Filter weaving method, filter and embolic protector

Abstract

The present invention relates to a filter weaving method, a filter and an embolic protector, comprising weaving: weaving a base material into a cylindrical mesh structure; closing: closing the end of the mesh structure, winding two interlaced wires at each interlacing point at the end of the mesh structure around a positioning member of a positioning structure in directions diverging from each other, until the two interlaced wires at the same interlacing point are interlaced with each other. The present invention has the effect of improving the radial supporting force of the large port surface, reducing the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out of the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter to collect thrombus particles and improving the effect of the use of the embolic protector.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a filter screen weaving method, a filter screen and an embolic protector. Background Art

[0002] An embolus is a mass within a blood vessel. Emboli retained in a narrowed blood vessel may cause blockage of blood vessels in distal parts of the body. For example, during valve repair or replacement surgery, manipulation of a calcified valve may cause the movement of calcified material, tissue particles and other debris. Calcified material, tissue particles and other debris may form masses, thereby forming an embolism. If the embolism is located in the heart or aorta, the embolism may cause infarction in any part of the body. Embolic debris may migrate through the circulatory system and cause vascular occlusion, blood clots and cerebrovascular accidents and strokes. One way to reduce the risk of these complications is to place an embolic protector downstream of the surgical treatment site to capture any emboli that may block the blood vessel. Once the embolism is captured, the embolic protector must be carefully closed and removed from the patient's body to prevent the captured embolism from re-dispersing into the blood vessel.

[0003] The embolic protector uses a woven mesh to collect free thrombus particles. It can collect solid particles and allow blood to flow through. However, the large end surface of the embolic protector is currently only closed with a guide wire made of memory material. Although this closing method can collect free thrombus particles, the fit between the large end surface and the blood vessel wall is not high. Smaller thrombi can easily flow out from the gap between the large end surface and the thrombus wall, affecting the collection of thrombus particles and the effectiveness of the embolic protector. Summary of the invention

[0004] Therefore, the present invention aims to solve the technical problem that the large port closing and the blood vessel wall have a low fit, smaller thrombi are easy to flow out, and the collection of thrombus particles is affected, thereby providing a filter weaving method, a filter and an embolic protector.

[0005] A filter mesh weaving method,

[0006] include:

[0007] Weaving: Weaving the base material into a cylindrical mesh structure;

[0008] Closing: Closing the ends of the mesh structure, winding the two interlaced wires at each interlacing point at the ends of the mesh structure around the positioning piece of the positioning structure in directions away from each other until the two interlaced wires at the same interlacing point are interlaced with each other.

[0009] Furthermore, in the closing step, the interwoven wires are wound in an S shape on the positioning piece of the positioning structure.

[0010] Furthermore, the angle between the plane where the positioning structure is located and the axial direction of the mesh structure is set to 20 degrees to 80 degrees.

[0011] Furthermore, the plane where the positioning structure is located is 45 degrees to the axial direction of the mesh structure.

[0012] Furthermore, the end opening of the mesh structure is elliptical, and the positioning member is a positioning rod.

[0013] Furthermore,

[0014] After the closing step, the method further comprises:

[0015] The mesh structure is heat-set and fixed.

[0016] Furthermore,

[0017] After the closing step, the method further comprises:

[0018] Removal: removing the positioning structure from the end of the mesh structure.

[0019] Furthermore, the substrate is made of shape memory material.

[0020] A filter screen is manufactured based on the filter screen weaving method.

[0021] An embolic protector comprises the filter screen.

[0022] Also includes:

[0023] A guide wire, wherein the filter is connected to the distal end of the guide wire and is suitable for pushing the filter away from the outer sheath and releasing it to fit with the blood vessel wall;

[0024] The outer sheath tube is provided with the filter screen and the guide wire passing through the outer sheath tube.

[0025] Also includes:

[0026] The developing ring is arranged at the end of the filter screen.

