Far-end embolism protector

Abstract

The utility model provides a far-end embolism protector, and relates to the technical field of interventional medical instruments. The protection assembly is arranged on the conveying guide wire and located at the far end of the conveying guide wire; the protection assembly comprises a first protection umbrella and a second protection umbrella which are sequentially arranged from the near end to the far end of the conveying guide wire. The first protection umbrella and the second protection umbrella each comprise a weaving part with the far end connected to the conveying guide wire and a fixing part with the near end connected to the conveying guide wire and the far end connected with the weaving part, and the weaving part is of a woven dense net structure. By arranging the first protection umbrella and the second protection umbrella, the contact area between the two protection umbrellas and blood vessels is increased, and therefore the stability of the first protection umbrella and the second protection umbrella during working is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of interventional medical instruments, and particularly relates to a distal embolism protector. BACKGROUND

[0002] In a neurointerventional procedure, after the thrombus-removal stent is expanded and captures the thrombus, the thrombus-removal stent and the thrombus are squeezed together during the process of being collected into the guide catheter, which may cause the thrombus to break and small thrombi to fall off and move distally through the blood vessels into the brain or blood vessels of other important organs, causing embolism and, in severe cases, ischemic necrosis of the brain or other important parts.

[0003] Therefore, in a neurointerventional procedure, the protection umbrella plays an important role. The protection umbrella is usually composed of a delivery guide wire and a filter screen. The delivery guide wire is used to guide the protection umbrella to the target blood vessel position, and the filter screen is used to capture the emboli that may fall off. The filter screen of the protection umbrella is generally made of special material and has fine pores, which can effectively prevent emboli from passing through while allowing normal blood flow. In the prior art, the protection umbrella is placed at the distal end of the thrombus site to prevent broken emboli generated during the operation from entering the blood vessels of the brain or other important organs after falling off, thereby reducing the risk of the operation.

[0004] Although the protection umbrella can capture emboli of a certain size, the protection umbrella itself is difficult to fix in the blood vessel, mainly because the protection umbrella is umbrella-shaped and has a small contact area with the inner wall of the blood vessel, which easily causes sliding, increases the risk of operation failure, and may cause blood vessel injury.

[0005] Therefore, it is necessary to provide a protection umbrella stent with stronger emboli capturing ability. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a distal embolism protector to solve the problem of insufficient emboli capturing ability of the existing protection umbrella stent.

[0007] In order to achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] A distal embolism protector, comprising a delivery guide wire;

[0009] A protection assembly is arranged on the delivery guide wire and located at the distal end of the delivery guide wire;

[0010] The protection assembly comprises a first protection umbrella and a second protection umbrella arranged in sequence from the proximal end to the distal end of the delivery guide wire.

[0011] The first protection umbrella and the first protection umbrella each comprise a braided part connected to the delivery guide wire at the distal end, and a fixed part connected to the delivery guide wire at the proximal end and connected to the braided part at the distal end, and the braided part is a braided dense mesh structure.

[0012] Preferably, the connection member comprises a telescopic connection member, two ends of the telescopic connection member are fixedly connected to the outer circumferential surface of the first umbrella and the second umbrella respectively, the distal end of the telescopic connection member changes in radial dimension with the change of the radial dimension of the second umbrella, and the proximal end of the telescopic connection member changes in radial dimension with the change of the radial dimension of the first umbrella.

[0013] Preferably, the mesh size of the first umbrella weaving part is larger than the mesh size of the second umbrella weaving part.

[0014] Preferably, the connection member comprises a film, the distal end of the film is connected to the connection part of the weaving part and the fixed part of the second umbrella, and the proximal end of the film is connected to the connection part of the weaving part and the fixed part of the first umbrella.

[0015] Preferably, the film is a PTFE film, an ePTFE film or a PET film.

