support system

Abstract

This invention relates to a stent system, comprising a covered stent and a delivery device. The covered stent includes a main stent, which includes a main corrugated coil and a main covering, the main covering covering the main corrugated coil. The delivery device includes a semi-binding structure, which includes a membrane. The membrane releasably binds the main stent to allow radial compression or release of the main stent. The membrane includes a slit located proximally to the main stent. During release of the main stent, the slit forms a non-closed opening at the proximal end of the main stent, facilitating easy removal of the membrane from the main stent. The slit's location at the proximal end of the main stent allows the distal end of the membrane to be stretched open by the natural expansion of the main stent, making it easier to pull out and remove the membrane from the main stent.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and in particular to a stent system. Background Technology

[0002] Aortic aneurysms and aortic dissections are serious diseases that threaten human life. Without prompt treatment, these aneurysms and dissections will continue to grow, eventually rupturing and causing severe complications and death. With the increasing number of patients with hypertension, hyperlipidemia, and hyperglycemia, the incidence of aortic aneurysms and aortic dissections is also rising significantly. Traditional open surgery for aortic aneurysms and aortic dissections is highly invasive, has a high mortality rate, long operation time, high postoperative complication rate, and high surgical difficulty. Endovascular treatment, on the other hand, is less invasive, has fewer postoperative complications, shorter operation time, and lower surgical difficulty, and has gradually become the main method for treating aortic aneurysms and aortic dissections. By implanting a covered stent in the aorta, the vascular lesion is isolated outside the covered stent, restricting blood flow through the stent and thus protecting the blood vessel.

[0003] For aortic aneurysms or arterial dissections involving branches such as the aortic arch, celiac trunk, bilateral renal arteries, or superior mesenteric artery, the use of covered stents can impair blood supply to the branch vessels. To address this, appropriate perforations are created in the covered stent to allow blood flow to the branch vessels. Typically, the diameter of the perforation is close to that of the branch vessel. Ensuring that the perforation precisely aligns with the branch vessel and that the guidewire is properly inserted into the branch vessel are crucial for branch reconstruction.

[0004] To ensure the stent orifice aligns perfectly with the branch vessel, a common method is to use a semi-binding structure formed by a guidewire and sutures to circumferentially constrain the stent, causing radial compression. After release from the delivery sheath, the stent remains in this radially compressed state, facilitating intraoperative positioning and allowing for precise placement before full release. However, this semi-binding method typically involves fixing the sutures or other bundle structures to the stent, preventing it from being carried out of the body by the delivery device after full release, thus increasing the risk of foreign bodies. Furthermore, in stent systems where a guidewire is pre-placed and then inserted into the branch vessel, the guidewire's flexibility and lack of directionality make it difficult to directly insert the radially compressed stent into the branch vessel orifice. A capture device is needed to select the guidewire from the other end of the branch vessel, requiring the surgeon to puncture or incise the vessel preoperatively, increasing patient trauma. Additionally, the guidewire can easily become entangled with the main stent's rigid guidewire during capture, increasing surgical time and difficulty. Summary of the Invention

[0005] At least one technical problem solved by the present invention is how to set the membrane of the semi-binding structure of the stent system so as to facilitate the removal of the membrane and thereby reduce foreign matter.

[0006] This invention provides a stent system comprising a coated stent and a conveying device. The coated stent includes a main stent, a main corrugated coil, and a main coating, the main coating covering the main corrugated coil. The conveying device includes a semi-binding structure, the semi-binding structure including a membrane, the membrane releasably binding the main stent to allow the main stent to be radially compressed or released. The membrane includes a slit, the slit being correspondingly located on the proximal end side of the main stent. During the release of the main stent, the slit forms a non-closed opening at the proximal end of the main stent, facilitating the removal of the membrane from the main stent.

[0007] In one embodiment, the covered support further includes a branch support disposed on one side of the main support. The delivery device includes a sheath core assembly, a support rod, and a sheath tube, which are sequentially sleeved from the inside to the outside. The sheath tube is axially movable relative to the sheath core assembly. The distal end of the slit begins from the distal end of the film, and the proximal end of the slit passes over the branch support. The proximal end of the film is circumferentially connected to the distal end of the support rod, which is axially movable relative to the sheath core assembly.

[0008] In one embodiment, two rows of perforations are provided along both sides of the cut, and the semi-binding structure further includes a detachable member, the distal end of which is sequentially sewn or passed through the perforations.

[0009] In one embodiment, the covered stent further includes a branch stent disposed on one side of the main stent, and the delivery device further includes a pre-placed conduit, the distal end of which enters from the distal end of the main stent and exits from the branch stent.

[0010] In one embodiment, the pre-installed conduit is configured as an adjustable bend conduit, which includes an adjustable bend and an adjusting member. The adjustable bend includes an extension section and an adjustable bend section, the adjustable bend section being disposed at the distal end of the extension section. The adjustable bend conduit also includes a limiting hole, which is disposed at the proximal end of the adjustable bend section. The adjusting member includes a distal end and an adjusting section, the distal end of the adjusting member being connected to the distal end of the adjustable bend. The adjusting member passes through the limiting hole and extends towards the proximal end, thereby forming the adjusting section between the limiting hole and the distal end.

[0011] In one embodiment, the semi-binding structure further includes a diameter-detachable member that cooperates with the membrane to achieve radial constriction and release of the covered stent, the diameter-detachable member passing through the gap between the adjustment section and the adjustable bend section.

[0012] In one embodiment, the covered support further includes a branch support disposed on one side of the main support. The delivery device includes a sheath core assembly, a support rod, and a sheath tube. The sheath core assembly includes an inner sheath core and an outer sheath core. The inner sheath core, outer sheath core, support rod, and sheath tube are sequentially sleeved from the inside to the outside, and each pair of the inner sheath core, outer sheath core, and sheath tube can move relative to each other along the axial direction. The covered support further includes a first bare wave coil. The support system includes a rear release structure. The distal end of the outer sheath core and the proximal end of the guide head form a rear release structure. The rear release structure is used to hook the first bare wave coil, thereby realizing the rear release of the first bare wave coil.

[0013] In one embodiment, the membrane includes a naturally unfolded state and a folded wrapped state. In the folded wrapped state, the membrane includes a first wrapping layer, a first fold, a second wrapping layer, a second fold, a third wrapping layer, and a circumferential connection. The membrane forms a first wrapping layer from the first fold towards the proximal end, and the covered stent is wrapped within the first wrapping layer. The membrane is folded outward from the distal end towards the proximal end in the naturally unfolded state along the first fold, thereby forming a second wrapping layer on the outside of the first wrapping layer. Based on this, the membrane continues to be folded outward towards the distal end along the second fold, thereby forming the third wrapping layer on the outside of the second wrapping layer. The slit extends from the first fold towards the proximal end beyond the branch stent.

