An aortic covered stent and an arterial covered stent assembly

Abstract

The present invention discloses an aortic covered stent and an arterial covered stent assembly, belonging to the technical field of medical stents. It includes a main body covered stent and a positioning covered stent capable of radial contraction. A branch interface for inserting a branch covered stent is provided on the main body covered stent. The positioning covered stent is communicated 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 pulling and retractable restraint rope sleeve is sleeved outside the positioning covered stent. The assembly includes a branch covered stent and the above-mentioned aortic covered stent. By utilizing the structural feature that the diameters of the branch interface and the non-contracted positioning covered stent are larger than that of the branch covered stent, the requirement for the corresponding position accuracy between the branch covered stent and the branch interface can be reduced, the corresponding range of the branch interface can be increased, and the influence brought by the position deviation of the branch artery vessel stumps of different patients can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of medical stents, and in particular 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, and 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 long recovery periods, and are not suitable for elderly patients or those with underlying diseases.

[0003] To reduce 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. The three pre-set interfaces are respectively aligned with the stumps of the three branch arterial vessels (innominate artery, left common carotid artery, left subclavian artery) of the aortic arch. Through a guide wire, the three branched covered stents are selected. It can be selected from the descending aorta to the branch arterial vessels, or from the branch 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 branch arterial vessels. Otherwise, the guide wire cannot be selected. And the stump positions of the branch 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 purpose 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 branch 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 branch interface can be reduced, the corresponding range of the branch interface can be increased, the influence brought by the position deviation of the stumps of the branch 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, including 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 guiding ring, a cord body, and an anti-retreat mechanism. The guiding rings are circumferentially spaced on the outer wall of the positioning covered stent. The cord body includes a sleeved end and a draw end. The sleeved end sequentially passes through all the guiding rings. A sliding ring is fixedly connected to the sleeved end. The sliding ring is sleeved on the cord 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 outer ring of the sliding ring is pressed against the closed end of the first wire groove by the limiting rod. A blade for cutting the limiting rod and the cord 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. A reverse tooth for preventing the cord body from moving from the third opening to the second opening is provided in the second wire groove; a countersunk hole communicating with the third opening is provided on the base. 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 body covered stent. A hollow channel is coaxially arranged in the push rod. The draw end of the cord 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 cord 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 includes a tapered 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 tapered ring-shaped soft film is connected to the branch interface, and the diameter of the large-diameter end of the tapered ring-shaped soft film matches the diameter of the branch interface. The small-diameter end of the tapered ring-shaped soft film is connected to the end of the positioning covered film, and the diameter of the small-diameter end of the tapered ring-shaped soft film matches the diameter of the positioning covered film.

[0009] Preferably, the main body covered stent includes 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 extension 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 arranged on both sides of the branch interface along the extension 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 extension 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 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 end of the ascending artery area far 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 is spaced and 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. Both the ascending artery end inner stent and the ascending artery end outer stent are corrugated stents, and the transition section between the wave crests and wave troughs 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.

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

[0013] Preferably, there is one ascending artery end inner stent, two ascending artery end outer stents, and two corrugated pipe sections. The two corrugated pipe sections are spaced and arranged on the ascending artery area. The corrugated pipe sections divide the ascending artery area into three stent setting areas from one end to the other end. The ascending artery end inner stent is arranged on the inner wall of the stent setting area far from the descending artery area, and the two descending artery end stents are arranged on the outer walls of the other two stent setting areas. The wave crest of the ascending artery end inner stent bends 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:

[0016] In the present invention, by using the structural characteristics that the branch interface and the diameter of the unshrunk 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 shrinkage of the positioning covered stent, the implantation of the branch covered stent can be completed without considering the problem of the position deviation between the fracture ends of the branch artery blood vessels of different patients. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 It is a three-dimensional structural schematic diagram of the aortic covered stent in the embodiment of the present invention;

[0019] Figure 2 It is a sectional structural schematic diagram of the aortic covered stent in the embodiment of the present invention;

[0020] Figure 3 It is a three-dimensional structural schematic diagram of the positioning covered stent in the embodiment of the present invention;

[0021] Figure 4 It is a structural schematic diagram of the constriction rope sleeve in the embodiment of the present invention;

[0022] 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;

[0023] 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;

[0024] Figure 7 For Figure 6 a partial enlarged view at the base in

[0025] Figure 8 For Figure 1 a partial enlarged view at the ascending artery end inner stent in

[0026] Figure 9Perspective view of the main body covered stent (at the inner stent of the ascending artery end) in the embodiment of the present invention;

[0027] Figure 10 Internal structural schematic diagram of the main body covered stent before the positioning covered stent shrinks in the embodiment of the present invention;

[0028] Figure 11 Internal structural schematic diagram of the main body covered stent during the shrinking process of the positioning covered stent in the embodiment of the present invention.