[0016] Preferably, the connection member comprises a telescopic connection net, the distal end of the telescopic connection net is connected to the connection part of the weaving part and the fixed part of the second umbrella, and the proximal end of the telescopic connection net is connected to the connection part of the weaving part and the fixed part of the first umbrella.

[0017] Preferably, the telescopic connection net is a component made of a nickel-titanium alloy wire.

[0018] Preferably, the telescopic connection net comprises a nickel-titanium alloy wire which is woven in a horizontal and vertical staggered manner, and in the expanded state, the longitudinal nickel-titanium alloy wire is attached to the inner wall of the blood vessel in the longitudinal section of the blood vessel.

[0019] Preferably, a plurality of developing points are arranged on the delivery guide wire, the first umbrella, the second umbrella and the connection member.

[0020] Preferably, the delivery guide wire is one of a polymer tube, a braided tube, a coil tube and a metal tube.

[0021] Beneficial effects:

[0022] (1) The first umbrella and the second umbrella are arranged, and the two umbrellas increase the contact area with the blood vessel, thereby enhancing the stability of the first umbrella and the second umbrella during work.

[0023] (2) The connection member is arranged, the connection member connects the first umbrella and the second umbrella, and expands to abut against the inner wall of the blood vessel, thereby increasing the contact area with the inner wall of the blood vessel, increasing the frictional resistance, and improving the stability of the first umbrella and the second umbrella.

[0024] (3) The first protective umbrella and the second protective umbrella, even if the first protective umbrella fails to capture all the emboli, the emboli passing through the first protective umbrella will be captured by the second protective umbrella weaving part of the mesh opening, forming double capture, and the capture capacity for emboli is strengthened;

[0025] (4) The utility model discloses a connecting piece is arranged, after the connecting piece is self -inflated and is contacted with the inner wall of blood vessel, the connecting piece can limit thrombus in the radial direction of blood vessel, reduces the escape of thrombus in the radial direction. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The embodiments of the present application and its contents are used to explain the present application, and do not constitute an improper limitation on the present application. Among them:

[0027] Figure 1 It is a main view structural schematic drawing for showing the coaxial protective umbrella of the embodiment one of the application.

[0028] Figure 2 It is a main view structural schematic drawing for showing the conical protective umbrella of the embodiment one of the application.

[0029] Figure 3 It is a main view structural schematic drawing of the embodiment two of the application.

[0030] Figure 4 It is a main view structural schematic drawing of the embodiment three of the application.

[0031] Figure 5 It is a main view structural schematic drawing of the embodiment three of the application.

[0032] Figure 6 It is a main view structural schematic drawing of the first protective umbrella and the second protective umbrella in the embodiment of the application.

[0033] In the drawing: 1, delivery guide wire; 3a, first protective umbrella; 3b, second protective umbrella; 31, weaving part; 32, fixed part; 4, developing point; 5, connecting piece; 51, film covering; 52, telescopic connecting net. DETAILED DESCRIPTION

[0034] The technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0035] In the description of the utility model, it needs to be understood that, if the direction description, for example, the direction or position relation of the indication such as upper, lower, front, back, left, right is based on the direction or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as the limitation of the utility model.

[0036] In the description of the utility model, the meaning of several is one or more, and the meaning of multiple is more than two, greater than, less than, more than and the like are not included in the number, and above, below, within and the like are included in the number.

[0037] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features.

[0038] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, the term "connection" should be understood broadly, for example, it can be fixed connection or movable connection, or detachable connection or non-detachable connection, or integrally connected, can be mechanical connection, or electrical connection or can communicate with each other, can be directly connected, or indirectly connected through intermediate medium, can be the internal communication of two elements, indirect communication or the interaction relationship of two elements.

[0039] In the description of the utility model, "before use" refers to the state of the distal embolic protector before use, before entering the human body or before contacting with the body fluid such as blood, tissue fluid and the like in the human body, and "in use" refers to the state of the distal embolic protector after entering the human body or contacting with the body fluid such as blood, tissue fluid and the like in the human body.

