Distal embolic protection device

Abstract

A protective umbrella and intracavity umbrella ribs are coaxially arranged on a conveying guide wire of the far-end embolism protection device, a supporting bracket of the protective umbrella is of a hollow structure, two first openings are formed in the near end of the supporting bracket and are symmetrically arranged along the central axis of the supporting bracket, and a covering film is fixed to the far end of the supporting bracket and wraps a part of the far end of the supporting bracket; a plurality of holes are formed in the covering film, the intracavitary umbrella ribs are located in the supporting support and are of a hollow structure, and second openings of the intracavitary umbrella ribs face the far end of the supporting support. The intracavity umbrella ribs and the covering film form a double-layer filtering structure, so that the situation that thrombus clots are accumulated in the inner cavity of the protection umbrella is effectively improved, the probability that meshes / micropores of the protection umbrella are blocked is reduced, and sufficient blood supply of a nervous system is ensured; the intracavitary umbrella ribs and the supporting bracket are coaxially arranged, so that the stability of the protective umbrella in the blood vessel is improved, the protective umbrella is not prone to inclination, and effective capture of free thrombus is ensured; the arrangement of the two first openings ensures that an effective capture channel can be provided even in an inclined condition.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a coaxial distal embolism protection device. Background Art

[0002] During peripheral artery and coronary artery intervention, the effects of implanted interventional devices such as guidewires, catheters, balloons and stents can lead to the formation of free thrombi, which may be impacted by the blood flow into the nervous system, causing vascular obstruction in the nervous system and causing fatal damage to the patient. Therefore, clinically, embolic protection devices (distal protection umbrellas) are usually placed at the distal end of the blood flow at the lesion site to capture free thrombi and thus avoid embolism of the nervous system.

[0003] In the prior art, embolic protection devices can be classified into two types, eccentric and coaxial, according to the relative position relationship between the proximal opening and the delivery guidewire. Among them, the guidewire and the protective umbrella of the eccentric embolic protection device are not coaxial, the proximal opening has no obstruction structure, and the capture efficiency of free thrombus clots is high; but the disadvantage is that the centrality is poor, and the force is uneven during operation and it is easy to deflect. At this time, whether the proximal opening is a circular opening parallel to the cross-section of the blood vessel or an elliptical opening at a certain angle to the cross-section of the blood vessel, the proximal opening will be blocked and part of the capture function will be lost. In extreme cases, the proximal opening of the protective umbrella will be completely attached to the blood vessel wall, causing the protective umbrella to completely lose its function. The coaxial embolic protection device overcomes the disadvantage of the eccentric type that is easy to tilt, but because of the need to maintain the coaxial effect, it is necessary to add several connecting rods between the delivery guidewire and the protection device. The interference of the connecting rods reduces the capture efficiency of free thrombus.

[0004] Existing embolic protection devices can be divided into woven mesh type and film type according to their structure. Among them, the woven mesh type uses dense mesh holes to intercept thrombus clots with a diameter larger than the mesh holes, and allows blood cells with a diameter smaller than the mesh holes to pass through the mesh holes to supply blood to the nervous system. Similarly, the film type processes a number of micropores on the film to intercept thrombus clots with a diameter larger than the micropores, and allows blood cells with a diameter smaller than the micropores to pass through the micropores to supply blood to the nervous system. However, if a large number of or large-sized thrombus clots accumulate in the inner cavity of the protection device, it will cause the mesh holes / micropores to be blocked, resulting in insufficient blood supply to the nervous system and causing harm to the patient.

[0005] Therefore, it is necessary to provide a coaxial distal embolic protection device that can improve capture efficiency and reduce mesh / micropore blockage to solve the above problems. Summary of the invention

[0006] The object of the present invention is to provide a coaxial distal embolic protection device capable of improving capture efficiency and reducing mesh / micropore blockage.

[0007] To achieve the above-mentioned purpose, the technical solution of the present invention is as follows: a distal embolic protection device is provided, which includes a delivery guide wire, a protective umbrella and an intracavitary umbrella rib; wherein the protective umbrella includes a support bracket and a coating, the support bracket is a hollow structure and has two first openings at the proximal end, the two first openings are symmetrically arranged along the central axis of the support bracket, the support bracket is coaxially penetrated on the delivery guide wire, and the support bracket has a pressed grip state and an expanded state, the coating is fixed to the distal end of the support bracket and adheres to the outside of the support bracket, the coating wraps a part of the support bracket, the coating can shrink and expand with the support bracket, and a plurality of holes are opened on the coating; the intracavitary umbrella rib is a hollow structure and has a second opening, the intracavitary umbrella rib is coaxially fixed to the delivery guide wire and is located in the support bracket, the second opening faces the distal end of the support bracket, and the intracavitary umbrella rib can be folded and expanded with the support bracket.

[0008] Preferably, the first opening is fusiform or wedge-shaped, the length direction of each first opening is the same as the axial direction of the central axis of the support bracket, and the surface where each first opening is located forms an angle with the cross-section of the blood vessel. With this structural arrangement, even if the support bracket is tilted and the first opening on one side is blocked by the blood vessel wall, the first opening on the other side can still provide an effective capture channel equivalent to the entire blood vessel cross-sectional area, thereby improving the capture efficiency.

[0009] Preferably, the support bracket has a shuttle-shaped structure, which effectively increases the wall-adhering area, enhances the wall-adhering performance, and is not easy to tilt during use; in addition, the release and recovery of the protective umbrella is achieved by transmitting force through the delivery guide wire, and the shuttle-shaped support bracket can keep the delivery guide wire in the center of the bracket segment, which is more conducive to the operation of the device.

[0010] Preferably, the support bracket includes a coaxially arranged cylindrical section and conical sections arranged at both ends of the cylindrical section, and the first opening is formed in one of the conical sections. The cylindrical section increases the wall-attaching area and enhances its wall-attaching performance, making it difficult for the support bracket to tilt; in addition, the support bracket adopts a coaxial connection method, which further improves its stability in the blood vessel, thereby effectively avoiding the situation where the first opening adheres to the blood vessel wall.

[0011] Preferably, the support stent includes a coaxially arranged proximal stop ring, a distal stop ring, and a plurality of first branches connected therebetween, the plurality of first branches being staggered to form a mesh-like hollow structure, and the proximal stop ring and the distal stop ring being respectively sleeved outside the delivery guide wire. The coaxial connection between the support stent and the delivery guide wire further improves the stability of the support stent in the blood vessel, making it difficult for the support stent to tilt.

