Knitted structure for thrombectomy device

Abstract

The utility model relates to a woven structure for a thrombectomy device, which comprises a thrombectomy section, the thrombectomy section is of a hollow structure with two open ends, the diameter of the far end is gradually reduced to form a cone, the near section is provided with more than two anchoring sections in a stranded manner, the anchoring sections extend to form embedded thrombectomy sections, and the embedded thrombectomy sections are fixed with the end of a cutting pipe of the thrombectomy device. The thrombus capturing section is fixed with a core wire of the thrombus extraction device, one end with a larger section of the woven structure is open, the other end of the woven structure is closed, the end with the larger section adopts a rewinding form, woven wires are woven to serve as the thrombus embedding section, and after the thrombus capturing section and the anchoring section capture thrombus, the thrombus is wrapped by rotating the thrombus embedding section, so that the thrombus can be prevented from escaping, and the thrombus extraction efficiency is improved. A metal core wire of the thrombus extraction device is fixed to the interior of a thrombus catching section at the far end of a woven structure, a cutting pipe is fixedly connected with a thrombus embedding section at the near end of the woven structure, a twister on the thrombus extraction device is used for fixing the metal core wire, the cutting pipe is rotated to obtain the thrombus embedding section of an 8-shaped structure, the thrombus embedding and extraction capacity is improved, and thrombus is extracted.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a braided structure for a thrombus removal device. Background Art

[0002] Acute ischemic stroke remains a high-morbidity complication among cerebrovascular diseases. Current interventional treatments for acute ischemic stroke include single-stent thrombectomy, dual-stent thrombectomy, aspiration thrombectomy, and combined stent and aspiration thrombectomy. Among current treatment approaches, mechanical aspiration thrombectomy is gaining market acceptance due to its high thrombectomy efficiency and first-pass recanalization rates. However, in clinical use, the aspiration catheter and stent retriever must be delivered separately to the lesion, followed by aspiration or mechanical thrombectomy to achieve recanalization. Separate placement of the aspiration catheter and stent requires the construction of separate pathways for delivering the respective instruments, increasing pre-thrombectomy preparation time and impacting treatment efficacy and post-operative recovery. Furthermore, current mechanical thrombectomy stents are primarily cutting stents, designed to embed and remove emboli, but lack optimal capture of even small, escaping emboli. Furthermore, stent embedment and thrombectomy rely heavily on the stent's structural design, making it difficult to achieve optimal thrombectomy through operator interaction. In addition, braided thrombectomy stents such as Tigertrever do not have the ability to self-expand. Thrombectomy can only rely on the operator's intervention in the stent to fix the thrombus, which loses the superelastic advantage of the nickel-titanium material itself. In addition, the suction catheters currently on the market are difficult to pass through the lesion due to their different performance requirements, and thrombi are mostly extracted proximal to the lesion. Moreover, during the suction process, if the negative pressure is increased, the lumen collapse will occur. Therefore, it is also very critical to have a suction tube that is compatible with passing through the lesion and resisting lumen failure. The mechanical performance of the suction catheter is premised on the structural implementation of its braided layer.

[0003] Therefore, there is a need for a thrombectomy device that combines a preloaded stent with aspiration technology. This device allows the aspiration catheter to pass through the lesion, preventing the lumen from collapsing during aspiration, while also effectively removing and capturing escaping emboli. However, existing braided structures, after capturing a thrombus, make it difficult to remove a relatively intact thrombus. Utility Model Content

[0004] In view of this, the present application proposes a braided structure for a thrombus removal device, which is convenient for capturing and then covering the thrombus.

[0005] According to one aspect of the present application, there is provided a braided structure for a thrombus removal device, comprising: a thrombus catching segment;

[0006] The bolt-catching section is a hollow structure with two ends open, the diameter of the distal end gradually decreases to form a cone, and the proximal section is provided with anchoring sections in strands, there are more than two anchoring sections, and the anchoring sections are extended with bolt-embedding sections;

[0007] The plug embedding section is suitable for being fixed to the end of the cutting tube of the thrombus removal device;

[0008] The thrombus catching section is suitable for being fixed to the core wire of the thrombus removal device.

[0009] In a possible implementation, the two or more anchoring segments are symmetrically arranged along the circumferential direction of the bolt-catching segment.