[0040] In the description of the utility model, "gathered state" refers to the state that the local length range or the whole length range of the "first protection umbrella", "second protection umbrella" and "support body" are attached together.

[0041] In the description of the utility model, "inflated state" refers to the state that the "first protection umbrella" and "second protection umbrella" are inflated and contact with the blood vessel wall.

[0042] In the description of the utility model, "in vivo environment" refers to the environment below the epidermis of the skin, where the body fluid exists, for example, the dermis layer and subcutaneous tissue, or the inside of blood vessels and organs.

[0043] In the description of the utility model, the "proximal end" refers to the end closer to the operator, and the "distal end" refers to the end farther from the operator.

[0044] The utility model will be described in detail below in combination with examples. It should be noted that the examples in the utility model and the features in the examples can be combined with each other without conflict.

[0045] The utility model aims at the problem of insufficient stability of the protection umbrella in the blood vessel and easy displacement in the prior art.

[0046] In the utility model, referring to Figure 3 , a distal embolism protector is disclosed, which comprises a delivery guide wire 1, and the delivery guide wire 1 can be a stainless steel pipe.

[0047] Referring to Figure 3 , a protection assembly is arranged on the delivery guide wire 1 and located at the distal end of the delivery guide wire 1, and is located at the distal end of the thrombus-removing stent during surgery; the protection assembly is connected to the delivery guide wire 1 in a bonding or one-piece forming manner, and it should be noted that the protection assembly needs to be located at least 2mm from the distal end of the thrombus-removing stent, and the area coverage of the protection assembly on the blood vessel longitudinal section is always greater than or equal to the area coverage of the thrombus-removing stent on the blood vessel longitudinal section during the recovery process.

[0048] Referring to Figure 3 , wherein the protection assembly comprises a first protection umbrella 3a and a second protection umbrella 3b arranged in sequence from the proximal end to the distal end of the delivery guide wire 1; during the recovery process, the area coverage of the second protection umbrella 3b on the blood vessel longitudinal section is always greater than or equal to the area coverage of the first protection umbrella 3a on the blood vessel longitudinal section. The first protection umbrella 3a and the second protection umbrella 3b both comprise a braided part 31 made of a nickel-titanium alloy wire and a fixed part 32, wherein the braided part 31 is umbrella-shaped, has a plurality of small mesh openings, allows blood to pass through, and the thrombus is captured by the braided part 31 when passing through the braided part 31. The distal end of the braided part 31 is gathered and connected to the delivery guide wire 1 in a bonding manner. In other embodiments of the application, the distal end of the braided part 31 is gathered and integrally formed with the delivery guide wire 1. It should be particularly noted that the mesh opening size of the braided part 31 of the first protection umbrella 3a is greater than the mesh opening size of the braided part 31 of the second protection umbrella 3b. The purpose of this design is that even if the first protection umbrella 3a fails to capture all the emboli, the emboli passing through the first protection umbrella 3a will be captured by the braided part 31 of the second protection umbrella 3b with a smaller mesh opening, forming double capture, and the capture capacity for emboli is enhanced.

[0049] The fixed part 32 is preferably made of a nickel-titanium alloy wire, the nickel-titanium alloy wire of the fixed part 32 is welded, bonded or integrally formed with the outer circumferential surface of the proximal end of the braided part 31 in a radial manner, the proximal end of the fixed part 32 is welded, bonded or integrally formed with the delivery guide wire 1, the number of the nickel-titanium alloy wires of the fixed part 32 is less than that of the braided part 31, and in a preferred embodiment, the fixed part 32 includes six nickel-titanium alloy wires which are centered on the delivery guide wire 1. The fixed part 32 is arranged to enhance the stability of the braided part 31, so that the pressure of the blood flow is difficult to cause the displacement of the braided part 31.

