Vascular stent and its embedded branch stent

Abstract

The present invention provides a vascular stent, which comprises an embedded branch stent and at least one branch tube. The embedded branch stent comprises a main body tube, the main body tube comprises a main body film, and at least one window is formed in the main body film. The embedded branch stent further comprises at least one embedded branch tube disposed in the inner cavity of the main body tube. At least one of the embedded branch tubes extends from at least one of the windows toward the inner cavity of the main body tube. The angle between the axis of the embedded branch tube and the axis of the main body tube is greater than 0 degree. The proximal end of the branch tube passes through the window and is inserted into the embedded branch tube of the embedded branch stent. The present invention also provides an embedded branch stent of the vascular stent.

Description

Technical Field

[0001] The present invention relates to the technical field of implantable blood vessels, and particularly to a blood vessel stent with an embedded branch stent and the embedded branch stent of the blood vessel stent. Background Art

[0002] An aortic aneurysm refers to local or diffuse abnormal dilation of the aortic wall, which compresses surrounding organs and causes symptoms. Rupture of the aneurysm is its main risk. It often occurs in the ascending aorta, aortic arch, descending thoracic aorta, thoracoabdominal aorta, and abdominal aorta. Aortic aneurysms can be classified into true aortic aneurysms and false aortic aneurysms according to their structure. An aortic aneurysm causes an increase in the medial pressure of the blood vessel, so it expands progressively. If it develops for a long time, it will eventually rupture. The larger the aneurysm, the greater the possibility of rupture.

[0003] Aortic dissection is another serious aortic disease. Aortic dissection refers to the destruction of the media of the thoracic aorta, bleeding within the blood vessel wall, and blood entering the space between the media and adventitia of the blood vessel wall. Due to the impact of blood flow, once an aortic dissection forms, the tear can extend along the direction of blood flow, the dissection and false lumen expand, and the true lumen is compressed. Therefore, the risks that aortic dissection patients may face include: (1) being threatened by near-complete rupture of the blood vessel. Once the blood vessel completely ruptures, the mortality rate is extremely high; (2) the dissection gradually expands and compresses the true lumen, reducing blood supply to the distal part of the blood vessel. In most cases, aortic dissection is secondary to a thoracic aortic aneurysm or coexists with an aortic aneurysm.

[0004] All aortic aneurysm diseases may involve branch arteries. Once branch arteries are involved, it will be extremely difficult to solve the problem through interventional methods. Currently, endovascular treatment of arteries has been carried out at home and abroad, that is, a minimally invasive method is used to implant a graft, namely an arterial covered stent, into the diseased artery through the blood vessel lumen to treat arterial diseases and improve blood supply, so as to achieve the treatment purpose. The so-called endovascular arterial covered stent is composed of a tubular rigid wire stent and an artificial blood vessel fixed on the outside of the stent. The tubular rigid wire stent is formed by enclosing a ring with elastic rigid wires after Z-shaped folding, and then sewing or bonding multiple rings together with the artificial blood vessel to form a tubular covered stent. When in use, the tubular covered stent is axially compressed and loaded into a delivery device, and the delivery device sends it to the diseased artery through the smaller femoral artery, iliac artery, or brachial artery and then releases it. Due to the elastic force of the metal wire stent, it automatically returns to a straight tubular shape and adheres tightly to the inner wall of the aorta, isolating the diseased part of the artery from the blood flow, thus achieving the treatment purpose.

[0005] In the prior art, the commonly used stents for arterial branch treatment include chimney stents, one-piece multi-branch stents, and fenestrated stents. These stents are limited by the stent structure and often require temporary customization or are prone to problems such as endoleakage. Especially for some branches with relatively small connection angles, when the branch stent connects the branch blood vessel and the main stent, there is often a large bending angle, which causes the branch stent to be squeezed by the main stent and become blocked. Summary of the Invention

[0006] The purpose of the present invention is to provide an embedded branch stent capable of preventing endoleakage, and a vascular stent provided with the embedded branch stent.

[0007] To solve the above technical problems, the present invention provides an embedded branch stent, which includes a main body tube. The main body tube includes a main body film, and at least one window is opened on the main body film. The embedded branch stent further includes at least one embedded branch tube disposed in the inner cavity of the main body tube. At least one of the embedded branch tubes extends from at least one of the windows into the inner cavity of the main body tube, and the angle between the axis of the embedded branch tube and the axis of the main body tube is greater than 0 degrees.