[0012] Preferably, the first branch rods include a proximal connecting rod, a distal connecting rod and a middle connecting rod, a plurality of the middle connecting rods are staggered and connected to form a cylindrical segment with a hollow structure, at least two of the proximal connecting rods are connected to the middle connecting rod and the proximal limiting ring to form the first opening, and a plurality of the distal connecting rods are connected to the middle connecting rod and the distal limiting ring at intervals along the circumferential direction.

[0013] Preferably, the protective umbrella further comprises a head end developing sleeve ring, which is coaxially sleeved outside the distal end limiting ring, so as to press the coating tightly between the head end developing sleeve ring and the distal end limiting ring. The head end developing sleeve ring provides effective protection for fixing the coating on the supporting bracket, and also facilitates the positioning of the protective umbrella in the body.

[0014] Preferably, the distal limiting ring includes a first tube section and a second tube section in a stepped shape, and the head end developing ring is coaxially sleeved outside the first tube section and abuts against the end surface of the second tube section, thereby stably fixing the coating to the distal end of the support bracket.

[0015] Preferably, the head end developing sleeve is made of a radiopaque metal material.

[0016] Preferably, the head end developing sleeve is made of gold, platinum, tungsten or an alloy of at least two of the foregoing.

[0017] Preferably, the protective umbrella also includes two bracket developing springs, the two bracket developing springs are fixed on the supporting bracket and symmetrically arranged along the central axis of the supporting bracket, and the connecting line of the head end developing ring and the two bracket developing springs forms an isosceles triangle, thereby forming an isosceles triangle developing effect. The operator can easily judge the deployment status of the protective umbrella, whether it is tilted, the release position, etc. according to the direction of the blood vessel and the relative positions of the three points, and can make timely adjustments.

[0018] Preferably, the support bracket is provided with an assembly branch rod, the bracket developing spring is fixed to the assembly branch rod and exposed outside the coating, and the bracket developing spring can be observed under X-rays, thereby the deployment status and corresponding position of the protective umbrella can be intuitively observed, thereby providing guidance for subsequent operations.

[0019] Preferably, the apertures of the holes on the coating gradually increase in the direction from the distal end to the proximal end along the central axis of the support stent, and the apertures of the holes are the same in the same cross section perpendicular to the central axis of the support stent. Since thrombi always tend to accumulate near the central axis of the cone of the protective umbrella, this arrangement of the holes can filter out free thrombi of smaller size and ensure sufficient blood flow, thereby fully supplying blood to the nervous system.

[0020] Preferably, the covering film comprises a distal ring and an umbrella cap fixed to the distal ring, the distal ring is fixed to the distal end of the supporting bracket, and the umbrella cap is attached to the outside of the supporting bracket to form a protective umbrella.

[0021] Preferably, the umbrella cover includes a cone portion and a cylindrical portion, the tip of the cone portion is fixed to the distal ring, and the hole is at least opened in the cone portion, which can not only filter out small-sized free thrombi, but also ensure sufficient blood flow to fully supply blood to the nervous system.

[0022] Preferably, the coating is adhered to the outside of the supporting bracket by heat shrinking, bonding or sewing with PP sutures.

[0023] Preferably, the coating is a plastic film, and the holes are formed on the coating by laser processing.

[0024] Preferably, the intracavitary ribs include a rib limit ring and a plurality of second branches, each of which is fixed to the rib limit ring at intervals along the circumference thereof, and the second opening is formed at one end of each of the second branches away from the rib limit ring, and the rib limit ring is coaxially fixed to the delivery guide wire. The intracavitary ribs and the peritoneum form a double-layer filtering structure. First, the intracavitary ribs are used to filter free thrombi of larger sizes, which can prevent free thrombi from accumulating in the cone of the protective umbrella; then, the covering film is used to capture free thrombi of smaller sizes, ensuring the blood flow of the nervous system during surgery. Compared with the single-layer filtering structure in the prior art, the double-layer filtering structure of the present application solves the problem of free thrombi accumulating in the umbrella cavity, thereby effectively avoiding the clogging of the mesh or micropores. In addition, the intracavitary ribs also increase the support of the protective umbrella, making it less likely for the protective umbrella to tilt or fail to fully unfold.

[0025] Preferably, each of the second branches is integrally formed with the rib limiting ring or is formed separately and then fixed as one.

[0026] Preferably, the outer diameter of the intracavitary rib when unfolded is smaller than the inner diameter of the support bracket when in the expanded state, thereby providing a cavity for the passage of blood and ensuring smooth passage of blood to provide blood supply to the nervous system.

[0027] Preferably, the supporting bracket and the intracavitary ribs are both made of shape memory alloy through laser cutting, sandblasting, electrolytic polishing and heat treatment.

[0028] Preferably, the distal embolic protection device further comprises a push spring, which is fixed to the delivery guide wire and located between the proximal end of the intracavitary umbrella rib and the proximal end of the support bracket. Therefore, when a free thrombus is found near the first opening of the support bracket, the delivery guide wire can be rotated to drive the push spring to generate a vortex, and the free thrombus near the first opening can be pushed into the inner cavity of the protective umbrella, thereby improving the capture efficiency.

[0029] Preferably, the distal embolic protection device further comprises a guidewire development spring, and the guidewire development spring is fixed to the distal end of the delivery guidewire.

[0030] Preferably, the guidewire development spring is made of a radiopaque metal material and is fixed to the distal end of the delivery guidewire by laser welding or brazing.

[0031] Preferably, the guide wire development spring is made of gold, platinum, tungsten or an alloy of at least two of the foregoing.

[0032] Preferably, the delivery guide wire includes a grinding section and a coating section, the flexibility of the grinding section is greater than the flexibility of the coating section, and the guide wire development spring, the intracavitary rib, and the push spring are all fixed to the grinding section. Thus, under the premise of ensuring the pushing ability of the delivery guide wire, the delivery guide wire has a softer distal structure, ensuring good bending ability in tortuous blood vessels and protection of the blood vessel wall.

[0033] Preferably, the delivery guide wire is formed of a shape memory alloy or a stainless steel wire, and the grinding section has a plurality of tapered sections formed by grinding, so as to have a softer distal structure while ensuring the pushing ability of the delivery guide wire; the coating section is coated with a plastic coating, a hydrophilic coating or a hydrophobic coating in sequence, so that the delivery guide wire has better smoothness.