[0010] In a possible implementation, the locking section extends to a first preset length; and

[0011] When the metal cutting tube drives the locking segments to rotate circumferentially, more than two locking segments are arranged crosswise, and the interval angle between any two locking segments is 120 degrees to 180 degrees.

[0012] In a possible implementation, the diameter of the proximal end of the thrombus catching section after expansion is larger than the diameter of the cutting tube of the thrombus removal device.

[0013] In a possible implementation, the outer diameter of the braided structure is 1.5 mm to 10 mm.

[0014] In a possible implementation, the total length of the braided structure is 15 mm to 50 mm.

[0015] In a possible implementation, the end of the anchoring section away from the bolt-catching section is a fully enclosed wire-collecting structure.

[0016] In a possible implementation, the number of braided structure wires of the anchoring segment is in the range of 12-96.

[0017] In a possible implementation, the braided structure is a metal braided wire material with development capability.

[0018] In a possible implementation, the mesh size of the bolt-catching segment of the braided structure is 0-400 μm.

[0019] Advantages of the Braided Structure for the Thrombectomy Device of the Embodiments of the Present Application: The braided structure is tapered, with an open end at the larger cross-section and a closed end at the other. The larger end is wound back, and the braided wire is woven into a thrombus-engaging segment. After the thrombus-capturing segment and the anchoring segment capture the thrombus, the thrombus is wrapped around the thrombus by rotating the thrombus-engaging segment, thereby preventing the thrombus from escaping. Specifically, the metal core wire of the thrombus-engaging device can be fixed to the interior of the thrombus-capturing segment at the distal end of the braided structure, and a cutting tube can be fixedly connected to the thrombus-engaging segment at the proximal end of the braided structure. The metal core wire is fixed by a twister on the thrombus-engaging device, and the cutting tube is rotated. By twisting, pushing, and pulling, the thrombus-engaging segment is formed into an "8-shaped" structure, thereby improving the ability to remove thrombi.

[0020] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features, and aspects of the application and, together with the description, serve to explain the principles of the application.

[0022] Figure 1 A schematic diagram showing a braided structure for a thrombus removal device according to an embodiment of the present application is shown;

[0023] Figure 2 A schematic diagram of a thrombus removal device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0024] Various exemplary embodiments, features, and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

[0025] Among them, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention or simplifying the description, and do not indicate or imply 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 to the present invention.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0027] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0028] In addition, numerous specific details are provided in the detailed description below to better illustrate the present application. Those skilled in the art will appreciate that the present application can be practiced without certain specific details. In some instances, methods, means, components, and circuits well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.

[0029] like Figure 1 and Figure 2 As shown, the braided structure used in the thrombus removal device of the embodiment of the present application includes: a bolt-catching segment 410, which is a hollow structure with openings at both ends, and the distal end diameter gradually decreases to form a cone, and the proximal section is provided with anchoring segments 420 in strands, there are more than two anchoring segments 420, and the anchoring segments 420 extend with bolt-embedding segments 430, which are suitable for fixing to the end of the cutting tube 310 of the thrombus removal device, and the bolt-catching segment 410 is suitable for fixing to the core wire of the thrombus removal device.

[0030] In this embodiment, the braided structure is tapered, with one end having a larger cross-section being open and the other end being closed. The larger end is wound back to form a braided wire that forms a plug-engaging segment 430. After the plug-catching segment 410 and the anchoring segment 420 capture the thrombus, the plug-engaging segment 430 is rotated to envelop the thrombus, thereby preventing it from escaping. Specifically, the metal core wire 320 of the thrombus removal device can be fixed within the plug-catching segment 410 at the distal end of the braided structure, and the cutting tube 310 is fixedly connected to the plug-engaging segment 430 at the proximal end of the braided structure. The metal core wire 320 is fixed using a twister 100 on the thrombus removal device, and the cutting tube 310 is rotated. The "8-shaped" plug-engaging segment 430 is formed by twisting, pushing, and pulling to improve the ability to remove plugged thrombi and remove the thrombus.

[0031] The bolt-catching section 410 , the anchoring section 420 and the bolt-embedding end are integrally formed and woven.

