A occluder and occluding system

Abstract

The present invention provides an occluder and an occluding system, the occluding system comprising the occluder and a stent; the stent is implanted in the true cavity of aortic dissection and has a pore thereon; the occluder comprises an axially connected anchoring portion and an embolization portion, the anchoring portion comprises a first coil assembly, the embolization portion comprises a second coil assembly, the embolization portion is used to pass through the pore on the stent and then extend into the false cavity from the rupture of aortic dissection, the anchoring portion is arranged in the inner cavity of the stent, and the occluder is connected to the stent. The occluding system can avoid dislocation or displacement of the occluder, and also avoid secondary damage to the blood vessel wall, and has a good therapeutic effect.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an occluder and an occluding system. Background Art

[0002] Aortic dissection refers to the blood in the aorta entering the aortic media from the tear in the aortic intima, causing the media to separate and expand along the long axis of the aorta to form a state of separation between the true and false lumens of the aortic wall. The current treatment for aortic dissection is mainly endovascular aortic repair (EVAR), which generally uses a covered stent to block the tear in the dissection, reconstruct the true lumen vascular pathway, reduce blood flow in the false lumen, and cause thrombosis of the false lumen.

[0003] EVAR mainly covers the proximal end, or extends to the distal end. For the distal rupture of aortic dissection, the current treatment methods are mainly to achieve ideal aortic remodeling through simultaneous or staged treatment. However, clinical studies have found that the number of ruptures at the distal end of aortic dissection is large, and the pathology is more complicated. Most patients have more than three ruptures at the distal end of the dissection, which is more difficult to treat. At the same time, most of the distal ruptures are located in the visceral area of ​​the abdominal aorta, where there are branch arteries, so intravascular treatment is more difficult. Moreover, due to the existence of distal ruptures, it is difficult to achieve ideal thrombosis of the false lumen. The false lumen of some patients develops and continues to grow and form aneurysms, or even ruptures.

[0004] In view of this, false lumen tamponade is often used in the prior art to promote false lumen thrombosis. False lumen tamponade can be performed using coils. Due to the large number of distal breaches in the false lumen and the large volume of the cavity, a large number of coils are needed clinically to achieve dense tamponade, which leads to difficulties in clinical operation and high medical expenses. Moreover, the traditional coils have no fixing device after release, and there is a risk of displacement in the false lumen, which reduces the success rate of treatment. Some improved coils are pre-connected to the bare stent and are synchronously delivered to the body with the bare stent for release. However, this type of coil has a large transport resistance during delivery and is prone to entanglement during release, which affects the positioning accuracy of the coil. In addition, the coiling morphology of the coil is uncontrolled and relatively loose, and cannot be coiled at the breach, which reduces its blocking effect at the breach. In other improved coil structures, the coil is connected to the bare stent through an anchor hook after release, but the anchor hook is easily dislocated and deviates from the predetermined position, and the anchor hook is also prone to damage the vascular wall, causing secondary damage to the vascular wall. Summary of the invention

[0005] The object of the present invention is to provide an occluder and an occluding system, wherein the occluder can be accurately released at a predetermined position and firmly anchored to prevent long-term displacement and avoid damage to the blood vessel wall.

[0006] To achieve the above objective, the present invention provides an occluder, comprising an anchoring portion and an embolization portion which are axially connected, wherein the anchoring portion comprises a first spring coil assembly, and the embolization portion comprises a second spring coil assembly.

[0007] Optionally, the first spring coil assembly includes a first shaping wire and a first spring coil, the first shaping wire is a metal wire with resilience and is configured to have a first predetermined shape, the first spring coil is sleeved on the first shaping wire and enables the first spring coil assembly to form the first predetermined shape; and / or,

[0008] The second spring coil assembly includes a second shaping wire and a second spring coil. The second shaping wire is a metal wire with resilience and is configured to have a second predetermined shape. The second spring coil is sleeved on the second shaping wire and enables the second spring coil assembly to form the second predetermined shape.

[0009] Optionally, the occluder further comprises a developing element, wherein the developing element is arranged at a boundary area between the anchoring portion and the embolic portion; and / or the developing element is arranged on the anchoring portion and the embolic portion.

[0010] Optionally, an axial dimension of the first spring coil assembly is smaller than or equal to an axial dimension of the second spring coil assembly.

[0011] Optionally, the strength of the first spring coil assembly is greater than the strength of the second spring coil assembly.

