Cutting tube

Abstract

The utility model relates to a cutting tube which comprises a cutting tube body, the cutting tube body is suitable for being installed in a suction catheter of a thrombectomy device, the cutting tube body is of a tubular structure, the near end of the cutting tube body is fixedly connected with a twister of the thrombectomy device, the far end of the cutting tube body is connected with a woven structure of the thrombectomy device, and a key groove is formed in the outer wall of the far end of the cutting tube body; the weaving structure is wound on a key groove in the far end of the cutting pipe, the twisting device is rotated to sequentially drive the cutting pipe and the weaving structure to rotate, the metal core wire penetrates through the interior of the cutting pipe to be fixedly connected with the far end of the weaving unit, the far end of the cutting pipe is wound with the weaving structure to be fixed, and the weaving structure is fixed by fixing the metal core wire and rotating the twisting device located on the handle. When the thrombus is taken out, the cutting tube can be driven, and the near end of the woven structure connected with the far end of the cutting tube in a winding mode is driven, so that the near ends of the woven structure are wound mutually for taking out the thrombus after wrapping the thrombus.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a cutting tube. 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] The market needs a thrombectomy device that can realize pre-loaded stents and aspiration technology. The aspiration catheter can pass through the lesion, and under the premise that the lumen is not easy to collapse during the aspiration process, it has the ability to effectively remove the thrombus and capture escaped emboli. However, after the thrombus is captured, how to better remove the thrombus with the cutting tube and braided structure of the device has become an urgent problem to be solved in this field. Utility Model Content

[0004] In view of this, the present application proposes a cutting tube to facilitate twisting the braided structure inside the blood vessel and removing the thrombus.

[0005] According to one aspect of the present application, there is provided a cutting tube, comprising: a cutting tube;

[0006] The cutting tube is suitable for being installed inside the suction catheter of the thrombus removal device;

[0007] The cutting tube is a tubular structure, the proximal end of which is fixedly connected to the twister of the thrombus removal device, and the distal end is connected to the braided structure of the thrombus removal device, and a key groove is provided on the distal outer wall of the cutting tube. The braided structure is wrapped around the distal key groove of the cutting tube. The twister is rotated, which in turn drives the cutting tube and the braided structure to rotate.

[0008] In a possible implementation, the keyway is opened along the circumference of the cutting tube, and the cross section is an arc-shaped structure with a notch.

[0009] In a possible implementation, a diameter of the braided strands of the braided structure wound around the cutting tube is greater than a width of the keyway.

[0010] In a possible implementation, the key grooves are provided in a plurality and are spaced apart along the axial direction of the cutting tube.

[0011] In a possible implementation, the notches of the plurality of keyways are arranged in a spiral shape along the axial direction of the cutting tube.

[0012] In a possible implementation, the spacing between adjacent key slots is x=m*l (m>0, l is the slot width);

[0013] The circumferential offset between adjacent keyways is y=n*C (0<n<1, C is the circumference of the metal cutting tube).

[0014] In a possible implementation, the braided structure includes two or more braided wire strands wound around the cutting tube.

[0015] In a possible implementation, at least two or more braided wire strands are symmetrically arranged.

[0016] In a possible implementation, the distance between any adjacent key grooves gradually decreases from the proximal end of the cutting tube to the distal end of the cutting tube.

[0017] In a possible implementation, the surface of the cutting tube contains a hydrophilic coating.

[0018] The cutting tube of the present invention has the following beneficial effects: After the cutting tube is installed within the aspiration catheter of the thrombectomy device, the proximal end of the cutting tube is connected to the twister of the handle. The distal end is provided with a keyway, allowing the strands of the braided structure to be wrapped around the keyway provided at the distal end of the cutting tube, thereby facilitating the strands of the braided structure to be secured to the outer wall of the cutting tube. In this manner, a metal core wire is passed through the interior of the cutting tube and fixedly connected to the distal end of the braided unit. The distal end of the cutting tube is then wrapped around the braided structure for securement. By securing the metal core wire and rotating the twister on the handle, the cutting tube and the proximal end of the braided structure, which is wrapped around the distal end of the cutting tube, are driven, causing the proximal ends of the braided structure to entangle with each other, thereby enveloping the thrombus for removal. The cutting tube has a small diameter, and conventional bonding methods are not suitable for securing the braided structure to the cutting tube. Furthermore, if the braided structure falls off the cutting tube during use, it will significantly affect the surgical outcome. Therefore, the present invention secures the cutting tube to the braided unit by wrapping the braided structure around the keyway provided on the cutting tube.