[0034] Preferably, the distal end of the delivery guidewire has a guidewire tip, and the guidewire tip has a smooth fusion head to protect the blood vessel wall.

[0035] Compared with the prior art, the distal embolism protection device of the present invention has a protective umbrella and intracavitary ribs on the delivery guide wire, wherein the protective umbrella includes a supporting bracket and a coating fixed to the distal end of the supporting bracket and attached to the outside of the supporting bracket, a plurality of holes are opened on the coating, and a layer of filtering structure is formed by the supporting bracket and the coating, and the intracavitary ribs are fixed in the supporting bracket and have a hollow structure, thereby forming another layer of filtering structure. Firstly, some larger free thrombi are filtered by the intracavitary ribs, and then the smaller free thrombi are captured by the covering film, thereby effectively improving the accumulation of thrombus clots in the inner cavity of the protective umbrella, reducing the probability of blockage of the mesh / micropores of the protective umbrella, and providing cavities for the passage of blood flow, thereby ensuring sufficient blood supply to the nervous system; secondly, the support bracket and the intracavitary ribs are coaxially arranged with the delivery guide wire, which strengthens the support of the protective umbrella, makes the support bracket less likely to tilt, improves the stability of the protective umbrella in the blood vessel, and ensures the effective capture of free thrombi; furthermore, the setting of the two first openings not only reduces the interference of the opening position of the protective umbrella on the thrombus, but also greatly improves the capture efficiency of the thrombus on the basis of the coaxial structure, and even when the protective umbrella tilts and causes the first opening on one side to be blocked by the blood vessel wall, the first opening on the other side can still provide an effective capture channel equivalent to the entire blood vessel cross-sectional area, further ensuring the capture efficiency of the thrombus. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the distal embolic protection device of the present invention.

[0037] Figure 2a yes Figure 1 Schematic diagram of the structure from another angle.

[0038] Figure 2b yes Figure 2a Enlarged schematic diagram of part A.

[0039] Figure 3 yes Figure 1 Top view of the .

[0040] Figure 4 yes Figure 1 Schematic diagram of the structure of the umbrella.

[0041] Figure 5 yes Figure 4 Schematic diagram of the structure of the supporting bracket.

[0042] Figure 6 yes Figure 4 A schematic diagram of the structure of the support bracket at another angle.

[0043] Figure 7 yes Figure 6 Top view of the .

[0044] Figure 8 yes Figure 6 Side view of.

[0045] Fig. 9 yes Figure 6 Top view in the crimped state.

[0046] Fig.10 yes Figure 1 Schematic diagram of the structure of the coating.

[0047] Fig.11 yes Fig.10 Top view of the .

[0048] Fig.12 yes Figure 1 Schematic diagram of the structure of the intracavity umbrella ribs.

[0049] Fig.13 yes Fig.12 Side view of.

[0050] Fig.14 yes Fig.12 Schematic diagram of the structure in which the intracavitary umbrella rib is fixed to the delivery guide wire.

[0051] Fig.15 yes Figure 1 Schematic diagram of the structure of the delivery guide wire.

[0052] Fig.16 yes Fig.16 A partial enlarged schematic diagram of .

[0053] Fig.17 It is a schematic diagram of the interception state of the distal embolic protection device of the present invention. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are now described with reference to the accompanying drawings, in which similar element numbers represent similar elements. It should be noted that the orientation descriptions involved in the present invention, such as the orientations or positional relationships indicated by up, down, left, right, front, and back, are all based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the present application or / 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 a limitation on the present application. The first, second, etc. described are only used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0055] It should also be pointed out that the proximal end referred to in this application refers to the end close to the operator during the operation, and the distal end refers to the end far away from the operator during the operation.

[0056] Combination Figure 1-Figure 17 As shown, the present invention provides a coaxial distal embolic protection device 1, which can not only reduce the interference of the connecting rod of the existing coaxial protection device, thereby improving the efficiency of thrombus capture, but also designs a double-layer inner cavity structure, thereby effectively reducing the blockage of the mesh / micropores and ensuring the safety of clinical use.

[0057] Continue to combine Figure 1-Figure 17 As shown, in one embodiment of the present invention, the distal embolic protection device 1 includes a delivery guide wire 100, a protective umbrella 200, and an intracavitary umbrella rib 300. The protective umbrella 200 is coaxially mounted on the delivery guide wire 100, and the proximal end of the protective umbrella 200 is provided with two first openings 210a, the two first openings 210a are symmetrically arranged along the central axis of the protective umbrella 200, and the distal end of the protective umbrella 200 is provided with a hole 220a. The intracavitary umbrella rib 300 is coaxially mounted on the delivery guide wire 100 and is located in the protective umbrella 200. The intracavitary umbrella rib 300 is a hollow structure and has a second opening 300a, and the second opening 300a faces the distal end of the protective umbrella 200. In the present application, the protective umbrella 200 and the intracavitary umbrella rib 300 are coaxially arranged on the delivery guide wire 100, which improves the stability of both in the blood vessel and is not easy to tilt during use; and the setting of the two first openings 210a not only reduces the interference of the opening position of the protective umbrella 200 on the thrombus, greatly improving the capture efficiency of the thrombus, but also even if the protective umbrella 200 is tilted and the first opening 210a on one side is blocked by the blood vessel wall, the first opening 210a on the other side can still provide an effective capture channel equivalent to the entire blood vessel cross-sectional area, further ensuring the capture efficiency of the thrombus; further, the intracavitary umbrella rib 300 and the protective umbrella 200 form a double-layer filtering structure, thereby effectively reducing the probability of mesh / micropore blockage and ensuring sufficient blood supply to the nervous system.

[0058] Combine the following Figure 1-3 , Fig.14 As shown, in a preferred embodiment, the distal embolic protection device 1 further includes a push spring 400, which is fixed to the delivery guide wire 100 and located between the proximal end of the intracavitary rib 300 and the proximal end of the protective umbrella 200. For example, the push spring 400 is fixed to the delivery guide wire 100 by welding, bonding or other fixing methods, which are not specifically limited here. The length of the push spring 400 preferably extends from the proximal end of the intracavitary rib 300 to the proximal end of the protective umbrella 200, as shown in FIG. Figure 1 In use, when a free thrombus is found near the opening of the protective umbrella 200, the delivery guide wire 100 can be rotated to drive the push spring 400 to generate a vortex, and the free thrombus near the opening of the protective umbrella 200 can be pushed into the inner cavity of the protective umbrella 200, thereby further improving the capture efficiency.