[0032] Furthermore, the embolization segment 430, the proximal portion of the braided structure, utilizes a multi-strand design. These strands are tightly and ingeniously woven together, enhancing the overall strength of the structure while allowing the embolization segment to precisely embed within the thrombus, creating a stable grip and effectively preventing the thrombus from dislodging or breaking during withdrawal. The interwoven structure of the multiple strands also increases the contact area between the embolization segment 430 and the thrombus, ensuring complete thrombus removal and reducing the risk of residual thrombus. The anchoring segment 420, following the thrombus-capturing segment 410, is a straight and stable segment. Its primary function is to tightly adhere to the vessel wall during the withdrawal of the aspiration catheter 200 and the onset of thrombus removal. This creates a barrier to prevent the passage of small thrombi, preventing them from escaping between the braided structure and the vessel wall, and ensuring the safety and effectiveness of the thrombus removal procedure. The anchoring segment 420 provides the sturdy support needed for the braided structure to maintain a stable position within the complex intravascular environment, providing a solid foundation for subsequent thrombus capture.

[0033] The embolus-trapping segment 410, the distal portion of the braided structure, features a high-density braid design. This design not only enhances the strength and toughness of the embolus-trapping segment 410 but also provides it with exceptional capture capabilities. During the aspiration and thrombus removal process, the embolus-trapping segment 410 acts like a sophisticated net, effectively intercepting and capturing tiny emboli that might escape. If not captured promptly, these tiny emboli could enter distal blood vessels with the bloodstream, leading to serious consequences such as vascular occlusion. The high-density braid structure of the embolus-trapping segment 410 minimizes this risk, ensuring the thoroughness and safety of the thrombus removal process.

[0034] In a specific embodiment, the metal core wire 320 is fixed by the twister 100 of the thrombus removal device, and the distal thrombus-catching segment 410 of the braided structure is fixed. Then, the cutting tube 310 is rotated to drive the proximal thrombus-embedding end of the braided structure to rotate circumferentially, so that more than two thrombus-embedding segments 430 are arranged crosswise, forming an intersection to perform a hollow seal on the proximal end of the braided structure, thereby fixing the thrombus in the thrombus-catching segment 410.

[0035] Furthermore, the bolt segment 430 is formed by braiding multiple strands of braided wire, extends a first predetermined length relative to the anchoring segment 420, and is fixed to the distal outer wall of the cutting tube 310. When the cutting tube 310 rotates circumferentially relative to the metal core wire 320, the cutting tube 310 drives the braided bolt segment 430 to rotate. At this point, the bolt end rotates circumferentially relative to the anchoring segment 420. Due to the rotation of the bolt segment 430 driven by the cutting tube 310, the middle position of two or more bolt segments 430 of the first predetermined length intersects to form a crossover point.

[0036] When the cutting tube 310 drives the locking segments 430 to rotate circumferentially, more than two locking segments 430 are arranged crosswise, and the interval angle between any two locking segments 430 is 120 degrees to 180 degrees.

[0037] Furthermore, in this embodiment, two or more anchoring segments 420 are symmetrically arranged along the circumference of the thrombus-catching segment 410, so that the thrombus-engaging segments 430 extending from the anchoring segments 420 are spaced apart at a predetermined distance in the circumferential direction. After the braided structure captures the thrombus, the thrombus-engaging segments 430 extending from the anchoring segments 420 are circumferentially rotated to form an intersection for fixation. When at least two anchoring segments 420 are symmetrically arranged along the circumferential direction or spaced apart at a predetermined angle, the angle of separation increases the secure fixation of the thrombus within the thrombus-catching segment 410 by the thrombus-engaging segments 430 when the extended thrombus-engaging segments 430 enclose the thrombus-catching segment 410 and secure it.

[0038] In a specific embodiment, the anchoring segment 420 makes the proximal end of the braided structure straight during the braiding process, that is, the proximal end of the braided structure can be in contact with the inner side of the blood vessel wall to prevent emboli from escaping between the braided structure and the blood vessel wall.

