Aortic stent graft and abdominal aortic stent graft assembly

Abstract

The present invention provides an aortic stent graft and an abdominal aortic stent graft assembly, which relates to the field of medical devices, including a main stent graft and an internal assembly; the internal assembly includes a sleeve stent and a pre-placed catheter; the main stent graft, the sleeve stent and the pre-placed catheter are parallel to each other and are sequentially mounted from outside to inside; the side walls of the main stent graft, the sleeve stent and the pre-placed catheter are respectively provided with side wall openings for guide wire superselection; the sleeve stent is fixedly connected to the inner wall of the main stent graft, and the side wall opening of the main stent graft and the side wall opening of the sleeve stent overlap at least partially; the inside of the pre-placed catheter is provided with a mutually isolated guide cavity and an exchange cavity, wherein the guide cavity passes through the two axial end surfaces of the pre-placed catheter, and the exchange cavity passes through one end surface of the pre-placed catheter in the axial direction and the side wall opening of the pre-placed catheter. The present invention at least alleviates the technical problem in the prior art that it is difficult for the guide wire to be selected into the branch vessel when performing intraluminal isolation treatment for aortic branch vessel lesions.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an aortic stent graft and an abdominal aortic stent graft assembly. Background Art

[0002] In the prior art, when the patient's abdominal aortic aneurysm involves the renal artery (perinephric or suprarenal abdominal aortic aneurysm) or the proximal anchoring area is insufficient, parallel stent technology (chimney technology) or main stent fenestration + branch stent technology is often used for intracavitary isolation treatment. Among them, the parallel stent technology (chimney technology) is to implant the covered stent in the renal artery and abdominal aorta at the same time, and the renal artery branch covered stent is squeezed by the main covered stent to fix the renal artery branch covered stent. The main stent fenestration + branch stent technology is to implant the main covered stent in the abdominal aorta, establish a window (opening) at the renal artery position corresponding to the main covered stent, select a guide wire from the window position inside the main covered stent to the renal artery opening, and then implant the renal artery branch covered stent.

[0003] The prior art has the following defects:

[0004] For the parallel stent technology: the main covered stent and the renal artery branch covered stent are not tightly fitted, which is prone to type I endoleak; and the renal artery branch covered stent and the main covered stent need to be implanted into the patient's body at the same time, with the main covered stent released first and the renal artery branch covered stent later, making the surgical operation difficult.

[0005] Regarding the fenestration + branch stent technology: this technology cannot control the direction of the opening of the renal artery branch covered stent located inside the main covered stent. If the opening of this part of the stent cannot be oriented toward the proximal end (the inflow end of the blood flow), it will affect the hemodynamics of the abdominal aorta, and blood cannot be smoothly infused into the renal artery, leading to renal ischemia.

[0006] In addition, whether it is the parallel stent technology or the fenestration + branch stent technology, the guidewire is inserted into the renal artery branch using a combination of the guidewire and the catheter. However, since the size of the abdominal aorta is much larger than the size of the renal artery opening, the catheter has nowhere to rely on in the aortic stent graft, making the guidewire insertion extremely difficult. Summary of the invention

[0007] The object of the present invention is to provide an aortic covered stent and an abdominal aortic covered stent assembly to at least alleviate the technical problem in the prior art that it is difficult to insert a guidewire into a branch vessel during intraluminal isolation treatment of aortic branch vessel lesions (especially abdominal aorta involving renal artery lesions).

[0008] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0009] In a first aspect, an embodiment of the present invention provides an aortic covered stent, comprising a main covered stent and an internal component.

[0010] The built-in component includes a sleeve bracket and a pre-placed catheter; the main body coated bracket, the sleeve bracket and the pre-placed catheter are parallel to each other and are sequentially mounted from the outside to the inside. The side walls of the main body coated bracket, the sleeve bracket and the pre-placed catheter are respectively provided with side wall openings for guide wire superselection. The sleeve bracket is fixedly connected to the inner wall of the main body coated bracket, and the side wall opening of the main body coated bracket overlaps with the side wall opening of the sleeve bracket in at least a partial area. The inside of the pre-placed catheter is provided with a guide cavity and an exchange cavity isolated from each other, wherein the guide cavity passes through the two axial end surfaces of the pre-placed catheter, and the exchange cavity passes through one axial end surface of the pre-placed catheter and the side wall opening of the pre-placed catheter.

