Windowing support and support system

Abstract

The application provides a fenestrated stent and a stent system, and relates to the technical field of medical devices. The stent body has a deformation capability. The stent body is internally provided with a stent space penetrating through both ends. The stent covering is arranged on the stent body. The film surface of the stent covering is provided with a constraint area. At least one fenestration is arranged in the constraint area of the stent covering. The constraint assembly is configured to constrain the synchronous deformation of the constraint area of the stent covering and the stent body. The constraint area of the stent covering and the corresponding area of the stent body can be relatively contracted in the radial direction to form a temporary subsidence space, which provides sufficient space for superselective treatment of branch blood vessels. Even if the reserved fenestration position on the fenestrated stent cannot completely match the branch opening, the effective establishment of the branch channel and the effective reconstruction of the branch blood vessel can still be ensured, and the arch branch blood supply is maintained, which can significantly improve the safety and effectiveness of the fenestrated stent during implantation.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to fenestrated stents and stent systems. Background Technology

[0002] Thoracic aortic diseases, including aortic aneurysms, aortic dissections, intramural hematomas, and penetrating ulcers, are critical emergencies that seriously threaten people's lives and health. With the continuous development of endovascular treatment techniques and interventional devices, endovascular thoracic aortic repair (TEVAR) has become the preferred treatment for thoracic aortic diseases. The principle of endovascular thoracic aortic repair is to use a fenestrated stent to isolate the diseased area. The fenestrated stent absorbs the blood flow pressure, preventing the blood vessel from rupturing.

[0003] However, endovascular treatment remains a significant challenge for aortic diseases involving branches of the aortic arch. Endovascular repair with fenestrated stents typically requires 20mm of healthy vessel as an anchoring zone, but lesions involving branch areas lack sufficient anchoring zone length, making conventional straight stents ineffective.

[0004] Fenistral stenting is an effective way to treat aortic lesions involving branch regions. Fenistral stents extend the anchoring zone of the stent to the branch region by pre-fenestrating the intended vessel location, without obstructing the blood supply to the branch, thus effectively isolating the lesion area. It has become the main method for endovascular treatment of diseases involving aortic arch branch regions.

[0005] However, existing fenestrated stents generally have the following problems: after the fenestrated stent is released into the aortic arch, due to the three-dimensional shape of the aortic arch being curved and tortuous, and the inevitable deviations in the positioning and release of the fenestrated stent, even if the fenestrated stent can be customized according to the patient's anatomy, the reserved fenestration on the stent is still difficult to completely align with the openings of the branch vessels of the aortic arch, and there may even be unexpected complete occlusion of branch vessels.

[0006] If the branch openings cannot be perfectly aligned, it will significantly increase the difficulty of subsequent superselection and reconstruction of branch vessels, leading to ischemia and stroke in the supra-aortic branches. Complete occlusion of the branch openings will prevent superselection and reconstruction of branch vessels, resulting in serious complications such as stroke, conversion to open surgery, or even intraoperative death. Therefore, there is an urgent clinical need for a new fenestration stent technique to achieve safe and effective reconstruction of supra-aortic branches. Summary of the Invention

[0007] Therefore, it is necessary to provide a window opening bracket and bracket system to address the aforementioned technical problems.

[0008] This application provides a window opening bracket, the window opening bracket comprising:

[0009] The support body has deformation capability, and the interior of the support body is provided with an internal space that extends through both ends;

[0010] The bracket is covered with a membrane, which is disposed on the surface of the bracket body. A constraint area is provided on the surface of the membrane, and at least one window is opened within the constraint area of ​​the bracket.

[0011] A constraint component configured to constrain the constraint area of ​​the stent cover to deform synchronously with the stent body.

[0012] In one embodiment, the constrained area of ​​the stent membrane is movably disposed relative to the stent body, and other areas of the stent membrane outside the constrained area are fixedly connected to the stent body; and / or,

[0013] The areas outside the constrained region of the stent membrane are configured to deform synchronously with the stent body.

