Embolic protection device and medical instrument

Abstract

The application provides an embolism protection device and medical equipment, which comprises a guide wire and an umbrella body sleeved on the guide wire; the guide wire is used for moving the umbrella body; the umbrella body comprises a net bag structure and at least two supporting rods; the net bag structure comprises a main body part and a brim part arranged along the brim of the main body part; the distal ends of the at least two supporting rods are respectively connected with the brim part, and the proximal ends intersect with the guide wire; and the radial tension of the brim part is greater than that of the main body part. The embolism protection device and medical equipment provided by the application can improve the anchoring performance of the umbrella body after being released in a blood vessel by pulling the supporting rods to drive the net bag structure to shrink, so that when the net bag structure enters a target object (such as a blood vessel), the radial tension of the brim part of the net bag structure is greater than that of the main body part.

Description

Technical Field

[0001] This invention relates to the field of medical technology, and in particular to an embolism protection device and medical instrument. Background Technology

[0002] In interventional treatment of vascular stenosis, almost all patients experience the release of thrombogenic substances at the site of the stenosis, which can lead to distal vascular embolism and impaired distal blood flow perfusion. During interventional treatment, lipid fragments, matrix components, endothelial cells, inflammatory cells, platelets, and leukocytes from the plaque can all cause distal vascular embolism, affecting the patient's immediate or long-term prognosis. Distal vascular protection devices are systems that filter thrombi or plaques. Originally used in carotid angioplasty, these devices can capture a large number of plaque fragments and thrombus material, preventing them from blocking distal blood flow and forming microemboli, significantly reducing the incidence of stroke. Distal protection devices are now routinely used in carotid artery interventional treatment.

[0003] Currently, distal embolization protection devices employ umbrella-like manufacturing processes, which include two methods: membrane coating and dense mesh weaving. Membrane coating is typically applied to a coarse mesh framework after the tubing has been cut, resulting in higher processing costs, greater difficulty in the coating process, and unstable membrane conditions. Dense mesh weaving requires manual stitching of the beveled opening, leading to high labor costs due to manual intervention. Furthermore, the eccentric distribution between the woven umbrella body and the push rod results in poor adhesion to the wall, posing a risk of thrombus escape to the distal end. Summary of the Invention

[0004] The purpose of this invention is to provide an embolism protection device and a medical device to solve one or more problems of existing embolism protection devices.

[0005] To solve the above-mentioned technical problems, the present invention provides an embolism protection device, comprising: a guide wire and an umbrella body sleeved on the guide wire, wherein the guide wire is used to drive the umbrella body to move;

[0006] The umbrella body includes a net structure and at least two support rods. The net structure includes a main body and an edge portion disposed along the edge of the main body. The distal ends of the at least two support rods are respectively connected to the edge portion, and the proximal ends intersect the guide wire. The radial tension of the edge portion is greater than the radial tension of the main body.

[0007] Optionally, in the embolism protection device, both the edge portion and the main body portion are braided structures using the same braiding yarn parameters, the braiding density of the edge portion is greater than the braiding density of the main body portion; and / or, the length of the float line of the edge portion is less than the length of the float line of the main body portion.

[0008] Optionally, in the embolism protection device, the edge portion includes multiple sloping edges, each sloping edge being a bundle of filaments formed by a progressively increasing number of braiding filaments participating in the weaving along a reverse interlacing direction, the reverse interlacing direction being the direction from the connection point of each sloping edge to the connection point with the support rod.

[0009] Optionally, in the embolism protection device, the number of braided filaments participating in the weaving along the reverse interlacing direction of each slope edge is increased by a step of 1, with each braided mesh as a unit.

[0010] Optionally, in the embolism protection device, the net structure and the support rod are integrally woven using polymer material filaments or metal wires.

[0011] Optionally, in the embolism protection device, the main body is a braided structure, and the edge portion and the support rod are made of a cut and shaped metal skeleton structure.

