Stent and plugging integrated aneurysm embolism stent

Abstract

The invention relates to the technical field of aneurysm embolism stents, in particular to a stent and plugging integrated aneurysm embolism stent. According to the embolism stent, a self-expansion mesh basket is arranged on one side of the middle of a stent body, the embolism stent is released after being conveyed to a blood vessel where an aneurysm is located, the stent body is expanded firstly, the stent body is supported in the blood vessel firstly, then the self-expansion mesh basket is expanded again, and the large end of the self-expansion mesh basket extends into the aneurysm; the small head end is located at the aneurysm neck opening position, so that the self-expansion net basket can block the aneurysm neck opening of the aneurysm, the self-expansion net basket blocks blood flow in the aneurysm, immediate blocking is achieved, the risk of aneurysm rupture in the treatment process is reduced, and the long-term recurrence rate is possibly reduced; and the operation of the spring ring in the aneurysm is avoided, so that the risk that the spring ring protrudes into the aneurysm carrying artery or punctures the aneurysm is fundamentally eliminated.

Description

Technical Field

[0001] This application relates to the field of aneurysm embolization stent technology, and in particular to an aneurysm embolization stent that integrates stent and occlusion. Background Technology

[0002] An aneurysm is an abnormal, permanent bulge in a blood vessel wall caused by local weakness or injury, commonly found in intracranial arteries, the aorta, and other similar locations. Pathologically, it resembles a "balloon" or "vascular bomb" forming on a blood vessel, with the aneurysm wall experiencing far greater blood flow impact (wall shear force) than normal blood vessels. Once the aneurysm wall ruptures due to the pressure, it leads to severe bleeding (such as subarachnoid hemorrhage or internal bleeding), with extremely high mortality and disability rates, seriously endangering the patient's life.

[0003] Currently, endovascular interventional treatment for aneurysms has become the mainstream method due to its minimally invasive nature and rapid recovery. Among these, the two most widely used technical approaches are: Simple coil embolization: Microcoils are inserted into the aneurysm sac through a microcatheter to induce thrombus formation, thereby occluding the aneurysm. However, for wide-necked aneurysms, the coils are prone to dislodge into the parent artery, leading to complications such as thrombosis, and the long-term recurrence rate is relatively high.

[0004] Stent-assisted coil embolization involves first deploying a fine-mesh stent at the parent artery to act as a "fence" blocking the neck of the aneurysm. Then, a microcatheter is inserted through the stent's mesh to fill the aneurysm with coils. While this method solves the treatment challenge of wide-necked aneurysms, the procedure is complex, time-consuming, requires significant technical experience, and carries the risk of in-stent thrombosis.

[0005] Therefore, there is a need to provide an improved technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0006] The purpose of this application is to provide an aneurysm embolization stent that integrates stenting and occlusion, in order to solve or alleviate the problems existing in the prior art.

[0007] To achieve the above objectives, this application provides the following technical solution: An aneurysm embolization stent that integrates stenting and occlusion, the embolization stent comprising: The stent body is a tubular structure and is used to support the blood vessel where the aneurysm is located. The self-expanding basket has a small end and a large end at its two ends, with the size of the self-expanding basket gradually increasing from the small end to the large end; the large end of the self-expanding basket is used to extend into the aneurysm, and the small end is located at the neck of the aneurysm. The small end of the self-expanding basket is fixed to one side of the middle part of the support body.

[0008] In the aforementioned stent and occlusion integrated aneurysm embolization stent, preferably, the central axis of the self-expanding basket is perpendicular to the central axis of the stent body.

[0009] Preferably, in the stent and the integrated aneurysm embolization stent described above, the mesh density at both ends of the stent body is greater than the mesh density in the middle.

[0010] In the aforementioned stent and occlusion integrated aneurysm embolization stent, preferably, the mesh density of the self-expanding basket is greater than the mesh density at both ends of the stent body.

[0011] Preferably, in the case of the stent and the integrated aneurysm embolization stent described above, the self-expanding basket is hemispherical.

[0012] Preferably, in the stent and occlusion integrated aneurysm embolization stent described above, a fixing hole is provided in the middle of the stent body, and the small end of the self-expanding basket is installed in the fixing hole of the stent body.

