Intravascular stent and stent system

Abstract

The utility model relates to an intravascular stent, a stent system and a windowing area adjusting method, a stent body section is provided with a stent body inner cavity with two through ends, a branch window penetrating through the stent body inner cavity is formed in the side wall of the stent body section, and the branch window is located on the side wall of the first end of the stent body section and formed to the end side of the first end of the stent body section; the pipe body section is provided with a pipe body inner cavity with two through ends, and one end part of the pipe body section is connected with the second end part of the frame body section, so that the pipe body inner cavity is communicated with the frame body inner cavity. The branch windows of the two intravascular stents can be spliced into a complete closed window, and the overlapped length of the two intravascular stents can be adjusted to adapt to the actual sizes of the three branches on the arch to construct a windowing area with a proper size, so that the blood supply of the three branches on the arch is ensured. When the stent is used for interventional operation, in-vitro windowing or in-situ windowing is not needed, and when the stent is used for open operation, the number of anastomotic stomas can be reduced, the circulation stopping time can be shortened, and meanwhile the three-branch anatomical structure on the arch can be reserved. Therefore, the existing operation requirements are met.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and particularly to vascular stents and stent systems. Background Art

[0002] Aortic dissection is a critical cardiovascular disease that seriously threatens human life and health. The surgical treatment methods for aortic dissection mainly include endovascular repair, open surgery, and hybrid surgery. For the case where the three branches above the aortic arch are not diseased, the conventional open surgery uses an artificial blood vessel to replace the diseased aortic arch, cuts the artificial blood vessel into an island shape, and then anastomoses the artificial blood vessel with the autologous blood vessel, that is, island anastomosis. However, how to prevent bleeding at the anastomosis suture point during this process remains a difficult problem. More and more endovascular repair techniques have emerged, but there are still many technical difficulties and defects.

[0003] The fenestration technique involves making fenestrations at appropriate positions on the stent according to the positions of the branches on the arterial arch. The fenestration technique is divided into in vitro fenestration and in situ fenestration (i.e., in vivo fenestration). It is difficult to accurately locate the branch openings and fenestration positions in in vitro fenestration, and the technical difficulty of in situ fenestration is relatively large. In short, the conventional fenestration techniques cannot meet the existing surgical requirements. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a vascular stent and a stent system for the above-mentioned technical problems.

[0005] The present application provides a vascular stent, which includes:

[0006] A frame body section, the frame body section has a frame body lumen that penetrates through both ends, and a branch window that penetrates through the frame body lumen is provided on the side wall of the frame body section. The branch window is located on the side wall of the first end of the frame body section and extends to the end side of the first end of the frame body section;

[0007] A tube body section, the tube body section has a tube body lumen that penetrates through both ends, and one end of the tube body section is connected to the second end of the frame body section, so that the tube body lumen is communicated with the frame body lumen;

[0008] Wherein, the branch window of the vascular stent is used to be spliced with the branch window of another matching vascular stent to form a closed window.

[0009] In one embodiment, the vascular stent includes:

[0010] A film body, the film body covers the surface of the frame body section, and the film body does not cover the branch window; and / or,

[0011] A developing element, the developing element is disposed on the surface of the frame section, and the developing element is located at the edge of the branch window.

[0012] In one embodiment, the frame section includes:

[0013] A main body frame section;

[0014] A windowed frame section, the branch window is opened at a first end of the windowed frame section, a first end of the main body frame section is connected to a second end of the windowed frame section, a second end of the main body frame section is used for connecting to an end of the tube section, and the film body covers at least one surface of the main body frame section and the windowed frame section.

[0015] In one embodiment, the opening shape of the branch window is at least one of a quadrilateral, a pentagon, a semi - circle, and a semi - circular arc; and / or,

[0016] The opening width of the branch window in the circumferential direction of the frame section is between 10 mm and 20 mm; and / or,

[0017] The opening length of the branch window in the axial direction of the frame section is between 40 mm and 50 mm.

[0018] In one embodiment, the material of the frame section is at least one of nickel - titanium metal and stainless steel; and / or,

[0019] The diameter of the frame section is between 24 mm and 40 mm; and / or,

[0020] The diameter of the tube section is between 24 mm and 40 mm; and / or,

[0021] The length of the tube section is between 5 mm and 10 mm.

[0022] In one embodiment, the length of the main body frame section is between 30 mm and 60 mm.