[0019] 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

[0020] 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.

[0021] Figure 1 An enlarged schematic diagram showing a partial structure of a cutting tube according to an embodiment of the present application;

[0022] Figure 2 A schematic structural diagram of a thrombus removal device according to an embodiment of the present application is shown;

[0023] Figure 3 An enlarged schematic diagram of a weaving unit 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 、 Figure 2 and Figure 3 As shown, the cutting tube of the embodiment of the present application includes: a cutting tube 100, which is suitable for being installed inside the suction catheter 300 of the thrombus removal device. The cutting tube 100 is a tubular structure, the proximal end of which is fixedly connected to the twister 200 of the thrombus removal device, and the distal end is connected to the braided structure 400 of the thrombus removal device, and a key groove 110 is provided on the distal outer wall of the cutting tube 100, and the braided structure 400 is wrapped around the distal key groove 110 of the cutting tube 100. Rotating the twister 200 drives the cutting tube 100 and the braided structure 400 to rotate in turn.

[0030] In this embodiment, after the cutting tube 100 is installed inside the aspiration catheter 300 of the thrombus removal device, the proximal end of the cutting tube 100 is connected to the twister 200 of the handle. The distal end is provided with a keyway 110, which allows the strands woven from the proximal end of the braided structure 400 to be wrapped around the keyway 110 provided at the distal end of the cutting tube 100, thereby facilitating the strands of the braided structure 400 to be fixed to the outer wall of the cutting tube 100. In this manner, the metal core wire 500 is passed through the interior of the cutting tube 100 and fixedly connected to the distal end of the braided unit. The distal end of the cutting tube 100 is then wrapped around and fixed to the braided structure 400. By fixing the metal core wire 500, the twister 200 on the handle is rotated, which drives the cutting tube 100 and the proximal end of the braided structure 400, which is wrapped around the distal end of the cutting tube 100, so that the proximal ends of the braided structure 400 are intertwined, thereby enveloping the thrombus for removal. The diameter of the cutting tube 100 is small, and the conventional bonding method cannot be used to fix the braided structure 400 to the cutting tube 100. If the braided structure 400 falls off the cutting tube 100 during use, it will greatly affect the surgical results. Therefore, this application adopts the method of wrapping the braided structure 400 around the key groove 110 on the cutting tube 100 to achieve the fixation of the cutting tube 100 and the braided unit.

[0031] It should be noted that the braided structure 400 is a hollow structure with two open ends. The distal end gradually tapers in diameter, and the proximal end is provided with strands of anchoring segments 430. There are two or more anchoring segments 430, each of which is extended by a bolt-catching segment 420. The bolt-catching segment 420 is fixed to the distal end of the metal cutting tube 100 and spaced relative to the exterior of the metal cutting tube 100. The bolt-catching segment 410, anchoring segment 430, and bolt-catching end are integrally braided. There are two or more anchoring ends, which are wrapped around the keyway 110 at the distal end of the cutting tube 100.

[0032] In a specific embodiment, the key slot 110 is opened along the circumference of the cutting tube 100 and has an arc-shaped cross-section with a notch. The opening of the key slot 110 allows the proximal end of the braided structure 400 to be wound and fixed.

[0033] In a specific embodiment, the diameter of the braided wire strands of the braided structure 400 wrapped around the cutting tube 100 is larger than the opening width of the key slot 110, ensuring that the anchoring end woven by the braided structure 400 can be wrapped around the inside of the key slot 110 and then fixed from the notch of the key slot 110 of the arc structure.

[0034] In one embodiment, multiple key slots 110 are provided, spaced apart axially along the cutting tube 100. By adjusting the cutting texture, the softness and flexibility of the cutting tube 100 are controlled, thereby enhancing the cutting tube 100's resistance to bending and fracture. Specifically, the provision of key slots 110 greatly enhances the cutting tube 100's application value in medical interventional procedures, ensuring optimal maneuverability, flexibility, and stability when traversing tortuous blood vessels or confined spaces.

