Split type plugging device

Abstract

The utility model discloses a split type plugging device, and belongs to the technical field of medical instruments. The split type plugging device comprises a plugging piece, a covering piece and a connecting structure used for being connected with the plugging piece and the covering piece in a clamped mode. The connecting structure comprises a first connecting piece and a second connecting piece which are connected in a clamped mode, the first connecting piece or the second connecting piece is arranged at the near end of the plugging piece, and the second connecting piece or the first connecting piece is arranged at the far end of the covering piece. The plugging piece and the covering piece are connected in a clamping mode through the connecting structure, the convenience and rapidness of connection between the covering piece and the plugging piece are improved through clamping connection, and the situation that the covering piece is loosened relative to the plugging piece and even is separated from the plugging piece can be prevented through clamping connection; and the stability and the reliability of connection between the covering piece and the plugging piece are further improved.

Description

Technical Field

[0001] This utility model relates to a split-type occluder, belonging to the field of medical device technology. Background Technology

[0002] Thromboembolism caused by atrial fibrillation mainly originates from the detachment of thrombi forming in the left atrium. Previous studies have found that more than 90% of left atrial thrombi are located in the left atrial appendage. Techniques including left atrial appendage occlusion can isolate the left atrial appendage from the circulatory system, preventing the vast majority of thrombus formation and detachment-related thromboembolic events at their source. Currently, clinical experience based on CT reconstruction or atrial appendage angiography shows no consistent left atrial appendage anatomical morphology, indicating significant individual differences in the anatomical structure of the left atrial appendage. To effectively accommodate more anatomical forms of the left atrial appendage and provide better occlusion results for more patients, split-type left atrial appendage occluders have emerged in current technology.

[0003] For example, Chinese patent document CN220175160U discloses a split-type left atrial appendage occluder. This split-type left atrial appendage occluder adopts a detachable segmented design, which can give the operator more options and ensure the occlusion effect of the occluder on the left atrial appendage.

[0004] However, the split connection of the aforementioned split-type left atrial appendage occluder uses an internal and external threaded connection structure. Under the influence of external forces, the internal and external threaded connection may rotate relative to each other, causing the split connection to loosen or even separate. Therefore, the connection stability and reliability of the split connection of the split-type occluder need to be further improved. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a split-type sealing device.

[0006] This utility model is achieved through the following technical solution:

[0007] A split-type occluder includes an occluder, a cover, and a connecting structure for snapping the occluder and the cover together.

[0008] The connection structure includes a first connector and a second connector that snap together. The sealing member is provided with the first connector or the second connector at its proximal end, and the covering member is provided with the second connector or the first connector at its distal end.

[0009] The first connector has an internal hollow structure, and a first limiting element is provided on the inner wall of the first connector; the second connector is provided with a second limiting element, and the second connector passes through the first connector, so that the first limiting element and the second limiting element cooperate with each other to realize the snap-fit ​​connection between the first connector and the second connector.

[0010] The first limiting element includes a limiting spring, one end of which is connected to the first connecting member near the second connecting member, and the other end is inclined toward the central axis of the first connecting member. The second limiting element includes a limiting groove; or, the first limiting element includes a limiting groove, the second limiting element includes a limiting spring, one end of which is connected to the second connecting member near the first connecting member, and the other end is inclined away from the central axis of the second connecting member.

[0011] The limiting groove is provided around the second connector or around the first connector to allow the first connector and the second connector to rotate relative to each other.

[0012] The number of limiting spring pieces is one or more, and the multiple limiting spring pieces are evenly spaced along the circumference of the first connector or along the circumference of the second connector.

[0013] The second connector has a guide at one end that passes through the first connector. The guide is conical or frustum-shaped, with its small end facing the first connector and its large end facing away from the first connector.

[0014] The cover has a disc-shaped structure, and the peripheral edge of the cover has a bend that bends away from the sealing element.

[0015] The cover has an elliptical disc-shaped structure and includes a first mesh and a first gathering member, with the proximal end of the first mesh being gathered in the first gathering member.

[0016] The beneficial effects of this utility model are as follows:

[0017] 1. The sealing component and the cover component are connected by a snap-fit ​​structure. The snap-fit ​​connection improves the convenience and speed of connecting the cover component and the sealing component. It also prevents the cover component from becoming loose relative to the sealing component or even separating from each other, further improving the stability and reliability of the connection between the cover component and the sealing component.

