CN113558709A

CN113558709A - Support anchoring area moves device down

Info

Publication number: CN113558709A
Application number: CN202111104139.7A
Authority: CN
Inventors: 刘颖; 喻晓男; 董永贺
Original assignee: Beijing Huamai Taike Medical Instrument Co ltd
Current assignee: Beijing Huamai Taike Medical Instrument Co ltd
Priority date: 2021-09-22
Filing date: 2021-09-22
Publication date: 2021-10-29
Anticipated expiration: 2041-09-22
Also published as: CN113558709B

Abstract

The invention provides a downward moving device for a bracket anchoring area, which relates to the technical field of medical instruments and comprises an outer layer framework and an inner layer guide piece. Wherein: the outer layer framework is integrally tubular and comprises an expanding section, and the diameter of the expanding section is gradually increased from the near end to the far end; the radial circumferential surface of the expanding section is covered and connected with a coating. The inner guide comprises a proximal guide; the near-end guide part adopts a covered stent or a covered film; the proximal end of the proximal guide is connected with the proximal edge or the proximal inner circumferential surface of the proximal connecting part; the proximal guide member is provided with a first guide cavity. In the implanted state: the outer layer framework penetrates through the tumor cavity, the outer layer framework is fixed inside the tumor cavity through the supporting and fixing part arranged on the outer layer framework, the expanding section is located inside the tumor cavity, and the peripheral surface of the expanding section is attached to the inner surface of the near end of the tumor cavity. The invention at least alleviates the problems of the prior art: when the EVAR technology is used for treating abdominal aortic aneurysm, the technical problems of displacement, Ia type internal leakage and other complications are easy to occur after the covered stent is implanted.

Description

Support anchoring area moves device down

Technical Field

The invention relates to the technical field of medical instruments, in particular to a downward moving device for a stent anchoring area.

Background

At present, in a method for treating abdominal aortic Aneurysm by using an EVAR (Endovascular aortic Aneurysm Repair, EVAR, Endovascular Repair), if a stent anchoring area is insufficient or the Aneurysm diameter angulation is too large, complications such as displacement, type Ia internal leakage and the like are easy to occur after a covered stent is implanted, so that the abdominal aortic Aneurysm continues to be perfused by arterial blood flow, the blood pressure of the Aneurysm vascular wall still needs to be borne, the postoperative effect of the EVAR operation is greatly reduced, and even the EVAR operation fails.

Disclosure of Invention

The invention aims to provide a device for moving down a stent anchoring area, which at least relieves the problems existing in the prior art: when the EVAR technology is used for treating abdominal aortic aneurysm, the technical problems of displacement, Ia type internal leakage and other complications are easy to occur after the covered stent is implanted.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

the embodiment of the invention provides a downward moving device for a bracket anchoring area, which comprises an outer layer framework and an inner layer guide piece;

the outer layer framework is integrally tubular and comprises a near end connecting part, a middle connecting part and a far end connecting part which are sequentially connected from a near end to a far end; the near-end connecting part comprises an expanding section, and the diameter of the expanding section is gradually increased from the near end to the far end; a covering film is covered and connected on the radial circumferential surface of the diameter expansion section;

the inner guide comprises a proximal guide; the near-end guide part adopts a covered stent or a covered film; the near end guide piece is arranged inside the near end connecting part, and the near end of the near end guide piece is connected to the near end edge or the near end inner circumferential surface of the near end connecting part; the near-end guide piece is provided with a first guide cavity which penetrates through the near-end guide piece along the near-end direction to the far-end direction;

in the implanted state: the outer layer framework penetrates through the tumor cavity, the outer layer framework is fixed inside the tumor cavity through the supporting and fixing part arranged on the outer layer framework, the diameter expanding section is located inside the tumor cavity, and the peripheral surface of the diameter expanding section is attached to the inner surface of the near end of the tumor cavity.

In an alternative embodiment, the distal connection portion comprises a reduced diameter section having a diameter that gradually decreases from a proximal end to a distal end; a covering film is covered and connected on the radial circumferential surface of the reducing section; in the implanted state: the reducing section is positioned in the tumor cavity, and the peripheral surface of the reducing section is attached to the inner surface of the far end of the tumor cavity; the support fixing part comprises the expanding section and the reducing section.

