A magnetic plug protection device and plug system

Abstract

This invention discloses a magnetic embolism protection device and system, belonging to the field of medical device technology. It includes a catheter and an umbrella-shaped filter assembly disposed on the distal outer wall of the catheter. A permanent magnet is disposed within the catheter to cooperate in opening and closing the filter assembly. The catheter has a first cavity, a second cavity, and a guidewire cavity along its length. The first cavity is located near the inner wall of the catheter, while the second and guidewire cavities are located side-by-side within the catheter. The distal ends of the first and second cavities are interconnected through a connecting hole. The permanent magnet is placed in the middle of the first cavity, and a first hole is located at the proximal end of the catheter, communicating with the first cavity. By pressurizing the first cavity, the permanent magnet is displaced, further causing the unfolding and opening rods to expand and contract magnetically. The size of the umbrella opening can be controlled to adapt to blood vessels of different inner diameters. It is highly adaptable, structurally stable, and easy to control, effectively intercepting free thrombi, reducing the probability of thromboembolism, and improving the success rate of surgery.

Description

Technical Field

[0001] This invention belongs to the field of medical devices, specifically relating to a magnetic embolization protection device and embolization system. Background Technology

[0002] Embolism is the phenomenon where insoluble, abnormal substances appearing in the circulating blood travel with the bloodstream to distant locations and obstruct blood vessels. Thrombosis occurs due to certain predisposing factors, triggering an intrinsic or extrinsic coagulation system. Formed elements in the blood, such as platelets, abnormally aggregate in the circulating blood to form blood clots. These clots may form on the inner wall of the heart or blood vessels, causing vascular obstruction or embolism, leading to serious bodily damage. Thrombosis is prevalent throughout the cardiovascular system, affecting tissues and organs throughout the body. After thrombosis, the resulting vascular occlusion and obstructed blood flow cause ischemia, hypoxia, and even necrosis of the tissues supplied by the affected vessels, resulting in symptoms of corresponding tissue and organ dysfunction.

[0003] In clinical practice, anticoagulants and thrombolytic drugs are used for treatment, but the therapeutic effect is extremely limited. The larger the diameter of the thrombus-occluded blood vessel, the worse the treatment effect, with low recanalization rates and long recanalization times. Furthermore, some patients are not suitable for thrombolytic therapy. When using interventional methods to treat vascular embolism, the narrowed area of ​​the blood vessel is often blocked by thrombi or tissue detachment, causing vascular necrosis and increasing surgical risks. To address this problem, an embolization protection device has been proposed. This device intercepts thrombi or tissue distally with a mesh without affecting normal blood flow and removes them from the body, ensuring the normal progress of the procedure and improving the success rate. However, existing embolization protection devices mostly rely on catheter movement to open and close the mesh structure, and the mesh structure is often composed of shape memory alloy filaments. The movement of the catheter, which in turn drives the opening of the mesh structure, requires high welding technology and multiple layers of tubing, resulting in a complex structure. The shape memory alloy filament structure is also easily deformed by blood flow.

[0004] Existing technologies disclose several patents for embolism protection devices. Among them, invention patent CN113425374A discloses a disposable embolism protection umbrella, including a transport guide wire, a filter screen, and a delivery and retrieval sheath. The transport guide wire includes a distal guide wire and a proximal guide wire… The delivery and retrieval sheath includes a delivery sheath and a retrieval sheath. The delivery sheath is used to house the transport guide wire and the filter screen, and the delivery sheath and retrieval sheath are connected by a connecting component. The side wall of the delivery sheath also has a first opening groove for the transport guide wire and the filter screen to pass through. Although this solves the problem of the embolism protection umbrella's rigid delivery structure and insufficient overall flexibility, it still suffers from the high welding requirements and production difficulties of the mesh structure, and the fact that the filamentous wire structure is easily deformed by blood flow, affecting its effectiveness.

