A remote protection device

Abstract

This application relates to the field of medical device technology, specifically to a distal protection device, including a filter and a support stent. The proximal end of the support stent has an opening, and the support stent includes a column segment. The distal end of the column segment is connected to the proximal opening of the filter. The radial dimension of the support stent is adjustable and has an expanded state and a contracted state. In the expanded state, the radial dimension of the column segment is not less than the radial dimension of the proximal opening of the filter. In this distal protection device, the support stent is connected to the proximal opening of the filter. In the expanded state, the radial dimension of the column segment is not less than the radial dimension of the proximal opening of the filter. The column segment adheres to the inner wall of the blood vessel. Compared to related technologies that rely solely on a support ring to provide radial force, the column segment can provide greater radial support force, significantly improving the adhesion performance between the filter and the inner wall of the blood vessel, reducing the risk of thrombus escape from between the proximal opening of the filter and the inner wall of the blood vessel. This makes the distal protection device suitable for the treatment of vascular lesions with severe plaque and calcification.

Description

Technical Field

[0001] This application relates to the field of medical device technology, specifically to a remote protection device. Background Technology

[0002] Related distal protection devices include a filter screen with a support ring at its proximal opening. This support ring provides radial force between the proximal opening of the filter screen and the inner wall of the blood vessel when the filter screen is open, improving the adhesion between the filter screen and the vessel wall. However, the radial force provided by the support ring is relatively small. For blood vessels with severe plaque or calcification, such as lower limb arteries, the adhesion is poor, and thrombi can easily escape. Summary of the Invention

[0003] The purpose of this application is to provide a remote protection device that solves the problem of poor wall adhesion and easy thrombus escape. The specific solution is as follows:

[0004] A remote protection device includes a filter and a support bracket. The support bracket has an opening at its proximal end. The support bracket includes a column segment, the distal end of which is connected to the proximal opening of the filter. The radial dimension of the support bracket is adjustable and has an expanded state and a contracted state. In the expanded state, the radial dimension of the column segment is not less than the radial dimension of the proximal opening of the filter.

[0005] Optionally, the distal end of the column segment includes a plurality of circumferentially distributed support portions, each support portion including a first support rod and a second support rod. In the same support portion, the distal ends of the first support rod and the second support rod are connected to each other. From the distal end of the support portion to the proximal end of the support portion, the first support rod and the second support rod extend in a direction away from each other.

[0006] In two adjacent support portions, the proximal ends of the first support rod of one support portion and the second support rod of the other support portion are connected to each other; the first support rod is provided with a first connecting hole, and the second support rod is provided with a second connecting hole;

[0007] The filter screen includes a woven mesh, which is formed by multiple braided threads and connected to the same support part and three of the braided threads, wherein: one braided thread passes through the first connecting hole, one braided thread passes through the second connecting hole, and one braided thread passes between the first support rod and the second support rod.

[0008] Optionally, the first support rod includes a first support rod segment, the minimum width of the first support rod segment is greater than the width of other parts of the first support rod, and the first connecting hole is disposed in the first support rod segment;

[0009] The second support rod includes a second support rod segment, the minimum width of which is greater than the width of other parts of the second support rod, and the second connecting hole is provided in the second support rod segment.

[0010] Optionally, the side wall of the first support rod segment facing the braided thread along the width direction is arc-shaped, and the side wall of the second support rod segment facing the braided thread along the width direction is arc-shaped.

[0011] Optionally, the diameter of the braided thread ranges from 0.03mm to 0.2mm.

[0012] Optionally, the length of the filter screen is in the range of 10mm-50mm.

[0013] Optionally, the support bracket further includes a retrieval section connected to the proximal end of the column segment, the retrieval section comprising a plurality of circumferentially distributed retrieval units, the retrieval unit comprising:

[0014] Multiple connecting portions are distributed along the proximal end to the distal end of the recycling unit. The connecting portion closest to the proximal end of the recycling unit is the first connecting portion. The k-th connecting portion includes k connecting units distributed circumferentially, k=1,2,3… Each connecting unit includes a first rod and a second rod. The proximal ends of the first rod and the second rod are connected to each other. From the proximal end to the distal end of the connecting unit, the first rod and the second rod extend in a direction away from each other. In two adjacent connecting units, the distal ends of the first rod of one connecting unit and the second rod of the other connecting unit are connected to each other. In the multiple recycling units, the distal ends of the multiple connecting portions near the column segment are connected circumferentially to form a ring structure.

[0015] The proximal end of the kth connecting part has k first connecting nodes, the distal end of the kth connecting part has k+1 second connecting nodes, and the proximal end of the column segment has multiple third connecting nodes. The second connecting nodes of the connecting parts near the column segment and the third connecting nodes of the column segment are connected accordingly. Except for the connecting parts near the column segment, the second connecting nodes of the kth connecting part and the first connecting nodes of the k+1th connecting part are connected accordingly.

[0016] Optionally, the distal protection device further includes a guide wire, and the retrieval section further includes multiple retrieval rods. The distal end of each retrieval rod is connected to the first connection node of the first connection portion. The proximal ends of the retrieval rods are connected to each other and to the guide wire. An opening is formed between two adjacent retrieval rods. The axis of the guide wire does not coincide with the axis of the support bracket.

[0017] Optionally, the remote protection device further includes:

[0018] A fixing part is connected to the proximal end of the recovery rod;

[0019] A limiting retaining ring is connected to the fixing part, and the guide wire passes through the limiting retaining ring.

[0020] Optionally, the filter screen is made of nickel-titanium alloy;

[0021] And / or, the support bracket is made of nickel-titanium alloy.