[0035] In one embodiment, the notches of the plurality of keyways 110 are arranged in a spiral shape along the axial direction of the cutting tube 100 .

[0036] In a specific embodiment, the spacing between adjacent key slots 110 is x=m*l (m>0, l is the slot width), and the circumferential offset between adjacent key slots 110 is y=n*C (0<n<1, C is the circumference of the metal cutting tube 100).

[0037] In a specific embodiment, the braided structure 400 includes two or more braided strands wound around the cutting tube 100 , so that the braided unit can be wound around the distal end of the cutting tube 100 .

[0038] In a specific embodiment, at least two or more braided wire strands are symmetrically arranged to facilitate winding and fixing of the two or more wire strands.

[0039] In one specific embodiment, the spacing between any two adjacent keyways 110 gradually decreases from the proximal end of the cutting tube 100 to the distal end of the cutting tube 100. The spacing between adjacent keyways 110 on the cutting tube 100 follows a specific mathematical relationship, namely, x = m*l, where m is a coefficient greater than 0 and l is the width of the keyway 110. In particular, when the spacing x is mentioned to gradually decrease from the proximal end to the distal end, it means that the designer has considered the characteristics of the cutting tube 100 in complex environments, such as the flexibility required when inserting or passing through narrow spaces. The staggered amount of adjacent keyways 110 in the circumferential direction is precisely set to y = n*C, where n is a coefficient between 0 and 1 and C is the circumference of the cutting tube 100. This staggered layout not only enhances the overall structural strength of the cutting tube 100, prevents potential damage due to stress concentration, reduces resistance, and improves efficiency, but also provides the cutting tube 100 with better stability and durability when rotating or bending.

[0040] In a specific embodiment, the surface of the cutting tube 100 contains a hydrophilic coating, which has excellent lubricating properties and can significantly reduce the friction coefficient of the surface of the cutting tube 100. The application of the hydrophilic coating makes the cutting tube 100 smoother when inserted into and through the blood vessel, reduces the insertion force, and avoids possible puncture damage and severe wear between the device surface and the blood vessel wall.

[0041] 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 cutting tube, characterized in that: include: Cutting pipes; The cutting tube is suitable for being installed inside the suction catheter of the thrombus removal device; The cutting tube is a tubular structure, the proximal end of which is fixedly connected to the twister of the thrombus removal device, and the distal end is connected to the braided structure of the thrombus removal device, and a key groove is provided on the distal outer wall of the cutting tube. The braided structure is wrapped around the distal key groove of the cutting tube. The twister is rotated, which in turn drives the cutting tube and the braided structure to rotate.

2. The cutting tube according to claim 1, characterized in that The keyway is opened along the circumference of the cutting tube, and the cross section is an arc-shaped structure with a notch.

3. The cutting tube according to claim 2, characterized in that The diameter of the braided strands of the braided structure wound around the cutting tube is greater than the opening width of the keyway.

4. The cutting tube according to any one of claims 1 to 3, characterized in that: There are a plurality of keyways, which are spaced apart along the axial direction of the cutting tube.

5. The cutting tube according to claim 4, characterized in that The notches of the plurality of keyways are arranged in a spiral shape along the axial direction of the cutting tube.

6. The cutting tube according to claim 4, characterized in that The spacing between adjacent key slots is x=m*l, where m>0 and l is the slot width; The circumferential offset between adjacent keyways is y=n*C, 0<n<1, and C is the circumference of the metal cutting tube.

7. The cutting tube according to claim 1, wherein: The braided structure has two or more braided wire strands wound around the cutting tube.

8. The cutting tube according to claim 7, characterized in that At least two or more braided strands are symmetrically arranged.

9. The cutting tube according to claim 4, characterized in that The distance between any adjacent key grooves gradually decreases from the proximal end of the cutting tube to the distal end of the cutting tube.

10. The cutting tube according to claim 4, wherein: The surface of the cutting tube contains a hydrophilic coating.

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