CN209827101U - Blood vessel stent and embedded branch stent thereof - Google Patents

Abstract

The utility model provides a vascular stent, it includes embedded branch's support to and an at least branch pipe, embedded branch's support includes the main part pipe, the main part pipe includes the main part tectorial membrane, at least one windowing has been seted up on the main part tectorial membrane, embedded branch's support still including set up in an at least embedded bleeder of the inner chamber of main part pipe, at least one embedded bleeder is from at least one windowing court the inner chamber of main part pipe extends, angle between the axis of embedded bleeder and the axis of main part pipe is greater than 0 degree, the near-end of bleeder passes windowing peg graft in embedded branch pipe of embedded branch's support. The utility model also provides an embedded branch support of blood vessel support.

Description

Blood vessel stent and embedded branch stent thereof

Technical Field

The utility model relates to an implantable vascular technical field especially relates to a vascular support with embedded branch's support, and vascular support's embedded branch's support.

Background

Aortic aneurysm refers to the local or diffuse abnormal dilatation of the aortic wall, pressing the surrounding organs to cause symptoms, with the main risk of nodular rupture. It is common to occur in the ascending aortic arch, descending thoracic aorta, thoraco-abdominal aorta and abdominal aorta. Aortic aneurysms can be classified by structure into true aortic aneurysms and false aortic aneurysms. Aortic aneurysm causes pressure increase inside blood vessel, so it is progressively enlarged, if it develops for a long time, finally, it is ruptured, the larger the tumor body, the higher the possibility of rupture. Statistically, 90% of thoracic aortic aneurysms die within 5 years and 3/4 abdominal aortic aneurysms die within 5 years without surgical treatment.

Aortic dissection, which refers to the rupture of the media of the thoracic aorta, the intraluminal bleeding, and the entry of blood between the media and adventitia of the vessel wall, is another serious aortic disease. Due to the impact of the blood flow, once the aortic dissection has been formed, the tear can extend in the direction of the blood flow, the dissection and the false lumen can expand, and the true lumen can be compressed. The risks that may arise for aortic dissection patients therefore include: (1) threatened to complete rupture of the blood vessel, and once the blood vessel is completely ruptured, the death rate is extremely high; (2) the interlayer is gradually enlarged and compresses the true cavity, so that the blood supply of the far end of the blood vessel is reduced. In most cases, aortic dissection is secondary to, or co-present with, a thoracic aortic aneurysm. The oxford angiopathy study in uk showed that the incidence of aortic dissection in the natural population was approximately 6/10 million per year, with more men than women, and an average age of 63 years. The incidence rate of aortic dissection is far higher than that of European and American countries in China, and the incidence age is younger.

The aortic aneurysm diseases may involve branch arteries, and the involvement of the branch arteries can be difficult to solve through an interventional method. At present, arterial cavity treatment is carried out at home and abroad, namely a minimally invasive method is adopted, and a graft, namely an arterial covered stent, is placed into a diseased artery by means of a blood vessel cavity to treat arterial diseases and improve blood supply, so that the treatment aim is fulfilled. The vascular intracavity artery covered stent consists of a tubular rigid wire stent and an artificial blood vessel fixed on the outer side of the stent, wherein the tubular rigid wire stent is formed by folding rigid wires with elasticity into a ring shape through Z-shaped folding, and then a plurality of rings and the artificial blood vessel are sutured or bonded together to form the tubular covered stent. When in use, the tubular covered stent is axially compressed and loaded in a conveyor, the conveyor is used for conveying the tubular covered stent to a diseased artery through a smaller femoral artery, an iliac artery and a brachial artery and then releases the diseased artery, and the diseased artery is automatically restored to a straight tube shape and clings to the inner wall of an aorta under the elastic action of the metal wire stent to isolate the diseased artery from blood flow, thereby achieving the purpose of treatment.

In the prior art, the common stent for artery branch treatment comprises a chimney stent, an integrated multi-branch stent and a windowing stent, the stents are limited by the structure of the stent, and are often customized temporarily or have the problems of internal leakage and the like easily, particularly, for branches with small connection angles, the branch stent often has a large bending angle when connecting a branch blood vessel and a main stent, so that the branch stent is squeezed by the main stent and is blocked.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an embedded branch's support that leaks in can preventing, and be provided with the intravascular stent of embedded branch's support.

In order to solve the technical problem, the utility model provides an embedded branch's support, it includes the main part pipe, the main part pipe includes the main part tectorial membrane, at least one windowing has been seted up on the main part tectorial membrane, embedded branch's support still including set up in an at least embedded bleeder of the inner chamber of main part pipe, at least one embedded bleeder is from at least one windowing court the inner chamber of main part pipe extends, angle between the axis of embedded bleeder and the axis of main part pipe is greater than 0 degree.