[0011] In this embodiment, optionally, the sleeve bracket includes a bracket and a coating connected to the bracket; the bracket includes a proximal bracket and a distal bracket, and the side wall opening of the sleeve bracket is located between the proximal bracket and the distal bracket. The part of the proximal bracket closest to the side wall opening of the sleeve bracket and the part of the distal bracket closest to the side wall opening of the sleeve bracket are the proximal bracket ring and the distal bracket ring, respectively. The proximal bracket ring and the distal bracket ring have the same shape, and respectively include a first arc bracket segment and a second arc bracket segment that are axially symmetrical and have free ends connected end to end, and the proximal bracket ring and the distal bracket ring are symmetrical about the radial plane at the side wall opening of the sleeve bracket, and the contour line of the side wall opening of the sleeve bracket extends along the arc bracket segment where the proximal bracket ring and the distal bracket ring are connected.

[0012] Further optionally, the proximal support also includes a plurality of proximal main support rings that are the same shape as the proximal support ring and are parallel to each other; and / or the distal support ring also includes a plurality of distal main support rings that are the same shape as the distal support ring and are parallel to each other.

[0013] In this embodiment, optionally, the area of ​​the side wall opening region of the sleeve support is smaller than the area of ​​the side wall opening region of the main body coated support.

[0014] Further optionally, projections of the side wall opening area of ​​the sleeve stent on the radial circumferential surface of the main body stent graft are all located inside the side wall opening area of ​​the main body stent graft.

[0015] In this embodiment, optionally, a boss is provided on the side wall of the pre-installed catheter, and the side wall opening of the pre-installed catheter is opened on the boss.

[0016] In this embodiment, optionally, the aortic stent graft further includes a rear release member, which circumferentially constrains the sleeve stent in a releasable manner.

[0017] Further optionally, the rear release member adopts a compression film sleeve with a release wire, the compression film sleeve is point-connected to the sleeve bracket, the release wire circumferentially constrains the compression film sleeve to radially compress the sleeve bracket, and the compression film sleeve is opened by withdrawing the release wire to release the sleeve bracket.

[0018] In a second aspect, an embodiment of the present invention provides an abdominal aortic stent graft assembly, comprising a branch stent graft and the aortic stent graft described in any one of the aforementioned embodiments.

[0019] Wherein, the radially symmetrical two side walls of the main stent graft are respectively provided with side wall openings; the built-in components include at least one group, corresponding to any side wall opening of the main stent graft;

[0020] During delivery, the main covered stent is delivered to the abdominal aorta, and the side wall opening of the main covered stent is aligned with the renal artery opening; the main guidewire is delivered to the proximal direction along the guide cavity of the pre-placed catheter, and the pre-placed catheter and the main guidewire are pushed to the proximal direction at the same time; the main guidewire is captured from the proximal end to pass the pre-placed catheter out from the proximal end; the main guidewire is withdrawn, and the branch guidewire is inserted into the exchange cavity of the pre-placed catheter from the proximal side; the pre-placed catheter and the branch guidewire are pushed to the distal direction, and when the side wall opening of the pre-placed catheter reaches the position of the renal artery opening, the pre-placed catheter is rotated to align the side wall opening of the pre-placed catheter with the renal artery opening, the pre-placed catheter is fixed, and the branch guidewire is continued to be pushed, so that the branch guidewire smoothly enters one side of the renal artery to complete the guidewire superselection of the renal artery on that side; thereafter, the pre-placed catheter is withdrawn, and the renal artery stent delivery device is sent along the branch guidewire to implant the branch covered stent into the renal artery on that side.

[0021] In the abdominal aorta covered stent assembly provided in an embodiment of the present invention, optionally, the built-in components include two groups, and the two groups of built-in components correspond to the two side wall openings of the main covered stent respectively.

[0022] The embodiments of the present invention can achieve at least the following beneficial effects:

[0023] The aortic stent graft provided by the embodiment of the present invention can be used in the treatment of lesions of the aorta involving branch vessels. The aortic stent graft is implanted into the aorta under the guidance of the guidewire, and then another guidewire is accurately and quickly superselected into the branch vessel under the constraint and guidance of the built-in component, and the branch stent graft is implanted along the guidewire. Compared with the prior art, the aortic stent graft can effectively and quickly superselect the branch guidewire into the branch vessel through the combined action of the sleeve stent and the pre-placed catheter in the built-in component, ensuring that the guidewire superselection is more accurate, and the constraint of the sleeve stent can be used to control the proximal opening of the branch stent graft after implantation to face the proximal opening of the aortic stent graft, ensuring good blood perfusion in the branch vessel.