[0012] Optionally, in the embolism protection device, the proximal end of the braided structure is connected to the edge portion using a back-knitted structure.

[0013] Optionally, in the embolism protection device, each pair of adjacent support rods connects with the edge portion to form a bevel, and the number of bevels is at least two. The at least two bevels are evenly distributed circumferentially, so that the net structure is coaxially arranged with the guide wire.

[0014] Optionally, in the embolism protection device, the support rod includes a primary support rod and a secondary support rod. There are multiple primary support rods, which intersect at their proximal ends in a combined manner and connect with one of the secondary support rods. The proximal ends of all the secondary support rods intersect the guidewire.

[0015] Optionally, in the embolism protection device, the embolism protection device further includes two connectors, which are movably sleeved on the guide wire. The two ends of the umbrella body are respectively fixed to one of the connectors and move with the movement of the connectors.

[0016] The present invention also provides a medical device, comprising:

[0017] The embolism protection device as described in the preceding item; and,

[0018] The catheter, wherein the guidewire is used to retract the umbrella body into the catheter or to extend the umbrella body out of the catheter; when the umbrella body is retracted into the catheter, the umbrella body is in a retracted state, and when the umbrella body is extended out of the catheter, the umbrella body is in an open state.

[0019] In summary, the embolism protection device and medical device provided by the present invention include: a guidewire and an umbrella body sleeved on the guidewire, the guidewire being used to move the umbrella body; the umbrella body includes a net structure and at least two support rods, the net structure including a main body and an edge portion disposed along the edge of the main body, the distal ends of at least two of the support rods being respectively connected to the edge portion, the proximal ends intersecting the guidewire, and the radial tension of the edge portion being greater than the radial tension of the main body.

[0020] Compared with the prior art, the embolism protection device and medical device provided by the present invention have the following beneficial effects:

[0021] (1) The radial tension of the edge portion of the net structure is greater than that of the main body portion, which can improve the anchoring performance of the umbrella after it is released into the blood vessel and reduce the possibility of thrombus escaping between the umbrella and the blood vessel wall.

[0022] (2) Furthermore, the net structure is coaxially arranged with the guide wire, so that the coarse mesh skeleton has good wall adhesion throughout the entire circumference, 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.

[0023] (3) Furthermore, the woven part of the mesh structure and the edge part with the metal skeleton structure are connected by a back-knitting structure, which has good uniformity and does not require manual sewing of the bevel, thus improving processing efficiency. Attached Figure Description

[0024] Figure 1a and Figure 1b Schematic diagrams of the embolism protection device provided in Embodiments 1 and 2 of the present invention from different perspectives;

[0025] Figure 2 This is a schematic diagram of the structure of the embolism protection device provided in Embodiments 1 and 2 of the present invention when it includes four support rods;

[0026] Figure 3 This is a schematic diagram showing that the weaving density of the edge portion is greater than that of the main body portion in Embodiment 1 of the present invention;

[0027] Figures 4a-4c These are schematic diagrams of different cross-sections of the support rod exemplified in Embodiment 1 of the present invention;

[0028] Figure 5 This is a schematic diagram of the braiding structure in an embodiment of the present invention;

[0029] Figure 6a and 6b This is a schematic diagram of the slope edge shape of the edge portion in an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram showing the arrangement relationship between the protrusion and the two connecting members in an embodiment of the invention;

[0031] Figure 8a and Figure 8b This is a schematic diagram of the developing wire being disposed at the edge portion in an embodiment of the present invention;

[0032] Figure 9a and Figure 9b This is a schematic diagram showing the distribution of the developing filaments throughout the umbrella body in an embodiment of the present invention;

[0033] Figures 10a-10d This is a schematic diagram illustrating different connection methods between the braided structure and the edge portion in Embodiment 2 of the present invention;

[0034] Figure 11 This is a schematic diagram of the embolism protection device provided in Embodiment 3 of the present invention;