The utility model also provides a vascular stent, it includes embedded branch's support to and an at least branch pipe, embedded branch's support includes the main part pipe, the main part pipe includes the main part tectorial membrane, at least one windowing has been seted up on the main part tectorial membrane, embedded branch's support still including set up in an at least embedded bleeder of the inner chamber of main part pipe, at least one embedded bleeder is from at least one windowing court the inner chamber of main part pipe extends, angle between the axis of embedded bleeder and the axis of main part pipe is greater than 0 degree, the near-end of bleeder passes windowing peg graft in embedded branch pipe of embedded branch's support.

The utility model provides an embedded branch's support of blood vessel support include the main part pipe and set up in the at least branch pipe of the inner chamber of main part pipe, the angle between the axis of embedded branch pipe and the axis of main part pipe is greater than 0 degree. When the branch pipe needs to be connected to the embedded branch support, the near end of the branch pipe is inserted into the inner cavity of the embedded branch pipe, and the embedded branch pipe can be wrapped on the outer peripheral surface of the near end of the branch pipe in a sealing mode, so that internal leakage can be effectively prevented, and the branch pipe can be conveniently inserted into the embedded branch support. In addition, since the angle between the axis of the branch pipe fitted in and the axis of the main pipe is larger than 0 degree, the branch pipe is connected to the main pipe in an inclined manner, and the branch pipe can be prevented from being crushed and bent, thereby preventing the branch pipe from being blocked.

Drawings

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

Fig. 1 is a schematic structural view of a vascular stent according to a first embodiment of the present invention.

Fig. 2 is a schematic structural view of the inline branch stent of fig. 1.

Fig. 3 is a schematic perspective view of the ring-shaped wave-shaped support rod in fig. 2.

Fig. 4 is a schematic structural view of the ring-shaped corrugated support rod in fig. 1 connected to the main body coating film.

Fig. 5a-5c are schematic structural diagrams of other forms of the branch-embedded stent of the present invention.

Fig. 6 is an enlarged view of the proximal portion of the inline branch stent of fig. 1.

Fig. 7a and 7b are different structural diagrams of the peripheral development structure of the window opening of the embedded branch bracket of the present invention.

Fig. 8 is a schematic structural view of an embedded branch stent of a vascular stent according to a second embodiment of the present invention.

Fig. 9 is a schematic structural view of an embedded branch stent of a vascular stent according to a third embodiment of the present invention.

Fig. 10 is a schematic structural view of an embedded branch stent of a vascular stent according to a fourth embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.

Furthermore, the following description of the various embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced. Directional phrases used in this disclosure, such as "upper," "lower," "front," "rear," "left," "right," "inner," "outer," "side," and the like, refer only to the orientation of the attached drawing figures and, thus, are used in a better and clearer sense to describe and understand the present invention rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the invention.

In the description of the present invention, the term "proximal" refers to the end near the heart, and the term "distal" refers to the end away from the heart. The utility model discloses in high, low for the main part pipe tectorial membrane, the terminal surface that surpasss the main part pipe tectorial membrane is called high, does not surpass being called low of main part pipe tectorial membrane terminal surface, and this definition is only for the presentation convenience, can not understand as right the utility model discloses a restriction.

Referring to fig. 1, fig. 1 is a schematic structural view of a blood vessel stent according to a first embodiment of the present invention. The utility model provides a blood vessel support 100, it includes an embedded branch support 20 to and at least a branch pipe 40. The embedded branch stent 20 comprises a main body tube 21 and at least one embedded branch tube 25, wherein the main body tube 21 is of an equal-diameter structure or a non-equal-diameter structure. The main body tube 21 comprises a tubular main body covering film 210, and at least one embedded branch tube 25 is arranged in the inner cavity of the main body tube 21 of the embedded branch stent 20. The main body covering film 210 is provided with at least one window 211, and the at least one embedded branch pipe 25 extends from the at least one window 211 to the inner cavity of the main body pipe 21. The angle between the axis of the branch inline pipe 25 and the axis of the main body pipe 21 is greater than 0 degree. The proximal end part of the branch pipe 40 passes through the window 211 and is inserted into the inner cavity of the embedded branch pipe 25 of the embedded branch support 20, and the embedded branch pipe 25 is hermetically sleeved on the proximal end of the embedded branch pipe 25.

