Intracranial embolism protection device

Abstract

The invention provides an intracranial embolism protection device, and belongs to the technical field of embolism protection devices. The device comprises an embolus filter screen, the far end of the expanded embolus filter screen is closed, the near end of the expanded embolus filter screen is provided with an open collecting opening used for collecting free embolus in a blood vessel, the far end of the embolus filter screen is fixedly connected with a filter screen rod body, and the near end of the embolus filter screen is movably connected with a guide wire. The embolus filter screen is used for preventing the embolus filter screen from shaking in a blood vessel along with the movement of a guide wire to damage the blood vessel, the embolus filter screen is formed by cutting a metal piece through laser, the sizes of meshes in the embolus filter screen are approximately uniform, and the metal piece is in a conical shape with a small far end and a large near end; the technical problems that according to an intracranial embolism protection device in the prior art, due to the fact that a filter screen is formed by weaving, flexibility is insufficient after contraction, the size is large after compression, the filter screen and a sheathing canal are not prone to being disassembled and assembled, and the blood flow speed is easily hindered due to large mesh difference are solved. In addition, the technical problem that vasospasm is easily caused by fixed connection of the filter screen and the guide wire is solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of embolic protection devices, and in particular relates to an intracranial embolic protection device. Background Art

[0002] Interventional surgery is to deliver instruments through the human blood vessels to the lesion site for diagnosis and treatment under the guidance of imaging technology. When using instruments to pass through stenotic lesions, it may cause the stenotic lesion tissue (i.e. embolus) to fall off and cause embolism of distal blood vessels.

[0003] Distal embolic protection devices are mainly used in vascular interventional surgery. Their function is to prevent emboli from escaping and are used for distal protection of intracranial vascular reconstruction surgery.

[0004] For example, the protective devices currently on the market are mainly used to protect against atherosclerotic stenosis of the carotid artery, which may cause atherosclerotic plaques to fall off during interventional treatment. The detached plaques may cause occlusion of distal cerebral blood vessels, endangering the patient's nerve tissue and function. During surgery, the embolic protector is released through a guidewire at the distal position of the stenosis, which can intercept the detached emboli without affecting the normal flow of blood in the blood vessel lumen. When the stenosis of the blood vessel lumen is opened, the embolic protector and the intercepted emboli are collected into the catheter and removed from the body.

[0005] In the prior art, the filter screen (i.e., embolic filter screen) in the commonly used embolic protection device is woven from metal wires, which usually need to be woven into a cylinder of equal diameter, then tied at one end, and formed into a specified shape using a conical mold. The filter screen made in this way has the following problems:

[0006] (1) After the entire filter is shrunk, the number of metal wires along the length direction is the same, which will cause the overall flexibility of the filter to be insufficient. Therefore, when the operator uses it, the embolic protector needs to be advanced inside the twisted blood vessel. The insufficiently flexible filter will make it extremely inconvenient to advance the embolic protector, which requires a high level of operator experience and may cause damage to the patient if not handled with care.

[0007] (2) The woven filter has nodes where the metal wires are fixed and overlapped, resulting in a larger radial dimension of the entire filter after compression and contraction, making it difficult to compress into the sheath. At the same time, it will also cause difficulty in releasing the filter in the blood vessel. The large size of the filter will also prevent the embolic protector from reaching a more distal position in the blood vessel (high position of the intracranial posterior circulation blood vessels). Furthermore, the overlapping of the metal wires reduces the flexibility of the filter after expansion, making the filter poorly fit the blood vessel and easily forming a gap with the blood vessel wall, causing emboli to escape from the gap, affecting the embolus capture effect.

[0008] (3) The mesh of the woven filter is uneven, with the distal aperture smaller than the proximal aperture. When a certain amount of embolus is captured at the distal end, the small end of the filter will form a "blocking piece" that hinders the flow of blood.

[0009] In addition, the filter in the prior art is directly fixedly connected to the guide wire. When the operator touches the rod of the extracorporeal guide wire or inserts other instruments along the rod of the guide wire during the operation, the filter body will shake, stimulating the blood vessel wall and easily causing vascular spasm, affecting the surgical effect. Summary of the invention

[0010] The purpose of the present invention is to provide an intracranial embolism protection device to solve the technical problems in the prior art that the intracranial embolism protection device is made of a woven filter, has insufficient flexibility after contraction, is large in size after compression and is not easy to be disassembled and assembled with a sheath, and is easy to hinder blood flow rate due to large differences in mesh sizes; in addition, it also solves the technical problem that vascular spasm is easily caused by the fixed connection between the filter and the guide wire.

