Multi-branch intravascular stent assembly

Abstract

The utility model relates to the technical field of medical instruments, in particular to a multi-branch intravascular stent assembly which comprises a stent body and a blood vessel strap, and the stent body comprises a first main blood vessel, a second main blood vessel, a first branch, a second branch, a third branch, a fourth branch and a supporting ring. The first branch and the fourth branch are connected with the outer side wall of the near end of the first main blood vessel and communicated with the first main blood vessel. The second branch and the third branch are connected with the side wall of the second main blood vessel and communicated with the second main blood vessel. The far end of the first main blood vessel is connected and communicated with the near end of the second main blood vessel; a flange edge is annularly arranged on the outer side wall of the far end of the first main blood vessel, and a supporting ring is annularly arranged on the outer side wall of the near end of the second main blood vessel. According to the intravascular stent assembly, the time of profound hypothermia circulatory arrest is greatly shortened, brain injury and organ injury to a patient are reduced, the application range of the intravascular stent assembly is greatly expanded, and the intravascular stent assembly can be better matched with branch blood vessels of the patient.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, in particular to a multi-branched blood vessel stent assembly. Background Art

[0002] Stanford type A aortic dissection, or aortic aneurysm involving the aortic arch, has long been one of the most complex and risky conditions in cardiovascular surgery. Currently, the mainstream treatment for this condition is the "Sun's Procedure," developed by Professor Sun Lizhong.

[0003] The "Sun's operation" has solved the problem of treating the aortic arch, but it also has problems such as more anastomosis during the operation, longer cardiac arrest time, and greater damage to the patient. To solve this problem, the current method is to implant a stent with three branches during the operation. The stent (such as Figure 1 ) typically comprises a segment of an artificial blood vessel 31, a self-expanding vascular stent 11 sutured to the artificial blood vessel, and three branch stents 21 connected to the self-expanding vascular stent using a soft membrane. This intraoperative stent can significantly reduce the time required to anastomose the branch stent 21 with the three branches of the aortic arch (the brachiocephalic trunk, the left common carotid artery, and the left subclavian artery). However, because the artificial blood vessel 31 of this intraoperative stent still needs to be anastomosed to the patient's vascular stump, and this process is performed under deep hypothermic circulatory arrest, this can result in a prolonged deep hypothermic circulatory arrest period, increasing the incidence of brain damage and postoperative complications. Furthermore, the position, diameter, and height of the three branches of this intraoperative stent are relatively fixed, while the size and position of each patient's branch vessels vary, especially the numerous branches of the innominate artery, which presents a high degree of variation. Therefore, matching the branch stents of this intraoperative stent with the patient's branch vessels is difficult, and customized stents are not suitable for emergency surgery. Therefore, this intraoperative stent has a limited scope of clinical application. Utility Model Content

[0004] The present invention addresses the problems in the prior art and provides a multi-branch vascular stent assembly. Compared with the prior art, the present invention greatly reduces the time of deep hypothermic circulatory arrest and reduces brain damage and organ damage to the patient. At the same time, since the first branch, the second branch, and the third branch all have freely movable ports, the adaptability of the vascular stent assembly of the present invention is greatly expanded, and it can better match the patient's branch blood vessels.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The utility model provides a multi-branched blood vessel stent assembly, which includes a stent body and a blood vessel band, wherein the stent body includes a first main blood vessel, a second main blood vessel, a first branch, a second branch, a third branch, a fourth branch and a support ring, wherein the first branch and the fourth branch are respectively connected to the proximal outer side wall of the first main blood vessel and communicate with the first main blood vessel, and the second branch and the third branch are respectively connected to the side wall of the second main blood vessel and communicate with the second main blood vessel;

[0007] The distal end of the first main blood vessel is connected and communicated with the proximal end of the second main blood vessel; a flange is provided around the outer wall of the distal end of the first main blood vessel, and the support ring is provided around the outer wall of the proximal end of the second main blood vessel;

[0008] The vascular band includes a band body and a buckle for fixing the band body. The band body is used to cover the outer circumference of the support ring.