In this embodiment, the main tube 21 has a non-constant diameter structure, the diameter of the proximal end of the main tube 21 is larger than that of the distal end, and the diameter of the main tube 21 is gradually reduced from the proximal end to the distal end.

Specifically, the main body covering film 210 is a tubular structure, and the shape of the transverse end face of the main body covering film is a circle, an ellipse or a prism matched with the blood vessel. At least one windowing 211 is arranged on the tubular coating, and the windowing 211 can be a circular hole, an elliptical hole, a prismatic hole or an irregular curved surface and the like. The main body coating 210 is made of polyester fabric, PTFE, PET, or other polymer materials.

The in-line branch stent 20 and the branched tubes 40 are self-expanding stents, and when the in-line branch stent 20 or the branched tubes 40 are delivered through a sheath, the diameter of the in-line branch stent 20 or the branched tubes 40 can be contracted to a smaller state for delivery in the sheath; when the embedded branch stent 20 or the branch tube 40 is released in the blood vessel, the embedded branch stent 20 or the branch tube 40 can be automatically expanded to a desired shape and size so that the embedded branch stent 20 or the branch tube 40 can be supported on the inner wall of the lesion site of the blood vessel, and the embedded branch stent 20 or the branch tube 40 exerts a radial supporting effect on the inner wall of the blood vessel, thereby reconstructing the blood vessel.

The utility model discloses an embedded branch's support 20 of vascular support 100 include a main part pipe 21 and set up in at least branch pipe 40 of the inner chamber of main part pipe 21, the angle between the axis of embedded branch pipe 25 and the axis of main part pipe 21 is greater than 0 degree. When the branch pipe 40 is to be connected to the embedded branch stent 20, the proximal end of the branch pipe 40 is inserted into the inner cavity of the embedded branch stent 25, and the embedded branch stent 25 can sealingly wrap the outer circumferential surface of the proximal end of the branch pipe 40, thereby effectively preventing internal leakage and facilitating the insertion of the branch pipe 40 into the embedded branch stent 20. Further, since the angle between the axis of the branch pipe-in-line 25 and the axis of the main pipe 21 is larger than 0 degree, the branch pipe 40 is connected to the main pipe 21 obliquely, and the branch pipe 40 is prevented from being crushed and bent, thereby preventing the branch pipe 40 from being clogged.

Preferably, an angle between the axis of the branch inline pipe 25 and the axis of the main body pipe 21 is 5 degrees, 45 degrees, or a value in the range of 5 degrees to 45 degrees. Specifically, the branch pipe 25 is connected to the main pipe 21 in an inclined manner in the extended state of the main pipe 21 and the branch pipe 25, that is, the angle between the axis of the branch pipe 25 and the axis of the main pipe 21 is 5 degrees, 45 degrees, or a value in the range of 5 degrees to 45 degrees. When the proximal end portion of the branch pipe 40 is inserted into the branch inline pipe 25, the axis of the proximal end of the branch pipe 40 coincides with the axis of the branch inline pipe 25, so that the branch pipe 40 is connected to the main body pipe 21 obliquely.

In other embodiments, the angle between the axis of the in-line branch pipe 25 and the axis of the main body pipe 21 may be selected to have a suitable value as needed.

The axial extension length of the branch inline pipe 25 is 2mm or more, and preferably, the axial extension length of the branch inline pipe 25 is 2mm, 100mm, or a value in the range of 2mm to 100 mm. The inside diameter of the branch inline pipe 25 is 2mm or more, and preferably, the inside diameter of the branch inline pipe is 2mm, 5mm, or a value in the range of 2mm to 5 mm. The branch pipe 25 serves as an anchoring part for connecting the main body pipe 21 and the branch pipe 40, and the longer the axial extension length of the branch pipe 25 is, the longer the length of the branch pipe 40 sealingly fitted to the branch pipe 25 is, the more stably the proximal end part of the branch pipe 40 is connected to the main body pipe 21, thereby achieving a better leakage prevention effect.

Referring to fig. 2 to 4, fig. 2 is a schematic structural diagram of the embedded branch bracket in fig. 1; FIG. 3 is a perspective view of the ring-shaped wave-shaped support rod of FIG. 2; fig. 4 is a schematic structural view of the ring-shaped corrugated support rod in fig. 1 connected to the main body coating film. The main tube 21 further includes a main body support frame 212 provided on an inner circumferential surface or an outer circumferential surface of the main body coating 210, and specifically, the main body support frame 212 is sewn to the inner circumferential surface or the outer circumferential surface of the main body coating 210 by a suture. The body support skeleton 212 may be a flexible metal support skeleton or a flexible non-metal, such as a polymer, support skeleton. In this embodiment, the main body supporting framework 212 is a nickel alloy stent, and when the main body supporting framework 212 is transported through a sheath, the diameter of the main body supporting framework 212 can be contracted to a smaller state so as to be transported in the sheath; when the body support scaffold 212 is released within the blood vessel, the body support scaffold 212 may automatically expand to a desired shape and size to enable the body support scaffold 212 to be supported on the inner wall of the corresponding blood vessel.