[0050] The application also includes a retractable connecting member 5, which is made of a retractable metal wire, such as a nickel-titanium alloy, or a film 51. The two ends of the connecting member 5 are fixedly connected to the outer circumferential surfaces of the first protection umbrella 3a and the second protection umbrella 3b, respectively. In the case of the metal wire, the connecting method can be welding, bonding or hot melting connection. In the case of the film 51, the connecting method is adhesive bonding or hot pressing. The radial dimension of the distal end of the connecting member 5 changes with the radial dimension of the second protection umbrella 3b, and the radial dimension of the proximal end of the connecting member 5 changes with the radial dimension of the first protection umbrella 3a during the automatic expansion of the second protection umbrella 3b. The two ends of the connecting member 5 are in close connection with the first protection umbrella 3a and the second protection umbrella 3b, respectively. In the expanded state, the connecting member 5 increases the contact area with the inner wall of the blood vessel, thereby increasing the frictional resistance between the connecting member 5 and the inner wall of the blood vessel, so that the first protection umbrella 3a and the second protection umbrella 3b are more stable and less likely to displace.

[0051] During the delivery process, the first protection umbrella 3a, the connecting member 5 and the second protection umbrella 3b are all in a gathered state. Once released into the blood vessel, the first protection umbrella 3a, the connecting member 5 and the second protection umbrella 3b automatically expand and tightly adhere to the inner wall of the blood vessel, thereby maintaining high stability.

[0052] In the preferred embodiments of the application, the first protection umbrella 3a and the first protection umbrella 3a each include a braided part 31 connected to the delivery guide wire 1 at the distal end, and a fixed part 32 connected to the delivery guide wire 1 at the proximal end and connected to the braided part 31 at the distal end, and the braided part 31 has a dense mesh structure. It should be noted that the mesh opening of the braided part 31 is formed by braiding a nickel-titanium alloy wire, which is large enough to allow blood to pass through and can capture passing emboli.

[0053] More preferably, the mesh size of the braided portion 31 of the first protection umbrella 3a is larger than the mesh size of the braided portion 31 of the second protection umbrella 3b. The first protection umbrella 3a is equivalent to filtering emboli in one layer, allowing small emboli to pass through the first protection umbrella 3a and then be captured by the second protection umbrella 3b. The advantage of this design is that it is less likely to cause blockage at the first protection umbrella 3a, and a small amount of small emboli will not block the gap between normal or large emboli. At the second protection umbrella 3b, because the amount of small emboli is small, it is difficult to form a large amount of blockage, and the impact on blood flow is small. Through the design of the first protection umbrella 3a and the second protection umbrella 3b, the risk of blood vessel blockage caused by emboli escape is reduced, and the possibility of blockage at the protection umbrella is also reduced, and the risk of distal vascular ischemia is reduced.

[0054] The connecting piece 5 is in abutment with the blood vessel wall after expansion, and the connecting piece 5 can intercept thrombus in the radial direction of the blood vessel, reducing the possibility of thrombus escaping in the radial direction.

[0055] Referring to Figure 3 In the preferred embodiment of the utility model, the connecting piece 5 includes a film 51, the distal end of the film 51 can be connected to the connecting place of the braided portion 31 and the fixed portion 32 of the second protection umbrella 3b by means of glue joint or hot pressing, and the film 51 can be connected to the connecting place of the braided portion 31 and the fixed portion 32 of the first protection umbrella 3a by means of glue joint or hot pressing. The glue joint or hot pressing can ensure the stability of the connection and prevent disconnection.

[0056] Referring to Figure 3 More specifically, the film 51 is a PTFE film, an ePTFE film or a PET film. Preferably, a PTFE film is used, which has good biocompatibility and chemical stability and can withstand the pressure of blood flow.