[0018] 2. A split-type occluder is adopted, with the occlusion component and the cover component set as two independent parts. Medical staff can select appropriate occlusion components and cover components according to the anatomical structure of the left atrial appendage, so as to form a more flexible and comprehensive implantable device specification, thereby addressing different occlusion strategies.

[0019] 3. The occlusion element and the covering element are connected by a connecting structure that cleverly utilizes the structure of a limiting spring. When medical staff assemble the occlusion element and the covering element, the spring is compressed under force, which does not affect the process of the second connecting element entering the first connecting element. Until the limiting spring is locked in the limiting groove, the limiting spring rebounds, and the free end of the limiting spring prevents the limiting spring from leaving the limiting groove, thereby limiting the separation of the first and second connecting elements and eliminating the risk of connection failure between the occlusion element and the covering element. This not only makes the connection between the occlusion element and the covering element more convenient but also improves the connection strength, which is conducive to improving the quality and safety of the surgery.

[0020] 4. The limiting groove is formed by surrounding the second or first connector, allowing the first and second connectors to rotate relative to each other when the limiting spring is placed in the limiting groove. This allows medical staff to adjust the relative position of the cover and the patient's left atrial appendage, improving the blocking effect of the cover on the left atrial appendage. Conversely, the limiting spring has strong deformation capability, and a small amount of radial relative movement can also occur between the first and second connectors after connection. This facilitates the adjustment of the relative radial distance between the occlusion device and the cover by medical staff, further improving the blocking effect of the cover on the left atrial appendage. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a treatment application scenario in which this utility model is applied;

[0022] Figure 2 These are schematic diagrams of the structures of several common left atrial appendages provided in the embodiments of this utility model;

[0023] Figure 3 This is a three-dimensional structural disassembly diagram of the split-type plug provided in one embodiment of the present invention;

[0024] Figure 4 This is a side view of a split-type plugging device provided in one embodiment of the present invention;

[0025] Figure 5 yes Figure 4 The cross-sectional view shown;

[0026] Figure 6 This is a three-dimensional structural disassembly diagram of the connection structure provided in one embodiment of the present utility model;

[0027] Figure 7This is a cross-sectional view of the connection structure provided in one embodiment of the present utility model;

[0028] Figure 8 This is a cross-sectional view of the connection structure provided in another embodiment of the present invention;

[0029] Figure 9 This is a three-dimensional structural disassembly diagram of the split-type plug provided in another embodiment of the present invention;

[0030] Figure 10 This is a structural view of the split-type occluder provided in another embodiment of the present invention, viewed from the proximal side.

[0031] Explanation of icon numbers:

[0032] 100. Sealing component; 110. Second mesh body; 120. Second gathering component;

[0033] 200. Covering component; 210. First mesh body; 212. Bending portion; 220. First gathering component;

[0034] 300. Connecting structure; 310. First connector; 311. Cutting line; 320. Second connector; 321. Converging space; 330. Limiting spring; 340. Limiting groove; 350. Guide; 351. Small end; 352. Large end;

[0035] 401. Aorta; 402. Aortic valve; 403. Left ventricle; 404. Left atrium; 405. Mitral valve; 406. Left atrial appendage; 407. Right ventricle; 408. Right atrium; 409. Tricuspid valve; 410. Atrial septum; 411. Superior vena cava; 412. Inferior vena cava. Detailed Implementation

[0036] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the specific implementation methods of this application will be described below with reference to the accompanying drawings. The accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without creative effort. Adjustments and improvements made without departing from the concept of this application are all within the protection scope of this application.

[0037] To keep the drawings concise, the figures in this application only schematically show the parts relevant to this application, and they do not represent the actual structure of the product. Furthermore, to make the drawings concise and easy to understand, some figures only schematically show parts of components with the same structure or function; in reality, there may be more or fewer components with the same structure or function.

[0038] In this application, unless otherwise expressly specified and limited, ordinal numbers, such as "first," "second," etc., are used only to distinguish and describe related objects, and should not be construed as indicating or implying the relative importance or order between related objects; furthermore, they do not represent the number of related objects. "And / or" is used to describe the relationship between related objects, which includes any relationship between the related objects; for example, "a and / or b" includes: "a alone," "b alone," or "a and b." The terms "installation" and "connection" should be interpreted broadly; for example, "installation" can be direct installation or installation via other components; "connection" can be direct connection or connection via other components. The term "relative arrangement" includes parallel relative or relative at a certain angle, the angle of which is not limited and is determined according to the number of objects in the relative arrangement.

