Aorta covered stent and artery covered stent assembly

Abstract

The invention discloses an aorta covered stent and an artery covered stent assembly, and belongs to the technical field of medical stents.The aorta covered stent comprises a main covered stent body and a positioning covered stent body capable of shrinking in the radial direction, the main covered stent body is provided with a branch connector allowing a branch covered stent body to be inserted therein, and the positioning covered stent body is communicated with the branch connector; the positioning covered stent is located in the main covered stent body, the diameter of the branch connector and the diameter of the positioning covered stent body which does not shrink in the radial direction are both larger than that of the branch covered stent body, and the positioning covered stent body is sleeved with a bundling rope sleeve which can be pulled to be folded. The component comprises a branch covered stent and the aorta covered stent. The structural characteristic that the diameter of the branch connector and the diameter of the non-contracted positioning covered stent are larger than that of the branch covered stent is utilized, the requirement for the precision of the corresponding positions of the branch covered stent and the branch connector can be lowered, the corresponding range of the branch connector is widened, and the influence caused by position deviation of fractures of branch artery blood vessels of different patients is lowered.

Description

Technical Field

[0001] The present invention relates to the technical field of medical stents, and particularly to an aortic covered stent and an arterial covered stent assembly. Background Art

[0002] In aortic diseases, thoracic aortic dissection (TAD) and thoracic aortic aneurysm (TAA) are life-threatening serious lesions. When the lesions involve the aortic arch with complex anatomical structures, clinical treatment faces great challenges. Traditional open surgeries require deep hypothermic circulatory arrest (DHCA) and cardiopulmonary bypass (CPB) support to reconstruct the aortic arch through artificial blood vessel replacement or hybrid replacement surgery of artificial blood vessel + covered stent. However, such surgical methods have significant limitations: deep hypothermic operations are prone to cause cerebral ischemia-reperfusion injury, coagulation dysfunction, and multiple organ failure. In particular, the risk of neurological function injury caused by insufficient cerebral perfusion is as high as 10% - 20%, and in severe cases, it can lead to brain death. In addition, open surgeries have large trauma and a long recovery period, and are not suitable for elderly patients or those with underlying diseases.

[0003] To reduce the surgical trauma, interventional treatment techniques have been gradually applied to aortic arch reconstruction. Among them, the "branched stent endovascular repair" realizes lesion isolation and blood flow reconstruction through the combination of a main body covered stent and branched covered stents to avoid the risks of cardiopulmonary bypass. Specifically, a main body covered stent with three pre-set interfaces needs to be anchored between the ascending aorta and the descending aorta, and the three pre-set interfaces are respectively aligned with the stumps of the three branched arterial vessels (innominate artery, left common carotid artery, left subclavian artery) in the aortic arch. Through a guide wire, three branched covered stents are selected. The selection can be from the descending aorta to the branched arterial vessels or from the branched arterial vessels to the descending aorta. Finally, the branched covered stents are docked with the pre-set interfaces of the main body covered stent to complete the reconstruction of the blood flow path. In order to ensure the stability of implantation, the size of the pre-set interfaces of the main body covered stent needs to match the size of the branched covered stents, that is, their diameters are almost the same. To implant smoothly, the pre-set interfaces need to be accurately aligned with the stumps of the patient's branched arterial vessels. Otherwise, the guide wire cannot be selected in. However, the stump positions of the branched arterial vessels of different patients are slightly different, which results in that one product cannot meet the needs of all patients. Summary of the Invention

[0004] The object of the present invention is to solve the above technical problems, and provide an aortic covered stent and an arterial covered stent assembly. By using the structural feature that the diameter of the branched interface and the unstretched positioning covered stent is larger than the diameter of the branched covered stent, the requirement for the corresponding position accuracy between the branched covered stent and the branched interface can be reduced, the corresponding range of the branched interface can be increased, the influence brought by the position deviation of the stumps of the branched arterial vessels of different patients can be reduced, and the smooth implantation of the branched covered stent into the positioning covered stent can be ensured.

[0005] To achieve the above object, the present invention provides the following solutions: The present invention discloses a main body covered stent, which includes a main body covered stent and a positioning covered stent capable of radially contracting. The main body covered stent is provided with a branch interface for inserting a branch covered stent. The positioning covered stent communicates with the branch interface. The positioning covered stent is located inside the main body covered stent. The diameters of the branch interface and the non-radially contracted positioning covered stent are both larger than that of the branch covered stent. A retractable drawstring sleeve is sleeved outside the positioning covered stent.