[0024] Since the abdominal aortic stent graft assembly provided in the embodiment of the present invention includes the aortic stent graft provided in the first aspect, the abdominal aortic stent graft assembly provided in the embodiment of the present invention can achieve all the beneficial effects that can be achieved by the aortic stent graft provided in the first aspect.

[0025] In particular, in the embodiments of the present invention, “and / or” indicates that the first feature before “and / or” and the second feature after “and / or” include the following specific setting methods: (1) only the first feature is set, and the second feature is not set; (2) only the second feature is set, and the first feature is not set; (3) the first feature and the second feature are set at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A front view of the overall structure of the aortic stent graft provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic diagram of the matching relationship between the built-in components and the main body of the stent graft at the proximal region of the main body of the aortic stent graft shown;

[0029] Figure 3 A side view of the matching relationship between the sleeve stent and the aortic stent graft in the aortic stent graft provided in an embodiment of the present invention;

[0030] Figure 4 A partial cross-sectional view of the matching relationship between the sleeve stent and the aortic stent graft in the aortic stent graft provided in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the inner cavity structure of a pre-placed catheter of an optional structure in the aortic stent graft provided in an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the inner cavity structure of a pre-placed catheter of another optional structure in the aortic covered stent provided in an embodiment of the present invention;

[0033] Figure 7 A diagram showing the coordination structure of the sleeve stent and the pre-placed catheter in the aortic covered stent provided in an embodiment of the present invention, when the sleeve stent is set with the release member in a circumferentially restrained state;

[0034] Figure 8 Schematic diagram of the implantation steps of the abdominal aorta covered stent assembly provided in an embodiment of the present invention Figure 1 ;

[0035] Fig. 9 Schematic diagram of the implantation steps of the abdominal aorta covered stent assembly provided in an embodiment of the present invention Figure 2 ;

[0036] Fig.10 Schematic diagram of the implantation steps of the abdominal aorta covered stent assembly provided in an embodiment of the present invention Figure 3 ;

[0037] Fig.11 Schematic diagram of the implantation steps of the abdominal aorta covered stent assembly provided in an embodiment of the present invention Figure 4 ;

[0038] Fig.12 A schematic diagram of the final implantation state of the abdominal aorta covered stent assembly provided by an embodiment of the present invention;

[0039] Fig.13 for Fig.12 Schematic diagram of the positional relationship between the branch stent graft and the sleeve stent in the proximal area of ​​the mid-abdominal aorta covered stent assembly.

[0040] Icons: 100-side wall opening; 1-main stent graft; 2-sleeve stent; 21-proximal stent; 211-proximal stent ring; 212-proximal main stent ring; 22-distal stent; 221-distal stent ring; 222-distal main stent ring; 3-pre-placed catheter; 31-guide cavity; 32-exchange cavity; 33-boss; 4-branch stent graft; 51-main guide wire; 52-branch guide wire. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be noted that like reference numerals and letters denote similar items in the drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0044] In the description of the present invention, it should be noted that:

[0045] Unless otherwise clearly specified and limited, the terms "disposed", "installed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] The orientation or positional relationship indicated by the terms "proximal", "distal", "axial", "radial", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or is the orientation or positional relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0047] The terms “first”, “second”, etc. are only used for distinguishing descriptions and do not indicate the total number or relative position in time and / or space, and cannot be understood as indicating or implying relative importance.

[0048] Below, after the stent is implanted in the patient's body, the blood flow inflow end is the proximal end of the stent, and the blood flow outflow end is the distal end of the stent. In conjunction with the accompanying drawings, some embodiments of the present invention are described in detail. In the absence of conflict, the features of the following embodiments and the optional embodiments in the embodiments can be combined with each other.

