Thrombus extraction and embolism protection device
By designing a remotely controllable thrombectomy and embolism protection device, and utilizing the relative rotation of the metal cutting tube and the braided unit, the problems of long preparation time and poor capture effect of existing mechanical thrombectomy devices are solved, achieving safe and efficient thrombus removal and reducing surgical difficulty and risk.
Patent Information
- Application Number
- CN202422378317.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-27
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-09-27
AI Technical Summary
In existing technologies, mechanical thrombectomy devices need to reach the lesion site separately to perform aspiration or mechanical operation, which takes a long time to prepare and is difficult to effectively capture tiny escaped emboli. The aspiration catheter is prone to collapse at the lesion site, affecting the treatment effect and safety.
Design a thrombectomy and embolization protection device. By rotating the metal cutting tube and the braided unit relative to each other, the device uses a torque controller to control the metal core wire to drive the braided unit to unfold and cover the thrombus, enabling remote control and avoiding direct contact with the lesion area.
Simplifying surgical procedures reduces surgical difficulty and risk, ensures safe removal of thrombi, prevents detachment or displacement, and improves treatment efficiency and safety.
Smart Images
Figure CN223504289U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of medical devices, in particular to a thrombectomy and embolism protection device. BACKGROUND
[0002] Acute ischemic stroke has a high incidence in cerebrovascular disease. At present, there are different ways in the interventional treatment of acute ischemic stroke, such as single stent thrombectomy, double stent thrombectomy, aspiration thrombectomy, and stent combined with aspiration thrombectomy. In the current treatment concept, the mechanical and aspiration thrombectomy technology gradually gains market recognition due to its high thrombectomy efficiency and one-time recanalization rate. However, in clinical use, the aspiration catheter and the thrombectomy stent need to reach the lesion site respectively, and then aspiration or mechanical thrombectomy operation is performed to achieve vascular recanalization. The separate positioning of the aspiration catheter and the stent means that different access channels need to be built to deliver the corresponding devices, which prolongs the preparation time before thrombectomy and affects the treatment effect and postoperative recovery. At the same time, the current mechanical thrombectomy stent is mostly a cutting stent, which achieves the effect of embedding and removing the thrombus, but does not have an ideal capture effect on some small escaped thrombi. Moreover, the embedding and thrombectomy of the stent mostly rely on the structure design of the stent, and it is difficult to achieve more ideal thrombectomy operation through interaction with the operator. In addition, the Tigertrever braided thrombectomy stent does not have self-expanding ability, and the thrombectomy can only rely on the intervention of the operator to fix the thrombus, which loses the super-elastic advantage of the nickel-titanium material itself. In addition, the current aspiration catheter on the market is difficult to pass through the lesion due to different performance requirements, and more often extracts thrombus near the lesion. Moreover, during the aspiration process, increasing the negative pressure may cause the lumen to collapse and fail. Therefore, an aspiration catheter that can pass through the lesion and has the ability to effectively thrombectomy and capture escaped thrombi is also very important, and the mechanical performance of the aspiration catheter is premised on the structure implementation of the braided layer.
[0003] Therefore, there is a need in the market for a thrombectomy device that can achieve preloaded stent combined with aspiration technology. The aspiration catheter can pass through the lesion, and under the premise that the lumen is not prone to collapse during the aspiration process, it also has the ability to effectively thrombectomy and capture escaped thrombi. CONTENT OF THE UTILITY MODEL
[0004] Therefore, the present application provides a thrombectomy and embolism protection device, which facilitates the relative rotation of the metal core wire and the metal cutting tube.
[0005] According to an aspect of the present application, a thrombectomy and embolism protection device is provided, comprising: a handle, an aspiration catheter, a metal cutting tube, a metal core wire, and a braided unit;
[0006] The proximal end of the handle is provided with a twist control;
[0007] The aspiration catheter is installed in the handle and freely extends at the distal end;
[0008] The metal cutting tube is installed in the suction catheter, and a distal end is adapted to be fixed with a proximal end of the braided unit, and a proximal end is connected with the torque controller;
[0009] One end of the metal core wire is fixed with the distal end of the braided unit through the metal cutting tube, and the other end is connected with the torque controller, and the torque controller fixes the metal core wire and twists the metal cutting tube to rotate the proximal end of the braided unit.
[0010] In a possible implementation, the metal cutting tube is arranged inside the suction catheter and rotates relative to the circumference of the suction catheter.
[0011] In a possible implementation, the outer wall of the metal cutting tube is attached to the inner wall of the suction catheter.
