Windowing support and support system

Abstract

The application provides a fenestrated stent and a stent system. The stent body has a deformation capacity. An internal space is provided in the stent body. A constraint region is provided on the surface of the stent body. At least one fenestration is provided in the constraint region of the stent body. A constraint assembly is configured to constrain at least part of the deformation capacity of at least part of the constraint region of the stent body. The temporary subsidence space can make the fenestration position of the fenestrated stent not completely adhere to the wall, thereby providing sufficient space for branch vessel superselection. Even if the reserved fenestration position of the fenestrated stent cannot completely adhere to the branch opening, the effective establishment of the branch channel and the effective reconstruction of the branch vessel can still be ensured. At the same time, the sufficient blood supply of the supra-arch branch vessel is maintained during the branch vessel superselection and reconstruction. Through the construction of the temporary subsidence space, the safety and effectiveness of the fenestrated stent during implantation can be significantly improved.

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 the ability to deform. The interior of the support body is provided with a space that extends through both ends. The surface of the support body is provided with a constraint area. The constraint area of ​​the support body has at least one window that extends through the space.

[0010] A constraint component configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint region of the support body.

[0011] In one embodiment, the constraint component includes:

[0012] A constraint element is disposed in the constraint region of the support body, and the constraint element is configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint region of the support body.

[0013] In one embodiment, the constraint component includes:

[0014] A control element configured to connect to the constraint element, thereby locking the constraint element on the deformation capability of the constraint region, or releasing the constraint element on the deformation capability of the constraint region.

[0015] In one embodiment, the control element is configured as a linear element, and the constraint element has a constraint hole configured for through which the control element passes.

[0016] In one embodiment, the constraint element is configured as a linear element for linearly winding around at least a portion of the constraint region of the support body, thereby constraining the deformation capability of the constraint region; and / or,

[0017] The constraint element is provided with a constraint coil, and the coil hole of the constraint coil is configured to form the constraint hole.

[0018] In one embodiment, the constraint component includes:

[0019] A control coil is disposed in the constraint area of ​​the support body for passing through the constraint element. The control element is configured to lock or release the connection between the constraint element and the control coil.

[0020] In one embodiment, the constraint area of ​​the support body is provided with connection points, the constraint element is connected to the connection points of the constraint area, and the connection points and the control coil are respectively connected by a first interval distance and a second interval distance. The first interval distance of the connection points is greater than the second interval distance of the control coil.

[0021] In one embodiment, the support body includes a plurality of support rings connected sequentially along the axial direction of the support body, and each support ring includes a plurality of unit edges connected sequentially along the circumferential direction of the support ring. The unit edges have deformability, and the deformability of the support body includes radial deformation of at least a portion of the unit edges of at least a portion of the support rings within the constrained area; and / or,

[0022] The support body is provided with a large bending side and a small bending side, and the constraint area is located on the large bending side of the support body; and / or,

[0023] The support body has a support film on its frame surface.

[0024] In one embodiment, the constraint component is configured to constrain at least a portion of the unit edges of at least a portion of the support ring within the constraint region, thereby constraining the deformation capability of the constraint region.

[0025] This application provides a support system, the support system comprising:

[0026] The window opening bracket;

[0027] A conveying device configured to convey the window opening bracket.

[0028] In the aforementioned window support and support system, the constraint component can constrain the deformation capacity of the support body to a certain extent. This constraint on deformation capacity does not completely deprive the constrained area of ​​the support body of its deformation capacity, but rather limits the deformation capacity of the constrained area of ​​the support body to a certain extent. This ensures that the constrained area of ​​the support body is not completely unable to deform, but rather that when the release area (or unconstrained area) of the support body unfolds, the constrained area of ​​the support body is restricted to unfolding to the same extent. For example, when the release area (or unconstrained area) of the support body is fully unfolded into an expanded state, the constrained area of ​​the support body is restricted to fully unfolding into an expanded state, thereby forming a contracted temporary sinking space in at least a part of the constrained area.

[0029] The aforementioned temporary depression space prevents the fenestrated stent from completely adhering to the wall, providing ample space for branch vessel superselection. Even if the reserved fenestrated opening on the stent cannot perfectly align with the branch opening, effective establishment of the branch channel and effective reconstruction of the branch vessel are still ensured. Simultaneously, adequate blood supply to the supra-arc 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 during implantation. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a window opening bracket provided in one embodiment of this application from a first angle.