[0011] In order to achieve the above-mentioned purpose of the invention, the intracranial embolism protection device of the present invention provides the following technical solutions:

[0012] An intracranial embolism protection device includes an embolic filter, which is closed at the distal end after expansion and has an open collecting port at the proximal end for collecting free emboli in the blood vessel. The distal end of the embolic filter is fixedly connected to a filter rod, and the proximal end of the embolic filter is movably connected to a guide wire to prevent the embolic filter from shaking in the blood vessel as the guide wire moves, thereby damaging the blood vessel. The embolic filter is made of metal parts through laser cutting, and the mesh size on the embolic filter is nearly uniform. The shape of the metal parts is a cone with a small distal end and a large proximal end.

[0013] As a further preferred technical solution: the mesh shape of the embolic filter is a "sinusoidal hole" shape composed of symmetrical sinusoidal curves; the shape of the collecting port is a "sinusoidal hole" shape.

[0014] As a further preferred technical solution: the main body of the embolic filter is composed of a three-layered structure to ensure the supporting strength of the embolic filter after expansion.

[0015] As a further preferred technical solution: the middle layer of the three-layered structure is a developing layer, which is used to display the pushing position of the embolus filter.

[0016] As a further preferred technical solution: a drug storage unit is arranged outside the embolic filter for loading and releasing thrombolytic drugs.

[0017] As a further preferred technical solution: the drug storage unit includes a drug loading groove opened outside the embolic filter, a drug releasing net for closing the drug loading groove is arranged on the notch of the drug loading groove, and the mesh holes on the drug releasing net constitute drug releasing holes.

[0018] As a further preferred technical solution: the proximal end of the embolic filter is fixedly connected to a connecting rod, the proximal end of the connecting rod is movably connected to the distal end of the guide wire, and the embolic filter is movably connected to the guide wire through the connecting rod.

[0019] As a further preferred technical solution: a universal ball joint is provided at the proximal end of the connecting rod, and the connecting rod is movably connected to the distal end of the guide wire through the universal ball joint.

[0020] As a further preferred technical solution: a developing structure is provided at the distal end of the filter rod body for displaying the real-time position of the distal end of the intracranial embolism protection device.

[0021] As a further preferred technical solution: the developing structure is a coil spring to increase the flexibility when pushing the intracranial embolism protection device.

[0022] The proximal end of the embolic filter is movably connected to the guide wire to prevent the embolic filter from shaking in the blood vessel with the movement of the guide wire to damage the blood vessel. The embolic filter is made of a metal piece by laser cutting. The shape of the metal piece is a cone with a small distal end and a large proximal end.

[0023] Beneficial effects: First, the embolic filter is made of conical metal parts cut by laser, and the overall flexibility is better and safer after shrinking than the existing woven filter, so it is convenient to advance inside twisted blood vessels and facilitate surgical operations; secondly, because the embolic filter does not have overlapping metal wires, the size after compression and contraction is smaller than that of the existing woven filter, which is convenient for placement inside the sheath, and also convenient for pushing into the blood vessel from the inside of the sheath. Due to the smaller size after compression and gripping, the device can be pushed to a more distal position in the blood vessel. At the same time, the embolic filter has better flexibility after self-expansion, and the expanded shape can be adjusted according to the specific shape of the blood vessel during expansion, so that the embolic filter fits the blood vessel wall well, thereby improving the interception effect of the emboli; thirdly, the mesh size on the embolic filter is nearly uniform, so in the process of capturing emboli, the blood flow rate is less affected than the existing uneven mesh size. Finally, by flexibly connecting the embolic filter to the guide wire, the degree of following the embolic filter to the guide wire is reduced, avoiding the shaking of the filter body when the operator touches the rod of the extracorporeal guide wire or inserts other instruments along the rod of the guide wire during the operation, thereby reducing the probability of vascular spasm. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0025] Figure 1 This is a schematic diagram of the overall structure of an intracranial embolism protection device according to an embodiment of the present invention;

[0026] Figure 2 A schematic structural diagram of a filter rod body according to an embodiment of the present invention;

[0027] Figure 3 This is a main structural diagram of an embolic filter according to an embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of an enlarged structure of a mesh of an embolic filter according to an embodiment of the present invention;

[0029] Figure 5 It is a schematic structural diagram of a collection port of an embolic filter according to an embodiment of the present invention;

[0030] Figure 6 The figure is a schematic diagram of the structure of a universal ball joint rotation pair according to an embodiment of the present invention.