[0012] In a possible implementation, the suction catheter is a single-lumen tube and includes a plurality of sections with variable diameters.
[0013] In a possible implementation, the suction catheter includes an inner braided layer and an outer polymer layer.
[0014] The braided layer is in a braided structure, and the material of the braided layer is nickel-titanium or stainless steel.
[0015] The outer wall of the outer polymer layer is provided with a coating, and the outer polymer layer is made of thermoplastic polyurethane, polyether block polyamide, polyethylene, or silicone, or the like, alone or spliced.
[0016] In a possible implementation, the torque controller and the suction catheter are symmetrically arranged on two sides of the handle, respectively.
[0017] In a possible implementation, the surface of the metal cutting tube is coated with a hydrophilic coating.
[0018] In a possible implementation, the braided unit is a hollow structure braided by a plurality of braided wires, and the diameter of a distal end gradually decreases to be conical, and the proximal end is fixed with at least two or more strands.
[0019] In a possible implementation, the braided unit includes a catch segment.
[0020] The catch segment is a hollow structure with open ends, the diameter of a distal end gradually decreases to be conical, and the proximal end is provided with an anchoring segment in strands, the anchoring segment is two or more, and the anchoring segment extends a dowel segment.
[0021] The dowel segment is fixed with the distal end of the metal cutting tube.
[0022] In a possible implementation, a plurality of key grooves are formed on the outer part of the metal cutting tube in the axial direction.
[0023] The beneficial effects of the thrombus extraction and embolism protection device of the embodiment of the present application are as follows: through simple rotation of the torque controller, the doctor can easily realize complex internal mechanical operation without directly contacting the lesion area, and the operation can be remotely controlled, thereby greatly reducing the operation difficulty and risk. Specifically, the metal cutting tube is arranged in the suction catheter, the distal end of the metal cutting tube is fixed to the proximal end of the braided unit, the proximal end of the metal cutting tube is connected to the torque controller, the metal core wire is arranged in the metal cutting tube, one end of the metal core wire is fixed to the distal end of the braided unit, and the other end of the metal core wire is also connected to the torque controller and kept in a relative fixed state. When the torque controller is activated, it fixes the metal core wire and drives the metal cutting tube to rotate. Since the distal end of the braided unit is fixed by the metal core wire, the proximal end of the braided unit rotates in the circumferential direction with the rotation of the metal cutting tube, and the distal end of the braided unit remains stationary, so that the braided unit can be unfolded like a net and cover the thrombus, and the thrombus can be safely extracted to prevent the thrombus from falling off or moving during the removal process.
[0024] Other features and aspects of the present application will become apparent from the following detailed description of exemplary embodiments with reference to the drawings. BRIEF DESCRIPTION OF DRAWINGS
[0025] The accompanying drawings, which are incorporated in and form a part of the specification, illustrate examples of the present application and, together with the description, serve to explain the principles of the present application.
[0026] Figure 1 A schematic diagram of a main body structure of a thrombus extraction and embolism protection device according to an embodiment of the present application is shown;
[0027] Figure 2 A schematic diagram of a partial main body structure of a thrombus extraction and embolism protection device according to an embodiment of the present application is shown;
[0028] Figure 3 Another schematic diagram of a partial main body structure of a thrombus extraction and embolism protection device according to an embodiment of the present application is shown;
[0029] Figure 4 Another schematic diagram of a main body structure of a thrombus extraction and embolism protection device according to an embodiment of the present application is shown. DETAILED DESCRIPTION
[0030] 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 signs in the drawings represent functionally identical or similar elements. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
[0031] It should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positions based on the directions or positions shown in the drawings, and are used for convenience of description and simplification of description only, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.
[0032] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or a quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.
[0033] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any implementation described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other implementations.
[0034] In addition, in order to better illustrate the present application, a large number of specific details are given in the specific embodiments below. Those skilled in the art should understand that the present application can also be implemented without some specific details. In some examples, methods, means, elements and circuits well known to those skilled in the art are not described in detail, in order to highlight the main idea of the present application.
