Vascular embolization device

Abstract

The invention relates to the technical field of medical instruments, in particular to a blood vessel embolism device which comprises a pushing assembly and an embolism ball assembly located at the far end of the pushing assembly, the pushing assembly and the embolism ball assembly are preset in a micro catheter, and the pushing assembly is used for pushing the embolism ball assembly out of the micro catheter and releasing the embolism ball assembly. The embolism ball assembly is coiled to form a spherical embolism structure after being pushed out of the microcatheter; wherein the embolism ball assembly comprises a ball shell, a ball core and an inner tail which are sequentially connected from the far end to the near end, the ball shell can be coiled to form a hollow spherical basket-shaped structure after being pushed out of the microcatheter, and the hollow spherical basket-shaped structure can be filled with the ball core after being pushed out of the microcatheter to form a spherical embolism structure; the pushing assembly comprises a pushing rod and an outer tail, the near end of the outer tail is connected with the far end of the pushing rod, the far end of the outer tail is connected with the near end of the inner tail, a disengagement point is arranged at the joint of the far end of the outer tail and the near end of the inner tail, and the outer tail is used for adjusting the position of the microcatheter head when the microcatheter is pushed out. The blood vessel embolism device can improve the safety when the spherical embolism structure is released.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a vascular embolization device. Background Art

[0002] Interventional therapy is a series of technologies that use puncture needles, catheters and other interventional equipment to introduce specific instruments into the lesion site of the human body through natural channels or tiny incisions under the guidance and monitoring of imaging equipment such as digital subtraction angiography, CT, ultrasound and magnetic resonance imaging. It is one of the important treatment methods for vascular diseases. Some diseases require permanent or temporary closure of blood vessels. Currently, the available methods / consumables are generally the following four:

[0003] 1) Coil embolization: The coil is filled into the target blood vessel through a microcatheter, which can physically block the blood flow and completely close the lumen by further promoting blood coagulation. This structure has the following disadvantages: First, the diameter of the coil is fixed. During the packing process, as the space is constantly occupied by the coil, it is necessary to continuously replace it with a new smaller coil until it is completely embolized; second, the previously filled coil cannot be recovered; third, if the coils are not sufficiently wound around each other, the small coil may escape; fourth, the coil wire is too strong, and it is difficult to determine the position of the microcatheter in the later stage of packing; fifth, the microcatheter head originally in the center of the lumen is often pulled and pressed against the vessel wall by the tension of the coil during the packing process. The use of coils requires continuous delivery of new sizes of consumables. When pushing a new coil, the "dagger effect" of the coil easily punctures the vessel wall and causes bleeding; sixth, when the coil is released, the position of the microcatheter head is often close to the vessel wall, resulting in a greater risk of subsequent operations.

[0004] 2) WEB embolization: The consumables are filled into the target blood vessel cavity through a microcatheter. The dense metal-covered mesh structure can be used to reduce blood flow into the lumen, and blood coagulation can be further promoted to completely close the lumen. However, this type of embolism has a fixed shape and is less effective in embolizing irregular lumens. It cannot embolize high-risk bubble-like structures, and its thrombogenic effect is inferior to that of spring coils. It is not suitable for diseases other than aneurysms, and its long-term efficacy is still uncertain.

[0005] 3) Implantation of blood flow guiding device: By implanting a dense mesh stent, the blood flow direction in the aneurysm-bearing artery is changed to reduce or lower the blood flow impact in the aneurysm, so as to achieve the purpose of blood retention and thrombosis in the aneurysm, and finally form new endothelial cells on the surface of the blood flow guiding device and the neck of the aneurysm, so as to achieve complete occlusion and cure of the aneurysm. Its disadvantages are: the risk of thrombosis in the stent is high, long-term intensive antiplatelet aggregation therapy (long-term medication) is required, and the cost is extremely high, which is not suitable for diseases other than aneurysms.

