Stent for treating intracranial aneurysms

Abstract

The utility model discloses a kind of stents for treating intracranial aneurysm, it is related to medical stent technical field.The equal level in the aspect of current stent cannot reduce axial shortening and optimize stress distribution, leading to stent stress concentration and corrosion acceleration, increase the treatment risk and recovery difficulty of patient, the following scheme is presented, it includes stent sleeve and stent guide tube, stent sleeve inside is placed with stent body, multiple support ribs of evenly distributed are fixedly arranged on the stent body, the stent body is sinusoidal, multiple The support rib is V-shaped.The utility model is set to the stent body and support rib of sinusoidal, improve the compliance and wall-adhesion of stent, effectively reduce axial shortening rate, simultaneously optimize stress distribution, and then greatly reduce stress corrosion rate, to reduce postoperative complication, improve treatment effect.

Description

Technical Field

[0001] This utility model belongs to the field of medical stent technology, and in particular relates to a stent for treating intracranial aneurysms. Background Technology

[0002] Stenting is a minimally invasive interventional procedure used to treat intracranial aneurysms. By placing different types of metal stents (such as expandable metal stents, synergistic stents, and mesh stents) at the aneurysm site, blood is prevented from entering the aneurysm, thus preventing rupture and bleeding and improving the patient's blood flow. This procedure has the advantages of being minimally invasive, having a fast recovery time, and being relatively safe. However, a comprehensive evaluation is required before the procedure, and close follow-up is also necessary after the procedure.

[0003] Currently, while existing aneurysm stents possess a certain degree of support and can achieve some aneurysm treatment goals, they cannot reach the same level in reducing axial shortening and optimizing stress distribution. This leads to stent stress concentration and accelerated corrosion, increasing the treatment risk and recovery difficulty for patients. Utility Model Content

[0004] The purpose of this invention is to provide a stent for treating intracranial aneurysms. By utilizing the sinusoidal stent body and supporting ribs, the stent's flexibility and wall adhesion are improved, effectively reducing the axial shortening rate. At the same time, the stress distribution is optimized, thereby significantly reducing the stress corrosion rate, thus reducing postoperative complications, improving treatment efficacy, and solving existing technical problems.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: A stent for treating intracranial aneurysms, comprising: The bracket sleeve and the bracket guide tube are provided. The bracket body is placed inside the bracket sleeve. Multiple support ribs are fixedly arranged evenly on the bracket body. The bracket body is sinusoidal and the multiple support ribs are V-shaped.

[0006] Optionally, the surfaces of both the support body and the supporting ribs are coated with a bio-coating.

[0007] Optionally, the bottom of the support sleeve is conical, and the outer ring of the bottom of the support sleeve is provided with external threads at the conical part.

[0008] Optionally, one end of the bracket guide tube is a flared opening, and the inner wall of the bracket guide tube at the flared opening is provided with an internal thread groove, which is adapted to the external thread and can be disengaged from the threaded connection.

[0009] Optionally, the other end of the bracket guide tube is fixedly connected to a handle, one side of the handle is fixedly connected to a connecting tube, and anti-slip stripes are fixedly provided on both the upper and lower sides of the handle.

[0010] Optionally, the top outer ring of the support sleeve is provided with a bevel.

[0011] The embodiments of this utility model have the following beneficial effects: This invention improves the flexibility and wall-adherence of the support structure by using a sinusoidal support body and supporting ribs, effectively reducing the axial shortening rate and optimizing stress distribution, thereby significantly reducing the stress corrosion rate, reducing postoperative complications, and improving treatment outcomes.

[0012] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram showing the overall disassembly and partial enlargement of an embodiment of the present utility model; Figure 3 This is a top view of the main body of the bracket according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the main frame structure according to an embodiment of the present invention.

[0015] In the diagram: 1. Support sleeve; 101. Bevel; 102. Conical shape; 103. External thread; 2. Support body; 3. Support rib; 4. Bio-coating; 5. Support guide tube; 501. Trumpet-shaped opening; 502. Internal thread groove; 6. Handle; 601. Anti-slip stripes; 7. Connecting tube. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0017] In the description of this utility model, it should be understood that the terms "opening", "upper", "middle", "length", "inner", etc., which indicate orientation or positional relationship, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0018] To keep the following description of the embodiments of this utility model clear and concise, detailed descriptions of known functions and known components are omitted. Example 1

[0019] Please see Figure 1-4 As shown, this embodiment provides a support, including: The support sleeve 1 and the support guide tube 5 are used to house the support body 2. The support body 2 is made of laser-engraved nickel-titanium alloy tubing (compliant with ASTM F2063, phase transition temperature Af=33±2℃). The outer diameter of the body is 2.5-4.0mm (unfolded state), and the outer diameter is ≤1.8mm when compressed to the conveying state. The surface is electrolytically polished (Ra=0.6μm). The support body 2 has a sinusoidal design (e.g., Figure 4 As shown in the figure, multiple V-shaped support ribs 3 are fixedly installed on it in a uniform manner. Both the support body 2 and the support ribs 3 are made of metals such as stainless steel, nickel-titanium alloy and other materials with good biocompatibility and mechanical properties or polymer materials to ensure the strength and durability of the support.

[0020] To further improve the biocompatibility of the stent and promote the growth of vascular endothelial cells, the surfaces of the stent body 2 and the support rib 3 are coated with a bio-coating 4 (such as the sustained-release drug coating in patent CN201350138Y or the poly(monochloro-p-xylene) coating in patent CN108367097A). This bio-coating 4 can be a bio-inert coating to reduce the interaction between the stent and the blood or vascular wall, or it can be a polymer coating with surface bioactive molecules fixed in situ or loaded with bioactive factors to promote the vascular endothelialization process and reduce the risk of thrombosis and restenosis.