[0035] Figure 1 A schematic diagram showing the main structure according to an embodiment of the present application is shown. As shown in the figure, the main structure comprises a main body 1, a first connecting member 2 and a second connecting member 3. Figure 1As shown, the thrombus taking and embolism protection device of the embodiment of the application comprises a handle, a suction catheter 300, a metal cutting tube 100, a metal core wire 500 and a braided unit 400. The proximal end of the handle is provided with a twist controller for controlling the relative circumferential rotation of the metal core wire 500 and the metal cutting tube 100. The suction catheter 300 is installed in the handle and freely extends at the distal end. The suction catheter 300 has excellent flexibility and directivity and can easily penetrate into a complex blood vessel network and reach the position of a thrombus. The metal cutting tube 100 is installed in the suction catheter 300 and the distal end thereof is suitable for being fixed to the proximal end of the braided unit 400. The proximal end of the metal cutting tube 100 is connected to the twist controller. One end of the metal core wire 500 is fixed to the distal end of the braided unit 400 through the metal cutting tube 100 and the other end thereof is connected to the twist controller. The twist controller fixes the metal core wire 500 and rotates the metal cutting tube 100 to rotate the proximal end of the braided unit 400. Thus, the metal core wire 500 can be fixed by controlling the twist controller 200 and the distal end of the braided unit 400 is fixed and the proximal end thereof is circumferentially rotated. After capturing the thrombus, the thrombus is covered and can be safely taken out.
[0036] In the embodiment, the doctor can easily realize complex internal mechanical operation by simply rotating the twist controller without directly contacting the lesion area and remotely controlling, which greatly reduces the operation difficulty and risk. Specifically, the metal cutting tube 100 is built in the suction catheter 300, the distal end thereof is fixed to the proximal end of the braided unit 400 and the proximal end thereof is connected to the twist controller. The metal core wire 500 is ingeniously passed through the metal cutting tube 100, one end thereof is fixed to the distal end of the braided unit 400 and the other end thereof is also connected to the twist controller and remains in a relative fixed state. When the twist controller is activated, it fixes the metal core wire 500 and drives the metal cutting tube 100 to rotate. Since the distal end of the braided unit 400 is fixed by the metal core wire 500, the proximal end thereof will circumferentially rotate with the rotation of the metal cutting tube 100 and the distal end thereof remains stationary. Thus, the braided unit 400 can be unfolded like a net and cover the thrombus, which can be safely taken out and prevented from falling off or moving during the removal process.
[0037] In a specific embodiment, the metal cutting tube 100 is arranged in the interior of the suction catheter 300 and rotates relative to the suction catheter 300. The metal cutting tube 100, the metal core wire 500 and the braided unit 400 are delivered to the position of the thrombus through the suction catheter 300. The braided unit 400 can cover the thrombus by rotating the metal cutting tube 100 using the twist controller 200.
[0038] In this embodiment, the outer wall of the metal cutting tube 100 is attached to the inner wall of the suction catheter 300, ensuring the stability and reliability of the whole during use. The fit between the outer wall of the metal cutting tube 100 and the inner wall of the suction catheter 300 effectively reduces the gap between them, avoiding the possibility of blood, thrombus fragments or other impurities accumulating in this area, thereby reducing the risk during the operation, and the metal cutting tube 100 is stably supported inside the suction catheter 300.
[0039] In a specific embodiment, the suction catheter 300 is a single-lumen tube, including a multi-section variable-diameter structure, containing an inner woven layer and an outer polymer layer. The woven layer is a special woven layer that provides support, flexibility and the ability to resist lumen collapse for the suction catheter 300, and the polymer layer is a protective layer that stabilizes the woven layer. The surface of the polymer layer contains a coating to improve the smoothness of the suction catheter 300 during delivery and prevent blood vessel damage.
[0040] In this embodiment, the material of the woven layer is nickel-titanium or stainless steel, and the outer wall of the outer polymer layer is provided with a coating. The outer polymer layer is made of thermoplastic polyurethane, polyether block polyamide, polyethylene or silicone, etc. separately or spliced.
[0041] In a specific embodiment, the twisters 200 and the suction catheter 300 are symmetrically arranged on both sides of the handle. By controlling the twister 200 on one side of the handle, the rotation of the metal core wire 500 and the metal cutting tube 100 can be relatively controlled. Since the handle is located on both sides of the handle with the metal core wire 500 and the metal cutting tube 100, it is convenient to control the twister 200 for the metal core wire 500, and the relative rotation of the metal core wire 500 and the metal cutting tube 100 is more comfortable.
[0042] In a specific embodiment, the surface of the metal cutting tube 100 is coated with a hydrophilic coating to improve the smoothness of the suction catheter 300 during delivery and prevent blood vessel damage.
[0043] In a specific embodiment, the woven unit 400 is a hollow structure woven by a plurality of woven wires, the diameter of the distal end gradually decreases to form a taper, and the proximal end is fixed by at least two or more strands.