[0009] The first branch and the fourth branch are arranged at an angle of 90°, and the minimum distance between the first branch and the fourth branch is greater than 10 mm.

[0010] The proximal end of the first main blood vessel is a free end, and the diameter of the first main blood vessel is D1, wherein 20 mm ≤ D1 ≤ 42 mm.

[0011] The distance between the outer edge of the flange and the outer wall of the first main blood vessel is L1, wherein 12 mm ≤ L1 ≤ 25 mm.

[0012] In which, the second main blood vessel is a hollow tubular structure; the proximal end of the second main blood vessel is provided with a variable diameter structure portion, the variable diameter structure portion includes a middle section and a conducting section provided at both ends of the middle section, the diameter of the conducting section is D2, and the diameter of the middle section is D3, wherein D2≤D3≤1.5*D2; the distal diameter of the second main blood vessel is D4, wherein 0mm≤D2-D4<6mm.

[0013] Wherein, the second main blood vessel includes a polymer membrane and a metal corrugated ring with deformation recovery capability; the metal corrugated ring is arranged on the inner side and / or the outer side of the polymer membrane.

[0014] Wherein, the second main blood vessel includes a polymer membrane and a metal corrugated ring with deformation recovery capability; the polymer membrane is arranged on the inner side and / or the outer side of the metal corrugated ring.

[0015] A sewing edge is further extended from the distal end of the polymer film, and the length of the sewing edge is L2, wherein 2mm≤L2≤10mm.

[0016] Among them, the support ring is made of a material with deformation recovery ability; the diameter of the support ring is the same as the diameter of the middle section, the length of the support ring is L3, among which 10mm≤L3≤25mm, and the support ring is sleeved on the outer wall or inner wall of the middle section.

[0017] Among them, the vascular band also includes a sealing strip and a ring. Semi-closed circular cavities are provided on both sides of the band body. The sealing strip is installed in the circular cavity. The ring is provided at one end of the band body. The band body is wrapped around the outer circumference of the support ring. The other end of the band body is wrapped around the support ring and then passed through the ring and then stacked in reverse on the outer wall of the band body. The buckle is used to fix the stacked band bodies.

[0018] Beneficial effects of the utility model:

[0019] When the utility model is used, the various parts of the vascular stent assembly are compressed on the delivery system. During the surgical thoracotomy, under the condition of deep hypothermic circulatory arrest, the heart is stopped, the patient's aorta is cut open, and the vascular stent assembly is implanted into the aorta through the delivery system, wherein the second main blood vessel is implanted into the aortic arch and the descending aorta, the second branch and the third branch are implanted into the left common carotid artery and the left subclavian artery respectively, and the proximal end of the second main blood vessel is implanted into the aorta between the innominate artery and the left common carotid artery, or the aorta proximal to the innominate artery. At this time, the patient's blood vessels are The stump is wrapped around the outside of the entire second main blood vessel; a vascular band is used to bind the patient's blood vessel stump and the support ring outside the support ring together, and the diameter of the support ring is shrunk, that is, the diameter of the support ring after shrinkage is the same as the diameter of the proximal end of the second main blood vessel; then the perfusion tube of the extracorporeal circulation is connected to the fourth branch, so that the patient's lower limb blood circulation and cerebral vascular perfusion can be restored, and finally the proximal opening of the first main blood vessel is connected to the patient's ascending aorta, the first branch is connected to the patient's innominate artery, and the flange is used to wrap and suture the opening of the patient's blood vessel stump, and the operation is completed. Compared with the prior art, the present invention greatly reduces the time of deep hypothermic circulatory arrest and reduces brain damage and organ damage to the patient. At the same time, because the first branch, the second branch, and the third branch all have freely movable ports, the adaptability of the vascular stent assembly of the embodiment of the present application is greatly expanded, and it can better match the patient's branch blood vessels. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of an intraoperative stent in the prior art.

