Branched covered stent implantation system

Abstract

The application provides a branched covered stent implantation system, and relates to the field of medical devices, which is composed of a branched covered stent and a branched covered stent implantation device. The branched covered stent comprises a branched framework, a supporting framework and a branched framework covering film. The branched framework and the supporting framework are both elastic frameworks with a cylindrical outer contour. One end of the branched framework in the axial direction is connected to the radial circumferential surface of the supporting framework, and the branched framework covering film is connected to and covers the radial outer circumferential surface of the branched framework. The branched covered stent implantation device is used for implanting the branched covered stent into a branched blood vessel connected to a main aorta in which a main covered stent with a window is implanted. The application solves the problem of how to make the branched covered stent more accurate when released, and how to make the branched covered stent more closely and stably adhere to the main body stent after being released, so that the aortic cavity repair technology can be applied to the cavity treatment of branched blood vessels, thereby achieving the effect of small surgical trauma and high success rate.

Description

Technical Field

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

[0002] Aortic diseases are a group of cardiovascular diseases that seriously threaten human health, including aortic dissection and aortic aneurysm. They are mainly caused by hypertension, arteriosclerosis, injury, and infection, posing a significant threat to patients' lives, especially aortic dissections with extensive lesions affecting the blood supply to the brain, spinal cord, and multiple organs. These dissections are characterized by significant surgical trauma, complex procedures, long duration, high blood usage, and high rates of complications and mortality. Reconstructing the blood supply to the aorta and its branches in the shortest possible time has always been a goal pursued by vascular surgeons. For type B dissections or aneurysms with the tear located in the descending aorta, endovascular aortic repair techniques, which are minimally invasive and have a high success rate, are typically used. Through an incision in the distal aorta, such as the femoral artery, a delivery system loaded with a covered stent is pushed to the lesion site, where the stent is released and fixed, thereby isolating the diseased aneurysm or dissection, reconstructing the blood supply channel, and achieving the therapeutic goal.

[0003] However, when the aortic dissection involves the brachiocephalic trunk, the left common carotid artery, and the aortic arch at the opening of the left subclavian artery, endovascular aortic repair techniques are limited and cannot be effectively used. As a result, surgical methods are still the primary treatment method, which has the problems of large surgical trauma and low success rate.

[0004] These limitations include: when the dissection involves the aortic arch at the openings of the brachiocephalic trunk, left common carotid artery, and left subclavian artery, if endovascular aortic repair is used, a main covered stent with a fenestration needs to be implanted into the aorta first, and then a branch covered stent is implanted into the branch vessels connected to the aorta. At the same time, it is necessary to ensure that the branch covered stent and the main covered stent are tightly connected to the fenestration on the main covered stent to avoid endoleak. However, the branch covered stent in the existing technology is a straight tube, which makes it easy for the portion of the branch covered stent extending into the main covered stent to be too long when the branch covered stent is released within the fenestration of the main covered stent, thereby obstructing the blood flow within the main covered stent. In addition, the connection between the main covered stent and the branch covered stent is a line contact connection, with low anchoring force at the contact point. If the portion of the branch covered stent extending into the main covered stent is too short or has a large angle, endoleak is likely to occur.

[0005] In summary, if we want to apply endovascular aortic repair technology to endovascular treatment involving branch vessels, the urgent problems to be solved are how to make the branch covered stent more precise during deployment, more tightly fitted to the main stent after deployment, and stable in the long term. Summary of the Invention

[0006] The purpose of this invention is to provide a branched covered stent implantation system that solves the problems of how to make the branched covered stent more precise during release, more tightly fitted to the main stent after release, and stable in the long term. This enables the application of endovascular aortic repair technology in endovascular treatment involving branch vessels, thereby achieving the effect of less trauma and higher success rate in this type of surgery.

[0007] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0008] This invention provides a branched covered stent implantation system, comprising a branched covered stent and a branched covered stent implantation device, specifically:

[0009] In a first aspect, embodiments of the present invention provide a branched covered stent, comprising a branched skeleton, a supporting skeleton, and a branched skeleton covered with a membrane;

[0010] Both the branch skeleton and the support skeleton are elastic skeletons with a cylindrical outer contour. One axial end of the branch skeleton is connected to the radial circumferential surface of the support skeleton, and the branch skeleton film is connected to and covers the radial outer circumferential surface of the branch skeleton.