[0005] In view of this, the inventors conducted in-depth research to address this need, which led to this case. Summary of the Invention

[0006] To overcome the problems in existing technologies, such as the high cost and difficulty in production due to the high welding technology requirements of the grid structure, and the fact that the structure of the filamentous wire is easily deformed by blood flow, thus affecting the effectiveness, this invention provides a magnetic embolization protection device and embolization system.

[0007] The first aspect of the present invention provides a magnetic embolization protection device, including a catheter and an umbrella-shaped filter assembly disposed on the outer wall of the distal end of the catheter. A permanent magnet is disposed inside the catheter to cooperate in opening and closing the filter assembly. The catheter has a first cavity, a second cavity, and a guidewire cavity along its length. The first cavity is located near the inner wall of the catheter. The second cavity and the guidewire cavity are located side by side inside the catheter. The distal ends of the first cavity and the second cavity are interconnected by a connecting hole. The permanent magnet is placed in the middle of the first cavity. A first hole is provided at the proximal end of the catheter, and the first hole is connected to the first cavity.

[0008] This device employs a permanent magnet installed inside the catheter, which works in conjunction with an umbrella-shaped filter assembly connected to the outside of the catheter. By pressurizing the first lumen, the permanent magnet is displaced, further causing the filter assembly to expand and contract through magnetic force. The size of the umbrella opening can be controlled to adapt to blood vessels of different inner diameters, making it highly adaptable. The embolization protection device has a stable and easy-to-control structure, effectively intercepting free thrombi, reducing the probability of thromboembolism, and improving the success rate of surgery. A single three-lumen tube with a permanent magnet can complete the opening and contraction of the device, reducing the manufacturing difficulty of the entire device. The use of a rod structure reduces the impact of blood flow on the umbrella frame deformation, improving stability.

[0009] Furthermore, the filter assembly includes an umbrella frame, a fixed ring, and a movable collar. The fixed ring is fixedly connected to the guide tube and to the far end of the umbrella frame. The movable collar is slidably sleeved on the outer wall of the guide tube and is fixedly connected to the near end of the umbrella frame. The movable collar and the permanent magnet cause the umbrella frame to open and close through magnetic force.

[0010] Through the above technical solution, the connection between the fixed ring and the movable collar and the umbrella frame allows the filter assembly to be set coaxially with the catheter, thereby improving the wall adhesion of the circumferential catheter of the umbrella frame. This can prevent thrombi from escaping from the gap between the embolization protection device and the blood vessel wall in multiple directions, resulting in better capture effect.

[0011] Furthermore, the umbrella frame includes a plurality of unfolding rods and a plurality of spreading rods. One end of each of the unfolding rods is rotatably connected to the fixed ring via a first connecting ring, and the unfolding rods are equidistantly arranged on the fixed ring. One end of each of the spreading rods is rotatably connected to the movable collar via a second connecting ring, and the spreading rods are equidistantly arranged on the movable collar. The other end of each spreading rod is rotatably connected to the middle part of the unfolding rod via a limiting shaft.

[0012] The above technical solution involves setting up an unfolding rod and a spreading rod to connect with a fixed ring and a movable collar. The unfolding rod and the spreading rod provide higher rigidity to the filter assembly, enabling the filter assembly to better capture thrombi in blood vessels during use.

[0013] Furthermore, the free end of the spreading rod is provided with a first connecting hole, the middle part of the unfolding rod is provided with a connecting groove, the connecting groove is matched with the spreading rod, and the two sides of the connecting groove are provided with second connecting holes, the first connecting hole and the second connecting hole are matched with the limiting shaft.

[0014] The above technical solution provides a connecting groove in the middle of the unfolding rod, which ensures the rotational connection between the expansion rod and the unfolding rod. It also allows the moving collar to transmit force to the unfolding rod through the expansion rod when it is subjected to magnetic force, enabling the unfolding rod to complete the unfolding and retracting actions.

