution, the retrievable stent system also includes a distal embolization intercept stent, which is used to release at the distal end of the stent body to prevent thrombus escape during the stent body retrieval process.

[0015] As a further optimized technical solution, the microcatheter also has a receiving cavity along the axial direction for accommodating a distal embolization interception stent, and the receiving cavity is arranged independently of the flat lumen.

[0016] As a further optimized technical solution, the distal end of the flat section can be bent to one side to be closer to the recovery rod.

[0017] As a further optimized technical solution, the stent body has a cylindrical support portion, and the proximal end of the support portion is provided with a tapered sidewall whose radial dimension gradually decreases from the distal end to the proximal end, so that the opening at the proximal end of the stent body is elliptical, and the retrieval rod is arranged at the proximal end of the tapered sidewall.

[0018] Beneficial Effects: This invention, through the design of a grasping component with a specific retrieval structure, a microcatheter, and a retrieval rod located proximal to the stent body, allows for effective retrieval of the stent after the stent has completed its therapeutic function. The grasping component then effectively retrieves the retrieval rod, which is then pressed against the distal end of the microcatheter to secure it. Finally, by moving the intermediate catheter distally, the stent body is retrieved into the intermediate catheter, ultimately achieving effective retrieval of the stent body. This solves the problem of traditional stents being unable to be removed after treatment. The stent body can stably expand at the vascular lesion site, providing regular and reliable luminal support to meet the phased treatment needs of vascular stenosis recanalization and blood flow reconstruction. Furthermore, it can be completely retrieved after the treatment cycle, avoiding long-term complications such as intimal hyperplasia, in-stent restenosis, chronic inflammation, and foreign body reactions caused by permanent stent implantation. It is particularly suitable for clinical scenarios requiring temporary vascular support followed by subsequent removal, significantly improving the flexibility and safety of treatment plans.

[0019] Furthermore, the retrieval unit adopts a multi-coordinated locking design with hinged loops, precise magnetic alignment, flat lumen clamping, and locking support. The magnetic drive unit achieves precise alignment between the retrieval rod and the retrieval unit, effectively overcoming alignment deviations caused by vascular curvature and blood flow disturbance. The hinged loops achieve reliable clamping under the constraint of the flat lumen of the microcatheter, and together with the locking support for limiting the end of the retrieval rod, a double fixation is formed, fundamentally preventing stent slippage and displacement during retrieval, significantly improving the retrieval success rate and operational reliability in complex vascular environments.

[0020] Furthermore, by setting up an independently retractable distal embolization interception stent, it can be released and deployed at the distal end of the stent during stent retrieval. During the stent retrieval stage, it can effectively intercept and collect thrombi, plaque fragments, and other debris generated by stent closure and intimal friction, thus preventing serious complications of distal vascular embolism from the source. The protective net and the grasping component are arranged independently in a dual-lumen configuration within the microcatheter, so that the delivery, release, and retrieval operations do not interfere with each other. This improves safety, simplifies the surgical procedure, and reduces operational complexity.

[0021] Furthermore, the proximal end of the stent body adopts a conical sidewall combined with an elliptical opening design, which not only facilitates the stent's retraction and closure, allowing it to smoothly enter the intermediate catheter for retrieval, but also optimizes the stress distribution during retrieval, avoiding local stress concentration. The distal section of the microcatheter with a flat lumen has bending capability, allowing it to approach the retrieval rod more flexibly and improving operational adaptability. Attached Figure Description