[0014] In one embodiment, the constraint component includes:

[0015] A control element configured to be detachably connected to a constraint region of the support film, thereby constraining the constraint region to deform synchronously with the support body, or allowing the constraint region to deform synchronously with the support body.

[0016] In one embodiment, the control element is detachably connected to at least one of the support body and the support cover;

[0017] And / or, the stent body and the stent cover are provided with a large bend side and a small bend side, the constraint area is located on the large bend side of the stent cover, and the control element is provided on the small bend side of at least one of the stent body and the stent cover;

[0018] And / or, the control element is configured as a linear element for threading through the support membrane.

[0019] In one embodiment, the constraint component includes:

[0020] A first connector is disposed on the large bend side of the support membrane, and the control element is configured for detachable connection with the first connector; and / or

[0021] A second connector is disposed on the small bend side of at least one of the support body and the support cover, and the control element is configured to be detachably connected to the second connector.

[0022] In one embodiment, at least one of the first connector and the second connector is configured to connect a coil, and the control element is configured to pass through at least one of the first connector and the second connector; and / or,

[0023] The control element includes a first control line and a second control line connected together, the first control line being configured to be detachably connected to the first connector, and the second control line being configured to be detachably connected to the second connector.

[0024] In one embodiment, the second control line is configured to lock or release the detachable connection between the first control line and the first connector;

[0025] And / or, the length of the first control line is less than the diameter of the bracket body;

[0026] And / or, the second control line is provided with a connection point, and the first control line is connected to the connection point of the second control line, wherein the distance from the connection point to the proximal end of the second control line is less than that of the first control line.

[0027] In one embodiment, the first control line is provided with a constraint coil, and the second control line is configured to pass through the constraint coil, thereby locking or releasing the detachable connection between the first control line and the first connector; and / or

[0028] The length of the first control line is less than the radius of the support body.

[0029] In one embodiment, the support body includes a plurality of support rings, which are connected sequentially along the axial direction of the support body. Each support ring includes a plurality of unit edges, which are connected sequentially along the circumferential direction of the support ring. The unit edges have deformability. The window openings of the support film do not radially overlap with any of the support rings of the support body.

[0030] This application provides a support system, the support system comprising:

[0031] The window opening bracket;

[0032] A conveying device configured to convey the window opening bracket.

[0033] In the aforementioned fenestrated stent and stent system, because the constraint component restricts the synchronous deformation of the constraint area of ​​the stent cover relative to the corresponding area of ​​the stent body, the constraint area of ​​the stent cover can conversely constrain the corresponding area of ​​the stent body. This allows the constraint area of ​​the stent cover and the corresponding area of ​​the stent body to radially contract relative to each other, creating a temporary sinking space. This temporary sinking space prevents the fenestrated stent's fenestrated opening from completely adhering to the wall, providing sufficient space for branch vessel superselection. Even if the reserved fenestrated opening on the fenestrated stent cannot completely align with the branch opening, effective establishment of the branch channel and effective reconstruction of the branch vessel can still be ensured. Simultaneously, during branch vessel superselection and reconstruction, sufficient blood supply to the supra-arc branches is maintained. By constructing the temporary sinking space, the safety and effectiveness of the fenestrated stent during implantation can be significantly improved. Attached Figure Description

[0034] Figure 1 This is a front view of a window opening bracket provided in one embodiment of this application.

[0035] Figure 2 For example Figure 1 The top view of the window opening bracket shown.

[0036] Figure 3 This is a schematic diagram of the structure of a control element provided in one embodiment of this application.

[0037] Figure 4 For example Figure 3 The control element shown acts as follows Figure 1 The diagram shows the usage status of the window opening bracket.

[0038] Figure 5 For example Figure 4 The side view showing the control element in use.

[0039] Figure 6 , Figure 7 , Figure 8 and Figure 9 This is a step-by-step schematic diagram illustrating the implantation process of a fenestrated stent provided in one embodiment of this application.