[0014] In one embodiment, the axial length of the membrane in its naturally unfolded state is defined as L1, and the axial length of the main body covering is defined as L2. Then L1 and L2 satisfy: L1 > 2L2.

[0015] In one embodiment, the axial length from the first fold to the proximal end of the membrane is defined as L3, wherein L3 and L2 satisfy the condition: L3 > L2.

[0016] In one embodiment, the covered stent includes a first connection point, which is the connection point located at the farthest end of the main stent when the branch stent and the main stent are circumferentially connected. The axial length from the first connection point to the proximal end face of the main covered stent is defined as L5, and L4 and L5 satisfy: L4≥2L5.

[0017] One technical effect of an embodiment of the present invention is that the membrane includes a slit, which is located at the proximal end of the main support. Due to the slit, the distal end of the membrane is stretched open by the natural expansion of the main support, making it easier to pull the membrane out and remove it from the main support. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the film-coated stent in one embodiment of the present invention;

[0019] Figure 2 for Figure 1 A partial structural diagram from another perspective;

[0020] Figure 3 This is a schematic diagram of the support system in one embodiment of the present invention;

[0021] Figure 4 A schematic diagram of the support rod provided in one embodiment of the present invention from an axial perspective.

[0022] Figure 5 This is a partial structural diagram of the support system provided in one embodiment of the present invention (sheath omitted);

[0023] Figure 6 This is a schematic diagram of the structure of the coating in one embodiment of the present invention;

[0024] Figure 7 for Figure 6 Enlarged view of point A in the middle;

[0025] Figure 8 A schematic diagram of the structure in another embodiment of the present invention, in which the membrane is in a naturally unfolded state (to better show the position of the stent wrapped in the membrane, a schematic diagram of the covered stent without radial compression is shown at the corresponding lateral position outside the membrane for position reference).

[0026] Figure 9 A schematic diagram of a structure in which the membrane is folded and wrapped in another embodiment of the present invention (in order to better show the position of the stent wrapped in the membrane, a schematic diagram of the covered stent when the stent is not radially compressed is shown at the corresponding lateral position outside the membrane for position reference).

[0027] Figure 10 A schematic diagram of a structure in another embodiment of the present invention, wherein the film is in a fully enclosed state (to better show the position of the stent wrapped inside the film, a schematic diagram of the covered stent without radial compression is shown at the corresponding lateral position outside the film for position reference).

[0028] Figure 11A schematic diagram of a structure in another embodiment of the present invention, wherein the membrane is in a semi-enclosed intermediate state (overlapping cuts) (to better show the position of the stent wrapped inside the membrane, a schematic diagram of the covered stent without radial compression is shown at the corresponding lateral position outside the membrane for position reference).

[0029] Figure 11a for Figure 10 Enlarged view of point B in the middle;

[0030] Figure 12 This is a partial structural diagram of the guide head and inner sheath core provided in one embodiment of the present invention;

[0031] Figure 13 This is a schematic diagram of the card component in the rear release structure provided by one embodiment of the present invention;

[0032] Figure 14 A diagram showing the closable state formed by the locking mechanism and slot of the rear-release structure provided in one embodiment of the present invention;

[0033] Figure 15 This is a partial structural diagram of an adjustable bendable conduit in one embodiment of the present invention.

[0034] Figure 16 for Figure 15 Mid-radial section view;

[0035] Figure 17 A partial structural schematic diagram of the adjustable conduit (unadjusted state) in another embodiment provided in this application;

[0036] Figure 18 A partial structural schematic diagram of the adjustable conduit (adjusted state) in another embodiment provided for this application;

[0037] Figure 19 for Figure 18 Enlarged view at point D;

[0038] Figure 20 for Figure 19 Enlarged view at point E in the middle;

[0039] Figure 21 for Figure 17 Cross-sectional view at the middle extension section;

[0040] Figure 22 A schematic diagram of another embodiment of the limiting hole portion provided by the present invention;

[0041] Figure 23 for Figure 6 The diagram provided shows the structure of the adjustable bendable conduit and the detachable bundle diameter component when the membrane is set with a detachable bundle diameter component.

[0042] Figure 24 for Figure 23 Enlarged view of the middle branch support section;

[0043] Figure 25 A schematic diagram showing how, when a stent system provided in this application is used in the aortic arch, the stent system is advanced to the aortic arch via a guidewire, and then the sheath is withdrawn to the distal end of the covered stent so that the capsule is fully encapsulated.

[0044] Figure 26 In order to be in Figure 25 A schematic diagram showing the process of pushing the adjustable catheter forward to expose it through the capsule and then adjusting it to select a branch vessel.

[0045] Figure 27 In order to be in Figure 26 A schematic diagram of removing the adjustable bend conduit based on the above.

[0046] Figure 28 In order to be in Figure 27 The diagram shows the process of further retracting the sheath to completely release the covered stent from the membrane (the first bare wave loop is hooked onto the release structure). Detailed Implementation

[0047] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0048] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "inner," "outer," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0049] "Axial direction" generally refers to the length of a medical device during delivery, while "radial direction" generally refers to the direction perpendicular to the medical device's "axial direction." Based on this principle, the "axial" and "radial" directions of any component of a medical device are defined. Furthermore, when describing luminal stents or covered stents, the orientation can be defined according to the direction of blood flow in the blood vessel. In this invention, blood flow is defined as flowing from the proximal end to the distal end of the stent. In the field of interventional medical devices, for delivery devices used to implant medical devices into humans or animals, the end closer to the operator is generally defined as the "proximal end," and the end farther from the operator is defined as the "distal end." Based on this principle, the "proximal end" and "distal end" of any component of the delivery device are defined.

[0050] The "wave loop" in this application is a closed ring structure, also known as a wave-shaped ring, made of woven or cut metallic elastic material. This metallic elastic material includes known materials used in implantable medical devices or combinations of various biocompatible materials, such as alloys of two or more single metals selected from cobalt, chromium, nickel, titanium, magnesium, and iron, as well as 316L stainless steel, nickel-titanium-tantalum alloys, or other biocompatible metallic elastic materials. The wave loop has radial expansion capability, allowing it to radially contract under external force and recover its initial shape after the external force is removed, thus maintaining its initial shape. After implantation into a lumen, its radial support force allows it to adhere tightly to the inner wall of the lumen. The waveform of the wave loop is unrestricted, including Z-shaped waves, M-shaped waves, V-shaped waves, sine waves, etc. The wave loop includes multiple peaks (also known as proximal apexes), multiple troughs (also known as distal apexes), and wave rods connecting adjacent peaks and troughs. A single peak (proximal or distal) and the two wave rods connected to that peak form a single wave.