[0057] Referring to Figure 4 In the preferred embodiment of the utility model, the connecting piece 5 includes a stretchable connecting net 52, the distal end of the stretchable connecting net 52 is welded or bonded to the connecting place of the braided portion 31 and the fixed portion 32 of the second protection umbrella 3b, and the proximal end of the stretchable connecting net 52 is welded or bonded to the connecting place of the braided portion 31 and the fixed portion 32 of the first protection umbrella 3a. The purpose of providing the stretchable connecting net 52 is to allow the stretchable connecting net 52 to expand and contract with the expansion and contraction of the first protection umbrella 3a and the second protection umbrella 3b, thereby ensuring the stability of the connection between the first protection umbrella 3a and the second protection umbrella 3b and avoiding displacement during use.

[0058] Further, the stretchable connecting net 52 is a component made of an alloy with memory function, preferably a nickel-titanium alloy wire.

[0059] In the preferred embodiment of the utility model, the telescopic connecting net 52 comprises nickel-titanium alloy wires which are transversely and longitudinally interlaced, and in the expanded state, the longitudinal nickel-titanium alloy wires are attached to the inner wall of the blood vessel on the longitudinal section of the blood vessel.

[0060] In the preferred embodiment of the utility model, the delivery guide wire 1, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5 are all attached with developing points 4, and the developing points 4 are arranged in equal annular shape on the blood vessel longitudinal section of the delivery guide wire 1, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5, and at least ensure that there are developing points 4 in four directions at equal intervals on the outer cylindrical surface.

[0061] In the preferred embodiment of the utility model, the delivery guide wire 1 is one of a high polymer tube, a braided tube, a coil tube and a metal tube. The proximal end of the delivery guide wire 1 is located in the delivery catheter, and in the recovery process, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5 gradually gather.

[0062] The distal embolism protector of the utility model will be described in detail through specific embodiments.

[0063] Embodiment 1

[0064] The distal embolism protector, referring to Figure 1 and Figure 2 , the protection assembly comprises the first protection umbrella 3a and the second protection umbrella 3b which are sequentially arranged from the proximal end to the distal end of the delivery guide wire 1; the first protection umbrella 3a and the second protection umbrella 3b both comprise a woven part 31 and a fixed part 32 which is connected to the proximal end of the woven part 31, and the proximal end of the fixed part 32 is attached, welded or hot-melt connected to the delivery guide wire 1. The woven part 31 is provided with a plurality of small mesh openings, the woven part 31 allows blood to pass through, and captures the thrombus when the thrombus passes.

[0065] Referring to Figure 1 , as to the shape of the woven part 31, the woven part 31 is preferably in the shape of an umbrella, the opening size gradually decreases from the proximal end to the distal end, and the distal end of the woven part 31 gathers and is attached to the delivery guide wire 1. In this embodiment, the first protection umbrella 3a and the second protection umbrella 3b are coaxially arranged.

[0066] Referring to Figure 2 , in other embodiments of the present application, the woven part 31 is attached to the delivery guide wire 1, and the woven part 31 needs to have a large proximal end opening, the opening size gradually decreases from the proximal end to the distal end, and the openings at both ends of the woven part 31 can be coaxial or non-coaxial. The purpose of the design here is to adapt to the curved section of the blood vessel, so that the protection umbrella is better attached to the inner wall of the blood vessel.

[0067] Embodiment 2

[0068] Referring to Figure 3The embodiment provides a distal embolus protector, as shown in the figure, which comprises a delivery guide wire 1 made of a high polymer tube, and in other embodiments of the application, the delivery guide wire 1 can also be a stainless steel tube. In the expanded state, the proximal end of the delivery guide wire 1 is located in the delivery catheter, and the distal end of the delivery guide wire 1 is located outside the delivery catheter, the delivery guide wire 1 is sequentially provided with a first protection umbrella 3a, a connecting piece 5 and a second protection umbrella 3b from the proximal end to the distal end, and the first protection umbrella 3a, the connecting piece 5 and the second protection umbrella 3b are in the expanded state.