[0031] Figure 2 For example Figure 1 The diagram shows the second angle of the window opening bracket.

[0032] Figure 3 For example Figure 1 The diagram shows the first angle of the window opening bracket in use.

[0033] Figure 4 For example Figure 1 The second angle diagram shows the window opening bracket in use.

[0034] Figure 5 For example Figure 1 The diagram shows the unfolded state of the window opening bracket.

[0035] Figure 6 , Figure 7 and Figure 8 This is a schematic diagram of the constraint process of a constraint component provided in one embodiment of this application.

[0036] Figure 9 , Figure 10 , Figure 11 , Figure 12 , Figure 13 This is a step-by-step schematic diagram illustrating the implantation process of a fenestrated stent provided in one embodiment of this application.

[0037] Icon labels:

[0038] 101. Aortic arch; 102. Brachiocephalic trunk; 103. Left common carotid artery; 104. Left subclavian artery; 105. Lesser curvature side; 106. Greater curvature side;

[0039] 111. Guide wire; 112. Branch support;

[0040] 10. Conveying device; 11. Support body; 12. Opening and hollowing; 12A. Temporary sunken space; 13. External branch;

[0041] 21. Constraint element; 22. Control coil; 23. Control element;

[0042] 21A, Fixed end; 21B, Free end;

[0043] 31. Constrained support ring; 31A. Constrained element edge; 31B. Unconstrained element edge; 32. Unconstrained support ring. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] See Figure 1 and Figure 2 As shown, this application provides a window opening bracket, which includes a bracket body 11 and a constraint component. The bracket body 11 has a deformation capability, which allows for corresponding 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 11 can be obtained based on the material or the structural design. Those skilled in the art can choose the type and characteristics of the deformation capability of the bracket body 11 according to actual needs, and no limitation is made here.

[0051] The interior of the support body 11 can be configured with a through-space at both ends. For example, the support body 11 has a proximal end and a distal end, and the through-space can extend through both ends of the support body 11 (i.e., through-space at both ends), thus constructing the support body 11 into a cylindrical structure. It should be noted that the surface of the support body 11 is not a sealed surface, and therefore the through-space of the support body 11 is not a sealed space either. Based on the different structural designs of the support body 11 and the design of the window and hollow 12, the through-space of the support body 11 is actually a space enclosed by the mechanical structure of the support body 11.

[0052] In the support body 11 provided in this application, a constraint area can be provided on the frame surface of the support body 11. This constraint area is a portion of the frame surface of the support body 11. Besides the aforementioned constraint area, other areas on the frame surface of the support body 11 can be referred to as release areas (or non-constraint areas). In one embodiment, the support body 11 may have a large bend side 106 and a small bend side 105, with the constraint area located on the large bend side 106. In this case, at least one window opening 12 penetrating the internal space of the frame can be provided within the constraint area of ​​the support body 11 as needed. The size and shape of the window opening 12 can be designed according to requirements and are not limited here. Furthermore, the frame surface of the support body 11 may be provided with a support film.

[0053] Since the fenestration 12 of the existing fenestrated stent cannot be perfectly aligned during superselection, mainly due to window deviation caused by the physical morphology of the aortic arch 101 and window displacement during the positioning and release of the fenestrated stent, it is generally not possible to solve this problem simply by customizing a precise fenestration 12 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 12 of the fenestrated stent 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 112.

[0054] In response, this application provides a constraint component that can constrain the deformation capacity of the support body 11 to a certain extent. In one embodiment, the constraint component can be configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint area of ​​the support body 11. That is, the entire frame structure of the support body 11 has the deformation capacity mentioned above, which enables the support body 11 to adapt between the contracted state and the expanded state. The constraint effect of the constraint component mainly constrains the deformation capacity of at least a portion of the constraint area of ​​the support body 11.