[0015] Furthermore, a compression mesh surface is provided on the outer side of the unfolding rod away from the moving collar, the compression mesh surface is fixedly connected to the unfolding rod, and a plurality of leakage holes are opened on the compression mesh surface between the unfolding rods.

[0016] By using the above technical solution, a compression mesh is set on the outside of the unfolding rod, which can prevent thrombi from escaping in the gap between the unfolding rod and the expanding rod during use, resulting in better capture effect. At the same time, by opening leakage holes on the compression mesh, the flow of blood is not blocked during the thrombus removal process, thus avoiding affecting the operation.

[0017] Furthermore, the unfolding rod has several drug outlet holes on its two sides adjacent to the compression mesh surface. The drug outlet holes contain drugs for thrombolysis, and the openings of the drug outlet holes are covered with an aqueous film.

[0018] Through the above technical solution, drug outlet holes for filling thrombolytic drugs are provided on both sides of the unfolding rod perpendicular to the compression mesh surface. The thrombus contained by the compression mesh surface is dissolved by the released thrombolytic drugs. Since the compression mesh surface is provided on the outside of the unfolding rod when entering the blood vessel, the drug can be prevented from being released in advance, so that the drug is released again at a specific position to improve the utilization rate and draw out the thrombus to clear the blood.

[0019] Furthermore, the two ends of the unfolding rod opposite to the connecting groove have medicine storage spaces inside, and the medicine outlet is connected to the medicine storage space.

[0020] Through the above technical solution, drug storage spaces are provided on both sides of the unfolding rod and the connecting groove at a certain distance and are connected to the drug outlet. The setting of the drug storage space ensures that there is enough space in the device to place the thrombolytic agent, and avoids insufficient filling of the drug affecting the thrombolytic effect in the case that the drug is released in advance due to the dissolution of the water-based coating.

[0021] Furthermore, the permanent magnet is clearance-fitted with the inner wall of the conduit, and the length of the permanent magnet is greater than the inner diameter of the conduit.

[0022] Furthermore, the proximal end and distal end of the permanent magnet are respectively connected to a first traction wire and a second traction wire. The proximal end of the first traction wire extends out of the first hole along the first cavity, and the proximal end of the second traction wire extends out of the second cavity along the second cavity.

[0023] By using the above technical solution, setting the length of the permanent magnet to be larger than the inner diameter of the conduit can ensure that the permanent magnet can move back and forth in the first cavity, while also ensuring that there is a suitable pushing or pulling force on the moving collar.

[0024] A second aspect of the present invention provides a magnetic embolization system, comprising an embolization protection device and a delivery conduit as described above, wherein the delivery conduit can house and deliver the embolization protection device.

[0025] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0026] (1) A permanent magnet is installed inside the catheter to cooperate with the umbrella frame connected to the outside of the catheter. By pressurizing the first cavity, the permanent magnet is displaced, and the unfolding rod and the opening rod are further pushed by magnetic force to achieve unfolding. By controlling the size of the umbrella frame opening, it can adapt to blood vessels with different inner diameters, making it highly adaptable. The embolization protection device has a stable structure and is easy to control. It can effectively intercept free thrombi, reduce the probability of thromboembolism, and improve the success rate of surgery. A three-lumen tube with a permanent magnet can complete the opening and closing action of the device, reducing the manufacturing difficulty of the entire device. The use of a rod structure reduces the impact of blood flow on the deformation of the umbrella frame and improves stability.

[0027] (2) By setting a compression mesh on the outside of the unfolding rod, the thrombus is prevented from escaping in the gap between the unfolding rod and the spreading rod during use, resulting in a better capture effect. At the same time, by setting a leakage hole on the compression mesh, the flow of blood is blocked during the thrombus removal process, which would cause tissue ischemia and damage, thus improving the safety of the operation.