[0022] The technical effects of this application are as follows:

[0023] This application's distal protection device connects a support stent to the proximal opening of the filter. In the inflated state, the proximal opening of the filter adheres to the vessel wall via the column segment of the support stent. Compared to related technologies where distal protection devices rely solely on the support ring for radial force, the column segment provides greater radial support, significantly improving the adhesion between the filter and the vessel wall, and reducing the risk of thrombus escape from between the proximal opening of the filter and the vessel wall. This distal protection device is suitable for treating vascular lesions with severe plaque and calcification. The radial dimension of the support stent is adjustable and it has both inflated and contracted states, ensuring stable support of the stent to the vessel wall during treatment while also facilitating... The delivery and retrieval of the distal protection device avoids additional damage to the inner wall of the blood vessel. This application uses a filter to filter and intercept thrombi in the blood, and the filter and the support stent are connected at the ends. After release, the filter and the support stent are independent of each other in the axial direction, so the filter has better flexibility and greater elasticity. When the filter captures thrombi, it has a larger space that is not restricted by the structure of the support stent, and can accommodate a sufficient number of thrombi. During retrieval, the support stent first retracts into the catheter, and the proximal opening of the filter quickly closes, wrapping the thrombus inside. The filter can be stretched significantly when it enters the catheter, avoiding the problem of thrombus escape during retrieval. Attached Figure Description

[0024] Figure 1 A schematic diagram of a specific embodiment of the remote protection device provided in this application;

[0025] Figure 2 A schematic diagram of another specific embodiment of the remote protection device provided in this application;

[0026] Figure 3 for Figure 1 A schematic diagram of the support bracket in the deployed state of the remote protection device;

[0027] Figure 4 for Figure 1A partial structural diagram of the connection between the support bracket and the filter screen in the remote protection device;

[0028] Figure 5 for Figure 1 Schematic diagram of the support bracket in the remote protection device;

[0029] Figure 6 for Figure 1 and Figure 2 A schematic diagram of the structure at the fixing point of the developing ring and the braided thread;

[0030] Figure 7 for Figure 1 Schematic diagram of the guidewire in the remote protection device;

[0031] Figure 8 for Figure 7 Enlarged view of region A in the middle;

[0032] Figure 9 This is a schematic diagram of a specific embodiment of the catheter provided in this application;

[0033] Explanation of reference numerals in the attached figures:

[0034] Filter screen 1; woven mesh 11; braided thread 1-1; developing ring 12; inner developing ring 121; outer developing ring 122;

[0035] Support bracket 2; opening 2a; column segment 21; support segment 21-1; support part 211; first support rod 2111; first support rod segment 2111-1; first connecting hole 2-1; second support rod 2112; second support rod segment 2112-1; second connecting hole 2-2; straight connecting rod 212;

[0036] Recycling section 22; Recycling unit 221; Connecting part 2211; Connecting unit 2211-1; First rod 2211-11; Second rod 2211-12; First connecting node O1; Second connecting node O2; Third connecting node O3; Recycling rod 222;

[0037] Guide wire 3; main body section 31; equal diameter section 311; variable diameter section 312; notch 313; nickel-titanium section 32; soft spring section 33; stainless steel threaded connecting pipe 34;

[0038] 4. Conduit; 41. Transport section; 411. Transparent section; 412. Quick exchange port for guide wire; 413. Quick exchange port for filter screen; 42. Solid section; 43. Recovery tube section; 431. Guide wire hole;

[0039] Fixing part 5. Detailed Implementation

[0040] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0042] It should be understood that the phrase "some embodiments" throughout the specification means that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "some embodiments" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0043] In this description, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.

[0044] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of a specific embodiment of the remote protection device provided in this application; Figure 2 This is a schematic diagram of another specific embodiment of the remote protection device provided in this application.

[0045] This application provides a remote protection device, including a filter screen 1 and a support bracket 2. The proximal end of the support bracket 2 has an opening 2a. The support bracket 2 includes a column segment 21. The distal end of the column segment 21 is connected to the proximal opening of the filter screen 1. The radial dimension of the support bracket 2 is adjustable and has an expanded state and a contracted state. In the expanded state, the radial dimension of the column segment 21 is not less than the radial dimension of the proximal opening of the filter screen 1.

[0046] Depend on Figure 1 As can be seen, the distal protection device in this embodiment of the application also includes a guidewire 3. The distal end of the filter 1 and the proximal end of the support stent 2 are both installed on the guidewire 3. During the operation, the filter 1 and the support stent 2 are delivered to the distal end of the blood flow at the lesion site using the catheter and the guidewire 3. During the intervention, the filter 1 and the support stent 2 are located inside the catheter, and the support stent 2 is in a contracted state.

[0047] Once the filter 1 and support stent 2 are located distal to the blood flow at the lesion site, the catheter is withdrawn, and the filter 1 and support stent 2 are released. The support stent 2 will change from a contracted state to an expanded state, with the column segment 21 adhering to the inner wall of the blood vessel. Since the radial dimension of the column segment 21 is not less than the radial dimension of the proximal opening of the filter 1 in the expanded state, the column segment 21 adhering to the inner wall of the blood vessel allows the proximal opening of the filter 1 to also be completely adhered to the inner wall of the blood vessel, giving the proximal opening of the filter 1 good wall adhesion and increasing the wall adhesion area. The proximal end of the support stent 2 has an opening 2a, which ensures that thrombi in the blood enter the filter 1 through the opening 2a of the support stent 2 for filtration and interception, minimizing the possibility of thrombi escaping between the proximal opening of the filter 1 and the inner wall of the blood vessel, causing downstream vascular blockage. At the same time, the filter 1 has several filtration pores to ensure normal blood flow.