[0035] The labels in the attached figures are explained as follows:

[0036] 1-Guidewire; 2-Umbrella body; 3-Connector

[0037] 11-Protrusion;

[0038] 21- Mesh structure; 22- Support rod;

[0039] 31 - Proximal connector; 32 - Distal connector;

[0040] 100 - Edge portion; 200 - Developer wire; 300 - Main body portion

[0041] 221 - Primary support rod; 222 - Secondary support rod. Detailed Implementation

[0042] The embolization protection device and medical device proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of this invention. Furthermore, the structures shown in the drawings are often part of the actual structure. In particular, different proportions may be used in different drawings to show different emphases. It should also be understood that, unless specifically stated or indicated, the terms "first," "second," "third," etc., in the specification are only used to distinguish the various components, elements, steps, etc., in the specification, and are not used to indicate the logical or sequential relationships between the various components, elements, steps, etc.

[0043] In this application, "proximal" and "distal" refer to the relative orientation, position, and direction of the components or movements relative to each other from the perspective of the physician using the medical device. Although "proximal" and "distal" are not restrictive, "proximal" usually refers to the end of the medical device that is closer to the physician during normal operation, while "distal" usually refers to the end that first enters the patient's body.

[0044] Example 1

[0045] Please see Figure 1a and 1b This embodiment provides an embolism protection device, including: a guide wire 1 and an umbrella body 2 sleeved on the guide wire 1; the guide wire 1 is used to drive the umbrella body 2 to move, the umbrella body 2 includes a net structure 21 and at least two support rods 22, the net structure 21 includes a main body portion 300 and an edge portion 100 provided along the edge of the main body portion 300, the distal ends of the at least two support rods 22 are respectively connected to the edge portion 100 of the net structure 21, and the proximal ends intersect the guide wire 1, the radial tension of the edge portion 100 is greater than the radial tension of the main body portion 300.

[0046] The embolism protection device provided in this embodiment can improve the anchoring performance of the umbrella body after it is released into the blood vessel because the radial tension of the edge portion 100 of the net structure 21 is greater than the radial tension of the main body portion 300. Therefore, even without the use of a coarse mesh skeleton after cutting the tubing for anchoring, it can reduce the possibility of thrombus escaping between the umbrella body 2 and the blood vessel wall to a certain extent.

[0047] In this embodiment, the net structure 21 is a woven structure, and the radial tension of the edge portion 100 of the woven structure is greater than the radial tension of the rest portion can be achieved by one or two of the following methods:

[0048] (1) The edge portion 100 of the net structure 21 and the main body portion 300 of the net structure 21 use the same weaving yarn parameters (such as the same weaving yarn diameter, material, etc.), but the weaving density of the edge portion 100 is greater than the weaving density of the main body portion 300.

[0049] In this embodiment, the edge portion 100 includes multiple sloping edges, optionally, such as... Figure 3As shown, each of the slope edges is a bundle of yarns formed by a gradual increase in the number of yarns participating in the weaving along the reverse interlacing direction. The reverse interlacing direction is the direction from the connection point of each slope edge to the connection point with the support rod. Specifically, after the net structure 21 is woven, when weaving each slope edge, the number of yarn ends does not increase or decrease. Only when each weaving mesh is changed, the weaving path of the yarns in the direction perpendicular to the reverse interlacing direction is changed to interlacing along the reverse interlacing direction, so that the closer to the support rod, the more yarns participate in the weaving along the reverse interlacing direction. Thus, the final form of the edge portion 100 is as follows: taking the woven mesh of the net structure 21 as a unit, the number of weaving threads participating in the weaving along the reverse interlacing direction gradually increases, forming each of the sloping edges distributed in a stepped manner; preferably, for each change in the woven mesh, the number of weaving threads participating in the weaving along the reverse interlacing direction increases by one, that is, taking the woven network of the net structure 21 as a unit, the number of weaving threads participating in the weaving along the reverse interlacing direction increases by a step size of 1. Multiple weaving threads along the reverse interlacing direction are parallel to each other in a naturally flattened state.

