Branch aneurysm plugging device
By designing a bifurcation aneurysm closure device, using the combined structure of the sealing stent, intratumoral limit and extratumoral limit, the bifurcation aneurysm closure device is solved in the prior art. Problem, achieving a more stable blocking effect and a lower recurrence rate.
Patent Information
- Application Number
- CN202323094700.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-16
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2033-11-16
AI Technical Summary
The prior art is difficult to effectively block and stably locate bifurcated aneurysms, which are prone to displacement or falloff, and complex stent assisted technology has the problems of high surgical difficulty and high recurrence rate.
A bifurcation aneurysm closure device is designed, including a closure stent, an intratumoral limit and an extratumoral limit. The stent is used to seal the neck of the tumor. The intratumoral limit and the extratumoral limit prevent the stent from displacement and falling off through the limiting action.
Effectively avoid or reduce the displacement, shedding and other phenomena during use of the stent, improve the stability and safety of the treatment and reduce the recurrence rate.
Smart Images
Figure CN222466991U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical devices, and in particular relates to a bifurcation aneurysm blocking device. Background Art
[0002] Endovascular interventional treatment of intracranial bifurcation aneurysms is still very difficult, accounting for about 2.9%-7.1% of all intracranial aneurysms. The biggest problem in endovascular treatment of bifurcation aneurysms and other aneurysms is the stable packing of coils, the impact of stent-assisted coils and blood flow guidance devices on branch vessels and aneurysm recurrence.
[0003] For bifurcated aneurysms, it is difficult to complete embolization with a single stent. Usually, multi-stent technology is used to treat bifurcated aneurysms. Complex stent-assisted technologies include "Y" stent technology, "X" stent technology, "T" stent technology, etc. However, these complex technologies still have the disadvantages of high surgical difficulty, many complications, and high recurrence rate.
[0004] As an intra-tumoral flow disturbance device, Contour can adapt to the contour of the aneurysm and take the shape of a wine glass during the release process. However, it cannot be stably retained in the aneurysm and there is a risk of displacement and detachment. In addition, the blood vessel wall inside the aneurysm is relatively thin, and the intervention of the implant inside the aneurysm will bring new risks of complications.
[0005] Therefore, there is an urgent need for a bifurcation aneurysm occlusion device that can block the aneurysm neck only outside the aneurysm and will not be displaced.
[0006] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content
[0007] The utility model aims to provide a bifurcation aneurysm occluding device to solve or improve the problem that the bifurcation aneurysm occluding device in the prior art is prone to displacement and has a high risk of falling off during use.
[0008] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a bifurcation aneurysm occlusion device, comprising: an occlusion stent, the occlusion stent is used to occlude the aneurysm neck; an intra-tumor limiting piece, the intra-tumor limiting piece is in the shape of a hollow tube, one end of the intra-tumor limiting piece is connected to the occlusion stent, the intra-tumor limiting piece is used to limit the occlusion stent in the tumor; an extra-tumor limiting piece, the extra-tumor limiting piece is arranged in the circumference of the occlusion stent; in the expanded state, the extra-tumor limiting piece abuts against the bifurcation blood vessel wall, and is used to limit the occlusion stent outside the tumor.
[0009] Preferably, there are a plurality of the extra-tumor limiting members, and the plurality of the extra-tumor limiting members are arranged at intervals along the circumference of one end of the occluding stent away from the intra-tumor limiting member.
[0010] Preferably, the extra-tumor limiting member is in the shape of an arc surface; and the size of the extra-tumor limiting member gradually increases in the direction away from the occluding stent.
[0011] Preferably, the occluding stent, the intra-tumor limiting member and the extra-tumor limiting member are woven from braided wires; the density of the braided wires constituting the extra-tumor limiting member is smaller than that of the occluding stent and / or the intra-tumor limiting member.
[0012] Preferably, in a direction away from the occluding stent, the radial dimension of the intra-tumor limiting component first gradually expands and then gradually contracts.
[0013] Preferably, in the expanded state, the maximum radial dimension of the intra-tumor limiting member is 2 mm-5 mm larger than the diameter of the neck of the bifurcated aneurysm.
[0014] Preferably, the blocking stent and / or the intratumor limiting member are formed by hot-pressing two layers of woven mesh.
[0015] Preferably, the braided wires of the occluding stent and / or the intratumor limiting member are gathered in a tying sleeve, and the material of the tying sleeve is a developing material.