[0040] Icon labels:

[0041] 01. Window opening bracket; 02. External branch bracket; 03. Conveying device; 04. Guide wire; 05. Branch bracket;

[0042] 11. Scaffold covering; 11A. Constraint area; 12. Scaffold body; 13. Scaffold ring;

[0043] 111. Openwork window design;

[0044] 112. First connecting component;

[0045] 113. Second connector;

[0046] 21. External coating; 22. External main body;

[0047] 31. Control elements;

[0048] 311, First control line; 312, Second control line; 3111, Constraint coil; 3112, Connection point. Detailed Implementation

[0049] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0050] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0051] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0055] See Figure 1 and Figure 2 As shown, this application provides a window opening bracket 01, which can be referred to. Figure 1 and Figure 2In the diagram of the aforementioned window opening bracket 01, the left end is defined as the proximal end of the window opening bracket 01, and the right end is defined as the distal end. The window opening bracket 01 includes a bracket body 12, a bracket covering 11, and constraint components. The bracket body 12 possesses deformation capability, which allows for corresponding frame deformation under different stress states. For example, under stress, it may retract or deform, transforming into a contracted state; after the stress is removed, it may recover and revert to its original expanded state. This deformation capability can be elastic or other types, such as damping deformation. Furthermore, the deformation capability of the bracket body 12 can be obtained based on the material or the structural design. Those skilled in the art can select the type and characteristics of the deformation capability of the bracket body 12 according to actual needs, and no limitations are imposed here.

[0056] The interior of the support body 12 can be configured with a through-space at both ends. For example, the support body 12 has a proximal end and a distal end, and the through-space can extend through both ends of the support body 12 (i.e., through-space at both ends), thus constructing the support body 12 as a cylindrical structure. It should be noted that the surface of the support body 12 is not a sealed surface, and therefore the through-space of the support body 12 is not a sealed space either. Depending on the different structural designs of the support body 12, the through-space of the support body 12 is actually a space enclosed by the mechanical structure of the support body 12.

[0057] The support film 11 is disposed on the frame surface of the support body 12. In the support film 11 provided in this application, a constraint region 11A may be provided on the film surface of the support film 11. The constraint region 11A is a part of the film surface of the support film 11. In addition to the aforementioned constraint region 11A, other areas on the film surface of the support film 11 can be referred to as release areas (or non-constraint areas). In one embodiment, the window bracket 01 may be provided with a large bend side and a small bend side, and the constraint region 11A is located on the large bend side of the support film 11. At this time, at least one window opening 111 can be opened in the constraint region 11A of the support film 11 as needed. The size, shape, etc. of the window opening 111 can be designed according to needs and are not limited here.

[0058] Regarding the structural design of the aforementioned support body 12, in one embodiment, the support body 12 may include a plurality of support rings 13 in the axial direction, such that the plurality of support rings 13 can be sequentially connected along the axial direction of the support body 12 to form the support body 12. Moreover, each support ring 13 constituting the support body 12 may include a plurality of unit edges in the circumferential direction, and the plurality of unit edges are sequentially connected along the circumferential direction of the support ring 13. The unit edges may be approximately V-shaped, or the unit edges may be designed as other curved structures, so that the unit edges themselves also have deformation capabilities. Therefore, the deformation capability of the support body 12 includes the radial deformation of at least a portion of the unit edges of at least a portion of the support rings 13 within the constraint region 11A, provided by the deformation capability of the unit edges.

[0059] Therefore, based on the structural design of the support body 12, the window opening 111 of the support film 11 does not radially overlap with any of the support rings 13 of the support body 12, thereby ensuring that the window opening 111 on the support film 11 can avoid over-selection space.

[0060] Since the fenestration 111 of the existing fenestrated stent 01 cannot be perfectly aligned during superselection, mainly due to window deviation caused by the physical morphology of the aortic arch and window displacement during the positioning and release of the fenestrated stent 01, it is generally not possible to solve this problem simply by customizing a precise fenestration 111 based on the patient's anatomy. Therefore, the main technical concept of the technical solution provided in this application is to establish a fault-tolerant mechanism so that when the fenestration 111 of the fenestrated stent 01 cannot be perfectly aligned with the opening of the supra-arch branch, superselection and reconstruction of the branch vessels can still be achieved, and then the alignment of the window can be corrected by the branch stent 05.