[0028] (3) A drug outlet is set on the expansion rod and a drug storage space for placing thrombolytic agents is opened in it. The drug outlet is sealed with a water-soluble film. After the expansion rod is opened, the film dissolves the thrombolytic agents and they are integrated into the blood in the blood flow. This can dissolve the captured thrombi, clean the thrombi in the blood vessels more completely, and shorten the cleaning time. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a magnetic embolism protection device according to the present invention;

[0031] Figure 2 This is a schematic diagram of the magnetic embolism protection device of the present invention from another angle;

[0032] Figure 3 This is a cross-sectional schematic diagram of the conduit at the connecting hole in a magnetic embolization protection device of the present invention;

[0033] Figure 4 This is a schematic diagram of the umbrella frame in a magnetic embolism protection device of the present invention;

[0034] Figure 5 This is a schematic diagram of the unfolding rod in a magnetic embolism protection device of the present invention;

[0035] Figure 6 This is a schematic diagram of the cross-section of the unfolding rod in a magnetic embolism protection device of the present invention;

[0036] Figure 7 This is a schematic diagram of the filter assembly in a magnetic embolism protection device of the present invention;

[0037] Figure 8 This is a schematic diagram of the pressurization direction of a magnetic embolism protection device according to the present invention;

[0038] Figure 9 This is a schematic diagram of the connection between the first traction wire and the second traction wire and the permanent magnet in a magnetic embolism protection device according to another embodiment of the present invention;

[0039] In the diagram, 1 is the guide tube; 2 is the filter assembly; 3 is the permanent magnet; 4 is the first cavity; 5 is the second cavity; 6 is the guide wire cavity; 7 is the connecting hole; 8 is the first hole; 9 is the umbrella frame; 10 is the fixing ring; 11 is the moving collar; 12 is the unfolding rod; 13 is the spreading rod; 14 is the second connecting ring; 15 is the limiting shaft; 16 is the connecting groove; 17 is the second connecting hole; 18 is the compressed mesh surface; 19 is the leakage hole; 20 is the drug outlet hole; 21 is the drug storage space; 22 is the first traction wire; and 23 is the second traction wire. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] This embodiment employs a permanent magnet installed inside the catheter, which works in conjunction with an umbrella-shaped support connected to the outside of the catheter. Pressurization within the first lumen causes displacement of the permanent magnet, further actuating the deploying and expanding rods through magnetic force, thus achieving deployment and contraction. By controlling the size of the umbrella's opening, it can adapt to blood vessels of different inner diameters, exhibiting high adaptability. The embolization protection device has a stable and easily controllable structure, effectively intercepting free thrombi, reducing the probability of thromboembolism, and improving the success rate of the procedure. The specific implementation method is as follows:

[0042] like Figure 1-9 As shown, a magnetic embolism protection device includes a conduit 1 and an umbrella-shaped filter assembly 2 disposed on the outer wall of the distal end of the conduit 1. A permanent magnet 3 is disposed inside the conduit 1 to cooperate in opening and closing the umbrella-shaped filter assembly 2. The conduit 1 has a first cavity 4, a second cavity 5, and a guide wire cavity 6 along its length. The first cavity 4 is located near the inner wall of the conduit 1. The second cavity 5 and the guide wire cavity 6 are located side by side on the side of the inner wall of the conduit 1 with a larger distance from the first cavity 4. The distal ends of the first cavity 4 and the second cavity 5 are connected to each other through a connecting hole 7. The permanent magnet 3 is placed in the middle of the first cavity 4. A first hole 8 is provided at the proximal end of the conduit 1, and the first hole 8 is connected to the first cavity 4.