[0021] Figure 2 This is a schematic structural diagram of a multi-branched blood vessel stent assembly of the present invention.

[0022] Figure 3This is a schematic structural diagram of the vascular band of the present invention.

[0023] Figure 4 This is a schematic structural diagram of the vascular band of the present invention from another perspective.

[0024] Figure 5 It is a schematic structural diagram of the cooperation between the tie belt body and the sealing strip of the present invention.

[0025] Figure 6 This is a schematic diagram of the distribution structure of the first main blood vessel, the first branch and the fourth branch of the present invention.

[0026] Figure 7 This is a schematic structural diagram of the flange edge and the first main blood vessel of the present invention.

[0027] Figure 8 This is a cross-sectional view of the second main blood vessel of the present invention.

[0028] Figure 9 for Figure 8 Enlarged view of point A.

[0029] Figure 10 for Figure 8 Enlarged view of point B.

[0030] Figure 11 This is a schematic structural diagram of the polymer film and metal corrugated ring of the second main blood vessel of the present invention.

[0031] Figure 12 It is a schematic structural diagram of the cooperation between the variable diameter structure part and the support ring of the utility model.

[0032] Figure 13 It is a structural schematic diagram of the buckle of the present invention when it is opened.

[0033] Figure 14 It is a schematic structural diagram of the buckle of the present invention when it is closed.

[0034] Figure 15 This is a schematic structural diagram of the cooperation between the vascular band and the support ring of the present invention.

[0035] Figure 16 Schematic diagram of the structure in which the patient's vascular stump is wrapped around the entire second main blood vessel.

[0036] Figure 17 This is a structural schematic diagram of the utility model using a vascular band to bind the patient's vascular stump outside the support ring and the support ring together.

[0037] Figure 18 This is a schematic diagram of the structure of using a flange edge to wrap and suture the opening of a patient's blood vessel stump.

[0038] exist Figures 1 to 18 Reference numerals in the figures include:

[0039] 1. First branch; 2. First main vessel; 3. Flange; 4. Support ring; 5. Second branch; 6. Third branch; 7. Second main vessel; 8. Fourth branch; 9. Band body; 10. Sealing strip; 11. Ring; 12. Buckle;

[0040] 70. Metal corrugation; 71. Polymer film; 72. Metal rod; 73. Sewn edge;

[0041] 120. Movable rod; 121. Fixed rod. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. It is understood that the drawings are only provided for reference and illustration purposes and are not used to limit the present invention. The connection relationship shown in the drawings is only for the convenience of clear description and does not limit the connection method.

[0043] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be an intermediate component at the same time. Unless otherwise defined, all technical and scientific terms used in this document have the same meaning as those generally understood by technicians in the technical field of the present invention. It should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The terms used in this document in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0044] It should also be noted that in the description of the present invention, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Example 1

[0045] like Figures 1 to 18 As shown, a multi-branched blood vessel stent assembly includes a stent body and a blood vessel band, the stent body includes a first main blood vessel 2, a second main blood vessel 7, a first branch 1, a second branch 5, a third branch 6, a fourth branch 8 and a support ring 4, the first branch 1 and the fourth branch 8 are respectively connected to the proximal outer wall of the first main blood vessel 2 and communicate with the first main blood vessel 2, the second branch 5 and the third branch 6 are respectively connected to the side wall of the second main blood vessel 7 and communicate with the second main blood vessel 7; wherein the first main blood vessel 2, the second main blood vessel 7, the first branch 1, the second branch 5, the third branch 6, and the fourth branch 8 are all hollow tubular structures;

[0046] The upper end opening of the first branch 1 is a free movable end, and the lower end opening of the first branch 1 is connected to the first main blood vessel 2. The two can be sutured together or woven into an integral body. The lower end opening of the first branch 1 is connected to the first main blood vessel 2 to ensure that when blood flows through the first main blood vessel 2, part of the blood flow can flow to the first branch 1.