[0049] Embodiment 1

[0050] This embodiment provides an aortic stent graft, referring to Figures 1 to 5 The aortic stent graft comprises a main stent graft 1 and an internal component. Specifically, the internal component comprises a sleeve support 2 and a pre-placed catheter 3; wherein the main stent graft 1, the sleeve support 2 and the pre-placed catheter 3 are parallel to each other and are sequentially mounted from outside to inside; the side walls of the main stent graft 1, the sleeve support 2 and the pre-placed catheter 3 are respectively provided with side wall openings 100 for guide wire superselection; the sleeve support 2 is fixedly connected to the inner wall of the main stent graft 1, and the side wall opening 100 of the main stent graft 1 and the side wall opening 100 of the sleeve support 2 overlap at least partially; the inside of the pre-placed catheter 3 is provided with a mutually isolated guide cavity 31 and an exchange cavity 32, wherein the guide cavity 31 passes through the two axial end surfaces of the pre-placed catheter 3, and the exchange cavity 32 passes through one end surface of the pre-placed catheter 3 in the axial direction and the side wall opening 100 of the pre-placed catheter 3.

[0051] The aortic stent graft provided in this embodiment can be used in the treatment of lesions of the aorta involving branch vessels. The aortic stent graft is implanted into the aorta under the guidance of a guidewire, and then another guidewire is accurately and quickly superselected into the branch vessel under the constraint and guidance of the built-in component, and the branch stent graft is implanted along the guidewire. Below, taking the application of the aortic stent graft in the treatment of lesions of the abdominal aorta involving the renal artery as an example, the implantation method of the aortic stent graft provided in this embodiment and the functional effects that can be achieved are explained in more detail:

[0052] When implanted, it is combined with the branch stent graft to form an abdominal aorta stent graft assembly. Figures 8 to 13 , the first step, such as Figure 8 As shown, the aortic stent graft is implanted into the abdominal aorta by using a conveyor through femoral artery puncture, so that the side wall opening 100 of the main body stent graft 1 is aligned with the renal artery opening; the second step is as follows Fig. 9 As shown, the main guide wire 51 is delivered along the guide cavity 31 of the pre-placed catheter 3 toward the carotid artery (proximal direction), and the pre-placed catheter 3 and the main guide wire 51 are simultaneously advanced toward the carotid artery (proximal direction); the third step, as shown in FIG. Fig.10 As shown, after carotid artery puncture, the main guide wire 51 is captured by a capturer, the pre-placed catheter 3 is passed through the carotid artery, the main guide wire 51 is withdrawn from the guide cavity 31 of the pre-placed catheter 3, and the branch guide wire 52 is inserted into the exchange cavity 32 of the pre-placed catheter 3 from the proximal side to complete the guide wire exchange; the fourth step, as shown in FIG. Fig.11As shown, the pre-placed catheter 3 and the branch guidewire 52 are pushed in the distal direction. When the side wall opening 100 of the pre-placed catheter 3 reaches the position of the renal artery opening, the pre-placed catheter 3 is rotated to align the side wall opening 100 of the pre-placed catheter 3 with the renal artery opening. The pre-placed catheter 3 is fixed, and the branch guidewire 52 is continued to be pushed so that the branch guidewire 52 smoothly enters one side of the renal artery to complete the guidewire superselection of the renal artery on that side. After that, the pre-placed catheter 3 is withdrawn, and the renal artery stent delivery device is delivered along the branch guidewire 52 to implant the branch covered stent 4 into the renal artery on that side. Repeat the second step and the subsequent operation steps to implant the branch covered stent 4 in the other renal artery. The final implantation state of the abdominal aorta covered stent assembly is shown in FIG. Fig.12 and Fig.13 shown.

[0053] In the above-mentioned operation steps, during the process of the branch guide wire 52 being inserted into the renal artery, the sleeve bracket 2 can constrain the direction of the preset catheter 3 within a certain range. At the same time, the shape control of the exchange cavity 32 of the preset catheter 3 can make the direction of the branch guide wire 52 passing through the exchange cavity 32 approximately perpendicular to the axis of the preset catheter 3, so as to more accurately insert the branch guide wire 52 into the renal artery.

[0054] In summary, compared with the prior art, the aortic covered stent provided in this embodiment can effectively and quickly superselect the branch guidewire into the branch blood vessel through the combined action of the sleeve stent 2 and the pre-placed catheter 3 in the built-in component, ensuring that the guidewire superselection is more accurate, and the constraint of the sleeve stent 2 can be utilized to control the proximal opening of the branch covered stent after implantation to face the proximal opening of the aortic covered stent, ensuring good blood perfusion in the branch blood vessel.