[0059] Combine the following Figure 1-Figure 11 , Fig.17 As shown, in one embodiment of the present invention, the protective umbrella 200 includes a support bracket 210 and a coating 220. Among them, the support bracket 210 is coaxially arranged on the delivery guide wire 100, and the support bracket 210 has a clamping state and an expansion state. The coaxial connection of the support bracket 210 improves its stability in the blood vessel, thereby effectively avoiding the situation where the first opening 210a is not coaxial with the blood vessel cavity. At the same time, the support bracket 210 is a hollow structure and two first openings 210a are provided at its proximal end. The two first openings 210a are symmetrically arranged along the central axis of the support bracket 210. That is to say, the two first openings 210a are arranged on both sides of a plane passing through the central axis of the support bracket 210. The length direction of each first opening 210a extends along the central axis direction of the support bracket 210, and the surface where each first opening 210a is located is at an angle with the cross-section of the blood vessel, such as Fig.17 In this embodiment, each first opening 210a has a larger width in the middle and smaller widths at both ends. Specifically, on the projection surface of the aforementioned plane, each first opening 210a is in a shuttle shape, as shown in FIG. Figure 4-5 As shown. This shape setting makes the interference near the first opening 210a smaller, thereby greatly improving the capture efficiency of the thrombus. Of course, the first opening 210a is not limited to the shuttle shape. For example, it is feasible to set it to a wedge shape or other shapes that are conducive to the entry of the thrombus. In addition, the two oppositely arranged first openings 210a, even if the support bracket 210 is tilted so that the first opening 210a on one side is blocked by the blood vessel wall, the first opening 210a on the other side can still provide an effective capture channel equivalent to the entire blood vessel cross-sectional area, further ensuring the capture efficiency of the thrombus.

[0060] In this embodiment, the coating 220 is fixed to the distal end of the support stent 210 and adheres to the outside of the support stent 210, and the coating 220 wraps a part of the support stent 210, that is, the proximal part of the support stent 210 is exposed outside the coating 220. The coating 220 is provided with a plurality of holes 220a, so that the free thrombus of a smaller size entering the support stent 210 is captured by the coating 220, and the holes 220a ensure that the blood can flow normally. In addition, the coating 220 can shrink and expand with the support stent 210, thereby putting the protective umbrella 200 in a clamping state and an expanded state. In the clamping state, the distal embolic protection device 1 can be inserted into the blood vessel or withdrawn from the blood vessel. In the expanded state, the protective umbrella 200 is placed at the distal end of the blood flow at the lesion site to capture free thrombus clots.

[0061] Combine the following Figure 4-Figure 9As shown, in one embodiment of the present invention, in terms of shape, the support bracket 210 is in a fusiform structure when in an expanded state, thereby effectively increasing the wall-attaching area, enhancing its wall-attaching performance, and not easily tilting during use. In addition, the release and recovery of the protective umbrella 220 is achieved by transmitting force through the delivery guide wire 100. The fusiform support bracket 210 can keep the delivery guide wire 100 in the center of the bracket segment, which is more conducive to the operation of the device.

[0062] Specifically, when the support stent 210 is in an expanded state, it includes a coaxially arranged cylindrical section 210b and tapered sections 210c arranged at both ends of the cylindrical section 210b, both tapered sections 210c gradually narrow in a direction away from the cylindrical section 210b, and are connected to the delivery guide wire 100 through the two tapered sections 210c, and the first opening 210a is formed on the proximal tapered section 210c. The cylindrical section 210b of the support stent 210 fits the inner wall of the blood vessel, thereby increasing the wall-attaching area, enhancing its wall-attaching performance, and making the support stent 210 less likely to tilt.

[0063] Continue to combine Figure 4-Figure 9 As shown, in this embodiment, structurally, the support stent 210 includes a plurality of first branches 211, which are staggered to form a mesh hollow structure, and the distal end of the support stent 210 is covered by the coating 220, so that the proximal end of the support stent 210 is hollowed out, which is convenient for effectively capturing free thrombi. The first branches 211 can be deformed and reset, so that the support stent 210 can be transformed between the two states of the compression state and the expansion state.

[0064] More specifically, the first branch rod 211 includes a proximal connecting rod 2111, a middle connecting rod 2112 and a distal connecting rod 2113. Among them, multiple middle connecting rods 2112 are staggered and connected to form a mesh hollow structure, and the middle connecting rod 2112 forms the cylindrical section 210b after expansion. At least two proximal connecting rods 2111 are connected to the middle connecting rod 2112 to form the first opening 210a. In a specific embodiment, two proximal connecting rods 2111 are provided, and the two proximal connecting rods 2111 are relatively connected to one end of the middle connecting rod 2112, or in other words, the two proximal connecting rods 2111 are relatively connected to one end of the cylindrical section 210b, and two first openings 210a are formed between the two proximal connecting rods 2111. In other words, in the plane P1 (such as Figure 8 As shown in FIG. 1 , two first openings 210a are formed on both sides of the first opening 210a. Figure 5As shown. This structure constituting the first opening 210a reduces the number of rods at the proximal end of the support bracket 210, reduces the interference of the rods on the thrombus, and thus improves the efficiency of capturing the thrombus. A plurality of distal connecting rods 2113 are connected to the other end of the middle connecting rod 2112 at intervals along the circumferential direction, that is, a plurality of distal connecting rods 2113 are connected to the other end of the cylindrical section 210b at intervals along the circumferential direction, and the plurality of distal connecting rods 2113 are gradually gathered together for easy installation with the delivery guide wire 100.

