CN115300178A - A branched stent-graft - Google Patents

Abstract

The present invention provides a branched stent-graft, which includes a support frame and a membrane, the membrane is attached to the support frame, and the support frame includes a stent support section, a stent diameter-reducing section and a connecting anchor section, and the stent The support section and the connection anchor section are located at both ends of the stent reducing section, the diameter of one end of the stent reducing section connected to the connecting anchor section is smaller than the diameter of the stent support section, and the connecting anchor The diameter of the end of the segment away from the connection with the reduced diameter segment of the stent is larger than the diameter of the support segment of the stent. The present invention has better stabilizing effect on the main body covered stent and self-anchoring effect, can more closely fit the pre-opening hole, complete the sealing, prevent internal leakage, and can avoid the sharp peak angle generated by bending from touching the inner wall of the blood vessel, Scratch blood vessels, thus ensuring their safety.

Description

A branch covered stent

technical field

The invention relates to a medical device, in particular to a branch covered stent.

Background technique

Aortic dissection (Aortic Dissection, AD) refers to a disease in which the intima and media of the aortic lesion are separated. Endovascular aortic repair is a minimally invasive interventional surgery. In the process of repairing aortic dissection, the blood vessel is percutaneously punctured, and a specific delivery device is used to release an artificial tubular prosthesis (ie, covered stent) at the site of the diseased blood vessel, and the artificial prosthesis is used to seal the ruptured blood vessel. Membrane, rebuild new blood channel, isolate the impact of aortic high pressure blood flow on the lesion area, and realize the treatment of aortic dissection. Compared with open surgery, endovascular aortic repair has less trauma, and has better long-term aortic remodeling than conservative treatment.

The structure of the aortic arch is complex, the bifurcation angles of the branch vessels are changeable, and the blood flow is fast. When the dissection involves the supra-arch branch vessels, simple endovascular repair of the aorta may have problems such as obstructing the blood supply of the branch vessels and insufficient anchoring area. With the improvement of medical level and continuous innovation of interventional materials, the development of pre-fenestration and branch stent technology makes it possible to treat aortic arch diseases with endovascular repair. Pre-fenestration technology The pre-opening of the stent-graft and the branch vessel is pre-set to prevent the stent-graft from sealing the branch vessel and hindering the blood supply of the branch vessel. The branch-stent technology implants the branch stent-graft in the pre-opening hole of the stent-graft , Unicom main body covered stent and branch blood vessels to stabilize the anchoring area of the main body covered stent, prevent pre-opening endoleak, reconstruct branch blood vessels, and improve the therapeutic effect of aortic endoluminal repair. And the defective that existing technology exists:

After the traditional branch stent-graft is implanted into the blood vessel, its connection form with the main stent-graft is not good, and the connection is prone to produce gaps, causing blood leakage and endangering the health of patients; after the traditional branch stent-graft is implanted in the blood vessel, due to The bifurcation angles of branch vessels are variable, and branch covered stents cannot adapt to various curved branch vessels. Abnormally curved branch covered stents tend to form acute angles, scratching the inner wall of branch vessels, and endangering the health of patients; and traditional branch covered stents After being implanted into a blood vessel, due to its poor connection with the main stent graft, its stabilization effect on the main stent graft and its own anchoring effect are reduced, and rotation and displacement are prone to occur, endangering the health of patients.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a branch covered stent to solve the poor connection form with the main body covered stent, and the joint is prone to produce gaps, causing blood endoleak; the stabilization effect of the main body covered stent and The anchoring effect of itself is reduced, and it is prone to rotation, displacement, etc.; and the branch covered stent cannot adapt to various curved branch vessels, and abnormally curved branch covered stents are likely to form sharp angles, scratching the inner wall of branch vessels, thus endangering the health of patients The problem.