[0013] Preferably, in the stent and the integrated aneurysm embolization stent described above, the stent body has multiple suture holes around the fixing hole, and the large end of the self-expanding basket is temporarily sewn onto the suture holes by sutures.

[0014] Preferably, in the stent and the integrated aneurysm embolization stent described above, multiple contrast points are provided around the multiple suture holes on the stent body.

[0015] Preferably, in the case of the stent and the integrated aneurysm embolization stent described above, the stent body is made of a shape memory alloy tube by laser engraving.

[0016] In the aforementioned stent and occlusion integrated aneurysm embolization stent, preferably, the small end of the self-expanding basket is fixed in the fixing hole of the stent body by laser welding.

[0017] Compared with the closest prior art, the technical solution of this application has the following beneficial effects: In this embolization stent, a self-expanding basket is placed on one side of the middle part of the stent body. After the embolization stent is delivered to the blood vessel where the aneurysm is located, it is released. The stent body first expands to support the main stent body in the blood vessel. Then the self-expanding basket expands, so that the large end of the self-expanding basket extends into the aneurysm, and the small end is located at the neck of the aneurysm. This allows the self-expanding basket to block the neck of the aneurysm, thereby blocking the blood flow within the aneurysm and achieving immediate occlusion. This reduces the risk of aneurysm rupture during treatment and may reduce the long-term recurrence rate. It also avoids the need to manipulate coils within the aneurysm, fundamentally eliminating the risk of coils protruding into the parent artery or puncturing the aneurysm.

[0018] In other words, this embolization stent has the functions of both a stent and an occlusion basket. The surgical treatment can be completed in one delivery and release, which greatly simplifies the surgical procedure, shortens the operation time, and reduces the radiation exposure time for both doctors and patients. It also reduces the number of surgical instruments used and lowers medical costs. Moreover, this embolization stent is particularly suitable for treating cases such as wide-necked aneurysms and fusiform aneurysms that are difficult to embolize with traditional coils. In other words, this embolization stent has a wide range of application prospects. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein: Figure 1 This is a schematic diagram of an embolization stent in an aneurysm vessel according to some embodiments of this application; Figure 2 This is a schematic diagram of a support body provided according to some embodiments of this application; Figure 3 This is a schematic diagram of a self-expanding basket sewn onto a support body according to some embodiments of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Support body; 11. Fixing hole; 12. Suture hole; 13. Imaging point; 2. Self-expanding basket; 3. Suture thread. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] The present application 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 in the embodiments of the present application can be combined with each other.

[0024] According to specific embodiments of this application, such as Figure 1-3 As shown, this application provides an aneurysm embolization stent that integrates stenting and occlusion. The embolization stent includes: a stent body 1, which is a tubular structure and is used to support the aneurysm in the blood vessel.

[0025] The self-expanding basket 2 has a small end and a large end at its two ends, with the size of the self-expanding basket 2 gradually increasing from the small end to the large end. The large end of the self-expanding basket 2 is used to extend into the aneurysm, while the small end is located at the neck of the aneurysm.

[0026] The small end of the self-expanding basket 2 is fixed to one side of the middle part of the support body 1.

[0027] In this embolization stent, a self-expanding basket 2 is placed on one side of the middle part of the stent body 1. After the embolization stent is delivered to the blood vessel where the aneurysm is located, it is released. The stent body 1 expands first, so that the main stent body is supported in the blood vessel. Then the self-expanding basket 2 expands, so that the large end of the self-expanding basket 2 extends into the aneurysm, and the small end is located at the neck of the aneurysm. This allows the self-expanding basket to block the neck of the aneurysm, thereby blocking the blood flow in the aneurysm and achieving immediate occlusion. This reduces the risk of aneurysm rupture during treatment and may reduce the long-term recurrence rate. It also avoids the need to operate coils in the aneurysm, fundamentally eliminating the risk of coils protruding into the aneurysm-bearing artery or puncturing the aneurysm.