[0022] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein: Figure 1 This is a schematic diagram of the working state of Embodiment 1 of the recyclable support system of the present invention; Figure 2 This is a schematic diagram of the support body structure of Embodiment 1 of the recyclable support system of the present invention; Figure 3 This is a schematic diagram showing the engagement state of the intermediate catheter, microcatheter, and gripping component in Embodiment 1 of the recyclable stent system of the present invention. Figure 4 This is a schematic diagram showing the engagement state of the microcatheter and the gripping component in Embodiment 1 of the recyclable stent system of the present invention. Figure 5 This is a schematic diagram of one end face of the gripping component of Embodiment 1 of the recyclable support system of the present invention. At this time, the two collars are in an open state. Figure 6 This is a schematic diagram showing the state of the gripping component taking over the recycling rod in Embodiment 1 of the recyclable support system of the present invention; Figure 7 Examples of various end faces of the gripping cavity in Embodiment 1 of the recyclable support system of the present invention, wherein, Figure 7 (a) is shaped like a fish's mouth. Figure 7 (b) is elliptical. Figure 7 (c) is a perfectly circular grasping cavity with a flat section; Figure 8 This is a schematic cross-sectional view of the microcatheter body of Embodiment 1 of the recyclable stent system of the present invention; Figure 9 This is a schematic diagram of the operation of Embodiment 1 of the recyclable support system of the present invention, wherein, Figure 9 (a) To ensure that the gripping components are completely housed within the gripping cavity, Figure 9 (b) The gripping component is partially housed within the gripping cavity. Figure 9 (c) The gripping component grips the recovery rod. Figure 9 (d) Press the retrieval lever against the distal end of the microcatheter for gripping components; Figure 10 for Figure 9 (a) is a schematic diagram of the end face of the gripping cavity; Figure 11 for Figure 9 (d) is a schematic diagram of the end face of the gripping cavity; Figure 12 This is a schematic diagram illustrating the operation of the gripping component fixing the recycling rod in Embodiment 2 of the recyclable support system of the present invention, wherein... Figure 12 (a) shows the position after the recovery rod and the sleeve are magnetically attracted. Figure 12 (b) The recovery rod is positioned near the wedge. Figure 12 (c) The recovery rod is located inside the locking port.

[0023] In the figure: 100, stent body; 110, support part; 120, conical sidewall; 130, connecting wire; 200, retrieval rod; 300, intermediate guide tube; 400, microcatheter; 410, grasping cavity; 411, locking port; 412, wedge-shaped part; 420, storage cavity; 500, grasping component; 510, drive wire; 511, drive part; 520, retrieval part; 521, collar; 600, distal embolization interception stent; 700, microguide wire. Detailed Implementation

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0025] In the description of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," 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 the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "connected" and "linked" used in this invention should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; they can refer to a direct connection or an indirect connection through intermediate components. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. Furthermore, the term "proximal end" uniformly refers to the end closer to the operator, while "distal end" refers to the end farther from the operator.

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0027] The shapes and sizes of the components in the accompanying drawings do not reflect the actual proportions of the product; they are only intended to illustrate the content of the invention.

[0028] To address the technical problem of non-retrievable stents after treatment in existing technologies, this invention provides a retrievable stent system, primarily used for interventional treatment of intracranial or peripheral blood vessels. Its core feature is the ability to safely retrieve a deployed stent that has fulfilled its supporting function. The system includes a stent body 100, an intermediate catheter 300, a microcatheter 400, a grasping component 500, and a distal embolization interception stent 600. The stent body 100 can switch between a radially contracted state and an expanded state. When expanded, it supports the target location of the blood vessel, and its proximal end is equipped with a retrieval rod 200. The intermediate catheter 300 is used to receive the stent body 100 in its contracted state. The microcatheter 400 is slidably disposed within the intermediate catheter 300 in its grasping cavity 410. The grasping component 500 is slidably disposed within the microcatheter 400. The grasping component 500 includes a drive wire 510 and a distal retrieval part 520, which is used to loop and fix the retrieval rod 200. When retrieving the stent body 100, the microcatheter 400 moves proximally to the stent body 100, and the retrieval part 520 retrieval rod 200. By pulling the microcatheter 400 distally, the retrieval rod 200 is pressed and fixed to the distal end of the microcatheter 400, thus facilitating the retrieval of the stent body 100 into the intermediate catheter 300. The retrieval part 520 adopts a symmetrical hinge-type loop structure, which, together with the magnetic drive part 511, achieves precise alignment. The flat section of the microcatheter 400 and the locking port 411 form a double lock. The distal embolization intercepting stent 600 is released at the distal end of the stent body 100 before the stent body 100 is retrieved to prevent thrombus escape during retrieval. This invention combines vascular support and safe retrieval functions, with reliable grasping and fixation, effectively reducing long-term complications and intraoperative embolism risks. It is suitable for various clinical scenarios requiring temporary vascular support, is easy to operate, and is highly practical.