To achieve the above purpose and other related purposes, the present invention proposes a branched stent graft, comprising a support frame and a film, the film is attached to the support frame,

The support frame includes a bracket support section, a bracket diameter reduction section and a connecting anchor section, the bracket support section and the connection anchor section are located at both ends of the bracket diameter reduction section, and the bracket diameter reduction section is connected to the The diameter of the connecting end of the anchoring section is smaller than the diameter of the supporting section of the stent, and the diameter of the end of the connecting anchoring section away from the connection with the narrowing section of the stent is larger than the diameter of the supporting section of the stent.

In one embodiment of the present invention, the support frame is made of one or several wires twisted and bent, the cross section of which is circular, and any turn of the support frame is wavy.

In one embodiment of the present invention, the support frame includes a plurality of independent metal wire rings arranged in an axial direction, and each independent ring is wavy in the circumferential direction.

In one embodiment of the present invention, the distance between two adjacent turns of the support frame is set between 3mm and 20mm.

In one embodiment of the present invention, the distance between the crests and troughs of each wave shape in the axial direction is set between 3mm and 15mm.

In one embodiment of the present invention, the metal wire has a circular or square cross-section, and the diameter of the circle or the circumscribed circle of the square is set between 0.1 mm and 1 mm.

In one embodiment of the present invention, the diameters of the stent support segments in the axial direction are the same.

In an embodiment of the present invention, the reduced-diameter section of the stent includes a reduced-diameter area and a small-diameter area, and the reduced-diameter area is located between the support section of the stent and the small-diameter area.

In one embodiment of the present invention, the diameter of the diameter reducing area gradually decreases along the direction from the stent support segment to the connecting anchor segment.

In one embodiment of the present invention, the diameter of the small-diameter zone along its axial direction is constant.

In one embodiment of the present invention, the diameter of the small-diameter region decreases gradually along the direction from the stent support segment to the connecting anchor segment.

In one embodiment of the present invention, the supporting frame at the end of the connecting anchoring section away from the narrowing section of the stent is wave-shaped in the circumferential direction.

In one embodiment of the present invention, the covering film is connected along the wavy crest, so that the connection anchoring section is in the shape of a truncated cone, or connected along the wavy metal wire, so that the connection The anchoring segment is petal-shaped.

In one embodiment of the present invention, one end of the connecting anchor section is connected to the reduced-diameter section of the stent, and the other end is folded outward toward the support section of the stent, so that the connecting anchor section has a rounded truncated shape. .

The present invention proposes a branched stent graft. When the branched stent graft is implanted into a curved aortic arch, the connecting anchoring section must have a section with the same diameter as the pre-opening hole, so the connecting anchoring section can be more tightly attached. Combined with pre-opening holes to complete the seal and prevent internal leakage.

The present invention proposes a branch covered stent. The main covered stent is designed with an adjustable round platform on the pre-opened hole. The small ring of the round platform is connected with the pre-opened hole by the covered film and moved in an appropriate amount to adapt to the anatomical structure of different branch vessels. When the branch covered stent of the present invention is used in conjunction with the main body covered stent, the frustum-shaped connection anchoring section and the frustum-shaped adjusting round table are adapted to each other, increasing the contact area, strengthening the sealing effect, and preventing internal leakage.

The present invention proposes a branch film-covered stent. When the adjustment round table of the main body film-covered support can be turned into an inverted round table, when the connecting anchor section in the present invention is adapted to the adjustment round table, a "snapping" can occur, and the connection is more accurate. Stable and better sealing, that is, the contact surface between the conical connecting anchor section of the branch stent-graft and the adjusting circular pedestal is large, the friction is large, the sealing is precise, and even a buckle effect will be produced, which has a great impact on the main body of the stent-graft. The stabilization effect and its own anchoring effect are better.

The present invention proposes a branch covered stent, which has a stent support section and a stent narrowing section, which is supported and anchored in the blood vessel by the stent support section. The sharp peak angle is not easy to touch the inner wall of the blood vessel and scratch the blood vessel, thus ensuring its safety.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that are required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort.

FIG. 1 is a schematic structural view of a branched stent graft in an embodiment of the present invention.

Fig. 2 is a schematic structural view of the axial side of a branched stent graft in an embodiment of the present invention.