[0047] The fourth branch 8 is similar to the first branch 1. One end of the fourth branch 8 is a freely movable port, and the other end of the fourth branch 8 is connected to the first main blood vessel 2. The two can be sutured together or woven into an integral shape. The fourth branch 8 is connected to the first main blood vessel 2 to ensure that blood can flow from the freely movable port of the fourth branch 8 to the lumen of the first main blood vessel 2.

[0048] The upper end of the second branch 5 is a free movable end, and the lower end of the second branch 5 is connected to the side wall of the second main blood vessel 7, and the lumens of the two are completely connected, so as to ensure that blood flows through the interior of the second branch 5 when blood flows through the second main blood vessel 7;

[0049] The upper end of the third branch 6 is a free movable end, and the lower end of the third branch 6 is connected to the side wall of the second main blood vessel 7, and the lumens of the two are completely connected, so as to ensure that blood flows through the interior of the third branch 6 when blood flows through the second main blood vessel 7;

[0050] The distal end of the first main vessel 2 is connected to and communicates with the proximal end of the second main vessel 7; a flange 3 is provided around the distal outer wall of the first main vessel 2, and a support ring 4 is provided around the proximal outer wall of the second main vessel 7; the first main vessel 2 is a hollow tubular structure, and the proximal opening of the first main vessel 2 is a free, movable end. The distal opening of the first main vessel 2 is connected to and communicates with the proximal opening of the second main vessel 7;

[0051] The vascular band includes a band body 9 and a buckle 12 for fixing the band body 9 . The band body 9 is used to wrap around the outer circumference of the support ring 4 .

[0052] Specifically, when the present invention is used, the various parts of the vascular stent assembly are compressed on the delivery system. During surgical thoracotomy, under deep hypothermic circulatory arrest conditions, the heart is stopped, the patient's aorta is cut open, and the vascular stent assembly is implanted into the aorta through the delivery system, wherein the second main blood vessel 7 is implanted into the aortic arch and the descending aorta, the second branch 5 and the third branch 6 are implanted into the left common carotid artery and the left subclavian artery respectively, and the proximal end of the second main blood vessel 7 is implanted into the aorta between the innominate artery and the left common carotid artery, or the aorta proximal to the innominate artery. At this time, the patient's vascular stump is wrapped around the outside of the entire second main blood vessel 7, as shown in FIG. Figure 16 As shown; use a vascular band to bind the patient's blood vessel stump and the support ring 4 outside the support ring 4 together, and shrink the diameter of the support ring 4, that is, after shrinkage, the diameter of the support ring 4 is the same as the diameter of the proximal end of the second main blood vessel 7, as Figure 17 As shown; then the extracorporeal circulation perfusion tube is connected to the fourth branch 8 to restore the patient's lower limb blood circulation and cerebral perfusion. Finally, the proximal opening of the first main blood vessel 2 is connected to the patient's ascending aorta, the first branch 1 is connected to the patient's innominate artery, and the opening of the patient's vascular stump is wrapped and sutured using the flange 3, and the operation is completed. Figure 18 Compared with the prior art, the embodiment of the present application greatly reduces the duration of deep hypothermic circulatory arrest, thereby reducing brain damage and organ damage to the patient. Furthermore, since the first branch 1, the second branch 5, and the third branch 6 all have freely movable ports, the adaptability of the vascular stent assembly of the embodiment of the present application is greatly expanded, and it can better match the patient's branch blood vessels.

[0053] In the embodiment of the present application, the material of the first branch 1 is preferably stretchable polyethylene terephthalate (PET). In its natural state, it is at its original length. Under extremely small tension, the first branch 1 can achieve an elongation of 100%-300%; the inner and outer surfaces of the first branch 1 can be optionally coated with a blood-proof coating; the material of the first branch 1 can also be polytetrafluoroethylene (PTFE); there is no metal support on the inner and / or outer sides of the first branch 1 to ensure that the first branch 1 has better freedom and can swing flexibly; the diameter of the first branch 1 is usually 8mm, 10mm, 12mm, 14mm, and 16mm to choose from, and the length is greater than 100mm. More diameter options and longer length can ensure that the first branch 1 has greater freedom. Even if there are many variations in the patient's innominate artery, the first branch 1 can still be well matched with the patient's innominate artery.