[0031] In the figure: 1. embolus filter; 101. collecting port; 102. drug storage unit; 1021. drug loading tank; 1022. drug release net; 2. filter rod; 3. guide wire; 4. universal ball joint; 401. connecting sleeve; 402. spherical joint; 403. ball bearing; 5. connecting rod; 6. developing structure. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0033] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0035] Embodiment 1 of the intracranial embolism protection device of the present invention:

[0036] The present invention provides an intracranial embolism protection device, which forms an embolic filter by laser cutting a conical metal part, so that the embolic filter has better overall flexibility, smaller size, and higher safety. The embolic filter is movably connected to a guide wire to reduce the degree of follow-up of the embolic filter and the guide wire, thereby reducing the probability of vasospasm during surgery.

[0037] Specifically, Figure 1 As shown, the intracranial embolism protection device includes an embolus filter 1, the distal end of which is connected to a filter rod 2, and the proximal end of which is movably connected to a guide wire 3 via a connecting rod 5. During surgery, the embolism protection device is transported to a designated embolus collection position via a sheath (not shown) outside the guide wire 3.

[0038] After the embolic filter 1 is expanded, the distal end is closed and the proximal end has an open collection port 101 for collecting free emboli in the blood vessels. It should be noted here that in the present application, "distal end" uniformly refers to the end away from the operator, and "proximal end" is just the opposite. Among them, the embolic filter 1 is made of a conical metal piece with a small distal end and a large proximal end through laser cutting. In this way, because the metal content of the distal end of the conical metal piece is less than that of the proximal end, the silk content of the embolic filter 1 in the length direction gradually decreases from the proximal end to the distal end. Therefore, the radial size of the embolic filter 1 gradually decreases from the proximal end to the distal end after contraction. After contraction, the overall flexibility of the embolic filter 1 is better, the safety is higher, and it is more convenient to advance inside the twisted blood vessel, which is convenient for surgical operation. Since the embolic filter 1 is smaller in size after shrinking, the intracranial embolic protection device can reach the A4 segment, M4 segment, traffic segment or higher position of the distal intracranial blood vessel. Therefore, the radial maximum size of the main body of the embolic filter 1 after expansion is 1.5mm-2mm (it can be any size from 1.5mm to 2mm, and the specific size needs to be determined according to the installation position of the embolic filter 1). In the process of processing the embolic filter 1, the mesh size on the embolic filter 1 is processed to be nearly uniform, so that the overall flexibility of the embolic filter 1 is better after expanding in the blood vessel, so that in the process of capturing emboli, compared with the existing situation of uneven mesh size, the blood flow rate is less affected. It should be noted here that the mesh holes on the embolic filter 1 recorded in the present invention are nearly uniform in comparison with the mesh holes of the woven mesh in the prior art, which are quite different. The difference between the mesh holes on the embolic filter 1 is not as large as the mesh holes of the woven mesh in the prior art, rather than being strictly consistent in size. In order to better push, release and recover the embolic filter 1, the mesh holes near the collection port 101 are slightly larger than the mesh holes of the main body of the embolic filter 1.

[0039] In order to ensure a smaller gripping size and a larger self-expansion size of the embolic filter 1, the mesh shape of the embolic filter 1 is a "sine wave hole" shape composed of symmetrical sine wave curves. Figure 4 As shown, the period of the sine wave is preferably 1mm-2mm (for example, it can be any value in the range of 1mm-2mm, such as 1mm, 1.1mm, 1.15mm, etc.), and the extreme value is 0.3-0.5 (for example, it can be any value in the range of 0.3-0.5, such as 0.3, 0.31, 0.32, etc.), which can not only press the embolic filter 1 into a smaller sheath, but also expand to a larger size to fit the blood vessel wall, so as to better capture the thrombus. Figure 5As shown, the collecting port 101 is preferably cut into a relatively large inclined "sine wave hole" shape with an inclination angle of 20 degrees to 40 degrees, so that an eccentric structure can be formed after the embolic filter 1 is released, which helps to better capture the emboli. The mesh near the collecting port 101 is a closed-loop structure, and the ends of all the meshes connected to the collecting port 101 are connected to the collecting port 101, which can facilitate better recovery of the emboli after the embolic filter 1 captures the emboli. The recovery end of the collecting port 101 is connected to the connecting rod 5, and the connection method can be welding, bonding or integrated processing.