[0048] After the treatment is completed, filter 1 and support stent 2 are retracted into the catheter. Support stent 2 changes from an expanded state to a contracted state. The catheter and the entire distal protection device (including the captured thrombus) are slowly withdrawn from the body to complete the surgical procedure.

[0049] As can be seen, in this embodiment of the distal protection device, a support stent 2 is connected to the proximal opening of the filter 1. In the expanded state, the proximal opening of the filter 1 adheres to the inner wall of the blood vessel through the column segment 21 of the support stent 2. Compared with the distal protection device of the related technology that only relies on the support ring to provide radial force, the column segment 21 can provide greater radial support force, which greatly improves the adhesion performance between the filter 1 and the inner wall of the blood vessel and reduces the risk of thrombus escaping from the proximal opening of the filter 1 and the inner wall of the blood vessel. This makes the distal protection device of this embodiment suitable for the treatment of blood vessels with severe plaque and calcification lesions. The radial dimension of the support stent 2 is adjustable and has an expanded state and a contracted state. This ensures the stable support of the support stent 2 to the inner wall of the blood vessel during treatment and facilitates the delivery and retrieval of the distal protection device, avoiding additional damage to the inner wall of the blood vessel.

[0050] Furthermore, in this embodiment, a filter 1 is used to filter and intercept thrombi in the blood. The filter 1 and the support stent 2 are connected at the ends. After release, the filter 1 and the support stent 2 are independent of each other in the axial direction, so the filter 1 has better flexibility and greater elasticity. When the filter 1 captures thrombi, it has a larger space that is not restricted by the structure of the support stent 2, and can accommodate a sufficient number of thrombi. During retrieval, the support stent 2 first retracts into the catheter, and the proximal opening of the filter 1 closes quickly, wrapping the thrombus inside. The filter 1 can be stretched significantly when it enters the catheter, avoiding the problem of thrombus escape during retrieval.

[0051] Please refer to Figures 3-4 , Figure 3 for Figure 1 A schematic diagram of the support bracket in the deployed state of the remote protection device; Figure 4 for Figure 1 A partial structural diagram of the connection between the support bracket and the filter screen in the remote protection device.

[0052] In this embodiment of the application, the distal end of the column segment 21 includes a plurality of circumferentially distributed support portions 211. Each support portion 211 includes a first support rod 2111 and a second support rod 2112. In the same support portion 211, the distal ends of the first support rod 2111 and the second support rod 2112 are connected to each other. From the distal end of the support portion 211 to the proximal end of the support portion 211, the first support rod 2111 and the second support rod 2112 extend in a direction away from each other.

[0053] In two adjacent support parts 211, the proximal ends of the first support rod 2111 of one support part 211 and the second support rod 2112 of the other support part 211 are connected to each other; the first support rod 2111 is provided with a first connecting hole 2-1, and the second support rod 2112 is provided with a second connecting hole 2-2.

[0054] The filter screen 1 includes a woven mesh 11, which is formed by multiple braided threads 1-1. The same support part 211 is connected to three braided threads 1-1, wherein: one braided thread 1-1 passes through the first connecting hole 2-1, one braided thread 1-1 passes through the second connecting hole 2-2, and one braided thread 1-1 passes between the first support rod 2111 and the second support rod 2112.

[0055] As described above, in this embodiment, the support 211 is a V-shaped structure composed of a first support rod 2111 and a second support rod 2112. This V-shaped structure allows the support bracket 2 to better switch between an expanded state and a contracted state, achieving radial dimension adjustment. At the same time, the closed end of the support 211 faces the distal end. Each support 211 can provide three connection points for the braided thread 1-1. After the three braided threads 1-1 pass through the first connection hole 2-1, the second connection hole 2-2, and between the first support rod 2111 and the second support rod 2112, they can form six connection ends. Multiple support 211 together form dense filter connection points in the circumferential direction, optimizing the braided structure of the filter 1, making the structure of the proximal opening of the filter 1 more regular, and improving the connection reliability between the filter 1 and the column segment 21. This minimizes the risk of local failure due to too few connection points and minimizes the possibility of thrombus escaping from the connection between the filter 1 and the column segment 21.

[0056] Please continue to refer to this. Figure 3 In this embodiment of the application, the column segment 21 includes a plurality of support segments 21-1 distributed along the axial direction, and each support segment 21-1 includes a plurality of support parts 211 distributed along the circumferential direction. The support parts 211 in the support segment 21-1 near the far end are used to connect with the filter screen 1.

[0057] At the same time, such as Figure 3 As shown in the embodiment of this application, the support segment 21-1 has a sine wave structure. In two adjacent support segments 21-1, the peak of one support segment 21-1 and the trough of the other support segment 21-1 are opposite to each other and are connected by a straight connecting rod 212.

[0058] The number of support segments 21-1 included in column segment 21 is not limited. In some embodiments of this application, the number of support segments 21-1 included in column segment 21 is 2-8.

[0059] The number of support segments 21-1 in column segment 21 determines the support length of column segment 21. If the number of support segments 21-1 is less than 2, the support length of column segment 21 is shorter, which will reduce the radial support force and wall adhesion performance of column segment 21. If the number of support segments 21-1 is greater than eight, the support length of column segment 21 is longer, which will not only affect the length of the conduit, but also the radial support force and wall adhesion performance of column segment 21. Therefore, the number of support segments 21-1 has the above-mentioned range. In practical applications, if the radial support force of column segment 21 is to reach the expected value range, it is necessary to control the size of column segment 21 by adjusting the original size or by polishing.