[0054] In the embodiment of the present application, the first branch 1 and the fourth branch 8 are arranged at an angle of 90°, and the minimum distance between the first branch 1 and the fourth branch 8 is greater than 10 mm; the material and structure of the fourth branch 8 are consistent with those of the first branch 1, but the size is somewhat different from that of the first branch 1. The diameter of the fourth branch 8 is preferably 10 mm and the length is greater than 100 mm; the fourth branch 8 and the first branch 1 are distributed at 90° in the circumferential direction of the first main blood vessel 2, such as Figure 6 As shown; viewed in the axial direction of the first main vessel 2, the first branch 1 is closer to the proximal end of the first main vessel 2, while the minimum distance between the fourth branch 8 and the first branch 1 is greater than 10 mm.

[0055] In the embodiment of the present application, the proximal end of the first main blood vessel 2 is a free movable end, and the diameter of the first main blood vessel 2 is D1, wherein 20mm≤D1≤42mm. The material of the first main blood vessel 2 is preferably stretchable PET. In its natural state, it is at its original length. Under extremely small tension, the first main blood vessel 2 can achieve an elongation of 100%-300%; the inner and outer surfaces of the first main blood vessel 2 can be optionally coated with a blood-proof coating; the diameter size of the first main blood vessel 2 is D1, and the range of D1 is 20mm-42mm.

[0056] In an embodiment of the present application, the distance between the outer edge of the flange 3 and the outer wall of the first main blood vessel 2 is L1, where 12mm≤L1≤25mm; the flange 3 is annular and nested on the outside of the first main blood vessel 2. The material of the flange 3 is preferably PET, but it can also be PTFE or other polymer materials.

[0057] In the embodiment of the present application, the second main blood vessel 7 is a hollow tubular structure; the proximal end of the second main blood vessel 7 is provided with a diameter-changing structure portion, that is, Figure 9In the structure shown, the variable diameter structure portion includes a middle section and conductive sections arranged at both ends of the middle section. Under the above setting, the variable diameter structure portion is "spindle-shaped" with equal diameters at both ends; the diameter of the conductive section is D2, and the diameter of the middle section is D3, wherein D2≤D3≤1.5*D2; the distal diameter of the second main blood vessel 7 is D4, wherein 0mm≤D2-D4<6mm.

[0058] In the embodiment of the present application, the second main blood vessel 7 includes a polymer film 71 and a metal wave ring 70 with deformation recovery ability; the metal wave ring 70 is arranged on the inner side or / and outer side of the polymer film 71; the metal wave ring 70 can be provided in plurality, and the plurality of metal wave rings 70 are arranged in a row at equal intervals along the length direction of the second main blood vessel 7. The metal wave ring 70 can be woven from metal wires with shape memory function, or cut from metal pipes with shape memory function. After undergoing different metal heat treatments, they have similar functions, that is, they can be compressed to a state where the diameter is much smaller than the patient's blood vessel diameter at a certain temperature. After being released during the operation, they automatically expand to their original state to ensure that the blood flow can pass smoothly in the second main blood vessel 7; the metal wave ring 70 is arranged from the right side of the variable diameter structure to the distal end of the second main blood vessel 7. They are independent of each other and can move freely axially to ensure that the blood flow can pass smoothly in the second main blood vessel 7. This ensures that the second main blood vessel 7 has good flexibility; the polymer membrane 71 is usually made of PET or PTFE membrane, and the second main blood vessel 7 including the polymer membrane 71 of the variable diameter structure at its proximal end is an integrated structure; the metal wave ring 70 is on the inner or outer side of the polymer membrane 71, or is arranged on the inner and outer sides of the polymer membrane 71 at the same time, or the polymer membrane 71 is arranged on both sides of the metal wave ring 70, and the whole presents a "sandwich" structure; the polymer membrane 71 and the metal wave ring 70 are tightly attached together; the connection between the polymer membrane 71 and the metal wave ring 70 is generally carried out by suturing or high-temperature firing.