[0016] Preferably, the material of the braided wires constituting the occluding stent and / or the intratumor limiting component includes shape memory alloy and imaging alloy.
[0017] Beneficial effects:
[0018] The bifurcation aneurysm occluding device of the utility model comprises an intra-tumor limiting member and an extra-tumor limiting member. The provision of the intra-tumor limiting member and the extra-tumor limiting member can effectively avoid or reduce the displacement, falling off and the like of the occluding stent during use. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:
[0020] Figure 1 This is a schematic structural diagram of a bifurcation aneurysm occlusion device according to an embodiment of the utility model;
[0021] Figure 2 A schematic structural diagram of a bifurcation aneurysm occlusion device from another perspective of an embodiment of the utility model;
[0022] Figure 3This is a schematic cross-sectional view of a bifurcation aneurysm occlusion device according to an embodiment of the utility model;
[0023] Figure 4 This is a schematic diagram of the effect of a bifurcation aneurysm occlusion device according to an embodiment of the utility model after being implanted into a bifurcation aneurysm blood vessel.
[0024] Reference numerals:
[0025] 1-occluder stent; 2-intratumor limiter; 3-cuff; 4-extratumor limiter; 5-bifurcation aneurysm. DETAILED DESCRIPTION
[0026] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.
[0027] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and 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 on the present invention.
[0028] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.
[0029] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more features.
[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be internal connection between two elements, indirect connection, or an interactive relationship between two elements.
[0031] The present invention will be described in detail below in conjunction with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.
[0032] In view of the problem that bifurcation aneurysm occlusion devices in the prior art are prone to displacement or high risk of falling off during use, the utility model proposes a bifurcation aneurysm occlusion device to solve or improve at least one of the above problems.
[0033] like Figure 1-4 As shown, the bifurcation aneurysm occluding device of the utility model comprises: an occluding stent 1, which is used to occlude the aneurysm neck (the aneurysm neck of the bifurcation aneurysm); an intra-tumor limiting member 2, which is a hollow tube, one end of which is connected to the occluding stent 1, and is used to limit the occluding stent 1 in the aneurysm; an extra-tumor limiting member 4, which is arranged in the circumference of the occluding stent 1; in the expanded state, the extra-tumor limiting member 4 abuts against the bifurcation blood vessel wall, and is used to limit the occluding stent 1 outside the aneurysm.
[0034] The utility model sets an extratumor stopper 4 in the circumferential direction of the blocking stent 1, so that the extratumor stopper 4 can abut against the bifurcation blood vessel wall; thus, during the use of the bifurcation aneurysm blocking device of the utility model, the extratumor stopper 4 can play a certain role in preventing the bifurcation aneurysm blocking device of the utility model from moving (longitudinal movement). The intratumor stopper 2 can be set in the bifurcation aneurysm 5 to provide sufficient support for the bifurcation aneurysm blocking device of the utility model, reducing the risk of displacement (lateral displacement) of the bifurcation aneurysm blocking device of the utility model.
[0035] Preferably, in the expanded state, the occluding stent 1 is umbrella-shaped, convex toward the intratumor stopper 2 (i.e., the convex surface of the umbrella-shaped occluding stent 1 faces the intratumor stopper 2), and is completely attached to the bifurcated aneurysm. The dense mesh at the center of the occluding stent 1 helps to increase the blood flow guidance effect in the aneurysm neck area.
[0036] In the preferred embodiment of the bifurcation aneurysm occluding device of the utility model, a plurality of the aneurysm outer stoppers 4 are provided, and the plurality of the aneurysm outer stoppers 4 are arranged at intervals along the circumference of the end of the occluding stent 1 away from the aneurysm inner stopper 2. Among them, by providing a plurality of the aneurysm outer stoppers 4, it is helpful to improve the supporting performance of the aneurysm outer stoppers 4 on the occluding stent 1, thereby better realizing the limiting of the occluding stent 1, reducing or preventing the displacement and falling off of the bifurcation aneurysm occluding device of the utility model during use.
[0037] In the preferred embodiment of the bifurcation aneurysm occluding device of the utility model, the aneurysm outer stopper 4 is in an arcuate surface shape (that is, the aneurysm outer stopper 4 is not in a plane shape as a whole, but has a certain curvature); in the direction away from the occluding stent 1, the size of the aneurysm outer stopper 4 gradually increases (preferably, the overall contour of the aneurysm outer stopper 4 is in a shape similar to a trapezoid or a triangle). Among them, by gradually increasing the size of the aneurysm outer stopper 4 in the direction away from the occluding stent 1, it is helpful to increase the contact area between the aneurysm outer stopper 4 and the bifurcation blood vessel wall, thereby helping to increase the limiting effect of the aneurysm outer stopper 4 on the occluding stent 1.