[0023] In one embodiment, the frame section includes a plurality of annular unit frames, and the plurality of annular unit frames are arranged along the axial direction of the frame section, thereby forming the frame section.

[0024] The present application provides a stent system, and the stent system includes at least two of the vascular stents.

[0025] In one embodiment, the vascular stent is a variable - diameter stent that can be radially deformed; or,

[0026] At least two of the plurality of vascular stents have different diameters.

[0027] In one embodiment, the diameter of at least one of the plurality of vascular stents gradually decreases in the direction from the first end to the second end of the stent body segment, and the diameter of at least one of the vascular stents gradually increases in the direction from the first end to the second end of the stent body segment.

[0028] In the above-mentioned vascular stent and stent system, the branch windows of two vascular stents can be spliced into a complete closed window. Moreover, by adjusting the overlapping length of the two vascular stents, it is possible to adapt to the actual size of the three branches above the aortic arch to construct a windowing area of a suitable size, retain the anatomical structure of the three branches above the aortic arch, and ensure the blood supply of the three branches above the aortic arch.

[0029] This vascular stent can be used for both interventional surgery and open surgery. When used for interventional surgery, there is no need for extracorporeal windowing or in-situ windowing. When used for open surgery, it can reduce the number of anastomotic sites, shorten the cardiopulmonary bypass time, and at the same time retain the anatomical structure of the three branches above the aortic arch. Thus, it meets the existing surgical needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a vascular stent provided in an embodiment of the present application.

[0031] Figures 2a to 2c It is a schematic diagram of the shape of an annular unit frame provided in some embodiments of the present application.

[0032] Figures 3a to 3c It is a schematic diagram of the shape of a branch window provided in some embodiments of the present application.

[0033] Figure 4 It is a schematic diagram of the intraoperative use state of a vascular stent provided in an embodiment of the present application.

[0034] Figures 5a to 5c It is a schematic diagram of the steps of a method for adjusting the windowing area of a vascular stent provided in an embodiment of the present application.

[0035] Figures 6a to 6c It is a schematic diagram of the steps of a method for adjusting the windowing area of a vascular stent provided in another embodiment of the present application.

[0036] Reference Numerals in the Drawings:

[0037] 100, vascular stent; 200, brachiocephalic trunk artery; 300, left common carotid artery; 400, left subclavian artery; 500, ascending aorta; 600, descending aorta;

[0038] 100a, closed window;

[0039] 1000, frame section; 2000, pipe section; 3000, film covering body; 1000a, branch window; 1000b, annular unit frame; 1100, main frame section; 1200, window-opening frame section. Detailed implementation manner

[0040] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manner of the present application with reference to the accompanying drawings. Many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0041] In the description of the present application, it should be understood that if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0042] In addition, if terms such as "first" and "second" appear, these terms are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0043] In the present application, unless otherwise clearly specified and limited, if terms such as "installation", "connection", "connection", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] In this application, unless otherwise clearly defined and limited, when a first feature is described as being "on" or "under" a second feature or the like, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0045] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate 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 intermediate element at the same time. If so, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0046] Refer to Figure 1 As shown, an embodiment of the present application provides a vascular stent 100, and the vascular stent 100 includes a frame segment 1000 and a tube segment 2000. The frame segment 1000 is the regional part of the vascular stent 100 for supporting the target blood vessel, and can form a frame structure similar to a tube, which is adapted to the tubular structure of the target blood vessel. For example, in one of the embodiments, the frame segment 1000 may include a plurality of annular unit frames 1000b, and the plurality of annular unit frames 1000b may be substantially in a parallel arrangement state, and the plurality of annular unit members are arranged along the axial direction of the frame segment 1000, thereby constituting the complete frame segment 1000. Among them, when the frame segment 1000 is covered with a film, axial connection of a plurality of annular unit members can be formed through the film covering. If the frame segment 1000 is only an independent frame without a film, adjacent annular unit members among the plurality of annular unit members can be axially connected.

[0047] It can be seen from this that the frame structure similar to a tube formed by the frame segment 1000 is not a surface-sealed frame structure, but a frame structure with an outer contour shape similar to a tube formed after a plurality of annular unit frames 1000b are connected to each other, so that an inner cavity of the frame that penetrates through both ends is formed inside the frame segment 1000, and the inner cavity of the frame is also a non-closed space environment. The connection of a plurality of annular unit frames 1000b can construct the vascular stent 100 into an open-loop structure, so that the vascular stent 100 has excellent flexibility and is suitable for being placed in the ascending aorta 500, aortic arch, and descending aorta 600.