[0069] The first protection umbrella 3a and the second protection umbrella 3b both comprise a woven part 31 bonded with the delivery guide wire 1 at the distal end, the woven part 31 is a member woven by nickel-titanium alloy wires, and has a plurality of mesh openings. The woven part 31 is umbrella-shaped, the distal end is gathered at the delivery guide wire 1, and the proximal end is connected with a fixing part 32, the fixing part 32 comprises a plurality of nickel-titanium alloy wires connected to the delivery guide wire 1 in a radial manner, and the fixing part 32 is arranged to enhance the stability of the woven part 31, so that the pressure of the blood flow is difficult to cause the woven part 31 to be displaced.

[0070] It should be noted that the mesh opening size of the woven part 31 allows blood to pass through, and the embolus is captured when the embolus passes.

[0071] In the embodiments of the application, the mesh opening size of the first protection umbrella 3a is larger than that of the second protection umbrella 3b, and the purpose of the design is to enable the small embolus generated by crushing under pressure to be captured by the second protection umbrella 3b even if it passes through the first protection umbrella 3a, thereby enhancing the capture capability of the embolus. At the same time, since the small embolus passes through the first protection umbrella 3a, it will not block the gap between the larger or normal embolus, so as to avoid causing the blood flow to be blocked, and the amount of small embolus is small, so even if it is accumulated at the second protection umbrella 3b, it is difficult to have a great impact on the blood flow.

[0072] The two ends of the connecting piece 5 are respectively bonded with the outer circumferential surfaces of the first protection umbrella 3a and the second protection umbrella 3b, the connecting piece 5 can be expanded and contracted by itself, and will be expanded by itself when released, so as to be tightly attached to the inner wall of the blood vessel, thereby increasing the contact area with the inner wall of the blood vessel, and further increasing the frictional resistance, so that the first protection umbrella 3a and the second protection umbrella 3b are more stable.

[0073] In the preferred embodiments of the utility model, the delivery guide wire 1, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5 are all bonded with developing points 4, the developing points 4 are arranged in equal annular shapes on the blood vessel longitudinal sections of the delivery guide wire 1, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5, and at least ensure that there are developing points 4 in four directions at equal intervals on the outer circumferential surface. In the operation process, the positions of the delivery guide wire 1, the first protection umbrella 3a, the second protection umbrella 3b and the connecting piece 5 can be conveniently observed through the developing points 4, and the operation is facilitated.

[0074] Embodiment 3

[0075] With reference to Figure 3 , the embodiment is based on the embodiment 2, further illustrate the connecting piece 5, the connecting piece 5 includes the film 51, the film 51 preferably adopts PTFE film, the film 51 far end is connected to the woven part 31 and the fixed part 32 junction of the second protective umbrella 3b by the way of cementing, the film 51 proximal end is connected to the woven part 31 and the fixed part 32 junction of the first protective umbrella 3a by the way of cementing. The film 51 can shrink with the contraction of the first protective umbrella 3a and the second protective umbrella 3b, and expand with the expansion, and has good biocompatibility, which can improve the stability of the first protective umbrella 3a and the second protective umbrella 3b.

[0076] Embodiment 4

[0077] With reference to Figure 4 , the embodiment is based on the embodiment 2, further illustrate the connecting piece 5, the connecting piece 5 includes the stretchable connecting net 52, the distal end of the stretchable connecting net 52 is welded to the woven part 31 and the fixed part 32 junction of the second protective umbrella 3b, and the proximal end of the stretchable connecting net 52 is welded to the woven part 31 and the fixed part 32 junction of the first protective umbrella 3a. By setting the stretchable connecting net 52, the stretchable connecting net 52 expands with the expansion of the first protective umbrella 3a and the second protective umbrella 3b, and shrinks with the contraction, which ensures the connection stability of the first protective umbrella 3a and the second protective umbrella 3b, and avoids displacement during use.