[0029] Example 1 like Figure 1 As shown, the recyclable stent system includes a stent body 100, an intermediate catheter 300, a microcatheter 400, a gripping component 500, and a distal embolization interception stent 600.

[0030] The stent body 100 is made of medical-grade nickel-titanium alloy or polymer materials, possessing excellent radial support and shape memory properties. During interventional delivery, it remains in a radially contracted, small-sized state. Upon reaching the target vascular location, it switches to an expanded state through temperature or self-expansion, conforming to the vascular wall and providing continuous support to the narrowed area. Figure 2As shown, the stent body 100 includes a cylindrical support portion 110. The surface of the support portion 110 is provided with a regularly distributed perforated grid, which can reduce irritation to the blood vessel wall while ensuring support strength. A conical sidewall 120 is integrally formed at the proximal end of the support portion 110. The radial dimension of the conical sidewall 120 gradually decreases from the distal end to the proximal end, forming an elliptical opening at the proximal end of the stent body 100. A retrieval rod 200 is fixedly mounted at the proximal end of the conical sidewall 120 via a connecting wire 130. In this embodiment, the retrieval rod 200, as the core force-bearing component of the retrieval operation, is a rod-shaped structure with a square cross-section, and its middle part is fixedly connected to the conical sidewall 120 via a connecting wire. The structural design of the conical sidewall 120 allows the stent body 100 to be smoothly retracted and inserted into the intermediate catheter 300 during retrieval, and also provides a stable connection base for the retrieval rod 200.

[0031] like Figure 3 As shown, the intermediate catheter 300 is a flexible long catheter made of medical polymer material, which has sufficient axial pushing force and radial compressive strength. Its inner diameter is larger than the maximum outer diameter of the stent body 100 in the contracted state. It is used to accommodate the contracted stent body 100 during the delivery stage and push it to the lesion site. During the retrieval stage, it serves as a channel for storing the stent body 100 and realizes the complete retraction of the stent body 100.

[0032] like Figure 4 , Figure 8 As shown, the microcatheter 400 is slidably disposed within the lumen of the intermediate catheter 300, and can be independently pushed and retracted axially with the intermediate catheter 300. It has two independent lumens, one of which is a grasping cavity 410. A grasping component 500 is slidably disposed within the grasping cavity 410 of the microcatheter 400. The grasping component 500 specifically includes a drive wire 510 and a sleeve portion 520. The drive wire 510 is a medical-grade ultra-elastic metal wire with excellent pushing and pulling properties, and its proximal end extends outside the body for operator manipulation. The sleeve portion 520 is fixed to the distal end of the drive wire 510 and has two symmetrically arranged collars 521. The adjacent sides of the two collars 521 are respectively fixedly connected to the drive wire 510, forming a hinge structure that can be opened and closed relative to each other. In this embodiment, both collars 521 are fixedly connected to the drive wire 510 by welding. In addition, the two collars 521 are made of elastic material, have a certain degree of flexibility, and can deform. The two collars 521 are pre-machined into an open state with a certain included angle during production. At this time, if... Figure 5 , Figure 6As shown, the included angle between the two collars 521 is 60-90°, which facilitates the retrieval of the recovery rod 200 when in the open state. After the recovery rod 200 is retrieved, the microcatheter 400 is pushed proximally and distally, causing the two collars 521 to gradually enter the grasping cavity 410. Under the pressure of the sidewall of the grasping cavity 410, the two collars 521 move closer together on the side away from the drive wire 510, forming a closed state. The two collars 521 then gradually move from both ends of the recovery rod 200 to the middle. When the retrieval rod 200 abuts against the distal end face of the microcatheter 400, it is pushed towards the distal end of the collar 521 by the combined action of the distal end face of the microcatheter 400 and the drive wire 510, until it simultaneously abuts against the distal inner wall of the collar 521 and the distal end of the microcatheter 400. At this time, both ends of the retrieval rod 200 are pressed against the end face of the microcatheter 400, and then the intermediate catheter 300 is pushed distally, which can realize the gradual retraction of the stent body 100 into the intermediate catheter 300. Preferably, in order to ensure that the two collars 521 are closer to each other to retrieve the retrieval rod 200, at least the distal end of the grasping cavity 410 of the microcatheter has a flat section. In this embodiment, the grasping cavity 410 is a flat tube as a whole. Specifically, as shown below... Figure 7 As shown, Figure 7 (a) shows an end view of the grasping cavity 410 in this embodiment. At this time, the end face is fish-mouth shaped. Figure 7 (b) Shows an end view of another form of the grasping cavity 410 as a flat tube, in which case the end face is elliptical; Figure 7 (c) shows an end view of a gripping cavity 410 in other embodiments where only the distal section is a flat tube. In this case, the flat section forms a flat tube for driving the two collars 521 to move closer to each other, and the proximal end of the gripping cavity 410 is a circular tube. This shows that as long as the distal end of the gripping cavity 410 has a flat tube section for driving the two collars 521 to move closer to each other, the shape of other positions of the gripping cavity 410 can be designed according to specific needs.