The main body support frame 212 may be formed by laser cutting of a nickel alloy tube or may be formed by weaving a metal wire such as a nickel alloy wire. The density of the mesh structure of the main body support frame 212 is set as required. In this embodiment, the main body supporting framework 212 includes a plurality of Z-shaped or sine-wave shaped annular wave-shaped supporting rods 2120, and the annular wave-shaped supporting rods 2120 are arranged at intervals along the axial direction of the main body covering film 210, that is, the annular wave-shaped supporting rods 2120 are arranged in parallel and at intervals from the proximal end to the distal end of the main body tube 21.

Each of the annular wave-shaped support rods 2120 may be a high-wave support rod or a low-wave support rod, and the high-wave support rod means that the heights of the wave crests and the wave troughs on the annular wave-shaped support rods 2120 are the same, that is, the wave crests and the wave troughs are on the same plane respectively. The high-low wave supporting rods mean that the heights of all wave crests on the annular wave supporting rod 2120 are different, and the heights of all wave troughs can also be different. In this embodiment, the annular corrugated support rods 2120 of the main tube 21 are all equal-height wave support rods.

As shown in fig. 3, each of the Z-shaped or sinusoidal wave forms of each of the ring-shaped wave-form supporting rods 2120 includes a wave peak 2121, a wave trough 2123 and a connecting rod 2125 connected between the wave peak 2121 and the wave trough 2123. Each of the annular wave-shaped support rods 2120 is woven from a superelastic nickel-titanium wire, and the wire diameter (i.e., diameter) of the superelastic nickel-titanium alloy wire is selected to be 0.2 mm-0.55 mm. Each of the annular corrugated supporting rods 2120 is provided with a connecting sleeve 2127, and the connecting sleeve 2127 connects two opposite ends of the annular corrugated supporting rod 2120, that is, two opposite ends of the annular corrugated supporting rod 2120 are accommodated in the connecting sleeve 2127, and then two ends of the nitinol wires are fixed inside the connecting sleeve 2127 by mechanical pressing or welding.

In this embodiment, the annular wavy support rods 2120 are woven by nickel-titanium wires with a diameter of 0.4mm, the number of the Z-shaped or sine waves is 9, and the vertical height of the annular wavy support rods 2120 is 8-15 mm.

In other embodiments, the body support armature 212 may be a woven mesh structure or a cut mesh structure.

In other embodiments, the number of sine waves of the annular waveform supporting rod 2120 may be determined as required, and the vertical height of the annular waveform supporting rod 2120 may be any height.

As shown in fig. 4, each of the annular wave-shaped support rods 2120 of the main body support skeleton 212 is sewn to the main body covering film 210 by stitches 23, i.e., the stitches 23 may follow the wave-shaped course of each of the annular wave-shaped support rods 2120 along the entire main body support skeleton 212. The suture 23 can also be formed by sewing each of the annular wavy support rods 2120 to the main body covering film 210 through a plurality of sewing knots which are distributed at unequal intervals. The diameter of the suture 23 is selected in the range of 0.05mm to 0.25 mm. Or the main body supporting framework 212 can be fixedly connected with the main body covering film 210 in a hot pressing mode.

A transition coating 251 is connected between the embedded branch pipe 25 and the windowing 211, the transition coating 251 is tubular or conical ring-shaped, and the shape of the transverse end surface of the transition coating 251 corresponds to that of the windowing 211, namely the transition coating can be circular, oval or prismatic. The transitional coating 251 extends from the fenestration 211 toward the lumen of the main tube 21. One end of the transition coating 251 is connected to the edge of the window 211 in a sealing manner, and the other end of the transition coating 251 is connected to the proximal end of the embedded branch pipe 25 in a sealing manner. Specifically, the proximal edge of the transition membrane 251 is sealingly connected to the edge of the main body membrane 210 at the fenestration 211, the distal edge of the transition membrane 251 is sealingly connected to the proximal circumference of the branched inline pipe 25, and the proximal outer diameter of the transition membrane 251 is larger than the distal outer diameter. The transition covering film 251 is made of polyester fabric, PTFE, PET or other high polymer materials. Because the transition covering film 251 is connected between the embedded branch 25 and the windowing 211, the transition covering film 251 can be connected between the main body covering film 210 and the embedded branch 25 in a sealing way, and therefore, the main body covering film 210 can prevent the embedded branch 25 from leaking inwards from the windowing 211.