Further optionally, the distal connecting portion further comprises a distal extension stent, a proximal end of the distal extension stent being connected to a distal end of the reduced diameter section;

the far-end extension stent is a bare stent, and the far end of the coating connected to the reducing section is connected to the far end face of the reducing section or connected between the near end face and the far end face of the reducing section; or, a covering membrane is covered and connected on the radial circumferential surface of the far-end extension stent, the near end of the covering membrane connected on the far-end extension stent is seamlessly connected with the far end of the covering membrane connected on the reducing section, and the far end of the covering membrane connected on the far-end extension stent is connected with the far-end face of the far-end extension stent or connected between the near-end face and the far-end face of the far-end extension stent.

In an alternative embodiment, the proximal connecting portion further includes a proximal extension bracket, a distal end of the proximal extension bracket is connected to a proximal end of the expanded diameter section, and the support fixing portion includes the proximal extension bracket;

the near-end extension stent is a bare stent, and the near end of a coating film connected to the diameter expanding section is connected to the near-end face of the diameter expanding section or connected between the near-end face and the far-end face of the diameter expanding section; or, a covering membrane is covered and connected on the radial circumferential surface of the near-end extension stent, the far end of the covering membrane connected on the near-end extension stent is seamlessly connected with the near end of the covering membrane connected on the diameter expanding section, and the near end of the covering membrane connected on the near-end extension stent is connected with the near-end surface of the near-end extension stent or connected between the near-end surface and the far-end surface of the near-end extension stent.

Further optionally, barbs are provided on the proximal extension stent.

In an alternative embodiment, the central connecting portion is wrapped with cilia.

In an alternative embodiment, the first guide chamber comprises one or two, two first guide chambers being spaced apart from each other.

In an alternative embodiment, the distal end of the first guide lumen has a flared shape with a diameter that gradually increases from the proximal end to the distal end.

In an alternative embodiment, the inner guide further comprises a distal guide;

the far-end guide piece is arranged inside the far-end connecting part, and the far end of the far-end guide piece is connected to the far-end edge or the far-end inner circumferential surface of the far-end connecting part; the far-end guide part adopts a covered stent or a covered film; the far-end guide part is provided with a second guide cavity which penetrates through the far-end guide part along the near-end direction to the far-end direction;

the distal end of the proximal guide and the proximal end of the distal guide are spaced apart from one another.

Further optionally, the second guiding cavity comprises one or two, and the two second guiding cavities are spaced from each other.

The embodiment of the invention can realize the following beneficial effects:

the embodiment of the invention provides a downward moving device for a bracket anchoring area, which comprises an outer layer framework and an inner layer guide piece; wherein: the outer layer framework is integrally tubular and comprises a near end connecting part, a middle connecting part and a far end connecting part which are sequentially connected from a near end to a far end; the near-end connecting part comprises an expanding section, and the diameter of the expanding section is gradually increased from the near end to the far end; the radial circumferential surface of the expanding section is covered and connected with a film. The inner guide comprises a proximal guide; the near-end guide part adopts a covered stent or a covered film; the near end guide piece is arranged inside the near end connecting part, and the near end of the near end guide piece is connected to the near end edge or the near end inner circumferential surface of the near end connecting part; the near-end guide piece is provided with a first guide cavity which penetrates through the near-end guide piece from the near end to the far end. In the implanted state: the outer layer framework penetrates through the tumor cavity, the outer layer framework is fixed inside the tumor cavity through the supporting and fixing part arranged on the outer layer framework, the expanding section is located inside the tumor cavity, and the peripheral surface of the expanding section is attached to the inner surface of the near end of the tumor cavity.

The use mode of the embodiment of the invention is as follows:

when the stent anchoring area downward moving device is used, the stent anchoring area downward moving device is implanted into an aneurysm cavity of a human body to build an anchoring area for a tectorial membrane stent for treatment, and then the tectorial membrane stent for treatment penetrates through the inner layer guide piece so as to position the tectorial membrane stent for treatment through the stent anchoring area downward moving device.