[0008] The present invention also provides a vascular stent, which includes an embedded branch stent and at least one branch tube. The embedded branch stent includes a main body tube. The main body tube includes a main body film, and at least one window is opened on the main body film. The embedded branch stent further includes at least one embedded branch tube disposed in the inner cavity of the main body tube. At least one of the embedded branch tubes extends from at least one of the windows into the inner cavity of the main body tube, and the angle between the axis of the embedded branch tube and the axis of the main body tube is greater than 0 degrees. The proximal end of the branch tube passes through the window and is inserted into the embedded branch tube of the embedded branch stent.

[0009] The embedded branch stent of the vascular stent provided by the present invention includes a main body tube and at least one branch tube disposed in the inner cavity of the main body tube. The angle between the axis of the embedded branch tube and the axis of the main body tube is greater than 0 degrees. When the branch tube needs to be connected to the embedded branch stent, the proximal end of the branch tube is inserted into the inner cavity of the embedded branch tube. The embedded branch tube can hermetically wrap the outer peripheral surface of the proximal end of the branch tube, thereby effectively preventing endoleakage and facilitating the insertion of the branch tube onto the embedded branch stent. In addition, since the angle between the axis of the embedded branch tube and the axis of the main body tube is greater than 0 degrees, the branch tube is obliquely connected to the main body tube, which can prevent the branch tube from being squeezed and bent, thereby preventing the branch tube from being blocked. Brief Description of the Drawings

[0010] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the implementation. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a schematic structural diagram of a vascular stent provided by the first embodiment of the present invention.

[0012] Figure 2 is Figure 1 a schematic structural diagram of the embedded branch stent in

[0013] Figure 3 is Figure 2 a three-dimensional structural diagram of the annular corrugated support rod in

[0014] Figure 4 is Figure 1 a schematic structural diagram of connecting the annular corrugated support rod to the main body film in

[0015] Figures 5a - 5c It is a schematic structural diagram of other forms of the embedded branch tube of the embedded branch stent of the present invention.

[0016] Figure 6 is Figure 1 an enlarged view of the proximal part of the embedded branch stent in

[0017] Figure 7a and Figure 7b are schematic structural diagrams of different developing structures around the fenestration of the embedded branch stent of the present invention.

[0018] Figure 8 It is a schematic structural diagram of the embedded branch stent of the vascular stent provided by the second embodiment of the present invention.

[0019] Figure 9 It is a schematic structural diagram of the embedded branch stent of the vascular stent provided by the third embodiment of the present invention.

[0020] Figure 10 It is a schematic structural diagram of the embedded branch stent of the vascular stent provided by the fourth embodiment of the present invention. Specific Embodiments

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] In addition, the descriptions of the following embodiments refer to the attached drawings for exemplifying specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are only with reference to the directions of the attached drawings. Therefore, the directional terms used are for better and clearer illustration and understanding of the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0023] In the description of the present invention, the "proximal end" of the present invention refers to the end close to the heart position, and the "distal end" is the end far from the heart position. The high and low in the present invention are relative to the main body tube membrane. The end face exceeding the main body tube membrane is called high, and the end face not exceeding the main body tube membrane end face is called low. This definition is only for convenience of expression and cannot be construed as a limitation to the present invention.

[0024] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vascular stent provided by the first embodiment of the present invention. The present invention provides a vascular stent 100, which includes an embedded branch stent 20 and at least one branch tube 40. The embedded branch stent 20 includes a main body tube 21 and at least one embedded branch tube 25. The main body tube 21 is an equal-diameter structure or a non-equal-diameter structure. The main body tube 21 includes a tubular main body membrane 210, and at least one of the embedded branch tubes 25 is disposed in the inner cavity of the main body tube 21 of the embedded branch stent 20. At least one window 211 is opened on the main body membrane 210, and at least one of the embedded branch tubes 25 extends from at least one of the windows 211 into the inner cavity of the main body tube 21. The angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 is greater than 0 degrees. The proximal end of the branch tube 40 passes through the window 211 and is inserted into the inner cavity of the embedded branch tube 25 of the embedded branch stent 20, and the embedded branch tube 25 is sealingly sleeved on the proximal end of the embedded branch tube 25.

[0025] In this embodiment, the main body tube 21 is a non-equal-diameter structure, the diameter of the proximal end of the main body tube 21 is greater than that of the distal end, and the diameter of the main body tube 21 gradually tapers from the proximal end to the distal end.