[0065] Combination Figure 7 , Fig. 9 As shown, in a specific embodiment, after the multiple first branches 211 are staggered and connected, they sequentially form the first closed-loop mesh 2111a, the second closed-loop mesh 2112a, the open-loop mesh 2112d, the third closed-loop mesh 2112b, the fourth ring mesh 2112c, and the fifth closed-loop mesh 2113a. Specifically, the multiple middle connecting rods 2112 are staggered and connected to sequentially form the second closed-loop mesh 2112a, the open-loop mesh 2112d, the third closed-loop mesh 2112b, and the fourth ring mesh 2112c. In other words, the cylindrical section 210b is composed of the second closed-loop mesh 2112a, the open-loop mesh 2112d, the third closed-loop mesh 2112b, and the fourth ring mesh 2112c. Among them, the assembly branch rod 214 is set at the open-loop mesh 2112d (see below for details). Different from the conical protective umbrella in the prior art, the cylindrical section 210b of the support bracket 210 in the present application can better fit the blood vessel wall, is not easy to tilt, and can keep the delivery guide wire 100 in the center of the bracket section, which is more conducive to the operation of the device. In addition, the first closed-loop mesh 2111a is formed by two proximal connecting rods 2111. When the support bracket 210 is in an expanded state, the two proximal connecting rods 2111 are both curved, so that the first closed-loop mesh 2111a is opened to form a first opening 210a. At the distal end of the support bracket 210, a fifth closed-loop mesh 2113a is formed by a plurality of distal connecting rods 2113 arranged at intervals. It can be understood that the number of the open-loop mesh and the closed-loop mesh is not limited to that in the present embodiment, and can be flexibly increased or decreased according to the needs of the specific product.

[0066] Recombination Figure 1-3 , Figure 6-Figure 9As shown, in one embodiment of the present invention, the support bracket 210 further includes a coaxially arranged proximal stop ring 212 and a distal stop ring 213, the proximal conical section 210c is connected to the proximal stop ring 212, and the proximal conical section 210c is connected to the distal stop ring 213. Structurally, two proximal connecting rods 2111 are connected to the proximal stop ring 212, and a plurality of distal connecting rods 2113 are connected to the distal stop ring 213. When installed on the delivery guide wire 100, the proximal stop ring 212 and the distal stop ring 213 are respectively sleeved outside the delivery guide wire 100, thereby conveniently realizing the coaxial connection between the support bracket 210 and the delivery guide wire 100, improving the stability of the support bracket 210 in the blood vessel, and making it difficult for the support bracket 210 to tilt.

[0067] In the present invention, at least the first branch rod 211 is formed by shape memory alloys (shape memory alloys, SMA), for example, it is made by laser cutting, sandblasting, electrolytic polishing, and heat treatment of nickel-titanium shape memory alloy. Of course, it can also be made of other shape memory alloys. Since the shape memory alloy (SMA) can automatically restore its own plastic deformation to its original shape at a certain temperature, the conversion of the support bracket 210 between the clamping state and the expansion state is more convenient and smooth. In addition, the proximal limit ring 212 and the distal limit ring 213 can be formed by shape memory alloy (SMA) or other materials, which are not limited here.

[0068] Combine the following Figure 1-4 , Figure 10-11 As shown, in one embodiment of the present invention, the coating 220 includes a distal ring 221 and an umbrella cover 222 fixed to the distal ring 221, and the two can be integrally formed or separately formed and then fixedly connected. The distal ring 221 is fixed to the distal end of the support bracket 210, and the umbrella cover 222 is attached to the outside of the support bracket 210, specifically to the conical section 210c and a part of the cylindrical section 210b at the distal end of the support bracket 210, that is, the shape of the umbrella cover 222 is the same as the shape of the conical section 210c and the cylindrical section 210b at the distal end of the support bracket 210, thereby forming a protective umbrella 200.

[0069] See also Figure 10-11 As shown, in this embodiment, the umbrella cover 222 also includes a cone portion 2221 and a cylindrical portion 2222. The tip of the cone portion 2221 is fixed to the distal ring 221. The cone portion 2221 is attached to the outside of the conical section 210c at the distal end of the support bracket 210, and the cylindrical portion 2222 is attached to the outside of the cylindrical section 210b. Figure 4-5The umbrella cover 222 can be attached to the support bracket 210 by heat shrinking, bonding or PP suture sewing, and other methods can also be used.

[0070] Continue to view Figure 10-11 As shown, in this embodiment, the hole 220a is at least formed in the cone portion 2221. Since thrombi tend to accumulate at the cone portion of the protective umbrella 200 close to the central axis, the position of the hole 220a can filter out free thrombi of smaller size and ensure sufficient blood flow to provide blood supply to the nervous system. Of course, the hole 220a can also be formed on the cylindrical portion 2222.

[0071] In a preferred embodiment, the apertures 220a on the coating 220 gradually increase in diameter along the central axis C of the support bracket 210 from the distal end to the proximal end. In other words, since the holes 220a are provided in the cone portion 2221, that is, in the direction gradually away from the central axis C of the umbrella cover 222, the apertures of the holes 220a gradually increase in diameter. In the same cross section P2 perpendicular to the central axis C of the support bracket 210 (also the central axis C of the umbrella cover 222), the apertures of the holes 220a are the same, such as Fig.11 As shown. Since thrombi always tend to accumulate near the central axis of the cone portion 2221 of the protective umbrella 200, the aperture setting of the hole 220a can filter out free thrombi of smaller size and ensure sufficient blood flow to provide blood supply to the nervous system. In this embodiment, the umbrella cap 222 is processed by laser to form the hole 220a. Of course, other processing methods can also be used.

[0072] In the present invention, the coating 220 is preferably a plastic film, for example, TPU (Thermoplasticpolyurethanes), PTFE (Polytetrafluoroethylene) and other plastic films, but is certainly not limited to the aforementioned materials.

[0073] Combine the following Figure 1-Figure 3 As shown, in one embodiment of the present invention, the protective umbrella 200 further includes a head end developing ring 230, which is coaxially sleeved outside the distal end limiting ring 213, so as to press the coating 220 between the head end developing ring 230 and the distal end limiting ring 213. Specifically, the distal end ring 221 of the coating 220 is fixed between the head end developing ring 230 and the distal end limiting ring 213. The head end developing ring 230 not only provides effective protection for the fixation of the coating 220 on the support bracket 210, but also facilitates the positioning of the protective umbrella 200 in the body.

[0074] Combination Figure 4-Figure 8 As shown, the distal stop ring 213 includes a first tube segment 2131 and a second tube segment 2132 in a stepped shape, and the outer diameter of the first tube segment 2131 is smaller than the outer diameter of the second tube segment 2132. The distal ring 221 of the coating 220 is sleeved outside the distal stop ring 213, and its umbrella cover 222 extends toward the proximal end of the support bracket 210. The head end developing sleeve 230 is coaxially sleeved outside the first tube segment 2131 and abuts against the end surface of the second tube segment 2132, so that the distal ring 221 of the coating 220 is stably pressed between the head end developing sleeve 230 and the distal stop ring 213, so that the coating 220 is stably fixed to the distal end of the support bracket 210.