[0028] In other words, this embolization stent has the functions of both a stent and an occlusion basket. The surgical treatment can be completed in one delivery and release, which greatly simplifies the surgical procedure, shortens the operation time, and reduces the radiation exposure time for both doctors and patients. It also reduces the number of surgical instruments used and lowers medical costs. Moreover, this embolization stent is particularly suitable for treating cases such as wide-necked aneurysms and fusiform aneurysms that are difficult to embolize with traditional coils. In other words, this embolization stent has a wide range of application prospects.

[0029] The central axis of the self-expanding basket 2 is perpendicular to the central axis of the stent body 1. In this embodiment, the self-expanding basket is located radially at the middle position of the stent body 1, and the central axis of the self-expanding basket 2 is perpendicular to the central axis of the stent body 1. This arrangement makes the position of the stent body 1 and the self-expanding basket 2 more consistent with the location distribution of blood vessels and aneurysms; and the fact that the self-expanding basket is located in the middle of the stent body 1 allows the stent body 1 to support the self-expanding basket 2 more evenly.

[0030] The mesh density at both ends of the support body 1 is greater than that in the middle. In this embodiment, the mesh size at both ends of the support body 1 is smaller and the mesh is more densely arranged; while the mesh size in the middle of the support body 1 is larger and the mesh is more sparsely arranged, thus making the mesh density at both ends of the support body 1 greater than that in the middle.

[0031] A denser mesh is provided at both ends of the stent body 1 to ensure that both ends of the stent body 1 have sufficient structural strength, so that the two ends of the stent body 1 can be more stably and reliably supported in the tumor-bearing vessel, ensuring that the entire embolization stent is more stably and accurately anchored.

[0032] The stent body 1 has a large mesh in the middle so that the stent body 1 can maximize the blood flow of the branch vessels when crossing the bifurcation of the blood vessels; at the same time, a structure with a fixed expansion mesh is integrated in the middle of the stent body 1 to achieve the dual treatment goal of aneurysm embolization and branch vessel embolization.

[0033] The mesh density of the self-expanding basket 2 is greater than that of the two ends of the stent body 1. In this embodiment, the self-expanding basket is made of shape memory metal, and the mesh density of the self-expanding basket 2 is much greater than that of the two ends of the stent body 1. That is, the self-expanding basket 2 has a dense mesh structure. This design allows the self-expanding basket 2 to effectively block the neck of the aneurysm to prevent blood from flowing into the aneurysm.

[0034] In other embodiments, a membrane may be provided on the self-expanding basket 2 to ensure that the self-expanding basket has good sealing performance.

[0035] The self-expanding basket 2 is hemispherical. In this embodiment, the self-expanding basket is hemispherical, the small end of the self-expanding basket 2 is the smallest end of the hemispherical structure, and the large end of the self-expanding basket 2 is the position where the diameter of the hemispherical structure is the largest.

[0036] In other embodiments, the self-expanding mesh basket can also be configured as a mushroom umbrella shape or a mesh basket shape.

[0037] A fixing hole 11 is provided in the middle of the support body 1, and the small end of the self-expanding mesh basket 2 is installed in the fixing hole 11 of the support body 1. In this embodiment, the fixing hole 11 of the support body 1 is a circular hole, and the small end of the self-expanding mesh basket can be inserted into the fixing hole 11 in part, so that the self-expanding mesh basket 2 is more firmly fixed on the support body 1.

[0038] Multiple suture holes 12 are provided around the fixing hole 11 on the main body 1 of the stent. The larger end of the self-expanding basket 2 is temporarily sewn to the suture hole 12 by suture thread 3. In this embodiment, when the embolization stent is not released, the larger end of the entire self-expanding basket 2 is temporarily sewn to the suture hole 12 of the main body 1 by suture thread 3, so that the entire self-expanding basket 2 is sewn and compressed onto the main body 1, which makes it easier to compress the self-expanding basket 2 and transport the entire embolization stent.

[0039] In this embodiment, four suture holes 12 are provided around the fixing hole 11 on the bracket body 1, and the suture thread 3 sutures the large end of the self-expanding basket 2 to the four suture holes 12.

[0040] Multiple imaging points 13 are provided around the multiple suture holes 12 on the stent body 1. In this embodiment, the multiple imaging points 13 around the multiple suture holes 12 on the stent body 1 make it easier to position the self-expanding basket 2, so that the self-expanding basket 2 can be released more accurately to the aneurysm location.