In another embodiment, the outer diameter of the distal end of the transition coating 251 is larger than the outer diameter of the proximal end, so that the transition coating forms an internal recess, which has a guiding effect. Or the cross section of the distal end of the transition coating 251 is recessed relative to the fenestration to form a guide portion, so that the connection between the branch pipe 40 and the embedded branch pipe 25 is smoother.

In this embodiment, the proximal end of the transition membrane 251 is sutured to the main body membrane 210 at the edge of the fenestration 211 by a suture, and the distal end of the transition membrane 251 is sutured to the proximal end of the embedded branch pipe 25 by a suture. The distal end of the transitional covering film 251 and the proximal end of the in-line branch pipe 25 can be of an integral structure.

In other embodiments, the connection between the proximal end of the transition covering film 251 and the main covering film 210 can be connected by medical glue, and the connection between the distal end of the transition covering film 251 and the in-line branch pipe 25 can also be connected by medical glue.

In other embodiments, a support skeleton may be further disposed on the transition covering film 251 to support the transition covering film 251. The supporting frame may be sewn to the inner or outer circumferential surface of the transition coating 251 by sewing.

The embedded branch 25 includes a tubular embedded branch coating 253 and a support framework 255 disposed on the embedded branch coating 253, that is, the embedded branch coating 253 is attached to the inner circumferential surface or the outer circumferential surface of the support framework 255. Specifically, the supporting frame 255 is fixed on the inner circumferential surface or the outer circumferential surface of the embedded branch coating 253 or between the plurality of coatings by sewing or hot pressing. The lateral end faces of the embedded branched membranes 253 are shaped as circles, ovals or prisms that fit the proximal ends of the branched tubes 40, and the proximal ends of the embedded branched membranes 253 are connected to the distal ends of the transitional membranes 251. The distal end of the embedded branch coating 253 extends towards the inner cavity of the main tube 21. In the extended state, the angle between the axis of the embedded branch coating 253 and the axis of the main pipe 21 is greater than 0 degree. The main body coating 210 is made of polyester fabric, PTFE, PET, or other polymer materials.

The support backbone 255 may be a flexible metal support backbone or a flexible non-metal support backbone such as a polymer material. In this embodiment, the supporting framework 255 is a nickel alloy stent, and when the supporting framework 255 is transported through the sheath, the diameter of the supporting framework 255 can be contracted to a smaller state so as to be transported in the sheath; when the support armature 255 is released, the support armature 255 may automatically expand to the desired shape dimension. The supporting framework 255 can support the embedded branch coating 253, so that the embedded branch coating 253 is kept in an open state, and the connection of the branch pipes 40 is facilitated.

The support frame 255 may be laser cut from a nickel alloy tube or may be woven from a metal wire such as a nickel alloy wire. The density of the mesh structure of the supporting frame 255 is set as necessary. In this embodiment, the supporting framework 255 includes a plurality of Z-shaped or sine-wave shaped annular waveform supporting rods, and the annular waveform supporting rods are arranged at intervals along the axial direction of the embedded branch coating 253, that is, the annular waveform supporting rods are sequentially arranged in parallel and at intervals from the proximal end to the distal end of the embedded branch coating 253.

The inner diameter of the embedded branch 25 is smaller than or equal to the outer diameter of the proximal end of the branch pipe 40, and when the proximal end portion of the branch pipe 40 is inserted into the embedded branch 25 through the window 211 and released, the support frame 255 presses the outer wall of the branch pipe 40, so that the connection between the branch pipe 40 and the embedded branch 25 is firmer, and the shape of the branch pipe 40 entering the embedded branch 25 can be maintained; the embedded branch coating 253 is wrapped on the outer peripheral surface of the proximal end of the branch pipe 40, so that internal leakage can be further prevented.

Referring to fig. 5a to 5c, fig. 5a to 5c are schematic structural views of other forms of the branch pipe embedded in the branch stent of the present invention. The supporting framework 255 of the embedded branch 25 can be selected from any one of the ring-shaped supporting frames shown in fig. 5a and 5b or the net-shaped framework shown in fig. 5 c. The annular support frame comprises a plurality of Z-shaped or sine-wave shaped annular waveform support rods which are arranged at intervals along the axial direction of the embedded branch 25. The mesh skeleton can be made by weaving or cutting.