[0040] In order to ensure the supporting strength of the embolic filter 1 after expansion, the main body of the embolic filter 1 is composed of a three-layer composite structure, the innermost layer is a nickel-titanium alloy layer, the middle layer is a platinum-iridium alloy layer, and the outermost layer is a nickel-titanium alloy layer. Among them, the middle layer as a developing and main supporting layer contains a platinum-iridium alloy material, which can make the filter after cutting visible, so that the operator can see the state and pushing position of the embolic filter 1 at a glance, thereby improving the convenience of surgical operation and facilitating surgical operation.

[0041] During the surgical operation, the operator will inevitably touch the rod of the extracorporeal guide wire 3 or insert other instruments along the rod of the guide wire 3. At this time, if the embolic filter 1 is fixedly connected to the guide wire 3, the embolic filter 1 will vibrate along with the vibration of the rod of the guide wire 3, which may cause vascular spasm. Therefore, in order to prevent the embolic filter 1 from vibrating along with the movement of the guide wire 3 in the blood vessel to damage the blood vessel, the proximal end of the embolic filter 1 is fixedly connected with a connecting rod 5, and the proximal end of the connecting rod 5 is movably connected to the distal end of the guide wire 3, and the embolic filter 1 is movably connected to the guide wire 3 through the connecting rod 5. In this embodiment, a universal ball rotating pair 4 is provided at the proximal end of the connecting rod 5, and the connecting rod 5 is movably connected to the distal end of the guide wire 3 through the universal ball rotating pair 4.

[0042] Specifically, Figure 6As shown, the universal ball joint 4 includes a connecting sleeve 401, which is fixedly connected to the distal end of the guide wire 3, and a connecting cavity is provided in the connecting sleeve 401. The proximal end of the connecting rod 5 is fixedly connected with a spherical joint 402, and the spherical joint 402 is installed in the connecting cavity of the connecting sleeve 401. The connecting cavity has a closing end that is smaller than the diameter of the spherical joint 402, and the connecting cavity has a movable space for the spherical joint 402 to rotate, so that the spherical joint 402 can be mounted in the connecting sleeve 401 through the closing end and rotatably connected to the connecting sleeve 401, thereby improving the rotation flexibility of the embolic filter 1. In this way, the universal ball joint 4 plays an isolating role in the circumferential movement of the guide wire 3, and reduces the following degree of the embolic filter 1 and the guide wire 3. During the surgical operation, since the universal ball joint 4 provides the embolic filter 1 with nearly 360 degrees of free rotation, the fit between the embolic filter 1 and the blood vessel is more stable, thereby reducing the occurrence of vascular spasm. In order to reduce the friction between the movable cavity and the spherical joint 402, a ball bearing 403 is arranged in the movable cavity. In this embodiment, the spherical joint 402 is a perfect sphere, because the arc of the perfect sphere is the major arc, the major arc can contact more with the ball bearing 403, the movement is smoother, and the smoothness of rotation is increased.

[0043] like Figure 3 , Figure 4 As shown, in order to make the embolic filter 1 have the functions of collecting emboli and thrombolysis at the same time, so that the treatment methods of collecting emboli and thrombolysis can be used at the same time, so that the emboli that cannot be collected because the volume is smaller than the mesh of the embolic filter 1 can be dissolved, a drug storage unit 102 is arranged on the outside of the embolic filter 1 for loading and releasing thrombolytic drugs. In this embodiment, the drug storage unit 102 includes a drug loading groove 1021 opened on the outside of the embolic filter 1 by laser cutting, and the drug loading groove 1021 is opened on the outer layer and middle layer structure of the embolic filter 1. A detachably connected drug release net 1022 is arranged on the notch of the drug loading groove 1021, and the drug release net 1022 is used to close the notch of the drug loading groove 1021 to prevent the drug in the drug loading groove 1021 from being directly scattered in the blood vessel, wherein the mesh on the drug release net 1022 constitutes a drug release hole. In this embodiment, the thrombolytic drugs may be urokinase, streptokinase, alteplase, reteplase and other drugs with thrombolytic effects; the thrombolytic drugs are contained in the drug loading tank 1021 and released into the blood vessel through the drug release hole, so as to capture the thrombus during the operation and also have a certain degree of thrombolytic effect, thereby making the treatment more thorough.