[0044] In a specific embodiment, the woven unit 400 includes a trap segment 410, which is a hollow structure with open ends, the diameter of the distal end gradually decreases to form a taper, and the proximal segment is provided with an anchoring segment 420, the anchoring segment is two or more, and the anchoring segment extends a dowel segment 430, which is fixed with the distal end of the metal cutting tube 100. The trap segment 410 and the anchoring segment are used for collection, and the dowel segment 430 is rotated in the circumferential direction to cooperate with the trap segment 410 and the anchoring segment to cover the thrombus.
[0045] In one embodiment, the metal cutting tube 100 has a plurality of key slots 110 formed on the outer surface of the tube 100 along the axial direction. The key slots 110 can improve the flexibility of the metal cutting tube 100. The key slots 110 are not only for structural strength and positioning accuracy, but also significantly improve the flexibility of the metal cutting tube 100. The presence of the key slots 110 allows the metal cutting tube 100 to bend and deform more smoothly when subjected to external forces, thereby more easily passing through or adapting to various irregular spaces and shapes, such as the vascular network in the human body.
[0046] Embodiments of the application have been described above, along with the advantages thereof. The description is intended to be illustrative, but not restrictive, of the various embodiments of the application. Many modifications and variations of the described embodiments will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The scope of the application is defined by the appended claims. The use of the terms "preferably," "preferably," "more preferably," "most preferably" and variations thereof herein is not to be construed as limiting the scope of the claimed application, but is instead used to describe a particularly desirable embodiment. The use of the terms "may" and "may" herein is not to be construed as limiting the scope of the claimed application, but is instead used to describe a particular embodiment. The use of the terms "may" and "may" herein is not to be construed as limiting the scope of the claimed application, but is instead used to describe a particular embodiment.
Claims
1. A device for thrombus removal and embolism protection, characterized in that, include: Handle, suction tubing, metal cutting tube, metal core wire, and braided unit; A torque controller is provided at the proximal end of the handle; The suction cannula is installed inside the handle, with its distal end extending freely. The metal cutting tube is installed inside the suction tube, with its distal end adapted to be fixed to the proximal end of the braided unit, and its proximal end connected to the torsion controller; One end of the metal core wire passes through the metal cutting tube and is fixed to the far end of the braiding unit, while the other end is connected to the torsion controller. The torsion controller fixes the metal core wire and rotates the proximal end of the braiding unit by twisting the metal cutting tube.
2. The thrombectomy and embolism protection device according to claim 1, characterized in that, The metal cutting tube is disposed inside the suction conduit and rotates circumferentially relative to the suction conduit.
3. The thrombectomy and embolism protection device according to claim 2, characterized in that, The outer wall of the metal cutting tube is attached to the inner wall of the suction catheter.
4. The thrombectomy and embolism protection device according to any one of claims 1-3, characterized in that, The aspiration catheter is a single-lumen tube with multiple variable diameter sections.
5. The thrombectomy and embolism protection device according to claim 4, characterized in that, The suction catheter package includes an inner braided layer and an outer polymer layer; The braided layer has a braided structure, and the material of the braided layer is nickel-titanium or stainless steel; The outer wall of the outer polymer layer is coated, and the outer polymer layer is made of thermoplastic polyurethane, polyether block polyamide, polyethylene or silicone, or other materials individually or in combination.
6. The thrombectomy and embolism protection device according to claim 1, characterized in that, Also includes: Torque; The torsion device and the suction tube are symmetrically arranged on both sides of the handle.
7. The thrombectomy and embolism protection device according to claim 1, characterized in that, The surface of the metal cutting tube is coated with a hydrophilic coating.
8. The thrombectomy and embolism protection device according to claim 1, characterized in that, The braided unit is a hollow structure woven from multiple braided filaments, with the diameter of the distal end gradually decreasing to a cone shape, and the proximal end being fixed in strands of at least two or more.
9. The thrombectomy and embolism protection device according to claim 8, characterized in that, The weaving unit includes: a bolt-catching section; The bolt-catching section is a hollow structure with openings at both ends. The diameter of the distal end gradually decreases to a cone shape, and the proximal section is provided with anchoring sections in strands. There are two or more anchoring sections, and each anchoring section extends to a bolt-embedding section. The bolt section is fixed to the distal end of the metal cutting tube.
10. The thrombectomy and embolism protection device according to claim 1, characterized in that, The metal cutting tube has multiple keyways axially formed on its exterior.