[0026] Specifically, the main body membrane 210 is a tubular structure, and the shape of its transverse end face is a circle, an ellipse or a rhombus that matches the blood vessel. At least one of the windows 211 is opened on the tubular membrane, and the window 211 can be a circular hole, an elliptical hole, a rhombus hole or an irregular curved surface, etc. The main body membrane 210 is made of polyester cloth, PTFE, PET or other polymer materials.

[0027] Both the embedded branch stent 20 and the branch tube 40 are self-expanding stents. When the embedded branch stent 20 or the branch tube 40 is delivered through a sheath, the diameter of the embedded branch stent 20 or the branch tube 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 automatically expand to the required shape and size, so that the embedded branch stent 20 or the branch tube 40 can be supported on the inner wall of the blood vessel lesion site, 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 being able to reconstruct the blood vessel.

[0028] The embedded branch stent 20 of the vascular stent 100 of the present invention includes a main body tube 21 and at least one branch tube 40 disposed in the inner cavity of the main body tube 21. The angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 is greater than 0 degree. When the branch tube 40 needs to be connected to the embedded branch stent 20, the proximal end of the branch tube 40 is inserted into the inner cavity of the embedded branch tube 25, and the embedded branch tube 25 can hermetically wrap the outer peripheral surface of the proximal end of the branch tube 40, thereby effectively preventing endoleakage and facilitating the insertion of the branch tube 40 onto the embedded branch stent 20. In addition, since the angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 is greater than 0 degree, the branch tube 40 is obliquely connected to the main body tube 21, which can prevent the branch tube 40 from being squeezed and bent, thereby preventing the branch tube 40 from being blocked.

[0029] Preferably, the angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 is 5 degrees, 45 degrees or a value within the range of 5 degrees to 45 degrees. Specifically, when the main body tube 21 and the embedded branch tube 25 are in the extended state, the embedded branch tube 25 is obliquely connected to the main body tube 21, that is, the angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 is 5 degrees, 45 degrees or a value within the range of 5 degrees to 45 degrees. When the proximal end of the branch tube 40 is inserted into the embedded branch tube 25, the axis of the proximal end of the branch tube 40 coincides with the axis of the embedded branch tube 25, so that the branch tube 40 is obliquely connected to the main body tube 21.

[0030] In other embodiments, the angle between the axis of the embedded branch tube 25 and the axis of the main body tube 21 can be selected as a suitable angle value according to needs.

[0031] The axial extension length of the embedded branch pipe 25 is greater than or equal to 2 mm. Preferably, the axial extension length of the embedded branch pipe 25 is a value within the range of 2 mm, 100 mm, or 2 mm to 100 mm. The inner diameter of the embedded branch pipe 25 is greater than or equal to 2 mm. Preferably, the inner diameter of the embedded branch pipe is a value within the range of 2 mm, 5 mm, or 2 mm to 5 mm. The embedded branch pipe 25 serves as an anchoring portion for the connection between the main pipe 21 and the branch pipe 40. The longer the axial extension length of the embedded branch pipe 25, the longer the length of the sealed socket joint between the embedded branch pipe 25 and the branch pipe 40, enabling the proximal end portion of the branch pipe 40 to be more stably connected to the main pipe 21, thereby achieving a better leak prevention effect.

[0032] Please refer to Figures 2 to 4 , Figure 2 is Figure 1 a schematic structural view of the embedded branch stent in Figure 3 is Figure 2 a three-dimensional structural view of the annular corrugated support rod in Figure 4 is Figure 1 a schematic structural view of the annular corrugated support rod connected to the main body film. The main pipe 21 further includes a main body support skeleton 212 disposed on the inner peripheral surface or the outer peripheral surface of the main body film 210. Specifically, the main body support skeleton 212 is sutured to the inner peripheral surface or the outer peripheral surface of the main body film 210 by a suture. The main body support skeleton 212 can be an elastic metal support skeleton or an elastic non-metal support skeleton such as a polymer material. In this embodiment, the main body support skeleton 212 is a nickel alloy stent. When the main body support skeleton 212 is transported through a sheath tube, the diameter of the main body support skeleton 212 can be contracted to a smaller state for transportation in the sheath tube; when the main body support skeleton 212 is released in a blood vessel, the main body support skeleton 212 can automatically expand to the required shape and size so that the main body support skeleton 212 can support on the inner wall of the corresponding blood vessel.

[0033] The main body support skeleton 212 can be formed by laser cutting a nickel alloy tube or woven from metal wires such as nickel alloy wires. The density of the mesh structure of the main body support skeleton 212 is set as needed. In this embodiment, the main body support skeleton 212 includes a plurality of annular corrugated support rods 2120 in a Z shape or a sine wave shape, and these annular corrugated support rods 2120 are arranged at intervals along the axial direction of the main body film 210, that is, these annular corrugated support rods 2120 are arranged in parallel with gaps in sequence from the proximal end to the distal end of the main pipe 21.