In other embodiments, the embedded branch 25 includes only the embedded branch overlay 253, i.e., the support backbone 255 on the embedded branch overlay 253 may be omitted, with the proximal end of the embedded branch overlay 253 connected to the distal end of the transition overlay 251.

In other embodiments, the embedded branch 25 comprises only the supporting skeleton 255, i.e., the embedded branch covering 253 on the supporting skeleton 255 can be omitted, and the supporting skeleton 255 is a bare stent which can be a braided or cut structure bare stent. The proximal end of the bare stent is attached to the distal end of the transitional covering membrane 251.

In other embodiments, the in-line branch tube 25 includes an in-line branch coating 253 directly connected to the fenestration 211, the in-line branch coating 253 being sealingly connected to the main body coating 210 outside of the fenestration 211, the in-line branch coating 253 being used to wrap the proximal end of the branch tube 40. Specifically, the transition coating 251 between the branch inline pipe 25 and the fenestration 211 may be omitted, and directly and hermetically connected to the edge of the main body coating 210 on the fenestration 211 through the proximal end of the branch inline coating 253. The embedded branch coating 253 is of a tubular structure, and the shape of the transverse end face of the embedded branch coating 253 is consistent with that of the window 211, specifically, circular, oval or prismatic. The embedded branch coating 253 may be provided with an elastic embedded branch skeleton, and the embedded branch skeleton is attached to an inner circumferential surface or an outer circumferential surface of the embedded branch coating 253. The embedded branch skeleton can make the connection of the branch pipe 40 connected to the embedded branch pipe 25 more firm and can maintain the shape of the branch pipe 40 entering the embedded branch 25. In other embodiments, the embedded branch skeleton on the embedded branch overlay 253 may be omitted.

As shown in fig. 6, a support 214 is disposed at an edge of the window 211, and the support 214 is used for spreading the window 211 to keep the window 211 open. The support piece 214 is fixed in the bracing piece at windowing 211 edge, the bracing piece is followed the edge extension of windowing 211, the bracing piece adapts to the marginal shape of windowing 211, specifically, the bracing piece can be circular, oval or prismatic annular structure.

Preferably, the support 214 is a support ring extending along an edge of the window 211, and the support ring has elasticity. When the branch pipe 40 is connected to the window 211, the support ring can be closely attached to the outer surface of the branch pipe 40 to prevent the branch pipe 40 from leaking into the junction with the main pipe 21. The support member 214 is made of a memory alloy, preferably nitinol.

In this embodiment, the main body coating 210 is provided with a developing structure 215 around the window 211, and the developing structure 215 is a plurality of developing points continuously or discontinuously arranged on the main body coating 210 along the edge of the window 211. These development sites may be fixed to the main body cover film 210 by sewing, punching, setting, or attaching. These development dots are provided at least one turn along the peripheral edge of the window 211. The material of the development structure 215 may be made of a material that is opaque to X-rays, highly corrosion resistant, and biocompatible. The developer material includes, but is not limited to, gold, platinum, tantalum, osmium, rhenium, tungsten, iridium, rhodium, or alloys or composites of these metals. In this embodiment, the development sites are nickel-titanium alloy metal sheets containing tantalum. The ring shape enclosed by these visualization points is consistent with the shape of the window 211, therefore, these visualization points enclose a connected or disconnected ring-shaped visualization mechanism, and the position of the visualization structure 215 can be clearly observed through the imaging device during the operation, i.e., the visualization point near the window 211 is observed as a ring-shaped visualization mechanism surrounding the edge of the window 211, therefore, the insertion of the proximal end of the branch pipe 40 into the embedded branch 25 is more convenient and faster.

In other embodiments, as shown in fig. 7a, the developing structure 215 is a developing wire continuously or intermittently wound on the supporting member 214. The developing wire can adopt a nickel-titanium alloy wire containing tantalum, and the diameter of the nickel-titanium alloy wire is 0.10-0.40 mm. Since the developing structure 215 has developing property and is annular, the position of the developing structure 215 can be clearly observed by an imaging device in the operation process, that is, it can be observed that the developing structure 215 is an annular developing structure surrounding the edge of the window 211, rather than scattered developing points, and therefore, the branch pipe 40 can be inserted into the embedded branch 25 more conveniently and quickly.

In other embodiments, as shown in fig. 7b, the developing structure 215 is a developing point continuously or intermittently fixed on the supporting member 214, and the developing point is fixed on the supporting member 214 by sewing, punching, hot pressing, embedding, or attaching. These development sites are arranged at least one turn around the support 214.

