A multi-section wire mesh support assembly

Abstract

The application discloses a multi-section dense net stent assembly, which comprises a lead-in sheath, the lead-in sheath is composed of an outer sheath and an inner sheath, an annular channel is formed between the outer sheath and the inner sheath, a main body stent is pressed in the annular channel, and a secondary body stent is pressed in the inner sheath; an outer layer guide wire is arranged in the lead-in sheath, a pushing block is fixed on the outer layer guide wire, the pushing block is located in the annular channel and slides, and the pushing block is connected with the inner sheath; and an inner layer guide wire is arranged in the lead-in sheath and connected with the secondary body stent, and is used for pushing the secondary body stent to slide in the inner sheath. The main body stent slides through the annular channel, the inner layer guide wire controls the main body stent, the outer layer guide wire controls the secondary body stent, the relative position between the main body stent and the secondary body stent is adjusted, the main body stent is released first, the secondary body stent is released after being aligned with an aneurysm opening, the stent is easy to be aligned with the aneurysm opening, and the operation difficulty is reduced.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a multi-segment dense mesh stent assembly. Background Technology

[0002] Flow diverting devices, with their finer mesh and stronger flow guidance capabilities compared to conventional intracranial stents, are more conducive to the growth of vascular endothelial cells. Through a design with high metal coverage and high mesh ratio, they reshape local blood flow, diverting the impact blood flow from the parent artery into the aneurysm into distal normal vessels, thereby reducing the impact of local blood flow on the aneurysm and improving the hemodynamics within the aneurysm. Among flow diverting devices, multi-segment stents are an important tool for interventional treatment of complex aneurysms. Current multi-segment stents often employ a design with a denser mesh in the middle and a sparser mesh at both ends. This design not only ensures high metal coverage at the aneurysm orifice, reducing blood flow into the aneurysm, but the sparser mesh at the ends also reduces the stent's impact on normal vessels and improves stent flexibility.

[0003] However, most existing multi-segment stents are designed as a single unit, and the position of the mesh segment within the overall stent is not adjustable. This design can cause self-expanding stents to retract due to elasticity during deployment, making it difficult for the mesh segment to completely cover the aneurysm opening. Furthermore, if the aneurysm is located in a branch vessel and close to the bifurcation between the main vessel and the branch vessel, the tail end of the multi-segment stent can easily intrude into the main vessel when the mesh segment covers the aneurysm opening, interfering with subsequent surgeries within the main vessel. All of these situations place a significant demand on the surgeon's experience.

[0004] Therefore, a multi-segment support with adjustable mesh segment position and a release component for releasing the support are needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-segment dense mesh stent assembly, which allows the main stent to slide through an annular channel, thereby adjusting the relative position between the main stent and the auxiliary stent, allowing the main stent to be released first, and the auxiliary stent to be released after being aligned with the aneurysm opening, thus solving the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-segment dense mesh support assembly, including an inlet sheath,

[0007] The inlet sheath consists of an outer sheath and an inner sheath, with an annular channel formed between the outer and inner sheaths. The main support is pressed within the annular channel, and the secondary support is pressed within the inner sheath.

[0008] An outer guidewire is disposed within the induction sheath. A push block is fixedly connected to the distal end of the outer guidewire. The push block is located within the annular channel and slides, and the push block is connected to the proximal end of the inner sheath.

[0009] The inner guidewire is located inside the induction sheath and is used to push the secondary support to slide within the inner sheath.

[0010] Preferably, the length of the inner sheath is less than that of the outer sheath, and the length of the inner sheath is greater than that of the secondary support.

[0011] Preferably, the push block is ring-shaped and can slide within the ring channel.

[0012] Preferably, the push block and the inner sheath are integrally formed.

[0013] Preferably, the push block is provided with a developing mark.

[0014] Preferably, the main support is a woven large-mesh support, the secondary support is a woven dense mesh support, and the metal coverage of the main support is lower than that of the secondary support.

[0015] Preferably, the metal coverage of the main support is 15%-25%, and the metal coverage of the secondary support is 25%-35%.

[0016] Preferably, the distal end of the outer guidewire is provided with multiple branches, and all branches are connected to the proximal end of the main support.

[0017] Preferably, a first developing point is provided on the main support.

[0018] Preferably, a second developing point is provided on the sub-body support.