[0034] Each annular corrugated support rod 2120 can be an equal-height wave support rod or a high-low wave support rod, etc. The equal-height wave support rod means that the heights of all the wave crests on the annular corrugated support rod 2120 are the same, and the heights of all the wave troughs are also the same, that is, all the wave crests and all the wave troughs are respectively on the same plane. The high-low wave support rod means that the heights of all the wave crests on the annular corrugated support rod 2120 are different, and the heights of all the wave troughs can also be different. In this embodiment, the annular corrugated support rods 2120 of the main body tube 21 are all equal-height wave support rods.

[0035] As Figure 3 shown, each Z-shaped or sine wave shape of each annular corrugated support rod 2120 includes a wave crest 2121, a wave trough 2123, and a connecting rod 2125 connecting between the wave crest 2121 and the wave trough 2123. Each annular corrugated support rod 2120 is woven by a superelastic nickel-titanium wire, and the selectable wire diameter (i.e., diameter) range of the superelastic nickel-titanium alloy wire is 0.2 mm to 0.55 mm. A connecting sleeve 2127 is provided on each annular corrugated support rod 2120, and the connecting sleeve 2127 connects the opposite ends of the annular corrugated support rod 2120, that is, the opposite ends of the annular corrugated support rod 2120 are both received in the connecting sleeve 2127, and then the two ends of the nickel-titanium wire are fixed inside the connecting sleeve 2127 by mechanical pressing or welding.

[0036] In this embodiment, the annular corrugated support rod 2120 is woven by a nickel-titanium wire with a diameter of 0.4 mm, the number of Z-shaped or sine waves is 9, and the vertical height of the annular corrugated support rod 2120 is 8 - 15 mm.

[0037] In other embodiments, the main body support frame 212 can be a woven mesh structure or a cut mesh structure.

[0038] In other embodiments, the number of sine waves of the annular corrugated support rod 2120 can be determined as needed, and the vertical height of the annular corrugated support rod 2120 can be any height.

[0039] As Figure 4 shown, each annular corrugated support rod 2120 of the main body support frame 212 is sutured to the main body film 210 by a suture 23, that is, the suture 23 can follow the waveform of each annular corrugated support rod 2120 and accompany the entire main body support frame 212. The suture 23 can also suture each annular corrugated support rod 2120 to the main body film 210 through a number of non-equidistantly distributed suture knots. The selectable diameter range of the suture 23 is 0.05 mm - 0.25 mm. Or the main body support frame 212 can also be fixedly connected to the main body film 210 by hot pressing.

[0040] A transition coating 251 is connected between the embedded branch pipe 25 and the window 211. The transition coating 251 is tubular or conical ring-shaped, and the shape of its transverse end surface corresponds to the shape of the window 211, that is, it can be circular, elliptical or prismatic. The transition coating 251 extends from the window 211 toward the inner cavity of the main tube 21. One end of the transition coating 251 is sealed to the edge of the window 211, and the other end of the transition coating 251 is sealed to the proximal end of the embedded branch pipe 25. Specifically, the edge of the proximal end of the transition coating 251 is sealed to the edge of the main coating 210 at the window 211, and the edge of the distal end of the transition coating 251 is sealed to the circumferential surface of the proximal end of the embedded branch pipe 25. The outer diameter of the proximal end of the transition coating 251 is greater than the outer diameter of the distal end. The transition coating 251 is made of polyester cloth, PTFE, PET or other polymer materials. Since a transition coating 251 is connected between the embedded branch 25 and the window 211 , the transition coating 251 can be sealed between the main coating 210 and the embedded branch 25 . Therefore, the main coating 210 can prevent internal leakage between the embedded branch 25 and the window 211 .

[0041] In another embodiment, the outer diameter of the distal end of the transitional coating 251 is greater than the outer diameter of the proximal end, so that the transitional coating forms an inner concave portion, and the inner concave portion has a guiding function. Alternatively, the cross section of the distal end of the transitional coating 251 is concave inward relative to the window to form a guiding portion, so that the connection between the branch pipe 40 and the embedded branch pipe 25 is smoother.

[0042] In this embodiment, the proximal end of the transitional coating 251 is sutured to the main coating 210 at the edge of the window 211 by sutures, and the distal end of the transitional coating 251 is sutured to the proximal end of the embedded branch tube 25 by sutures. The distal end of the transitional coating 251 can be an integral structure with the proximal end of the embedded branch tube 25.