[0006] Preferably, the drawstring sleeve includes a guide ring, a rope body, and an anti-retreat mechanism. The guide rings are circumferentially spaced on the outer wall of the positioning covered stent. The rope body includes a sleeved end and a draw end. The sleeved end sequentially passes through all the guide rings. A sliding ring is fixedly connected to the sleeved end. The sliding ring is sleeved on the rope body. The anti-retreat mechanism is used to prevent the sliding ring from moving towards the draw end.

[0007] Preferably, the anti-retreat mechanism includes a base and a push rod; a first wire groove and a second wire groove are provided in the base. The middle parts of the first wire groove and the second wire groove intersect and communicate with each other. The sliding ring is movably arranged in the first wire groove. One end of the first wire groove is closed. A limiting rod is provided at the closed end of the first wire groove. The limiting rod passes through the inner ring of the sliding ring. The limiting rod presses the outer ring of the sliding ring against the closed end of the first wire groove. A blade for cutting the limiting rod and the rope body is provided on the inner ring of the sliding ring. The other end of the first wire groove is provided with a first opening communicating with the outside. The outer diameter of the circumscribed circle of the first opening is smaller than the diameter of the sliding ring. The two ends of the second wire groove are respectively provided with a second opening and a third opening communicating with the outside. The draw end sequentially passes through the first opening, the second opening, and the third opening. In the second wire groove, there are barbs capable of preventing the rope body from moving from the third opening towards the second opening; a counterbore communicating with the third opening is provided on the base. One end of the push rod is used to extend into the counterbore. The rod diameter of the push rod is larger than the third opening. The other end of the push rod is used to extend out of the main body covered stent. A hollow channel is coaxially arranged in the push rod. The draw end of the rope body extends out of the main body covered stent through the hollow channel; the cutting force required for the blade of the sliding ring to cut the limiting rod is smaller than the radial contraction force of the branch covered stent. The cutting force required for the blade of the sliding ring to cut the limiting rod is larger than the cutting force required for cutting the rope body. The radial contraction force of the positioning covered stent is smaller than the cutting force required for cutting the limiting rod.

[0008] Preferably, the positioning covered stent comprises a conical ring-shaped soft film, a tubular positioning covered film, and a tubular positioning stent for maintaining the tubular shape of the positioning covered film. The large-diameter end of the conical ring-shaped soft film is connected to the branch interface, and the diameter of the large-diameter end of the conical ring-shaped soft film matches that of the branch interface. The small-diameter end of the conical ring-shaped soft film is connected to the end of the positioning covered film, and the diameter of the small-diameter end of the conical ring-shaped soft film matches that of the positioning covered film.

[0009] Preferably, the main body covered stent comprises a tubular main body covered film and a tubular main body stent for maintaining the tubular shape of the main body covered film. The branch interface is located on the main body covered film.

[0010] Preferably, three branch interfaces are provided on the main body covered stent, and the three branch interfaces are arranged along the extending direction of the main body covered film; or one branch interface and two to-be-opened areas are provided on the main body covered film, and the two to-be-opened areas are respectively arranged on both sides of the branch interface along the extending direction of the main body covered film; or two branch interfaces and one to-be-opened area are provided on the main body covered film; the two branch interfaces and one to-be-opened area are arranged along the extending direction of the main body covered film, and one of the branch interfaces is located between the to-be-opened area and the other branch interface.

[0011] Preferably, the main body covered film is sequentially divided into an ascending artery area and a descending artery area along its extending direction. The main body stent comprises an inner stent at the ascending artery end, an outer stent at the ascending artery end, and a stent at the descending artery end. The inner stent at the ascending artery end is located on the inner wall of the end of the ascending artery area far from the descending artery area. The outer stent at the ascending artery end is arranged on the outer wall of the ascending artery area. The stent at the descending artery end is spacedly arranged on the outer wall of the descending artery area. The outer stent at the ascending artery end is located between the inner stent at the ascending artery end and the stent at the descending artery end. Both the inner stent at the ascending artery end and the outer stent at the ascending artery end are corrugated stents. The transition section between the wave crests and wave troughs of the inner stent at the ascending artery end and the outer stent at the ascending artery end is an arc section, and the arc top of the arc section faces away from the descending artery area.