[0055] Continue to refer to Figures 1 to 5 In the aortic stent graft provided in this embodiment, preferably, the sleeve stent 2 includes a stent and a coating connected to the stent; the stent includes a proximal stent 21 and a distal stent 22, and the side wall opening 100 of the sleeve stent 2 is located between the proximal stent 21 and the distal stent 22. The part of the proximal stent 21 closest to the side wall opening 100 of the sleeve stent 2 and the part of the distal stent 22 closest to the side wall opening 100 of the sleeve stent 2 are the proximal stent ring 211 and the distal stent ring 221, respectively. The proximal stent ring 211 and the distal stent ring 221 have the same shape, specifically, refer to Figure 2 and Figure 4The proximal support ring 211 and the distal support ring 221 respectively include a first arc-shaped support segment and a second arc-shaped support segment which are axially symmetrical and whose free ends are connected end to end, that is, the proximal support ring 211 and the distal support ring 221 both form a shape similar to a "fish mouth"; and the proximal support ring 211 and the distal support ring 221 are symmetrical about the radial plane at the side wall opening 100 of the sleeve support 2, that is, the proximal support ring 211 and the distal support ring 221 form a group of "reverse supports" in the axial direction, and the contour line of the side wall opening 100 of the sleeve support 2 extends along the arc-shaped support segment where the proximal support ring 211 and the distal support ring 221 are connected, that is, the proximal support ring 211 and the distal support ring 221 are axially buckled to form a side wall opening 100 similar to a "fish mouth". In this structure, the proximal support ring 211 and the distal support ring 221 are used to provide contour support for the side wall opening 100 of the sleeve support 2 to prevent the side wall opening 100 from being clamped during transportation or under the influence of blood flow, thereby maintaining the side wall opening 100 of the sleeve support 2 always having a large guide wire threading area, further ensuring that the branch guide wire 52 can be quickly superselected.

[0056] In the preferred structure of the above-mentioned sleeve stent 2, it is further preferred that the proximal stent 21 also includes a plurality of proximal main body stent rings 212 that are the same shape as the proximal stent ring 211 and are parallel to each other; and / or the distal stent ring 221 also includes a plurality of distal main body stent rings 222 that are the same shape as the distal stent ring 221 and are parallel to each other. Thus, the sleeve stent 2 is formed into a structure consisting of a plurality of "fish mouth" shaped stent rings and a coating connected to these stent rings. Under this structure, when the sleeve stent 2 is radially compressed, each stent ring can achieve a smaller compression diameter than the traditional Z-shaped stent ring, so as to further reduce the conveying diameter of the conveyor, thereby being more conducive to the conveying of the aortic stent graft by the conveyor, and reducing the damage to the patient's blood vessels during the conveying process.

[0057] In addition, in the aortic stent graft provided in the present embodiment, preferably, the area of ​​the side wall opening 100 of the sleeve stent 2 is smaller than the area of ​​the side wall opening 100 of the main stent graft 1, and further preferably, the projection of the side wall opening 100 of the sleeve stent 2 on the radial circumferential surface of the main stent graft 1 is all located inside the side wall opening 100 of the main stent graft 1. In this way, it can be ensured that the branch guide wire 52 can pass through the side wall opening 100 of the main stent graft 1 as long as it passes through the side wall opening 100 of the sleeve stent 2, avoiding the branch guide wire 52 from passing through the side wall opening 100 of the sleeve stent 2 and facing the peripheral area of ​​the side wall opening 100 of the main stent graft 1 when it is super-selected, further improving the super-selection efficiency of the branch guide wire 52 and not destroying the sealing of the main stent graft 1.

[0058] The stent form of the main stent graft 1 includes but is not limited to a plurality of Z-shaped stent rings, wherein the side wall opening 100 area of ​​the main stent graft 1 is preferably as follows Figure 1 and Figure 3 As shown, for the two Z-shaped stent rings axially close to the side wall opening 100 of the main coated stent 1, the peak height and peak width of the portion close to the side wall opening 100 of at least one Z-shaped stent ring are smaller than the peak height and peak width of other circumferential areas of the Z-shaped stent ring, so as to adapt to the side wall opening 100 without reducing the distance between the two Z-shaped stent rings, thereby ensuring that the main coated stent 1 has a higher radial supporting force.

[0059] Reference Figure 6 In the aortic covered stent provided in this embodiment, optionally and preferably, a boss 33 is provided on the side wall of the pre-set catheter 3, and the side wall opening 100 of the pre-set catheter 3 is opened on the boss 33. This structure can extend the effective length of the exchange cavity 32 of the pre-set catheter 3, so that a part of the boss 33 is selected into the branch blood vessel, thereby enhancing its guiding effect on the branch guide wire 52.