[0043] A permanent magnet 3 is installed inside the catheter 1 in conjunction with an umbrella-shaped filter assembly 2 connected to the outside of the catheter 1. By pressurizing the first cavity 4, the permanent magnet 3 is displaced, which further pushes the filter assembly 2 to unfold through magnetic force. At the same time, by opening a connecting hole 7 at the distal end of the first cavity 4 to connect with the second cavity 5, the pressure is released and the filter assembly 2 is contracted. By controlling the opening size of the umbrella frame 9, it can adapt to blood vessels with different inner diameters, making it highly adaptable. In addition, the embolization protection device has a stable structure and is easy to control. It can effectively intercept free thrombi. Furthermore, the connecting hole 7 allows the pressure entering the first cavity 4 through the first hole 8 to be released, ensuring that the opening rod 13 can be opened outward to a certain angle and then closed inward through pressure release.

[0044] Here, pressurization can be achieved by connecting a pressure pump to the proximal end of the first chamber 4, inputting gas into the first chamber 4, pushing the permanent magnet 3 to the distal end, and after reaching the preset position, sealing the proximal end of the second chamber 5, maintaining pressure, and keeping the umbrella body stable. Depressurization can be achieved by opening the proximal end of the second chamber 5 to the atmosphere, drawing gas from the first chamber 4, pushing the permanent magnet 3 to the proximal end, releasing gas, and closing the umbrella body.

[0045] In a preferred embodiment, the filter assembly 2 includes an umbrella frame 9, a fixed ring 10, and a movable collar 11. The fixed ring 10 is fixedly connected to the guide tube 1 and is fixedly connected to the far end of the umbrella frame 9. The movable collar 11 is slidably sleeved on the outer wall of the guide tube 1 and is fixedly connected to the near end of the umbrella frame 9. The movable collar 11 and the permanent magnet 3 cause the umbrella frame 9 to open and close through magnetic force.

[0046] Here, the connection between the fixed ring 10 and the movable collar 11 and the umbrella frame 9 makes the filter assembly 2 and the catheter 1 coaxially set, so that the umbrella frame 9 has good circumferential wall adhesion, which can prevent thrombi from escaping from the gap between the embolization protection device and the blood vessel wall in multiple directions, and the capture effect is better.

[0047] In a preferred embodiment, the umbrella frame 9 includes a plurality of unfolding rods 12 and a plurality of spreading rods 13. One end of each of the unfolding rods 12 is rotatably connected to a fixed ring 10 via a first connecting ring, and the unfolding rods 12 are equidistantly arranged on the fixed ring 10. One end of each of the spreading rods 13 is rotatably connected to a movable collar 11 via a second connecting ring 14, and the spreading rods 13 are equidistantly arranged on the movable collar 11. The other end of the spreading rod 13 is rotatably connected to the middle part of the unfolding rod 12 via a limiting shaft 15.

[0048] Here, the unfolding rod 12 and the spreading rod 13 are connected to the fixed ring 10 and the movable collar 11. The unfolding rod 12 and the spreading rod 13 provide higher rigidity to the filter assembly 2, so that the filter assembly 2 can better capture blood clots in blood vessels during use.

[0049] In a preferred embodiment, the free end of the spreading rod 13 is provided with a first connecting hole, the middle part of the unfolding rod 12 is provided with a connecting groove 16, the connecting groove 16 matches the spreading rod 13, and the two sides of the connecting groove 16 are provided with second connecting holes 17, which match the limiting shaft 15.

[0050] Here, a connecting groove 16 is provided in the middle of the unfolding rod 12 to ensure the rotational connection between the spreading rod 13 and the unfolding rod 12. At the same time, when the moving collar 11 is subjected to magnetic force, it transmits the force to the unfolding rod 12 through the spreading rod 13, so that the unfolding rod 12 can complete the unfolding and retracting actions.

[0051] Here, to ensure that the movable collar 11 can be magnetically pulled, the movable collar 11 is made of a ferromagnetic material, which is easily magnetized and exhibits magnetism. Therefore, under the action of the permanent magnet 3, the movable collar 11 will be significantly attracted.