[0061] In response, this application provides a constraint component that can be configured to constrain the constraint region 11A of the stent cover 11 to deform synchronously with the stent body 12.

[0062] To correctly understand the aforementioned synchronous deformation constraint, it is first necessary to define the synchronous deformation mentioned above. That is, since the stent membrane 11 is disposed on the stent body 12, it actually covers the surface of the stent body 12. Therefore, based on the deformation capability of the stent body 12, when the stent body 12 is compressed under force or expands again after the force is removed, the transformation of the stent body 12 will cause the stent membrane 11 to undergo synchronous deformation; that is, the stent body 12 causes the stent membrane 11 to undergo corresponding synchronous deformation simultaneously.

[0063] The constraint of this synchronous deformation, i.e., resisting this synchronous deformation, can also be understood as avoiding or preventing the constraint area 11A of the constraint stent membrane 11 from undergoing synchronous deformation with the stent body 12 to a certain extent.

[0064] When the constraint component of this application acts on the constraint region 11A of the stent cover 11, the effect of the constraint component is to constrain (resist, avoid, or prevent) the synchronous deformation of the constraint region 11A of the stent cover 11 relative to the stent body 12. This can also be described as the ability to constrain the synchronous deformation of the constraint region 11A of the stent cover 11. Within the constraint region 11A of the stent cover 11, the constraint region 11A is subject to a certain degree of restriction as it deforms synchronously with the stent body 12.

[0065] In one embodiment, the constraint region 11A of the stent cover 11 is movably disposed relative to the stent body 12, while other regions of the stent cover 11 other than the constraint region 11A are fixedly connected to the stent body 12. Since the constraint region 11A of the stent cover 11 is not fixedly connected to the stent body 12, it can be more flexible relative to other regions. It will not deform synchronously with the corresponding region of the stent body 12 (i.e., the region where the surface of the stent body 12 overlaps with the constraint region 11A of the stent cover 11 when the stent cover 11 covers the frame surface of the stent body 12). Instead, it can exert a force on the stent body 12 under external force, limiting its deformation capability. Simultaneously, since other regions of the stent cover 11 other than the constraint region 11A are fixedly connected to the stent body 12, these other regions can be configured to deform synchronously with the stent body 12.

[0066] Because the constraint components restrict the synchronous deformation of the constraint region 11A of the stent membrane 11 relative to the corresponding region of the stent body 12, the constraint region 11A of the stent membrane 11 can conversely constrain the corresponding region of the stent body 12. This can also be equivalent to constraining the deformation capacity of the stent body 12 to a certain extent, that is, constraining the deformation capacity of the corresponding region of the stent body 12, so that the constraint region 11A of the stent membrane 11 and the corresponding region of the stent body 12 can deform as... Figure 1 The temporary sinking space is created by relative contraction in the radial direction. In one embodiment, the constraint component can be configured to constrain the synchronous deformation capability of at least a portion of at least a portion of the constraint region 11A of the support membrane 11. Those skilled in the art can design the degree of constraint and the range of the covered area according to actual needs, which is not limited here.

[0067] The aforementioned temporary depression space prevents the fenestrated stent 01 from completely adhering to the wall, providing ample space for branch vessel superselection. Even if the reserved fenestrated stent 01 cannot perfectly align with the branch opening, effective establishment of the branch channel and effective reconstruction of the branch vessel are still ensured. Simultaneously, sufficient blood supply to the supra-arch branches is maintained during branch vessel superselection and reconstruction. The construction of the temporary depression space significantly improves the safety and effectiveness of the fenestrated stent 01 during implantation.

[0068] The constraint components can constrain the constraint area 11A of the stent membrane 11 and the corresponding area of ​​the stent body 12 to deform synchronously in various ways. For example, they can apply constraint forces to the constraint area 11A of the stent membrane 11 and the corresponding area of ​​the stent body 12 by means of binding, buckling, clamping, bonding, etc., thereby achieving the constraint of synchronous deformation of the constraint area 11A of the stent membrane 11 and the corresponding area of ​​the stent body 12. No limitation is made here.