[0048] In one of the embodiments, refer toFigures 2a to 2c As shown, the annular unit frame 1000b can adopt various unit frame shapes such as a circular ring, a spiral ring, and a wavy ring. Those skilled in the art can set the unit frame shape of the annular unit frame 1000b according to actual needs, thereby constructing the frame structure of the frame section 1000 to meet the intraoperative requirements, which are not limited herein.

[0049] The frame section 1000 needs to have the ability to deform, so that the frame section 1000 can form a radial contraction when subjected to an external force and can maintain a certain radial diameter size when not subjected to an external force. For example, in one embodiment, the material of the frame section 1000 can be made of nitinol metal material, stainless steel material, etc. The vascular stent 100 can first be in a radially contracted state under the action of a suitable stent delivery device and be assembled in the stent delivery device for delivery to the target blood vessel.

[0050] When the vascular stent 100 is delivered to the target position, the stent delivery device can release the vascular stent 100 and cancel the radial force applied to the vascular stent 100, so that the vascular stent 100 reduces the radial force and presents a radially expanded state. At this time, although the vascular stent 100 does not receive the radial force applied by the stent delivery device, the vascular stent 100 is supported on the inner wall of the target blood vessel and will also receive the radial force applied by the inner wall of the blood vessel. Therefore, a balanced force state can be formed between the vascular stent 100 and the inner wall of the target blood vessel, thereby stably supporting at the target position.

[0051] A covering body 3000 can be provided on the surface of the frame section 1000 according to needs, so that the vascular stent 100 becomes a covered stent. In one embodiment, the material of the covering body 3000 can be at least one of polyester (PET), polytetrafluoroethylene (PTFE), and expanded polytetrafluoroethylene (ePTFE). The covering body 3000 can be connected to the frame section 1000 in various ways such as suture connection and heat fusion connection. The covering body 3000 covers the surface of the frame section 1000, but the branch window 1000a needs to be exposed outside the covering body 3000 and not be covered by the covering body 3000.

[0052] The tube section 2000 is part of the artificial blood vessel, and the artificial blood vessel is used to be connected to the autologous blood vessel in the human body during the operation. A branch window 1000a that penetrates the inner cavity of the frame along the radial direction of the frame section 1000 is provided on the side wall of the frame section 1000. The branch window 1000a is located on the side wall of the first end of the frame section 1000 and extends to the end side of the first end of the frame section 1000. The tube section 2000 has a through inner cavity at both ends. One end of the tube section 2000 is connected to the second end of the frame section 1000, so that the inner cavity of the tube is communicated with the inner cavity of the frame. Among them, the first end of the frame section 1000 can be expressed as Figure 1At the left end of the middle frame segment 1000, the second end of the frame segment 1000 can be represented as Figure 1 The right end of the middle frame segment 1000. When in use, two vascular stents 100 need to be spliced and matched with each other, that is, the branch window 1000a of the vascular stent 100 is used to be spliced with the branch window 1000a of another cooperating vascular stent 100 to form a closed window 100a.

[0053] In one embodiment, the frame segment 1000 can be divided into a main frame segment 1100 and a windowing frame segment 1200. The branch window 1000a is opened at the first end of the windowing frame segment 1200. The first end of the main frame segment 1100 is connected to the second end of the windowing frame segment 1200. The second end of the main frame segment 1100 is used to be connected to the end of the tube segment 2000. The film body 3000 covers at least one of the surfaces of the main frame segment 1100 and the windowing frame segment 1200, but does not cover the branch window 1000a to ensure that the branch window 1000a is exposed. Among them, the first end of the main frame segment 1100 can be represented as Figure 1 The left end of the main frame segment 1100, and the second end of the main frame segment 1100 can be represented as Figure 1 The right end of the main frame segment 1100. The first end of the windowing frame segment 1200 can be represented as Figure 1 The left end of the windowing frame segment 1200, and the second end of the windowing frame segment 1200 can be represented as Figure 1 The right end of the windowing frame segment 1200.