[0052] The movable collar 11 is made of a substance containing at least one element: iron, cobalt, or nickel. Preferably, the movable collar 11 is made of one of neodymium iron boron magnets, alnico magnets, samarium cobalt magnets, or ferrite magnets.

[0053] In a preferred embodiment, the outer side of the unfolding rod 12 away from the moving collar 11 is provided with a compression mesh surface 18, the compression mesh surface 18 is fixedly connected to the unfolding rod 12, and a plurality of leakage holes 19 are opened on the compression mesh surface 18 between the unfolding rods 12.

[0054] Here, a compression mesh 18 is provided outside the unfolding rod 12 to prevent thrombi from escaping in the gap between the unfolding rod 12 and the spreading rod 13 during use, resulting in better capture effect. At the same time, by opening a leakage hole 19 on the compression mesh 18, the flow of blood is blocked during the thrombus removal process, which could cause tissue ischemia and damage, thus improving the safety of the operation.

[0055] In a preferred embodiment, the two sides of the unfolding rod 12 adjacent to the compression mesh surface 18 are provided with a plurality of drug outlet holes 20. The drug outlet holes 20 are filled with drugs for thrombolysis. The opening of the drug outlet holes 20 is provided with an aqueous film. When the unfolding rod 12 is expanded and the aqueous film dissolves, the drugs are flushed into the blood under the blood flow and are used to dissolve the captured thrombi.

[0056] Here, dispensing holes 20 for filling thrombolytic drugs are provided on both sides of the unfolding rod 12 perpendicular to the compression mesh surface 18. The thrombus contained in the compression mesh surface 18 is dissolved by the released thrombolytic drugs. Since the compression mesh surface 18 is provided on the outside of the unfolding rod 12 when entering the blood vessel, the drug is prevented from being released prematurely, so that the drug is released again at a specific position to improve the efficiency and draw out the thrombus to clear the blood.

[0057] In a preferred embodiment, the two ends of the unfolding rod 12 opposite to the connecting groove 16 have a medicine storage space 21 inside, and the medicine outlet 20 is connected to the medicine storage space 21.

[0058] Here, drug storage spaces 21 are provided on both sides of the unfolding rod 12 and the connecting groove 16 at a certain distance, and are connected to the drug outlet 20. The setting of the drug storage space 21 ensures that there is enough space in the device to place the thrombolytic agent, and avoids insufficient filling of the drug affecting the thrombolytic effect in the case that the drug is released in advance due to the dissolution of the water-based coating.

[0059] In a preferred embodiment, a connecting hole 7 is provided at the distal end of the first cavity 4 near the movable collar 11, and the connecting hole 7 communicates with the second cavity 5.

[0060] Here, a connecting hole 7 is provided so that the pressure entering the first cavity 4 through the first hole 8 can be discharged, ensuring that the expansion rod 13 can be extended outward to a certain angle and then closed inward through pressure relief, so that the thrombus is compressed by the expansion rod 13 and the compression mesh 18.

[0061] In a preferred embodiment, the permanent magnet 3 is fitted with the inner wall of the conduit 1 with a clearance, and the length of the permanent magnet 3 is greater than the inner diameter of the conduit 1.

[0062] Here, setting the length of the permanent magnet 3 to be larger than the inner diameter of the conduit 1 ensures that the permanent magnet 3 can move back and forth in the first cavity 4 without the permanent magnet 3 rolling over, and also ensures that there is a suitable pushing or pulling force on the moving collar 11.

[0063] In a preferred embodiment, the proximal end and the distal end of the permanent magnet 3 are respectively connected to a first traction wire 22 and a second traction wire 23. The proximal end of the first traction wire 22 extends out of the first hole 8 along the first cavity 4, and the proximal end of the second traction wire 23 extends out of the second cavity 5 along the second cavity 5.