[0039] In one embodiment, the proximal diameter of the expanded bolt-catching segment 410 is larger than the diameter of the cutting tube 310. One end of the bolt-engaging segment 430 is fixed to the outer or inner wall of the cutting tube 310, and the other end is an extension of the anchoring segment 420. Therefore, the ends of the two or more bolt-engaging segments 430 are concentrated at the distal end of the cutting tube 310. Since the circumference of the anchoring segment 420 is much larger than the diameter of the cutting tube 310, the linear bolt-engaging segments 430 are tilted at an angle relative to the axial direction of the cutting tube 310.

[0040] In one embodiment, the interval angle is within the range of 120-180 degrees, so that the plurality of bolt-engaging segments 430 are positioned in a conical or triangular structure before circumferential rotation. Thus, the conical or triangular bolt-engaging segments 430 can encase the bolt-catching segment 410 and the anchoring segment 420 of the braided structure.

[0041] In a specific embodiment, the outer diameter of the braided structure is 1.5 mm to 10 mm.

[0042] In a specific embodiment, the total length of the braided structure is 15 mm to 50 mm.

[0043] In a specific embodiment, the end of the anchoring segment 420 away from the thrombus-catching segment 410 is a fully enclosed wire-reinforced structure. This weaving technique is used so that the weaving end will not scratch the inner wall of the blood vessel.

[0044] In a specific embodiment, the number of braided structure wire heads of the anchoring segment 420 is in the range of 12-96. Specifically, the number of braided structure wire heads s=2t (6≤t≤48), which is a positive integer and can be divided by 2 or 3).

[0045] In one embodiment, the maximum outer diameter of the braided structure is 1.5 mm to 10 mm, the total length of the braided structure is 15 mm to 50 mm, and the metal braided wire material with shape memory capability is preferably used.

[0046] Optionally, the braided wire may be made of metal wire such as nickel titanium or cobalt chromium.

[0047] Alternatively, the braided wire may be made of metal wire such as nickel titanium or cobalt chromium with a platinum core.

[0048] In a specific embodiment, the braided wire diameter is 0.001" to 0.01".

[0049] In one embodiment, the number q of the strands of the braided structure plug segment 430 is 2 or 3.

[0050] In a specific embodiment, the braided structure is preferably designed as a 1-on-1 or 2-on-2 braided structure.

[0051] In one embodiment, the mesh size of the bolt-catching segment 410 of the braided structure is 0-400 μm.

[0052] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A braided structure for a thrombus removal device, characterized in that: include: Bolt-catching section; The bolt-catching section is a hollow structure with two ends open, the diameter of the distal end gradually decreases to form a cone, and the proximal section is provided with anchoring sections in strands, there are more than two anchoring sections, and the anchoring sections are extended with bolt-embedding sections; The plug embedding section is suitable for being fixed to the end of the cutting tube of the thrombus removal device; The thrombus catching section is suitable for being fixed to the core wire of the thrombus removal device.

2. The braided structure for the thrombus removal device according to claim 1, characterized in that: The two or more anchoring segments are symmetrically arranged along the circumferential direction of the bolt-catching segment.

3. The braided structure for the thrombus removal device according to claim 2, characterized in that: The engaging bolt section extends to a first predetermined length; and When the cutting tube drives the locking segments to rotate circumferentially, more than two locking segments are arranged crosswise, and the interval angle between any two locking segments is 120 degrees to 180 degrees.

4. The braided structure for a thrombus removal device according to any one of claims 1 to 3, characterized in that: After expansion, the proximal end diameter of the thrombus catching section is larger than the diameter of the cutting tube of the thrombus removal device.

5. The braided structure for the thrombus removal device according to claim 4, characterized in that: The outer diameter of the braided structure is 1.5 mm to 10 mm.

6. The braided structure for the thrombus removal device according to claim 4, characterized in that: The total length of the braided structure is 15 mm to 50 mm.

7. The braided structure for a thrombus removal device according to claim 1, wherein: One end of the anchoring section away from the bolt-catching section is a fully enclosed wire-collecting structure.

8. The braided structure for the thrombus removal device according to claim 7, characterized in that: The number of braided structure wire heads of the anchoring segment is in the range of 12-96.

9. The braided structure for a thrombus removal device according to claim 1, wherein: The braided structure is a metal braided wire material with developing ability.

10. The braided structure for a thrombus removal device according to claim 1, wherein: The mesh size of the bolt-catching section of the braided structure is 0-400 μm.

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