[0011] In an optional embodiment, the branch-coated support further includes a coating patch; the coating patch is connected to the outer circumferential surface of the support frame, and the coating patch is coated and connected to the branch frame, the coating patch being configured to cover the seam formed at the connection between the branch frame and the support frame.

[0012] In an optional embodiment, the overlay patch and the branch skeleton overlay are an integral structure.

[0013] In an optional embodiment, the overlay patch and the branch skeleton overlay are stitched together.

[0014] In an optional embodiment, the branch skeleton and the support skeleton are connected by the film patch.

[0015] In an optional implementation, the branch skeleton and the support skeleton are connected at points.

[0016] In an optional embodiment, a bare support is provided at the end of the branch frame away from the supporting frame.

[0017] In an optional embodiment, the bare stent and the branch skeleton are connected by a film, or the bare stent and the branch skeleton are integrally connected.

[0018] In a second aspect, embodiments of the present invention provide a branch covered stent implantation device for implanting a branch covered stent as described in any of the preceding embodiments into a branch vessel connected to an aorta in which a fenestrated main covered stent has been implanted. The branch covered stent implantation device includes a guide head, a core tube, an intermediate tube, an outer tube, an intermediate tube handle, an outer tube handle, a first pull ring, a second pull ring, a first release wire, a second release wire, a first restraint strap, and a second restraint strap.

[0019] The guide head is fitted and fixedly connected to the proximal end of the core tube, the intermediate tube is fitted and fixedly connected to the outside of the core tube, the outer tube is fitted and slidably connected to the outside of the intermediate tube, the handle of the intermediate tube is connected to the distal end of the intermediate tube, the handle of the outer tube is connected to the distal end of the outer tube, the first pull ring and the second pull ring are located outside the outer tube, the first release wire and the second release wire both pass through the outer tube, the distal end of the first release wire is connected to the first pull ring, and the distal end of the second release wire is connected to the second pull ring;

[0020] In the loaded state, the support frame is mounted between the guide head and the intermediate tube in a manner that fits over the outside of the core tube. The first constraint band is coiled around the outer circumference of the branch frame, and the first release wire passes through the collars at both ends of the first constraint band to retract the branch frame. The second constraint band is coiled around the outer circumference of the support frame, and the second release wire passes through the collars at both ends of the second constraint band to retract the support frame. The proximal end of the second release wire is inserted into the blind hole in the guide head.

[0021] Thirdly, embodiments of the present invention also provide another branch covered stent implantation device for implanting a branch covered stent as described in any of the foregoing embodiments into a branch vessel connected to an aorta implanted with a fenestrated main covered stent, wherein the branch covered stent implantation device includes a guide head, an intermediate tube, an outer tube, an intermediate tube handle, an outer tube handle, and a core wire.

[0022] The outer tube is sleeved on the outside of the middle tube, the handle of the middle tube is connected to the far end of the middle tube, the handle of the outer tube is connected to the far end of the outer tube, the core wire passes through and is fixedly connected to the middle tube, and the guide head is connected to the proximal end of the core wire; a guide wire hole is provided on the guide head.

[0023] In the loaded state, the branched film-coated support is loaded inside the outer tube such that the branch skeleton is radially compressed and the support skeleton is axially compressed, with the support skeleton located near the proximal end of the branch skeleton; the core wire passes through the branch skeleton and the support skeleton.

[0024] The embodiments of the present invention can achieve the following beneficial effects:

[0025] This invention provides a branched covered stent implantation system, comprising a branched covered stent and a branched covered stent implantation device, specifically:

[0026] In a first aspect, embodiments of the present invention provide a branch-coated stent, the branch-coated stent comprising a branch skeleton, a support skeleton, and a branch skeleton coating; both the branch skeleton and the support skeleton are elastic skeletons with a cylindrical outer contour, one axial end of the branch skeleton is connected to the radial circumferential surface of the support skeleton, and the branch skeleton coating is connected to and covers the radial outer circumferential surface of the branch skeleton.

[0027] Taking the application of the branched covered stent provided in this embodiment of the invention to the treatment of aortic dissection as an example, during the surgery, the fenestrated main covered stent is implanted into the aorta. The branched covered stent is then implanted into the branch vessel using a covered stent implantation device, with the supporting skeleton located inside the fenestrated main covered stent and the branch skeleton extending into the branch vessel. Compared to the straight-tube branched covered stents in the prior art, the branched covered stent provided in this embodiment of the invention comprises a branch skeleton and a supporting skeleton. Therefore, under the support and positioning effect of the supporting skeleton, it can avoid the branch skeleton being too long and extending into the fenestrated main covered stent or too short and leaking internally during release. This results in more precise release of the branched covered stent, reduced interference with blood flow in the aortic lumen during implantation, and a tighter and more stable fenestrated fit with the main stent after release. This allows endovascular aortic repair technology to be applied to endovascular treatment involving branch vessels, thereby achieving the effect of minimal trauma and high success rate in such surgeries.