[0055] Moreover, this constraint on deformation capability does not completely deprive the constrained area of ​​the stent body 11 of its deformation capability, but rather limits it to a certain extent. This ensures that the constrained area of ​​the stent body 11 is not completely unable to deform; rather, when the release area (or unconstrained area) of the stent body 11 unfolds, the constrained area is restricted to unfolding to the same degree. For example, when the release area (or unconstrained area) of the stent body 11 is fully unfolded into an expanded state, the constrained area is restricted to fully unfolding into an expanded state, thereby forming a deformation pattern in at least a portion of the constrained area. Figure 3 and Figure 4 The temporary sunken space 12A shown is relatively contracted in the radial direction.

[0056] The aforementioned temporary sunken space 12A ensures that the fenestrated stent's fenestrated opening 12 does not completely adhere to the wall, providing ample space for branch vessel superselection. Even if the reserved fenestrated opening 12 on the fenestrated stent cannot perfectly 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-arch branches is maintained. The construction of the temporary sunken space 12A significantly improves the safety and effectiveness of the fenestrated stent during implantation.

[0057] The constraint components can constrain the deformation capacity of the support body 11 in various ways, such as by using binding, buckling, clamping, or bonding to apply constraint force to specific areas of the support body 11, thereby constraining the deformation capacity of the support body 11. No limitation is made here.

[0058] In one embodiment, the constraint component includes a constraint element 21 disposed in the constraint area of ​​the support body 11. The constraint element 21 can be fixedly connected or detachably connected, and the connection method can be various methods such as binding, welding, or bonding, which are not limited here. The constraint element 21 disposed in the support body 11 can be configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint area of ​​the support body 11.

[0059] The constraint element 21 can constrain the stent body 11 in at least one of the above-mentioned ways. For example, in one embodiment, the constraint element 21 can be configured as a linear element. The linear element can be a medical thread commonly used in the medical field, used to linearly wrap around at least a portion of the constraint area of ​​the stent body 11, thereby constraining the deformation capability of the constraint area.

[0060] Wherein, after the constraint element 21 is wrapped around the constraint area of ​​the support body 11, the wrapping and binding of the constraint element 21 with the support body 11 should be a loose knot binding, that is, in the first specific state, the constraint on the deformation capacity of the support body 11 is achieved, and in the second specific state, the constraint on the deformation capacity of the support body 11 is released. For example, the way to release the constraint can be that the deformation capacity of the support body 11 acts in the opposite direction to the constraint element 21, breaking free from the constraint of the constraint element 21 and thus releasing the constraint.

[0061] Continue reading Figure 3 and Figure 4 As shown, in one embodiment, the constraint assembly may further include a control element 23, which may have a portion located outside the body after the stent body 11 is implanted, thus allowing for external manipulation of the control element 23. In this case, the control element 23 may be configured to connect to the constraint element 21, allowing external manipulation of the control element 23 to lock or release the constraint of the constraint element 21 on the deformation capacity of the constraint region.

[0062] The control element 23 and the constraint element 21 can be controlled by various methods such as binding, snapping, clamping, and bonding. For example, in one embodiment, the control element 23 can be configured as a linear element, which can be a medical suture commonly used in the medical field, and is not limited here. Furthermore, the constraint element 21 can be provided with constraint holes, which are configured for threading the control element 23 through. The constraint element 21 can be provided with a constraint coil, and the coil hole of the constraint coil is configured to form the constraint hole. Alternatively, holes can be drilled in the constraint element 21 as needed to form the constraint hole, and is not limited here.

[0063] For example, after the constraint element 21 constrains the deformation capacity of the constraint area of ​​the support body 11, the control element 23 can be inserted into the constraint hole of the constraint element 21 and fixed to the support body 11 by the linear design of the control element 23, forming a temporary fixation relative to the support body 11, and simultaneously locking the current constraint state of the constraint element 21. When the user withdraws the control element 23 from outside the body, the control element 23 can be separated from the support body 11 and disengaged from the constraint hole of the constraint element 21, thereby releasing the constraint on the constraint element 21. At this time, the constraint element 21 can be released under the action of the deformation capacity of the support body 11, releasing the constraint on the deformation capacity of the support body 11.