[0075] In the present invention, the head end developing ring 230 is made of a metal material that is opaque to X-rays. For example, the head end developing ring 230 can be made of gold, platinum, tungsten, or an alloy of at least two of the above. Of course, it is not limited to the above materials. The position of the protective umbrella 200 in the body can be intuitively seen through the head end developing ring 230, thereby facilitating the positioning of the protective umbrella 200 in the body.

[0076] Combine the following Figure 1-Figure 5 As shown, in one embodiment of the present invention, the protective umbrella 200 further includes a bracket developing spring 240 , and the supporting bracket 210 is provided with an assembly branch rod 214 , and the bracket developing spring 240 is fixed to the assembly branch rod 214 and exposed outside the coating 220 .

[0077] Combination Figure 6-Figure 8 As shown, the assembly branch rod 214 is fixed on the middle connecting rod 2112, and the position of the assembly branch rod 214 is set to form an open-loop mesh 2112d. The bracket developing spring 240 is inserted into the assembly branch rod 214 and fixed by laser welding. Of course, it can also be fixed in other ways. The bracket developing spring 240 is also made of a metal material that is not transparent to X-rays. For example, it is made of gold, platinum, tungsten or an alloy of at least two of the above. Therefore, the bracket developing spring 240 can be observed under X-rays, thereby intuitively observing the deployment of the protective umbrella 200 and the corresponding position, providing guidance for subsequent operations.

[0078] Combination Figure 6-8 As shown, in one embodiment of the present invention, two assembly branches 214 are provided, and the two assembly branches 214 are symmetrically arranged along the central axis of the support bracket 210. Specifically, the two assembly branches 214 are arranged in a plane P1 passing through the two proximal connecting rods 2111 and the central axis of the support bracket 210, as shown in FIG. Figure 8 shown.

[0079] Combination Figure 4-5As shown, in this embodiment, the two support developing springs 240 are respectively fixed on the two assembly branches 214. In addition, the connecting line of the head end developing ring 230 and the two support developing springs 240 forms an isosceles triangle developing effect (such as Figure 4 As shown in the figure, the operator can easily determine the deployment status, tilt, release position, etc. of the protective umbrella 200 according to the direction of the blood vessel and the relative positions of the three points, and can make timely adjustments.

[0080] Combine the following Figure 1-3 , Figure 12-14 As shown, in one embodiment of the present invention, the intracavitary rib 300 is specifically fixed in the coating 220. The intracavitary rib 300 includes a rib stop ring 310 and a plurality of second branches 320. Each second branch 320 is fixed to the rib stop ring 310 at intervals along the circumference of the rib stop ring 310, and each second branch 320 is preferably evenly distributed along the circumference of the rib stop ring 310, and one end of each second branch 320 away from the rib stop ring 310 forms the second opening 300a. During installation, the rib stop ring 310 is coaxially fixed to the delivery guide wire 100, and the second opening 300a is directed toward the distal end of the support bracket 210, that is, toward the cone portion 2221 of the coating 220. The intracavitary rib 300 increases the support of the protective umbrella 200, so that the protective umbrella 200 is not prone to tilting and being unable to fully unfold. The ribs 300 in the cavity are folded as the support bracket 210 is pressed and gripped, and are unfolded as the support bracket 210 expands; and the outer diameter of the ribs 300 in the cavity is slightly smaller than the inner diameter of the support bracket 210 when it is in the expanded state. Thus, a double-layer filtering structure is formed by the ribs 300 in the cavity and the coating 220. First, the ribs 300 in the cavity filter free thrombi with larger sizes, which can prevent the free thrombi from accumulating in the cone of the protective umbrella 200, and the gap between the ribs 300 in the cavity and the support bracket 210 provides a cavity for the passage of blood flow, ensuring that the blood passes smoothly to provide blood supply to the nervous system. Then, the coating 220 captures the free thrombi with smaller sizes, and the blood passes through the holes 220a on the coating 220, ensuring that the blood supply to the nervous system is sufficient during the operation. Compared with the single-layer filtering structure in the prior art, the double-layer filtering structure of the present application greatly improves the accumulation of free thrombi in the umbrella cavity, and effectively avoids the blockage of the mesh or micropores on the coating 220.

[0081] In this embodiment, each second branch rod 320 and the rib limiting ring 310 are preferably an integrally formed structure, for example, formed by cutting and shaping a metal pipe. Of course, each second branch rod 320 and the rib limiting ring 310 can also be formed separately and then fixed as a whole.

[0082] In the present invention, at least the second branch rod 320 is formed by shape memory alloys (SMA), for example, by laser cutting, sandblasting, electrolytic polishing, and heat treatment of nickel-titanium shape memory alloy. Of course, the rib stop ring 310 can also be formed by shape memory alloy (SMA). Since shape memory alloy (SMA) can automatically restore its own plastic deformation to its original shape at a certain temperature, the folding and unfolding of the rib 300 in the cavity is more convenient and smooth.

[0083] Combine the following Figure 1-3 , Figure 15-16 As shown, in one embodiment of the present invention, the distal embolic protection device 1 further includes a guide wire development spring 500, which is fixed to the distal end of the delivery guide wire 100. The guide wire development spring 500 is made of a metal material that is not transparent to X-rays, for example, gold, platinum, tungsten, or an alloy of at least two of the foregoing, but is certainly not limited to the foregoing materials. The guide wire development spring 500 is fixed to the distal end of the delivery guide wire 100 by laser welding, brazing, or other fixing methods.

[0084] Specifically, the delivery guide wire 100 is sequentially passed through the proximal stop ring 212 of the protective umbrella 200, the push spring 400, the endocardium skeleton 300, the distal stop ring 213 of the protective umbrella 200, and the inner cavity of the guide wire development spring 500, while ensuring that the delivery guide wire 100 is coaxial with the aforementioned components. The passing method between the delivery guide wire 100 and the aforementioned components is a conventional method in the art.