[0029] Explanation of reference numerals:

[0030] 1. Main body covered stent; 2. Positioning covered stent; 3. Branch covered stent; 4. Retaining rope sleeve;

[0031] 101. Main body covering 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. Wave crest;

[0032] 201. Conical ring-shaped soft film; 202. Positioning covering film; 203. Positioning stent;

[0033] 301. Branch covering film; 302. Branch stent;

[0034] 401. Rope body; 402. Sliding ring; 403. Push rod; 404. Guide ring; 405. Base; 406. First wire groove; 407. Second wire groove; 408. Limit rod; 409. Reverse teeth; 410. Countersunk hole. Detailed implementation manners

[0035] 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.

[0036] The object of the present invention is to provide an aortic stent graft and an arterial stent graft assembly to solve the problems existing in the prior art. The structural feature that the diameter of the branch interface and the uncontracted positioning stent graft is larger than the diameter of the branch stent graft is utilized to reduce the requirements for the corresponding position accuracy of the branch stent graft and the branch interface. The branch stent graft can be easily inserted into the branch interface and the positioning stent graft, and the implantation of the branch stent graft can be completed by radial contraction of the positioning stent graft. There is no need to consider the problem of position deviation between the fractures of the branch arteries of different patients. The positioning stent graft can be radially contracted, so there is no need to consider the adaptability of the size of the branch stent graft between the fracture of the patient's branch artery and the positioning stent graft.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1

[0039] like Figures 1 to 11 As 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.

[0040] Working principle, taking the aortic arch as an example:

[0041] 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.

[0042] Compared with conventional technical means, when operating this aortic covered stent, there is no need to consider the problem of guiding wire selection into the opening of the aortic covered stent. Because the branch interface 102 and the non-radially contracted positioning covered stent 2 are directly sleeved on the branch covered stent 3, and the diameters of the branch interface 102 and the non-radially contracted positioning covered stent 2 are both larger than that of the branch covered stent 3. Therefore, it is relatively easy to implant the branch covered stent 3 into the branch interface 102 and the non-radially contracted positioning covered stent 2. Subsequently, the requirement for the corresponding position accuracy between the fracture of the branch blood vessel and the branch interface 102 is relatively low, and there is no need to consider the problem of deviation in the fracture position of the branch artery blood vessels of different patients.

[0043] In addition, the fracture sizes of the branch artery blood vessels of patients are different, so the diameters of the branch covered stents 3 used are also different. And the positioning covered stent 2 of the aortic covered stent can be reduced in diameter. Therefore, as long as the branch covered stent 3 has a diameter 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, by directly making the initial diameter of the positioning covered stent 2 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.

[0044] In one embodiment, the retraction rope sleeve 4 includes a rope body 401, a guide ring 404, and an anti-retreat mechanism. A plurality of guide 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 guide 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 guide 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.

[0045] 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.

[0046] Working principle:

[0047] 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. Then 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 successively cut the limiting rod 408 and the rope body 401. Then pull out the push rod 403 and the part of 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.

[0048] In one embodiment, the base 405 is formed by fixing two half-seats to each other by buckling.

[0049] 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 it directly, further allowing for corresponding position offsets of the branch blood vessel arteries, 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.

[0050] 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.

[0051] In one embodiment, three branch interfaces 102 are provided on the main body covered stent 1. The three branch interfaces 102 are arranged along the extension direction of the main body film 101, and 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.

[0052] Or, one branch interface 102 and two to-be-opened areas 103 are provided on the main body film 101. The two to-be-opened areas 103 are arranged on both sides of the branch interface 102 along the extension direction of the main body 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, and 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.

[0053] Or, two branch interfaces 102 and one to-be-opened area 103 are provided on the main body film 101. The two branch interfaces 102 and the one to-be-opened area 103 are arranged along the extension direction of the main body 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.

[0054] The to-be-opened area 103 can be made into a mesh-like film to facilitate later breaking to form an opening.

[0055] 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 to the ascending aorta, and one end of the descending artery region far from the ascending artery region is used to connect to 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 peaks 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 on 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 peaks and wave troughs is a straight line section instead of an arc.

[0056] In one embodiment, both the outer stent 105 at the ascending artery end and the inner stent 104 at the ascending artery end are four-lobe structures.

[0057] 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 larger axial expansion and contraction is generated compared with other segment blood vessels during the pulsation process. The existence of the bellows section 107 enables the main body membrane 101 to expand and contract with the pulsation of the ascending aorta to adapt to the axial expansion and contraction generated by the pulsation of the ascending aorta, avoiding wrinkles on the main body membrane 101 from affecting the blood flow in the cavity and avoiding burden on the axial expansion and contraction of the ascending aorta.