FIG. 3 is a schematic structural view of a supporting frame in a branched stent graft in an embodiment of the present invention.

Fig. 4 is a schematic structural view of a supporting frame in a branched stent graft in another embodiment of the present invention.

Fig. 5 is a schematic structural view of a stent support section in a branched stent graft in an embodiment of the present invention.

FIG. 6 is a schematic structural view of a narrowing section of a branched stent graft in an embodiment of the present invention.

FIG. 7 is a schematic diagram of implanting a branched stent graft into a branch vessel in an embodiment of the present invention.

Fig. 8 is a schematic diagram of the structure of the connecting anchoring section in the branched stent graft in an embodiment of the present invention.

Fig. 9 is a schematic structural view of the connecting anchoring section in the branched stent graft in another embodiment of the present invention.

FIG. 10 is a schematic diagram of implanting a branched stent graft into a branch vessel in another embodiment of the present invention.

Label description:

Branch covered stent 1; supporting frame 11; covering film 12; stent supporting section A; stent shrinking section B; connecting anchor section C; proximal end D; ; variable diameter area Ba; small diameter area Bb; branch blood vessel 401 .

Detailed ways

Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

For the convenience of description, the technical terms appearing in the text are explained:

Proximal end: The arterial vessels from the heart gradually branch into capillaries, and then gradually converge into venous vessels to return to the heart. The end of any section of blood vessels that is closest to the heart is called the proximal end.

Distal end: The arterial vessels from the heart gradually branch into capillaries, and then gradually converge into venous vessels to return to the heart. Any section of blood vessels that is far away from the heart is called the distal end.

Axial: Blood vessels, interventional stents, etc. are all in the shape of a round tube. If they are regarded as cylinders, the axis of rotation of the cylinder is defined as the axial direction. In the description of the present invention, unless otherwise specified, the axial direction of the stent-graft refers to the axial direction of the main channel.

Radial: "radial" is perpendicular to "axial", that is, the radius or diameter direction of the end face circle of a cylinder, and the radial direction is perpendicular to the axial space. In the description of the present invention, unless otherwise specified, the radial direction of the stent-graft refers to the radial direction of the main channel.

Circumferential direction: "Circumferential direction" refers to the circumferential direction, which together with "axial" and "radial" constitute three orthogonal directions of cylindrical coordinates. In the description of the present invention, unless otherwise specified, the circumferential direction of the stent graft refers to the circumferential direction of the main channel.

As shown in FIG. 1 , in this embodiment, the present invention proposes a branched stent-graft. FIG. 1 shows an exemplary structural diagram of the branched stent-graft. The branched stent-graft 1 includes a support frame 11 and a covering film 12, the covering film 12 is attached to the supporting frame 11, the supporting frame 11 is the structural frame of the branch stent graft 1, the shape of the supporting frame 11 determines the branch covering film The overall shape of the stent 1, specifically, the branched stent graft 1 includes a stent supporting section A, a stent reducing section B and a connecting anchor section C arranged in sequence, that is, the stent supporting section A and the connecting anchoring section C Located at both ends of the reduced-diameter section B of the stent, the diameter of one end of the reduced-diameter section B of the stent connected to the connecting anchoring section C is smaller than the diameter of the supporting section A of the stent, and the connecting anchoring section C is far away from the connecting anchoring section C. The diameter of one end connected to the narrowing section B of the stent is larger than the diameter of the supporting section A of the stent.

As shown in Figures 1 to 3, in this embodiment, the support frame 11 is made of one or several wires twisted and bent, and its cross section is circular, and any circle of the support frame 11 Specifically, the supporting frame 11 is made of one or several metal wires wound and bent several times on a customized mold, and then heat-treated and shaped, that is, all the wave frames are connected, and the Any ring frame of the support frame 11 is undulating, and the number of crests or troughs of each ring frame is at least three. In this embodiment, the distance h1 between two adjacent frames on the support frame 11 is set between 3mm and 20mm.