[0085] Combine the following Figure 15-16 As shown, in one embodiment of the present invention, the delivery guide wire 100 includes a grinding section 110, a coating section 120 and a guide wire tip 130. Among them, the guide wire tip 130 is arranged at the farthest end of the delivery guide wire 100, and the guide wire tip 130 has a smooth melt head, which plays a role in protecting the blood vessel wall. The guide wire development spring 500 is fixed to the far end of the delivery guide wire 100 and fits to the guide wire tip 130. In addition, the flexibility of the grinding section 110 is greater than the flexibility of the coating section 120, and the grinding section 110 and the coating section 120 are arranged at intervals. Specifically, the position where the guide wire development spring 500, the intracavitary umbrella rib 300, and the pusher spring 400 are fixed is the grinding section 110, and the remaining positions are the coating section 120. Therefore, under the premise of ensuring the pushing ability of the delivery guide wire 100, the delivery guide wire 100 has a softer distal structure, ensuring good bending ability in tortuous blood vessels and protecting the blood vessel wall.

[0086] In this embodiment, the delivery guide wire 100 is formed of a nickel-titanium shape memory alloy or a stainless steel wire. The grinding section 110 is ground by a grinder to form a plurality of cone sections, thereby having a softer distal structure while ensuring the pushing ability of the delivery guide wire 100. The coating section 120 is formed by coating the nickel-titanium shape memory alloy or the stainless steel wire with a plastic coating, and then coating a layer of hydrophilic coating or hydrophobic coating, so that the coating section 120 has better smoothness.

[0087] It is understandable that the delivery guidewire 100 can also be set to other structures. The delivery guidewire 100 is a conventional structure in the art and will not be described in detail.

[0088] Combine again below Figure 1-Figure 17 As shown, the working principle and state of the distal embolic protection device 1 of the present invention are explained.

[0089] When in use, the protective umbrella 200 of the distal embolic protection device 1 is first inserted into the blood vessel 2 and placed at the distal end of the blood flow of the lesion site, such as Fig.17 During the intervention, the protective umbrella 200 and the ribs 300 in the cavity are both in a folded state, and the guide wire development spring 500, the head end development ring 230, and the support development spring 240 can all mark the position of the protective umbrella 200 in the body, thereby facilitating the positioning of the protective umbrella 200 in the body. The process and method of intervention of the protective umbrella 200 are conventional in the art and will not be described in detail.

[0090] Combination Figure 1-3 , Fig.17 As shown, after the protective umbrella 200 is placed at the distal end of the blood flow of the lesion, the protective umbrella 200 and the intracavitary umbrella rib 300 are opened. Specifically, the support bracket 210 is changed from the compressed state to the expanded state, thereby driving the coating 220 attached to the support bracket 210 to open. During the expansion of the support bracket 210, the intracavitary umbrella rib 300 is unfolded accordingly, and the second opening 300a of the unfolded intracavitary umbrella rib 300 faces the cone portion 2221 of the coating 220, and the intracavitary umbrella rib 300 is located in the coating 220. In the aforementioned opening process, whether the protective umbrella 200 is fully unfolded and its position in the body can be visually observed through the bracket development spring 240, thereby providing guidance for subsequent operations.

[0091] Combination Figure 4-Figure 8As shown, when the protective umbrella 200 is fully opened, the protective umbrella 200 in the expanded state is in a fusiform structure, and its cylindrical section 210b is attached to the inner wall of the blood vessel 2, thereby increasing the wall-attaching area and enhancing its wall-attaching performance, so that the protective umbrella 200 is not easy to tilt. At the same time, the two first openings 210a at the proximal end of the protective umbrella 200 are symmetrically arranged along the central axis of the support bracket 210. Specifically, the two first openings 210a are arranged on both sides of the plane P1 passing through the two proximal connecting rods 2111, as shown in FIG. Figure 5 , Figure 8 As shown, in this way, even if the support bracket 210 is tilted, causing the first opening 210a on one side to be blocked by the wall of the blood vessel 2, the first opening 210a on the other side can still provide an effective capture channel equivalent to the cross-sectional area of ​​the entire blood vessel 2, thereby ensuring the effective capture of free thrombi. In addition, only two proximal connecting rods 2111 are provided between the two first openings 210a, so that there are fewer rods around the first openings 210a, reducing the interference of the rods at the entrance position on the thrombus, thereby improving the capture efficiency of the thrombus. Furthermore, the expanded intracavitary umbrella ribs 300 also increase the support of the protective umbrella 200, making the protective umbrella 200 less likely to tilt.

[0092] like Fig.17 As shown, during the interventional treatment, the protective umbrella 200 of the device is expanded and anchored on the inner wall of the blood vessel 2 to maintain the position of the delivery guide wire 100. The device plays the role of the delivery guide wire 100 during the operation, and the balloon 4 and the stent can be introduced according to the needs of the operation. The balloon 4 can be used to expand the lesion. Specifically, the balloon 4 can also be inserted into the lesion along the delivery guide wire 100 for expansion or stent implantation. In the process of the balloon 4 expanding the lesion, free free thrombus 3 is generated, and the free thrombus 3 is captured by the double-layer filtering structure composed of the intracavitary umbrella rib 300 and the protective umbrella 200. Specifically, as the blood flows, the blood and free thrombus 3 flow into the protective umbrella 200 from the first opening 210a, and the intracavitary umbrella rib 300 in the umbrella cavity first filters some large-sized free thrombus 3, and the small-sized free thrombus 3 enters the tapered section 210c of the protective umbrella 200 and is captured by the covering 220. At the same time, blood flows into the membrane 220 through the gaps on the intracavitary ribs 300 and the gaps between the intracavitary ribs 300 and the inner wall of the membrane 220, and then flows out through the holes 220a on the membrane 220, thereby providing sufficient cavities for the passage of blood. Compared with the single-layer filter structure in the prior art, the double-layer filter structure of the present application greatly improves the blockage of the mesh / micropores, thereby ensuring sufficient blood supply to the nervous system.

[0093] Recombination Figure 1-3 , Fig.17As shown, during the above-mentioned interventional treatment, the blood flow near the protective umbrella 200 will become slow, and there is not enough blood flow impulse to bring the free thrombus 3 into the interior of the protective umbrella 200, and the free thrombus 3 may be attached near the first opening 210a. At this time, the push spring 400 can be driven to generate a vortex by rotating the delivery guide wire 100, and the free thrombus 3 near the first opening 210a of the protective umbrella 200 can be pushed into the inner cavity of the protective umbrella 200, thereby further improving the capture efficiency.