[0043] In other embodiments, the connection between the proximal end of the transitional coating 251 and the main body coating 210 may be made by medical glue, and the connection between the distal end of the transitional coating 251 and the embedded branch tube 25 may also be made by medical glue.

[0044] In other embodiments, a support frame may be further provided on the transitional coating 251 to prop up the transitional coating 251. The support frame may be sutured to the inner circumference or outer circumference of the transitional coating 251 by sutures.

[0045] The embedded branch 25 includes a tubular embedded branch film 253 and a support framework 255 disposed on the embedded branch film 253, that is, the embedded branch film 253 is adhered to the inner circumferential surface or the outer circumferential surface of the support framework 255. Specifically, the support framework 255 is fixed to the inner circumferential surface, the outer circumferential surface of the embedded branch film 253 or between multiple layers of films by suture or hot pressing. The shape of the transverse end surface of the embedded branch film 253 is circular, elliptical or rhombic that matches the proximal end of the branch pipe 40, and the proximal end of the embedded branch film 253 is connected to the distal end of the transition film 251. The distal end of the embedded branch film 253 extends towards the inner cavity of the main pipe 21. In the extended state, the angle between the axis of the embedded branch film 253 and the axis of the main pipe 21 is greater than 0 degree. The main film 210 is made of polyester cloth, PTFE, PET or other polymer materials.

[0046] The support framework 255 can be an elastic metal support framework or an elastic non-metal support framework such as a polymer material. In this embodiment, the support framework 255 is a nickel alloy stent. When the support framework 255 is transported through a sheath tube, the diameter of the support framework 255 can be shrunk to a smaller state for transportation in the sheath tube; when the support framework 255 is released, the support framework 255 can automatically expand to the required shape and size. The support framework 255 can support the embedded branch film 253 to keep the embedded branch film 253 in an open state, facilitating the connection of the branch pipe 40.

[0047] The support framework 255 can be formed by laser cutting a nickel alloy tube or woven from metal wires such as nickel alloy wires. The density of the mesh structure of the support framework 255 is set as required. In this embodiment, the support framework 255 includes a plurality of Z-shaped or sinusoidal annular corrugated support rods, and these annular corrugated support rods are arranged at intervals along the axial direction of the embedded branch film 253, that is, these annular corrugated support rods are arranged in parallel gaps in sequence from the proximal end to the distal end of the embedded branch film 253.

[0048] The inner diameter of the embedded branch 25 is less than or equal to the outer diameter of the proximal end of the branch pipe 40. After the proximal end portion of the branch pipe 40 passes through the window 211 and is inserted into the embedded branch 25 and released, the support framework 255 presses against the outer wall of the branch pipe 40, making the connection between the branch pipe 40 and the embedded branch 25 firmer and capable of maintaining the shape of the branch pipe 40 entering the embedded branch 25; the embedded branch film 253 wraps around the outer circumferential surface of the proximal end of the branch pipe 40, thereby further preventing internal leakage.

[0049] Please refer to Figures 5a to 5c , Figures 5a - 5cThis is a schematic structural diagram of other forms of the embedded branch pipe of the embedded branch stent of the present invention. The support skeleton 255 of the embedded branch 25 can be selected from any of the annular support frames shown in Figure 5a and 5b shown, or the mesh skeleton shown in Figure 5c shown. The annular support frame includes a plurality of annular corrugated support rods in a Z shape or a sine wave shape, and these annular corrugated support rods are arranged at intervals along the axial direction of the embedded branch 25. The mesh skeleton can be made by weaving or cutting.

[0050] In other embodiments, the embedded branch 25 only includes the embedded branch film 253, that is, the support skeleton 255 on the embedded branch film 253 can be omitted, and the proximal end of the embedded branch film 253 is connected to the distal end of the transition film 251.

[0051] In other embodiments, the embedded branch 25 only includes the support skeleton 255, that is, the embedded branch film 253 on the support skeleton 255 can be omitted, the support skeleton 255 is a bare stent, and the bare stent can be a bare stent with a woven or cut structure. The proximal end of the bare stent is connected to the distal end of the transition film 251.