[0028] The second and third aspects of this invention also provide a branch-covered stent implantation device for implanting the aforementioned branch-covered stent into a branch vessel connected to the aorta to which a fenestrated main covered stent has been implanted. The branch-covered stent implantation devices provided in the second and third aspects are simple to operate and convenient to use, which helps to shorten the surgical time when applying endovascular aortic repair technology to endovascular treatment involving branch vessels, and improves the success rate of the surgery. Attached Figure Description

[0029] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0030] Figure 1 A schematic diagram of a fenestrated aortic covered stent implanted in the aorta;

[0031] Figure 2 This is a schematic diagram of the connection structure between the branched film-covered support and the ventilated main film-covered support in the prior art.

[0032] Figure 3 This is a schematic diagram of the overall structure of an optional embodiment of the branched covered stent provided in Embodiment 1 of the present invention;

[0033] Figure 4 This is a schematic diagram of the overall structure of another optional embodiment of the branched covered stent provided in Embodiment 1 of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the branched covered stent implanted at the lesion site according to Embodiment 1 of the present invention;

[0035] Figure 6 This is a schematic diagram of the distal structure of the branched covered stent implantation device provided in Embodiment 2 of the present invention;

[0036] Figure 7 This is a schematic diagram of the proximal structure of the branched covered stent implantation device provided in Embodiment 2 of the present invention;

[0037] Figure 8 This is a schematic diagram of the distal structure of the branched covered stent implantation device provided in Embodiment 3 of the present invention;

[0038] Figure 9 This is a schematic diagram of the proximal structure of the branched covered stent implantation device provided in Embodiment 3 of the present invention;

[0039] Figure 10 This is a schematic diagram of the compression process of the branch-covered stent from the frontal view when the branch-covered stent is implanted using the branch-covered stent implantation device provided in Embodiment 3 of the present invention.

[0040] Figure 11 This is a schematic diagram of the compression process of the branch-covered stent from a side view when the branch-covered stent is implanted using the branch-covered stent implantation device provided in Embodiment 3 of the present invention.

[0041] Figure 12 A schematic diagram of the guidewire implantation steps when implanting a branch-covered stent using the branch-covered stent implantation device provided in Embodiment 3 of the present invention;

[0042] Figure 13 This is a schematic diagram of the branch-covered stent implantation steps when using the branch-covered stent implantation device provided in Embodiment 3 of the present invention.

[0043] Icons: 100-Branch-coated support; 200-Windowed main-coated support; 1-Branch skeleton; 11-Bare support; 2-Support skeleton; 3-Branch skeleton coating; 4-Coated patch; 5-Guide head; 51-Guide wire hole; 510-Guide wire; 6-Core tube; 61-Core wire; 7-Intermediate tube; 71-Intermediate tube handle; 8-Outer tube; 81-Outer tube handle; 91-First pull ring; 92-Second pull ring; 93-First release wire; 94-Second release wire; 101-First restraint band; 102-Second restraint band. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0045] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0046] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0047] In the description of this invention, it should be noted that the terms "upper," "lower," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] In addition, the term "proximal" refers to the end of the instrument that is closer to the body during surgery, while "distal" refers to the end of the instrument that is farther away from the body during surgery.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0051] This invention provides a branched covered stent implantation system, comprising a branched covered stent and a branched covered stent implantation device, specifically:

[0052] Example 1

[0053] This embodiment provides a branched covered stent 100, as shown in the reference. Figure 3 The branch-coated support 100 includes a branch skeleton 1, a support skeleton 2, and a branch skeleton coating 3. Both the branch skeleton 1 and the support skeleton 2 are elastic skeletons with a cylindrical outer contour. One axial end of the branch skeleton 1 is connected to the radial circumferential surface of the support skeleton 2, and the branch skeleton coating 3 is connected to and covers the radial outer circumferential surface of the branch skeleton 1.