[0060] In addition, refer to Figure 7 In the aortic covered stent provided in this embodiment, optionally and preferably, the aortic covered stent also includes a rear release member, which circumferentially constrains the sleeve stent 2 in a releasable manner. The rear release member has a variety of optional structural forms, including but not limited to using a compression film sleeve with a release wire, the compression film sleeve is point-connected to the sleeve stent 2, the release wire circumferentially constrains the compression film sleeve to radially compress the sleeve stent 2, and the compression film sleeve is opened by withdrawing the release wire to release the sleeve stent 2; or, directly using the binding wire to tie a loose knot to circumferentially wrap the sleeve stent 2, withdrawing the binding wire, and the sleeve stent 2 is released and opened. Before the branch guide wire 52 is selected, the sleeve stent 2 is always in a state of being circumferentially constrained and radially compressed by the rear release member, so as to better play a role in constraining and guiding the pre-placed catheter 3. When the branch guide wire 52 is selected, the rear release member is released to open the sleeve stent 2.

[0061] Embodiment 2

[0062] This embodiment provides an abdominal aorta covered stent assembly, referring to Figures 8 to 13 The abdominal aorta covered stent assembly includes a branch covered stent 4 and an aorta covered stent provided by any optional implementation in Example 1.

[0063] The radially symmetrical two side walls of the main stent graft 1 are respectively provided with side wall openings 100 ; the built-in components include at least one group, corresponding to any side wall opening 100 of the main stent graft 1 .

[0064] During delivery, the main covered stent 1 is delivered to the abdominal aorta, and the side wall opening 100 of the main covered stent 1 is aligned with the renal artery opening; the main guide wire 51 is delivered to the proximal direction along the guide cavity 31 of the pre-placed catheter 3, and the pre-placed catheter 3 and the main guide wire 51 are pushed in the proximal direction at the same time; the main guide wire 51 is captured from the proximal end to pass the pre-placed catheter 3 out from the proximal end; the main guide wire 51 is withdrawn, and the branch guide wire 52 is inserted into the exchange cavity 32 of the pre-placed catheter 3 from the proximal side; the pre-placed guide wire 51 is pushed in the distal direction Tube 3 and branch guidewire 52, when the side wall opening 100 of the pre-placed catheter 3 reaches the opening position of the renal artery, rotate the pre-placed catheter 3 to align the side wall opening 100 of the pre-placed catheter 3 with the renal artery opening, fix the pre-placed catheter 3, and continue to push the branch guidewire 52, so that the branch guidewire 52 smoothly enters one side of the renal artery to complete the guidewire superselection of the renal artery on that side; thereafter, withdraw the pre-placed catheter 3, and deliver it into the renal artery stent delivery device along the branch guidewire 52 to implant the branch covered stent 4 into the renal artery on that side.

[0065] Optionally, the above-mentioned built-in components include two groups, and the two groups of built-in components correspond to the two side wall openings 100 of the main body stent graft 1 respectively.

[0066] The more specific usage and achievable beneficial effects of the abdominal aorta covered stent assembly provided in this embodiment can be obtained by referring to Example 1.

[0067] Finally, it should be noted that the above embodiments and their optional implementation modes in this specification are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned optional implementation modes, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, it is emphasized again that the features of the embodiments in this specification and the optional implementation modes in the embodiments can be combined with each other without conflict.