As shown in Figure 1, Figure 2 and Figure 4, in some other embodiments, the support frame 11 includes a plurality of independent metal wire rings arranged in the axial direction, and each independent ring is It is wavy upwards, and likewise, the number of crests or troughs of each wavy ring is at least three. Likewise, in this embodiment, the distance between two adjacent independent circular rings on the support frame 11 is set between 3mm and 20mm.

It should be noted that, as shown in Fig. 1 to Fig. 4, in this embodiment, the support frame 11 is made by twisting and bending one or several metal wires or is formed by each of a plurality of independent circular rings. The distance between the wavy crest and the trough in the axial direction is set between 3mm and 15mm. At the same time, the cross-section of the metal wire is circular or square, and the diameter of the circle or the diameter of the circumscribed circle of the square is set at Between 0.1mm and 1mm, for example, the diameter of the metal wire can be 0.1mm, 0.2mm, 0.5mm, 0.6mm, 0.8mm, 1mm, etc. In some other embodiments, the support frame 11 is a cutting bracket, that is, it is made by laser cutting metal pipes, and then made by diameter expansion, eversion, heat treatment and other processes or by 3D metal printing technology.

It should be noted that, as shown in Figures 1 and 2, the covering film 12 is attached to the surface of the supporting frame 11 by sewing or hot-melting, and the covering film 12 is a flexible film, which can be made of polyurethane It is made of materials such as ethyl formate, PET (Polyethyleneterephthalate, polyester fiber, polyester) or EPTFE (expanded, expanded polytetrafluoroethylene).

It should be noted that, as shown in Figures 1 and 2, the membrane 12 is a connecting component of the branch stent-graft 1, and one of its main functions is to connect the support frame 11. Meanwhile, the membrane 12 is made of a flexible material. Manufactured so that the branched stent graft 1 has strong bending performance and flexibility, which can ensure that the branched stent graft 1 can be delivered in curved blood vessels and adapt to the curved structure of the intervening blood vessel.

It should be noted that, as shown in Figures 1 and 2, the covering film 12 also has a sealing function, that is, when the branch covered stent 1 is inserted into the diseased blood vessel, the covering film 12 covers the lesion area, which can not only seal the breach, but also Guaranteed impervious to blood.

For the convenience of explanation, as shown in Fig. 1, Fig. 2 and Fig. 7, the two ends of the branch stent-graft 1 are defined according to the position where the branch stent-graft 1 intervenes in the branch vessel 401, and in the following description, the branch One end of the stent-graft 1 is defined as the proximal end D, and the other end is defined as the distal end E.

As shown in Figures 1 and 5, in this embodiment, the branched stent-graft 1 includes a stent-supporting section A, a stent-diameter-reducing section B, and a connecting anchoring section C arranged in sequence, that is, the branched stent-graft 1 Along the direction from the distal end E to the proximal end D, it is sequentially divided into the stent supporting section A, the stent narrowing section B and the connecting anchor section C, and the branched stent graft 1 is supported by the stent Segment A supports and anchors in the blood vessel, the narrowing section B of the stent is used to avoid scratching the blood vessel due to the sharp peak angle generated by bending, and the connecting anchoring section C is used to cooperate with and connect the stent graft of the main body.

As shown in Fig. 1 and Fig. 5, in this embodiment, the stent support section A is located on one side of the distal end E of the branch stent graft 1, and the stent support section A is axially up and down, etc. diameter, that is, the diameter of the stent support section A is the same, for example, set between 10mm and 20mm, the support frame 11 of the stent support section A can be made by twisting and bending one or several metal wires or by multiple independent Formed in a circular arrangement. When the branched stent graft 1 is delivered into the blood vessel, it is supported and anchored in the blood vessel by the support section A of the stent.