The stent anchoring area downward moving device provided by the embodiment of the invention adopts a double-layer structure of an outer-layer framework and an inner-layer guide piece, after the stent anchoring area downward moving device is implanted into a tumor cavity, the outer-layer framework of the stent anchoring area downward moving device penetrates through the tumor cavity, the outer-layer framework is fixed inside the tumor cavity by a supporting and fixing part arranged on the outer-layer framework, the outer peripheral surface of an expanding section in the outer-layer framework is attached to the inner surface of the near end of the tumor cavity, and a covering film is covered and connected on the radial circumferential surface of the expanding section, so that the displacement and type Ia internal leakage can be avoided; meanwhile, the inner layer guide piece provides an anchoring area for the near end of the covered stent for treatment and guides the covered stent, and on the other hand, the far end of the near end guide piece in the inner layer guide piece is suspended in the outer layer framework, so that the process of inserting the covered stent cannot interfere with the near end outer layer framework to cause deformation of the outer layer framework, the outer layer framework can better adapt to the tumor shape in the diameter direction and the axial direction, and the occurrence of Ia type internal leakage is further avoided; in addition, the anchoring area that the inlayer guide provided for the tectorial membrane support of treatment for traditional tectorial membrane support's implantation mode, tectorial membrane support's anchoring area has obtained the effect that moves down, can avoid influencing renal artery blood supply, simultaneously, further reduces the risk of Ia type internal leakage.

In summary, the device for moving down the anchoring area of the stent provided by the embodiment of the invention at least relieves the following problems existing in the prior art: when the abdominal aortic aneurysm is treated by the EVAR technology, the technical problems of displacement, Ia type internal leakage and other complications are easy to occur after the stent is implanted; further, it should be noted that: the stent anchoring area downward moving device provided by the embodiment can expand the indication of EVAR for treating abdominal aortic aneurysm, is also suitable for abdominal aortic aneurysm with insufficient infrarenal anchoring area or renal artery involvement, and does not generate displacement and type Ia internal leakage.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view showing that various internal leakages are likely to occur after a covered stent is implanted into an abdominal aortic aneurysm cavity of a human body in the prior art;

FIG. 2 is a schematic view of an alternative embodiment of a stent anchoring zone descender device provided by an embodiment of the present invention implanted into the abdominal aortic aneurysm cavity of a human body;

FIG. 3 is a proximal end view of the proximal guide of the stent anchoring zone descender of FIG. 2;

FIG. 4 is a distal end view of the proximal guide of the stent anchoring zone descender of FIG. 2;

FIG. 5 is a proximal or distal end view of the distal guide element of the stent anchoring zone advancement down device of FIG. 2;

FIG. 6 is a schematic view of the stent graft implanted in the stent anchoring area downshifting device of FIG. 2;

FIG. 7 is a schematic view of the stent graft of FIG. 2 implanted with another stent graft positioned within the downshifting device at the anchoring region of the stent;

FIG. 8 is a schematic view of an alternative embodiment of a stent anchoring region downward-moving device provided by an embodiment of the present invention after being implanted into the thoracic aortic aneurysm cavity of a human body;

FIG. 9 is a schematic view of the stent graft of FIG. 8 implanted within a stent graft downflow device.

Icon: 100-covered stent; 1-outer layer skeleton; 11-a proximal connection; 111-expanding section; 112-a proximal elongate stent; 12-a middle connection; 13-a distal connection; 131-a reducing section; 132-a distal elongate scaffold; 2-inner layer guide; 21-a proximal guide; 211-a first guide lumen; 22-a distal guide; 221-second guide chamber.

Detailed Description

In order to make the objects, 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 with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally laid out when products of the present invention are used, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In particular, in the present invention, the term "proximal" refers to the end closer to the human heart during surgery, and "distal" refers to the end opposite the "proximal".

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, in the existing method for treating abdominal aortic Aneurysm by using EVAR (Endovascular aortic Aneurysm Repair, EVAR, endoluminal Repair), if the anchoring area of the stent is insufficient or the angulation of the Aneurysm diameter is too large, the covered stent is easy to shift and cause complications such as type Ia endoleak after implantation, so that the abdominal aortic Aneurysm continues to be perfused by arterial blood flow, the wall of the Aneurysm vessel still needs to bear blood pressure, the postoperative effect of the EVAR operation is greatly reduced, and even the EVAR operation fails.