[0006] 4) Balloon occlusion: Use a micro-guidewire to deliver the balloon catheter to the target blood vessel, inject diluted contrast agent into the balloon, fill the balloon, occupy the blood vessel cavity, and temporarily block the blood flow. This form of embolism must be assisted by a micro-guidewire to reach the target area. If the micro-guidewire cannot reach a far enough position, it cannot be used. In addition, the balloon catheter is hard in texture, and it is difficult to get into position in the tortuous blood vessels. Even if it is in place, it is difficult to fully fill. In most cases, it cannot be released and needs to be withdrawn from the body after use. Summary of the invention

[0007] The object of the present invention is to provide a vascular embolization device to at least solve one of the problems existing in the existing vascular embolization structure.

[0008] In order to achieve the above-mentioned object, the present invention provides a vascular embolization device, comprising a pushing assembly and an embolization ball assembly located at the distal end of the pushing assembly, wherein the pushing assembly and the embolization ball assembly are preset in a microcatheter, and the pushing assembly is used to push the embolization ball assembly out of the microcatheter and release it, and the embolization ball assembly is pushed out of the microcatheter to coil up a spherical embolization structure; wherein,

[0009] The embolic ball assembly comprises a ball shell, a ball core and an inner tail connected in sequence from the distal end to the proximal end, the ball shell can be coiled to form a hollow spherical basket structure after being pushed out of the microcatheter, and the ball core can be filled with the hollow spherical basket structure to form the spherical embolic structure after being pushed out of the microcatheter;

[0010] The pushing assembly includes a pushing rod and an outer tail, wherein the proximal end of the outer tail is connected to the distal end of the pushing rod, and the distal end of the outer tail is connected to the proximal end of the inner tail, and a release point is provided at the connection, and the outer tail is used to adjust the position of the microcatheter head when being pushed out of the microcatheter.

[0011] Optionally, the developability of the spherical shell is stronger than that of the spherical core.

[0012] Optionally, the texture of the inner tail is softer than that of the spherical embolic structure.

[0013] Optionally, the texture of the outer tail is harder than that of the spherical embolic structure.

[0014] Optionally, the inner tail and the outer tail are both developable, and the release point is non-developable.

[0015] Optionally, a release marking point is provided at the microcatheter head, and a release mark is provided on the pushing rod, and when the distal end of the release mark coincides with the release marking point, the inner tail is just completely pushed out of the microcatheter.

[0016] Optionally, the length of the release mark is equal to the length of the outer tail, and when the proximal end of the release mark coincides with the release mark point, the outer tail is completely pushed out of the microcatheter.

[0017] Optionally, the release marker is developable.

[0018] Optionally, the spherical shell adopts a spring ring structure.

[0019] Optionally, the spherical shell and the spherical core are made of the same material and are both composed of a composite of platinum-tungsten alloy winding wire and polypropylene core wire.

[0020] The vascular embolization device provided by the present invention has at least one of the following beneficial effects:

[0021] 1) In the process of pushing the embolic ball assembly by using the pushing assembly, as the ball core continuously fills the hollow spherical basket structure formed by the ball shell, the position of the microcatheter head gradually moves closer to the ball center, and the position of the microcatheter head is safer when released. In addition, by adding an outer tail at the distal end of the pushing rod, the position of the microcatheter head can be adjusted to improve the safety of the spherical embolic structure when released;

[0022] 2) The vascular embolization device provided by the present invention can be applied to interventional embolization treatment of vascular diseases that require permanent or temporary closure of blood vessels, such as aneurysm embolization, arteriovenous fistula embolization, traumatic arterial rupture embolization, balloon occlusion experiments, etc., and has a wide range of applications;

[0023] 3) A unique design is adopted in terms of development. For example, the development of the spherical shell is stronger than that of the spherical core, so as to better distinguish the two. At the same time, the release point is designed to be non-developable, so as to distinguish the inner tail from the outer tail, thereby improving the visualization and safety of interventional embolization treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Those skilled in the art should understand that the drawings are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0025] Figure 1 This is an initial schematic diagram of the vascular embolization device provided in Example 1 of the present invention;