[0039] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) are relative rather than absolute when describing the structure and movement of the various components, and are not intended to limit the direction of the product during actual use.

[0040] In the embodiments of this application, "proximal end" refers to the end of the associated object closer to the operator; "distal end" refers to the end of the associated object farther from the operator. "Proximal end" and "distal end" are the position or orientation of the associated object (e.g., a component of a medical device) relative to the operator (e.g., a doctor) from the perspective of the operator using the device (e.g., a medical device). For example, "proximal end" refers to the end closer to the doctor during normal operation of the medical device, while "distal end" refers to the end farther from the doctor during normal operation of the medical device, that is, the end that first enters the patient's body.

[0041] In recent years, with the frequent occurrence of stroke patients, people have paid increasing attention to the problem of atrial fibrillation. Atrial fibrillation, also known as atrial fibrillation, is a significant disease threatening public health. Approximately 5% of atrial fibrillation patients suffer a stroke each year; and about 20% of all stroke patients are related to atrial fibrillation. Furthermore, research has shown that more than 90% of thrombi in the left atrium originate from the left atrial appendage.

[0042] See Figure 1The heart is a hollow muscular organ with four chambers: the left atrium (404), left ventricle (403), right atrium (408), and right ventricle (407). Each chamber connects to a different blood vessel. The left ventricle (403) connects to the aorta (401), whose orifice is located anterosuperiorly to the right of the left atrioventricular orifice, with a crescent-shaped aortic valve (402) attached to its periphery. The left atrium (404) connects to the pulmonary veins, the right ventricle (407) connects to the pulmonary artery, and the right atrium (408) connects to the superior vena cava (411) and inferior vena cava (412). The left atrium (404) and right atrium (408) are separated by the atrial septum (410). The anterior portion of the left atrium (404) protruding anteroright is the left atrial appendage (406). The left ventricle (403) and right ventricle (407) are separated by the ventricular septum. The atria and ventricles are connected by atrioventricular valves (hereinafter referred to as valves). During ventricular diastole, the valves open, allowing blood to flow from the atria into the ventricles; during ventricular systole, the valves close, preventing blood from flowing back from the ventricles into the atria. The valve between the left atrium (404) and left ventricle (403) is the mitral valve (405), and the valve between the right atrium (408) and right ventricle (407) is the tricuspid valve (409).

[0043] Theoretically, by performing left atrial appendage occlusion, an interventional procedure is used to puncture the femoral vein and insert a split-type occluder into the landing area within the left atrial appendage 406. After the device is deployed to block the left atrial appendage 406, the thrombus formed within the left atrial appendage 406 can be prevented from dislodging and forming an embolism, thus reducing the chance of atrial fibrillation embolism by at least 90%.

[0044] Typically, the landing zone of a split-type occluder is closer to the adjoint area between the left atrium 404 and the left atrial appendage 406, which may be referred to as the orifice of the left atrial appendage 406. However, based on current clinical experience using CT reconstruction or atrial appendage angiography, no anatomically identical left atrial appendage 406 has been observed, including but not limited to those shown below. Figure 2 The anatomical morphology is shown. The landing area and the morphology of the left atrial appendage 406 are also different in different morphologies. Therefore, it is particularly important to develop customizable split-type occluders.

[0045] The following description is in conjunction with the accompanying drawings:

[0046] See Figures 3 to 5 This is a schematic diagram of a split-type occluder provided in an embodiment of this application. The split-type occluder includes an occluder 100, a cover 200, and a connecting structure 300 for snapping together the occluder 100 and the cover 200. The occluder 100 and the cover 200 are snapped together using the connecting structure 300. This snap-fit ​​connection improves the convenience and speed of connecting the cover 200 and the occluder 100, and also prevents the cover 200 from loosening relative to the occluder 100, or even separating from it, further improving the stability and reliability of the connection between the cover 200 and the occluder 100.

[0047] The connection structure 300 includes a first connector 310 and a second connector 320 that are snap-fitted together. The sealing member 100 has the first connector 310 or the second connector 320 at its proximal end, and the covering member 200 has the second connector 320 or the first connector 310 at its distal end. By snapping and disassembling the first connector 310 and the second connector 320, the sealing member 100 and the covering member 200 can be fixed or separated.