[0051] This invention provides a support system 700, such as Figure 1-24 As shown, the stent system 700 includes a film-coated stent 100 and a conveying device 70, wherein, as Figure 1-2 As shown, the covered support 100 includes a main support 10, a first bare wave coil 20, and a branch support 30. The main support 10 includes a main wave coil 11 and a main cover 12, with the main cover 12 covering the main wave coil 11. The main wave coil 11 is a ring structure formed by connecting multiple waveform units end to end. Here, a waveform unit refers to a single-wave structure composed of wave crests, wave rods, and wave troughs, and the shape of the waveform unit is not limited. Each main wave coil 11 can be a regular ring structure formed by multiple waveform units of equal height, or it can be an irregular ring structure including high and low waves formed by waveform units of different wave heights. Adjacent main wave coils 11 can all be regular ring structures, or they can all be irregular ring structures including high and low waves, or they can be a combination of two types of ring structures: regular ring structures and irregular ring structures including high and low waves. This is not limited here.

[0052] The main body covering 12 is a tubular structure with openings at both ends. Multiple main body wave coils 11 are arranged axially and connected through the tubular main body covering 12 to form a tubular main body support 10. The distal end of the first bare wave coil 20 is connected to the proximal end of the main body support 10, thereby exposing the first bare wave coil 20 to the outside of the main body covering 12.

[0053] The branch stent 30 is connected to one axial side of the main stent 10, and the lumen of the branch stent 30 is connected to the lumen of the main stent 10. In this embodiment, the covered stent 100 can be used to implant into a curved blood vessel. When the covered stent 100 is implanted in a curved blood vessel, the first side 10a of the main stent 10 is defined as the side that conforms to the greater curvature of the blood vessel, and the second side 10b of the main stent 10 is defined as the side that conforms to the lesser curvature of the blood vessel. Taking the curved shape of the main stent 10 implanted in the aortic arch as an example, the first side 10a and the second side 10b of the main stent 10 are further explained, wherein the first side 10a is the side of the main stent 10 closer to the branch of the aortic arch (greater curvature side), and the second side 10b is the side of the main stent 10 away from the branch of the aortic arch (lesser curvature side).

[0054] The branch bracket 30 is connected to the first side 10a of the main bracket 10. The branch bracket 30 can be located at the middle of the arc of the first side 10a. The main bracket 10 also includes multiple connectors (not shown). The connectors connect two adjacent main corrugated coils 11. The connectors are located on the first side 10a of the main bracket 10. The connector can be formed by one end of a main corrugated coil 11 extending to an adjacent main corrugated coil 11, or multiple separate connectors can connect two adjacent main corrugated coils 11 together axially. The connectors are continuously arranged axially at the circumferential center of the first side 10a. The branch bracket 30 is located on the circumferential central axis of the first side 10a. Some connectors are located on the same axial line as the branch bracket 30, so that the coating bracket 100 can be easily bent toward the second side 10b, but not easily bent toward the first side 10a. The connectors near the branch bracket 30 can be located on both sides of the branch bracket 30 axially to avoid the position of the branch bracket 30.

[0055] like Figure 1-2 As shown, the main support 10 includes an annular support 13 and a window 14. The window 14 is disposed on one side of the main support 10 and is used to communicate with the branch support 30. The annular support 13 is disposed along the window 14 and is made of developing material. It is used to support the edge of the window 14 and to show the position of the branch support 30.

[0056] The branch bracket 30 includes a first end 31, a middle section 32, and a second end 33. The first end 31 and the second end 33 are two opposite ends. The middle section 32 is located between the first end 31 and the second end 33. The first end 31 of the branch bracket 30 can be directly connected circumferentially to the window 14 of the main bracket 10, thereby connecting the branch bracket 30 to one side of the main bracket 10. Figure 1 As shown. In other embodiments, the covered stent 100 further includes an annular connecting membrane that connects the middle section 32 of the main stent 10 and the branch stent 30, thereby connecting the branch stent 30 to the main stent 10, such that the first end 31 of the branch stent 30 is located inside the lumen of the main stent 10, and the second end 33 of the branch stent 30 is located outside the lumen of the main stent 10.

[0057] The outer diameter of the branch stent 30 is smaller than the inner diameter of the annular support 13, and the radial width of the annular connecting membrane is greater than the difference between the inner diameter of the annular support 13 and the outer diameter of the branch stent 30. This allows the annular connecting membrane to allow the branch stent 30 to float vertically (radially in the main stent 10). At the same time, the branch stent 30 can swing 360° circumferentially along its tubular shape. This makes the orientation of the opening of the second end 33 of the branch stent 30 away from the main stent 10 adjustable. After the covered stent 100 is implanted into the blood vessel, when a guidewire is used to approach the branch vessel, the opening of the second end 33 of the branch stent 30 is more easily aligned with the branch vessel opening, thus reducing the impact of the complexity of the anatomical morphology on the correspondence between the opening of the second end 33 of the branch stent 30 and the branch vessel opening. The annular connecting membrane connects the middle part of the branch support 30, so that part of the branch support 30 is located outside the main support 10 and part is located inside the main support 10. This ensures that the second end 33 of the branch support 30 floats down to be flush with the main support 10. Within the range of the annular support 13, the orientation of the opening of the second end 33 of the branch support 30 is adjustable, making it easier to adapt to different anatomical shapes.

[0058] Combination Figure 3-5 As shown, the delivery device 70 includes a sheath core assembly 71, a support rod 72, a sheath tube 73, a semi-binding structure, a handle assembly 75, and a pre-placed catheter. The sheath core assembly 71 includes an inner sheath core 711 and an outer sheath core 712. The inner sheath core 711, the outer sheath core 712, the support rod 72, and the sheath tube 73 are sequentially sleeved from the inside to the outside, and the inner sheath core 711, the outer sheath core 712, and the sheath tube 73 can move relative to each other in the axial direction. The support rod 72 is sleeved on the outside of the sheath core assembly 71.