[0012] Preferably, a telescopic corrugated pipe section is provided on the ascending artery area.

[0013] Preferably, there is one inner stent at the ascending artery end, two outer stents at the ascending artery end, and two corrugated pipe sections. The two corrugated pipe sections are spacedly arranged on the ascending artery area. The corrugated pipe sections divide the ascending artery area into three stent arrangement areas from one end to the other end. The inner stent at the ascending artery end is arranged on the inner wall of the stent arrangement area far from the descending artery area. The two stents at the descending artery end are arranged on the outer walls of the other two stent arrangement areas. The wave crests of the inner stent at the ascending artery end are bent towards the central axis of the main body covered film.

[0014] An arterial covered stent assembly is also disclosed, which includes a branch covered stent and the above-mentioned aortic covered stent.

[0015] The present invention has achieved the following technical effects compared with the prior art: In the present invention, by using the structural characteristics that the branch interface and the diameter of the non-contracted positioning covered stent are larger than the diameter of the branch covered stent, it is convenient for the branch covered stent to be inserted into the branch interface and the positioning covered stent, reducing the requirement for the corresponding position accuracy between the branch covered stent and the branch interface. And through the radial contraction of the positioning covered stent, the implantation of the branch covered stent can be completed without considering the problem of position deviation between the fracture openings of the branch artery vessels of different patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only 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.

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the aortic covered stent in the embodiment of the present invention; Figure 2 It is a sectional structural schematic diagram of the aortic covered stent in the embodiment of the present invention; Figure 3 It is a three-dimensional structural schematic diagram of the positioning covered stent in the embodiment of the present invention; Figure 4 It is a structural schematic diagram of the constriction rope sleeve in the embodiment of the present invention; Figure 5 It is an internal structural schematic diagram of the base of the constriction rope sleeve (before the limiting rod is cut) in the embodiment of the present invention; Figure 6 It is an internal structural schematic diagram of the base of the constriction rope sleeve (after the rope body is cut) in the embodiment of the present invention; Figure 7 For Figure 6 The partial enlarged view at the base in Figure 8 For Figure 1 The partial enlarged view at the internal stent at the ascending artery end in Figure 9 It is a perspective view of the main body covered stent (at the internal stent at the ascending artery end) in the embodiment of the present invention; Figure 10 It is an internal structural schematic diagram of the main body covered stent before the positioning covered stent contracts in the embodiment of the present invention; Figure 11This is a schematic diagram of the internal structure of the main covered stent during the contraction process of the positioning covered stent in the embodiments of the present invention.

[0018] Description of the reference numerals: 1. Main covered stent; 2. Positioning covered stent; 3. Branch covered stent; 4. Converging rope sleeve; 101. Main cover film; 102. Branch interface; 103. Area to be opened; 104. Inner stent at the ascending artery end; 105. Outer stent at the ascending artery end; 106. Stent at the descending artery end; 107. Bellows section; 108. Arc section; 109. Peak; 201. Conical ring-shaped soft film; 202. Positioning cover film; 203. Positioning stent; 301. Branch cover film; 302. Branch stent; 401. Rope body; 402. Sliding ring; 403. Push rod; 404. Guide ring; 405. Base; 406. First wire groove; 407. Second wire groove; 408. Limiting rod; 409. Reverse teeth; 410. Countersunk hole. Detailed implementation manners

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0020] The purpose of the present invention is to provide an aortic covered stent and an arterial covered stent assembly to solve the problems existing in the prior art. By using the structural characteristics that the diameter of the branch interface and the non-contracted positioning covered stent is larger than the diameter of the branch covered stent, the requirement for the corresponding position accuracy between the branch covered stent and the branch interface is reduced. The branch covered stent can be conveniently inserted into the branch interface and the positioning covered stent, and through the radial contraction of the positioning covered stent, the implantation of the branch covered stent can be completed without considering the position deviation problem existing between the break points of the branch artery vessels of different patients. Since the positioning covered stent can radially contract, there is no need to consider the adaptability of the size of the branch covered stent between the break point of the patient's branch artery vessel and the positioning covered stent.