In contrast, the present embodiment provides a stent anchoring region downward moving device, which, referring to fig. 2 to 9, includes an outer layer frame 1 and an inner layer guide 2; specifically, the outer layer framework 1 is tubular as a whole and comprises a near end connecting part 11, a middle connecting part 12 and a far end connecting part 13 which are sequentially connected from a near end to a far end; the proximal end connecting part 11 comprises an expanding section 111, and the diameter of the expanding section 111 is gradually increased from the proximal end to the distal end; the radial circumferential surface of the diameter-expanding section 111 is covered and connected with a coating film. The inner guide 2 includes a proximal guide 21; the near-end guide part 21 adopts a covered stent or a covered film; the proximal guide 21 is arranged inside the proximal connecting part 11, and the proximal end of the proximal guide 21 is connected to the proximal edge or the proximal inner circumferential surface of the proximal connecting part 11; the proximal guide 21 is provided with a first guide lumen 211 extending through the proximal guide 21 in the proximal-distal direction. In the implanted state: outer skeleton 1 runs through the tumor chamber, and outer skeleton 1 is fixed in the inside of tumor chamber through the support fixed part of locating outer skeleton 1, and hole enlargement section 111 is located the inside of tumor chamber, and the peripheral face of hole enlargement section 111 pastes in the near-end internal surface of tumor chamber.

The use of this embodiment is as follows:

in use, the stent anchoring area downward moving device is implanted into an aneurysm cavity of a human body as shown in fig. 2 to build an anchoring area for the covered stent 100 for treatment, and then the covered stent 100 for treatment is passed through the inner guide 2 so as to position the covered stent 100 for treatment through the stent anchoring area downward moving device.

Because the stent anchoring area downward moving device provided by the embodiment adopts a double-layer structure of the outer layer framework 1 and the inner layer guide part 2, after the stent anchoring area downward moving device is implanted into a tumor cavity, the outer layer framework 1 of the stent anchoring area downward moving device penetrates through the tumor cavity, the outer layer framework 1 is fixed inside the tumor cavity through the supporting and fixing part arranged on the outer layer framework 1, the outer peripheral surface of the diameter expanding section 111 in the outer layer framework 1 is attached to the inner surface of the near end of the tumor cavity, and the radial peripheral surface of the diameter expanding section 111 is covered and connected with a coating film, so that the displacement and the type Ia internal leakage shown in figure 1 can be avoided; meanwhile, the inner layer guide part 2 provides an anchoring area for the near end of the covered stent 100 for treatment and guides the covered stent 100, and on the other hand, the far end of the near end guide part 21 in the inner layer guide part 2 is suspended in the outer layer framework 1, so that the process of inserting the covered stent 100 cannot interfere with the near end outer layer framework 1 to cause deformation of the outer layer framework 1, the outer layer framework 1 can better adapt to the tumor shape in the diameter direction and the axial direction, and the occurrence of type Ia internal leakage is further avoided; in addition, the inner guide 2 provides the anchoring area of the stent graft 100 for treatment, compared with the conventional stent graft 100, the anchoring area of the stent graft 100 is moved downwards, so that the blood supply of renal arteries can be prevented from being influenced, and meanwhile, the risk of type Ia internal leakage is further reduced.

In summary, the device for moving down the stent anchoring area provided by the embodiment at least alleviates the problems existing in the prior art: when the abdominal aortic aneurysm is treated by the EVAR technology, the technical problems of displacement, Ia type internal leakage and other complications are easy to occur after the stent is implanted; further, it should be noted that: the stent anchoring area downward moving device provided by the embodiment can expand the indication of EVAR for treating abdominal aortic aneurysm, is also suitable for abdominal aortic aneurysm with insufficient infrarenal anchoring area or renal artery involvement, and does not generate displacement and type Ia internal leakage.