[0054] Taking the application of the branched covered stent 100 provided in this embodiment to the surgery for treating aortic dissection as an example, such as Figure 1 As shown, a, b, c, and d represent the aorta, left vertebral artery, left subclavian artery, and aortic dissection, respectively. A fenestrated aortic covered stent 200 is implanted inside the aorta, with the fenestration directly opposite the branch vessel requiring the implantation of the branch covered stent 100—the left subclavian artery. During the surgery, refer to... Figure 5 The branch covered stent 100 was implanted into the branch vessel using a covered stent implantation device, with the supporting framework 2 located inside the fenestrated main covered stent 200 and the branch framework extending into the branch vessel—the left subclavian artery. Figure 2Compared to the existing straight-tube branched covered stent 100, the branched covered stent 100 provided in this embodiment includes two parts: a branch skeleton 1 and a support skeleton 2. Therefore, under the support and positioning function of the support skeleton 2, it can prevent the branch skeleton 1 from being too long and extending into the interior of the fenestrated main covered stent 200 or from being too short and leaking internally during release. This results in more precise release of the branched covered stent, reduced interference of the branched covered stent 100 implantation with blood flow in the aortic lumen, and a tighter and more stable fit with the fenestrated main stent after release. This allows endovascular aortic repair technology to be applied to endovascular treatment involving branch vessels, thereby achieving the effect of minimal surgical trauma and high success rate.

[0055] In this embodiment, the length of the film-covered section of the above-mentioned branch skeleton film 3 can be, but is not limited to, 15mm or 30mm or any length between 15mm and 30mm. The branch skeleton 1 and the support skeleton 2 are preferably made of metal mesh structure.

[0056] Reference Figure 4 In another optional embodiment of this invention, the branch-covered support 100 further includes a covering patch 4. The covering patch 4 is connected to the outer circumferential surface of the support frame 2 and is connected to the branch frame covering 3. The covering patch 4 is configured to cover the seam formed at the connection between the branch frame 1 and the support frame 2. With this structure, the covering patch 4 can be tightly fitted to the main window covering support 200 under the radial support force of the support frame 2, filling the gap between the branch-covered support 100 and the main window covering support 200. This ensures that the connection between the branch-covered support 100 and the main window covering support 200 is a surface contact, which achieves a better effect of preventing internal leakage compared to the line contact in the prior art. The covering patch 4 and the branch frame covering 3 can be an integral structure, or they can be sewn together.

[0057] In this optional embodiment, to make the angle between the branch skeleton 1 and the support skeleton 2 suitable for various angles of human branch blood vessels, it is more preferable that the stent portion of the branch skeleton 1 and the stent portion of the support skeleton 2 are not connected to each other. Instead, the branch skeleton 1 and the support skeleton 2 are connected only by a covering patch 4, so as to more flexibly adjust the angle between the branch skeleton 1 and the support skeleton 2. Of course, in other optional embodiments of this embodiment, the angle between the branch skeleton 1 and the support skeleton 2 can also be adjusted more flexibly by a point connection between them. This point connection includes, but is not limited to, spot welding connections.

[0058] In addition, continue to refer to Figure 4In an optional embodiment of this invention, more preferably, a bare stent 11 is provided at the end of the branch skeleton 1 furthest from the supporting skeleton 2. The bare stent 11 can be connected to the branch skeleton 1 via a covering, or the bare stent 11 can be integrally connected to the branch skeleton 1, or the bare stent 11 and the branch skeleton 1 can be two stent bodies connected by subsequent processing, etc. In this embodiment, by providing the bare stent 11, the bifurcation of the branch vessel can be prevented from being blocked at the distal end of the branch covered stent, while simultaneously increasing the stability of the branch covered stent 100. For example, as... Figure 5 As shown, when the branch covered stent 100 is implanted into the left subclavian artery, the bare stent 11 at the distal end of the branch vessel can not only prevent occlusion of the left vertebral artery, but also increase the stability of the branch covered stent 100 and avoid displacement of the branch covered stent 100 after implantation.

[0059] Example 2

[0060] This embodiment provides a branch covered stent implantation device for implanting a branch covered stent 100 provided in any optional embodiment of Embodiment 1 into a branch vessel connected to the aorta to which a fenestrated main covered stent 200 is implanted.

[0061] Specifically, refer to Figure 6 and Figure 7 The branched covered stent implantation device provided in this embodiment includes a guide head 5, a core tube 6, an intermediate tube 7, an outer tube 8, an intermediate tube handle 71, an outer tube handle 81, a first pull ring 91, a second pull ring 92, a first release wire 93, a second release wire 94, a first restraint band 101, and a second restraint band 102.