[0060] The number of support parts 211 included in each support segment 21-1 is not limited. In some embodiments of this application, the number of support parts 211 included in each support segment 21-1 is 6-10.

[0061] The number of support parts 211 in the support segment 21-1 determines the outer diameter of the column segment 21. If the number of support parts 211 in the support segment 21-1 is less than six, the expandable diameter of the column segment 21 will be small, resulting in uneven expansion. If the number of support parts 211 in the support segment 21-1 is greater than ten, although the column segment 21 can expand to the required diameter, the expansion angle of each support part 211 will be small, resulting in a large initial radial support force generated by the column segment 21. To achieve the expected radial support force, the width of the support rod needs to be reduced, leading to a decrease in the structural strength of the support rod and potential breakage under blood flow impact. Therefore, the number of support parts 211 in the support segment 21-1 falls within the above range to ensure that both the expandable diameter of the column segment 21 and the expansion angle of the support parts 211 reach the expected range.

[0062] Please continue to refer to this. Figure 4 In this embodiment of the application, the first support rod 2111 includes a first support rod segment 2111-1, the maximum width of the first support rod segment 2111-1 is greater than the width of other parts of the first support rod 2111, and the first connecting hole 2-1 is provided in the first support rod segment 2111-1;

[0063] The second support rod 2112 includes a second support rod segment 2112-1. The maximum width of the second support rod segment 2112-1 is greater than the width of other parts of the second support rod 2112. The second connecting hole 2-2 is provided in the second support rod segment 2112-1.

[0064] As described above, in this embodiment of the application, the first support rod 2111 is locally widened at the location where the first connecting hole 2-1 is provided, to provide a larger processing space for the first connecting hole 2-1, enhance the structural strength of the first support rod 2111 in the connection area, ensure the connection reliability between the filter screen 1 and the first support rod 2111, reduce the risk of connection failure between the filter screen 1 and the first support rod 2111, and minimize the possibility of thrombus escaping from the connection between the filter screen 1 and the column segment 21.

[0065] Similarly, in this embodiment, the second support rod 2112 is locally widened at the location where the second connecting hole 2-2 is provided, providing more processing space for the second connecting hole 2-2, enhancing the structural strength of the second support rod 2112 in the connection area, ensuring the connection reliability of the filter screen 1 and the second support rod 2112, reducing the risk of connection failure of the filter screen 1 and the second support rod 2112, and minimizing the possibility of thrombus escaping from the connection between the filter screen 1 and the column segment 21.

[0066] In this embodiment, the diameters of the first connecting hole 2-1 and the second connecting hole 2-2 should not be less than the diameter of the braided wire 1-1, ensuring that the braided wire 1-1 can pass smoothly through the interior of the first connecting hole 2-1 and the second connecting hole 2-2. At the same time, the diameters of the first connecting hole 2-1 and the second connecting hole 2-2 should also be adaptively designed according to the width of the first support rod 2111 and the second support rod 2112, ensuring that the first support rod 2111 and the second support rod 2112 have sufficient structural strength in the connection area, and minimizing the risk of connection failure between the filter screen 1 and the first support rod 2111.

[0067] Please continue to refer to this. Figure 4 In this embodiment of the application, the side wall of the first support rod segment 2111-1 facing the braided thread 1-1 along the width direction is arc-shaped, and the side wall of the second support rod segment 2112-1 facing the braided thread 1-1 along the width direction is arc-shaped.

[0068] As configured above, the side wall of the first support rod segment 2111-1 facing the braided thread 1-1 along the width direction is arc-shaped, and the side wall of the second support rod segment 2112-1 facing the braided thread 1-1 along the width direction is arc-shaped. When the support stent 2 is attached to the inner wall of the blood vessel, the smooth arc-shaped contour can reduce the stimulation and damage to the inner wall of the blood vessel and improve the safety of the operation. At the same time, the smooth arc-shaped contour can also reduce the wear of the braided thread 1-1 during long-term use, ensure the reliability of the connection between the filter 1 and the support stent 2, and reduce the risk of damage to the function of the filter 1 due to the wear and failure of the braided thread 1-1.

[0069] In this embodiment of the application, the diameter of the braided thread 1-1 ranges from 0.03mm to 0.2mm.

[0070] Verification showed that if the diameter of the braided thread 1-1 is less than 0.03 mm, it is too thin and the filter 1 is prone to breakage under the impact of blood flow within the blood vessel; if the diameter of the braided thread 1-1 is greater than 0.2 mm, it is too thick and exerts excessive force on the blood vessel. Therefore, the diameter of the braided thread 1-1 falls within the above range, ensuring that it has sufficient structural strength to prevent breakage under the impact of blood flow while also ensuring that the force exerted on the blood vessel by the filter 1 is within a suitable range.

[0071] In this embodiment, the material of the support bracket 2 includes, but is not limited to, nickel-titanium alloy, which makes the transition between the expansion and contraction states of the support bracket 2 more convenient and smoother.

[0072] In this embodiment, the material of filter 1 includes, but is not limited to, nickel-titanium alloy, which makes the release or retraction of filter 1 smoother.

[0073] In this embodiment of the application, the length of the filter 1 ranges from 10mm to 50mm.

[0074] The function of filter 1 is to intercept detached blood clots during surgery. If the length of filter 1 is less than 10mm, it is too short, its capacity is too small, and its interception efficiency is low, easily causing blockage. If the length of filter 1 is greater than 50mm, it is too long, requiring sufficient space at the distal end of the blood flow in the lesion site to deploy it. This is difficult to meet in some vascular conditions, resulting in a narrow applicability of the distal protection device. Therefore, in this embodiment, the length of filter 1 has the above-mentioned range, ensuring the interception efficiency of filter 1 against blood clots and avoiding blockage, while also being suitable for vascular conditions in different locations, thus broadening the applicability of the distal protection device in this embodiment.