[0064] Here, by fixing a first traction wire 22 and a second traction wire 23 at both ends of the permanent magnet 3, with the first traction wire 22 exiting from the proximal end of the first cavity 4 and the second traction wire 23 passing through the first hole 7 and exiting from the proximal end of the second cavity 5, the proximal ends of the first traction wire 22 and the second traction wire 23, in conjunction with the handle at the proximal end of the device, complete the movement of the permanent magnet 3, thereby enabling the umbrella frame 9 to complete the opening and closing action. Here, a shell can be provided on the outside of the permanent magnet 3, and the shell is then connected to the first traction wire 22 and the second traction wire 23.

[0065] This invention relates to an embolism protection device that utilizes pressurization to drive the opening of the umbrella frame 9. In practical use, gas is injected into the first chamber 4, creating pressure that pushes the permanent magnet 3 within the catheter 1, thereby moving the moving collar 11 to open the umbrella frame 9. The permanent magnet 3 is not constrained axially within the first chamber 4, and it and the moving collar 11 outside the catheter 1 are on the same plane. When the first chamber 4 is pressurized, it pushes the permanent magnet 3 distally to a preset position. Pressurization stops, and the device enters a pressure-holding state. At this time, the umbrella frame 9 and the compression mesh 18 are in an open state. The size of the umbrella frame 9's opening is controlled to accommodate blood vessels of different inner diameters. After thrombectomy or thrombolysis is completed, the pressure within the first chamber 4 decreases, causing the permanent magnet 3 to return to its initial position and the umbrella frame 9 to contract.

[0066] Here, the number of deploying rods 12 should be determined to ensure that the thrombus is controlled and blood flow is not affected. Simultaneously, a drug outlet 20 communicating with the drug storage space 21 is provided on the deploying rod 13, and a water-soluble film is placed on the end face of the drug outlet 20 for sealing. After the deploying rod 12 is deployed, the film on the drug outlet 20 dissolves the drug, which then enters the bloodstream, dissolving the captured thrombus. This allows for more complete removal of the thrombus from the blood vessel and shortens the removal time.

[0067] In another embodiment, a thrombus protection device is used to drive the umbrella frame 9 to open using a traction method. In practical use, since the proximal and distal ends of the permanent magnet 3 are respectively connected to the first traction wire 22 and the second traction wire 23, the permanent magnet 3 is pulled forward to a preset position by pulling the second traction wire 23 towards the proximal end, while simultaneously fixing the first traction wire 22 and the second traction wire 23. At this point, the position of the permanent magnet 3 is stable, and the umbrella frame 9 and the compression mesh surface 18 are in an open state, allowing the thrombus protection device to operate. After the thrombus removal or dissolution work is completed, the first traction wire 22 is pulled towards the proximal end, and the permanent magnet 3 returns to its initial position, retracting the umbrella frame 9.

[0068] The present invention also provides an embolism protection system, including the embolism protection device and a delivery conduit as described above, wherein the delivery conduit can house the embolism protection device and deliver the embolism protection device.

[0069] Here, the delivery catheter is used to assist physicians in placing embolization protectors within the blood vessel. The distal end of the delivery catheter is more flexible, while the proximal end offers better support, ensuring minimal resistance when bending, good maneuverability, and sufficient support. This allows the delivery catheter to easily reach the target location, thereby delivering the embolization protector and improving the success rate and safety of the interventional procedure. The delivery catheter uses a standard, readily available type, with its inner diameter matched to the compressed outer diameter of the embolization protector.

[0070] In this application, a permanent magnet 3 is used to open and close the umbrella frame 9 in the filter assembly 2. However, this is not the only application. Using an electromagnet to open and close the umbrella frame 9 in the filter assembly 2 is also within the scope of protection of this application.

[0071] The term "proximal end" usually refers to the end of the corresponding component that is closer to the operator, while "distal end" refers to the end of the corresponding component that is farther away from the operator.