[0019] The technical effects and advantages of this invention are as follows:

[0020] By setting up an annular channel to allow the main stent to slide, the inner guidewire controls the main stent and the outer guidewire controls the secondary stent, thereby adjusting the relative position between the main stent and the secondary stent. This allows the main stent to be released first, and the secondary stent to be released after being aligned with the aneurysm opening. This makes it easier for the dense network segment of the stent to cover the aneurysm opening, reducing the difficulty of the operation. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. Wherein:

[0022] Fig. 1 This is an overall structural diagram of Embodiment 1 of the present invention;

[0023] Fig. 2This is an exploded view of the outer and inner sheaths of the present invention;

[0024] Fig. 3 This is a diagram showing the state of the perforating artery sealed by the dense mesh stent of the present invention.

[0025] 1. Introducing sheath; 11. Outer sheath; 12. Inner sheath; 21. Outer guidewire; 22. Inner guidewire; 3. Main support; 4. Sub-support; 5. Push block; 6. Second developing point; 7. First developing point; 8. Developing marker. Detailed Implementation

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention are within the scope of protection of the present invention.

[0027] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0028] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] 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 technical features indicated. Therefore, a feature defined as "first" and "second" may explicitly or implicitly include one or more features.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. 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 or an electrical connection or a connection that allows communication between the two components; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components, an indirect connection, or an interaction between two components.

[0031] In the description of this invention, "distal" refers to the end that is farther from the doctor during surgery, and "proximal" refers to the end that is closer to the doctor during surgery.

[0032] In the description of this invention, "before use" refers to the state of the variable-diameter multi-segment thrombectomy stent before it is used, before it is inserted into the human body, or before it comes into contact with bodily fluids such as blood and tissue fluid in the human body. "During use" refers to the state of the variable-diameter multi-segment thrombectomy stent after it has been inserted into the human body or has come into contact with bodily fluids such as blood and tissue fluid in the human body.

[0033] This invention provides a multi-segment dense mesh support assembly; please refer to [link / reference]. Figs. 1-3 It includes an inlet sheath 1, which is composed of an outer sheath 11 and an inner sheath 12. An annular channel is formed between the outer sheath 11 and the inner sheath 12. The annular channel is used to press the main support 3, and the inner sheath 12 is used to press the secondary support 4.

[0034] The outer guide wire 21 is located inside the inlet sheath 1. A push block 5 is fixed on the outer guide wire 21. The push block 5 is located in the annular channel and slides. The push block 5 is connected to the inner sheath 12.

[0035] The inner guide wire 22 is located inside the inlet sheath 1 and is connected to the auxiliary body support 4, used to push the auxiliary body support 4 to slide within the inner sheath 12.

[0036] The main support 3 and the secondary support 4 are woven from nickel-titanium alloy wire.

[0037] The outer guidewire 21 is used to move the pusher block 5. After the main stent 3 and the auxiliary stent 4 are moved to the aneurysm neck position, the main stent 3, being longer, unfolds to cover the aneurysm neck opening, while the auxiliary stent 4 can precisely close the aneurysm neck opening, providing good guidance for blood flow. In use, the outer guidewire 21 is first pushed to move the pusher block 5 and the inner sheath 12 distally. After the main stent 3 is pushed and released, and the aneurysm neck position is located and covered, the inner guidewire 22 is pushed distally, allowing the auxiliary stent 4 to be released from the inner sheath 12. The unfolded auxiliary stent 4 can precisely cover the aneurysm opening, thus reducing the difficulty of the surgery. By setting up the annular channel and the pusher block 5, the relative position between the main stent 3 and the auxiliary stent 4 can be adjusted, ensuring that the auxiliary stent 4 can stably cover the aneurysm opening, solving the problem of the dense mesh segment being difficult to align with the aneurysm opening requiring stent coverage.

[0038] In a preferred embodiment of the present invention, the length of the inner sheath 12 is less than that of the outer sheath 11, and the length of the inner sheath 12 is greater than that of the secondary support 4. By making the length of the inner sheath 12 greater than that of the secondary support 4, the secondary support 4 can remain in a gripping state during the sliding process of the inner sheath 12, thus preventing the secondary support 4 from being released prematurely.

[0039] In a preferred embodiment of the present invention, the push block 5 is annular and can slide within the annular channel. The push block 5 can provide a stable and uniform thrust, allowing the main support 3 to be released stably. In other embodiments of this application, the push block 5 can also be elongated, as long as it can slide freely along the length of the annular channel.

[0040] In a preferred embodiment of the present invention, the push block 5 and the inner sheath 12 are integrally formed. The push block 5 and the inner sheath 12 can be made of the same material, and integral forming reduces the processing difficulty of the push block 5 and the inner sheath 12.