In contrast to type Ib endoleaks that may occur during actual surgery if the stent graft 100 has distal end malapposition or iliac aneurysms, as shown in fig. 1, in some alternative embodiments of the present embodiment, referring to fig. 2 and 6-9, the distal junction 13 includes a reduced diameter section 131, and the diameter of the reduced diameter section 131 decreases from the proximal end to the distal end; the radial circumferential surface of the reducing section 131 is covered and connected with a coating film; in the implanted state: the reducing section 131 is positioned in the tumor cavity, and the peripheral surface of the reducing section 131 is attached to the inner surface of the far end of the tumor cavity; the support fixing part comprises an expanding section 111 and a reducing section 131, and the reducing section 131 can prevent Ib type internal leakage on the basis of realizing the function of support fixing.

Further preferably, as shown in fig. 2, 6 and 7, the distal connecting portion 13 further includes a distal extension support 132, and a proximal end of the distal extension support 132 is connected to a distal end of the reduced diameter section 131; further, there are at least several more specific embodiments as follows: in a first alternative embodiment, the distal extension stent 132 is a bare stent, and the distal end of the covering membrane attached to the reduced diameter section 131 is connected to the distal end surface of the reduced diameter section 131 (i.e., the distal end of the covering membrane attached to the reduced diameter section 131 is connected to the proximal intersection of the distal end of the reduced diameter section 131 and the distal extension stent 132); in a second alternative embodiment, the distal extension stent 132 is a bare stent, and the distal end of the covering membrane attached to the reduced diameter section 131 is connected between the proximal end face and the distal end face of the reduced diameter section 131; in a third alternative embodiment, the radially circumferential surface of the distal elongate stent 132 is covered and connected with a covering film, the proximal end of the covering film connected to the distal elongate stent 132 is seamlessly connected with the distal end of the covering film connected to the reduced diameter section 131, and the distal end of the covering film connected to the distal elongate stent 132 is connected with the distal end surface of the distal elongate stent or connected between the proximal end surface and the distal end surface of the distal elongate stent 132.

Furthermore, in some alternative embodiments of this embodiment, as shown in fig. 2 and fig. 6 to 9, the proximal connecting portion 11 further includes a proximal extension bracket 112, a distal end of the proximal extension bracket 112 is connected to a proximal end of the expanded diameter section 111, the support fixing portion includes the proximal extension bracket 112, and a proximal end of the proximal guide 21 is connected to the expanded diameter section 111 or the proximal extension bracket 112; further, there are at least several more specific embodiments as follows: in a first alternative embodiment, the proximal extension stent 112 is a bare stent, and the proximal end of the covering membrane connected to the expanded diameter section 111 is connected to the proximal end surface of the expanded diameter section 111 (i.e., the proximal end of the covering membrane connected to the expanded diameter section 111 is connected to the junction of the proximal end of the expanded diameter section 111 and the distal end of the proximal extension stent 112); in a second alternative embodiment, the proximal extension stent 112 is a bare stent, and the proximal end of the covering membrane connected to the diameter-expanding section 111 is connected between the proximal end surface and the distal end surface of the diameter-expanding section 111; in a third alternative embodiment, a covering membrane is covered and connected on the radial circumferential surface of the proximal extension stent 112, the distal end of the covering membrane connected on the proximal extension stent 112 is seamlessly connected with the proximal end of the covering membrane connected on the diameter-expanding section 111, and the proximal end of the covering membrane connected on the proximal extension stent 112 is connected with the proximal end surface of the proximal extension stent 112 or connected between the proximal end surface and the distal end surface of the proximal extension stent 112.

It is further preferred that the proximal extension stent 112 be provided with barbs (not shown) that are designed to anchor to the inner wall of the vessel, further preventing the stent-anchoring region descender from tilting or shifting within the vessel, and increasing the stability of the stent-anchoring region descender and the stent graft 100 within the stent-anchoring region descender.

In various optional embodiments of this embodiment, the middle connection portion 12 may be a straight tube, or may be a tapered shape as shown in fig. 2, fig. 6 and fig. 7, in which the diameter decreases from the proximal end to the distal end, and then increases, preferably, cilia (not shown) are wound on the middle connection portion 12, the cilia may be made of, but not limited to, polyester yarn, and by setting the cilia, blood embolisms in the tumor body cavity may be accelerated, and in other optional structures, a covering film may be provided on the middle connection portion 12, and the covering film on the middle connection portion 12 and the covering film on other portions of the outer layer skeleton 1 are connected into a whole.