In other embodiments, the support 214 is made of an alloy doped with a developer material, and the developer structure 215 is a developer material fused within the support 214. The supporting part 214 is surrounded by nickel-titanium alloy wires containing tantalum, and the wire diameter of the supporting part 214 is 0.10-0.40 mm. Since the supporter 214 is made of an alloy containing a developing material, the supporter 214 can be directly used as a developing structure without being additionally disposed on the supporter 214. The position of the supporting member 214 can be clearly observed by the imaging device during the operation, and the branch tube 40 can be conveniently and quickly inserted into the window 211, which is convenient to use.

In other embodiments, at least one round of nitinol wire may be embedded in the outer surface of the support member 214, or at least one round of nitinol wire may be adhered to the outer surface of the support member 214. Preferably, the support 214 is wrapped with tantalum wire.

Please refer to fig. 8, fig. 8 is a schematic structural diagram of an embedded branch bracket according to a second embodiment of the present invention. The utility model discloses the structure of the embedded branch support that the second embodiment provided is similar with the structure of first embodiment, and the difference lies in: in the second embodiment, a support ring 256 is disposed at the proximal and/or distal nozzle of the branch embedded pipe 25, and the support ring 256 is used to open the branch embedded film 253, so that the branch embedded film 253 maintains the expanded state and facilitates the insertion of the branch pipe 40. The support ring 256 extends along the edge of the opening at the proximal or distal end of the embedded branched membrane 253, and the support ring 256 is adapted to the edge shape of the cross section of the embedded branched pipe 25, and specifically, the support ring 256 may be circular, oval or prismatic. The support ring 256 has elasticity, and when the branched pipe 40 needs to be connected in the window 211, the support ring 256 can be tightly attached to the outer surface of the branched pipe 40, so as to prevent the junction of the branched pipe 40 and the embedded branched pipe 25 from leaking inwards. The support ring 256 is made of a memory alloy, preferably nitinol.

The proximal end and/or distal end of the branch embedded pipe 25 is provided with an annular developing part, and the annular developing part is arranged at least one circle around the circumference of the branch embedded pipe 25. The annular developing portion may be provided at the edge of the opening of the proximal end and/or the distal end of the embedded branch coating 253, or the annular developing portion may be provided at the support ring 256 of the embedded branch pipe 25. The annular developing portion is disposed on the supporting ring 256, which includes, but is not limited to, the following: a developing wire, such as a nitinol wire containing tantalum, having a diameter of 0.10-0.40mm, is attached to or intermittently wound around each support ring 256; since the developing wire on the support ring 256 has developing properties and is annular, an annular developing portion is formed; the position of the visualization filament on the support ring 256 can be clearly observed by the imaging device during the operation to facilitate and facilitate the insertion of the branch tube 40 into the embedded branch 25. Next, developing points are continuously or intermittently fixed on each support ring 256, the developing points surround an annular developing portion, and the developing points are fixed on the support rings 256 by sewing, punching, hot pressing, embedding, or attaching. Alternatively, each support ring 256 may be formed from an alloy doped with a developer material, such as a nitinol wire containing tantalum, such that the support ring 256 itself forms the annular developer portion.

Please refer to fig. 9, fig. 9 is a schematic structural diagram of an embedded branch bracket according to a third embodiment of the present invention. The utility model discloses the structure of the embedded branch support that the third embodiment provided is similar with the structure of first embodiment, and the difference lies in: in the third embodiment, the main body supporting framework 212 of the main body tube 21 is provided with a support part 2122 with a small wave shape at the proximal end and/or the distal end of the window 211, and the support part 2122 is used for better expanding the window 211.

Specifically, the supporting portion 2122 is disposed on the wave crest and/or the wave trough of the annular wave-shaped supporting rod 2120 adjacent to the window 211, so that the supporting portion 2122 is located at the proximal end and/or the distal end of the window 211. When the supporting portion 2122 is disposed on the wave peak of the annular wave-shaped supporting rod 2120, the supporting portion 2122 includes a wave trough 2124 adjacent to the edge of the window 211, connecting rods 2128 at two ends opposite to the wave trough 2124, and a wave peak 2126 connected to one end of each connecting rod 2128 away from the wave trough 2124 and the corresponding connecting rod 2125 of the annular wave-shaped supporting rod 2120. Since the wave trough 2124 and the two wave crests 2126 are adjacent to the proximal end of the window 211, the support portion 2122 can better support the window 211, thereby reducing deformation of the window 211 and facilitating insertion of the branch pipe 40 into the window 211.