[0054] The windowing shape of the branch window 1000a can be set to shapes such as quadrilateral, pentagon, semi-circular, and semi-circular arc, or a combined shape of these shapes. For example Figure 3a As shown, the windowing shape of the branch window 1000a can be set to a quadrilateral. For example Figure 3b As shown, the windowing shape of the branch window 1000a can be set to a pentagon, which can also be understood as a combined shape of a quadrilateral and a triangle. For example Figure 3c As shown, the windowing shape of the branch window 1000a can be set to a semi-circular arc, which can also be understood as a combined shape of a quadrilateral and a semi-circle. Those skilled in the art can select the windowing shape of the branch window 1000a according to needs, and no limitation is made here.

[0055] The opening width of the branch window 1000a in the circumferential direction of the frame body section 1000 can be set between 10 mm and 20 mm, such as 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm. The opening length of the branch window 1000a in the axial direction of the frame body section 1000 can be set between 40 mm and 50 mm, such as 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, 49 mm, 50 mm. The diameter of the frame body section 1000 is between 24 mm and 40 mm, such as 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 36 mm, 38 mm, 40 mm. The diameter of the tube body section 2000 is between 24 mm and 40 mm, such as 24 mm, 26 mm, 28 mm, 30 mm, 32 mm, 36 mm, 38 mm, 40 mm. The length of the tube body section 2000 is between 5 mm and 10 mm, such as 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm. The length of the main body frame section 1100 can be set between 30 mm and 60 mm, such as 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm. Those skilled in the art can set various dimensions according to requirements, which are not limited herein.

[0056] In one embodiment, the vascular stent 100 includes a developing element, which is disposed on the surface of the frame body section 1000, and the developing element can be disposed near the branch window 1000a, for example, directly disposing the developing element at the edge of the branch window 1000a. The number of developing elements can also be set to multiple according to requirements. Arranging multiple developing elements along the edge of the branch window 1000a can form a general outline of the branch window 1000a for positioning the position of the branch window 1000a during the operation. The developing element can adopt developing points, gold wires and other elements that can be developed under rays. Those skilled in the art can select the material, structure, number, arrangement method and position of the developing element according to requirements, which are not limited herein.

[0057] The present application provides a stent system. The stent system includes at least two vascular stents 100. For example, the stent system includes two cooperating vascular stents 100. The two vascular stents 100 are used to sleeve each other, so that two branch windows 1000a of the two vascular stents 100 are spliced with each other to form a closed window 100a. The closed window 100a is used to expose the brachiocephalic trunk artery 200, left common carotid artery 300, and left subclavian artery 400 of the branches on the target blood vessel. By controlling the relative axial movement of the two vascular stents 100, the window opening area of the formed closed window 100a is adjusted to adapt to the lengths of the brachiocephalic trunk artery 200, left common carotid artery 300, and left subclavian artery 400, which is applicable to different patients and improves the adaptability.

[0058] When the two vascular stents 100 are sleeved with each other, the diameters of the two vascular stents 100 can be limited to be different. At this time, the two vascular stents 100 with different diameters can be directly sleeved with each other due to the different diameters. Alternatively, the vascular stent is a variable-diameter stent that can be radially deformed. For example, the vascular stent 100 has the ability to deform, so that the vascular stent 100 can form a radial contraction when subjected to an external force and can maintain a certain radial diameter size when not subjected to an external force. Furthermore, by adjusting the splicing position of the two vascular stents 100 to a state with different diameters, the two vascular stents 100 can be sleeved with each other. Or, the diameter of one vascular stent 100 gradually decreases from the first end to the second end of the stent body section 1000, and the diameter of one vascular stent 100 gradually increases from the first end to the second end of the stent body section 1000. At this time, the two vascular stents 100 can respectively have end heads with different diameters, so that a diameter difference can be formed at the splicing position of the two vascular stents 100, thereby enabling the two vascular stents 100 to be sleeved with each other.

[0059] Refer to Figure 4 As shown, during the operation, one vascular stent 100 can be first introduced and released into the target blood vessel, and then the second vascular stent 100 is introduced. If a developing element is provided, observation and positioning can be performed through the developing element to adjust the release position of the second vascular stent 100, thereby adjusting the overlapping length of the two vascular stents 100 and the window opening area of the formed closed window 100a to adapt to different aortic arches and branch artery diameters and lengths of different patients.