With respect to the proximal guide 21 of the inner guide 2, in some alternative embodiments of this embodiment, the first guide lumen 211 may comprise one as shown in FIGS. 8 and 9, or the first guide lumen 211 may comprise two as shown in FIGS. 2-7, with the two first guide lumens 211 being spaced apart from one another, and selected according to the particular configuration of the stent graft 100 to be implanted, so that the first guide lumen 211 may accommodate a variety of different types of stent grafts (primarily bifurcated stents or two side-by-side small-caliber stent grafts or straight-barrel stents).

To facilitate the guiding of the wire during the operation, in some alternative embodiments of this embodiment, preferably, as shown in fig. 3 and 4, the distal end of the first guide lumen 211 has a flared shape with a diameter gradually increasing from the proximal end to the distal end, and correspondingly, the proximal guide 21 is externally contoured and the distal end can be correspondingly formed with a similar flared shape.

In various alternative embodiments of the present embodiment, as shown in fig. 2 and 6-9, the inner guide 2 further comprises a distal guide 22; specifically, the distal end guide 22 is provided inside the distal end connecting portion 13, and the distal end of the distal end guide 22 is connected to the distal end edge or the distal end inner peripheral surface of the distal end connecting portion 13; the distal guide 22 adopts a covered stent or a covered film; a second guide cavity 221 which penetrates through the distal guide part 22 from the proximal end to the distal end is arranged on the distal guide part 22; and the distal end of proximal guide 21 and the proximal end of distal guide 22 are spaced apart. Through setting up distal end guide 22, can provide the anchor region for the distal end of the tectorial membrane support 100 of treatment usefulness, carry out further direction to tectorial membrane support 100 simultaneously, and because the distal end of near-end guide 21 and the near-end of distal end guide 22 are spaced each other, thereby, the process of inserting tectorial membrane support 100 can not disturb near-end outer skeleton 1 and cause outer skeleton 1 to warp, outer skeleton 1 can be in diameter direction and axial better adaptation tumor body form, the emergence of Ia type internal leakage has further been avoided, combine distal end connecting portion 13 to include the implementation of reducing section 131, the emergence of Ib type internal leakage still can further be avoided.

For this alternative embodiment, in some alternative embodiments of this embodiment, the second guide lumen 221 may comprise one as shown in FIG. 9, or the second guide lumen 221 may comprise two as shown in FIGS. 2-7, and the two second guide lumens 221 may be spaced apart from each other, and may be selected according to the particular configuration of the stent graft 100 that is to be implanted, so that the first guide lumen 211 may accommodate a plurality of different types of stent grafts (a main bifurcated stent graft or two side-by-side small-diameter vessel stent grafts or a straight-tube stent graft).

In particular, as shown in fig. 1, the bifurcated stent graft is prone to type III internal leakage, and for this reason, in a specific application scenario of this embodiment, two side-by-side small-caliber vein stent grafts or straight-tube stent grafts may be preferably used together to avoid the type III internal leakage shown in fig. 1.

Finally, it should be noted that: the embodiments in the present description are all described in a progressive manner, each embodiment focuses on the differences from the other embodiments, and the same and similar parts among the embodiments can be referred to each other; the above embodiments in the present specification are only used for illustrating the technical solutions of the present invention, and not for limiting the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stent anchoring area downward moving device is characterized by comprising an outer layer framework (1) and an inner layer guide piece (2);

the outer layer framework (1) is integrally tubular and comprises a near end connecting part (11), a middle connecting part (12) and a far end connecting part (13) which are sequentially connected from the near end to the far end; the proximal end connecting part (11) comprises an expanding section (111), and the diameter of the expanding section (111) is gradually increased from the proximal end to the distal end; a covering film is covered and connected on the radial circumferential surface of the diameter expanding section (111);

the inner guide (2) comprises a proximal guide (21); the near-end guide piece (21) adopts a covered stent or a covered film; the near end guide (21) is arranged inside the near end connecting part (11), and the near end of the near end guide (21) is connected to the near end edge or the near end inner circumferential surface of the near end connecting part (11); a first guide cavity (211) which penetrates through the near-end guide piece (21) along the near-end direction to the far-end direction is arranged on the near-end guide piece (21);

in the implanted state: the outer layer framework (1) penetrates through the tumor cavity, the outer layer framework (1) is fixed inside the tumor cavity through a supporting and fixing part arranged on the outer layer framework (1), the diameter expanding section (111) is located inside the tumor cavity, and the peripheral surface of the diameter expanding section (111) is attached to the inner surface of the near end of the tumor cavity.