[0052] In other embodiments, the embedded branch pipe 25 includes the embedded branch film 253 directly connected to the fenestration 211. The embedded branch film 253 is hermetically connected to the main body film 210 except at the fenestration 211, and the embedded branch film 253 is used to wrap the proximal end of the branch pipe 40. Specifically, the transition film 251 between the embedded branch pipe 25 and the fenestration 211 can be omitted, and instead, the proximal end of the embedded branch film 253 is directly and hermetically connected to the main body film 210 at the edge of the fenestration 211. The embedded branch film 253 is a tubular structure, and the shape of the cross-section of the embedded branch film 253 is the same as the shape of the fenestration 211, specifically circular, elliptical or rhombic, etc. An elastic embedded branch skeleton can be provided on the embedded branch film 253, and the embedded branch skeleton is attached to the inner peripheral surface or the outer peripheral surface of the embedded branch film 253. The embedded branch skeleton can make the connection of the branch pipe 40 connected to the inside of 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 film 253 can also be omitted.

[0053] Such as Figure 6As shown, a support member 214 is provided at the edge of the window opening 211. The support member 214 is used to expand the window opening 211 so that the window opening 211 remains in an open state. The support member 214 is a support rod fixed to the edge of the window opening 211. The support rod extends along the edge of the window opening 211, and the support rod adapts to the shape of the edge of the window opening 211. Specifically, the support rod can be a circular, elliptical or rhombic ring structure.

[0054] Preferably, the support member 214 is a support ring extending along the edge of the window opening 211, and the support ring has elasticity. When a branch pipe 40 is connected inside the window opening 211, the support ring can closely adhere to the outer surface of the branch pipe 40 to prevent internal leakage at the connection between the branch pipe 40 and the main body pipe 21. The support member 214 is made of a memory alloy, preferably a nickel-titanium alloy.

[0055] In this embodiment, a developing structure 215 is provided around the window opening 211 of the main body film 210. The developing structure 215 is a plurality of developing points arranged continuously or discontinuously along the edge of the window opening 211 on the main body film 210. These developing points can be fixed on the main body film 210 by means of sewing, stamping, inlaying or pasting. These developing points are arranged at least in one circle along the four edges of the window opening 211. The material of the developing structure 215 can be made of a material with good X-ray impermeability, strong corrosion resistance and good biocompatibility. The materials of the developing member include but are not limited to materials such as gold, platinum, tantalum, osmium, rhenium, tungsten, iridium, rhodium or alloys or composites of these metals. In this embodiment, the developing points are tantalum-containing nickel-titanium alloy metal sheets. The ring formed by these developing points is consistent with the shape of the window opening 211. Therefore, these developing points form a continuous or discontinuous ring-shaped developing mechanism. During the operation, the position of the developing structure 215 can be clearly observed through an imaging device, that is, it can be observed that the developing points near the window opening 211 are a ring-shaped developing mechanism around the edge of the window opening 211. Therefore, it is more convenient and rapid to insert the proximal end of the branch pipe 40 into the embedded branch 25.

[0056] As Figure 7a shown, in other embodiments, the developing structure 215 is a developing wire continuously or discontinuously wound around the support member 214. The developing wire can be a tantalum-containing nickel-titanium alloy metal wire, and the diameter of the nickel-titanium alloy metal wire is 0.10 - 0.40 mm. Since the developing structure 215 has developability and is ring-shaped, the position of the developing structure 215 can be clearly observed through an imaging device during the operation, that is, it can be observed that the developing structure 215 is a ring-shaped developing structure around the edge of the window opening 211, rather than scattered developing points. Therefore, it is more convenient and rapid to insert the branch pipe 40 into the embedded branch 25.

[0057] As shown Figure 7b In other embodiments, the developing structure 215 is a developing point continuously or discontinuously fixed on the support 214. The developing point is fixed on the support 214 by means of stitching, stamping, hot pressing, inlaying or pasting. These developing points are arranged around the support 214 for at least one turn.

[0058] In other embodiments, the support 214 is made of an alloy doped with a developing material, and the developing structure 215 is a developing material fused in the support 214. The support 214 is formed by enclosing a nickel-titanium alloy wire containing tantalum, and the wire diameter of the support 214 is 0.10 - 0.40 mm. Since the support 214 is made of an alloy containing a developing material, the support 214 can be directly used as a developing structure without additionally providing a developing structure on the support 214. During the operation, the position of the support 214 can be clearly observed through an imaging device, and it is convenient to quickly insert the branch tube 40 into the window 211, which is convenient to use.

[0059] In other embodiments, at least one turn of nickel-titanium alloy wire can be inlaid on the outer surface of the support 214, or at least one turn of nickel-titanium alloy wire can be pasted on the outer surface of the support 214. Preferably, tantalum wire is wound around the support 214.