[0044] like Figure 2As shown, a developing structure 6 is provided at the distal end of the filter rod body 2 for displaying the real-time position of the distal end of the intracranial embolic protection device, which allows the operator to clearly observe the position of the distal end during the operation, thereby reducing misjudgment and misoperation. In this embodiment, the developing structure 6 is a coil spring to increase the flexibility when pushing the intracranial embolic protection device. The coil spring increases the outer diameter of the distal end of the guide wire 3 while maintaining the bending strength, thereby increasing the support force of the guide wire 3 during pushing and the flexibility of the tortuous part. At the same time, the coil spring increases the torque transmission. When the guide wire 3 is rotated during the operation, the distal end of the guide wire 3 can be twisted synchronously to avoid the swinging phenomenon of the distal head end.

[0045] In this embodiment, the delivery tool for delivering the intracranial embolic protection device to the high-position blood vessel is a sheath tube, because the laser-cut sinusoidal wave micro-mesh design is adopted, which can make the main body of the embolic filter 1 smaller after being pressed and gripped; at the same time, the three-layer composite material used in this embodiment can still ensure strength after self-expansion, and can also be fully developed, and at the same time, the design of the distal and proximal development points and the limit tube of the embolic filter 1 in the prior art is cancelled, so that the delivery sheath tube that can be used is smaller. Therefore, the sheath tube can integrate delivery and recovery, and preferably the sheath tube can be the same as the thrombus removal stent, and the diameter can be 1.0F-1.5F or even smaller.

[0046] The working principle of the present invention is as follows: during surgery, the embolic filter 1 needs to be fixedly connected to the guide wire 3 first, and then the embolic filter 1 is compressed, contracted and installed into the sheath, and the device is slowly pushed into the blood vessel through the sheath. After reaching the designated position, the embolic filter 1 is released from the sheath, and the embolic filter 1 automatically expands and adheres to the inner wall of the blood vessel to cooperate with the intracranial vascular reconstruction surgery to collect and dissolve the thrombus.

[0047] In summary, the present invention has the following advantages:

[0048] 1. The embolic filter after laser cutting can achieve smaller size compression and grip and larger size self-expansion, with better flexibility and higher safety, thus facilitating advancement inside twisted blood vessels and facilitating surgical operations.

[0049] 2. Because there are no overlapping metal wires in the embolic filter, its size after compression and contraction is smaller than that of the existing braided filter, which makes it easier to place it inside the sheath and push it into the blood vessel from the inside of the sheath. Because of its smaller size after compression and gripping, the device can be pushed to a more distal position in the blood vessel. At the same time, the embolic filter has better flexibility after self-expansion and better performance in fitting the blood vessel wall, thus achieving a better embolus interception effect.

[0050] 3. The mesh size of the embolic filter is uniform, so that in the process of capturing emboli, the blood flow rate is less affected than the existing situation where the mesh size is uneven.

[0051] 4. The connecting rod and the guide wire are connected by a universal ball joint, which can provide the embolic filter body with nearly 360-degree free rotation and a certain displacement of axial movement, making the embolic filter more adherent to the blood vessel. At the same time, the universal ball joint isolates the movement of the embolic filter and the guide wire, effectively preventing the rotational force of the guide wire from being transmitted to the embolic filter body, reducing the occurrence of vascular spasm.

[0052] 5. The collection port is a large sine wave hole, which enables eccentric filter deployment and better fits the blood vessels

[0053] 5. After laser cutting, there are no overlapping metal wire nodes on the surface of the embolic filter, which can contact the blood vessels smoothly and further reduce the stimulation to the blood vessel wall.

[0054] 7. The use of a coil spring at the distal end of the development structure increases the outer diameter of the distal guide wire while maintaining the bending strength, thereby increasing the support force during the pushing of the guide wire and the flexibility of the guide wire in the tortuous area.