[0059] The conveying device 70 also includes a guide head 76, which is disposed at the distal end of the inner sheath core 711. A space is provided between the distal end of the support rod 72 and the proximal end of the guide head 76 to form a loading space for the film-coated support 100. Figure 3 Combination Figure 5As shown. The semi-binding structure includes a membrane 79, which is used to releasably bind the covered stent 100 so that the covered stent 100 is radially compressed or released. The membrane 79 is connected to the distal end of the sheath 73 or the support rod 72, thereby facilitating the removal of the membrane 79 from the main stent 10 for removal from the patient's body. Further, in other embodiments, the semi-binding structure may also include a detachable diameter member 74. The membrane 79 and the detachable diameter member 74 cooperate to form the semi-binding structure, and the membrane 79 achieves radial contraction and release of the main stent 10 through cooperation with the detachable diameter member 74.

[0060] A developing element 731 is provided at the distal end of the sheath 73. The developing element 731 may be configured as a developing ring to indicate the position of the distal end of the sheath 73.

[0061] The delivery device 70 also includes a membrane 79, which is connected to the distal end of the delivery device 70. The membrane 79 is a tubular membrane used to radially constrict the main support 10. When a pre-placed conduit is provided, the relationship between the circumference W of the membrane 79 and the lumen circumference C of the covered support 100 at the corresponding position satisfies: W ≤ C / 4. This ensures that the compression radius of the covered support 100 in a semi-bound state is small, i.e., the radial compression degree of the covered support 100 is maintained at a relatively large level. On the one hand, this ensures that the channel size is slightly larger than the outer diameter of the pre-placed conduit, thus ensuring smooth delivery of the pre-placed conduit. Even if the radially compressed corrugated coils of the covered support 100 are crowded, the pre-placed conduit, pre-placed within the covered support 100, provides radial soft buffering due to the soft wrapping of the membrane 79, reducing the friction between the pre-placed conduit and the stacked main corrugated coils 11. When axial delivery is required, the pre-placed conduit can provide radial soft buffering. This ensures smooth delivery; on the other hand, it ensures that the channel size is not too large, limiting the radial space of the pre-placed catheter and preventing the pre-placed catheter from bending in the channel during delivery; in addition, the radial compression of the covered stent 100 by the sheath 79 on the covered stent 100 results in less friction on the pre-placed catheter compared to the compression of the covered stent 100 by the sheath 73. Furthermore, since the wrapping of the main stent 10 by the sheath 79 is uniform in the axial direction of the main stent 10, it also avoids the situation where, when the covered stent 100 is bundled with a wire, some unbound areas are lifted by the self-expansion force of the main corrugated coil 11, resulting in a larger channel and the pre-placed catheter bending in areas with larger channel space.

[0062] Understandably, in order to increase the radial compression of the membrane 79, the relationship between the circumference W of the membrane 79 and the lumen circumference C of the covered stent 100 at the corresponding position can be set to satisfy: W≤C / 5. Even if the channel space of the covered stent 100 after radial compression is small after the membrane 79 wraps the covered stent 100, since the membrane 79 is a flexible membrane, its radial compression of the covered stent 100 is a soft wrapping. When the pre-placed catheter is pre-placed in this space along the axial direction, the pre-placed catheter can also slide smoothly along the axial direction in the narrow space. At the same time, the membrane 79 radially squeezes the covered stent 100, which can prevent the pre-placed catheter from bending in the channel space.

[0063] like Figure 6-7 as well as Figure 8-11 As shown, the capsule 79 includes a short slit 791, which is located on the proximal side of the main stent 10. The slit 791 can extend axially or deviate from the axial direction. The proximal end of the slit 791 extends beyond the branch stent 30, allowing the branch stent 30 to be exposed from the slit 791. Combined with the post-release structure formed by the proximal end of the first bare wave coil 20 hooking onto the sheath core assembly 71, the first main wave coil 11 and the first bare wave coil 20 are still radially compressed to a certain extent. Similarly, before the stent system 700 is released, the release position of the main stent 10 or the position of the branch stent 30 corresponding to the branch vessel can be finely adjusted. At the same time, after the stent system 700 is accurately aligned, it is easy to pull the proximal end 79a of the capsule 79 to remove the capsule 79 from the main stent 10.

[0064] In one implementation, such as Figure 6-7 As shown, the distal end of the slit 791 starts from the distal end 79b of the membrane 79. That is, during the release of the main support 10, the slit 791 forms a non-closed opening at the proximal end of the main support 10. The proximal end 79a of the membrane 79 is circumferentially connected to the distal end of the support rod 72. The support rod 72 can move axially relative to the sheath core assembly 71 so that after the support system 700 has constructed the branch channel and positioned the covered support 100 to be released, the distal end 79b of the membrane 79 is opened by the natural expansion of the main support 10 due to the setting of the slit 791. Retracting the support rod 72 can more easily pull out the membrane 79, thereby releasing the main support 10 from the membrane 79.

[0065] Furthermore, a removable bundle diameter member 74 can be provided at the slit 791 of the capsule 79. When the removable bundle diameter member 74 is provided, two rows of perforations 798 are provided along both sides of the slit 791. The distal end of the removable bundle diameter member 74 is sequentially sutured or passed through the perforations 798 along the edge of the slit 791 of the capsule 79, so that after the sheath 73 is withdrawn and before the capsule 79 is removed, the distal end 79b of the capsule 79 cooperates with the removable bundle diameter member 74 to radially compress the proximal end of the main support 10, thereby maintaining a good semi-binding state for the main support 10 as a whole. It can also better remove the capsule 79 after the removable bundle diameter member 74 is withdrawn to release the main support 10, and at the same time bring the capsule 79 out of the patient's body to reduce foreign bodies. In one embodiment, the removable diameter member 74 may include a diameter guide wire 741, which passes sequentially through perforations 798 along the edge of the slit 791 of the membrane 79, so that when the diameter guide wire 741 is retracted, the proximal end of the membrane 79 can be widened, thereby facilitating the delivery device 70 to remove the membrane 79 from the covering support 100. The proximal end of the removable diameter member 74 is connected to a safety buckle 743, which is detachably fixed to the handle assembly 75 to prevent the proximal end of the covering support 100 from being accidentally placed.

[0066] like Figure 4 As shown, the support rod 72 includes a first channel 721 and a second channel 722 extending axially. The first channel 721 allows the sheath core assembly 71 to pass through axially, and the second channel 722 allows the pre-placed catheter to pass through. In one embodiment, when a detachable guide wire 74 is provided, the support rod 72 may further include a third channel 723, through which the guide wire 741 or a detachable suture passes axially.