[0062] Among them, the guide head 5 is fitted and fixedly connected to the proximal end of the core tube 6, the intermediate tube 7 is fitted and fixedly connected to the outside of the core tube 6, the outer tube 8 is fitted and slidably connected to the outside of the intermediate tube 7, the intermediate tube handle 71 is connected to the distal end of the intermediate tube 7, the outer tube handle 81 is connected to the distal end of the outer tube 8, the first pull ring 91 and the second pull ring 92 are located outside the outer tube 8, the first release wire 93 and the second release wire 94 both pass through the outer tube 8, the distal end of the first release wire 93 is connected to the first pull ring 91, and the distal end of the second release wire 94 is connected to the second pull ring 92. In the loaded state, the support frame 2 is mounted between the guide head 5 and the intermediate tube 7 in a manner that fits over the outside of the core tube 6. The first constraint band 101 is coiled around the outer circumference of the branch frame 1. The first release wire 93 passes through the collars at both ends of the first constraint band 101 to retract the branch frame 1. The second constraint band 102 is coiled around the outer circumference of the support frame 2. The second release wire 94 passes through the collars at both ends of the second constraint band 102 to retract the support frame 2, and the proximal end of the second release wire 94 is inserted into the blind hole on the guide head 5.

[0063] More specifically, in this embodiment, there are various ways in which the first release wire 93 and the second release wire 94 pass through the outer tube 8. For example, but not limited to, the first release wire 93 and the second release wire 94 pass through the gap between the outer wall of the intermediate tube 7 and the inner wall of the outer tube 8. Alternatively, the intermediate tube 7 may have a separate threading cavity that is spaced apart from the core tube cavity. The first release wire 93 and the second release wire 94 may pass through the intermediate tube 7 by passing through the threading cavity to achieve the purpose of passing through the outer tube 8. Alternatively, the first release wire 93 and the second release wire 94 may pass through the outer tube 8 in other ways.

[0064] When implanting a branch covered stent 100 into a branch vessel connected to the aorta with the implanted fenestrated main covered stent 200, the branch covered stent 100 is first loaded into the branch covered stent implantation device according to the loading method described above. Then, the proximal end of the first release wire 93 is inserted into the aorta and exited through the branch vessel. Guided by the guidewire passing through the core tube 6, the branch covered stent implantation device is pushed from the aorta to the branch vessel position. After that, the intermediate tube handle 71 is fixed, and the outer tube 8 is withdrawn through the outer tube handle 81, so that the branch skeleton 1 and the support skeleton 2 are as described above. Figure 7 As shown, a partial release (first-level release) is achieved. Further, by pulling the proximal end of the first release wire 93, the branch skeleton 1 is inserted into the branch vessel. Further, by pulling the first pull ring 91 and the second pull ring 92 in sequence, the first release wire 93 releases the first restraint band 101, and the second release wire 94 releases the second restraint band 102, thereby completely releasing the branch skeleton 1 and the support skeleton 2 (second-level release). Finally, the branch covered stent implantation device can be withdrawn by using the outer tube handle 81 and the middle tube handle 71.

[0065] In this embodiment, the specific materials or winding methods of the first restraint band 101 and the second restraint band 102 are varied. By setting the first restraint band 101 and the second restraint band 102, it is beneficial to reduce the diameter of the branch skeleton 1 and the support skeleton 2 during the implantation process, which facilitates the implantation of the branch covered stent 100 into the branch blood vessel and the precise adjustment of its position before release.

[0066] Example 3

[0067] This embodiment provides another branch covered stent implantation device for implanting a branch covered stent 100 provided in any optional embodiment of Embodiment 1 into a branch vessel connected to the aorta to which a fenestrated main covered stent 200 is implanted.

[0068] Specifically, refer to Figures 8 to 13The branched covered stent implantation device provided in this embodiment includes a guide head 5, an intermediate tube 7, an outer tube 8, an intermediate tube handle 71, an outer tube handle 81, and a core wire 61. The outer tube 8 is sleeved outside the intermediate tube 7, the intermediate tube handle 71 is connected to the distal end of the intermediate tube 7, the outer tube handle 81 is connected to the distal end of the outer tube 8, the core wire 61 passes through and is fixed to the intermediate tube 7, and the guide head 5 is connected to the proximal end of the core wire 61. A guide wire hole 51 is provided on the guide head 5, penetrating the guide head 5. (Refer to...) Figure 9 In the loaded state, the branch-covered support 100 is as follows Figure 10 and Figure 11 The branch skeleton 1 is loaded inside the outer tube 8 in such a way that the support skeleton 2 is compressed radially and the support skeleton 2 is compressed axially, with the support skeleton 2 located near the end of the branch skeleton 1; the core wire 61 passes through the branch skeleton 1 and the support skeleton 2.