[0078] Embodiment 5

[0079] With reference to Figure 5 and Figure 6 , the embodiment is based on the embodiment 2, further illustrate the first protective umbrella 3a and the second protective umbrella 3b, the shape of the first protective umbrella 3a and the second protective umbrella 3b is funnel-shaped, the proximal end opening is large, and the opening size gradually decreases from the proximal end to the distal end. The two end openings of the first protective umbrella 3a and the second protective umbrella 3b can be concentric or eccentric. When facing a curved blood vessel segment, the eccentric protective umbrella can better adapt to the inner wall of the blood vessel. The distal end of the first protective umbrella 3a and the second protective umbrella 3b is connected to the delivery guide wire 1 by adhesion or heat fusion, and in another embodiment of the application, the first protective umbrella 3a and the second protective umbrella 3b are integrally formed with the delivery guide wire 1.

[0080] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can be variously changed and modified. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A distal embolic protector, comprising: The application relates to a delivery guide wire (1); A protection assembly (2) is arranged on the delivery guide wire (1) and located at the distal end of the delivery guide wire (1); The protection assembly (2) comprises a first protection umbrella (3a) and a second protection umbrella (3b) arranged in sequence from the proximal end to the distal end of the delivery guide wire (1); The first protection umbrella (3a) and the second protection umbrella (3b) each comprise a braided part (31) connected to the delivery guide wire (1) at the distal end and a fixed part (32) connected to the delivery guide wire (1) at the proximal end and connected to the braided part (31) at the distal end, and the braided part (31) is a braided dense mesh structure.

2. A distal embolic protector according to claim 1, wherein, The application further relates to a telescopic connecting part (5) fixedly connected to the outer circumferential surface of the first protection umbrella (3a) and the second protection umbrella (3b) at two ends, respectively, wherein the radial dimension of the distal end of the connecting part (5) changes with the radial dimension of the second protection umbrella (3b), and the radial dimension of the proximal end of the connecting part (5) changes with the radial dimension of the first protection umbrella (3a).

3. A distal embolic protector according to claim 2, wherein the distal end of the tubular member is provided with a plurality of barbs. The mesh opening size of the braided part (31) of the first protection umbrella (3a) is larger than the mesh opening size of the braided part (31) of the second protection umbrella (3b).

4. A distal embolic protector according to claim 3, wherein the distal end of the tubular member is provided with a plurality of barbs. The connecting part (5) comprises a film (51) connected at the distal end to the connecting position of the braided part (31) and the fixed part (32) of the second protection umbrella (3b) and connected at the proximal end to the connecting position of the braided part (31) and the fixed part (32) of the first protection umbrella (3a).

5. A distal embolic protector according to claim 4, wherein the distal end of the tubular member is provided with a plurality of barbs. The film (51) is a PTFE film, an ePTFE film or a PET film.

6. A distal embolic protector according to claim 2, wherein the distal end of the tubular member is tapered. The connecting part (5) comprises a telescopic connecting mesh (52) connected at the distal end to the connecting position of the braided part (31) and the fixed part (32) of the second protection umbrella (3b) and connected at the proximal end to the connecting position of the braided part (31) and the fixed part (32) of the first protection umbrella (3a).

7. A distal embolic protector according to claim 6, wherein the distal end of the tubular member is provided with a plurality of barbs. The telescopic connecting mesh (52) is a component made of a nickel-titanium alloy wire.

8. A distal embolic protector according to claim 7, wherein the distal end of the tubular member is provided with a plurality of barbs. The telescopic connecting mesh (52) comprises a nickel-titanium alloy wire crosswise and lengthwise interlaced, and in the expanded state, the lengthwise nickel-titanium alloy wire is attached to the inner wall of the blood vessel in the longitudinal section of the blood vessel.

9. A distal embolic protector according to claim 8, wherein the distal end of the tubular member is provided with a plurality of barbs. The delivery guide wire (1), the first protection umbrella (3a), the second protection umbrella (3b) and the connecting part (5) are each provided with a plurality of developing points (4).

10. A distal embolic protector according to any one of claims 1-9, wherein the distal end of the tubular member is tapered. The delivery guide wire (1) is one of a polymer tube, a braided tube, a coil tube and a metal tube.

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