[0069] See Figure 3 As shown, in one embodiment, the constraint assembly may include a control element 31, which may be detachably connected to at least one of the support body 12 and the support membrane 11. Here, the limitation lies in the arrangement of the control element 31 relative to the support body 12 and the support membrane 11; that is, the control element 31 may be disposed on or detached from the support body 12 and the support membrane 11. Furthermore, the support body 12 and the support membrane 11 may have a large bend side and a small bend side, with the constraint region 11A located on the large bend side of the support membrane 11, and the control element 31 disposed on the small bend side of at least one of the support body 12 and the support membrane 11. Therefore, those skilled in the art can select the arrangement and location of the control element 31 according to their needs, and no limitation is made here.

[0070] The control element 31 can be partially located outside the body after the stent body 12 is implanted, thus allowing for external manipulation of the control element 31. For example, the control element 31 can be configured as a linear element, allowing it to be used to penetrate the stent cover 11. The linear element can be a medical filament commonly used in the medical field, used for linearly penetrating and wrapping at least a portion of the constraint region 11A of the stent cover 11, thereby constraining the synchronous deformation capability of the constraint region 11A of the stent cover 11, which is not limited here.

[0071] Wherein, after the control element 31 passes through and wraps around the constraint area 11A of the stent cover 11, the wrapping and binding of the stent cover 11 by the control element 31 can be a loose knot binding, that is, to achieve the constraint of the stent cover 11 under a specific state, and to release the constraint of the stent cover 11 under a specific state. For example, the way to release the constraint can be that the deformation capacity of the stent body 12 acts in the opposite direction on the constraint area 11A of the stent cover 11, breaking free from the constraint of the control element 31 and thus releasing the constraint.

[0072] In this embodiment, the main function of the control element 31 is to be detachably connected to the constraint region 11A of the stent cover 11. The detachable connection can be achieved through various methods such as binding, snapping, clamping, or bonding, and is not limited here. Since the control element 31 can be connected to the constraint region 11A of the stent cover 11, a force (constraint force) can be applied to the constraint region 11A, thereby constraining the constraint region 11A to deform synchronously with the stent body 12. Simultaneously, the control element 31 can also be detached from the constraint region 11A of the stent cover 11, thereby removing the force (constraint force) applied to the constraint region 11A of the stent cover 11, and allowing the constraint region 11A to deform synchronously with the stent body 12.

[0073] See Figures 3 to 5 As shown, in one embodiment, the constraint assembly may further include at least one of a first connector 112 and a second connector 113, and the number of the first connector 112 and the second connector 113 may be one or more, which is not limited here. The first connector 112 is disposed on the large bend side of the support film 11, and the control element 31 may be configured to be detachably connected to the first connector 112. In this case, the main function of the control element 31 is defined. The second connector 113 is disposed on the small bend side of at least one of the support body 12 and the support film 11, and the control element 31 may be configured to be detachably connected to the second connector 113, thereby determining the placement position of the control element 31 on the support body 12 and the support film 11, that is, positioning the control element 31 on the small bend side of the support body 12 and the support film 11. In this case, the placement method of the control element 31 relative to the support body 12 and the support film 11 is defined.

[0074] The control element 31 can be detachably connected to the first connector 112 or the second connector 113 in various ways, such as binding, snapping, clamping, bonding, or threading, and is not limited thereto. In one embodiment, at least one of the first connector 112 and the second connector 113 is configured as a connecting coil, and the control element 31 is configured to thread through at least one of the first connector 112 and the second connector 113.

[0075] Furthermore, regarding the design of the control element 31, the control element 31 may also include a connected first control line 311 and a second control line 312. The first control line 311 may be made of a polymer material, such as PE or PP, and may also be made of multi-strand braided wire to give it a soft and smooth characteristic. The second control line 312 may be made of metal guide wire, such as nickel-titanium alloy or stainless steel, and may be laid in the conveying device 03 and retracted by operation.