As shown in Fig. 1 and Fig. 5, in this embodiment, the stent supporting section A includes a membrane attachment area Aa and a stent bare area Ab, and the stent bare area Ab is located far from the membrane attachment area Aa. At one end of the narrowing section B of the stent, the film attachment area Aa is formed by part of the surface of the support frame 11 attached to the film 12, and the bare area Ab of the stent is a number of exposed peaks of the distal end E of the support frame 11, and the surface of this area is not attached to the film 12, and the height of the exposed area Ab of the stent is set at, for example, 0.5 mm to 5 mm. The exposed area Ab of the stent can be used in conjunction with a customized delivery system to pull and move the branched stent graft 1 .

As shown in Figure 1 and Figure 6, in this embodiment, the stent diameter reducing section B is located in the middle of the branch covered stent 1, the stent diameter reducing section B changes in diameter up and down in the axial direction, and the There is no exposed area on the surface of the reduced-diameter section B of the stent, and a film 12 is attached to it. The reduced-diameter section B of the stent includes a reduced-diameter area Ba and a small-diameter area Bb, the reduced-diameter area Ba is located between the support section A of the stent and the small-diameter area Bb, and the diameter of the reduced-diameter area Ba in the axial direction The height is set between 5 mm and 10 mm, and the height of the small diameter area Bb in the axial direction is set between 5 mm and 20 mm.

As shown in Fig. 1 and Fig. 6, in this embodiment, the diameter reducing area Ba is located on the side of the stent reducing section B close to the distal end E, and changes in diameter up and down in the axial direction, in the shape of an inverted hollow truncated cone Specifically, the diameter of the diameter-reducing area Ba gradually decreases along the direction in which the stent support segment A points to the connecting anchor segment C, and the diameter-reduction area Ba is far away from the end of the stent support segment A. The diameter is set between 5 mm and 15 mm, that is, the diameter of the variable diameter area Ba gradually decreases along the direction from the distal end E to the proximal end D, and the Ba variable diameter area is close to the distal end E The diameter of one end of the stent is the same as that of the stent support section A, and the diameter of the end of the tapering area Ba close to the proximal end D is set between 5mm and 15mm.

As shown in Figures 1 and 6, in this embodiment, the small-diameter area Bb is located on the side of the narrowing section B of the stent close to the proximal end D, and is equal in diameter up and down in the axial direction or slightly reduced in diameter, and is in the shape of a hollow cylinder or an inverted In particular, the diameter of the small-diameter area Bb along its axial direction is constant, or the diameter of the small-diameter area Bb gradually decreases along the support section A of the stent to the direction of the connecting anchor section C, And the diameter of the small-diameter area Bb away from the variable-diameter area Ba is smaller than the diameter near the end of the variable-diameter area Ba by 1 mm to 2 mm, that is, the diameter of the small-diameter area Bb points along the distal end E to the near The direction of the central end D remains unchanged or gradually decreases; when the upper and lower diameters of the small diameter area Bb are constant, the diameter of the small diameter area Bb is the same as the diameter of the diameter-changing area Ba near the proximal end D; when the small-diameter area Bb changes in diameter up and down , the diameter of the end near the proximal end D of the small diameter area Bb is smaller than the diameter of the end near the distal end E by 1-2 mm. When the branched stent-graft 1 is bent, because the diameter of the reduced-diameter section B of the stent is small, the sharp peak angle generated by the bending is not easy to touch the inner wall of the blood vessel, thereby avoiding scratching the blood vessel.

After the traditional branch stent-graft is implanted into the blood vessel, due to the changeable bifurcation angle of the branch vessel, the branch-covered stent-graft cannot adapt to various curved branch vessels, and the abnormally curved branch-covered stent-graft is easy to form an acute angle and scratch the branch vessel The inner wall, that is, because the traditional branched stent-graft has no stent-reducing section, the overall diameter is equal up and down in the axial direction, and it is hollow cylindrical. When the traditional branched stent-graft is implanted into a curved branch vessel, the traditional branched stent-graft needs to follow When the blood vessel bends, it is easy to produce a sharp peak angle at this time, scratching the inner wall of the blood vessel.