[0038] In a preferred embodiment of the bifurcation aneurysm occlusion device of the utility model, the occlusion stent 1, the intra-tumor stopper 2 and the extra-tumor stopper 4 are woven from braided wires; the density of the braided wires constituting the extra-tumor stopper 4 is less than that of the occlusion stent 1 and / or the intra-tumor stopper 2 (i.e., the braided wires of the extra-tumor stopper 4 are sparser than those of the occlusion stent 1 and / or the intra-tumor stopper 2). By making the braided wire density of the extra-tumor stopper 4 smaller (sparser), it is helpful to reduce the pressure of the extra-tumor stopper 4 on the bifurcation blood vessel wall, thereby reducing or avoiding damage to the bifurcation blood vessel wall.
[0039] Preferably, the bifurcation aneurysm occluding device of the present invention is an integrated braided structure.
[0040] In a preferred embodiment of the bifurcation aneurysm occluding device of the utility model, the radial dimension of the intratumor stopper 2 gradually expands and then gradually contracts in the direction away from the occluding stent 1. The above arrangement helps to improve the limiting effect of the intratumor stopper 2 in the aneurysm, thereby reducing the displacement or falling off of the bifurcation aneurysm occluding device of the utility model during use.
[0041] In a preferred embodiment of the bifurcation aneurysm occluding device of the utility model, in the expanded state, the maximum radial dimension of the intratumor stopper 2 is 2mm-5mm (for example, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm) larger than the diameter of the aneurysm neck opening of the bifurcation aneurysm. By making the maximum radial dimension of the intratumor stopper 2 in the expanded state 2-5mm larger than the diameter of the aneurysm neck opening of the bifurcation aneurysm (or the minimum diameter of the bifurcation aneurysm 5), it helps to ensure that the intratumor stopper 2 can be fully opened after implantation and fit with the inner wall of the aneurysm sac; thus, it helps to prevent or reduce the intratumor stopper 2 from falling out from the inside of the bifurcation aneurysm 5, and ensure the limiting effect of the intratumor stopper 2 on the bifurcation aneurysm occluding device of the utility model.
[0042] In a preferred embodiment of the bifurcation aneurysm occluding device of the utility model, the occluding stent 1 and / or the intra-tumor limiting member 2 are formed by hot-pressing two layers of braided mesh.
[0043] In a preferred embodiment of the bifurcation aneurysm occlusion device of the utility model, the braided wires of the occlusion stent 1 and / or the intra-tumor stopper 2 are gathered in the tying sleeve 3, and the material of the tying sleeve 3 is a developing material. Preferably, the tying sleeve 3 has a certain ductility and can gather the braided wires by physical compression and gripping.
[0044] In the preferred embodiment of the bifurcation aneurysm occluding device of the utility model, the material of the braided wire constituting the occluding stent 1 and / or the intratumor stopper 2 includes shape memory alloy (nickel-titanium wire, platinum core nickel-titanium wire, etc.) and developing alloy (platinum-tungsten alloy wire, platinum-iridium alloy wire, etc.). The above arrangement enables the bifurcation aneurysm occluding device of the utility model to have both shape recovery performance and developing performance by changing the ratio of shape memory alloy to developing material, including but not limited to 4:1, 3:1, 2:1, etc.