[0075] Please refer to Figure 3 and Figure 5 , Figure 5 for Figure 1 A schematic diagram of the support bracket in the remote protection device.

[0076] In this embodiment, the support bracket 2 further includes a retrieval section 22 connected to the proximal end of the column segment 21. The retrieval section 22 includes a plurality of retrieval unit bodies 221 distributed circumferentially. Each retrieval unit body 221 includes:

[0077] Multiple connecting portions 2211 are distributed along the proximal end to the distal end of the recovery unit body 221. The connecting portion 2211 closest to the proximal end of the recovery unit body 221 is the first connecting portion 2211. The k-th connecting portion 2211 includes k connecting units 2211-1 distributed circumferentially, k=1,2,3… Each connecting unit 2211-1 includes a first rod 2211-11 and a second rod 2211-12. The proximal ends of the first rod 2211-11 and the second rod 2211-12 are connected to each other by the connecting unit 221. In the direction from the proximal end of 1-1 to the distal end of the connecting unit 2211-1, the first rod 2211-11 and the second rod 2211-12 extend in a direction away from each other. In two adjacent connecting units 2211-1 of the same connecting part 2211, the distal ends of the first rod 2211-11 of one connecting unit 2211-1 and the distal ends of the second rod 2211-12 of the other connecting unit 2211-1 are connected to each other. In the multiple recycling unit bodies 221, the distal ends of the multiple connecting parts 2211 near the column segment 21 are connected to each other in the circumferential direction to form a ring structure.

[0078] The proximal end of the kth connecting part 2211 has k first connecting nodes O1, the distal end of the kth connecting part 2211 has k+1 second connecting nodes O2, and the proximal end of the column segment 21 has multiple third connecting nodes O3. The second connecting nodes O2 of the connecting part 2211 near the column segment 21 and the third connecting nodes O3 of the column segment 21 are connected accordingly. Except for the connecting part 2211 near the column segment 21, the second connecting nodes O2 of the kth connecting part 2211 and the first connecting nodes O1 of the k+1th connecting part 2211 are connected accordingly.

[0079] As set above, in this embodiment of the application, each recovery unit 221 adopts a topology network in which the number of structural units and the number of connection nodes increase progressively from the proximal end to the distal end. The second connection node O2 of the connection part 2211 near the column segment 21 and the third connection node O3 of the column segment 21 are connected accordingly. Except for the connection part 2211 near the column segment 21, the second connection node O2 of the kth connection part 2211 and the first connection node O1 of the (k+1)th connection part 2211 are connected accordingly. That is, each connection node has a corresponding connection node connected to each other, so that the recovery segment 22 can adhere to the inner wall of the blood vessel in a more uniform surface contact manner, avoiding the existence of independent nodes from irritating the inner wall of the blood vessel.

[0080] Depend on Figure 2 As can be seen from the embodiments of this application, the support segment 21-1 includes six support parts 211, and the proximal end of each support part 211 has six third connection nodes O3. The recycling segment 22 includes two recycling unit bodies 221, and each recycling unit body 221 includes three connection parts 2211. The proximal end of the first connection part 2211 has one first connection node O1, and the distal end of the first connection part 2211 has two second connection nodes O2. The proximal end of the second connection part 2211 has two first connection nodes O1, and the distal end of the second connection part 2211 has three second connection nodes O2. The proximal end of the third connection part 2211 has three first connection nodes O1, and the third... The distal end of the connecting portion 2211 has four second connecting nodes O2. Two second connecting nodes O2 at the distal end of the first connecting portion 2211 are correspondingly connected to two first connecting nodes O1 at the proximal end of the second connecting portion 2211. Three second connecting nodes O2 at the distal end of the second connecting portion 2211 are correspondingly connected to three first connecting nodes O1 at the proximal end of the third connecting portion 2211. In the two recovery units 221, the distal ends of the third connecting portion 2211 are interconnected circumferentially to form a ring structure. The distal end of this ring structure has six second connecting nodes O2, which are correspondingly connected to six third connecting nodes O3 at the proximal end of the support portion 211. Thus, each connecting node in the recovery section 22 is interconnected with a corresponding connecting node, and the presence of no independent node causes irritation to the vascular wall.

[0081] In other embodiments of this application, the support segment 21-1 includes nine support portions 211, each support portion 211 having nine third connection nodes O3 at its proximal end. The recycling segment 22 includes three recycling unit bodies 221, each recycling unit body 221 including three connection portions 2211. The proximal end of the first connection portion 2211 has one first connection node O1, and the distal end of the first connection portion 2211 has two second connection nodes O2. The proximal end of the second connection portion 2211 has two first connection nodes O1, and the distal end of the second connection portion 2211 has three second connection nodes O2. The proximal end of the third connection portion 2211 has three first connection nodes O1, and the third... The distal end of the connecting portion 2211 has four second connecting nodes O2. Two second connecting nodes O2 at the distal end of the first connecting portion 2211 are correspondingly connected to two first connecting nodes O1 at the proximal end of the second connecting portion 2211. Three second connecting nodes O2 at the distal end of the second connecting portion 2211 are correspondingly connected to three first connecting nodes O1 at the proximal end of the third connecting portion 2211. In the three recovery units 221, the distal ends of the third connecting portion 2211 are interconnected circumferentially to form a ring structure. The distal end of this ring structure has nine second connecting nodes O2, which are correspondingly connected to nine third connecting nodes O3 at the proximal end of the support portion 211. Thus, each connecting node in the recovery section 22 is interconnected with a corresponding connecting node, and the presence of no independent nodes causes irritation to the vascular wall.