[0041] In a preferred embodiment of the present invention, the push block 5 is provided with a radiopaque marker 8. The radiopaque marker 8 can be made of a radiopaque material such as nickel-titanium metal or cobalt-chromium metal, and is used to assist the doctor in determining the position of the push block 5.

[0042] In a preferred embodiment of the present invention, the main support 3 is a woven large-mesh support, and the secondary support 4 is a woven dense mesh support. The metal coverage of the main support 3 is lower than that of the secondary support 4.

[0043] In a preferred embodiment of the present invention, the metal coverage of the main stent 3 is 15%-25%, and the metal coverage of the auxiliary stent 4 is 25%-35%. Excessively dense mesh in the auxiliary stent 4 can lead to perforator occlusion, thereby causing ischemic stroke or neurological deficits. The main stent 3, with its larger mesh compared to the auxiliary stent 4, covers the aneurysm site with minimal impact on blood flow. Furthermore, the longer length of the main stent 3 allows it to cover the aneurysm in the branch vessels, improving the anchoring effect.

[0044] In a preferred embodiment of the present invention, the distal end of the outer guidewire 21 is provided with multiple branches, and all branches are connected to the proximal end of the main support 3. By providing the outer guidewire 21 with multiple branches, a stable thrust is provided to the push block 5. The main support 2 is released first, followed by the secondary support 4. The fit between the main support 2 and the secondary support 4 and the interior is observed by angiography.

[0045] In a preferred embodiment of the present invention, a first developing point 7 is provided on the main support 3. The first developing point 7 is used to indicate the position of the main support 3.

[0046] In a preferred embodiment of the present invention, a second radiopaque point 6 is provided on the secondary stent 4, which is used to indicate the position of the secondary stent 4. The first radiopaque point 7 and the second radiopaque point 6 can assist the doctor in determining the positional relationship between the main stent 3 and the secondary stent 4. Both the first radiopaque point 7 and the second radiopaque point 6 are welded and fixed.

[0047] Example 1:

[0048] Please see Figs. 1-3A multi-segment dense mesh support assembly includes an inlet sheath 1, which is composed of an outer sheath 11 and an inner sheath 12. An annular channel is formed between the outer sheath 11 and the inner sheath 12. The annular channel holds the main support 3, and the inner sheath 12 holds the secondary support 4.

[0049] The outer guide wire 21 is located inside the inlet sheath 1. A push block 5 is integrally formed on the outer guide wire 21. The push block 5 is located in the annular channel and slides, and the push block 5 is connected to the inner sheath 12.

[0050] The inner guide wire 22 is located inside the inlet sheath 1 and is connected to the auxiliary body support 4, used to push the auxiliary body support 4 to slide within the inner sheath 12.

[0051] The main support 3 and the secondary support 4 are woven from nickel-titanium alloy wire.

[0052] The push block 5 is ring-shaped and can slide within the ring channel. Push block 5 provides a stable and uniform pushing force, allowing the main support 3 to be released stably. A radiopaque marker 8 is welded onto push block 5. The radiopaque marker 8 can be made of radiopaque materials such as nickel-titanium or cobalt-chromium, to assist the doctor in determining the position of push block 5.

[0053] The inner sheath 12 is shorter than the outer sheath 11, and the inner sheath 12 is longer than the secondary support 4. During the sliding of the inner sheath 12, the secondary support 4 can maintain a gripping state, preventing premature release of the secondary support 4.

[0054] The metal coverage of the main stent 3 is 15%-25%, while that of the secondary stent 4 is 25%-35%. Excessively dense mesh in the secondary stent 4 can lead to perforator occlusion, resulting in ischemic stroke or neurological deficits. In contrast, the mesh of the main stent 3 is larger than that of the secondary stent 4. The main stent 3 covers the site of the aneurysm with minimal impact on blood flow. Furthermore, the longer length of the main stent 3 allows it to cover the aneurysm in the branch vessels, improving anchoring effectiveness.

[0055] The outer guidewire 21 is used to move the pusher block 5. After the main stent 3 and the auxiliary stent 4 are moved to the aneurysm neck position, the main stent 3, being longer, unfolds to cover the aneurysm neck opening, while the auxiliary stent 4 can precisely close the aneurysm neck opening, providing good guidance for blood flow. In use, the outer guidewire 21 is first pushed to move the pusher block 5 and the inner sheath 12 distally. After the main stent 3 is pushed and released, and the aneurysm neck position is located and covered, the inner guidewire 22 is pushed distally, allowing the auxiliary stent 4 to be released from the inner sheath 12. The unfolded auxiliary stent 4 can precisely cover the aneurysm opening, thus reducing the difficulty of the surgery. By setting up the annular channel and the pusher block 5, the relative position between the main stent 3 and the auxiliary stent 4 can be adjusted, ensuring that the auxiliary stent 4 can stably cover the aneurysm opening, solving the problem of the dense mesh segment being difficult to align with the aneurysm opening requiring stent coverage.