[0012] Optionally, the first shaping wire and the second shaping wire are made of the same material, and the diameter of the first shaping wire is greater than the diameter of the second shaping wire so that the strength of the first spring coil assembly is greater than the strength of the second spring coil assembly.

[0013] Optionally, the diameter of the first shaping wire is 0.008 inch to 0.020 inch, and the diameter of the second shaping wire is 0.005 inch to 0.012 inch.

[0014] Optionally, the first predetermined shape is any one of a spiral line shape, a cone shape, a sphere shape or a hexahedron shape; and / or the second predetermined shape is any one of a spiral line shape, a cone shape, a sphere shape or a hexahedron shape.

[0015] Optionally, when the first predetermined shape is a cone, the cross-section of the cone gradually increases in a direction away from the embolic portion; and / or when the second predetermined shape is a cone, the cross-section of the cone gradually increases in a direction away from the anchoring portion.

[0016] Optionally, the embolic portion further comprises embolic promoting villi attached to the second spring coil assembly.

[0017] To achieve the above-mentioned purpose, the present invention also provides an occlusion system, comprising a stent and at least one occluder as described in any of the preceding items, wherein the embolic portion is used to pass through the pores on the stent and extend out of the stent, and the anchoring portion is used to be arranged in the inner cavity of the stent and connect the occluder to the stent.

[0018] Compared with the prior art, the occluder and occlusion system of the present invention have the following advantages:

[0019] The aforementioned blocking system includes an occluder and a stent, wherein the occluder includes an axially connected embolic portion and an anchoring portion, wherein the anchoring portion includes a first coil assembly, and the embolic portion includes a second coil assembly. When working, the embolic portion passes through the pores on the stent and extends to the outside of the stent and then extends into the rupture of the aortic dissection to block the rupture. The anchoring portion is arranged in the inner cavity of the stent, and the occluder is connected to the stent under the action of the first coil assembly. The occluder is positioned on the stent using the first coil assembly and maintained at a predetermined position, which can avoid misalignment and hooking other parts of the stent, and will not cause secondary damage to the blood vessel.

[0020] Further, the first spring coil assembly includes a first shaping wire and a first spring coil, the first shaping wire is a metal wire with resilience and is configured to have a predetermined shape, and the first spring coil is sleeved on the first shaping wire so that the anchoring portion forms the predetermined shape. The shape of the anchoring portion is maintained by the first shaping wire, so that the occluder can be effectively connected to the stent to avoid displacement. In addition, the embolization portion has a similar configuration, so that the second spring coil of the embolization portion is effectively coiled at the breach to effectively block the breach. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to better understand the present invention and do not constitute an improper limitation of the present invention.

[0022] Figure 1 It is a cross-sectional view of the blood vessels in the patient's body in the area where the aortic dissection occurred;

[0023] Figure 2 is a schematic structural diagram of an occluder provided according to an embodiment of the present invention;

[0024] Figure 3 is a schematic diagram of the structure of an occluder provided according to an embodiment of the present invention. The shape of the embolization part shown in the figure is similar to Figure 2 The shapes of the embolic parts of the occluders shown are different;

[0025] Figure 4 yes Figure 2The schematic diagram of the usage scenario of the occluder shown;

[0026] Figure 5 yes Figure 3 The schematic diagram of the usage scenario of the occluder shown;

[0027] Figure 6 3 is a schematic diagram of the structure of the embolization portion of the occluder provided in an embodiment of the present invention, in which the embolization portion is stretched into a straight line.

[0028] Figure 7 It is a schematic structural diagram of a first shaping wire of an occluder provided in an embodiment of the present invention;

[0029] Figure 8 1 is a schematic structural diagram of a first shaping wire of an occluder provided in an embodiment of the present invention, wherein the first shaping wire is in a first predetermined shape, and the first predetermined shape is a cone;

[0030] Fig. 9 is a schematic structural diagram of a first spring coil of an occluder provided in an embodiment of the present invention, in which the first spring coil is stretched into a straight line;

[0031] Fig.10 1 is a schematic structural diagram of a first spring coil assembly of an occluder provided in an embodiment of the present invention. In the figure, the first spring coil assembly is conical.