[0050] (2) The length of the float line of the edge portion 100 is less than the length of the float line of the main body portion 300 (e.g., the length of the float line of the 1-press 1 braided structure is less than the length of the float line of the 1-press 2 braided structure).

[0051] The net structure 21 can be integrally formed. During the integral forming process, the weaving density of the edge part 100 can be greater than that of the main body part 300 in the following ways: (1) without changing the arrangement order of the yarn spindles in the weaving machine, increase the weaving angle (the angle between the yarn and the axis) during the weaving process; (2) change the arrangement of the yarn spindles in the weaving machine, reduce the arrangement distance of the yarn spindles moving in the same direction, and make them compactly arranged and move with the weaving machine.

[0052] Alternatively, after weaving, the edge portion 100 of the umbrella body 2 can be stacked and fixed using a mold and then heat-treated to form a shape, so that the weaving density of the edge portion 100 is greater than that of the main body portion 300. The net structure 21 can be integrally woven using metal wires, or integrally woven using polymer material weaving yarns. In some other embodiments, although both the edge portion 100 and the main body portion 300 of the net structure 21 may be woven, they are not integrally woven but rather spliced ​​together. In this case, in addition to changing the weaving density and float length as described above, the edge portion 100 can be formed using coarse yarns and the main body portion 300 can be formed using fine yarns, and / or the edge portion 100 can be formed using metal wires and the main body portion 300 can be formed using polymer material weaving yarns, so that the radial tension of the edge portion 100 is greater than that of the main body portion 300. In summary, regardless of the weaving method of the net structure 21, it is sufficient that the radial tension of the edge portion 100 is greater than the radial tension of the main body portion 300 after forming.

[0053] Furthermore, the support rod 22 can also be integrally woven with the net structure 21, with each support rod 22 woven using multiple braided threads, such as... Figures 4a-4c As shown, its cross-section can be flat, circular, or triangular, etc., and a suitable cross-sectional shape can be formulated according to the requirements of the breaking strength and compressive volume of the support rod 22. At the distal end of each support rod 22, multiple braided threads branch out in different directions, so that the net structure 21 can be woven into a plain weave or a variation of the plain weave using braided threads in different directions, for example, as... Figure 5 As shown, a plain weave structure or a twisted structure, such as 1-press-1, 1-press-2, 1-press-3, 2-press-2, and 2-press-3, is formed. When the support rod 22 and the net structure 21 are integrally woven, considering the requirements for the support strength of the support rod 22, it is preferable to use metal wire rather than polymer material weaving yarn to form the support rod 22 and the net structure 21. Of course, in this embodiment, the support rod 22 can also be a cut-and-formed metal skeleton structure.

[0054] The edge portion 100 includes at least two sloping edges, the sloping edges being, for example, as shown in... Figure 6a The V-shape shown, as Figure 6bThe U-shaped or straight shape shown is formed by connecting two adjacent support rods 22 to the two ends of a slope to form a slope opening. The number of slope openings is at least two, such as 2, 3, 4, 5, etc. When at least two slope openings are evenly distributed along the circumference, the net structure 21 can be coaxially and non-eccentrically distributed with the guide wire 1 when it is fitted onto the guide wire 1. Therefore, the entire circumference has good wall adhesion and can prevent thrombi from escaping through the gap between the embolization protection device and the blood vessel wall in multiple directions.

[0055] For example, such as Figure 1a As shown, the edge portion 100 includes two V-shaped ramp edges connected sequentially around the circumference, and two support rods are respectively connected to the apex angles of the two V-shaped ramp edges, forming two ramp structures symmetrical about the guide wire; as Figure 2 As shown, the edge portion 100 includes four V-shaped ramp edges connected in sequence around the circumference, and four support rods are respectively connected to the apex corners of the four V-shaped ramp edges to form four ramp structures that are symmetrical about the guide wire.