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0022] Embodiment 1 As Figures 1 to 11As shown, this embodiment provides an aortic stent graft, including a main stent graft 1 and a positioning stent graft 2, and the main stent graft 1 is provided with a branch interface 102 for inserting a branch stent graft 3. The positioning stent graft 2 can shrink radially, and the positioning stent graft 2 is connected to the branch interface 102, and the positioning stent graft 2 is located inside the main stent graft 1. The diameters of the branch interface 102 and the positioning stent graft 2 that is not radially contracted are both larger than the branch stent graft 3. On the one hand, the requirements for the corresponding position accuracy of the branch stent graft 3 and the branch interface 102 are reduced, and on the other hand, the corresponding range of the branch interface 102 is increased to cover the deviation between the fracture positions of the branch blood vessels of different patients, thereby adapting to the fracture positions of the branch blood vessels of different patients. The outer sleeve of the positioning stent graft 2 is provided with a constricting rope loop 4, which can be retracted after being pulled to force the positioning stent graft 2 to be constricted, and the branch stent graft 3 is clamped in the positioning stent graft 2 to complete the implantation.

[0023] Working principle, taking the aortic arch as an example: First, the branch artery of the aortic arch is implanted with a branch stent graft 3, and the guide wire is left in the aortic cavity; then, the main stent graft 1 is anchored between the ascending aorta and the descending aorta, and with the help of the guide wire, the branch interface 102 is aligned with the branch stent graft 3 that has been implanted in the branch artery, so that the positioning stent graft 2 is sleeved on the outside of the branch stent graft 3; then, the constriction rope loop 4 is pulled to close it, forcing the positioning stent graft 2 to be constricted, and the branch stent graft 3 is sleeved and limited, so that the branch stent graft 3 is implanted in the positioning stent graft 2, and the blood flow pathway reconstruction is completed.

[0024] Compared with conventional technical means, during operation, the present aortic stent graft does not need to consider the problem of guide wire selection into the opening of the aortic stent graft, because the branch interface 102 and the non-radially contracted positioning stent graft 2 are directly mounted on the branch stent graft 3, and the diameters of the branch interface 102 and the non-radially contracted positioning stent graft 2 are larger than the branch stent graft 3. Therefore, it is relatively easy to implant the branch stent graft 3 into the branch interface 102 and the non-radially contracted positioning stent graft 2. Subsequently, the requirements for the corresponding position accuracy of the branch blood vessel fracture and the branch interface 102 are relatively low, and there is no need to consider the deviation in the fracture position of the branch artery blood vessels of different patients.

[0025] In addition, the fracture sizes of the branch artery blood vessels of the patient are different, so the diameters of the branch covered stents 3 used are also different. The positioning covered stent 2 of the aortic covered stent can be reduced in diameter. Therefore, as long as the diameter of the branch covered stent 3 is smaller than the initial diameter (before contraction) of the positioning covered stent 2, it can be applicable. Therefore, as long as the initial diameter of the positioning covered stent 2 is made relatively larger, branch covered stents 3 of multiple size specifications can be applicable. For example, if the initial diameter of the positioning covered stent 2 is directly made larger than the diameters of all commonly used branch covered stents 3 on the market currently, all branch covered stents 3 on the market can be applicable. Subsequently, there is no need to consider the size of the fracture and the diameter of the branch covered stent 3 itself, thereby increasing the applicable range of the aortic covered stent.

[0026] In one embodiment, the constriction rope sleeve 4 includes a rope body 401, a guiding ring 404, and an anti-retreat mechanism. A plurality of guiding rings 404 are circumferentially spaced and arranged on the outer wall of the positioning covered stent 2. The rope body 401 includes a sleeved end and a pulling end. The sleeved end sequentially passes through a plurality of guiding rings 404. A sliding ring 402 is fixedly connected to the sleeved end. The sliding ring 402 is sleeved on the rope body 401. The sleeved position of the sleeved end of the rope body 401 to the sliding ring 402 can form an annular sleeve, and the annular sleeve is sleeved on the outer wall of the positioning covered stent 2. The anti-retreat mechanism is used to prevent the sliding ring 402 from moving towards the pulling end. By pulling the pulling end of the rope body 401, the rope body 401 can move along the guiding ring 404 and the sliding ring 402, so that the sleeved position of the sliding ring 402 moves towards the sleeved end, thereby reducing the diameter of the annular sleeve and tightening the positioning covered stent 2.