[0026] Figure 2 A schematic diagram of a spherical embolic structure provided in Embodiment 1 of the present invention;

[0027] Figure 3 A schematic diagram of a microcatheter provided in a preferred embodiment of the present invention being delivered into place;

[0028] Figure 4This is a schematic diagram of a spherical shell filled with the preferred embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of a ball core after filling provided in a preferred example 1 of the present invention;

[0030] Figure 6 A schematic diagram of embolization of an aneurysm subsac provided in the second preferred embodiment of the present invention;

[0031] Figure 7 A schematic diagram of embolization of a wide-necked aneurysm by stent-assisted embolization provided in preferred example 3 of the present invention;

[0032] Figure 8 A schematic diagram of embolization for temporarily closing a blood vessel provided in preferred example 4 of the present invention;

[0033] Fig. 9 This is a schematic diagram of embolism for ruptured blood vessels and bleeding provided in preferred example five of the present invention.

[0034] in:

[0035] 101-spherical embolic structure; 102-spherical shell; 103-spherical core; 104-inner tail; 201-push rod; 202-outer tail; 203-release point; 204-release marker; 300-microcatheter; 400-aneurysm; 401-daughter sac; 500-stent; 501-wide-necked aneurysm; 502-protected blood vessel; 600-blood vessel; 700-vascular rupture. DETAILED DESCRIPTION

[0036] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, please refer to the accompanying drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Any modification of the structure, change in the proportional relationship or adjustment of the size, under the same or similar conditions as the effects that can be produced by the present invention and the purposes that can be achieved, should still fall within the scope of the technical content disclosed by the present invention.

[0037] As used in the present invention, the singular forms "one", "an", and "the" include plural objects, unless the content clearly indicates otherwise. As used in the present invention, the term "or" is generally used in a sense that includes "and / or", unless the content clearly indicates otherwise. As used in the present invention, the term "several" is generally used in a sense that includes "at least one", unless the content clearly indicates otherwise. As used in the present invention, the term "at least two" is generally used in a sense that includes "two or more", unless the content clearly indicates otherwise. In addition, the terms "first", "second", and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", and "third" may explicitly or implicitly include one or at least two of the features.

[0038] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Please refer to Figure 1 and Figure 2 This embodiment provides a vascular embolization device, including a push assembly and an embolization ball assembly located at the distal end of the push assembly, the push assembly and the embolization ball assembly are preset in a microcatheter, the push assembly is used to push the embolization ball assembly out of the microcatheter and release it, and the embolization ball assembly is pushed out of the microcatheter to coil a spherical embolization structure 101; wherein,

[0040] The embolic ball assembly includes a ball shell 102, a ball core 103 and an inner tail 104 connected in sequence from the distal end to the proximal end. The ball shell 102 can be coiled into a hollow spherical basket structure after being pushed out of the microcatheter. The ball core 103 can fill the hollow spherical basket structure to form a spherical embolic structure 101 after being pushed out of the microcatheter.

[0041] The pushing assembly includes a pushing rod 201 and an outer tail 202. The proximal end of the outer tail 202 is connected to the distal end of the pushing rod 201, and the distal end of the outer tail 202 is connected to the proximal end of the inner tail 104. A release point 203 is provided at the connection. The outer tail 202 is used to adjust the position of the microcatheter head when being pushed out of the microcatheter.

[0042] The vascular embolization device provided in this embodiment can be applied to interventional embolization treatment of vascular diseases that require permanent or temporary closure of blood vessels, such as aneurysm embolization, arteriovenous fistula embolization, traumatic arterial rupture embolization, balloon occlusion experiments, etc.

[0043] In the process of pushing the embolic ball assembly by the pushing assembly, as the ball core 103 continuously fills the hollow spherical basket structure formed by the ball shell 102, the position of the microcatheter head gradually moves closer to the ball center, and the position of the microcatheter head is safer when released. In addition, by adding an outer tail 202 at the distal end of the pushing rod 201, the position of the microcatheter head can be adjusted, thereby improving the safety of the spherical embolic structure 101 when released.