[0056] The distal end of the outer guidewire 21 is provided with multiple branches, and all branches are connected to the proximal end of the main support 3. By providing the outer guidewire 21 with multiple branches, a stable thrust is provided to the push block 5. The main support 2 is released first, followed by the secondary support 4. The angiography is used to observe the fit between the main support 2 and the secondary support 4 and the interior.

[0057] The proximal end of the outer guidewire 21 is set parallel to the inner guidewire 22.

[0058] A first radiopaque point 7 is provided on the main support 3. The first radiopaque point 7 is used to indicate the position of the main support 3. A second radiopaque point 6 is provided on the secondary support 4. The second radiopaque point 6 is used to indicate the position of the secondary support 4. The first radiopaque point 7 and the second radiopaque point 6 can help doctors determine the positional relationship between the main support 3 and the secondary support 4.

[0059] In summary, this invention, by setting up independent main stent 3 and auxiliary stent 4, first pushes the outer guidewire 21 to move the push block 5 and inner sheath 12 distally. After the main stent 3 is pushed, it is released. Then, the outer guidewire 21 is used to continue adjusting the position of the inner sheath 12, so that the inner sheath 12 is positioned and covers the aneurysm neck. Then, the inner guidewire 22 is pushed distally, allowing the auxiliary stent 4 to be released from the inner sheath 12. The deployed auxiliary stent 4 can accurately cover the aneurysm orifice, thereby reducing the difficulty of the operation. At the same time, the relative position between the main stent 3 and the auxiliary stent 4 can be adjusted to ensure that the auxiliary stent 4 can stably cover the aneurysm orifice, solving the problem of difficulty in aligning the dense network segment with the aneurysm orifice.

[0060] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-segment dense mesh support assembly, characterized in that: Including the inlet sheath (1), The inlet sheath (1) is composed of an outer sheath (11) and an inner sheath (12). An annular channel is formed between the outer sheath (11) and the inner sheath (12). The main support (3) is pressed in the annular channel, and the secondary support (4) is pressed inside the inner sheath (12). An outer guidewire (21) is disposed inside the induction sheath (1). A push block (5) is fixedly connected to the distal end of the outer guidewire (21). The push block (5) is located in the annular channel and slides. The push block (5) is connected to the proximal end of the inner sheath (12). The inner guide wire (22) is located inside the inlet sheath (1) and is used to push the sub-body support (4) to slide inside the inner sheath (12); The push block (5) is ring-shaped and can slide within the ring channel; The main support (3) is a woven large mesh support, and the secondary support (4) is a woven dense mesh support. The metal coverage of the main support (3) is lower than that of the secondary support (4). When in use, the main stent (3) is first released distally. After the main stent (3) is released, it is positioned and covers the neck of the aneurysm. Then, the secondary stent (4) is pushed distally and released from the inner sheath (12). The deployed secondary stent (4) precisely covers the aneurysm opening.

2. The multi-segment dense mesh support assembly according to claim 1, characterized in that, The inner sheath (12) is shorter than the outer sheath (11), and the inner sheath (12) is longer than the subbody support (4).

3. The multi-segment dense mesh support assembly according to claim 1, characterized in that, The push block (5) and the inner sheath (12) are integrally formed.

4. A multi-segment dense mesh support assembly according to claim 3, characterized in that, The push block (5) is provided with a developing mark (8).

5. A multi-segment dense mesh support assembly according to claim 1, characterized in that, The metal coverage of the main support (3) is 15%-25%, and the metal coverage of the secondary support (4) is 25%-35%.

6. A multi-segment dense mesh support assembly according to claim 5, characterized in that, The distal end of the outer guidewire (21) is provided with multiple branches, and all branches are connected to the proximal end of the main support (3).

7. A multi-segment dense mesh support assembly according to any one of claims 1-6, characterized in that, The first developing point (7) is provided on the main support (3).

8. A multi-segment dense mesh support assembly according to any one of claims 1-6, characterized in that, The second developing point (6) is provided on the sub-body support (4).

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