[0060] As can be seen from the above, the branch windows 1000a of two vascular stents 100 can be spliced into a complete closed window 100a. Moreover, by adjusting the overlapping length of the two vascular stents 100, it is possible to adapt to the actual sizes of the three branches above the aortic arch (such as the brachiocephalic trunk artery 200, the left common carotid artery 300, and the left subclavian artery 400) to construct a fenestration area of a suitable size, preserve the anatomical structures of the three branches above the aortic arch, and ensure the blood supply of the three branches above the aortic arch. At this time, the autologous blood vessels at the three branches of the aortic arch do not need to be anastomosed with the two vascular stents 100, which can reduce the number of anastomotic sites.

[0061] The vascular stent 100 can be used for both interventional surgery and open surgery. When used for interventional surgery, there is no need for extracorporeal or in-situ fenestration. When used for open surgery, it can reduce the number of anastomotic sites, shorten the circulatory arrest time, and at the same time preserve the anatomical structures of the three branches above the aortic arch.

[0062] Based on the fenestration area adjustment method of the vascular stent 100, two vascular stents 100 can be selected. Or it can also be understood that based on the fenestration area adjustment method of the stent system, any two vascular stents 100 are selected from the stent system.

[0063] The fenestration area adjustment method may include the following steps: For example, the stent segments 1000 of the two vascular stents 100 can be sleeved with each other so that the two branch windows 1000a of the two vascular stents 100 are spliced with each other to form a closed window 100a, and the axial relative movement of the two vascular stents 100 is controlled to adjust the fenestration area of the formed closed window 100a. At this time, the diameters of the two vascular stents 100 can be the same or comparable. Or, two vascular stents 100 with different diameters are selected, the stent segments 1000 of the two vascular stents 100 are sleeved with each other, and the stent segment 1000 of the vascular stent 100 with a larger diameter is located inside the stent segment 1000 of the vascular stent 100 with a smaller diameter so that the two branch windows 1000a of the two vascular stents 100 are spliced with each other to form a closed window 100a, and the axial relative movement of the two vascular stents 100 is controlled to adjust the fenestration area of the formed closed window 100a. At this time, the outer diameter of one vascular stent 100 is slightly larger than the inner diameter of the other vascular stent 100, which can cause the two vascular stents 100 to be locked with each other due to different diameter differences to prevent the two vascular stents 100 from relatively detaching after the vascular stents 100 are released.

[0064] In one embodiment, reference can be made to Figure 4 and Figures 5a to 5c as shown, for example, the vascular stent 100 is used to treat aortic dissection through endovascular interventional techniques.

[0065] First, a vascular access can be established using standard techniques. The first vascular stent 100 is introduced and released through a suitable stent delivery device. Refer to Figure 5bAs shown, at this time, the tube body section 2000 of the vascular stent 100 is at the end close to the heart. The part of the frame body section 1000 close to the tube body section 2000 (i.e., the main frame section 1100) is located in the ascending aorta 500, and the part of the frame body section 1000 far from the tube body section 2000 (i.e., the fenestrated frame section 1200) is located in the aortic arch. The openings of the three branches of the aortic arch are located in the branch window 1000a of the frame body section 1000 and are exposed through the branch window 1000a. Then, refer to Figure 5c As shown, a second vascular stent 100 is introduced through a stent delivery device. At this time, the part of the frame body section 1000 of the second vascular stent 100 close to the tube body section 2000 (i.e., the main frame section 1100) is located in the descending aorta 600, and the part of the frame body section 1000 far from the tube body section 2000 (i.e., the fenestrated frame section 1200) is located in the aortic arch.

[0066] The operator can observe and position through the imaging element, adjust the release position of the second vascular stent 100, and release the second vascular stent 100 after the release position is determined. Adjust the overlapping length of the two by adjusting the axial relative position of the first vascular stent 100 and the second vascular stent 100 so that the two branch windows 1000a of the two vascular stents 100 are spliced together to form a closed window 100a, and adjust the fenestration area of the closed window 100a to ensure that the three supra-aortic branch vessels are completely located in the closed window 100a, thereby ensuring sufficient blood supply to the three supra-aortic branches.