[0027] The technical solution of the present invention has the following advantages:

[0028] 1. The filter mesh weaving method provided by the present invention comprises weaving: weaving a base material into a cylindrical mesh structure; closing: closing the end of the mesh structure, winding the two interlaced wires of each interlacing point at the end of the mesh structure around the positioning piece of the positioning structure in directions diverging from each other, until the two interlaced wires at the same interlacing point are interlaced with each other, when weaving, weaving two groups of base materials in opposite directions, weaving the base materials into a cylindrical mesh structure, at this time, untying the base material woven at one end of the mesh structure, at this time, when each interlacing point of the mesh structure is untied, two interlaced wires will appear, at this time, the two interlaced wires are wound around the positioning piece of the positioning structure in directions diverging from each other, until one circle of the end of the mesh structure is untied and wound around the positioning piece of the positioning structure, completing the closing, and then fixing the entire filter mesh, in During the weaving process of the filter, the large port surface is closed by winding two interwoven wires of the untied base material in a circle of the large port surface on the positioning piece in opposite directions, so that the interwoven wires untied at the interwoven points of a circle of the mesh structure are stacked and wound together. At this time, the large port surface is formed by the stacked base materials, and the stacked base material interwoven wires provide support force, thereby improving the radial support force of the large port surface. When the filter is delivered into the blood vessel, due to the improved radial support force of the large port surface, the large port surface and the inner wall of the blood vessel are closely fitted when the filter is unfolded, which reduces the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out from the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter to collect thrombus particles and improving the use effect of the embolic protector.

[0029] 2. In the filter screen weaving method provided by the present invention, in the closing step, the interwoven wires are wound in an S shape on the positioning piece of the positioning structure. By means of the above-mentioned S-shaped winding on the positioning piece of the positioning structure, during the winding process, after the two interwoven wires at one interwoven point are wound, the two interwoven wires will not easily disperse from the positioning piece of the positioning structure, thereby making it convenient for the staff to untie the two interwoven wires at the next interwoven point and then wind the two newly generated interwoven wires on the positioning piece of the positioning structure.

[0030] 3. In the filter weaving method provided by the present invention, the angle between the plane where the positioning structure is located and the axial direction of the mesh structure is set to 20 degrees-80 degrees. Since there is an angle between the plane where the positioning structure is located and the mesh structure, when the mesh structure is woven and the large port surface is closed, the angle between the large port surface and the mesh structure in the axial direction is also consistent with the angle of the positioning structure due to the setting of the angle of the positioning structure. Since the angle between the large port surface of the filter and the axial direction of the filter is set to 20 degrees to 80 degrees, the large port surface of the filter can more easily pass through curved blood vessels. At the same time, the oblique large port surface has a larger area than the vertical one, so it has a stronger ability to capture thrombi, thereby improving the ability of the filter to collect thrombus particles and improving the use effect of the embolic protector.

[0031] 4. In the filter weaving method provided by the present invention, the plane where the positioning structure is located is at an angle of 45 degrees to the axial direction of the mesh structure, so that the plane where the large port surface of the woven filter is located and the axial direction of the filter are at an angle of 45 degrees, thereby maximizing the area of ​​the large port surface, thereby maximizing the ability to capture thrombus, further improving the ability of the filter to collect thrombus particles, and improving the use effect of the embolic protector.

[0032] 5. The filter mesh weaving method provided by the present invention, the end of the mesh structure is closed in an elliptical shape, and the positioning member is a positioning rod. Through the setting of the positioning rod, when the large port surface is closed, the two interwoven wires that appear when the interwoven points of the filter mesh are untied are respectively wound half a circle on multiple positioning rods in opposite directions, so that the two interwoven wires untied at the interwoven points are interwoven again at the ends after being wound. After all the interwoven points of one circle of the large port surface are untied and wound on the positioning rod, the interwoven wires stacked on each other are fixed by hemostatic forceps for shaping.