[0082] In other embodiments of this application, the support segment 21-1 includes eight support portions 211, each support portion 211 having eight third connection nodes O3 at its proximal end. The retrieval segment 22 includes two retrieval unit bodies 221, each retrieval unit body 221 including four connection portions 2211. The proximal end of the first connection portion 2211 has one first connection node O1, and the distal end of the first connection portion 2211 has two second connection nodes O2. The proximal end of the second connection portion 2211 has two first connection nodes O1, and the distal end of the second connection portion 2211 has three second connection nodes O2. The proximal end of the third connection portion 2211 has three first connection nodes O1, and the distal end of the third connection portion 2211 has four second connection nodes O2. The proximal end of the fourth connection portion 2211 has four first connection nodes O1, and the fourth connection portion 2211 has four first connection nodes O1. The distal end of the first connecting part 2211 has five second connecting nodes O2. Two second connecting nodes O2 at the distal end of the first connecting part 2211 are connected to two first connecting nodes O1 at the proximal end of the second connecting part 2211. Three second connecting nodes O2 at the distal end of the second connecting part 2211 are connected to three first connecting nodes O1 at the proximal end of the third connecting part 2211. Four second connecting nodes O2 at the distal end of the third connecting part 2211 are connected to four first connecting nodes O1 at the proximal end of the fourth connecting part 2211. In the two recovery units 221, the distal ends of the fourth connecting part 2211 are interconnected circumferentially to form a ring structure. The distal end of this ring structure has eight second connecting nodes O2, which are connected to eight third connecting nodes O3 at the proximal end of the support part 211. Thus, each connecting node in the recovery section 22 is interconnected with a corresponding connecting node, and the presence of no independent node causes irritation to the vascular wall.

[0083] Please continue to refer to this. Figure 1 , Figure 3 and Figure 5 In this embodiment of the application, the remote protection device further includes a guide wire 3, and the retrieval section 22 further includes a plurality of retrieval rods 222. The distal end of the retrieval rod 222 is connected to the first connection node O1 of the first connection part 2211. The proximal ends of the retrieval rods 222 are connected to each other and connected to the guide wire 3. An opening 2a is formed between two adjacent retrieval rods 222. The axis of the guide wire 3 and the axis of the support bracket 2 do not coincide.

[0084] As set up above, the proximal end of the retrieval section 22 is connected to the guidewire 3 via the retrieval rod 222, which facilitates the retrieval of the filter 1 and the support stent 2 into the catheter after treatment, making the retrieval process smoother; the axis of the guidewire 3 and the axis of the support stent 2 do not coincide, reducing the obstruction of the thrombus by the retrieval rod 222 at the opening of the support stent 2 and improving the capture efficiency of the thrombus stent.

[0085] In this embodiment, there are two retrieval units 221 and two retrieval rods 222. The minimum number of retrieval rods 222 minimizes the interference of the retrieval rods 222 on the thrombus and maximizes the capture efficiency of the thrombus stent.

[0086] The angle between two adjacent retrieval rods 222 needs to be designed, and should not be too large or too small. If it is too large, it will be difficult to retrieve the support stent 2 to the catheter, reducing the convenience of retrieval. If it is too small, the length of the retrieval section 22 will be too long, requiring sufficient space at the distal end of the blood flow in the lesion site to deploy the support stent 2. Some vascular conditions may not meet this requirement, resulting in a narrow range of applicability of the distal protection device.

[0087] Please continue to refer to this. Figure 3 In this embodiment of the application, the remote protection device further includes:

[0088] The fixing part 5 is connected to the proximal end of the recovery rod 222;

[0089] A limiting ring (not shown in the figure) is connected to the fixing part 5, and the guide wire 3 passes through the limiting ring.

[0090] As set above, the fixing part 5 is used to provide the connection position of the limiting ring. The limiting ring is connected to the fixing part 5 to realize the connection between the retrieval rod 222 and the guide wire 3, so that the filter 1 and the support bracket 2 can be retracted into the catheter after the treatment is completed, making the retrieval process smoother.

[0091] The connection method between the limiting ring and the fixing part 5 is not limited; for example, the two can be fixed by welding or bonding.

[0092] In some other embodiments of this application, the limiting ring and the recovery rod 222 can be integrally formed.

[0093] The inner diameter of the retaining ring must be larger than the outer diameter of the guide wire so that the guide wire and the retaining ring can move relative to each other.

[0094] Please refer to Figure 6 , Figure 6 for Figure 1 and Figure 5 A schematic diagram of the structure at the fixing point of the developing ring and the braided thread.

[0095] In this embodiment, the distal end of the filter 1 is closed by a developing ring 12, which includes an inner developing ring 121 and an outer developing ring 122. A guide wire 3 passes through the interior of the inner developing ring 121, and a braided wire 1-1 is fixed between the inner developing ring 121 and the outer developing ring 122. The braided wire 1-1 can be fixed to the developing ring 12 by bonding, welding, etc. The material of the developing ring 12 includes, but is not limited to, stainless steel, platinum-iridium, tantalum, or any radiopaque metal. The length of the developing ring 12 ranges from 0.9 mm to 3.0 mm.

[0096] Please refer to Figure 7 and Figure 8 , Figure 7 for Figure 1 Schematic diagram of the guidewire in the remote protection device; Figure 8 for Figure 7 A magnified view of region A in the middle.