[0060] Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of the embedded branch stent provided by the second embodiment of the present invention. The structure of the embedded branch stent provided by the second embodiment of the present invention is similar to that of the first embodiment. The difference is that in the second embodiment, a support ring 256 is provided at the proximal end and / or the distal end of the opening of the embedded branch tube 25. The support ring 256 is used to expand the embedded branch film 253 so that the embedded branch film 253 remains in an unfolded state, facilitating the insertion of the branch tube 40. The support ring 256 extends along the edge of the opening at the proximal end or the distal end of the embedded branch film 253, and the support ring 256 adapts to the edge shape of the cross-section of the embedded branch tube 25. Specifically, the support ring 256 can be circular, elliptical or rhombic. The support ring 256 has elasticity. When the branch tube 40 needs to be connected in the window 211, the support ring 256 can closely adhere to the outer surface of the branch tube 40 to prevent internal leakage at the connection between the branch tube 40 and the embedded branch tube 25. The support ring 256 is made of a memory alloy, preferably nickel-titanium alloy.

[0061] A circumferential imaging part is provided at the proximal end and / or the distal end of the embedded branch tube 25, and the circumferential imaging part is arranged around the circumference of the embedded branch tube 25 for at least one turn. The circumferential imaging part can be arranged at the edge of the opening at the proximal end and / or the distal end of the embedded branch film 253, or the circumferential imaging part can also be the support ring 256 of the embedded branch tube 25. The circumferential imaging part arranged on the support ring 256 includes but is not limited to the following several types: Imaging wires, such as tantalum-containing nitinol alloy wires with a diameter of 0.10-0.40 mm, are connected or intermittently wound on each support ring 256; since the imaging wires on the support ring 256 have imaging properties and are annular, a circumferential imaging part is formed; during the operation, the position of the imaging wires on the support ring 256 can be clearly observed through the imaging device, so as to conveniently and quickly insert the branch tube 40 into the embedded branch 25. Secondly, imaging points are continuously or intermittently fixed on each support ring 256, and these imaging points enclose a circumferential imaging part, and these imaging points are fixed on the support ring 256 by means of sewing, stamping, hot pressing, inlaying or pasting. In addition, each support ring 256 can also be made of an alloy doped with an imaging material, such as tantalum-containing nitinol alloy wires, so that the support ring 256 itself forms a circumferential imaging part.

[0062] Please refer to Figure 9 , Figure 9 FIG. Figure 9 is a schematic structural view of the embedded branch stent provided by the third embodiment of the present invention. The structure of the embedded branch stent provided by the third embodiment of the present invention is similar to that of the first embodiment, and the difference lies in that: in the third embodiment, small-wave-shaped support parts 2122 are provided at the proximal end and / or the distal end of the main body support skeleton 212 of the main body tube 21 at the window 211, and the support parts 2122 are used to better expand the window 211.

[0063] Specifically, the support part 2122 is arranged on the peaks and / or valleys of the annular wave-shaped support rods 2120 adjacent to the window 211, so that the support part 2122 is located at the proximal end and / or the distal end of the window 211. When the support part 2122 is arranged on the peak of the annular wave-shaped support rod 2120, the support part 2122 includes a valley 2124 adjacent to the edge of the window 211, connecting rods 2128 located at opposite ends of the valley 2124, and peaks 2126 of the connecting rods 2125 connecting each connecting rod 2128 away from the valley 2124 to the corresponding annular wave-shaped support rod 2120. Since the valley 2124 and the two peaks 2126 are both adjacent to the proximal end of the window 211, the support part 2122 can better expand the window 211, thereby reducing the deformation of the window 211 and facilitating the insertion of the branch tube 40 into the window 211.

[0064] AsFigure 10 As shown Figure 10 It is a schematic structural view of the embedded branch stent of the vascular stent provided by the fourth embodiment of the present invention. The structure of the embedded branch stent provided by the fourth embodiment of the present invention is similar to that of the third embodiment. The difference is that in the fourth embodiment, a small-wave-shaped support portion is also provided at the distal end of the main body support skeleton 212 of the main body tube 21 at the fenestration 211, and the support portion is provided on the trough of the annular wave-shaped support rod 2120 adjacent to the fenestration 211. Specifically, the support portion includes a wave crest 2126a adjacent to the far edge of the fenestration 211, connecting rods 2128a located at opposite ends of the wave crest 2126a, and connecting rods 2125 connecting to the trough 2124a of the corresponding annular wave-shaped support rod 2120 at the end of each connecting rod 2128a away from the wave crest 2126a. Since the wave crest 2126a and the two troughs 2124a are all adjacent to the fenestration 211, therefore, the support portion can better expand the fenestration 211 and reduce the deformation of the fenestration 211.