[0033] 6. The filter weaving method provided by the present invention further includes shaping after the closing step, and heat-setting and fixing the mesh structure. After the mesh structure is woven and the two interwoven wires separated by the untied interwoven points are wrapped around the large port surface on the positioning structure, the interwoven wires stacked on each other are fixed with hemostatic forceps, and the filter as a whole is sent into a heat-setting machine to heat-set the large port surfaces stacked on each other of the mesh structure, so that the interwoven wires stacked on each other are fixed and will not spread out. The interwoven wires stacked on each other provide greater radial supporting force, so that after the filter enters the blood vessel, the large port closing edge and the blood vessel wall have a high degree of fit after the filter is unfolded, thereby improving the collection capacity of thrombus particles and improving the use effect of the embolic protector.

[0034] 7. In the filter mesh weaving method provided by the present invention, the substrate is composed of a shape memory material, and the filter mesh made of the shape memory material can better adapt to the inner wall shapes of different blood vessels and has better wall adhesion.

[0035] 8. The embolic protector provided by the present invention comprises a filter screen and a guide wire, wherein the filter screen is connected to the distal end of the guide wire and is suitable for pushing the filter screen away from the outer sheath tube and releasing it to fit the blood vessel wall; the outer sheath tube, the filter screen and the guide wire are inserted into the outer sheath tube, and when in use, the woven filter screen shrinks in the outer sheath tube, and during surgery, the outer tube together with the filter screen is inserted into a blood vessel of the human body where a thrombus exists, and after being pushed to the downstream of the surgical site, the guide wire is pushed to withdraw the filter screen from the outer sheath tube, and at this time, after the filter screen leaves the constraint of the outer sheath tube, due to the shape memory of the woven substrate, the filter screen will automatically return to its original funnel shape, and at this time, the large port of the filter screen will be closed close to the inner wall of the blood vessel, and due to the large port closing The large port surface is formed by stacking the interwoven wires of the base material together, and the stacked interwoven wires of the base material provide support force, thereby improving the radial support force of the large port surface, so that when the filter is unfolded, the large port surface and the inner wall of the blood vessel have a high degree of fit, which reduces the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out from the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter to collect thrombus particles and improving the use effect of the embolic protector. At this time, the oncoming blood flow will flow into the filter, and the blood flow will pass through the filter, and the thrombus particles will be collected in the filter. After collection, the filter will retract into the outer sheath again and be taken out of the human body together with the outer sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A step diagram of a method for weaving a filter screen of the present invention;

[0038] Figure 2 It is a schematic diagram of the metal rod structure of the present invention;

[0039] Figure 3 It is a schematic diagram of the structure of the present invention during closing and winding;

[0040] Figure 4 This is a schematic diagram of the structure of the present invention when the end is closed and wound;

[0041] Figure 5 It is a schematic structural diagram of the embolic protector of the present invention.

[0042] Description of reference numerals:

[0043] 1. Filter; 2. Guide wire; 3. Outer sheath; 4. Development ring; 5. Metal rod; 6. Positioning hole. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the following description, the side of the equipment closer to the operator when in use is referred to as the proximal end, and the side farther from the operator is referred to as the distal end.

[0048] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0049] Example 1

[0050] Reference Figure 1-Figure 5 As shown, the present invention provides a filter screen weaving method, comprising the following steps:

[0051] S1: Weaving: Weaving the base material into a cylindrical mesh structure;

[0052] Among them, the base material is composed of woven wires of shape memory material. The specific material of the woven wires can be set to nickel titanium, titanium alloy, gold cadmium alloy or copper zinc alloy. The filter 1 is made of shape memory material, so that it can better adapt to the inner wall shape of different blood vessels and have better wall adhesion.

[0053] In the weaving step of step S1, the weaver weaves on a stainless steel solid metal rod 5 with an outer diameter of 6 mm, and is woven by 48 ingots of braiding wire in a one-on-one weaving manner. When weaving, 24 ingots of braiding wire form a group, and two groups of braiding wires are woven in opposite directions, and two braiding wires are overlapped together to form an interlacing point. When one of the braiding wires in any group is woven, it is first overlapped on the other group of braiding wires in an S shape, and through the one-on-one method, the radial support force of the woven mesh structure is large, so that it has better wall adhesion. The outer diameter of the braiding wire is set to 0.04 mm.