[0069] When implanting a branch covered stent 100 into a branch vessel connected to the aorta to which the fenestrated main covered stent 200 has been implanted, first, the branch covered stent 100 is loaded into the branch covered stent implantation device according to the loading method described above, and then... Figure 12 As shown, a guidewire 510 is inserted into the branch vessel, allowing it to pass through the fenestrated main covered stent 200 and then drift proximally towards the proximal end of the aorta. Guided by the guidewire 510, the branch covered stent implantation device is pushed from the branch vessel to the intended release position, as shown. Figure 13 As shown, the guide wire 510 is withdrawn, the intermediate tube handle 71 is fixed, and the outer tube handle 81 is withdrawn at the same time, so that the support frame 2 and the branch frame 1 are released in sequence.

[0070] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments in this specification are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A branched covered stent implantation system, characterized in that, It consists of a branched covered stent and a branched covered stent implantation device, wherein the branched covered stent implantation device includes a guide head (5), an intermediate tube (7), an outer tube (8), an intermediate tube handle (71), an outer tube handle (81), and a core wire (61). The outer tube (8) is sleeved on the outside of the intermediate tube (7), the intermediate tube handle (71) is connected to the far end of the intermediate tube (7), the outer tube handle (81) is connected to the far end of the outer tube (8), the core wire (61) passes through and is fixedly connected to the intermediate tube (7), and the guide head (5) is connected to the proximal end of the core wire (61); a guide wire hole (51) is provided on the guide head (5) to pass through the guide head (5). The branched covered stent (100) includes a branch skeleton (1), a support skeleton (2), and a branch skeleton covering (3). Both the branch skeleton (1) and the support skeleton (2) are elastic skeletons with cylindrical outer contours. One axial end of the branch skeleton (1) is connected to the radial circumferential surface of the support skeleton (2). The branch skeleton film (3) is connected to and covers the radial outer circumferential surface of the branch skeleton (1). In the loaded state, the branch-coated stent (100) is loaded inside the outer tube (8) in such a way that the branch skeleton (1) is radially compressed and the support skeleton (2) is axially compressed, and the support skeleton (2) is located at the proximal end of the branch skeleton (1); the core wire (61) passes through the branch skeleton (1) and the support skeleton (2). When implanting the branch covered stent (100) into a branch vessel connected to the aorta to which the fenestrated main covered stent (200) is implanted, a guide wire (510) is inserted into the branch vessel, so that the guide wire (510) passes through the fenestrated main covered stent (200) and then floats proximally toward the proximal end of the aorta. Under the guidance of the guide wire (510), the branch covered stent implantation device is pushed from the branch vessel to the expected release position, the guide wire (510) is withdrawn, the intermediate tube handle (71) is fixed, and the outer tube handle (81) is withdrawn at the same time, so that the support skeleton (2) and the branch skeleton (1) are released in sequence.

2. The branched covered stent implantation system according to claim 1, characterized in that, The branch-coated support (100) further includes a coating patch (4); the coating patch (4) is connected to the outer circumferential surface of the support frame (2), and the coating patch (4) is connected to the branch frame coating (3), and the coating patch (4) is configured to cover the seam formed at the connection between the branch frame (1) and the support frame (2).

3. The branched covered stent implantation system according to claim 2, characterized in that, The membrane patch (4) and the branch skeleton membrane (3) are an integral structure.

4. The branched covered stent implantation system according to claim 2, characterized in that, The covered patch (4) and the branch skeleton covered patch (3) are sutured together.

5. The branched covered stent implantation system according to any one of claims 2-4, characterized in that, The branch skeleton (1) and the support skeleton (2) are connected by the film patch (4).

6. The branched covered stent implantation system according to any one of claims 1-4, characterized in that, The branch skeleton (1) and the support skeleton (2) are connected by a point.

7. The branched covered stent implantation system according to any one of claims 1-4, characterized in that, A bare bracket (11) is provided at the end of the branch frame (1) away from the support frame (2).

8. The branched covered stent implantation system according to claim 7, characterized in that, The bare stent (11) and the branch skeleton (1) are connected by a film, or the bare stent (11) and the branch skeleton (1) are integrally connected.

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