[0076] At this time, the first control line 311 is configured to be detachably connected to the first connector 112, and the second control line 312 is configured to be detachably connected to the second connector 113. After the first control line 311 constrains the constraint area 11A of the support film 11 with synchronous deformation capability, the second control line 312 can be snapped together with the first control line 311 to lock the current constraint state of the first control line 311.

[0077] After the user withdraws the second control line 312 from outside the body, the second control line 312 can be separated from the first control line 311, thereby releasing the constraint on the first control line 311. At this time, the first control line 311 can be released under the deformation capability of the stent body 12, releasing the constraint on the constraint area 11A of the stent cover 11.

[0078] Regarding the cooperation between the first connector 112, the second connector 113, the first control line 311, and the second control line 312, in one embodiment, the second control line 312 may also be configured to lock or release the detachable connection between the first control line 311 and the first connector 112. In this embodiment, the first control line 311 can be detachably connected to the first connector 112 by means of threading, thereby constraining the constraint area 11A of the stent cover 11. However, the first control line 311 is not locked at this time; that is, once the deformation capability of the stent body 12 acts in the opposite direction on the constraint area 11A of the stent cover 11, the constraint area 11A of the stent cover 11 can break free from the constraint of the first control line 311.

[0079] In this embodiment, the second control line 312 is configured to lock or release the detachable connection between the first control line 311 and the first connector 112. Therefore, when the first control line 311 is connected to the first connector 112 to constrain the constraint area 11A of the stent cover 11, the second control line 312 can lock this state, maintaining the constraint on the constraint area 11A of the stent cover 11. When it is necessary to release the constraint on the constraint area 11A of the stent cover 11, the connection between the first control line 311 and the first connector 112 can be released via the second control line 312. This allows for flexible control of the constraint or release of the constraint area 11A of the stent cover 11, enabling flexible control of the stent body 12's state during surgery.

[0080] The second control line 312 is detachably connected to the second connector 113, thereby determining the position of the second control line 312 on the bracket body 12 and the bracket cover 11, that is, positioning the second control line 312 on the small bend side of the bracket body 12 and the bracket cover 11. Therefore, when the second control line 312 is connected to the first control line 311 by a snap fastener, the first control line 311 can be pulled towards the small bend side of the bracket body 12 and the bracket cover 11, thus locking the current constraint state of the first control line 311. Especially when the first connector 112 is a connecting coil, the first control line 311 passes through the first connector 112. In this case, pulling the first control line 311 towards the small bend side of the bracket body 12 and the bracket cover 11 by the second control line 312 can prevent the first control line 311 from coming out of the first connector 112, thus locking the current constraint state of the first control line 311.

[0081] Regarding the detachable connection between the first control line 311 and the second control line 312, various methods can be employed, such as threading, snap-fitting, and bonding. In one embodiment, the first control line 311 may be provided with a constraint coil 3111, and the second control line 312 is configured to pass through the constraint coil 3111, thereby locking or releasing the detachable connection between the first control line 311 and the first connector 112. Alternatively, holes can be drilled in the first control line 311 to form the aforementioned constraint holes, as required; this is not limited to this method.

[0082] The length of the first control line 311 can be adjusted according to the diameter of the support body 12. In one embodiment, the length of the first control line 311 can be designed to be smaller than the diameter of the support body 12, or the length of the first control line 311 can be smaller than the radius of the support body 12. Those skilled in the art can choose according to actual needs, and no limitation is made here. Moreover, a connection point 3112 can be provided on the second control line 312, and the first control line 311 and the second control line 312 are connected at the connection point 3112. The distance from the connection point 3112 to the proximal end of the second control line 312 is less than that of the first control line 311. This connection point 3112 is actually a virtual position of the second control line 312. This connection point 3112 may or may not have any obvious markings or structural design; it is merely a designed position.

[0083] Therefore, by cooperating with the first connector 112, the second connector 113, the first control line 311 and the second control line 312, the synchronous deformation capability constraint or release of the synchronous deformation capability constraint of the constraint area 11A of the stent film 11 can be achieved.