[0054] Specifically, taking one of the braided wires as an example, the so-called one-on-one means that when one end of the braided wire is woven toward another group of 24-nail braided wires, the braided wire is overlapped with another group of 24-spindle braided wires. When overlapping, the two interlacing points are connected, the part of the braided wire at one of the interlacing points contacts the metal rod, and the part of the braided wire at the other interlacing point contacts the part of the other end of the braided wire facing away from the metal rod, thereby completing the weaving of the braided wire.

[0055] In an optional embodiment, an S-shaped winding arrangement may be used to achieve weaving into a cylindrical mesh structure.

[0056] A positioning hole 6 with a length of 2 mm and a diameter of 0.3 mm is provided around the circumference of the metal rod 5 at a distance of 80 mm from the head thereof. The positioning structure is arranged in the positioning hole 6. The angle between the plane where the plurality of positioning holes 6 are located and the axial direction of the metal rod 5 is set to be 20 to 80 degrees, so that the angle between the plane where the positioning structure is located and the axial direction of the mesh structure is also 20 to 80 degrees. Since there is an angle between the plane where the positioning structure is located and the mesh structure, when the mesh structure is woven and the large port surface is closed, the angle between the large port surface and the axial direction of the mesh structure is also consistent with the angle of the positioning structure due to the setting of the angle of the positioning structure. Since the angle between the large port surface of the filter 1 and the axial direction of the filter 1 is set to be 20 to 80 degrees, the large port surface of the filter 1 is easier to pass through curved blood vessels. At the same time, the oblique large port surface is larger than the vertical area, so that the ability to capture thrombus is stronger, thereby improving the ability of the filter 1 to collect thrombus particles and improving the use effect of the embolic protector.

[0057] Specifically, the angle between the plane where the multiple positioning holes 6 are located and the axial direction of the metal rod 5 is set to 45 degrees, so that the angle between the plane where the positioning structure is located and the axial direction of the mesh structure is also 45 degrees, so that the area of ​​the large port surface is maximized, thereby maximizing the ability to capture thrombus, further improving the ability of the filter 1 to collect thrombus particles, and improving the use effect of the embolic protector.

[0058] S2: Closing: Closing the ends of the mesh structure, winding the two interlaced wires at each interlacing point at the ends of the mesh structure around the positioning piece of the positioning structure in directions away from each other, until the two interlaced wires at the same interlacing point are interlaced with each other.

[0059] In the closing step of S2, the end of the mesh structure is closed in an elliptical shape, and the interwoven wires are wound in an S shape on the positioning piece of the positioning structure. Through the above-mentioned S-shaped winding on the positioning piece of the positioning structure, during the winding process, after the two interwoven wires at one interwoven point are wound, the two interwoven wires are not easy to disperse from the positioning piece of the positioning structure, thereby making it convenient for the staff to untie the two interwoven wires at the next interwoven point and then wind the two newly generated interwoven wires on the positioning piece of the positioning structure.

[0060] Specifically in this embodiment, the positioning structure includes a plurality of positioning holes 6 arranged on the metal rod, and the positioning member is 24 positioning rods, and the outer diameter of the positioning rod is 0.3 mm. Specifically, in this embodiment, 24 positioning holes 6 are provided, B1, B2, ... B23 and B24, and the positioning holes are used to insert the positioning rods. Correspondingly, there are 24 positioning rods, which are C1, C2 ... C23 and C24 in sequence, among which C1 is plugged into B1, C2 is plugged into B2 ... C23 is plugged into B23, and C24 is plugged into B24.