[0032] [Description of reference numerals is as follows]:

[0033] 10-true lumen, 20-false lumen, 30-rupture;

[0034] 100 - occluder, 110 - anchoring part, 111 - first shaping wire, 112 - first spring coil, 120 - embolization part, 121 - second shaping wire, 122 - second spring coil, 123 - embolization promoting villi, 130 - developing element;

[0035] 200-Stand. DETAILED DESCRIPTION

[0036] The following is an explanation of the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the present embodiment only illustrate the basic concept of the present invention in a schematic manner, and only the components related to the present invention are shown in the figure instead of being drawn according to the number, shape and size of the components in the actual implementation. The type, quantity and proportion of each component in the actual implementation can be a random change, and the component layout type may also be more complicated.

[0037] In addition, each embodiment of the following description has one or more technical features, but this does not mean that the user of the present invention must implement all the technical features in any embodiment at the same time, or can only implement part or all of the technical features in different embodiments separately. In other words, under the premise that implementation is possible, those skilled in the art can selectively implement part or all of the technical features in any embodiment according to the disclosure of the present invention and according to the design specifications or implementation requirements, or selectively implement a combination of part or all of the technical features in multiple embodiments, thereby increasing the flexibility of the implementation of the present invention.

[0038] As used in this specification, the singular forms "a", "an", and "the" include plural objects, and the plural form "plurality" includes more than two objects, unless the content clearly indicates otherwise. As used in this specification, the term "or" is generally used to include the meaning of "and / or", unless the content clearly indicates otherwise, and the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium, and it can be a connection between the internal parts of two elements or an interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0039] In order to make the purpose, advantages and features of the present invention more clear, the present invention is further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are all in very simplified form and in non-precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. The same or similar reference numerals in the drawings represent the same or similar components.

[0040] Figure 1 A cross-sectional view of a blood vessel in a patient's body showing an area where an aortic dissection has occurred, Figure 2 and Figure 3is a schematic structural diagram of an occluder 100 provided in an embodiment of the present invention. Figure 4 and Figure 5 Schematic diagram of a usage scenario of the occluder 100.

[0041] like Figure 1 As shown, when aortic dissection occurs in a patient, the aortic intima is torn, causing the media to separate and form a true lumen 10 and a false lumen 20 in the blood vessel, and the true lumen 10 and the false lumen 20 are connected through a rupture 30. The purpose of the embodiment of the present invention is to provide an occluder 100 (such as Figure 2 and Figure 3 The occluder 100 can be used to fill the false lumen 20 and block the rupture 30 in the treatment of aortic dissection to block blood flow from entering the false lumen 20 and promote thrombosis of the false lumen 20 (as shown in FIG. Figure 4 and Figure 5 shown).

[0042] Please refer to Figure 2 and Figure 3 The occluder 100 includes an anchoring portion 110 and an embolization portion 120 connected to each other. The anchoring portion 110 and the embolization portion 120 both include a coil assembly. Hereinafter, the coil assembly of the anchoring portion 110 is referred to as a first coil assembly, and the coil assembly of the embolization portion 120 is referred to as a second coil assembly. The occluder 100 can be used in conjunction with a stent 200 to treat aortic dissection. The stent 200 is a bare stent with pores formed thereon. Please refer to Figure 4 and Figure 5When working, the stent 200 is implanted in the true lumen 10 of the aorta, and the embolic part 120 of the occluder 100 passes through the pores on the stent 200 and extends out of the stent 200, and then extends into the false lumen 20 from the breach 30 and blocks the breach 30. The anchoring part 110 is arranged in the inner lumen of the stent 200, and the occluder 100 is connected to the stent 200 under the action of the first coil assembly. In this embodiment, the stent 200 is first delivered and released in the true lumen 10 of the aorta, and then the occluder 100 is delivered and released. The two are delivered separately, which reduces the delivery resistance and is easy to pass through the blood vessel. In addition, the occluder 100 is anchored by the first coil assembly, which can avoid its dislocation, improve the positioning accuracy, and also avoid damage to the blood vessel wall. In the embodiment of the present invention, in order to keep the anchoring part 110 in the inner lumen of the stent 200, the cross-sectional area of ​​at least a part of the first coil assembly can be larger than the area of ​​the pores. In addition, the connection direction between the embolic portion 110 and the anchoring portion 120 (i.e., the direction from the embolic portion 110 to the anchoring portion 120 , or the direction from the anchoring portion 120 to the embolic portion 110 ) is defined herein as the axial direction of the occluder 100 .