[0027] In one embodiment, the anti-retraction mechanism includes a push rod 403 and a base 405, wherein a first wire groove 406 and a second wire groove 407 are provided in the base 405, wherein the middle parts of the first wire groove 406 and the second wire groove 407 intersect and communicate with each other, wherein the middle part here only means not the end part, and is not necessarily the midpoint position. The sliding ring 402 is movably arranged in the first wire groove 406, so that the sliding ring 402 moves along the extension direction of the first wire groove 406, and the axis of the sliding ring 402 is perpendicular to the moving direction of the sliding ring 402. One end of the first wire groove 406 is closed, and a stop rod 408 is provided at the closed end of the first wire groove 406, and the stop rod 408 passes through the inner ring of the sliding ring 402. The stop rod 408 presses the outer ring of the sliding ring 402 onto the closed end of the first wire groove 406. A blade is provided on the inner ring of the sliding ring 402, and the stop rod 408 and the rope body 401 can be cut off by the blade. The other end of the first wire groove 406 is provided with a first opening communicating with the outside world. The diameter of the circumscribed circle of the first opening is smaller than the diameter of the sliding ring 402 to prevent the sliding ring 402 from being separated from the first wire groove 406 by the first opening. The second wire groove 407 is provided with a second opening and a third opening communicating with the outside world at both ends. The pulling end of the rope body 401 passes through the first opening, the second opening and the third opening in sequence. The second wire groove 407 is provided with a reverse tooth 409 that can prevent the rope body 401 from moving from the third opening to the second opening. The base 405 is also provided with a countersunk hole 410 communicating with the third opening. One end of the push rod 403 is used to extend into the countersunk hole 410, and the rod diameter of the push rod 403 is larger than the third opening to support the base 405. The other end of the push rod 403 is used to extend out of the main film-covering support 1, and a coaxially arranged hollow channel is provided in the push rod 403, and the pulling end of the rope body 401 extends out of the main film-covering support 1 through the hollow channel. The cutting force required by the blade of the sliding ring 402 to cut off the limit rod 408 is smaller than the radial contraction force of the branch coated bracket 3. At the same time, the cutting force required by the blade of the sliding ring 402 to cut off the limit rod 408 is greater than the cutting force required to cut the rope body 401. The radial contraction force of the positioning coated bracket 2 is smaller than the cutting force required to cut off the limit rod 408.

[0028] Working principle: First, insert the pulling end of the rope body 401 into the hollow channel of the push rod 403 and then pull it out. Then, insert the push rod 403 into the countersunk hole 410 and press against the base 405. Next, pull the pulling end of the rope body 401. The rope body 401 moves along the guiding ring 404, and the sleeved end of the rope body 401 has a tendency to move towards the first opening direction. However, under the limitation of the limiting rod 408, the sleeved end of the rope body 401 does not actually move. At this time, the annular sleeve formed by the rope body 401 will contract, forcing the positioning film stent 2 to contract until the positioning film stent 2 sleeves the branch film stent 3. Continuing to pull the rope body 401, the branch film stent 3 will give a reverse supporting force to the positioning film stent 2. Since the force required for the branch film stent 3 to contract is greater than the cutting force of the limiting rod 408 and the rope body 401, the blade on the inner ring of the sliding ring 402 will cut the limiting rod 408 and the rope body 401 in sequence. Then, pull out the part of the push rod 403 and the rope body 401 connected to the pulling end. The other part of the rope body 401 will not retract under the action of the reverse teeth 409. Therefore, at this time, the rope body 401 will force the positioning film stent 2 to tightly clamp on the outside of the branch film stent 3, completing the implantation of the branch film stent 3 on the main body film stent 1.

[0029] In one embodiment, the base 405 is formed by fastening two half-seats together.