[0048] This embodiment sets the occlusion element 100 and the cover element 200 as two independent parts, and provides a connecting structure 300 that can snap the two parts together. This allows the occlusion element 100 to be used independently or in combination with the cover element 200. Thus, in actual use, medical personnel can choose to use the occlusion element 100 alone or select a suitable combination of the occlusion element 100 and the cover element 200 based on the anatomical structure of the left atrial appendage 406, forming a more flexible and comprehensive implantable device specification. This greatly increases the applicability of the split-type occluder, enabling it to cope with different occlusion strategies and providing high flexibility.

[0049] Specifically, in actual production, occlusion components 100 and cover components 200 with different axial (distal to proximal) dimensions and radial (perpendicular to the axial) dimensions can be produced. For the occlusion component 100 with a larger axial dimension, it can be used alone, allowing it to be fully or partially implanted into the left atrial appendage 406 to block blood flow between the left atrial appendage 406 and the left atrium 404. For the occlusion component 100 with a smaller axial dimension, it can be used in conjunction with the cover component 200, allowing the occlusion component 100 to be fully implanted into the left atrial appendage 406, with the cover component 200 covering the opening of the left atrial appendage to block blood flow between the left atrial appendage 406 and the left atrium 404.

[0050] Different sizes of occluder 100 and different sizes of cover 200 can be combined to form a variety of different combinations, thereby obtaining more specifications of split occluders. This has a wide range of applications and makes it easier for medical staff to obtain the most suitable split occluder based on the anatomical structure of the patient's left atrial appendage 406, resulting in better occlusion effect.

[0051] More importantly, if more left atrial appendage 406 morphologies emerge in the future, suitable occlusion components 100 and / or cover components 200 can be produced. These can be combined with the already produced cover components 200 and / or occlusion components 100 to form even more combinations, realizing the continuous development of customizable occluders and making them highly practical.

[0052] To further optimize the structure of the split-type occluder and facilitate the assembly of the occluder 100 and the cover 200, a quick-release snap-fit ​​structure is preferably used to connect the first connector 310 and the second connector 320. Specifically, the first connector 310 has an internal hollow structure, and a first limiting element is provided on its inner wall. The first limiting element can be either a snap-fit ​​or a slot. The second connector 320 is provided with a second limiting element, which can also be either a snap-fit ​​or a slot. The second connector 320 passes through the first connector 310 so that the first limiting element and the second limiting element cooperate with each other to achieve a snap-fit ​​connection between the first connector 310 and the second connector 320. When the second connector 320 passes through the first connector 310, the snap-fit ​​is engaged in the slot, thereby achieving a limiting engagement between the first limiting element and the second limiting element, and thus completing the snap-fit ​​connection between the first connector 310 and the second connector 320.

[0053] In a preferred embodiment, see Figure 3 and Figure 5 The quick-release structure can also employ a combination of a limiting spring 330 and a limiting groove 340. The limiting spring 330 has stronger deformation capability and is easier to assemble. For example, see... Figure 6 and Figure 7 The first limiting element includes a limiting spring 330. One end of the limiting spring 330 near the second connecting member 320 is connected to the first connecting member 310, and the other end is inclined towards the central axis of the first connecting member 310. The second limiting element includes a limiting groove 340. At this time, if medical personnel need to assemble the sealing member 100 and the covering member 200, they can directly insert one end of the second connecting member 320 into the second connecting member 320. During the insertion of the second connecting member 320, the end of the second connecting member 320 will push open the limiting spring 330, so that the free end of the limiting spring 330 (the end away from the first connecting member 310) is pressed against the inner wall of the first connecting member 310, so that the second connecting member 320 can pass through. When the limiting groove 340 on the second connector 320 moves to the position of the limiting spring 330, the limiting spring 330 rebounds and is directly locked in the limiting groove 340. The free end of the limiting spring 330 will form a limit with the edge of the limiting groove 340, thereby restricting the second connector 320 from disengaging from the first connector 310 and achieving a stable connection between the sealing member 100 and the covering member 200.