[0041] The stent body 1 is made of a shape memory alloy tube by laser engraving. In this embodiment, the stent body 1 is made of a nickel-titanium alloy tube by laser engraving, which ensures that the stent body 1 has excellent self-expansion performance and flexibility, so that the stent body 1 can better adapt to the tortuous vascular structure after compression.

[0042] The small end of the self-expanding mesh basket 2 is fixed in the fixing hole 11 of the bracket body 1 by laser welding. In this embodiment, the small end of the self-expanding mesh basket 2 is fixed in the fixing hole 11 of the bracket body 1 by laser welding, so as to achieve rigid anchoring between the self-expanding mesh basket and the bracket body 1 and ensure the firmness of the fixation between the self-expanding mesh basket 2 and the bracket body 1.

[0043] The procedure for using this embolization stent is as follows: During the procedure, the operator first delivers a microcatheter delivery system pre-loaded with the embolization stent to the target lesion area under guidewire guidance. Once the contrast marker at the tip of the delivery system accurately crosses and covers the neck of the aneurysm, the microcatheter is kept stable, and the outer cannula is withdrawn. The distal end of the stent body 1 self-expands and is anchored to the healthy carrier artery segment distal to the aneurysm. Continued withdrawal of the outer cannula causes the proximal end of the stent body 1 to be released and anchored to the proximal healthy vessel segment, thus achieving fixation at both ends of the stent body 1.

[0044] When the outer tube is retracted to the central imaging marker area, the surgeon actively pulls the pre-installed release suture 3 backward. This operation directly releases the constraint on the large end of the self-expanding basket 2. Once the suture 3 is released, the previously constrained self-expanding basket 2 automatically releases due to its shape memory effect, rapidly expands and unfolds towards the aneurysm neck, and conformally embeds itself into the aneurysm neck.

[0045] Once fully deployed, the expanded and formed occlusive structure acts like a tight plug, completely covering the aneurysm neck and immediately blocking blood flow into the aneurysm sac. Simultaneously, the patent stent body 1 continues to maintain normal hemodynamics in the parent artery, achieving the dual therapeutic goals of embolization and blood flow preservation.

[0046] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A stent for embolizing an aneurysm, characterized in that, The embolization stent includes: The stent body is a tubular structure and is used to support the blood vessel where the aneurysm is located. The self-expanding basket has a small end and a large end at its two ends, with the size of the self-expanding basket gradually increasing from the small end to the large end; the large end of the self-expanding basket is used to extend into the aneurysm, and the small end is located at the neck of the aneurysm. The small end of the self-expanding basket is fixed to one side of the middle part of the support body.

2. The aneurysm embolization stent integrating stent and occlusion according to claim 1, characterized in that, The central axis of the self-expanding basket is perpendicular to the central axis of the support body.

3. The aneurysm embolization stent integrating stent and occlusion according to claim 1, characterized in that, The mesh density at both ends of the support body is greater than that in the middle.

4. The aneurysm embolization stent integrating stent and occlusion according to claim 3, characterized in that, The mesh density of the self-expanding basket is greater than the mesh density at both ends of the support body.

5. The aneurysm embolization stent integrating stent and occlusion according to claim 4, characterized in that, The self-expanding basket is hemispherical.

6. The aneurysm embolization stent integrating stent and occlusion according to claim 1, characterized in that, A fixing hole is provided in the middle of the support body, and the small end of the self-expanding basket is installed in the fixing hole of the support body.

7. The aneurysm embolization stent integrating stent and occlusion according to claim 6, characterized in that, The bracket body has multiple suture holes around the fixing holes, and the large end of the self-expanding basket is temporarily sewn onto the suture holes by suture thread.

8. The aneurysm embolization stent integrating stent and occlusion according to claim 7, characterized in that, Multiple imaging points are provided around the multiple suture holes on the main body of the support.

9. The aneurysm embolization stent integrating stent and occlusion according to claim 6, characterized in that, The main body of the support is made of a tube of shape memory alloy through laser engraving.

10. The aneurysm embolization stent integrating stent and occlusion according to claim 6, characterized in that, The small end of the self-expanding basket is fixed in the fixing hole of the bracket body by laser welding.

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