[0056] In addition, the embolism protection device also includes two connectors 3, namely a proximal connector 31 and a distal connector 32. The proximal connector 31 and the distal connector 32 are movably sleeved on the guidewire 1. The two ends of the umbrella body 2 are respectively fixed to the proximal connector 31 and the distal connector 32, and move with the movement of the proximal connector 31 and the distal connector 32. The guidewire 1 can rotate freely circumferentially relative to the proximal connector 31 and the distal connector 32, and slide axially. Specifically, as... Figure 7 As shown, the guide wire 1 may have a protrusion 11 located between the proximal connector 31 and the distal connector 32. When the guide wire 1 moves proximally until the protrusion 11 abuts against the proximal connector 31, it causes the proximal connector 31 to move closer to the proximal end, thereby moving the entire net structure closer to the proximal end. Similarly, when the guide wire 1 moves distally until the protrusion 11 abuts against the distal connector 32, it causes the distal connector 32 to move further distally, thereby moving the entire net structure further distally. (Protrusion 11)

[0057] The connector 3 can be a radiopaque material to facilitate the doctor's intraoperative judgment and operation. In addition, the braided yarn of the umbrella body 2 can also be radiopaque yarn in whole or in part, which can also achieve the purpose of facilitating the doctor's intraoperative judgment and operation.

[0058] For example, such as Figure 8a and 8b As shown, the imaging filament 200 can be distributed only on the edge portion 100, reflecting the adhesion state at the maximum outer diameter of the umbrella body 2 in real time during the operation. Specifically, it can directly participate in the weaving and shaping or be fixed to the edge portion 100; or, as... Figure 9a and 9bAs shown, the developing filaments 200 can be distributed both along the edge portion 100 and in other parts. Specifically, the number of developing filaments is ≥4, with at least 4 developing filaments participating in the weaving of the entire umbrella body 2, thus enabling the umbrella body to have the function of full-body developing. The participation of the developing filaments 200 in the weaving also avoids manual operation and saves labor time. The developing filaments mentioned here can be used for full-body developing, developing only the inner core, or forming a spring-like structure after being wound around a spring.

[0059] This embodiment also provides a medical device, including:

[0060] The embolism protection device as provided in this embodiment; and,

[0061] The guidewire 1 is used to retract the umbrella body 2 into the guidewire or to extend the umbrella body 2 out of the guidewire; when the umbrella body 2 is retracted into the guidewire, the umbrella body 2 is in a retracted state, and when the umbrella body 2 is extended out of the outer sheath, the umbrella body 2 is in an open state.

[0062] Specifically, during delivery, the umbrella-shaped body 2 of the embolization protection device retracts into the catheter. When the umbrella-shaped body 2 reaches the target position, such as the aortic arch, the guidewire 12 pushes the umbrella-shaped body 2 out of the catheter, causing it to expand and open into an umbrella shape. After the procedure is completed, the guidewire 12 is withdrawn, and the umbrella-shaped body 2 is retracted into the catheter again, thus being withdrawn.

[0063]

Example 2

[0064] Unlike Embodiment 1, in this embodiment, the main body 300 has a woven structure, such as the plain weave structure or twisted structure of 1-press-1, 1-press-2, 1-press-3, 2-press-2, 2-press-3 as described in Embodiment 1. The woven yarn can be metal wire or polymer material yarn. The edge portion 100 and the support rod 22 adopt a cut metal skeleton structure. That is, compared with the woven structure in Embodiment 1, the edge portion 100 in this embodiment adopts a metal skeleton structure.

[0065] The metal frame structure and the support rod 22 can be integrally cut and formed, or the metal frame structure and the support rod 22 can be cut and formed separately and then connected by welding or other methods.