[0059] In the embodiment of the present application, the distal end of the polymer film 71 is further extended with a suture edge 73, and the length of the suture edge 73 is L2, wherein 2mm≤L2≤10mm; at the distal end of the second main blood vessel 7, the length of the polymer film 71 exceeds the length of the metal corrugated ring 70, i.e., the suture edge 73, as shown in FIG. Figure 11 As shown, the length L2 of the suture edge 73 is 2 mm to 10 mm, so that blood vessels can be anastomosed at this position during a secondary operation.

[0060] In the embodiment of the present application, the support ring 4 is made of a material with deformation recovery ability; the diameter of the support ring 4 is the same as the diameter of the middle section, the length of the support ring 4 is L3, wherein 10mm≤L3≤25mm, and the support ring 4 is sleeved on the outer peripheral wall or the inner peripheral wall of the middle section. Specifically, the support ring 4 is a ring-shaped structure with a self-expanding function, such as Figure 12 As shown, similar to the metal corrugated ring, the support ring 4 can also be woven from metal wires with shape memory function, or cut from metal tubes with shape memory function; the diameter of the support ring 4 is consistent with the diameter of the middle section of the variable diameter structure, both of which are D3; its length L3 ranges from 10mm to 25mm; the position where the support ring 4 is set is usually in the middle section of the variable diameter structure of the second main blood vessel 7, on the inner side of the polymer membrane of the second main blood vessel 7 or using a polymer membrane to cover the support ring 4 in the middle, forming a "sandwich" structure.

[0061] In this embodiment, the composition and material of the second branch 5 are related to the second main vessel 7. When the polymer membrane of the second main vessel 7 is PET, the second branch 5 preferably comprises PET and a metal corrugation ring, with the metal corrugation ring disposed on the outside or inside of the PET membrane. Alternatively, the second branch 5 may be made of retractable PET, and the second branch 5 and the second main vessel 7 are connected by sutures. When the polymer membrane of the second main vessel 7 is PTFE, the second branch 5 comprises the PTFE membrane and the metal corrugation ring, and the second branch 5 and the polymer membrane of the second main vessel 7 are integrally formed by firing, with the polymer membrane of the second branch 5 disposed on both the inside and outside of the metal corrugation ring, forming an overall "sandwich" structure. The diameter of the second branch 5 ranges from 8 mm to 16 mm, and the length ranges from 20 mm to 40 mm.

[0062] In this embodiment, the composition and material of the third branch 6 are related to the second main vessel 7. When the polymer membrane of the second main vessel 7 is PET, the third branch 6 preferably comprises PET and a metal corrugation ring, with the metal corrugation ring disposed on the outside or inside of the PET membrane of the third branch 6. In this case, the third branch 6 and the second main vessel 7 are connected by sutures. When the polymer membrane of the second main vessel 7 is PTFE, the third branch 6 comprises the PTFE membrane and the metal corrugation ring. In this case, the third branch 6 and the polymer membrane of the second main vessel 7 are integrally formed by firing, with the polymer membrane of the third branch 6 disposed on the inside and outside of the corrugation ring of the third branch 6, forming an overall "sandwich" structure. The diameter of the third branch 6 ranges from 8 mm to 16 mm, and the length ranges from 20 mm to 40 mm. The third branch 6 differs from the second branch 5 in that the second branch 5 is closer to the proximal end of the second main vessel 7, while the third branch 6 is closer to the distal end. The minimum distance between the second branch 5 and the third branch 6 ranges from 0 mm to 15 mm.