[0044] Specifically, in the present embodiment, in the initial state, the pushing assembly and the embolic ball assembly are linearly preset in a microcatheter, and a release point 203 is provided at the connection between the embolic ball assembly and the pushing assembly. The embolic ball assembly is released when it is pushed out of the microcatheter, at which time the release point 203 is disconnected, the embolic ball assembly is separated from the pushing assembly, the embolic ball assembly is implanted in the body, and the pushing assembly is not implanted in the body.

[0045] It should be noted that the "proximal end" and "distal end" mentioned in this application refer to the relative position, location, and direction of the components or actions relative to each other from the perspective of the doctor using the medical device. The "proximal end" usually refers to the end of the medical device that is close to the doctor during normal operation, while the "distal end" usually refers to the end that is away from the doctor and first enters the patient's body. The microcatheter head refers to the distal end of the microcatheter.

[0046] In this embodiment, the ball shell 102 is located at the distal end of the embolic ball assembly and is preferentially pushed out of the microcatheter. It is a three-dimensional structure of the outermost circle of the spherical embolic structure 101. When fully unfolded, it can coil into a hollow spherical basket-like structure. Preferably, the ball shell 102 adopts a spring coil structure, and its material can be composed of a composite of platinum-tungsten alloy winding wire and polypropylene core wire, which has better thrombogenicity. Of course, conventional materials such as nickel-titanium alloy can also be used, and this application does not limit this.

[0047] After the ball core 103 is connected to the ball shell 102, the ball shell 102 is completely pushed out of the microcatheter and then the ball core 103 is pushed out. The ball core 103 is coiled in the hollow spherical basket structure, and as the pushed out length increases, the coiled diameter gradually decreases until the tumor is almost completely filled. Preferably, the material of the ball core 103 is the same as that of the ball shell 102, and is also composed of a composite of platinum tungsten alloy winding wire and polypropylene core wire.

[0048] The inner tail 104 is located at the proximal end of the embolic ball assembly and is designed with strong imaging to facilitate easy viewing of the position of the microcatheter. A release point 203 is provided at the proximal end of the inner tail 104 .

[0049] Preferably, the texture of the inner tail 104 is softer than that of the spherical embolic structure 101 to reduce the risk of tailing.

[0050] Preferably, the developing property of the ball shell 102 is stronger than that of the ball core 103. The ball shell 102 is designed with strong developing properties, such as coating the surface with strong developing materials, so that the ball shell 102 and the hollow spherical basket-shaped structure wound out are more intensely developed under X-ray fluoroscopy, while the ball core 103 is designed with weak developing properties, such as coating the surface with weak developing materials, so that the ball core 103 and the wound spherical structure are thinner and lighter in X-ray fluoroscopy, so as to better distinguish the two.

[0051] In this embodiment, the outer tail 202 is an arc-shaped metal wire located at the release point 203 at the distal end of the push assembly, which is harder than the material of the embolic ball structure and can be pushed out when the tail is closed, and the microcatheter head is swung to a desired position (close to the center of the lumen) by using torque. Of course, when the position of the microcatheter head is close to the center of the lumen, the outer tail 202 can be released directly without being pushed out, and after release, the outer tail 202 is withdrawn from the body along with the push rod 201.

[0052] Preferably, the outer tail 202 is designed with strong development, and the release point 203 is non-developing, with a blank space, so that the outer tail 202 and the inner tail 104 can be directly distinguished by the naked eye.

[0053] In this embodiment, the push rod 201 is made of a harder metal wire with greater toughness and support, and is used to push the embolic ball assembly into or out of the target blood vessel along the inner cavity of the microcatheter.

[0054] Furthermore, a release mark point is provided at the microcatheter head, and a release mark 204 is provided on the pushing rod 201. When the distal end of the release mark 204 coincides with the release mark point, the inner tail 104 is completely pushed out of the microcatheter.