Claims

1. An aortic stent graft, characterized in that: It comprises a main covered stent (1) and built-in components; The built-in component comprises a sleeve support (2) and a pre-placed catheter (3); The main body stent graft (1), the sleeve support (2) and the pre-placed catheter (3) are parallel to each other and are sequentially mounted from the outside to the inside; the side walls of the main body stent graft (1), the sleeve support (2) and the pre-placed catheter (3) are respectively provided with side wall openings (100) for guide wire superselection; The sleeve support (2) is fixedly connected to the inner wall of the main body coated support (1), and the side wall opening (100) of the main body coated support (1) and the side wall opening (100) of the sleeve support (2) at least partially overlap; The pre-placed catheter (3) is provided with a guide cavity (31) and an exchange cavity (32) which are isolated from each other, wherein the guide cavity (31) passes through both axial end surfaces of the pre-placed catheter (3), and the exchange cavity (32) passes through one axial end surface of the pre-placed catheter (3) and a side wall opening (100) of the pre-placed catheter (3); The sleeve support (2) comprises a support and a coating connected to the support; The support comprises a proximal support (21) and a distal support (22), and the side wall opening (100) of the sleeve support (2) is located between the proximal support (21) and the distal support (22); The portion of the proximal support (21) closest to the side wall opening (100) of the sleeve support (2) and the portion of the distal support (22) closest to the side wall opening (100) of the sleeve support (2) are respectively the proximal support ring (211) and the distal support ring (221); The proximal support ring (211) and the distal support ring (221) are respectively composed of two arc-shaped support segments that are axially symmetrical and whose free ends are connected end to end to form a "fish mouth" shape, and the proximal support ring (211) and the distal support ring (221) are symmetrical about the radial plane at the side wall opening (100) of the sleeve support (2) to form a "reverse support", and the contour line of the side wall opening (100) of the sleeve support (2) extends along the arc-shaped support segment where the proximal support ring (211) and the distal support ring (221) are connected, so that the proximal support ring (211) and the distal support ring (221) are axially buckled to form a "fish mouth" shaped side wall opening (100); The proximal stent (21) further comprises a plurality of proximal main stent rings (212) having the same shape as the proximal stent ring (211) and being parallel to each other; the distal stent ring (221) further comprises a plurality of distal main stent rings (222) having the same shape as the distal stent ring (221) and being parallel to each other; The aortic stent graft further comprises a rear release member, which circumferentially restrains the sleeve stent (2) in a releasable manner.

2. The aortic stent graft according to claim 1, characterized in that: The area of ​​the side wall opening (100) of the sleeve support (2) is smaller than the area of ​​the side wall opening (100) of the main body coated support (1).

3. The aortic stent graft according to claim 2, characterized in that: The projections of the side wall opening (100) region of the sleeve support (2) on the radial circumferential surface of the main coated support (1) are all located inside the side wall opening (100) region of the main coated support (1).

4. The aortic stent graft according to claim 1, characterized in that: A boss (33) is provided on the side wall of the pre-installed catheter (3), and a side wall opening (100) of the pre-installed catheter (3) is opened on the boss (33).

5. The aortic stent graft according to claim 1, characterized in that: The rear release member adopts a compression film sleeve with a release wire, the compression film sleeve is point-connected to the sleeve support (2), the release wire circumferentially constrains the compression film sleeve to radially compress the sleeve support (2), and the compression film sleeve is opened by withdrawing the release wire to release the sleeve support (2).

6. An abdominal aorta stent graft assembly, characterized in that: It comprises a branch stent graft (4) and the aortic stent graft according to any one of claims 1 to 5; The radially symmetrical two side walls of the main stent graft (1) are respectively provided with side wall openings (100); the built-in components include at least one group, corresponding to any side wall opening (100) of the main stent graft (1); During delivery, the main covered stent (1) is delivered to the abdominal aorta, and the side wall opening (100) of the main covered stent (1) is aligned with the renal artery opening; the main guide wire (51) is delivered in the proximal direction along the guide cavity (31) of the pre-placed catheter (3), and the pre-placed catheter (3) and the main guide wire (51) are simultaneously advanced in the proximal direction; the main guide wire (51) is captured from the proximal end to pass through the pre-placed catheter (3) from the proximal end; the main guide wire (51) is withdrawn, and the branch guide wire (52) is inserted into the exchange cavity (32) of the pre-placed catheter (3) from the proximal side; and the pre-placed catheter (3) is advanced in the distal direction. The pre-placed catheter (3) and the branch guide wire (52) are placed. When the side wall opening (100) of the pre-placed catheter (3) reaches the opening position of the renal artery, the pre-placed catheter (3) is rotated so that the side wall opening (100) of the pre-placed catheter (3) is aligned with the opening of the renal artery. The pre-placed catheter (3) is fixed, and the branch guide wire (52) is continuously pushed so that the branch guide wire (52) smoothly enters one side of the renal artery to complete the guide wire superselection of the renal artery on that side. Thereafter, the pre-placed catheter (3) is withdrawn, and the branch guide wire (52) is sent into the renal artery stent delivery device along the branch guide wire (52), and the branch covered stent (4) is implanted into the renal artery on that side.

7. The abdominal aorta stent graft assembly according to claim 6, characterized in that: The built-in components include two groups, and the two groups of built-in components correspond to the two side wall openings (100) of the main body stent graft (1) respectively.

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