[0030] In one embodiment, the positioning film stent 2 includes a conical ring-shaped soft film 201, a positioning film 202, and a positioning stent 203. The positioning film 202 is tubular, and the positioning stent 203 is used to maintain the tubular shape of the positioning film 202. The large-diameter end of the conical ring-shaped soft film 201 is connected to the branch interface 102, and the diameter of the large-diameter end of the conical ring-shaped soft film 201 matches the diameter of the branch interface 102. The small-diameter end of the conical ring-shaped soft film 201 is connected to the end of the positioning film 202, and the diameter of the small-diameter end of the conical ring-shaped soft film 201 matches the diameter of the positioning film 202. That is, the diameter of the branch interface 102 is larger than the diameter of the positioning film 202. The conical structure of the conical ring-shaped soft film 201 can ensure that the branch film stent 3 can still be inserted into the branch film stent 3 even if the positioning film 202 is not facing correctly, further allowing for corresponding position offsets of the branch blood vessel artery, improving the applicability of the branch interface 102 on the main body film stent 1, and being applicable to the fracture positions of the branch blood vessel arteries of different patients. The positioning stent 203 can be arranged on the outer wall of the positioning film 202 or on the inner wall of the positioning film 202. Specifically, the positioning stent 203 is a corrugated stent, and multiple corrugated stents are arranged at intervals along the extending direction of the positioning film 202.

[0031] In one embodiment, the main body film stent 1 includes a main body film 101 and a main body stent. The main body film 101 is tubular, and the main body stent is used to maintain the tubular shape of the main body film 101. The branch interface 102 is located on the main body film 101.

[0032] In one embodiment, three branch interfaces 102 are provided on the main body covered stent 1, and the three branch interfaces 102 are arranged along the extending direction of the main body covering film 101. A positioning covered stent 2 is provided on each branch interface 102. The three branch interfaces 102 respectively correspond to the positions of the stumps of the innominate artery, the left common carotid artery, and the left subclavian artery.

[0033] Or one branch interface 102 and two to-be-opened areas 103 are provided on the main body covering film 101. The two to-be-opened areas 103 are arranged on both sides of the branch interface 102 along the extending direction of the main body covering film 101, and a positioning covered stent 2 is provided on the branch interface 102. The branch interface 102 corresponds to the position of the stump of the left common carotid artery. Two openings can be manually made in the two to-be-opened areas 103 to respectively correspond to the positions of the innominate artery and the left subclavian artery.

[0034] Or two branch interfaces 102 and one to-be-opened area 103 are provided on the main body covering film 101. The two branch interfaces 102 and one to-be-opened area 103 are arranged along the extending direction of the main body covering film 101, and one of the branch interfaces 102 is located between the to-be-opened area 103 and the other branch interface 102. A positioning covered stent 2 is provided on the branch interface 102. The to-be-opened area 103 can be close to one end of the main body covered stent 1 connected to the descending aorta or close to one end of the main body covered stent 1 connected to the ascending aorta.

[0035] The to-be-opened area 103 can be made into a mesh-like film to facilitate forming an opening by breaking later.

[0036] In one embodiment, the main body membrane 101 is sequentially divided into an ascending artery region and a descending artery region along its extending direction. One end of the ascending artery region far from the descending artery region is used to connect with the ascending aorta, and one end of the descending artery region far from the ascending artery region is used to connect with the descending aorta. The main body stent includes an inner stent 104 at the ascending artery end, an outer stent 105 at the ascending artery end, and a stent 106 at the descending artery end. The numbers of the inner stent 104 at the ascending artery end, the outer stent 105 at the ascending artery end, and the stent 106 at the descending artery end are set according to actual situations. Among them, the inner stent 104 at the ascending artery end is located on the inner wall of one end of the ascending artery region far from the descending artery region. The outer stent 105 at the ascending artery end is arranged on the outer wall of the ascending artery region. The stents 106 at the descending artery end are arranged at intervals on the outer wall of the descending artery region. The outer stent 105 at the ascending artery end is located between the inner stent 104 at the ascending artery end and the stent 106 at the descending artery end. Both the inner stent 104 at the ascending artery end and the outer stent 105 at the ascending artery end are corrugated stents. The transition section between the wave crests 109 and wave troughs of the inner stent 104 at the ascending artery end and the outer stent 105 at the ascending artery end is an arc section 108, and the arc top of the arc section 108 faces away from the descending artery region. The arc section 108 can reduce the compressed volume of the stent, reduce the stimulation of the stent to the inner wall of the blood vessel, and at the same time does not affect the compression performance of the stent. The stent 106 at the descending artery end is also a corrugated stent, but the transition section between the wave crest and the wave trough is a straight line section instead of an arc.

[0037] In one embodiment, both the outer stent 105 at the ascending artery end and the inner stent 104 at the ascending artery end are of four-lobe structures.