[0054] In actual production, see Figure 8Alternatively, the first limiting element may include a limiting groove 340, and the second limiting element may include a limiting spring 330. One end of the limiting spring 330 near the first connecting member 310 is connected to the second connecting member 320, and the other end is inclined away from the central axis of the second connecting member 320. In this way, when medical personnel need to assemble the sealing member 100 and the covering member 200, one end of the second connecting member 320 can be directly inserted into the second connecting member 320. During the insertion of the second connecting member 320, the limiting spring 330 on the second connecting member 320 will be pressed against the inner wall of the first connecting member 310 and fit against the outer wall of the second connecting member 320, making it convenient for the end of the second connecting member 320 to enter the interior of the first connecting member 310. When the limiting spring 330 on the second connector 320 moves to the limiting groove 340, the limiting spring 330 rebounds and is directly locked in the limiting groove 340. The free end of the limiting spring 330 (the end away from the first connector 310) will form a limit with the edge of the limiting groove 340, thereby restricting the second connector 320 from disengaging from the first connector 310. This can also achieve a stable connection between the sealing member 100 and the covering member 200. This is not a limitation and is within the protection scope of this application.

[0055] In the two embodiments described above, the number of limiting springs 330 is at least two. Compared with the case of limiting with a single limiting spring 330, the limiting effect of using two or more limiting springs 330 is better.

[0056] Further, see Figure 3 and Figure 8 The limiting groove 340 is arranged around the second connector 320 or the first connector 310 in a circumferential direction, allowing the first connector 310 and the second connector 320 to rotate relative to each other. In this way, medical personnel can adjust the relative position of the cover 200 and the patient's left atrial appendage by rotating the first connector 310 or the second connector 320, further improving the blocking effect of the cover 200 on the left atrial appendage.

[0057] The number of the limiting elastic pieces 330 is one or more, and the multiple limiting elastic pieces 330 are evenly spaced along the circumferential direction of the first connecting piece 310 or along the circumferential direction of the second connecting piece 320. Preferably, the number of the limiting elastic pieces 330 is three. In this embodiment, by arranging three limiting elastic pieces 330, three-point support can be formed for the second connecting piece 320 or the first connecting piece 310, so as to determine the position of the central axis of the second connecting piece 320 or the first connecting piece 310. In addition, since the limiting elastic pieces 330 are easy to deform, a small amount of relative radial movement can occur between the first connecting piece 310 and the second connecting piece 320. Medical staff can adjust the relative radial positions of the first connecting piece 310 and the second connecting piece 320, so as to adjust the relative radial distance between the plugging piece 100 and the covering piece 200, and further improve the blocking effect of the covering piece 200 on the left atrial appendage opening.

[0058] In a specific embodiment, referring to Figures 3 to 7 , a proximal end of the plugging piece 100 is provided with the first connecting piece 310, and the first limiting element on the first connecting piece 310 includes the limiting elastic piece 330; a distal end of the covering piece 200 is provided with the second connecting piece 320, and the second limiting element on the second connecting piece 320 includes the limiting groove 340.

[0059] Since the first connecting piece 310 has an internally hollow structure, in actual production, in addition to directly arranging the limiting elastic pieces 330 on the inner wall of the first connecting piece 310, a cutting line 311 in a "匚" shape can also be drawn on the outer side wall of the first connecting piece 310 according to needs. After cutting, a split part with a free end will be formed on the side wall of the first connecting piece 310. After bending the split part inward, the above-mentioned limiting elastic pieces 330 can be formed. Of course, if the limiting elastic pieces 330 are the second limiting elements on the second connecting piece 320, a similar processing method can also be used for production, which will not be elaborated here, and all are within the protection scope of this application.

[0060] One end of the second connecting piece 320 penetrating through the first connecting piece 310 is provided with a guiding piece 350. The guiding piece 350 is in a conical or frustum-shaped structure, and the small end of the guiding piece 350 is arranged towards the direction of the first connecting piece 310 (distal end), and the large end of the guiding piece 350 is arranged away from the direction of the first connecting piece 310 (proximal end). This is beneficial to guiding the end of the second connecting piece 320 to penetrate through the first connecting piece 310, and realizing the rapid positioning and connection between the plugging piece 100 and the covering piece 200. Especially when the first limiting element on the first connecting piece 310 adopts the limiting elastic piece 330, the guiding piece 350 is more likely to push open the limiting elastic pieces 330 inside the first connecting piece 310, so that the second connecting piece 320 can penetrate more smoothly, which is convenient for medical staff to assemble.