[0067] In other embodiments, the detachable member may not be provided; the membrane 79 may be used alone to partially bind the main support 10 and to facilitate the removal of the membrane 79 during removal. For example... Figure 8-11As shown, the membrane 79 includes a naturally unfolded state and a folded wrapping state. Before being assembled into the support system 700, the membrane 79 is in the naturally unfolded state. At this time, the membrane 79 is a tubular membrane. The membrane 79 includes a slit 791, a proximal end 79a and a distal end 79b. The axial length L1 of the membrane 79 in the naturally unfolded state is greater than the axial length L2 of the main body covering 12, and L1 and L2 satisfy: L1 > 2L2. When the covered stent 100 is loaded into the cover 79 to form the stent system 700, the cover 79 is in a folded and wrapped state. In the folded and wrapped state, the cover 79 includes a first wrapping layer 792, a first fold 793, a second wrapping layer 794, a second fold 795, a third wrapping layer 796, and a circumferential connection 797. The first wrapping layer 792 is formed from the portion of the cover 79 from the first fold 793 toward the proximal end 79a. The covered stent 100 is wrapped in the first wrapping layer 792. The cover 79 is folded outward from the distal end toward the proximal end in its naturally unfolded state along the first fold 793, thereby forming a second wrapping layer 794 on the outside of the first wrapping layer 792. Based on this, the cover 79 continues to be folded outward toward the distal end along the second fold 795, thereby forming a third wrapping layer 796 on the outside of the second wrapping layer 794. The slit 791 extends proximally from the first fold 793 to past the branch support 30. The axial length from the first fold 793 to the proximity of the membrane 79 is defined as L3, where L3 > L2. In one embodiment, L3 is greater than or equal to L2 plus the wave height of the first bare wave ring. The axial length of the slit 791 is defined as L4. The membrane support 100 includes a first connection point 103, which is the connection point located at the farthest end of the main support 10 when the branch support 30 and the main support 10 are circumferentially connected. The axial length from the first connection point to the proximity end face of the main membrane 12 is defined as L5, where L4 ≥ 2L5. During membrane removal, when the slits overlap, the length of the overlapping slit at the proximity of the main membrane can be longer, and the timing of the slit forming a non-closed opening at the proximity of the main membrane can be better.

[0068] In this system, one end of the membrane 79 is circumferentially connected to the distal end of the sheath 73. A circumferential connection 797 is located at the distal end of the membrane 79 in its naturally unfolded state. The membrane 79 is connected to the inner wall of the distal end of the sheath 73 via the circumferential connection 797. In the support system 700, as shown... Figure 9 As shown, the membrane 79 is in a folded and wrapped state. When the stent system 700 is transported to the release position, during the retraction of the sheath 73, the membrane 79 also includes a fully wrapped state, a partially wrapped intermediate state, and a detached state, as shown. Figure 10-11As shown, as the sheath 73 is retracted, firstly, the distal end of the sheath 73 is retracted to the distal end of the main support 10, thereby exposing the entire covered support 100, which is wrapped by the membrane 79, from the sheath 73. The sheath 73 causes the third wrapping layer 796 to fold from the outside of the second wrapping layer to the proximal side of the second wrapping layer 794 (since the first wrapping layer 792 and the second wrapping layer 794 are both inside the third wrapping layer 796, and the sheath 73 cannot directly transmit force to the second wrapping layer 794 and the first wrapping layer 792 in the folded state, therefore...). Before the third wrapping layer 796 is completely folded over to the proximal side of the second wrapping layer 794, the retraction of the sheath 73 will not pull on the second wrapping layer 794, nor on the first wrapping layer 792. This allows the first and second wrapping layers 792 to work together to effectively radially compress the covered stent 100 within the first wrapping layer 792 (and since there are no slits 791 on the second wrapping layer 794, the entire covered stent 100 is radially compressed). This ensures that the third and second wrapping layers 796 together wrap around the first wrapping layer 792. Figure 10 As shown, at this time, the membrane 79 is in a fully enclosed state of double-layer wrapping of the membrane-covered support 100, with the inner layer being the first wrapping layer 792 and the outer layers being the axially connected second wrapping layer 794 and third wrapping layer 796. Continuing to retract the sheath 73, the first fold 793 retracts, and the sheath 73 pulls the first wrapping layer 792 through the second wrapping layer 794, causing the distal end of the first wrapping layer 792 to fold and gradually move towards the proximal end. Simultaneously, the slit 791 shows an overlap of the inner and outer layers at the distal end, indicating a semi-enclosed state. Figure 11 Combination Figure 11a As shown, during the release of the main support 10, the slit 791 forms a non-closed opening at the proximal end of the main support 10. When the proximal end of the overlapping slit 791 moves to the main support 10, the proximal end of the main support 10 is gradually released until the first wrapping layer 792 is completely removed from the main support 10. At this time, the wrapping 79 is in the removed state.

[0069] For the main stent 10, which has self-expanding capability in the radial direction, since the capsule 79 radially binds the main stent 10, the main stent 10 still exerts a large radial supporting force on the capsule 79 during the capsule removal process. This results in a large frictional force for the capsule 79 to be removed from the main stent 10. For interventional surgery, since the operating end is outside the patient's body and the implant being operated on is inside the patient's body, it is not suitable for use in interventional devices for processes that require a large force. In the support system 700 provided in this embodiment, due to the radial self-expansion force of the main support 10, when the proximal end of the overlapping slit 791 moves to the proximal end of the main support 10, the double-layer wrapping membrane 79 can form an opening within the overlapping position of the distal slit 791. At this time, the first wrapping layer 792 wrapped on the innermost side gradually detaches from the proximal end of the main support 10 towards the distal end from its distal end towards its proximal end, instead of being directly pulled out from the proximal end 79a of the membrane 79 and removed from the main support 10. The force required to remove the membrane 79 is smaller and easier.

[0070] In other embodiments, the releasable member 74 may also include a releasable suture structure that passes axially through perforations 798 near the edges on both sides of the cut 791 to compress the radial portion of the proximal end of the covered stent 100 within the membrane 79. The releasable member 74 is not limited here, as long as it can cooperate with the cut 791 of the membrane 79 to achieve radial contraction and release of the entire covered stent 100.

[0071] like Figure 3 As shown, the handle assembly 75 includes a fixed handle 751, a sliding handle 752, and a wing 753. The proximal end of the fixed handle 751 includes a guide rail 7511 extending proximally. The proximal end of the sheath 73 is connected to the sliding handle 752. The sliding handle 752 is positioned around the guide rail 7511 on one side of the proximal end of the fixed handle 751, allowing the sliding handle 752 to slide along the guide rail 7511, which can retract the sheath 73 to release the lumen support from the distal end of the sheath 73. The wing 753 is located on the proximal side of the guide rail and has a channel communicating with a channel in the support rod 72 for the adjustable bend catheter to pass through, facilitating operation of the adjustable bend catheter.