[0033] Furthermore, to facilitate the smooth placement of the retrieval rod 200 within the collar 521 and ensure that the middle portion of the retrieval rod 200 approximately rests on the drive wire 510 between the two collars 521, the middle portion of the retrieval rod 200 is magnetic. A drive section 511 is provided on the drive wire 510 at the connection point with the collar 521. The drive section 511 can be a magnetic component or made of a material that attracts the magnetic structure of the retrieval rod 200. Thus, when the microcatheter 400 approaches the retrieval rod 200, magnetic attraction drives the retrieval rod 200 to precisely fall into the area between the two collars 521. During the falling process, the falling direction of the retrieval rod 200 can be adjusted using the proximal portions of the two collars 521, ensuring that the retrieval rod 200 falls between the two collars 521 in a direction perpendicular to the drive wire 510, thereby completing the initial retrieval. Preferably, to avoid interfering with the proximal end of the collar 521, a stop component (not shown in the figure) can be laterally provided at the proximal end of the drive unit 511. This allows the retrieval rod 200 to be attracted to the drive unit 511 in a manner perpendicular to the drive wire 510. Simultaneously, to avoid interference with the smooth pushing of the retrieval rod 200 to the distal end of the collar 521, the length of the stop component is less than the inner diameter of the distal end of the microcatheter 400 parallel to the direction of the retrieval rod 200. In this embodiment, the drive unit 511 is specifically arranged at the furthest lateral distance on the side of the two collars 521 that is relatively far from the drive wire 510, facilitating the direct entry of the retrieval rod 200 into the two collars 521. In this embodiment, the two collars 521 have an irregular arc-shaped structure, with the furthest lateral distance between them located in the middle towards the distal end. Furthermore, during processing, this position can be made as close to the distal end as possible without affecting normal use, thereby ensuring the stability of the retrieval rod 200's state during the tightening of the collar 521 after the retrieval rod 200 is retrieved. Correspondingly, the drive unit 511 is arranged on the drive wire 510 located at the far end of the middle of the two collars 521.

[0034] Furthermore, the distal end face of the flat section of the microcatheter 400 is provided with a locking port 411, which communicates with the grasping cavity 410 and has a width slightly larger than the diameter of the retrieval rod 200, for supporting both ends of the retrieval rod 200; wedge-shaped portions 412 are integrally provided on both sides of the locking port 411, which gradually open towards the distal end to form a guide slope, guiding the retrieval rod 200 to slide smoothly into the locking port 411 during the retrieval operation, thereby effectively reducing the difficulty of alignment.

[0035] Another lumen of the intermediate catheter 300 is the receiving lumen 420, which is specifically used to receive the distal embolization interception stent 600. The distal embolization interception stent 600 is a retractable and releasable filter structure. After being released, it unfolds in the distal blood vessel of the stent body 100. During the retrieval process of the stent body 100, it effectively intercepts detached thrombi, plaques and other debris, preventing them from flowing with the blood flow and causing distal blood vessel embolism.