[0043] Preferably, the first spring coil assembly includes a first shaping wire 111 and a first spring coil 112, the first shaping wire 111 is a metal wire with resilience and is configured to have a first predetermined shape, the first spring coil 112 is sleeved on the first shaping wire and forms the first spring coil assembly into the first predetermined shape. Similarly, the second spring coil assembly may have a configuration similar to that of the first spring coil assembly. Specifically, the second spring coil assembly includes a second shaping wire 121 and a second spring coil 122, the second shaping wire 121 is a metal wire with resilience and is configured to have a second predetermined shape, the second spring coil 122 is sleeved on the second shaping wire 121 and forms the second spring coil assembly into the second predetermined shape. In the process of delivering the occluder 100 into the blood vessel, the first spring coil assembly and the second spring coil assembly are usually stretched into a straight line shape, and when the occluder 100 is released in the blood vessel, the first spring coil assembly is restored to the first predetermined shape under the action of the resilience of the first shaping wire 111, and the second spring coil assembly is restored to the second predetermined shape under the action of the resilience of the second shaping wire 121. That is to say, in the embodiment of the present invention, the shape of the first spring coil assembly is maintained by the first shaping wire 111, and the occluder 100 is effectively connected to the stent 200 to avoid displacement. The shape of the second spring coil assembly is also maintained by the second shaping wire 121, so that the second spring coil assembly is coiled at the breach 30 to effectively block the breach 30 and promote false lumen thrombosis. The specific shapes and molding methods of the first spring coil assembly and the second spring coil assembly will be introduced later.

[0044] The anchoring portion 110 is used to be arranged in the inner cavity of the stent 200, that is, the anchoring portion 110 is maintained in the true cavity 10 of the aorta. In this case, the size of the first coil assembly should be reduced as much as possible to reduce the possibility of thrombosis as much as possible, while ensuring that the occluder 100 can be effectively connected to the stent 200 (that is, the first coil assembly cannot pass through the pores on the stent 200). Usually, the axial size of the second coil assembly is greater than or equal to the axial size of the first coil assembly, which is conducive to thrombosis of the false cavity 20.

[0045] Please continue to refer to Figure 2 and Figure 3The embolic portion 120 also includes embolic promotion villi 123, which are attached to the second spring coil assembly to increase the filling area of ​​the occluder 100 and promote thrombosis of the false lumen 20. The material of the embolic promotion villi 123 can be at least one of polymer materials such as polyethylene terephthalate (PET), polyamide (PA), polyethylene (PE), polypropylene (PP), polyurethane (PU) or polylactic acid (PLA). These polymer materials are made into 300-700D fully drawn yarn (FDY) or drawn deformed yarn (DTY), and then wrapped around the second shaping yarn 121 for two to three turns, and are clamped and positioned by two adjacent turns of the second spring coil 122 to form the embolic promotion villi 123 (i.e. Figure 6 On the plugging portion 120, the embolization-promoting hairs 123 are arranged at intervals along the axial direction of the second shaping wire 121, and the axial spacing between two adjacent embolization-promoting hairs 123 is 5mm-10mm. In addition, the length of each embolization-promoting hair 123 (the length of the embolization-promoting hair 123 from the connection point on the first shaping wire 111 to the free end of the embolization-promoting hair 123) is 15mm-25mm.

[0046] Furthermore, the strength of the first spring coil assembly is greater than the strength of the second spring coil assembly, so that the anchoring portion 110 can provide sufficient anchoring performance. In an embodiment that can achieve this purpose, the first shaping wire 111 and the second shaping wire 121 are made of the same material, and the diameter of the first shaping wire 111 is greater than the diameter of the second shaping wire 121. Specifically, the diameter of the first shaping wire 111 can be 0.008 inch to 0.020 inch, and the diameter of the second shaping wire is 0.005 inch to 0.012 inch.

[0047] Please continue to refer to Figure 2 and Figure 3, the occluder 100 further includes a developing element 130, which is used to locate the embolic portion 120 and the anchoring portion 110 of the occluder 100 in the body. In some embodiments, the number of the developing element 130 may be at least one, and it is arranged at the boundary area between the embolic portion 120 and the anchoring portion 110, so that when the developing element 130 is located at the breach 30, it can be determined that the embolic portion 120 enters the false cavity 20, while the anchoring portion 110 remains in the inner cavity of the stent 200. It should be known that the boundary area may be the boundary line between the embolic portion 120 and the anchoring portion 110, or it may have a certain length. In other implementations, the number of the developing elements 130 is at least two, and at least two of the developing elements 130 are arranged on the embolic portion 120 and the anchoring portion 110, respectively. Of course, when there are three or more developing elements 130 , they can be respectively disposed at the anchoring portion 110 , the embolization portion 120 , and the boundary between the anchoring portion 110 and the embolization portion 120 .