[0061] A plurality of positioning rods are arranged around the periphery of the mesh structure. After the mesh structure is woven on the metal rod 5, when the large port surface is closed, the woven mesh at the end where the positioning hole 6 is 80 mm long from the head of the metal rod 5 is untied. When untied, the two interwoven wires that appear at the interwoven points of the woven mesh are respectively wound half a circle on the plurality of positioning rods in opposite directions, so that the two interwoven wires untied at the interwoven points meet again at their ends after being wound. After all the interwoven points of a circle of the large port surface are untied and wound on the positioning rods, the interwoven wires stacked on each other are fixed by hemostatic forceps for shaping.

[0062] like Figure 3 and 4 As shown, take one of the intersection points as an example:

[0063] Two interlaced threads, A11 and A12, begin to appear at the interlacing point A1. A11 winds clockwise from C1 toward B2 and B3, and A12 winds counterclockwise from B1 toward B24 and B23.

[0064] When A11 is wound, A11 is first wound on C2 in the distal direction of B2, and then A11 is wound on C3 in the proximal direction of B3... A11 is wound on C11 in the distal direction of B11, and finally A11 is wound on C12 in the distal direction of B12.

[0065] When A12 is wound, A12 is first wound on C24 in the distal direction of B24, and then A12 is wound on C23 in the proximal direction of B23...A12 is wound on C13 in the distal direction of B13, and finally A12 is wound on C12 in the distal direction of B12.

[0066] Then, A11 and A12 are intertwined at the distal side of C12, and the overlapping part of the two intertwined wires is fixed by a hemostatic forceps, and the winding method of the other 23 intertwining points is consistent with this intertwining point until the intertwined wires at all the intertwining points are wound around the positioning rod.

[0067] S3: shaping: heat-setting and fixing the mesh structure;

[0068] In the shaping step of S3, after the mesh structure is woven and the two interwoven wires separated by the untied interwoven points are wrapped around the large port surface on the positioning rod, the interwoven wires stacked on each other are fixed with hemostatic forceps, and the filter 1 is sent into the heat setting machine as a whole to heat-set the large port surfaces stacked on each other of the mesh structure, so that the interwoven wires stacked on each other are fixed and will not spread out. The interwoven wires stacked on each other provide greater radial supporting force, so that after the filter 1 enters the blood vessel, the large port closing edge and the blood vessel wall are closely fitted after the filter 1 is unfolded, thereby improving the collection capacity of thrombus particles and improving the use effect of the embolic protector.

[0069] S4: Removal: removing the positioning member from the end of the mesh structure.

[0070] The filter mesh weaving method provided in the present embodiment, during weaving, two groups of base materials are weaved in opposite directions by a one-on-one weaving method, and the base materials are woven into a cylindrical mesh structure. At this time, one end of the mesh structure is defined as the large port surface, and the woven base material at the large port surface is untied. At this time, when each interweaving point of the mesh structure is untied, two interweaving lines will appear. At this time, the interweaving lines of the two interweaving lines are wound around the positioning piece of the positioning structure in directions away from each other, until a circle of the large port surface is untied and wound around the positioning piece of the positioning structure, completing the closing of the large port surface, so that the large port surface of the filter mesh 1 is formed, and then the entire filter mesh 1 is fixed. During the weaving process of the filter mesh 1, the closing of the large port surface is achieved by untying a circle of the large port surface. The two interwoven wires of the substrate are wound around the positioning piece in opposite directions, so that the interwoven wires untied at the interwoven points of a circle of the mesh structure are stacked and wound together. At this time, a large port surface is formed by the stacked substrate interwoven wires, and the stacked substrate interwoven wires provide support force, thereby improving the radial support force of the large port surface. When the filter 1 is delivered into the blood vessel, due to the improved radial support force of the large port surface, the large port surface and the inner wall of the blood vessel are closely fitted when the filter 1 is unfolded, which reduces the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out from the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter 1 to collect thrombus particles and improving the use effect of the embolic protector.