[0021] This application can be used to treat intracranial aneurysms, or in other fields applicable to this application. Example 2

[0022] Improvements based on Example 1: See Appendix Figure 1-2A stent for treating intracranial aneurysms is described. The bottom of the stent cannula 1 is tapered 102, and an external thread 103 is provided at the tapered 102. One end of the stent guide tube 5 is a flared opening 501. The tapered 102 and the flared opening 501 increase the sealing or tightness after the stent cannula 1 and the stent guide tube 5 are connected. The inner wall of the flared opening 501 is provided with an internal thread groove 502, which is adapted to the external thread 103 and can be disengaged from the threaded connection. This design allows the stent cannula 1 and the stent guide tube 5 to be easily connected and separated, and to be disassembled and installed while facilitating the replacement of stent bodies 2 of different lengths or sizes.

[0023] At the other end of the stent guide tube 5, a handle 6 is fixedly connected. A connecting tube 7 is fixedly connected to one side of the handle 6 for inserting a guide wire or a finer catheter. Anti-slip stripes 601 are fixedly provided on both the upper and lower sides of the handle 6 to increase the doctor's grip and stability during the operation. Example 3

[0024] Improvements based on Example 1: See Appendix Figure 2 , The top outer ring of the stent cannula 1 is provided with a bevel 101. The design of the bevel 101 helps the stent cannula 1 to be inserted into the artery more smoothly along the guide wire, so that it can enter the intracranial artery more smoothly and be introduced near the aneurysm.

[0025] Fatigue test: 4×10 tests were conducted in physiological saline at 37℃. 6 Cycle 60 times / minute, pressure gradient 120-80 mmHg; 100% retention of stent structural integrity; coating peeling ≤0.1 μg / mm² (HPLC detection method).

[0026] Animal experiment: A 6-month follow-up of a beagle carotid artery model (n=6) showed: Endothelialization was completed in 28 ± 3 days (confirmed by CD31 immunohistochemistry). Stenosis rate <15% (QCA quantitative analysis).

[0027] The usage process and working principle of this utility model technical solution are as follows: When starting to use, all medical devices that come into contact with the patient should be strictly disinfected or the stent should be removed from the sterile packaging bag to ensure aseptic operation. Then, align the funnel-shaped opening 501 of the stent guide tube 5 with the cone-shaped opening 102 at the bottom of the stent sleeve 1, and then rotate the stent guide tube 5 clockwise to make it tightly connected with the stent sleeve 1. During this process, ensure that the internal thread groove 502 and the external thread 103 are correctly aligned. The guide wire is then inserted into the intracranial artery and reaches the aneurysm. The medical staff holds the handle 6 with one hand and the stent cannula 1 with the other. The stent cannula 1 is then placed over the guide wire, and the stent guide tube 5 is slowly inserted into the artery. Under the guidance of medical imaging technology, the medical staff guides the stent cannula 1 through the guide wire into the intracranial artery and into the vicinity of the patient's aneurysm. The guide wire is then withdrawn, and the stent guide wire is inserted from the connecting tube 7 into the stent guide tube 5 and into the stent cannula 1. According to the imaging, the stent guide tube 5 is withdrawn at a uniform speed. As the stent guide tube 5 is withdrawn, the stent cannula 1 is withdrawn simultaneously. At this time, the stent guide wire is pressed against the stent body 2, and as the stent cannula 1 is withdrawn, the stent body 2 separates from the stent cannula 1. As the stent cannula 1 separates from the stent body 2, the stent body 2 and its V-shaped support ribs 3 will gradually unfold and adhere to the arterial wall and be located near the aneurysm, providing support to the artery. The procedure is then continued to implant the coil into the aneurysm.

[0028] It should be noted that in the description of this specification, descriptions such as "first" and "second" are only used to distinguish the features and do not have any actual order or directional meaning. This application is not limited to this.

[0029] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.

[0031] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A stent for treating intracranial aneurysms, characterized in that, include: The bracket sleeve (1) and the bracket guide tube (5) are provided. The bracket body (2) is placed inside the bracket sleeve (1). Multiple support ribs (3) are fixedly arranged evenly on the bracket body (2). The bracket body (2) is sinusoidal and the multiple support ribs (3) are V-shaped.

2. The stent for treating intracranial aneurysms as described in claim 1, characterized in that, The surfaces of the support body (2) and the support ribs (3) are coated with a bio-coating (4).

3. The stent for treating intracranial aneurysms as described in claim 1, characterized in that, The bottom of the support sleeve (1) is conical (102), and the outer ring of the bottom of the support sleeve (1) is provided with external threads (103) at the conical (102).

4. The stent for treating intracranial aneurysms as described in claim 1, characterized in that, One end of the bracket guide tube (5) is a flared opening (501). The inner wall of the bracket guide tube (5) located at the flared opening (501) is provided with an internal thread groove (502). The internal thread groove (502) is adapted to the external thread (103) and can be disengaged from the threaded connection.

5. The stent for treating intracranial aneurysms as described in claim 4, characterized in that, The other end of the bracket guide tube (5) is fixedly connected to a handle (6), and one side of the handle (6) is fixedly connected to a connecting tube (7). Anti-slip stripes (601) are fixedly provided on both the upper and lower sides of the handle (6).

6. The stent for treating intracranial aneurysms as described in claim 1, characterized in that, The top outer ring of the support sleeve (1) is provided with a bevel (101).

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