[0048] Next, the specific shapes and manufacturing process of the first spring coil assembly and the second spring coil assembly are introduced. It is understandable that the first shaping wire 111 and the second shaping wire 121 can be formed separately and then connected together by welding, or they can be directly formed as one piece; similarly, the first spring coil 112 and the second spring coil 121 can be formed separately or directly formed as one piece, and the embodiment of the present invention does not limit this.

[0049] Please refer to Figure 7 The first shaping wire 111 can be made of shape memory alloys such as nickel-titanium alloy, copper-nickel alloy, copper-zinc alloy, cobalt-chromium alloy or stainless steel alloy. The first shaping wire 111 is coiled to be in the first predetermined shape, and is heat-treated so that the first shaping wire 111 has the first predetermined shape in a natural state. When the first shaping wire 111 is subjected to an external force, the shape of the first shaping wire 111 can be changed (for example, stretched straight), but when the external force is removed, the first shaping wire 111 can return to the first predetermined shape.

[0050] Preferably, the first shaping wire 111 is wound into a continuous and smooth curved structure, so that when the first spring coil assembly is finally formed, the first spring coil assembly has no sharp corners, thereby avoiding scratches on the blood vessel and causing secondary damage when implanted into the blood vessel. The specific shape of the curved structure is determined according to the first predetermined shape. In the embodiment of the present invention, the first predetermined shape can be a cone (such as Figure 8), spiral, spherical, hexahedral or any other suitable shape. It should be understood that when the first predetermined shape is a cone, the cross section of the cone gradually increases in the direction away from the plugging portion 120. In addition, the cone, spherical, and hexahedral shapes described herein include cones, spheres, and hexahedral shapes in a geometric sense, and also include situations in which they are generally cones, spheres, and hexahedral shapes.

[0051] The first spring coil 112 is formed by spirally winding a metal wire along a core axis to form a spring structure, and then heating and shaping the two ends of the metal wire (such as Fig. 9 The first spring coil 112 can be made of nickel-titanium wire, platinum-tungsten wire, stainless steel wire, etc.

[0052] Then, an external force is applied to the first shaping wire 111, and the first shaping wire 111 in the first predetermined shape is stretched straight, and then the first spring coil 112 is mounted on the first shaping wire 111. After the external force is removed, the first shaping wire 111 returns to the first predetermined shape under the action of its own resilience, thereby obtaining the first spring coil assembly having the first predetermined shape (when the first predetermined shape is a cone, the structure of the first spring coil assembly is as follows: Fig.10 Preferably, both ends of the first spring coil 112 are also connected to the first shaping wire 111 respectively, so as to prevent the first spring coil 112 from being untwisted during the release process of the occluder 100.

[0053] The above is introduced by taking the specific shape and manufacturing process of the first spring coil assembly as an example, but those skilled in the art can modify it to adapt it to the specific shape and manufacturing process of the second spring coil assembly. That is to say, the material of the second shaping wire 121 can be the same as the material of the first shaping wire 111, and the second predetermined shape can also be a spiral, a cone, a sphere, a hexahedron or any other suitable shape. After determining the second predetermined shape, the second shaping wire 121 is coiled into the second predetermined shape, and then the second spring coil 122 is sleeved on the stretched second shaping wire 121. When the second shaping wire 121 returns to the second predetermined shape, the second spring coil assembly in the second predetermined shape is obtained. Similarly, when the second predetermined shape is a cone, the cross section of the cone gradually increases in the direction away from the anchoring portion 110.

[0054] In addition, in the case where the first shaping wire 111 and the second shaping wire 121 are integrally formed, and the first spring coil 112 and the second spring coil 122 are integrally formed, a part of the integral shaping wire (including the first shaping wire 111 and the second shaping wire 121) is coiled into the first predetermined shape, and the other part is coiled into the second predetermined shape, and the shaping wire is straightened as a whole, and then the integral spring coil (including the first spring coil 112 and the second spring coil 122) is put on the shaping wire, and after the force applied to the shaping wire is cancelled to restore the shaping wire to its initial shape, the first spring coil assembly and the second spring coil assembly are obtained at the same time.