[0071] Example 2

[0072] like Figure 1-Figure 5 As shown, the present invention provides an embolic protector, including a filter 1 made by the above-mentioned filter weaving method, with developing rings 4 provided on both ends of the filter 1, and also including a guide wire 2 and an outer sheath 3. The filter 1 is connected to the distal end of the guide wire 2, suitable for pushing the filter 1 away from the outer sheath 3 and releasing it to fit with the blood vessel wall; the filter 1 and the guide wire 2 are inserted into the outer sheath 3.

[0073] When in use, the woven filter 1 is contracted in the outer sheath 3. During surgery, the outer tube together with the filter 1 is inserted into a blood vessel in the human body where a thrombus exists. After being pushed to the downstream of the surgical site, the guide wire 2 is pushed to withdraw the filter 1 from the outer sheath 3. At this time, after the filter 1 leaves the constraint of the outer sheath 3, due to the shape memory of the woven base material, the filter 1 will automatically return to its original funnel shape. At this time, the large port of the filter 1 will be close to the inner wall of the blood vessel. Since the large port is closed by stacking the base material interweaving lines together to form a large port surface, the stacked base material interweaving lines provide support. force, thereby improving the radial supporting force of the large port surface, so that when the filter screen 1 is unfolded, the large port surface and the inner wall of the blood vessel have a high fit, which reduces the appearance of gaps between the large port surface and the inner wall of the blood vessel, so that smaller thrombi will not flow out from the gap between the large port surface and the thrombus wall, thereby improving the ability of the filter screen 1 to collect thrombus particles and improving the use effect of the embolic protector. At this time, the oncoming blood flow will flow into the filter screen 1, and the blood flow will pass through the filter screen 1, and the thrombus particles will be collected in the filter screen 1. After collection, the filter screen 1 will retract into the outer sheath tube 3 again and be taken out of the human body together with the outer sheath tube 3.

[0074] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A filter screen weaving method, characterized in that: include: Weaving: Weaving the base material into a cylindrical mesh structure; Closing: Closing the ends of the mesh structure, winding the two interwoven wires of each interwoven point at the end of the mesh structure around the positioning member of the positioning structure in directions away from each other, until the two interwoven wires at the same interwoven point are interwoven with each other; specifically, the two interwoven wires that emerge from the interwoven points of the filter are untied and wound around a plurality of positioning members in opposite directions, so that the two interwoven wires untied from the interwoven points are interwoven again at the ends after being wound, and after all the interwoven points of the large port surface are untied and wound around the positioning members, the interwoven wires stacked together are fixed and shaped; The angle between the plane where the positioning structure is located and the axial direction of the mesh structure is set to 20 degrees to 80 degrees.

2. The filter screen weaving method according to claim 1, characterized in that: In the closing step, the interwoven wires are wound in an S shape on the positioning member of the positioning structure.

3. The filter screen weaving method according to claim 1, characterized in that: The plane where the positioning structure is located is 45 degrees to the axial direction of the mesh structure.

4. The filter screen weaving method according to claim 1, characterized in that: The end of the mesh structure is closed in an elliptical shape, and the positioning piece is a positioning rod.

5. The filter screen weaving method according to any one of claims 1 to 4, characterized in that: After the closing step, the method further comprises: The mesh structure is heat-set and fixed.

6. The filter screen weaving method according to claim 5, characterized in that: After the shaping step, the method further comprises: Removal: removing the positioning structure from the end of the mesh structure.

7. The filter screen weaving method according to claim 1, characterized in that: The substrate is composed of a shape memory material.

8. A filter screen, characterized in that: The filter mesh is made based on the filter mesh weaving method described in any one of claims 1-4 and 6-7.

9. An embolic protector, characterized in that: Comprising the filter screen as claimed in claim 8.

10. The embolic protector according to claim 9, characterized in that: Also includes: A guide wire, wherein the filter is connected to the distal end of the guide wire and is suitable for pushing the filter away from the outer sheath and releasing it to fit with the blood vessel wall; The outer sheath tube is provided with the filter screen and the guide wire passing through the outer sheath tube.

11. The embolic protector according to claim 9, characterized in that: Also includes: The developing ring is arranged at the end of the filter screen.

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