[0038] In one embodiment, a telescopic bellows section 107 is provided on the ascending artery region. The number of the bellows sections 107 is set according to needs and is at least one. During the entire blood vessel pulsation cycle, the ascending aorta has a larger pulsation amplitude compared with other segment blood vessels. And due to the relatively large elasticity of the ascending aorta blood vessel itself, a greater axial expansion and contraction is generated during the pulsation process compared with other segment blood vessels. The existence of the bellows section 107 enables the main body membrane 101 to expand and contract along with the pulsation of the ascending aorta to adapt to the axial expansion and contraction generated by the pulsation of the ascending aorta, avoiding the main body membrane 101 from generating wrinkles and affecting the blood flow in the cavity, and avoiding imposing a burden on the axial expansion and contraction of the ascending aorta.

[0039] In one embodiment, there is one inner stent 104 at the ascending artery end, two outer stents 105 at the ascending artery end, and two bellows segments 107. The distance between the two bellows segments 107 is set in the ascending artery region. The bellows segments 107 divide the ascending artery region into three stent installation regions from one end to the other end. The inner stent 104 at the ascending artery end is arranged on the inner wall of the stent installation region far from the descending artery region. The two outer stents 105 at the ascending artery end are arranged on the outer walls of the other two stent installation regions. The peak 109 of the inner stent 104 at the ascending artery end bends towards the central axis of the main body membrane 101. The peak 109 bends inwards (towards the central axis of the main body membrane 101), which is beneficial for cooperation with the delivery device and can avoid scratching the inner wall of the ascending aorta blood vessel.

[0040] Embodiment 2 As Figures 1 to 11 shown, this embodiment provides an arterial covered stent assembly, including a branched covered stent 3 and the aortic covered stent in Embodiment 1. The number of branched covered stents 3 is set according to the number of branched blood vessels reconstructed by the blood flow path, that is, there are as many branched covered stents 3 as there are branched blood vessels with breaks.

[0041] In one embodiment, the branched covered stent 3 includes a branched membrane 301 and a branched stent 302. The branched membrane 301 is tubular, and the branched stent 302 is used to maintain the tubular shape of the branched membrane 301. The branched stent 302 is located inside the branched membrane 301 to avoid cutting the inner wall of the blood vessel.

[0042] In one embodiment, the branched stent 302 is a corrugated stent.

[0043] In one embodiment, the branched covered stent 3 is a balloon-expandable covered stent.

[0044] In one embodiment, the materials used for the main body membrane 101, the conical ring soft membrane 201, the positioning membrane 202, and the branched membrane 301 can refer to the materials commonly used in existing arterial covered stents. The materials used for the inner stent 104 at the ascending artery end, the outer stent 105 at the ascending artery end, the stent 106 at the descending artery end, the positioning stent 203, and the branched stent 302 can refer to the materials commonly used in existing arterial covered stents. It is recommended that the guiding ring 404, the base 405, and the limiting rod 408 adopt medical-grade plastic materials.

[0045] In the present invention, specific examples are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An aortic stent graft, characterized in that: It includes a main coated stent and a radially contractible positioning coated stent, the main coated stent is provided with a branch interface for inserting a branch coated stent, the positioning coated stent is communicated with the branch interface, the positioning coated stent is located inside the main coated stent, the branch interface and the positioning coated stent that is not radially contracted have diameters larger than the branch coated stent, and the outer sleeve of the positioning coated stent is provided with a binding rope loop that can be pulled and retracted.

2. The aortic stent graft according to claim 1, characterized in that: The constricting rope loop includes a guide ring, a rope body and an anti-retreat mechanism. The guide rings are arranged at circumferential intervals on the outer wall of the positioning coating support. The rope body includes a sleeve end and a pulling end. The sleeve end passes through all the guide rings in sequence. A sliding ring is fixedly connected to the sleeve end. The sliding ring is sleeved on the rope body. The anti-retreat mechanism is used to prevent the sliding ring from moving toward the pulling end.