[0064] Continue reading Figure 1 and Figure 3As shown, in one embodiment, the constraint assembly may further include a control coil 22, which is disposed in the constraint area of ​​the support body 11 and is used to pass through the constraint element 21. In this case, the control element 23 can be configured to lock or release the connection between the constraint element 21 and the control coil 22. Therefore, through the mutual cooperation of the control element 23, the control coil 22, and the constraint element 21, the deformation capacity constraint or release of the constraint capacity constraint of the constraint area of ​​the support body 11 can be achieved.

[0065] For example, the constraint element 21 can wrap around a portion of the constraint area of ​​the support body 11 to bind and fix the corresponding area, limiting the deformation capacity of the constraint area. However, the constraint element 21 is not locked at this time. Once the deformation capacity of the support body 11 acts in the opposite direction on the constraint element 21, it can break free from the constraint of the constraint element 21. To this end, the end of the constraint element 21 with the constraint hole can pass through the control coil 22, and the control element 23 can then pass through the constraint hole of the constraint element 21. At this time, based on the cooperation of the control element 23 and the control coil 22, the constraint of the constraint element 21 on the support body 11 can be locked.

[0066] To release the deformation capacity of the stent body 11, simply retract the control element 23. After retraction, the control element 23 will disengage from the constraint hole of the constraint element 21. At this point, the deformation capacity of the stent body 11 can break free from the constraint of the constraint element 21, causing the constraint element 21 to also disengage from the control coil 22, thus completely releasing the constraint of the constraint element 21 on the deformation capacity of the stent body 11. Therefore, the user can flexibly control the state of the stent body 11 during surgery by constraining or releasing the deformation capacity constraint of the constrained area of ​​the stent body 11 through the cooperation of the control element 23, the control coil 22, and the constraint element 21.

[0067] See Figures 5 to 8 As shown, in one embodiment, the constraint area of ​​the support body 11 is provided with connection points. These connection points are actually the places where the constraint element 21 needs to pass through. The constraint element 21 then wraps around from these connection points. These connection points may or may not have any obvious markings or structural design; they are simply a designed location. In this case, the constraint element 21 can be connected to the connection points in the constraint area. The connection points and the control coil 22 are closest to each other at the same window opening 12, with a first interval distance and a second interval distance. The first interval distance is the distance between the connection points and the same window opening 12, and the second interval distance is the distance between the control coil 22 and the same window opening 12.

[0068] See Figure 5 and Figure 6As shown, the first interval distance of the connection points can be designed to be greater than the second interval distance of the control coil 22, thus making the control coil 22 farther from the constraint element 21 relative to the same window cutout 12. For example, see... Figures 6 to 8 As shown, the two ends of the constraint element 21 can be defined as a fixed end 21A and a free end 21B, respectively. The fixed end 21A is used to connect to the support body 11, while the free end 21B is relatively movable and can move freely in the support body 11. At this time, a constraint hole can be provided at the free end 21B of the constraint element 21.

[0069] Continue reading Figure 7 As shown, the free end 21B of the constraint element 21 can pass through the support body 11 in a specific direction, and then... Figure 8 The constraint element 21 wraps around in the indicated direction, securing a portion of the support body 11, thereby constraining that portion. For example, the free end 21B of the constraint element 21 can pass through the support body 11 in a direction away from the control coil 22, and then... Figure 8 The coil is wound in the direction of the control coil 22. Therefore, the purpose of defining the first and second intervals is to facilitate the winding and engagement between the constraint element 21 and the control coil 22.

[0070] When the free end 21B of the constraint element 21 passes through the support body 11 in a specific direction, and then... Figure 8 After the direction shown is reversed, the corresponding position of the support body 11 will contract towards the center, causing both the large and small bends of the support body 11 to have sinking spaces, but the sinking space of the large bend side of the support body 11 is greater than the sinking space of the small bend side. Furthermore, the constraint element 21, as... Figure 8 After the constraint element 21 is wound back in the indicated direction, the free end 21B of the constraint element 21 passes through the control coil 22, and the control element 23 can then pass through the free end 21B of the constraint element 21.

[0071] Regarding the structural design of the aforementioned support body 11, in one embodiment, the support body 11 may include several support rings in the axial direction, such that the several support rings can be sequentially connected along the axial direction of the support body 11 to form the support body 11. Moreover, each support ring constituting the support body 11 may include several unit edges in the circumferential direction, and the several unit edges are sequentially connected along the circumferential direction of the support ring. 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 11 includes the radial deformation of at least a portion of the unit edges of at least a portion of the support rings within the constrained area, provided by the deformation capability of the unit edges.