[0055] Furthermore, the length of the release mark 204 is equal to the length of the outer tail 202. When the proximal end of the release mark 204 coincides with the release mark point, the outer tail 202 is completely pushed out of the microcatheter.

[0056] In this embodiment, the release mark 204 has a developing property, and the push rod 201 only develops the release mark 204 under X-ray fluoroscopy, while other areas are not developed.

[0057] The technical concept of the present invention is further illustrated by several specific examples below.

[0058] Preferred example 1:

[0059] The vascular embolization device provided by the present invention is used for interventional embolization treatment of aneurysms, and the specific operation is as follows:

[0060] 1) First, put the microcatheter 300 into place, such as Figure 3 As shown;

[0061] 2) If Figure 4 As shown, the embolic ball assembly is then pushed into the target aneurysm 400, the ball shell 102 is coiled along the aneurysm wall to form a basket, and the ball core 103 is continuously pushed in. If the position is not ideal, the embolic ball assembly can be slowly retrieved by pulling back the push rod 201, and then slowly pushed forward again to re-place the embolic ball assembly;

[0062] 3) If Figure 5 As shown, after the ball core 103 is completely pushed in, the aneurysm 400 is embolized and the inner tail 104 is pushed in. At this time, the distal end of the release mark 204 of the push rod 201 coincides with the release mark point of the microcatheter 300, and the release is performed. The release point 203 is disconnected, and the embolization ball assembly remains in the aneurysm 400. The push rod 201 is withdrawn from the body, and the microcatheter head is still in the blood vessel, and further packing can be performed if necessary.

[0063] If the microcatheter tip is found to be in an unfavorable position during the final stage (e.g. Figure 5 If the outer tail 202 is pushed forward, the position of the microcatheter head is adjusted under the torsion of the outer tail 202. At this time, the distal end of the release mark 204 of the push rod 201 exceeds the release mark point on the microcatheter 300, but the proximal end of the release mark 204 cannot exceed the release mark point of the microcatheter 300. Then, the embolic ball assembly is released, and the outer tail 202 is withdrawn from the body. The embolic effect is the same as before, but the position of the microcatheter head is significantly better than before.

[0064] Preferred example 2:

[0065] like Figure 6 As shown, when the aneurysm 400 has a complex structure, such as having several daughter capsules 401, the embolic ball assembly can be used to fill the aneurysm 400 body to stabilize it into a basket. When filling the ball core 103, the diameter of the ball core 103 gradually decreases to be similar to the diameter of the daughter capsule 401, and when the microcatheter head is facing the vesicle, the tension of the microcatheter 300 can be adjusted to fill the subsequent ball core 103 into the daughter capsule 401. The main body can be filled subsequently, and there is no risk of over-selection into the daughter capsule 401 during the embolization process. The embolic ball assembly is an integral structure, and the implants in the daughter capsule 401 and the main body will not be separated, and the implants in the daughter capsule 401 will not escape.

[0066] Preferred example three:

[0067] like Figure 7As shown, the stent 500 assists in embolizing a wide-necked aneurysm 501, and a normal protected blood vessel 502 exists at the neck of the aneurysm. A microcatheter 300 can be placed at the starting part of the protected blood vessel 502, and firstly temporarily sealed with an embolic ball assembly, and then another microcatheter 300 is used to deliver the embolic ball assembly into the body of the wide-necked aneurysm 501. During the embolization process of the wide-necked aneurysm 501 body, since the spherical embolic structure 101 occupies the space at the starting part of the protected blood vessel 502, subsequent embolic materials will not enter the protected blood vessel 502. After the embolization of the wide-necked aneurysm 501 body is completed, the embolic ball assembly at the mouth of the protected blood vessel 502 can be withdrawn.

[0068] Example 4:

[0069] like Figure 8 As shown, the embolic ball assembly is used to temporarily occlude the blood vessel 600, such as in the balloon occlusion experiment BOT, and the spherical embolic structure 101 is more effective than a conventional balloon (the tortuous blood vessel 600 cannot be put in place or cannot be filled smoothly) and a spring coil (a single spring coil is difficult to completely occlude the blood vessel 600, and multiple spring coils can occlude the blood vessel 600 but cannot be recovered).