[0084] The aforementioned constraint components constrain the constraint area 11A of the stent membrane 11, which is actually a localized constraint effect on the stent body 12. That is, the constraint area 11A of the stent membrane 11 constrains the corresponding area of ​​the stent body 12, so that the corresponding area of ​​the stent body 12 forms a temporary sinking space.

[0085] In an embodiment where the support body 12 includes several support rings 13, if a portion of the support rings 13 that defines a corresponding area of ​​the support body 12 is called a constrained support ring, and the remaining support rings 13 of the support body 12 are called unconstrained support rings, then the local beam diameter effect mainly occurs when the window support 01 is released at the expected position, the unconstrained support rings fully unfold, while the constrained support rings can produce a local beam diameter effect under the constraint of the constraining components, so that their diameter is constrained and not fully unfolded.

[0086] Meanwhile, if a portion of the unit edges of the corresponding area of ​​the support body 12 is called a constrained unit edge, and the remaining unit edges of the support body 12 are called unconstrained unit edges, then even if some constrained support rings are within the constrained area 11A in the axial direction, the unit edges outside the constrained area 11A in these constrained support rings are not constrained. That is, the above-mentioned local beam diameter effect does not act uniformly on all unit edges of the constrained support ring, but only on the constrained unit edges around the window opening 111 position on the large bend side, and not on the unconstrained unit edges on the small bend side.

[0087] Therefore, the above-mentioned constraints allow the greater curvature side of the constraint area 11A of the fenestrated stent 01 to present a temporary downward space, and the constraint area 11A does not adhere to the branch vessels of the aortic arch, thereby generating sufficient branch overselection space, significantly improving the fault tolerance of fenestration alignment, and effectively avoiding the occurrence of unintended coverage of the aortic arch branches after the fenestrated stent 01 is released.

[0088] This application provides a support system, which may include the aforementioned window opening support 01 and a conveying device 03, the conveying device 03 being configured to convey the window opening support 01. Since the specific structure, functional principle, and technical effects of the aforementioned window opening support 01 have been described in detail above, they will not be repeated here. Any technical details regarding the aforementioned window opening support 01 can be found in the foregoing description.

[0089] See Figures 6 to 9 As shown, in one embodiment, Figure 6 This is a simplified constraint diagram of the window opening bracket 01 and the conveying device 03 in the window opening cutout 111 area. The second control line 312 is located on the small bend side of the bracket body 12 and the bracket covering film 11. The second control line 312 and the first control line 311 simultaneously pass through a second connector 113 located on the small bend side. Then, the second control line 312 continues to pass separately through a second second connector 113 located on the small bend side in the forward direction.

[0090] At this point, the first control line 311 passes through the coil of the first connector 112 located on the large bend side. Then, the second control line 312 passes through the constraint coil 3111 on the first control line 311, and then continues to pass separately through the third second connector 113 located on the small bend side in the forward direction. At this time, the constraint area 11A of the support film 11 can be pulled towards the small bend side by the second control line 312.

[0091] See Figure 6 As shown, the brachiocephalic artery is denoted as IA, the left common carotid artery as LCCA, and the left subclavian artery as LSA. At this point, the external stent 02 can be implanted into the brachiocephalic artery. The external stent 02 adheres to the brachiocephalic artery, opening it up. The fenestration 111 of the fenestrated stent 01 is aligned with the left common carotid artery and the left subclavian artery. The constraint area 11A of the stent cover 11, along with the fenestration 111 of the fenestrated stent 01, is pulled towards the small bend of the fenestrated stent 01, forming a basin-shaped gap space with the vessel wall, i.e., the temporary sinking space mentioned above.

[0092] Based on the construction of the aforementioned temporary sinking space, blood flow can pass through the fenestration 111 and then flow to the branch arteries of the left common carotid artery and the left subclavian artery. Since the temporary sinking space is much larger than the area of ​​the fenestration 111, even if the position of the fenestration 111 deviates from that of the left common carotid artery and the left subclavian artery, as long as the fenestration 111 is within the range of the temporary sinking space, it will not obstruct blood flow into the branch arteries, thus providing favorable conditions for the subsequent reconstruction of the left common carotid artery and the left subclavian artery.