[0058] In one embodiment, there is one inner ascending artery stent 104, two outer ascending artery stents 105, and two corrugated pipe segments 107. The two corrugated pipe segments 107 are spaced on the ascending artery region, and the corrugated pipe segments 107 divide the ascending artery region into three stent installation regions from one end to the other end. The inner ascending artery stent 104 is arranged on the inner wall of the stent installation region far from the descending artery region. The two outer ascending artery stents 105 are arranged on the outer walls of the other two stent installation regions. The wave crest 109 of the inner ascending artery stent 104 bends towards the central axis of the main body membrane 101, and the wave crest 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.

[0059] Embodiment 2

[0060] 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 for blood flow path reconstruction, that is, there are as many branched covered stents 3 as there are branched blood vessels with breaks.

[0061] 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.

[0062] In one embodiment, the branched stent 302 is a corrugated stent.

[0063] In one embodiment, the branched covered stent 3 is a balloon-expandable covered stent.

[0064] In one embodiment, the materials used for the main body membrane 101, the conical ring-shaped 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 ascending artery stent 104, the outer ascending artery stent 105, the descending artery stent 106, 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.

[0065] In the present invention, specific examples are used to elaborate on the principle and implementation mode 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 mode 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 covered stent, characterized in that, It comprises a main stent graft and a positioning stent graft capable of radial contraction, the main stent graft is provided with a branch interface for inserting a branch stent graft, the positioning stent graft is communicated with the branch interface, the positioning stent graft is located inside the main stent graft, the diameters of the branch interface and the positioning stent graft that is not radially contracted are both larger than the branch stent graft, and the outer sleeve of the positioning stent graft is provided with a constricting rope loop that can be pulled and retracted; The drawstring rope loop comprises a guide ring, a rope body and an anti-backward mechanism, the guide rings are arranged on the outer wall of the positioning film-covering bracket at circumferential intervals, the rope body comprises a sleeve end and a pulling end, the sleeve end passes through all the guide rings in sequence, the sleeve end is fixedly connected to a sliding ring, the sliding ring is sleeved on the rope body, and the anti-backward mechanism is used to prevent the sliding ring from moving toward the pulling end; the anti-backward mechanism comprises a base and a push rod; a first wire groove and a second wire groove are arranged in the base, the middle parts of the first wire groove and the second wire groove are crossed and communicated, the sliding ring is movably arranged in the first wire groove, one end of the first wire groove is closed, and a limiting rod is arranged 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 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 communicated with the outside world, and the outer The diameter of the connecting circle 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 that are connected to the outside world, and the pulling end passes through the first opening, the second opening and the third opening in sequence, and 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, and 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 off 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.

2. The aortic covered stent according to claim 1, wherein 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.

3. The aortic covered stent according to claim 1 or 2, characterized in that, The main body covered stent includes a tubular main body covering film and a tubular main body stent for maintaining the main body covering film, and the branch interface is located on the main body covering film.

4. The aortic covered stent according to claim 3, characterized in that, There are three branch interfaces on the main body covered stent, and the three branch interfaces are arranged along the extending direction of the main body covering film; or there is one branch interface and two to-be-opened areas on the main body covering film, and the two to-be-opened areas are arranged on both sides of the branch interface along the extending direction of the main body covering film; or there are two branch interfaces and one to-be-opened area on the main body covering film; the two branch interfaces and one to-be-opened area are arranged along the extending direction of the main body covering film, and one of the branch interfaces is located between the to-be-opened area and the other branch interface.

5. The aortic covered stent according to claim 4, wherein The main body covering film is sequentially divided into an ascending artery area and a descending artery area along its extending 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 one end of the ascending artery area far 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 is spaced and 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. Both the ascending artery end inner stent and the ascending artery end outer stent are corrugated stents. The transition section between the wave crests and wave troughs 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.

6. The aortic covered stent according to claim 5, characterized in that, There is an expandable corrugated pipe section on the ascending artery area.

7. The aortic covered stent according to claim 6, wherein There is one ascending artery end inner stent, two ascending artery end outer stents, and two corrugated pipe sections. The two corrugated pipe sections are spaced and 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 ascending artery end inner stent is arranged on the inner wall of the stent arrangement area far from the descending artery area. The two descending artery end stents are arranged on the outer walls of the other two stent arrangement areas. The wave crest of the ascending artery end inner stent bends towards the central axis of the main body covering film.

8. An arterial covered stent assembly, characterized in that, It includes a branch covered stent and the aortic covered stent according to any one of claims 1-7.

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