[0067] In another embodiment, refer to Figure 4 and Figures 6a to 6c As shown. First, thoracotomy is performed and extracorporeal circulation is established. The first vascular stent 100 is introduced and released through a suitable stent delivery device. Refer to Figure 6b As shown, at this time, the part of the frame body section 1000 of the vascular stent 100 far from the tube body section 2000 (i.e., the fenestrated frame section 1200) is located in the aortic arch, the part of the frame body section 1000 close to the tube body section 2000 (i.e., the main frame section 1100) and the tube body section 2000 are both located in the descending aorta 600, and the openings of the three branches of the aortic arch are located in the branch window 1000a of the frame body section 1000 and are exposed through the branch window 1000a. Then, refer to Figure 6c As shown, a second vascular stent 100 can be introduced through a stent delivery device. At this time, the part of the frame body section 1000 of the second vascular stent 100 far from the tube body section 2000 (i.e., the fenestrated frame section 1200) is located in the aortic arch, the part of the frame body section 1000 close to the tube body section 2000 (i.e., the main frame section 1100) is located in the ascending aorta 500, at the end of the tube body section 2000 close to the heart, and the openings of the three branches of the aortic arch are located in the branch window 1000a of the frame body section 1000 and are exposed through the branch window 1000a.

[0068] The operator can observe and position through the imaging element and adjust the release position of the second vascular stent 100. By adjusting the axial relative position of the first vascular stent 100 and the second vascular stent 100, the overlapping length of the two is adjusted so that the two branch windows 1000a of the two vascular stents 100 are spliced together to form a closed window 100a, and the opening area of the closed window 100a is adjusted to ensure that the three branch vessels above the aortic arch are completely located in the closed window 100a, thereby ensuring sufficient blood supply to the three branch vessels above the aortic arch.

[0069] In the above two embodiments, the tube body segments 2000 of the first vascular stent 100 and the second vascular stent 100 can be located in the ascending aorta 500 or the descending aorta 600 respectively according to the surgical requirements, and the operator can anastomose them with the replaced artificial blood vessel according to the requirements, which is not limited herein.

[0070] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0071] The above-described embodiments merely represent several implementation manners of the present application. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A vascular stent, characterized in that: The vascular stent comprises: A frame body segment, the frame body segment having a frame body cavity penetrating at both ends, a branch window penetrating the frame body cavity is opened on the side wall of the frame body segment, the branch window is located on the side wall of the first end of the frame body segment, and is opened to the end side of the first end of the frame body segment; A tube body segment, wherein the tube body segment has a tube body cavity with two ends connected therethrough, and one end of the tube body segment is connected to the second end of the frame body segment, so that the tube body cavity is connected to the frame body cavity; Wherein, the branch window of the vascular stent is used to be spliced ​​with another matching branch window of the vascular stent to form a closed window.

2. The vascular stent according to claim 1, characterized in that: The vascular stent comprises: A film covering the surface of the frame segment, and the film covering does not cover the branch window; and / or, A developing element is arranged on the surface of the frame segment and is located at the edge of the branch window.

3. The vascular stent according to claim 2, characterized in that: The frame section comprises: Main frame section; A window frame segment, wherein the branch window is opened at the first end of the window frame segment, the first end of the main frame segment is connected to the second end of the window frame segment, the second end of the main frame segment is used to be connected to the end of the tube segment, and the coating body covers the surface of at least one of the main frame segment and the window frame segment.

4. The vascular stent according to claim 1, characterized in that: The branch window has a window shape of at least one of a quadrilateral, a pentagon, a semicircle and a semicircular arc; and / or, The width of the branch window in the circumferential direction of the frame segment is between 10 mm and 20 mm; and / or, The opening length of the branch window in the axial direction of the frame segment is between 40 mm and 50 mm.

5. The vascular stent according to claim 1, characterized in that: The material of the frame section is at least one of nickel-titanium metal and stainless steel; and / or, The diameter of the frame section is between 24 mm and 40 mm; and / or, The diameter of the tube section is between 24 mm and 40 mm; and / or, The length of the tube section is between 5 mm and 10 mm.

6. The vascular stent according to claim 3, characterized in that: The length of the main frame section is between 30 mm and 60 mm.

7. The vascular stent according to claim 1, characterized in that: The frame segment includes a plurality of annular unit frames, and the plurality of annular unit frames are arranged along the axial direction of the frame segment, thereby forming the frame segment.

8. A support system, characterized in that: The stent system comprises at least two vascular stents according to any one of claims 1 to 7.

9. The support system according to claim 8, characterized in that: The vascular stent is a radially deformable variable diameter stent; or, At least two of the plurality of vascular stents have different diameters.

10. The support system according to claim 8, characterized in that: The diameter of at least one of the multiple vascular stents gradually decreases from the first end to the second end of the frame segment, and the diameter of at least one of the vascular stents gradually increases from the first end to the second end of the frame segment.

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