[0072] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A magnetic embolism protection device, characterized in that, It includes a conduit (1) and an umbrella-shaped filter assembly (2) disposed on the outer wall of the distal end of the conduit (1), and a permanent magnet (3) is disposed inside the conduit (1). The catheter (1) has a first cavity (4), a second cavity (5) and a guidewire cavity (6) along its length. The first cavity (4) is located near the inner wall of the catheter (1). The second cavity (5) and the guidewire cavity (6) are located side by side in the catheter (1). The distal ends of the first cavity (4) and the second cavity (5) are connected to each other through a connecting hole (7). The permanent magnet (3) is placed in the middle of the first cavity (4). The proximal end of the catheter (1) has a first hole (8) that is connected to the first cavity (4). The filter assembly (2) includes an umbrella frame (9), a fixed ring (10), and a movable collar (11). The fixed ring (10) is fixedly connected to the distal end of the conduit (1) and the fixed ring (10) is fixedly connected to the distal end of the umbrella frame (9). The movable collar (11) is slidably sleeved on the outer wall of the conduit (1) and the movable collar (11) is fixedly connected to the proximal end of the umbrella frame (9). The movable collar (11) and the permanent magnet (3) use magnetic force to open and close the umbrella frame (9).

2. The magnetic embolism protection device according to claim 1, characterized in that, The umbrella frame (9) includes several unfolding rods (12) and several spreading rods (13). One end of each of the unfolding rods (12) is rotatably connected to the fixed ring (10) through a first connecting ring, and the unfolding rods (12) are equidistantly arranged on the fixed ring (10). One end of each of the spreading rods (13) is rotatably connected to the movable collar (11) through a second connecting ring (14), and the spreading rods (13) are equidistantly arranged on the movable collar (11). The other end of the spreading rod (13) is rotatably connected to the middle part of the unfolding rod (12) through a limiting shaft (15).

3. The magnetic embolism protection device according to claim 2, characterized in that, The free end of the spreading rod (13) is provided with a first connecting hole, and the middle part of the unfolding rod (12) is provided with a connecting groove (16). The connecting groove (16) matches the spreading rod (13). The two sides of the connecting groove (16) are provided with second connecting holes (17). The first connecting hole and the second connecting hole (17) match the limiting shaft (15).

4. The magnetic embolism protection device according to claim 3, characterized in that, The outer side of the unfolding rod (12) away from the moving collar (11) is provided with a compression mesh surface (18), the compression mesh surface (18) is fixedly connected to the unfolding rod (12), and a plurality of leakage holes (19) are opened on the compression mesh surface (18) between the unfolding rods (12).

5. A magnetic embolism protection device according to claim 4, characterized in that, The unfolding rod (12) has several drug outlet holes (20) on its two sides adjacent to the compression mesh surface (18). The drug outlet holes (20) contain drugs for thrombolysis, and the opening of the drug outlet holes (20) is covered with an aqueous film.

6. A magnetic embolism protection device according to claim 5, characterized in that, The unfolding rod (12) has a medicine storage space (21) inside both ends away from the connecting groove (16), and the medicine outlet (20) is connected to the medicine storage space (21).

7. A magnetic embolism protection device according to claim 1, characterized in that, The permanent magnet (3) is fitted with the inner wall of the conduit (1) with a gap, and the length of the permanent magnet (3) is greater than the inner diameter of the conduit (1).

8. A magnetic embolism protection device according to any one of claims 1-7, characterized in that, The permanent magnet (3) has a first traction wire (22) and a second traction wire (23) connected to its proximal and distal ends, respectively. The proximal end of the first traction wire (22) extends out of the first hole (8) along the first cavity (4), and the proximal end of the second traction wire (23) extends out of the second cavity (5) along the second cavity (5).

9. An embolism protection system, characterized in that, The device includes an embolism protection device and a delivery conduit as described in any one of claims 1-8, wherein the delivery conduit can house and deliver the embolism protection device.

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