2. The stent anchoring zone downward movement device according to claim 1, wherein the distal connecting portion (13) comprises a reduced diameter section (131), the diameter of the reduced diameter section (131) gradually decreases from the proximal end to the distal end; a covering film is covered and connected on the radial circumferential surface of the reducing section (131); in the implanted state: the reducing section (131) is positioned inside the tumor cavity, and the outer peripheral surface of the reducing section (131) is attached to the inner surface of the far end of the tumor cavity; the support fixing portion includes the expanding section (111) and the reducing section (131).

3. The stent anchoring zone downward movement device according to claim 2,

the distal connecting part (13) further comprises a distal extension bracket (132), the proximal end of the distal extension bracket (132) is connected with the distal end of the reducing section (131);

the distal extension stent (132) is a bare stent, and the distal end of the coating connected to the reduced diameter section (131) is connected to the distal end face of the reduced diameter section (131) or connected between the proximal end face and the distal end face of the reduced diameter section (131); or, a covering membrane is covered and connected on the radial circumferential surface of the far-end prolonged stent (132), the near end of the covering membrane connected to the far-end prolonged stent (132) is seamlessly connected with the far end of the covering membrane connected to the reducing section (131), and the far end of the covering membrane connected to the far-end prolonged stent (132) is connected with the far-end surface of the far-end prolonged stent or connected between the near-end surface and the far-end surface of the far-end prolonged stent (132).

4. The stent anchoring zone downward movement device according to claim 1,

the proximal end connecting part (11) further comprises a proximal end extension bracket (112), the distal end of the proximal end extension bracket (112) is connected with the proximal end of the expanding section (111), and the support fixing part comprises the proximal end extension bracket (112);

the proximal end extension stent (112) is a bare stent, and the proximal end of a coating connected to the diameter expanding section (111) is connected to the proximal end face of the diameter expanding section (111) or connected between the proximal end face and the distal end face of the diameter expanding section (111); or, a covering membrane is covered and connected on the radial circumferential surface of the proximal end extension stent (112), the distal end of the covering membrane connected to the proximal end extension stent (112) is seamlessly connected with the proximal end of the covering membrane connected to the expanding section (111), and the proximal end of the covering membrane connected to the proximal end extension stent (112) is connected with the proximal end face of the proximal end extension stent (112) or connected between the proximal end face and the distal end face of the proximal end extension stent (112).

5. The stent anchoring zone downward movement device according to claim 4,

barbs are arranged on the proximal end extension bracket (112).

6. The stent anchoring zone downward moving device according to claim 1, wherein the middle connecting part (12) is wound with cilia.

7. The stent anchoring zone downward moving device according to claim 1, wherein the first guide lumen (211) comprises one or two, and the two first guide lumens (211) are spaced apart from each other.

8. The stent anchoring zone downward moving device according to claim 1, wherein the distal end of the first guide lumen (211) has a flared shape with a diameter gradually increasing from the proximal end to the distal end.

9. The stent anchoring zone downward movement device according to claim 1,

the inner guide (2) further comprises a distal guide (22);

the far-end guide piece (22) is arranged inside the far-end connecting part (13), and the far end of the far-end guide piece (22) is connected to the far-end edge or the far-end inner circumferential surface of the far-end connecting part (13); the distal guide piece (22) adopts a covered stent or a covered film; a second guide cavity (221) which penetrates through the far-end guide piece (22) along the near-end direction to the far-end direction is formed in the far-end guide piece (22);

the distal end of the proximal guide (21) and the proximal end of the distal guide (22) are spaced apart from each other.

10. The stent anchoring zone downward movement device according to claim 9, wherein the second guide cavity (221) comprises one or two, and the two second guide cavities (221) are spaced apart from each other.