[0065] The above are the implementation manners of the embodiments of the present invention. It should be noted that for those of ordinary skill in the art in the technical field, without departing from the principle of the embodiments of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. An inlaid branch stent, which comprises a main body tube, the main body tube includes a main body film, and is characterized in that, at least one window is opened on the main body film, the inlaid branch stent further includes at least one inlaid branch tube disposed in the inner cavity of the main body tube, at least one of the inlaid branch tubes extends from at least one of the windows toward the inner cavity of the main body tube, and the angle between the axis of the inlaid branch tube and the axis of the main body tube is greater than 0 degrees; the main body tube further includes a main body support skeleton attached to the inner peripheral surface or the outer peripheral surface of the main body film, the main body support skeleton includes a plurality of annular corrugated support rods, and the main body support skeleton is provided with small corrugated support portions at the proximal end and the distal end of the window, and the support portions are used to better expand the window; the support portion at the proximal end of the window is disposed on the peak of the annular corrugated support rod adjacent to the proximal end of the window, and includes a trough adjacent to the proximal end of the window, connecting rods located at opposite ends of the trough, and a peak of the connecting rod adjacent to the proximal end of the window and connecting the end of each connecting rod away from the trough to the peak of the corresponding annular corrugated support rod; the support portion at the distal end of the window is disposed in the trough of the annular corrugated support rod adjacent to the distal end of the window, and includes a peak adjacent to the distal end of the window, connecting rods located at opposite ends of the peak, and a trough of the connecting rod adjacent to the distal end of the window and connecting the end of each connecting rod away from the peak to the trough of the corresponding annular corrugated support rod.

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

3. The inlaid branch stent according to any one of claims 1 or 2, wherein, the inlaid branch tube includes an inlaid branch film connected to the window, and the inlaid branch film is hermetically connected to the main body film except for the window.

4. The inlaid branch stent according to claim 3, wherein, the inlaid branch film is tubular, and the proximal end of the inlaid branch film is hermetically connected to the edge of the window.

5. The inlaid branch stent according to claim 3, wherein, an elastic inlaid branch skeleton is disposed on the inner peripheral surface or the outer peripheral surface of the inlaid branch film.

6. The inlaid branch stent according to claim 3, wherein, a transition film is connected between the inlaid branch tube and the window, the distal end of the transition film is hermetically connected to the edge of the window, and the proximal end of the transition film is connected to the inlaid branch tube.

7. The inlaid branch stent according to claim 6, wherein, the transition film is in a conical ring shape, and the outer diameter of the proximal end of the transition film is larger than the outer diameter of the distal end.

8. The inlaid branch stent according to claim 6, wherein, the cross section of the distal end of the transition film is concave inward relative to the window to form a guiding portion.

9. The inlaid branch stent according to claim 6, wherein, an elastic support skeleton is disposed on the inner peripheral surface or the outer peripheral surface of the transition film.

10. The inlaid branch stent according to claim 6, wherein the inlaid branch tube includes a support framework connected to the transition film.

11. The inlaid branch stent according to claim 1, wherein a support member is provided at the edge of the fenestration, and the support member is used to expand the fenestration so that the fenestration remains in an open state.

12. The inlaid branch stent according to claim 11, wherein the support member is a support ring extending along the edge of the fenestration, and the support ring has a circular, oval or fusiform structure.

13. The inlaid branch stent according to claim 12, wherein the support ring is made of an alloy wire containing a radiopaque material; or radiopaque wires are continuously or discontinuously wound around the support ring; or radiopaque dots are continuously or discontinuously provided on the support ring.

14. The inlaid branch stent according to claim 1, wherein a plurality of radiopaque dots are provided at the edge of the fenestration.

15. The inlaid branch stent according to claim 1, wherein support rings are provided at the proximal end and / or the distal end of the inlaid branch tube.

16. The inlaid branch stent according to claim 15, wherein the support ring is made of an alloy wire of a radiopaque material; radiopaque wires are continuously or discontinuously wound around the support ring; or radiopaque dots are continuously or discontinuously provided on the support ring.

17. A vascular stent, wherein it includes the inlaid branch stent according to any one of claims 1 to 16, and at least one branch tube, and the proximal end of the at least one branch tube passes through the fenestration and is inserted into the inlaid branch tube of the inlaid branch stent.

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