[0036] Furthermore, the distal end of the flattened section of the microcatheter 400 can be bent to one side to approach the retrieval rod 200. Specifically, the inner sidewall of the flattened section has a metal braided layer for support. The braided layer can be made of an elastic material. During manufacturing, the distal end of the grasping cavity 410 is pre-processed into a shape bent to one side. This way, when the microcatheter 400 is delivered within the intermediate catheter 300, the degree of bending is small due to the restriction of the inner sidewall of the intermediate catheter 300, allowing it to move smoothly along the intermediate catheter 300. When the distal end extends out of the intermediate catheter 300, it forms a pre-set bending state under its own elastic force. Alternatively, the braided layer can also be made of a metal material with a memory effect. When delivered within the intermediate catheter 300, the distal end does not bend. When the distal end extends out of the intermediate catheter 300 and comes into direct contact with the blood, the braided layer gradually deforms under the stimulation of body temperature, thus bending to one side as pre-set during manufacturing, to better approach and conform to the retrieval rod 200 on the blood vessel wall.

[0037] like Figure 9 , Figure 10 , Figure 11 As shown, the specific operation flow of this embodiment is as follows: The distal embolization intercepting stent 600 in its constricted state is loaded within the microcatheter 400. After the system is delivered to the target location in the blood vessel under the guidance of the microguidewire 700, the microcatheter 400 is first moved along the interior of the stent body 100 to the distal end of the stent body 100, and then the microcatheter 400 is withdrawn. The distal embolization intercepting stent 600 expands and deploys on its own, supporting itself against the blood vessel wall.

[0038] When the stent body 100 needs to be retrieved, the operator pushes the microcatheter 400 from the proximal end, moving it forward along the intermediate catheter 300 until its distal end extends beyond the intermediate catheter 300 and approaches the retrieval rod 200. Figure 9 As shown in (a).

[0039] Then, the grasping component 500 is pushed forward, causing the sleeve portion 520 to extend beyond the distal end of the microcatheter 400, and the extended portions of the two collars 521 naturally open. Figure 9 As shown in (b), the magnetic attraction between the drive unit 511 and the retrieval rod 200 attracts the middle of the retrieval rod 200, guiding it between the two collars 521. Figure 9 As shown in (c). The specific engagement state of the recovery rod 200 and the sleeve part 520 can also be referred to... Figure 6 , Figure 6 The image shows the state in which the retrieval rod 200 is adsorbed onto the drive unit 511. It should be noted that in this embodiment, the retrieving part 520 partially extends out of the microcatheter 400 when retrieving the retrieval rod 200. Figure 6For the purpose of showing the cooperation state, the take-up part 520 is shown as fully extended with the microcatheter fully extended, which does not represent the actual retrieval state.

[0040] The microcatheter 400 is then pushed distally, causing the retrieval part 520 and the retrieval rod 200 to be retracted together into the grasping cavity 410. Under the constraint of the flat cavity in the flat section, the collar 521 closes and tightly grips the retrieval rod 200, while both ends of the retrieval rod 200 slide into the locking port 411. Figure 9 As shown in (d), this achieves dual fixation.

[0041] The relative positions of the fixed drive wire 510 and the microcatheter 400 are fixed, and the intermediate catheter 300 is pushed distally, so that the stent body 100 gradually retracts and enters the lumen of the intermediate catheter 300. At the same time, the distal embolization intercepting stent 600 intercepts thrombus fragments. After the stent body 100 is completely retracted into the intermediate catheter 300, the intermediate catheter 300, the microcatheter 400, the stent body 100 and the distal embolization intercepting stent 600 are withdrawn from the body together, completing the entire retrieval operation.