[0072] Therefore, please continue reading Figures 5 to 8As shown, in one embodiment, the constraint component can be configured to constrain at least a portion of the element edges of at least a portion of the support ring within the constrained region, thereby constraining the deformation capability of the constrained region. See, for example, [reference needed]. Figure 7 As shown, the free end 21B of the constraint element 21 can pass through several unit edges of the support body 11 in a direction away from the control coil 22, and then... Figure 8 The coil is wound around the control coil 22, and then wound between several unit edges, so that the adjacent unit edges deform and move closer to each other, thereby constraining the deformation capability of the unit edges.

[0073] Therefore, the constraint of the constraint component on the deformation capability of the constraint area of ​​the support body 11 is actually a local beam diameter effect. If a part of the support ring in the constraint area of ​​the support body 11 is called the constrained support ring 31, and the rest of the support ring in the release area (or non-constrained area) of the support body 11 is called the non-constrained support ring 32, then the local beam diameter effect is mainly that after the window support is released at the expected position, the non-constrained support ring 32 is fully unfolded, while the constrained support ring 31 can produce a local beam diameter effect under the constraint of the constraint component, so that its diameter is constrained and not fully unfolded.

[0074] Meanwhile, if a portion of the unit edges of the constrained area of ​​the support body 11 is called constrained unit edges 31A, and the remaining unit edges of the release area (or non-constrained area) of the support body 11 are called non-constrained unit edges 31B, then even if some constrained support rings 31 are within the constrained area in the axial direction, the unit edges outside the constrained area in these constrained support rings 31 are not constrained. That is, the above-mentioned local beam diameter effect does not act uniformly on all unit edges of the constrained support rings 31, but only on the constrained unit edges 31A around the window opening 12 position on the large bend side 106, and not on the non-constrained unit edges 31B on the small bend side 105.

[0075] Therefore, the above-mentioned constraints allow the greater curvature side 106 of the constrained area of ​​the fenestrated stent to present a temporary downward space 12A, and the constrained area does not adhere to the branch vessels of the aortic arch, thereby generating sufficient branch overselection space, significantly improving the fault tolerance of fenestrated alignment, and effectively avoiding the occurrence of unintended coverage of the aortic arch branches after the fenestrated stent is released.

[0076] This application provides a support system, which may include the aforementioned window opening support and a conveying device 10, which can be configured to convey the window opening support. Since the specific structure, functional principle, and technical effects of the aforementioned window opening support have been described in detail above, they will not be repeated here. Any technical details regarding the aforementioned window opening support can be found in the foregoing description.

[0077] See Figure 9 As shown, in one embodiment, the aforementioned fenestration bracket can be configured with one to four fenestration openings 12 according to the patient's lesion extent and clinical treatment plan, and can also be configured with one or more external branches 13 as needed. Based on the number of fenestration openings 12 and the position of the external branches 13, the fenestration bracket can be combined and configured into multiple configurations. For a clearer illustration of the technical solution of this application, please refer to... Figure 9 As shown, taking the configuration of one outer branch 13 and two window openings 12 as an example, the specific implementation of this application is further illustrated.

[0078] First, refer to Figure 9 As shown, the stent system can be guided along the pre-defined guidewire channel to the intended location in the aortic arch 101. At this time, the external branch 13 on the fenestrated stent is introduced into the brachiocephalic trunk 102, and the two fenestrated openings 12 on the fenestrated stent are located around the openings of the left common carotid artery 103 and the left subclavian artery 104. (See reference...) Figure 10 As shown, the constraint component is released from the stent body 11. At this time, the release area (or unconstrained area) of the stent body 11 has been fully unfolded and attached to the aortic vessel, while the constrained area of ​​the stent body 11 is constrained by the constraint component. This causes the unconstrained unit ridge 31B near the small curve side 105 of the arch to be fully unfolded, while the constrained unit ridge 31A near the large curve side 106 of the arch is still in a compressed state after constraint. This forms a temporary sinking space 12A on the large curve side 106 of the fenestrated stent, and the temporary sinking space 12A covers the openings of the left common carotid artery 103 and the left subclavian artery 104.