[0063] In an embodiment of the present application, the vascular band further includes a sealing strip 10 and a ring 11. Semi-enclosed circular cavities are provided on both sides of the band body 9, and the sealing strip 10 is installed in the circular cavity. The ring 11 is provided at one end of the band body 9. The band body 9 is wrapped around the outer periphery of the support ring 4, and the other end of the band body 9 is wrapped around the support ring 4 and then passed through the ring 11 and then reversely stacked on the outer wall of the band body 9. The buckle 12 is used to fix the stacked band bodies 9; wherein the band body 9 is a soft polymer material, commonly used materials such as PET, PTFE, etc.

[0064] Specifically, a semi-enclosed circular cavity is provided on both sides of the strap body 9, and a sealing strip 10 passes through the circular cavity. The sealing strip 10 is a solid rod-shaped structure, and the preferred material is silicone. The length of the sealing strip 10 is equal to that of the strap body 9. The positional relationship between the two is as follows: Figures 3 to 5 The length of the strap is 15cm-20cm, and the required length can be adjusted adaptively according to the diameter of the support ring 4 when in use.

[0065] Among them, a loop 11 is provided at one end of the band body 9. The loop 11 is a quadrilateral, closed ring structure. One side of the loop 11 is fixedly connected to one end of the band body 9. Preferably, the two sides adjacent to the side where the loop 11 is connected to the band body 9 are arc-shaped sides. When the vascular band is used, the center of the circle corresponding to the arc-shaped side of the loop 11 should face the center line of the blood vessel so that the loop 11 can better fit the blood vessel wall.

[0066] Among them, the buckle 12 is used to clamp the folded and stacked bands together to prevent them from slipping, so that the vascular band is tightly bound to the vascular stump and the outer wall of the vascular stent. The buckle 12 can be made of a material with good elasticity, such as stainless steel, spring steel, etc. We use this design to enable the buckle 12 to clamp the band.

[0067] as follows Figures 13 to 15 As shown, the buckle 12 includes a movable rod 120 and a fixed rod 121. The left side of the fixed rod 121 is a semi-closed circular ring. The distance from the opening of the circular ring to the fixed rod 121 is L. The right side of the fixed rod 121 is connected to the right side of the movable rod 120 as a whole. The movable rod 120 and the fixed rod 121 form a certain angle a. The distance from the lowest point on the right side of the movable rod 120 to the fixed rod 121 is h. If the diameter of the sealing strip 10 is A, L<A and h<A should be satisfied. The distance from the highest point on the left side of the movable rod 120 to the fixed rod 121 is H, and H should be greater than A. When in use, the folded and stacked strap is passed through the buckle 12, and the left side of the movable rod 120 is pressed down to the inner side of the opening of the semi-closed circular ring on the left side of the fixed rod 121 so that the movable rod 120 no longer bounces, thereby achieving the clamping of the folded and stacked strap body 9. The schematic diagram of the use of the buckle 12 is as follows Figures 13 to 15 As shown; the above is the basic idea of ​​the buckle 12 clamping the strap body 9. Preferably, the outside of the buckle 12 can be covered with a wrapping layer, which can not only enhance the blood compatibility of the buckle 12, but also increase the friction between the movable rod 120 of the buckle 12 and the semi-closed circular ring, so that the buckle 12 and the strap are relatively more secure; or the movable rod 120 and the fixed rod 121 of the buckle 12 are both set to a wavy structure or other structure, so as to increase the friction by increasing the contact area between the buckle 12 and the strap body 9, so that the combination is more secure. Example 2

[0068] In the second embodiment of the present application, the second main blood vessel 7 includes a polymer film 71 and a metal corrugated ring 70 with deformation recovery capability; the polymer film 71 is arranged on the inner side and / or the outer side of the metal corrugated ring 70 . Example 3

[0069] In the third embodiment of the present application, a metal rod 72 is used to connect two adjacent metal corrugations 70, so that the second main blood vessel 7 has a good rigidity. Figure 11 The metal rods 72 can be on the same straight line or randomly distributed on the circumference of the polymer film 71 to connect the metal corrugations 70 one by one in series.