3. The aortic stent graft according to claim 2, characterized in that: The anti-retreat mechanism includes a base and a push rod; a first wire groove and a second wire groove are provided in the base, the middle parts of the first wire groove and the second wire groove intersect and communicate with each other, the sliding ring is movably set in the first wire groove, one end of the first wire groove is closed, and a limiting rod is provided at the closed end of the first wire groove, the limiting rod passes through the inner ring of the sliding ring, and the limiting rod presses the outer ring of the sliding ring on the closed end of the first wire groove, and a blade for cutting off the limiting rod and the rope body is provided on the inner ring of the sliding ring, the other end of the first wire groove is provided with a first opening communicating with the outside world, and the circumscribed circle diameter of the first opening is smaller than the diameter of the sliding ring, and the two ends of the second wire groove are respectively provided with a second opening and a third opening communicating with the outside world, and the pulling end passes through the first opening, the second opening and the second opening in sequence opening and the third opening, the second wire groove is provided with a reverse tooth that can prevent the rope body from moving from the third opening to the second opening; the base is provided with a countersunk hole connected to the third opening, one end of the push rod is used to extend into the countersunk hole, the rod diameter of the push rod is larger than the third opening, the other end of the push rod is used to extend out of the main film-covered bracket, and a coaxially arranged hollow channel is provided in the push rod, and the pulling end of the rope body extends out of the main film-covered bracket from the hollow channel; the cutting force required for the blade of the sliding ring to cut off the limit rod is less than the radial contraction force of the branch film-covered bracket, the cutting force required for the blade of the sliding ring to cut off the limit rod is greater than the cutting force required to cut the rope body, and the radial contraction force of the positioning film-covered bracket is less than the cutting force required to cut off the limit rod.

4. The aortic stent graft according to claim 1, characterized in that: The positioning coating bracket includes a conical ring-shaped soft membrane, a tubular positioning coating and a tubular positioning bracket for maintaining the positioning coating. The large diameter end of the conical ring-shaped soft membrane is connected to the branch interface, and the large diameter end of the conical ring-shaped soft membrane matches the diameter of the branch interface. The small diameter end of the conical ring-shaped soft membrane is connected to the end of the positioning coating, and the small diameter end of the conical ring-shaped soft membrane matches the diameter of the positioning coating.

5. The aortic stent graft according to any one of claims 1 to 4, characterized in that: The main body stent graft comprises a tubular main body graft and a tubular main body stent for maintaining the main body graft, and the branch interface is located on the main body graft.

6. The aortic stent graft according to claim 5, characterized in that: The main body membrane support is provided with three branch interfaces, and the three branch interfaces are arranged along the extension direction of the main body membrane; or the main body membrane is provided with one branch interface and two areas to be opened, and the two areas to be opened are arranged on both sides of the branch interface along the extension direction of the main body membrane; Or two branch interfaces and one area to be opened are provided on the main body coating; the two branch interfaces and one area to be opened are arranged along the extension direction of the main body coating, and one branch interface is located between the area to be opened and the other branch interface.

7. The aortic stent graft according to claim 5, characterized in that: The main body coating is divided into an ascending artery area and a descending artery area in sequence along its extension direction. The main body stent includes an ascending artery end inner stent, an ascending artery end outer stent and a descending artery end stent. The ascending artery end inner stent is located on the inner wall of the ascending artery area away from the descending artery area, the ascending artery end outer stent is arranged on the outer wall of the ascending artery area, the descending artery end stent spacing is arranged on the outer wall of the descending artery area, the ascending artery end outer stent is located between the ascending artery end inner stent and the descending artery end stent, the ascending artery end inner stent and the ascending artery end outer stent are both corrugated stents, the transition section between the crest and the trough of the ascending artery end inner stent and the ascending artery end outer stent is an arc section, and the arc top of the arc section faces away from the descending artery area.

8. The aortic stent graft according to claim 7, characterized in that: The ascending artery region is provided with a retractable bellows section.

9. The aortic stent graft according to claim 8, characterized in that: There is one inner stent at the ascending artery end, two outer stents at the ascending artery end, and two corrugated tube sections. The two corrugated tube sections are arranged on the ascending artery area at a distance. The corrugated tube sections divide the ascending artery area into three stent setting areas from one end to the other end. The inner stent at the ascending artery end is arranged on the inner wall of the stent setting area away from the descending artery area, and two stents at the descending artery end are arranged on the outer walls of the other two stent setting areas. The wave crest of the inner stent at the ascending artery end is bent toward the central axis of the main body coating.

10. An artery covered stent assembly, characterized in that: It comprises a branch stent graft and an aortic stent graft as described in any one of claims 1 to 9.

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