[0079] See Figure 11 As shown, two sets of guidewires 111, in conjunction with a guide tube, can be sequentially passed through the lower limb approach, through the space within the fenestrated stent and the fenestrated opening 12, into the gap between the temporary sinking space 12A of the fenestrated stent and the aortic arch 101. At this point, it is easier to use endovascular techniques to selectively access the branch vessels of the aortic arch and establish guidewire access to the branch stents 112 of the left common carotid artery 103 and the left subclavian artery 104.

[0080] See Figure 12 As shown, after superselection, the control element 23 can be retracted to release the local bundle diameter effect of the fenestrated stent, allowing the constrained area of ​​the fenestrated stent to fully expand, and the fenestrated opening 12 on the fenestrated stent to completely align with the greater curvature side 106 of the aortic arch 101. At this point, even if the fenestrated stent is perfectly anatomically customized and its positioning and release are relatively precise, the fenestrated opening 12 may still not completely overlap with the external opening of the branch vessel. However, since the guidewire pathway of the branch stent 112 has already been established, even if there is a misalignment of the fenestrated opening 12, it will not affect the subsequent reconstruction process of the branch stent 112.

[0081] See Figure 13 As shown, the branch stent 112 is sequentially introduced and released at the expected location through the guidewire pathway of the branch stent 112. At this time, since the branch guidewire pathway has been effectively established, even if there is a misalignment between the fenestration 12 and the branch, it will not affect the introduction of the branch stent 112 system. By pre-dilation with a balloon or dilation after the branch stent 112 is released, the relative position of the fenestration 12 and the branch opening can be effectively corrected, achieving a good endovascular aortic repair and aortic branch reconstruction effect.

[0082] 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.

[0083] The embodiments described above are merely illustrative of 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 the ability to deform. The interior of the support body is provided with a space that extends through both ends. The surface of the support body is provided with a constraint area. The constraint area of ​​the support body has at least one window that extends through the space. A constraint component configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint region of the support body.

2. The window opening bracket according to claim 1, characterized in that, The constraint component includes: A constraint element is disposed in the constraint region of the support body, and the constraint element is configured to constrain at least a portion of the deformation capacity of at least a portion of the constraint region of the support body.

3. The window opening bracket according to claim 2, characterized in that, The constraint component includes: A control element configured to connect to the constraint element, thereby locking the constraint element on the deformation capability of the constraint region, or releasing the constraint element on the deformation capability of the constraint region.

4. The window opening bracket according to claim 3, characterized in that, The control element is configured as a linear element, and the constraint element is provided with a constraint hole, which is configured to allow the control element to pass through.

5. The window opening bracket according to claim 4, characterized in that, The constraint element is configured as a linear element for linearly winding around at least a portion of the constraint region of the support body, thereby constraining the deformation capability of the constraint region. And / or, The constraint element is provided with a constraint coil, and the coil hole of the constraint coil is configured to form the constraint hole.

6. The window opening bracket according to claim 3, characterized in that, The constraint component includes: A control coil is disposed in the constraint area of ​​the support body for passing through the constraint element. The control element is configured to lock or release the connection between the constraint element and the control coil.

7. The window opening bracket according to claim 6, characterized in that, The constraint area of ​​the main body of the bracket is provided with connection points. The constraint element is connected to the connection points of the constraint area. The connection points and the control coil are respectively connected by a first interval distance and a second interval distance. The first interval distance of the connection points is greater than the second interval distance of the control coil.

8. The window opening bracket according to claim 1, characterized in that, 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. Each unit edge has a deformation capability. The deformation capability of the support body includes the radial deformation of at least a portion of the unit edges of at least a portion of the support rings within the constrained area. And / or, The support body is provided with a large bending side and a small bending side, and the constraint area is located on the large bending side of the support body; and / or, The support body has a support film on its frame surface.

9. The window opening bracket according to claim 8, characterized in that, The constraint component is configured to constrain at least a portion of the unit edges of at least a portion of the support ring within the constraint region, thereby constraining the deformation capability of the constraint region.

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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