[0061] The cover 200 has a disc-shaped structure, and its peripheral edges have bends 212 that bend away from the sealing member 100. For practical use, see [reference needed]. Figures 3 to 5 , Figure 9 and Figure 10 The cover 200 used in conjunction with the sealing member 100 is preferably a disc-shaped structure with a certain thickness, such as a flat or arc shape, especially an elliptical disc-shaped structure, which can achieve a better blocking effect on the left atrial appendage. The peripheral edge of the cover 200 has a bend 212 that bends away from the sealing member 100.

[0062] In one specific embodiment, see Figure 3 and Figure 9 The covering 200 has an elliptical disc-shaped structure and includes a first mesh 210 and a first gathering member 220. The distal end of the first mesh 210 is gathered in a second connecting member 320, and the proximal end of the first mesh 210 is gathered in the first gathering member 220. The first mesh 210 is woven from multiple elastic metal wires. The proximal end of the first gathering member 220 can be used to connect to an external delivery catheter so that medical personnel can deliver the split-type occluder to the target location inside the body. At this time, the second connecting member 320 may have an internal hollow structure or have a gathering space 321 at its proximal end to accommodate the free braided wires at the distal end of the first mesh 210. Correspondingly, the occlusion member 100 includes a second mesh 110 and a second gathering member 120. The second mesh 110 is woven from multiple elastic metal wires, with its distal end gathered in the second gathering member 120 and its proximal end gathered in the first connecting member 310.

[0063] The second connector 320 and the first retractor 220 are eccentrically positioned and not on the same axis. See also Figure 9 and Figure 10 When the cover 200 has an elliptical disk-shaped structure, the second connector 320 and the first converging member 220 are eccentrically arranged and not coaxial. Specifically, the second connector 320 and the first converging member 220 are located at the two foci of the elliptical structure, respectively.

[0064] In use, the split-type occluder is implanted into the left atrial appendage 406 via the following steps: a delivery channel is established in the left atrial appendage 406 using a thin catheter via a blood vessel; the size of the left atrial appendage 406 is measured by angiography, and the appropriate size of the split-type occluder is assessed; the split-type occluder is elongated using a pusher device to deform it into a thin delivery shape, and then inserted into the thin catheter, where it is delivered to the implantation site within the left atrial appendage 406; the split-type occluder is pushed out of the thin catheter using the pusher device, and it returns to its preset shape at the implantation site to achieve occlusion of the left atrial appendage 406; the pusher device is separated from the split-type occluder and withdrawn from the body; the thin catheter is withdrawn from the body.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0066] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this application. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A split-type sealing device, characterized in that: It includes a sealing element, a covering element, and a connecting structure for snapping the sealing element and the covering element together; The connection structure includes a first connector and a second connector that snap together; the sealing member is provided with the first connector or the second connector at its proximal end, and the covering member is provided with the second connector or the first connector at its distal end. The first connector has an internal hollow structure, and a first limiting element is provided on the inner wall of the first connector; the second connector is provided with a second limiting element, and the second connector passes through the first connector, so that the first limiting element and the second limiting element cooperate with each other to realize the snap-fit ​​connection between the first connector and the second connector; The first limiting element includes a limiting spring, one end of which is connected to the first connecting member near the second connecting member, and the other end is inclined toward the central axis of the first connecting member. The second limiting element includes a limiting groove; or, the first limiting element includes a limiting groove, the second limiting element includes a limiting spring, one end of which is connected to the second connecting member near the first connecting member, and the other end is inclined away from the central axis of the second connecting member.

2. The split-type plugging device as described in claim 1, characterized in that: The limiting groove is provided around the second connector or around the first connector to allow the first connector and the second connector to rotate relative to each other.

3. The split-type plugging device as described in claim 1, characterized in that: The number of limiting spring pieces is one or more, and the multiple limiting spring pieces are evenly spaced along the circumference of the first connector or along the circumference of the second connector.

4. The split-type plugging device as described in claim 1, characterized in that: The second connector has a guide at one end that passes through the first connector. The guide is conical or frustum-shaped, with its small end facing the first connector and its large end facing away from the first connector.

5. The split-type plugging device as described in claim 1, characterized in that: The cover has a disc-shaped structure, and the peripheral edge of the cover has a bend that bends away from the sealing element.

6. The split-type plugging device as described in claim 5, characterized in that: The cover has an elliptical disc-shaped structure and includes a first mesh and a first gathering member, with the proximal end of the first mesh being gathered in the first gathering member.

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