[0055] 8. The main body of the embolic filter 1 is made of a composite material of three layers of ultra-thin metal sheets, and is cut by laser. The innermost layer is a nickel-titanium alloy layer, the middle layer is a platinum-iridium alloy layer as a developer and main body support, and the outermost layer is a nickel-titanium alloy layer. The platinum-iridium alloy material can make the filter visible after cutting, so that the doctor can see the status of the filter at a glance, which is convenient for surgical operations.

[0056] 9. The main body of the embolic filter can be laser cut to form a drug-loading groove, which contains drugs with thrombolytic effects. The thrombolytic drugs can be released in the blood vessels, capturing thrombi during surgery and achieving a certain degree of thrombolytic effect.

[0057] In other embodiments of the intracranial embolic protection device, different from Embodiment 1, in Embodiment 1, the connecting rod is movably connected to the guide wire through a universal ball rotating pair, while in this embodiment, the connecting rod is movably connected to the guide wire through a universal joint.

[0058] In other embodiments of the intracranial embolic protection device, different from Embodiment 1, in Embodiment 1, the mesh of the embolic filter is a "sine wave hole" shape composed of symmetrical sinusoidal wave curves, while in this embodiment, the mesh of the embolic filter is elliptical.

[0059] In other embodiments of the intracranial embolic protection device, different from Embodiment 1, in Embodiment 1, the drug storage unit is opened on the outside of the embolic filter, while in this embodiment, the drug storage unit is a thrombolytic coating coated on the outside of the embolic filter.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A device for protecting against intracranial embolism, characterized in that: The invention comprises an embolic filter (1), wherein the distal end of the embolic filter (1) is closed after expansion and the proximal end has an open collecting port (101) for collecting free emboli in a blood vessel, the distal end of the embolic filter (1) is fixedly connected to a filter rod (2), and the proximal end of the embolic filter (1) is movably connected to a guide wire (3) for preventing the embolic filter (1) from shaking in the blood vessel as the guide wire (3) moves, thereby damaging the blood vessel, the embolic filter (1) is formed by laser cutting of a metal piece, and the mesh size of the embolic filter (1) is nearly uniform, and the shape of the metal piece is a cone with a small distal end and a large proximal end.

2. The intracranial embolic protection device according to claim 1, characterized in that: The mesh shape of the embolus filter (1) is a "sine wave hole" shape formed by a combination of symmetrical sinusoidal wave curves; the shape of the collection port (101) is a "sine wave hole" shape.

3. The intracranial embolic protection device according to claim 1 or 2, characterized in that: The main body of the embolic filter (1) is composed of a three-layer composite structure to ensure the supporting strength of the embolic filter (1) after expansion.

4. The intracranial embolic protection device according to claim 3, characterized in that: The middle layer of the three-layered structure is a developing layer, which is used to display the pushing position of the embolus filter (1).

5. The intracranial embolic protection device according to claim 2, characterized in that: A drug storage unit (102) is arranged outside the embolic filter (1) for loading and releasing thrombolytic drugs.

6. The intracranial embolic protection device according to claim 5, characterized in that: The drug storage unit (102) comprises a drug loading groove (1021) disposed outside the embolic filter (1), a drug releasing net (1022) for closing the drug loading groove (1021) being arranged on the notch of the drug loading groove (1021), and mesh holes on the drug releasing net (1022) constitute drug releasing holes.

7. The intracranial embolic protection device according to claim 1, characterized in that: The proximal end of the embolic filter (1) is fixedly connected to a connecting rod (5), the proximal end of the connecting rod (5) is movably connected to the distal end of the guide wire (3), and the embolic filter (1) is movably connected to the guide wire (3) via the connecting rod (5).

8. The intracranial embolic protection device according to claim 7, characterized in that: A universal ball joint (4) is provided at the proximal end of the connecting rod (5), and the connecting rod (5) is movably connected to the distal end of the guide wire (3) via the universal ball joint (4).

9. The intracranial embolic protection device according to claim 1, characterized in that: The distal end of the filter rod body (2) is provided with a developing structure (6) for displaying the real-time position of the distal end of the intracranial embolism protection device.

10. The intracranial embolic protection device according to claim 9, characterized in that: The developing structure (6) is a coil spring to increase the flexibility when pushing the intracranial embolism protection device.

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