[0066] Preferably, the metal skeleton structure is made of a metal radiopaque material, or both the metal skeleton structure and the support rod 22 are made of a metal radiopaque material, which can also reflect the wall adhesion status at the maximum outer diameter of the umbrella body 2 in real time during the operation.

[0067] Furthermore, preferably, the proximal end of the main body portion 100 is connected to the edge portion 100 using a back-knitted structure. The connection between the main body portion 100 and the edge portion 100, which employs a metal skeleton structure, via the back-knitted structure results in good uniformity and eliminates the need for manual beveling, thus improving processing efficiency.

[0068] The woven structure and the edge portion 100 (referred to as the skeleton in the following description of the connection method) can be connected in, but is not limited to, the following ways:

[0069] (1) As Figure 10a As shown, holes are made in the skeleton, and some of the braided wires are folded back through the holes to form a woven mesh structure with the remaining braided wires;

[0070] (2) Figure 10b As shown, there are no holes in the skeleton, and some of the braided wires cross the skeleton and then fold back to form a woven mesh structure with the remaining braided wires;

[0071] (3) Figure 10c As shown, multiple fixing rings are connected to the skeleton, and some of the braided wires pass through the fixing rings and fold back to form a woven mesh structure with the remaining braided wires;

[0072] (4) Figure 10d As shown, the braided wires and the skeleton are bonded together using adhesives such as glue, or the braided wires and the skeleton are welded together using dissimilar or homogeneous metals.

[0073]

Example 3

[0074] In this embodiment, as Figure 11 As shown, the support rod 22 includes primary support rods 221 and secondary support rods 222. There are multiple primary support rods 221, meaning the number of primary support rods 221 is greater than two. These primary support rods 221 intersect proximally in a combined configuration and connect to one of the secondary support rods 222. The proximities of all the secondary support rods 222 intersect the guide wire. For example, the proximities of all the secondary support rods 222 are fixed to the connector 3 located proximally. That is, the number of secondary support rods 222 is less than the number of primary support rods 221.

[0075] When the anti-thrombotic protective device is located inside a blood vessel, thrombi can easily accumulate on the surface of the support rod. In this embodiment, the support rod 22 adopts a design of primary support rod 221 and secondary support rod 222. After entering the blood vessel, when the fewer secondary support rods 222 are suspended in the blood vessel, the more numerous primary support rods 221 can be close to the blood vessel. When the support rod is close to the blood vessel, thrombi will not accumulate. Therefore, compared with Embodiment 1 and Embodiment 2, the number of support rods that can accumulate thrombi can be reduced, thereby reducing the probability of thrombi accumulating on the support rod of the protective device.

[0076] like Figure 11The example shown illustrates an umbrella body comprising four primary support rods 221, with each pair of primary support rods 221 intersecting at their proximal ends and connecting to a secondary support rod 222. It should be understood that the number of primary support rods 221 can also be 3, 5, 6, etc. When the number of primary support rods 221 is odd, the proximal ends of an odd number of primary support rods 221 can be connected to a secondary support rod 222, or one of the primary support rods 221 can be connected to a secondary support rod 222 independently, without connecting to the proximal ends of the other primary support rods 221.

[0077] Specifically, the secondary support 222 can be formed by multiple primary support rods 221 intersecting and merging at their proximal ends in a combined manner. The merging methods include, but are not limited to, the following:

[0078] (1) Simple merging: The yarns of the merged unit support rods are not intertwined with each other. They can be connected by components such as developing rings and non-developing rings, or by adhesives such as glue.

[0079] (2) By merging the braided structure, the yarns of each support rod can interweave with each other to form a new braided body. The number of yarns in this braided body is the sum of the number of yarns of each of the merged support rods.

[0080] (3) Formed by self-twisting cable winding and merging, with all yarns rotating and winding in one direction;

[0081] (4) The yarn is divided into n groups, and each component is interwoven in a braided manner;

[0082] (5) The braided wires of each support rod are connected by welding.