[0093] In such Figure 6 Based on the state shown, continue to refer to Figure 7 As shown, the surgeon can use the conventional branch channel establishment method to insert the guide wire 04 through the fenestrated opening 111 into the left common carotid artery and left subclavian artery, which are branch arteries. In such cases... Figure 7 Based on the state shown, continue to refer to Figure 8 As shown, the surgeon can retract the delivery device 03, causing the second control line 312 to retract and sequentially disengage from the plurality of second connectors 113 and the constraint coil 3111, while simultaneously causing the first control line 311 to disengage from the first connector 112, thereby releasing the constraint control on the constraint area 11A of the stent cover 11. Figure 8 Based on the state shown, continue to refer to Figure 9 As shown, the surgeon can implant branch stents 05 into the left common carotid artery and the left subclavian artery respectively along the guide wire 04 to complete the implantation of the entire stent and the reconstruction of the blood vessels.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0095] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A window opening bracket, characterized in that, The window opening bracket includes: The support body has deformation capability, and the interior of the support body is provided with an internal space that extends through both ends; The bracket is covered with a membrane, which is disposed on the surface of the bracket body. A constraint area is provided on the surface of the membrane, and at least one window is opened within the constraint area of ​​the bracket. A constraint component configured to constrain the constraint area of ​​the stent cover to deform synchronously with the stent body.

2. The window opening bracket according to claim 1, characterized in that, The constrained area of ​​the stent membrane is movably disposed relative to the stent body, while other areas of the stent membrane outside the constrained area are fixedly connected to the stent body; and / or, The areas outside the constrained region of the stent membrane are configured to deform synchronously with the stent body.

3. The window opening bracket according to claim 2, characterized in that, The constraint component includes: A control element configured to be detachably connected to a constraint region of the support film, thereby constraining the constraint region to deform synchronously with the support body, or allowing the constraint region to deform synchronously with the support body.

4. The window opening bracket according to claim 3, characterized in that, The control element is detachably connected to at least one of the support body and the support membrane; And / or, the stent body and the stent cover are provided with a large bend side and a small bend side, the constraint area is located on the large bend side of the stent cover, and the control element is provided on the small bend side of at least one of the stent body and the stent cover; And / or, the control element is configured as a linear element for threading through the support membrane.

5. The window opening bracket according to claim 3, characterized in that, The constraint component includes: A first connector is disposed on the large bend side of the support membrane, and the control element is configured for detachable connection with the first connector; and / or A second connector is disposed on the small bend side of at least one of the support body and the support cover, and the control element is configured to be detachably connected to the second connector.

6. The window opening bracket according to claim 5, characterized in that, At least one of the first connector and the second connector is configured to connect a coil, and the control element is configured to pass through at least one of the first connector and the second connector; and / or, The control element includes a first control line and a second control line connected together, the first control line being configured to be detachably connected to the first connector, and the second control line being configured to be detachably connected to the second connector.

7. The window opening bracket according to claim 6, characterized in that, The second control line is configured to lock or release the detachable connection between the first control line and the first connector; And / or, the length of the first control line is less than the diameter of the bracket body; And / or, the second control line is provided with a connection point, and the first control line is connected to the connection point of the second control line, wherein the distance from the connection point to the proximal end of the second control line is less than that of the first control line.

8. The window opening bracket according to claim 7, characterized in that, The first control line is provided with a constraint coil, and the second control line is configured to pass through the constraint coil, thereby locking or releasing the detachable connection between the first control line and the first connector; and / or, The length of the first control line is less than the radius of the support body.

9. The window opening bracket according to claim 1, characterized in that, The support body includes several support rings, which are connected sequentially along the axial direction of the support body. Each support ring contains several unit edges, which are connected sequentially along the circumferential direction of the support ring. The unit edges have deformation capability. The window openings of the support film do not radially overlap with any of the support rings of the support body.

10. A support system, characterized in that, The support system includes: Window opening bracket as described in any one of claims 1-9; A conveying device configured to convey the window opening bracket.

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