As shown in Figure 7, in this embodiment, the branched stent graft 1 has a stent support section A and a stent narrowing section B, which is supported and anchored in the branch blood vessel 401 by the stent support section A, and when it is bent , due to the small diameter of the narrowing section B of the stent, the sharp peak angle generated by the bending is not easy to touch the inner wall of the blood vessel, so as to avoid scratching the blood vessel.

As shown in Figure 1, in this embodiment, the connecting anchoring section C is located on the side of the branched stent graft 1 close to the proximal end D, and the connecting anchoring section C changes in diameter up and down in the axial direction, and is in the shape of a hollow truncated cone. The diameter of the connecting anchoring section C gradually increases along the direction away from the end connected to the narrowing section B of the stent, and the diameter of the connecting anchoring section C away from the end connecting to the narrowing section B of the stent Set between 10mm and 25mm.

As shown in Figures 1 and 8, in this embodiment, the support frame 11 at the end of the connecting anchor section C away from the narrowing section B of the stent is wave-shaped in the circumferential direction, and the covering film 12 is along the wave shape. Shaped crest connection, so that the connection and anchoring section C is in the shape of a truncated cone, or connected along the wavy metal wire, making the connection and anchoring section C in the shape of a petal.

When the branch stent-graft 1 of the present invention is used in conjunction with the pre-fenestrated main body stent-graft, the matching form is better, and the branch stent-graft described in the present invention has a lower possibility of internal leakage at the junction, specifically Yes, the main body covered stent is designed with an adjustable circular platform on the pre-opened hole, and the small ring of the circular platform is connected with the pre-opened hole by the film, and moves in an appropriate amount to adapt to the anatomical structure of different branch vessels. When the stent is used together with this kind of main body covered stent, the frustum-shaped connection anchoring section and the frustum-shaped adjusting table are compatible with each other, increasing the contact area, strengthening the sealing effect, and preventing internal leakage.

As shown in Figure 9, in some other embodiments, one end of the connecting anchor section C is connected to the narrowing section B of the stent, and the other end is turned outward toward the direction of the support section A of the stent, so that the The connecting anchor segment C is in the shape of a rounded platform.

When used in conjunction with the traditional pre-opened fenestrated stent-graft, the branched stent-graft of the present invention is less likely to leak at the joint. Specifically, the connection anchoring section of the traditional branched stent-graft is similar to " UFO-shaped straight section, when the traditional main body covered stent graft is implanted into the curved aortic arch, the traditional main body covered stent graft will bend with the shape of the blood vessel, when the traditional branch covered stent graft passes through the pre-opened hole, the branch blood vessel will be implanted , and after connecting the traditional main body covered stent, the "flying saucer"-shaped straight anchoring connection section and the curved traditional main body covered stent do not fit well, and small gaps are likely to occur at the edge of the connecting anchor section, causing endoleaks.

As shown in Figures 9 and 10, in this embodiment, after the branched stent graft 1 of the present invention is implanted into the curved aortic arch, the connection and anchoring section of the "inverted round table" type must have a diameter and a predetermined diameter. The hole diameters are the same, so the connecting anchor section can fit the pre-opened hole more closely to complete the seal and prevent internal leakage.

The present invention proposes a branched stent graft. When the branched stent graft is implanted into a curved aortic arch, the connecting anchoring section must have a section with the same diameter as the pre-opening hole, so the connecting anchoring section can be more tightly attached. Combined with pre-opening holes to complete the seal and prevent internal leakage.

The present invention proposes a branch covered stent. The main covered stent is designed with an adjustable round platform on the pre-opened hole. The small ring of the round platform is connected with the pre-opened hole by the covered film and moved in an appropriate amount to adapt to the anatomical structure of different branch vessels. When the branch covered stent of the present invention is used in conjunction with the main body covered stent, the frustum-shaped connection anchoring section and the frustum-shaped adjusting round table are adapted to each other, increasing the contact area, strengthening the sealing effect, and preventing internal leakage.