[0097] In this embodiment, the guide wire 3 includes a main body segment 31, a nickel-titanium segment 32, and a soft spring segment 33. The proximal end of the nickel-titanium segment 32 is connected to the main body segment 31 through a stainless steel threaded connecting tube 34, and the distal end of the nickel-titanium segment 32 is connected to the soft spring segment 33. Specifically, a stable connection between the segments can be achieved through threaded crimping, bonding, welding, or other methods.

[0098] The main body segment 31 includes a constant diameter segment 311 and a variable diameter segment 312. The diameter of the variable diameter segment 312 gradually decreases from the proximal end to the distal end, with a gradient change range of 0.4 mm to 0.08 mm. The variable diameter segment 312 is used to achieve a gradient change in the diameter of the guidewire 3. The constant diameter segment 311 has a notch 313 in the middle, with a depth of 10%-20% of the diameter of the guidewire 3, allowing the main body segment 31 to break off from the notch 313 to adjust the length. At least a portion of the outer surface of the constant diameter segment 311 is coated with a PTFE (Polytetrafluoroethylene) coating to reduce frictional resistance. The thickness of the PTFE coating can be 2 μm-15 μm.

[0099] The main body segment 31 is made of materials including, but not limited to, stainless steel and nickel-titanium. The nickel-titanium segment 32 can be made of nickel-titanium alloy, which has both super elasticity and shape memory function to adapt to the tortuous path of the blood vessel; the soft spring segment 33 is composed of a spirally wound soft metal wire, used to reduce damage to the inner wall of the blood vessel by the guidewire 3. The length of the guidewire 3 ranges from 300cm to 350cm.

[0100] As can be seen, the embodiments of this application provide an adjustable length guidewire 3, which integrates a nickel-titanium segment 32 and a soft spring segment 33 through a segmented design, combined with a notch 313 and a PTFE coating, to achieve flexible adjustment of the guidewire 3 length, low-friction intervention and vascular adaptability. The stainless steel threaded connecting tube 34 ensures reliable connection between segments, and the variable diameter segment 312 optimizes the mechanical transmission efficiency of the guidewire 3, making it suitable for complex vascular interventional surgery.

[0101] Please refer to Figure 9 , Figure 9 This is a schematic diagram of a specific embodiment of the catheter provided in this application.

[0102] In this embodiment, the conduit 4 includes a delivery section 41, a solid section 42, and a recovery section 43 connected in sequence. The delivery section 41 includes a transparent section 411, wherein:

[0103] The transparent section 411 is made of transparent polymer material and has a length of 50cm-90cm. It is used to observe the position of the filter 1 in real time.

[0104] The solid section 42 is made of high-density composite material and may contain stainless steel wire. The length of the solid section 42 is 100cm-1200cm and the axial compressive strength of the solid section 42 is not less than 50N. It is used to provide structural support for the conduit 4.

[0105] The filter 1 is connected to the guide wire 3 and is pre-installed in the delivery section 41 for deployment at the lesion site. The filter 1 is made of nickel-titanium alloy to prevent thrombus and tissue fragments from falling off and to reduce damage to the inner wall of blood vessels. The outer diameter of the delivery section 41 is 3F-6F and the length is 150-300cm. The outer diameter of the retrieval section 43 is 4F-7F. The length of the retrieval section 43 matches the length of the delivery section 41, and the outer diameter of the retrieval section 43 is not less than the outer diameter of the delivery section 41.

[0106] The transport section 41 and the recovery tube section 43 are respectively equipped with imaging rings 12. The two imaging rings 12 are located at both ends of the conduit 4. The imaging rings 12 are made of high-density X-ray-proof material and are used to display the position and direction of the conduit 4 under imaging equipment. The width of the imaging rings 12 is 1mm-3mm and they are fixed to the conduit 4 by heat fusion.

[0107] Depend on Figure 9 It can be seen that the conveying section 41 is equipped with a quick-change port 412 for the guide wire. The diameter of the quick-change port 412 for the guide wire is 0.3 mm-0.8 mm. It is used for the quick introduction and withdrawal of the guide wire. The guide wire can guide the guide tube 4 to the target position.

[0108] like Figure 9As shown, the conveying section 41 is provided with a quick filter exchange port 413 at one end near the solid section 42, and the recovery pipe section 43 is provided with a guide wire hole 431 at one end near the solid section 42. The inner diameter of the quick filter exchange port 413 and the guide wire hole 431 matches the diameter of the guide wire 3 (tolerance ±0.005 mm) for conveying and recovering the filter 1.

[0109] Catheter 4 is manufactured using a segmented co-extrusion process, with smooth transition areas between segments (roughness Ra≤0.2μm) to reduce frictional resistance during vascular intervention. The total length of catheter 4 is 150cm-200cm, and it is compatible with 0.014 / 0.018 inch guidewires 3.

[0110] The materials used for each of the four segments of the catheter include, but are not limited to, medical polymer materials such as polyamide (Nylon), block polyetheramide resin (Pebax), high-density polyethylene (HDPE), polyether ether ketone (PEEK), thermoplastic polyurethane (TPU), thermoplastic elastomer (TPE), polyethylene (PE), polyvinyl chloride (PVC), and polyurethane (PU).

[0111] As can be seen, the catheter 4 in this embodiment integrates a transparent section 411 and a high-strength solid section 432 through a segmented design, combined with a contrast ring 12 and a quick exchange port structure, to optimize the visibility and operational efficiency of the catheter 4. The filter 1 pre-installed in the delivery section 41 can prevent thrombus dislodgement. It is compatible with various guidewire 3 sizes. The material and length parameters of each section are strictly matched to ensure flexibility, support and interventional safety, making it suitable for complex vascular lesion scenarios.