[0083] In summary, the embolism protection device and medical device provided by the present invention include: a guidewire and an umbrella body sleeved on the guidewire, the guidewire being used to move the umbrella body; the umbrella body includes a net structure and at least two support rods, the net structure including a main body and an edge portion disposed along the edge of the main body, the distal ends of the at least two support rods being respectively connected to the edge portion, and the proximal ends intersecting the guidewire, the radial tension of the edge portion being greater than the radial tension of the main body. The embolism protection device and medical device provided by the present invention, by pulling the support rods to cause the net structure to contract, so that when the net structure enters the target object (such as a blood vessel), because the radial tension of the edge portion of the net structure is greater than the radial tension of the main body, the anchoring performance of the umbrella body after release within the blood vessel can be improved. Therefore, even without a coarse mesh skeleton after tubing cutting for anchoring, the possibility of thrombus escaping between the umbrella body and the blood vessel wall can be reduced to a certain extent.

[0084] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. In addition, different parts between embodiments can also be combined with each other, and this invention does not limit this.

[0085] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. An embolism protection device, characterized in that, include: A guide wire and an umbrella body sleeved on the guide wire, wherein the guide wire is used to drive the umbrella body to move; The umbrella body includes a net structure and at least two support rods. The net structure includes a main body and an edge portion disposed along the edge of the main body. The distal ends of the at least two support rods are respectively connected to the edge portion, and the proximal ends intersect the guide wire. The radial tension of the edge portion is greater than the radial tension of the main body. Both the edge portion and the main body portion are woven structures using the same weaving yarn parameters. The weaving density of the edge portion is greater than that of the main body portion. The edge portion includes multiple sloping edges, each sloping edge being a yarn bundle formed by a gradual increase in the number of yarns participating in the weaving along the reverse interlacing direction. The reverse interlacing direction is the direction from the connection point of each sloping edge to the connection point with the support rod. After the net structure is woven, when weaving each sloping edge, the number of yarn ends does not increase or decrease. Only when each weaving mesh is changed, the weaving path of the yarns in the direction perpendicular to the reverse interlacing direction is changed to interlacing along the reverse interlacing direction, so that the closer to the support rod, the more yarns participate in the weaving along the reverse interlacing direction.

2. The embolism protection device as described in claim 1, characterized in that, The length of the float line on the edge portion is less than the length of the float line on the main body portion.

3. The embolism protection device as described in claim 1, characterized in that, Each slope edge is woven in units of a mesh, with the number of weaving threads participating in the weaving along the reverse interlacing direction increasing by a step of 1.

4. The embolism protection device as described in claim 1, characterized in that, The net structure and the support rod are integrally woven using polymer material filaments or metal wires.

5. The embolism protection device as described in claim 1, characterized in that, Each pair of adjacent support rods connects with the edge portion to form a bevel, and there are at least two bevels. The at least two bevels are evenly distributed circumferentially, so that the net structure and the guide wire are coaxially arranged.

6. The embolism protection device as described in claim 1, characterized in that, The support rod includes a primary support rod and a secondary support rod. There are multiple primary support rods, which intersect at their proximal ends in a combined manner and connect with one of the secondary support rods. The proximal ends of all the secondary support rods intersect the guide wire.

7. The embolism protection device as described in claim 1, characterized in that, The embolism protection device also includes two connectors, which are movably sleeved on the guide wire. The two ends of the umbrella body are respectively fixed to one of the connectors and move with the movement of the connectors.

8. A medical device, characterized in that, include: The embolism protection device as described in any one of claims 1 to 7; as well as, The catheter, wherein the guidewire is used to retract the umbrella body into the catheter or to extend the umbrella body out of the catheter; when the umbrella body is retracted into the catheter, the umbrella body is in a retracted state, and when the umbrella body is extended out of the catheter, the umbrella body is in an open state.

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