[0070] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention is disclosed as a preferred embodiment as above, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the above-disclosed technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technology of the present invention, which do not depart from the content of the technical solution of the present invention, are within the scope of the technical solution of the present invention.

Claims

1. A multi-branched vascular stent assembly, characterized in that: The stent comprises a stent body and a vascular band, wherein the stent body comprises a first main blood vessel, a second main blood vessel, a first branch, a second branch, a third branch, a fourth branch, and a support ring, wherein the first branch and the fourth branch are respectively connected to the proximal outer side wall of the first main blood vessel and communicate with the first main blood vessel, and the second branch and the third branch are respectively connected to the side wall of the second main blood vessel and communicate with the second main blood vessel; The distal end of the first main blood vessel is connected and communicated with the proximal end of the second main blood vessel; a flange is provided around the outer wall of the distal end of the first main blood vessel, and the support ring is provided around the outer wall of the proximal end of the second main blood vessel; The vascular band includes a band body and a buckle for fixing the band body. The band body is used to cover the outer circumference of the support ring.

2. The multi-branched vessel stent assembly according to claim 1, characterized in that: The first branch and the fourth branch are arranged at an angle of 90°, and the minimum distance between the first branch and the fourth branch is greater than 10 mm.

3. The multi-branched vessel stent assembly according to claim 1, characterized in that: The proximal end of the first main blood vessel is a free end, and the diameter of the first main blood vessel is D1, wherein 20 mm ≤ D1 ≤ 42 mm.

4. The multi-branched vessel stent assembly according to claim 1, characterized in that: The distance between the outer edge of the flange and the outer wall of the first main blood vessel is L1, wherein 12 mm ≤ L1 ≤ 25 mm.

5. The multi-branched vessel stent assembly according to claim 1, characterized in that: The second main blood vessel is a hollow tubular structure; a variable diameter structure portion is provided at the proximal end of the second main blood vessel, the variable diameter structure portion includes a middle section and a conducting section provided at both ends of the middle section, the diameter of the conducting section is D2, and the diameter of the middle section is D3, wherein D2≤D3≤1.5*D2; the distal diameter of the second main blood vessel is D4, wherein 0mm≤D2-D4<6mm.

6. The multi-branched vessel stent assembly according to claim 1, characterized in that: The second main blood vessel includes a polymer membrane and a metal corrugated ring with deformation recovery capability; the metal corrugated ring is arranged on the inner side and / or the outer side of the polymer membrane.

7. The multi-branched blood vessel stent assembly according to claim 1, characterized in that: The second main blood vessel includes a polymer membrane and a metal corrugated ring with deformation recovery capability; the polymer membrane is arranged on the inner side and / or the outer side of the metal corrugated ring.

8. The multi-branched blood vessel stent assembly according to claim 6 or 7, characterized in that: A sewing edge is further extended from the distal end of the polymer film, and the length of the sewing edge is L2, wherein 2mm≤L2≤10mm.

9. The multi-branched vessel stent assembly according to claim 5, characterized in that: The support ring is made of a material with deformation recovery ability; the diameter of the support ring is the same as the diameter of the middle section, the length of the support ring is L3, wherein 10mm≤L3≤25mm, and the support ring is sleeved on the outer wall or inner wall of the middle section.

10. The multi-branched blood vessel stent assembly according to claim 1, characterized in that: The vascular band also includes a sealing strip and a ring. Semi-enclosed circular cavities are provided on both sides of the band body. The sealing strip is installed in the circular cavity. The ring is provided at one end of the band body. The band body is wrapped around the outer circumference of the support ring. The other end of the band body is wrapped around the support ring and then passed through the ring and then stacked in reverse on the outer wall of the band body. The buckle is used to fix the stacked band bodies.

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