[0045] In a preferred embodiment of the bifurcation aneurysm occlusion device of the present invention, the bifurcation aneurysm occlusion device of the present invention is an integrated braided structure (refer to Figure 1-2 ), including an occluding stent 1, an intra-tumor limiting member 2, a tying sleeve 3 and an extra-tumor limiting member 4. Figure 3The cross-sectional schematic diagram of the bifurcation aneurysm occlusion device is shown in the figure: the occlusion stent 1 and the intratumor stopper 2 are shaped into a double-layer structure by heat treatment, and the braided wire at one end is gathered by the tying sleeve 3. The two layers of braided mesh are connected by hot pressing (the braided wires of the two layers of braided mesh are not interwoven; that is, the two layers of braided mesh are not connected together by braiding). The shape structure of the occlusion stent 1 is formed by the inward folding of the braided wire, and the number of braided wires can be 36, 48, 64, 72, 96 or 144. The material of the braided wire is preferably a shape memory alloy, such as NiTi wire, platinum core nickel titanium wire, etc. At the same time, in order to increase the overall development effect of the stent, a shape memory alloy and a development alloy can be selected for mixed braiding, and the development material can be selected from platinum tungsten alloy wire, platinum core nickel titanium wire, etc. By changing the ratio of shape memory alloy to development material, including but not limited to 4:1, 3:1, 2:1, etc., the bifurcation aneurysm occlusion device of the utility model has both shape recovery performance and development performance. The material and quantity of the braided wire of the intratumor stopper 2 are consistent with those of the occluding stent 1. In order to ensure that the bifurcation aneurysm occluding device of the present invention can be fully opened after implantation and fit with the inner wall of the aneurysm sac, the maximum diameter of the intratumor stopper 2 must be 2-5 mm larger than the width of the aneurysm body (radial dimension at the neck of the aneurysm). The tying sleeve 3 is made of a developing material and has a certain degree of ductility, and can be used to gather the braided wire by physical compression and gripping. Figure 4 This is a schematic diagram of the effect of the bifurcated aneurysm occlusion device of the utility model after being implanted into the bifurcated aneurysm blood vessel; after the occlusion stent 1 is fully released, it has an umbrella-shaped structure and is completely attached to the wall. The dense mesh in the center increases the blood flow guidance effect in the neck area of the aneurysm. The intratumor limiter 2 provides sufficient support for the entire device, reducing the risk of lateral displacement of the device. The outermost extratumor limiter 4 is a sparse woven mesh, which reduces the risk of longitudinal movement of the device outside the aneurysm.
[0046] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model (the structural design of the bifurcation aneurysm occlusion device of the utility model is not limited to the shape provided in the drawings of the specification, and can provide a certain support function and provide a channel for blood flow). For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.
Claims
1. A bifurcation aneurysm occlusion device, characterized in that: include: A blocking stent, wherein the blocking stent is used to block the neck of the tumor; An intratumor limiting member, wherein the intratumor limiting member is in a hollow tubular shape, one end of which is connected to the blocking stent, and the intratumor limiting member is used to limit the blocking stent in the tumor; An extra-tumor limiting member, wherein the extra-tumor limiting member is arranged in the circumference of the occluding stent; In the expanded state, the extratumor limiting member abuts against the vessel wall of the bifurcation portion, so as to limit the position of the occluding stent outside the tumor.
2. The bifurcation aneurysm occlusion device according to claim 1, characterized in that: There are multiple outer-tumor limiting members, and the multiple outer-tumor limiting members are arranged at intervals along the circumference of the occluding stent away from the inner-tumor limiting member.
3. The bifurcation aneurysm occlusion device according to claim 1, characterized in that: The outer stopper of the tumor is in the shape of an arc surface; In the direction away from the occluding stent, the size of the extra-tumor limiting component gradually increases.
4. The bifurcation aneurysm occlusion device according to any one of claims 1 to 3, characterized in that: The blocking stent, the intra-tumor limiting component and the extra-tumor limiting component are woven from braided wires; The density of the braided wires constituting the extra-tumor limiting member is lower than that of the occluding stent and / or the intra-tumor limiting member.
5. The bifurcation aneurysm occlusion device according to claim 1, characterized in that: In the direction away from the occluding stent, the radial dimension of the intra-tumor limiting component first gradually expands and then gradually contracts.
6. The bifurcation aneurysm occlusion device according to claim 5, characterized in that: In the expanded state, the maximum radial dimension of the intra-tumor limiting member is 2 mm-5 mm larger than the diameter of the neck of the bifurcated aneurysm.
7. The bifurcation aneurysm occlusion device according to claim 1, characterized in that: The blocking stent and / or the intra-tumor limiting component are formed by hot-pressing two layers of woven mesh.
8. The bifurcation aneurysm occlusion device according to claim 7, characterized in that: The braided wires of the blocking stent and / or the intratumor limiting member are gathered in the tying sleeve, and the material of the tying sleeve is a developing material.
9. The bifurcation aneurysm occlusion device according to claim 1, characterized in that: The braided wires constituting the occluding stent include shape memory alloy braided wires and developing alloy braided wires; and / or, The braided wires constituting the intratumor limiting element include shape memory alloy braided wires and developing alloy braided wires.