As shown in fig. 10, fig. 10 is a schematic structural view of an embedded branch stent of a vascular stent according to a fourth embodiment of the present invention. The utility model discloses the structure of the embedded branch support that the fourth embodiment provided is similar with the structure of third embodiment, and the difference lies in: in the fourth embodiment, the main body support frame 212 of the main body tube 21 is also provided with a support portion of a small waveform at the distal end of the window 211, the support portion being provided on the valley of the annular waveform support rod 2120 adjacent to the window 211. Specifically, the supporting portion includes a peak 2126a adjacent to the distal edge of the window 211, a connecting rod 2128a at two opposite ends of the peak 2126a, and a valley 2124a connected to one end of each connecting rod 2128a away from the peak 2126a and the connecting rod 2125 of the corresponding annular wave-shaped supporting rod 2120. Since the wave peak 2126a and the two wave troughs 2124a are adjacent to the window 211, the supporting portion can better support the window 211, and reduce the deformation of the window 211.

The above is an implementation manner of the embodiments of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principles of the embodiments of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims (18)

1. The utility model provides an embedded branch's support, its includes the main part pipe, the main part pipe includes the main part tectorial membrane, its characterized in that, at least one windowing has been seted up on the main part tectorial membrane, embedded branch's support still including set up in at least one embedded bleeder of the inner chamber of main part pipe, at least one embedded bleeder is from at least one windowing towards the inner chamber of main part pipe extends, the angle between the axis of embedded bleeder and the axis of main part pipe is greater than 0 degree.

2. The inline branch stent according to claim 1, wherein an angle between the axis of the inline branch tube and the axis of the main body tube is 5 degrees, 45 degrees, or a value in a range of 5 degrees to 45 degrees.

3. The inline-bifurcation stent of any one of claims 1 or 2, wherein the inline-bifurcation comprises an inline-bifurcation covering membrane connected to the fenestration, and the inline-bifurcation covering membrane is in sealing connection with the main body covering membrane except the fenestration.

4. The inline-bifurcation stent of claim 3, wherein the inline-bifurcation stent is tubular in shape, and the proximal end of the inline-bifurcation stent is sealingly connected to the edge of the fenestration.

5. The embedded branch stent of claim 3, wherein an elastic embedded branch framework is arranged on the inner circumferential surface or the outer circumferential surface of the embedded branch covering membrane.

6. The in-line bifurcation stent of claim 3, wherein a transitional covering membrane is connected between the in-line bifurcation and the fenestration, the distal end of the transitional covering membrane is hermetically connected to the edge of the fenestration, and the proximal end of the transitional covering membrane is connected to the in-line bifurcation.

7. The inline-bifurcation stent of claim 6, wherein the transitional covering membrane has a conical ring shape, and the outer diameter of the proximal end of the transitional covering membrane is larger than the outer diameter of the distal end of the transitional covering membrane.

8. The inline-bifurcation stent of claim 6, wherein the cross-section of the distal end of the transitional tectorial membrane is recessed relative to the fenestration to form a guide.

9. The embedded branch stent of claim 6, wherein an elastic supporting framework is arranged on the inner circumferential surface or the outer circumferential surface of the transitional coating.

10. The inline-bifurcation stent of claim 6, wherein the inline-bifurcation comprises a support scaffold connected to the transitional covering membrane.

11. The inline branch stent of claim 1, wherein the fenestration edge is provided with a support for bracing the fenestration to maintain it in an open state.

12. The inline bifurcation stent of claim 11, wherein the support member is a support ring extending along the edge of the fenestration, the support ring being of circular, oval or fusiform configuration.

13. The inline branch stent of claim 12, wherein the support ring is made of an alloy wire containing a developing material; or the support ring is continuously or discontinuously wound with developing wires; or the support ring is provided with developing points in a connecting or discontinuous mode.

14. The inline branch stent of claim 1, wherein the fenestrated edge is provided with a plurality of visualization points.

15. The inline branch stent of claim 1, wherein a support ring is provided at the orifice of the proximal end and/or distal end of the inline branch tube.

16. The inline branch stent of claim 15, wherein the support ring is made of an alloy wire of a developer material; the support ring is continuously or discontinuously wound with developing wires; or the support ring is provided with developing points in a connecting or discontinuous mode.

17. The embedded branch stent of claim 1, wherein the main tube further comprises a main support framework attached to the inner circumferential surface or the outer circumferential surface of the main covering membrane, and a support part is disposed at the proximal end and/or the distal end of the main support framework for opening the fenestration.

18. A vascular stent comprising an inline branch stent according to any one of claims 1 to 17, and at least one branch tube, wherein a proximal end of the branch tube is inserted into the inline branch tube of the inline branch stent through the fenestration.