[0072] like Figure 12-14As shown, the delivery device also includes a rear-release structure. The distal end of the outer sheath core 712 and the proximal end of the guide head 76 form a rear-release structure, which is used to hook the first bare wave coil 20, thereby realizing the rear release of the first bare wave coil 20 at the proximal end of the covered stent 100. The delivery device includes a locking member 77, which is connected to the distal end of the outer sheath core 712. The locking member 77 includes multiple claws 771 and a connecting portion 772. The proximal end of the guide head 76 is provided with a locking portion 761 and a slot 762. The multiple claws 771 radiate and disperse from the connecting portion 772 toward the distal end. The connecting portion 772 fixes the multiple claws 771 to the distal end of the outer sheath core 712. The multiple claws 771 can respectively engage with the slot 762. 62. A locking part 761 is disposed on the distal side of the locking groove 762. The locking part 761 includes a locking surface 7611 and a locking step 7612. The inner circumferential surface of the sheath 73 is fitted onto the locking surface 7611, and the distal end face of the sheath 73 abuts against the locking step 7612, so that the guide head 76 can be engaged and embedded in the distal end of the sheath 73, while the engaging part of the claw 771 and the locking groove 762 is retracted into the sheath 73. It can be understood that the engagement of the locking piece 77 and the locking groove 762 forms the above-mentioned detachable post-release structure, that is, the post-release structure includes a closable state formed by the engagement of the locking piece 77 and the locking groove 762, and an openable state formed by the locking piece 77 and the locking groove 762 being far apart from each other. When in the closable state, the post-release structure can temporarily fix the first bare wave coil 20 at the proximal end of the covered stent 100 before post-release.

[0073] The pre-placed catheter extends within the lumen of the main stent 10, and the pre-placed catheter and the main stent 10 are axially movable relative to each other. The distal end of the pre-placed catheter enters from the distal end of the main stent 10 and exits from the branch stent 30. The pre-placed catheter allows for direct selection of branch vessels without the need for puncturing or cutting the other end of the branch vessel to capture the branch guidewire, reducing patient discomfort. It also avoids the problem of the guidewire easily becoming entangled with the ultra-rigid guidewire of the main stent 10 during capture, reducing the surgical difficulty and time for the surgeon during branch selection.

[0074] like Figure 15-22As shown, the pre-set conduit can be configured as an adjustable bend conduit 78. The adjustable bend conduit 78 includes an adjustable bend 781 and an adjusting member 782. The adjustable bend 781 includes an extension section 7811 and an adjustable bend section 7812. The adjustable bend section 7812 is disposed on the distal end side of the extension section 7811. The adjustable bend section 7812 can refer to the portion of the adjustable bend 781 from the position corresponding to the distal end face of the limiting hole 783 to the position where the distal end of the adjustable bend 781 is connected to the distal end 7821 of the adjusting member 782. The axial length of the adjustable bend section 7812 when it is not bent can be set in the range of 0.5cm to 10cm. The adjustable bend conduit 78 also includes a limiting hole 783, which is located on the proximal side of the adjustable bend section 7812. The limiting hole 783 can be located on the wall of the adjustable bend 781 or outside the wall of the adjustable bend 781. The adjusting member 782 includes a distal end 7821 and an adjusting section 7822. The distal end 7821 of the adjusting member 782 is connected to the distal end of the adjustable bend 781. The adjusting member 782 passes through the limiting hole 783 and extends towards the proximal end, thereby forming the adjusting section 7822 between the limiting hole 783 and the distal end 7821. This allows the adjusting member 782 to bend the distal end of the adjustable bend 781 when the adjusting member 782 is pulled back, thereby achieving the adjustment of the adjustable bend section 7812. It is understandable that the adjusting member 782 can be configured as a pull line extending along the axial direction. The adjusting member 782 extends towards the proximal end to the operating handle and extends beyond the operating handle. A bending button can be provided at the proximal end of the adjusting member 782, so that the adjusting member 782 can be pulled back by the bending button, so that the adjusting member 782 moves relative to the adjustable bend tube 781 along the axial direction, thereby driving the adjusting section 7822 to bend.

[0075] Furthermore, the adjustable bend 781 includes a first lumen, and the limiting hole 783 includes a lumen structure extending axially. The distal end of the limiting hole 783 extends to the proximal side of the adjustable bend 7812. In one embodiment, the lumen structure is configured as a second lumen 783a, and the distal end of the second lumen 783a extends to the proximal side of the adjustable bend 7812, thus the adjustable bend catheter 78 forms a double lumen. The first lumen 78a and the limiting hole 783 can be configured not to communicate with each other, so as to avoid affecting the independence and inner wall smoothness of the first lumen 78a when the adjusting member 782 extends along the second lumen 783a. This ensures that after the adjustable bend 7812 of the adjustable bend catheter 781 is bent, the (ultra-fine or ultra-rigid) guidewire along the first lumen 78a of the adjustable bend catheter 78 can be inserted into the branch blood vessel without obstruction.

[0076] Taking the limiting hole 783 as an example of a second cavity 783a extending axially, it can be understood that when the adjusting member 782 of the adjustable bend conduit 78 does not bend the adjustable bend section 7812, both the adjustable bend conduit 781 and the adjusting member 782 are in a straight state, and the adjusting section 7822 of the adjusting member 782 is attached to the outer wall of the adjustable bend section 7812. Figure 17 Combination Figure 19 As shown; when the adjusting member 782 is pulled backward, part of the adjusting section 7822 enters the second cavity 783a from the distal end of the second cavity 783a. The distal end of the adjustable bending section 7812 is bent towards the side connected to the adjusting member 782, thereby causing the part of the adjusting section 7822 exposed outside the second cavity 783a to deviate from the arc formed by the adjustable bending section 7812, as shown. Figure 18 As shown. The adjustable bendable catheter 78 can be configured to bend the adjustable bend segment 7812 of the adjustable bendable catheter 78 and align it with the branch vessel opening after the main stent 10 is released. The bent adjustable bend segment 7812 can be directly inserted into the branch vessel, or the adjustable bendable catheter 78 can be used as a guide to directly insert an ultra-fine guidewire into the branch vessel. No limitation is made here.