[0094] After the treatment is completed, the support bracket 210 is changed from the expanded state to the compressed state. During this process, the support bracket 210 drives the film 220 attached thereto to shrink, and at the same time, the inner cavity ribs 300 are synchronously folded, and then the protective umbrella 200 is taken out of the body using the delivery guide wire 100. The process and method of folding and leading out the protective umbrella 200 are conventional methods in the art and will not be described in detail.

[0095] To summarize, according to the distal embolism protection device 1 of the present invention, a protective umbrella 200 and an intracavitary umbrella rib 300 are coaxially arranged on the delivery guide wire 100, wherein the protective umbrella 200 includes a supporting bracket 210 and a coating 220 fixed to the distal end of the supporting bracket 210 and attached to the outside of the supporting bracket 210, and a plurality of holes 220a are opened on the coating 220, and a layer of filtering structure is formed by the supporting bracket 210 and the coating 220, and the intracavitary umbrella rib 300 is fixed in the supporting bracket 210 and has a hollow structure, thereby forming another layer of filtering structure. The double-layer filtering structure of the present application has the following effects: first, some large-sized free thrombi are filtered by the intracavitary ribs 300, and then the small-sized free thrombi are captured by the covering film 220, thereby effectively improving the accumulation of thrombus clots in the inner cavity of the protective umbrella 200, reducing the probability of clogging of the mesh / micropores of the protective umbrella 200, and providing a cavity for the passage of blood flow, thereby ensuring sufficient blood supply to the nervous system; secondly, the support bracket 210 and the intracavitary ribs 300 are coaxially arranged with the delivery guide wire 100, which strengthens the support of the protective umbrella 200, so that the support bracket 210 does not It is easy to tilt, which improves the stability of the protective umbrella 200 in the blood vessel 2 and ensures the effective capture of free thrombi. Furthermore, the setting of the two first openings 210a not only reduces the interference of the opening position of the protective umbrella 200 on the thrombus, but also greatly improves the capture efficiency of free thrombi on the basis of the coaxial structure. Even if the protective umbrella 200 is tilted and the first opening 210a on one side is blocked by the wall of the blood vessel 2, the first opening 210a on the other side can still provide an effective capture channel equivalent to the cross-sectional area of ​​the entire blood vessel 2, further ensuring the capture efficiency of free thrombi.

[0096] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of rights of the present invention. Equivalent changes made according to the scope of the patent application are still within the scope covered by the present invention.

Claims

1. A distal embolic protection device, characterized in that: include: Delivery guide wire; A protective umbrella, comprising a support bracket and a coating, wherein the support bracket is a hollow structure and has two first openings at the proximal end, the two first openings are symmetrically arranged along the central axis of the support bracket, the support bracket is coaxially penetrated on the delivery guide wire, and the support bracket has a compression state and an expansion state, the coating is fixed to the distal end of the support bracket and fits outside the support bracket, the coating wraps a part of the support bracket, the coating can shrink and expand with the support bracket, and a plurality of holes are opened on the coating; The intracavity umbrella rib has a hollow structure and has a second opening. The intracavity umbrella rib is coaxially fixed to the delivery guide wire and is located in the support bracket. The second opening faces the distal end of the support bracket. The intracavity umbrella rib can be folded and unfolded with the support bracket.

2. The distal embolic protection device according to claim 1, characterized in that: The first opening is in a shuttle shape or a wedge shape, the length direction of each first opening is the same as the axial direction of the central axis of the support stent, and the surface where each first opening is located forms an angle with the cross-section of the blood vessel.

3. The distal embolic protection device according to claim 1, characterized in that: The support bracket includes a coaxially arranged cylindrical section and conical sections arranged at both ends of the cylindrical section, and the first opening is formed in one of the conical sections.

4. The distal embolic protection device according to claim 1, characterized in that: The support bracket includes a coaxially arranged proximal limit ring, a distal limit ring and a plurality of first branch rods connected therebetween. The plurality of first branch rods are staggered to form a mesh hollow structure. The proximal limit ring and the distal limit ring are respectively sleeved outside the delivery guide wire.

5. The distal embolic protection device according to claim 4, characterized in that: The protective umbrella also includes a head end developing sleeve ring, which is coaxially sleeved outside the distal end limiting ring, so as to press the coating tightly between the head end developing sleeve ring and the distal end limiting ring.

6. The distal embolic protection device according to claim 5, characterized in that: The protective umbrella also includes two bracket developing springs, which are fixed on the supporting bracket and symmetrically arranged along the central axis of the supporting bracket, and the connecting line of the head end developing ring and the two bracket developing springs forms an isosceles triangle.

7. The distal embolic protection device according to any one of claims 1 to 6, characterized in that: In the direction from the distal end to the proximal end along the central axis of the support bracket, the apertures of the holes on the coating gradually increase, and in the same cross section perpendicular to the central axis of the support bracket, the apertures of the holes are the same.

8. The distal embolic protection device according to any one of claims 1 to 6, characterized in that: The covering film comprises a distal ring and an umbrella cap fixed to the distal ring, the distal ring is fixed to the distal end of the supporting bracket, and the umbrella cap is attached to the outside of the supporting bracket.

9. The distal embolic protection device according to claim 8, characterized in that: The umbrella cover comprises a cone portion and a cylindrical portion, the tip of the cone portion is fixed to the distal ring, and the hole is at least opened in the cone portion.

10. The distal embolic protection device according to any one of claims 1 to 6, characterized in that: The intra-cavity umbrella rib comprises an umbrella rib limiting ring and a plurality of second branches, each of the second branches is fixed to the umbrella rib limiting ring at intervals along the circumference thereof, one end of each of the second branches away from the umbrella rib limiting ring forms the second opening, and the umbrella rib limiting ring is coaxially fixed to the delivery guide wire.

11. The distal embolic protection device according to any one of claims 1 to 6, characterized in that: The outer diameter of the in-cavity umbrella rib when unfolded is smaller than the inner diameter of the supporting bracket when in the expanded state.

12. The distal embolic protection device according to any one of claims 1 to 6, characterized in that: It also includes a push spring, which is fixed to the delivery guide wire and is located between the proximal end of the intracavitary umbrella rib and the proximal end of the support bracket.

13. The distal embolic protection device according to claim 12, characterized in that: It also includes a guide wire development spring, which is fixed to the distal end of the conveying guide wire; the conveying guide wire includes a grinding section and a coating section, the flexibility of the grinding section is greater than the flexibility of the coating section, and the guide wire development spring, the intracavitary rib, and the push spring are all fixed to the grinding section.

Images