[0070] Example 5:

[0071] like Fig. 9 As shown, when a blood vessel ruptures and bleeds, the embolic ball assembly can be used to block the blood vessel rupture 700, and can be withdrawn after thrombosis is formed and bleeding stops. If the blood vessel rupture 700 cannot heal itself, the embolic ball assembly can be released to permanently block the blood vessel. Its use effect is better than that of a balloon (which can block the blood vessel rupture 700 but cannot be permanently retained if bleeding does not stop) and a coil (a single coil is difficult to completely block the blood vessel rupture 700, and multiple coils can permanently block the blood vessel but cannot be withdrawn).

[0072] In summary, the embodiment of the present invention provides a vascular embolization device. In the process of using the push assembly to push the embolization ball assembly, as the ball core 103 continuously fills the hollow spherical basket-like structure coiled by the ball shell 102, the position of the microcatheter head gradually moves closer to the center of the ball, and the position of the microcatheter head is safer when released. In addition, by adding an outer tail 202 at the distal end of the push rod 201, it can be used to adjust the position of the microcatheter head, thereby improving the safety of the spherical embolization structure 101 when released. The vascular embolization device can be used for interventional embolization treatment of vascular diseases that require permanent or temporary closure of blood vessels, such as aneurysm embolism, arteriovenous fistula embolism, traumatic arterial rupture embolism, balloon occlusion experiments, etc., and has a wide range of applications.

[0073] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the technical content disclosed above can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still belongs to the scope of protection of the technical solution of the present invention.

Claims

1. A vascular embolization device, characterized in that: It comprises a pushing assembly and an embolic ball assembly located at the distal end of the pushing assembly, wherein the pushing assembly and the embolic ball assembly are preset in a microcatheter, the pushing assembly is used to push the embolic ball assembly out of the microcatheter and release it, and the embolic ball assembly is pushed out of the microcatheter to coil up a spherical embolic structure; wherein, The embolic ball assembly comprises a ball shell, a ball core and an inner tail connected in sequence from the distal end to the proximal end, the ball shell can be coiled to form a hollow spherical basket structure after being pushed out of the microcatheter, and the ball core can be filled with the hollow spherical basket structure to form the spherical embolic structure after being pushed out of the microcatheter; The pushing assembly includes a pushing rod and an outer tail, wherein the proximal end of the outer tail is connected to the distal end of the pushing rod, and the distal end of the outer tail is connected to the proximal end of the inner tail, and a release point is provided at the connection, and the outer tail is used to adjust the position of the microcatheter head when being pushed out of the microcatheter.

2. The vascular embolization device according to claim 1, characterized in that: The shell has a stronger developability than the core.

3. The vascular embolization device according to claim 1, characterized in that: The texture of the inner tail is softer than that of the spherical embolic structure.

4. The vascular embolization device according to claim 1 or 3, characterized in that: The texture of the outer tail is harder than that of the spherical embolic structure.

5. The vascular embolization device according to claim 1, characterized in that: The inner tail and the outer tail are both developable, and the release point is non-developable.

6. The vascular embolization device according to claim 1, characterized in that: A release mark point is arranged at the head of the microcatheter, and a release mark is arranged on the pushing rod. When the distal end of the release mark coincides with the release mark point, the inner tail is just completely pushed out of the microcatheter.

7. The vascular embolization device according to claim 6, characterized in that: The length of the release mark is equal to the length of the outer tail. When the proximal end of the release mark coincides with the release mark point, the outer tail is completely pushed out of the microcatheter.

8. The vascular embolization device according to claim 1, characterized in that: The release marker has a developing property.

9. The vascular embolization device according to claim 1, characterized in that: The spherical shell adopts a spring ring structure.

10. The vascular embolization device according to claim 1, characterized in that: The ball shell and the ball core are made of the same material and are both composed of a composite of platinum-tungsten alloy winding wire and polypropylene core wire.

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