[0042] Example 2 This embodiment provides a recovery rod with a different structure, such as Figure 12 As shown, in this embodiment, the retrieval rod 200 is a rod-shaped structure with a circular cross-section. To ensure stability after the drive unit 511 attracts the retrieval rod 200, the drive unit 511 is an arc-shaped groove adapted to the retrieval rod 200, and the depth of the arc-shaped groove is no greater than the radius of the retrieval rod 200. This facilitates the engagement of the collar 521 with the end face of the gripping cavity 410 during the fixing of the retrieval rod 200, pushing the retrieval rod 200 out of the arc-shaped groove to move it to the far end of the collar 521. In this embodiment, the engaging port 411 is also an arc-shaped groove adapted to the retrieval rod 200, and the depth of the arc-shaped groove is also no greater than the radius of the retrieval rod 200. It should also be noted that in this embodiment, a stop component is not required on one side of the drive unit 511.

[0043] In summary, the retrievable stent system provided by this invention integrates temporary vascular support and safe retrieval through structural design. Combined with a precise grasping and locking mechanism and a thrombus protection structure, it effectively improves the safety and effectiveness of interventional therapy, solves the technical problems of traditional stents being unable to be retrieved, having unreliable retrieval structures, and being prone to complications, and has high clinical application value.

[0044] It is understood that the above description is merely exemplary and the embodiments of this application do not limit the scope of the application.

[0045] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are within the protection scope of the present invention.

Claims

1. A recyclable support system, characterized in that, include: The stent body (100) has a radially contracted state and an expanded state for supporting the target location of the blood vessel, and the stent body (100) has a retrieval rod (200) at its proximal end. Intermediate conduit (300) for receiving the stent body (100) in a contracted state. Microcatheter (400), the microcatheter (400) is slidably disposed within intermediate catheter (300); A gripping component (500) is slidably disposed within the gripping cavity (410) of the microcatheter (400). The gripping component (500) has a drive wire (510) and a sleeve portion (520), the sleeve portion (520) being disposed at the distal end of the drive wire (510). When the stent body (100) is retrieved, the microcatheter (400) moves towards the proximal end of the stent body (100) through the intermediate catheter (300). The retrieval part (520) retrievals the retrieval rod (200). By reducing the distance between the retrieval rod (200) and the microcatheter (400), the retrieval rod (200) presses against the distal end of the microcatheter (400) to fix the retrieval rod (200). Finally, the stent body (100) is retrieved into the lumen of the intermediate catheter (300). The take-up part (520) has two collars (521) symmetrically arranged along the drive wire (510). The adjacent sides of the two collars (521) are fixedly connected to the drive wire (510) to form a hinge structure that is arranged opposite to each other and can be opened and closed. The drive wire (510) has a drive part (511) for driving the retraction rod (200) to fall into the two collars (521) at the position where the two collars (521) are fixed. At least the grasping lumen (410) of the microcatheter (400) has a flattened section at its distal end to drive the two loops (521) away from the side of the drive wire (510) to move closer to each other; The flat section of the microcatheter (400) has locking ports (411) for placing the two ends of the retrieval rod (200).

2. The recyclable support system according to claim 1, characterized in that, At least the middle part of the recovery rod (200) is a magnetic structure, and the drive part (511) is made of a material that attracts the magnetic structure.

3. The recyclable support system according to claim 1, characterized in that, The locking port (411) has wedge-shaped portions (412) on both sides to guide the recovery rod (200) to smoothly enter the locking port (411).

4. The recyclable support system according to claim 1, characterized in that, The retrievable stent system also includes a distal embolization intercept stent (600) for release at the distal end of the stent body (100) to prevent thrombus escape during stent body (100) retrieval.

5. The recyclable support system according to claim 4, characterized in that, The microcatheter (400) also has a receiving cavity (420) along the axial direction for accommodating a distal embolization interception stent (600), the receiving cavity (420) being arranged independently of the grasping cavity (410).

6. The recyclable support system according to claim 5, characterized in that, The distal end of the flat section can be bent to one side for proximity to the recovery rod (200).

7. The recyclable support system according to any one of claims 1-6, characterized in that, The stent body (100) has a cylindrical support portion (110), and the proximal end of the support portion (110) is provided with a tapered sidewall (120) whose radial dimension gradually decreases from the distal end to the proximal end, so that the opening at the proximal end of the stent body (100) is elliptical, and the recovery rod (200) is arranged at the proximal end of the tapered sidewall (120).

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