[0077] Furthermore, the second cavity 783a can be disposed on the wall of the adjustable bend 781, extending axially along the wall of the adjustable bend 781 to form a cavity-shaped hole. The wall of the adjustable bend 781 can sequentially include a braided layer 7813 and a polymer layer 7814 from the inside to the outside. The second cavity 783a is disposed on the polymer layer 7814. Generally, the thickness of the polymer layer 7814 is increased so that its thickness slightly exceeds the size of the second cavity 783a. The second cavity 783a can be formed in the polymer layer 7814. Figure 16 As shown. In other embodiments, such as Figure 21 As shown, the second lumen 783a is located outside the adjustable bend 781. The wall of the adjustable bend 781, from the inside to the outside, may sequentially include a braided layer 7813 and a polymer layer 7814. The adjustable bend conduit 78 also includes an arc-shaped wall 7815, which extends axially and is located outside the polymer layer 7814. The second lumen 783a is formed axially between the arc-shaped wall 7815 and the outer wall of the polymer layer, and the distal end of the arc-shaped wall 7815 extends to the proximal end of the adjustable bend section 7812. By placing the second lumen 783a outside the adjustable bend 781, the overall outer diameter of the adjustable bend conduit 78 is reduced, especially the thickness of the polymer layer 7814, which can greatly improve the overall flexibility of the adjustable bend conduit 78. In other embodiments, such as... Figure 22As shown, the limiting hole portion 783 includes a limiting ring, which is disposed on the outside of the adjustable bend 781 and located on the proximal side of the adjustable bend section 7812, so that the distal end 7821 of the adjusting member 782 can be connected to the distal end of the adjustable bend 781. The adjusting member 782 passes through the limiting ring and extends toward the proximal end, thereby forming its adjusting section 7822 between the limiting ring and the distal end 7821.

[0078] The stent system 700 also includes an ultra-fine guidewire. The adjustable bend 7812 of the adjustable bend catheter 781, after being bent, can be used to guide the ultra-fine guidewire, facilitating its insertion into the branch vessel. After the ultra-fine guidewire has entered the branch vessel to a certain length (ensuring that the ultra-fine guidewire does not exit the branch vessel after the adjustable bend catheter 78 is unbent), the bend of the adjustable bend 7812 can be removed, causing the adjustment segment 7822 to adhere to the outer wall of the adjustable bend 7812, rather than being far from it. Pushing forward the adjustable bend catheter 78 allows it to follow the ultra-fine guidewire into the branch vessel. After the adjustable bend catheter 781 is inserted into the branch vessel, the ultra-fine guidewire is withdrawn, and then an ultra-stiff guidewire is inserted along the adjustable bend catheter 781 into the branch vessel. This stent system 700 allows the ultra-rigid guidewire selected into the branch vessel to be used as a delivery pathway for the external small branch. During the entry of the adjustable-bend catheter 78 into the branch vessel, the adjustable-bend segment 7812 guides the ultra-fine guidewire into the branch vessel. Then, the ultra-fine guidewire already in the branch vessel guides the adjustable-bend catheter 78. As a result, during the entry of the adjustable-bend catheter 78 into the branch vessel, the ultra-fine guidewire can guide the adjustable-bend catheter 78 without the adjustable-bend segment 7812 needing to remain bent. That is, during the entry of the adjustable-bend catheter 78 into the branch vessel, the adjusting segment 7822 can be kept attached to the outer wall of the adjustable-bend segment 7812, rather than away from the adjustable-bend segment 7812, thereby avoiding the possibility of damage to the vessel by the adjusting segment 7822.

[0079] In one implementation, such as Figure 23-24As shown, when the diameter detachable member 74 is provided, in the loaded state of the support system 700, the distal end of the adjustable bend conduit 78 extends beyond the second end 33 of the branch support 30 and passes through the gap formed when the diameter detachable member 74 passes through and encloses the slit 791. The diameter detachable member 74 passes through the gap between the adjustment section 7822 and the adjustable bend section 7812 and is located between the distal end 7821 of the adjustment member 782 and the limiting hole 783. Combined with the intersection formed by the distal end 7821 of the adjustment member 782 and the distal end of the adjustable bend 781, the diameter detachable member 74 has a limiting effect on this intersection. This makes it easy for the distal end of the adjustable bend conduit 78 to extend out of the sheath 79 and to always keep part of the adjustable bend conduit 78. The distal end 7821 of the adjustable bend conduit 78 will not be brought into the sheath 79 due to the friction of the sheath 73 retracting, which is not conducive to the subsequent extension of the adjustable bend conduit 78 out of the sheath 79. The adjustable bending guide tube 78 also includes a limiting buckle 784, which is disposed on the distal side of the limiting hole portion 783 and close to the limiting hole portion 783, so that a limiting hole 785 is formed between the adjustable bending section 7812 and the adjusting member 782 between the limiting buckle 784 and the distal end of the limiting hole portion 783. The diameter release member 74 can pass through the limiting hole 785. Combined with the limiting effect of the diameter release member 74, the possibility of the adjustable bending guide tube 78 retracting axially can be further reduced, so that the entire adjustable bending section 7812 is kept outside the membrane 79, which facilitates the subsequent adjustment of the bending state.

[0080] In other embodiments, when the detachable bundle diameter member 74 is not required, the capsule 79 includes a naturally unfolded state and a folded wrapped state. The distal end of the adjustable bendable catheter 78 enters from the distal end of the main stent 10 and exits from the branch stent 30. The distal end of the adjustable bendable catheter 78 and the branch stent 30 are wrapped together in the first wrapping layer 792, and the distal end of the adjustable bendable catheter 78 extends at least beyond the proximal end of the main stent 10. Taking the insertion of the stent system 700 into the aortic arch as an example, the surgical procedure of the stent system 700 provided in this embodiment is briefly summarized as follows:

[0081] First, the stent system 700 is advanced along the guidewire pathway to the aortic arch. Then, the sheath 73 is withdrawn, causing the third sheath 796 to fold from the outside of the second sheath to the proximal side of the second sheath 794. This allows the third sheath 796 and the second sheath 794 to together wrap around the first sheath 792, resulting in a fully encapsulated state of the capsule 79. Figure 25 Combination Figure 9-10 As shown;