The present invention proposes a branch film-covered stent. When the adjustment round table of the main body film-covered support can be turned into an inverted round table, when the connecting anchor section in the present invention is adapted to the adjustment round table, a "snapping" can occur, and the connection is more accurate. Stable and better sealing, that is, the contact surface between the conical connecting anchor section of the branch stent-graft and the adjusting circular pedestal is large, the friction is large, the sealing is precise, and even a buckle effect will be produced, which has a great impact on the main body of the stent-graft. The stabilization effect and its own anchoring effect are better.

The present invention proposes a branch covered stent, which has a stent support section and a stent narrowing section, which is supported and anchored in the blood vessel by the stent support section. The sharp peak angle is not easy to touch the inner wall of the blood vessel and scratch the blood vessel, thus ensuring its safety.

The above description is only a preferred embodiment of the application and an explanation of the technical principle used. Those skilled in the art should understand that the scope involved in this application is not limited to the technical solution formed by the specific combination of the above technical features. At the same time, it should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the inventive concept, for example, the above-mentioned features have similar functions to those disclosed in this application (but not limited to) A technical solution formed by replacing each other's technical features.

Except for the technical features described in the specification, the rest of the technical features are known to those skilled in the art. In order to highlight the innovative features of the present invention, the rest of the technical features will not be repeated here.

Claims (14)

1. A branch covered stent, characterized in that it comprises a supporting frame and a covering, and the covering is attached to the supporting frame, The support frame includes a bracket support section, a bracket diameter reduction section and a connecting anchor section, the bracket support section and the connection anchor section are located at both ends of the bracket diameter reduction section, and the bracket diameter reduction section is connected to the The diameter of the connecting end of the anchoring section is smaller than the diameter of the supporting section of the stent, and the diameter of the end of the connecting anchoring section away from the connection with the narrowing section of the stent is larger than the diameter of the supporting section of the stent. 2. The branched stent graft according to claim 1, wherein the support frame is made of one or several metal wires twisted and bent, and its cross section is circular, and any of the support frames The circle is wavy. 3. The branched stent-graft according to claim 1, wherein the support frame comprises a plurality of independent metal wire rings arranged in the axial direction, and each independent ring is formed in the circumferential direction. wavy. 4. The branched stent-graft according to claim 2 or 3, wherein the distance between two adjacent turns of the support frame is set between 3mm and 20mm. 5 . The branched stent graft according to claim 2 or 3 , characterized in that, the distance between each of the wavy peaks and troughs in the axial direction is set between 3 mm and 15 mm. 5 . 6. The branched stent graft according to claim 2 or 3, wherein the cross-section of the metal wire is circular or square, and the diameter of the circle or the diameter of the circumscribed circle of the square is set at 0.1 mm to 1 mm between. 7 . The branched stent graft according to claim 1 , wherein the axial diameters of the support sections of the stent are the same. 8. The branched stent graft according to claim 1, wherein the reduced-diameter section of the stent comprises a reduced-diameter area and a small-diameter area, and the reduced-diameter area is located between the support section of the stent and the small-diameter area . 9 . The branched stent graft according to claim 8 , wherein the diameter of the diameter-changing area decreases gradually along the direction from the support section of the stent to the connecting anchor section. 10 . The branched stent graft according to claim 9 , wherein the diameter of the small diameter area along its axial direction is constant. 11 . 11. The branched stent-graft according to claim 9, wherein the diameter of the small-diameter area decreases gradually along the direction from the support section of the stent to the connecting anchor section. 12 . The branched stent-graft according to claim 1 , wherein the supporting frame at the end of the connection anchoring section away from the narrowing section of the stent is wavy in the circumferential direction. 13 . 13. The branched stent graft according to claim 12, characterized in that, the graft is connected along the wavy crest, so that the connecting anchoring section is in the shape of a truncated cone, or along the wavy shape The metal wires are connected so that the connecting anchor segment is in the shape of a petal. 14. The branched stent graft according to claim 1, wherein one end of the connecting anchor section is connected to the reduced-diameter section of the stent, and the other end is turned outward toward the direction of the support section of the stent, so that The connecting and anchoring section is in the shape of a circular frustum.

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