[0055] Please refer back to Figure 4 and Figure 5 The embodiment of the present invention further provides a blocking system, including the aforementioned occluder 100 and stent 200, wherein the stent 200 is generally a bare metal stent having pores thereon, and the embolic portion 120 of the occluder 100 is used to pass through the pores and extend out of the stent 200, thereby extending into the false lumen 20 from the rupture 30 of the aortic dissection and blocking the rupture 30, while the anchoring portion 110 is arranged in the inner cavity of the stent 200, and the occluder 100 is connected to the stent 200 to prevent the occluder 100 from shifting and affecting the blocking effect.

[0056] When treating aortic dissection, the stent 200 is first delivered and released in the true lumen 10 of the aorta. Then, the occluder 100 is implanted into a blood vessel using an introduction device. During the delivery of the occluder 10 by the introduction device, both the first coil assembly and the second coil assembly are stretched straight. When the distal end of the introduction device passes through the pores of the stent 200 and the breach 30 of the aortic dissection and enters the false lumen 20, the embolization part 120 is determined to have entered the false lumen 20 according to the display of the developing element 130, and the anchoring part 110 is maintained in the inner lumen of the stent 200, and the occluder 200 can be released. After the release is completed, the embolization part 120 is maintained in the false lumen 20, and the second coil assembly is coiled at the breach 30 to block the breach, and the first coil assembly of the anchoring part 110 is coiled and blocked by the stent edge of the pore edge of the stent 200 and maintained in the inner lumen of the stent 200.

[0057] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An occluder for aortic dissection, characterized in that: It comprises an axially connected anchoring portion and an embolization portion, wherein the anchoring portion comprises a first spring coil assembly, wherein the first spring coil assembly comprises a first shaping wire and a first spring coil, wherein the first shaping wire is a metal wire with resilience and is configured to have a first predetermined shape, and the first spring coil is sleeved on the first shaping wire and forms the first spring coil assembly into the first predetermined shape; and the embolization portion comprises a second spring coil assembly, wherein the second spring coil assembly has a three-dimensional second predetermined shape in a natural state.

2. The occluder according to claim 1, characterized in that: The second spring coil assembly includes a second shaping wire and a second spring coil. The second shaping wire is a metal wire with resilience and is configured to have a second predetermined shape. The second spring coil is sleeved on the second shaping wire and enables the second spring coil assembly to form the second predetermined shape.

3. The occluder according to claim 1 or 2, characterized in that: The occluder further comprises a developing element, which is arranged at a boundary area between the anchoring portion and the embolic portion; and / or, the developing element is arranged on the anchoring portion and the embolic portion.

4. The occluder according to claim 1 or 2, characterized in that: The axial dimension of the first spring coil assembly is smaller than or equal to the axial dimension of the second spring coil assembly.

5. The occluder according to claim 2, characterized in that: The strength of the first spring coil assembly is greater than the strength of the second spring coil assembly.

6. The occluder according to claim 5, characterized in that: The first shaping wire and the second shaping wire are made of the same material, and the diameter of the first shaping wire is greater than the diameter of the second shaping wire so that the strength of the first spring coil assembly is greater than the strength of the second spring coil assembly.

7. The occluder according to claim 6, characterized in that: The diameter of the first shaping wire is 0.008 inch to 0.020 inch, and the diameter of the second shaping wire is 0.005 inch to 0.012 inch.

8. The occluder according to claim 2, characterized in that: The first predetermined shape is any one of a spiral line shape, a cone shape, a sphere shape or a hexahedron shape; and / or the second predetermined shape is any one of a spiral line shape, a cone shape, a sphere shape or a hexahedron shape.

9. The occluder according to claim 8, characterized in that: When the first predetermined shape is a cone, a cross section of the cone gradually increases in a direction away from the embolization portion; and / or when the second predetermined shape is a cone, a cross section of the cone gradually increases in a direction away from the anchoring portion.

10. The occluder according to claim 1, characterized in that: The embolic portion further comprises embolic promotion hairs which are attached to the second coil assembly.

11. A blocking system, characterized in that: It comprises a stent and at least one occluder as described in any one of claims 1 to 10, wherein the embolic portion is used to pass through the pores on the stent and extend out of the stent, and the anchoring portion is used to be arranged in the inner cavity of the stent and connect the occluder to the stent.

Images