[0082] Then, push the adjustable bendable catheter 78 forward so that its distal end extends beyond the capsule 79, thus exposing the adjustable bendable catheter 78 outside the capsule 79. Adjust the adjusting element 782 of the adjustable bendable catheter 78 so that the adjustable bend segment 7812 is aligned with the branch vessel opening. Insert an ultra-fine guidewire into the lumen of the adjustable bendable catheter 781, guiding the ultra-fine guidewire a certain length into the branch vessel (to prevent the ultra-fine guidewire from dislodging when the adjustable bendable catheter 78 is subsequently introduced into the branch vessel). Then, cancel the adjustment of the adjustable bend segment 7812 and continue pushing the adjustable bendable catheter 78 forward so that it enters the branch vessel along the ultra-fine guidewire. Withdraw the ultra-fine guidewire and insert an ultra-rigid guidewire 83 into the lumen of the adjustable bendable catheter 781. Guide the ultra-rigid guidewire 83 into the branch vessel along the adjustable bendable catheter 78, thereby establishing a branch channel. Figure 26 As shown. (For branch vessels that do not extend from the branch opening in a direction away from the heart, i.e., branch vessels with an excessively twisted branch angle, the ultra-fine guidewire may not be used. After the adjustable bend segment 7812 is adjusted, when the distal end of the adjustable bend catheter 78 is directly facing the branch vessel opening, the ultra-rigid guidewire is directly inserted into the lumen of the adjustable bend catheter 781 and introduced into the branch vessel along the adjustable bend catheter 78.)

[0083] like Figure 27 As shown, withdraw the adjustable bendable catheter 78; continue to withdraw the sheath 73, so that the capsule 79 is in a semi-enclosed state, combined with Figure 11-11a As shown, when the proximal end of the overlapping suture 791 located on the outer side is retracted to the first connection point, the branch stent 30 is exposed from the capsule 79. At this time, due to the radial constraint of the release structure after the capsule 79 is combined with the first bare wave coil 20, the expansion at the proximal end of the main stent 10 is not significant, and the stent system 700 can be further fine-tuned. With the help of the ultra-hard guidewire, the branch stent 30 is made to adhere to the branch vessel orifice. The sheath 73 is then further retracted, allowing the capsule 79 to gradually detach from the main stent 10, thereby completely releasing the main stent 10. Figure 28 As shown;

[0084] Finally, the outer sheath core 712 is withdrawn, the release structure is released, the first bare wave coil 20 is attached to the wall, and the delivery device 70 is withdrawn, thereby taking the membrane 79 out of the patient's body.

[0085] 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.

[0086] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A support system, characterized in that, The stent system includes a covered stent and a conveying device. The covered stent includes a main stent, which includes a main corrugated coil and a main covering. The main covering covers the main corrugated coil. The conveying device includes a semi-binding structure, which includes a membrane. The membrane releasably binds the main stent to allow the main stent to be radially compressed or released. The membrane includes a slit, which is correspondingly located on the proximal end of the main stent. During the release of the main stent, the slit forms a non-closed opening at the proximal end of the main stent to facilitate the removal of the membrane from the main stent.

2. The support system according to claim 1, characterized in that, The coating support also includes a branch support, which is disposed on one side of the main support. The conveying device includes a sheath core assembly, a support rod, and a sheath tube, which are sequentially sleeved from the inside to the outside. The sheath tube can move axially relative to the sheath core assembly. The distal end of the slit starts from the distal end of the coating and the proximal end of the slit passes over the branch support. The proximal end of the coating is circumferentially connected to the distal end of the support rod, which can move axially relative to the sheath core assembly.

3. The support system according to claim 2, characterized in that, Two rows of perforations are provided on both sides of the cut. The semi-binding structure also includes a detachable member with a detachable diameter. The distal end of the detachable member is sequentially sewn or passed through the perforations.

4. The support system according to claim 1, characterized in that, The covered stent also includes a branch stent, which is disposed on one side of the main stent. The delivery device also includes a pre-placed conduit, the distal end of which enters from the distal end of the main stent and exits from the branch stent.

5. The support system according to claim 1, characterized in that, The pre-installed conduit is configured as an adjustable bend conduit, which includes an adjustable bend and an adjusting member. The adjustable bend includes an extension section and an adjustable bend section, with the adjustable bend section located at the distal end of the extension section. The adjustable bend conduit also includes a limiting hole located at the proximal end of the adjustable bend section. The adjusting member includes a distal end and an adjusting section. The distal end of the adjusting member is connected to the distal end of the adjustable bend conduit. The adjusting member passes through the limiting hole and extends towards the proximal end, thereby forming the adjusting section between the limiting hole and the distal end.

6. The support system according to claim 5, characterized in that, The semi-binding structure also includes a detachable beam diameter member, which cooperates with the membrane to achieve radial constriction and release of the covered stent. The detachable beam diameter member passes through the gap between the adjustment section and the adjustable bending section.

7. The support system according to claim 1, characterized in that, The coated support also includes a branch support, which is disposed on one side of the main support. The delivery device includes a sheath core assembly, a support rod, and a sheath tube. The sheath core assembly includes an inner sheath core and an outer sheath core. The inner sheath core, outer sheath core, support rod, and sheath tube are sequentially sleeved from the inside to the outside, and each pair of the inner sheath core, outer sheath core, and sheath tube can move relative to each other along the axial direction. The coated support also includes a first bare wave coil. The support system includes a rear release structure. The distal end of the outer sheath core and the proximal end of the guide head form a rear release structure. The rear release structure is used to hook the first bare wave coil, thereby realizing the rear release of the first bare wave coil.

8. The support system according to claim 7, characterized in that, The membrane includes a naturally unfolded state and a folded wrapped state. In the folded wrapped state, the membrane includes a first wrapping layer, a first fold, a second wrapping layer, a second fold, a third wrapping layer, and a circumferential connection. The membrane forms a first wrapping layer from the first fold towards the proximal end, and the covered stent is wrapped within the first wrapping layer. The membrane is folded outward from the distal end towards the proximal end in the naturally unfolded state along the first fold, thereby forming a second wrapping layer on the outside of the first wrapping layer. Based on this, the membrane continues to be folded outward from the distal end towards the second fold, thereby forming the third wrapping layer on the outside of the second wrapping layer. The slit extends from the first fold towards the proximal end beyond the branch stent.

9. The support system according to claim 8, characterized in that, Let L1 be the axial length of the membrane in its naturally unfolded state, and L2 be the axial length of the main body covering. Then L1 and L2 satisfy: L1 > 2L2.

10. The support system according to claim 9, characterized in that, The axial length from the first fold to the proximal end of the membrane is defined as L3, where L3 and L2 satisfy the condition: L3 > L2.

11. The support system according to claim 9, characterized in that, The covered stent includes a first connection point, which is the connection point located at the farthest end of the main stent when the branch stent and the main stent are circumferentially connected. The axial length from the first connection point to the proximal end face of the main covered stent is defined as L5, and L4 and L5 satisfy: L4≥2L5.

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