[0112] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A remote protection device, characterized in that, The device includes a filter screen (1) and a support bracket (2). The support bracket (2) has an opening (2a) at its proximal end. The support bracket (2) includes a column segment (21). The distal end of the column segment (21) is connected to the proximal opening of the filter screen (1). The radial dimension of the support bracket (2) is adjustable and has an expanded state and a contracted state. In the expanded state, the radial dimension of the column segment (21) is not less than the radial dimension of the proximal opening of the filter screen (1).

2. The remote protection device according to claim 1, characterized in that, The distal end of the column segment (21) includes a plurality of circumferentially distributed support portions (211), each support portion (211) including a first support rod (2111) and a second support rod (2112). In the same support portion (211), the distal ends of the first support rod (2111) and the second support rod (2112) are connected to each other. From the distal end of the support portion (211) to the proximal end of the support portion (211), the first support rod (2111) and the second support rod (2112) extend in a direction away from each other. In two adjacent support parts (211), the proximal ends of the first support rod (2111) of one support part (211) and the second support rod (2112) of the other support part (211) are connected to each other; the first support rod (2111) is provided with a first connecting hole (2-1), and the second support rod (2112) is provided with a second connecting hole (2-2). The filter screen (1) includes a woven mesh (11), which is formed by multiple braided threads (1-1) and connected to the same support part (211) and three of the braided threads (1-1), wherein: one braided thread (1-1) passes through the first connecting hole (2-1), one braided thread (1-1) passes through the second connecting hole (2-2), and one braided thread (1-1) passes between the first support rod (2111) and the second support rod (2112).

3. The remote protection device according to claim 2, characterized in that, The first support rod (2111) includes a first support rod segment (2111-1), the maximum width of the first support rod segment (2111-1) is greater than the width of other parts of the first support rod (2111), and the first connecting hole (2-1) is provided in the first support rod segment (2111-1). The second support rod (2112) includes a second support rod segment (2112-1), the maximum width of the second support rod segment (2112-1) is greater than the width of other parts of the second support rod (2112), and the second connecting hole (2-2) is provided in the second support rod segment (2112-1).

4. The remote protection device according to claim 3, characterized in that, The first support rod segment (2111-1) has an arc-shaped side wall facing the braided thread (1-1) along the width direction, and the second support rod segment (2112-1) has an arc-shaped side wall facing the braided thread (1-1) along the width direction.

5. The remote protection device according to claim 2, characterized in that, The diameter of the braided thread (1-1) ranges from 0.03mm to 0.2mm.

6. The remote protection device according to claim 2, characterized in that, The length of the filter (1) is in the range of 10mm-50mm.

7. The remote protection device according to any one of claims 1-6, characterized in that, The support bracket (2) further includes a retrieval section (22) connected to the proximal end of the column segment (21), the retrieval section (22) including a plurality of retrieval units (221) distributed circumferentially, the retrieval unit (221) including: Multiple connecting portions (2211) are distributed from the proximal end of the recovery unit body (221) towards the distal end of the recovery unit body (221). The connecting portion (2211) closest to the proximal end of the recovery unit body (2211) is the first connecting portion (2211). The k-th connecting portion (2211) includes k connecting units (2211-1) distributed circumferentially, k=1,2,3… Each connecting unit (2211-1) includes a first rod (2211-11) and a second rod (2211-12). The proximal ends of the first rod (2211-11) and the second rod (2211-12) are connected to each other by the connecting unit (2211). -1) in the direction from the proximal end to the distal end of the connecting unit (2211-1), the first rod (2211-11) and the second rod (2211-12) extend in a direction away from each other, in two adjacent connecting units (2211-1) of the same connecting part (2211), the distal ends of the first rod (2211-11) of one connecting unit (2211-1) and the distal ends of the second rod (2211-12) of the other connecting unit (2211-1) are connected to each other; in the plurality of recycling unit bodies (221), the distal ends of the plurality of connecting parts (2211) near the column segment (21) are connected to each other in the circumferential direction to form a ring structure; The proximal end of the kth connecting part (2211) has k first connecting nodes (O1), the distal end of the kth connecting part (2211) has k+1 second connecting nodes (O2), and the proximal end of the column segment (21) has multiple third connecting nodes (O3). The second connecting nodes (O2) of the connecting part (2211) near the column segment (21) and the third connecting nodes (O3) of the column segment (21) are connected accordingly. Except for the connecting part (2211) near the column segment (21), the second connecting nodes (O2) of the kth connecting part (2211) and the first connecting nodes (O1) of the k+1th connecting part (2211) are connected accordingly.

8. The remote protection device according to claim 7, characterized in that, The distal protection device also includes a guide wire (3), and the retrieval section (22) also includes multiple retrieval rods (222). The distal end of the retrieval rod (222) is connected to the first connection node (O1) of the first connection part (2211). The proximal ends of the retrieval rods (222) are connected to each other and connected to the guide wire (3). An opening (2a) is formed between two adjacent retrieval rods (222). The axis of the guide wire (3) does not coincide with the axis of the support bracket (2).

9. The remote protection device according to claim 8, characterized in that, The remote protection device also includes: The fixing part (5) is connected to the proximal end of the recovery rod (222); A limiting ring is connected to the fixing part (5), and the guide wire (3) passes through the limiting ring.

10. The remote protection device according to any one of claims 1-6, characterized in that, The filter screen (1) is made of nickel-titanium alloy; And / or, the material of the support bracket (2) is nickel-titanium alloy.

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