Integrated stent type artificial blood vessel

Abstract

The integrated stent type artificial blood vessel comprises an artificial blood vessel part which comprises an artificial blood vessel main branch, and the artificial blood vessel main branch is used for being arranged corresponding to the ascending aorta of the human body; the blood vessel broken end connecting device is arranged at the near end of an artificial blood vessel main branch and comprises a first-layer artificial blood vessel section, an inner supporting ring arranged on the peripheral side of the near end of the first-layer artificial blood vessel section and a second-layer artificial blood vessel section arranged on the peripheral side of the first-layer artificial blood vessel section in a sleeving mode. The far end of the first-layer artificial blood vessel section is connected with the far end of the second-layer artificial blood vessel section, the near end of the first-layer artificial blood vessel section and the near end of the second-layer artificial blood vessel section are free ends, and the first-layer artificial blood vessel section is connected with the artificial blood vessel main branch; the covered stent comprises a covered stent trunk connected with the artificial blood vessel main branch. According to the integrated stent type artificial blood vessel, the blood vessel anastomosis time is shortened, anastomotic stoma bleeding is avoided, the aorta root reconstruction suture difficulty is reduced, and blood leakage is avoided.

Description

Technical Field

[0001] The present application relates to the technical field of artificial blood vessel medical devices, and in particular to an integrated stent-type artificial blood vessel. Background Art

[0002] Currently, reconstruction of the ascending aortic root during A-type aortic dissection surgery is difficult. This is primarily due to the brittleness of the ascending aorta, which is easily ruptured. Using artificial sutures to reconnect the graft to the aortic root is difficult for the surgeon, and blood leakage at the suture site during the surgical revascularization is common, impacting the success rate of the procedure and increasing the risk of bleeding at the reconstruction site.

[0003] During traditional aortic dissection surgery, the brachiocephalic trunk branches, left common carotid artery and left subclavian artery need to be freed, and the covered stent is placed into the true lumen of the descending aorta under circulatory arrest. The covered stent is set separately from the four-branch artificial blood vessel. Therefore, the proximal end of the covered stent needs to be sutured to the distal end of the four-branch artificial blood vessel and the autologous aortic wall. Exposure is difficult, there is interference from backflow during suturing, and the free suture space is limited, which increases the difficulty of anastomosis, thereby prolonging the circulatory arrest time and affecting the protection of brain tissue. In addition, the difficulty of surgical operation can easily lead to the risk of post-anastomosis bleeding, prolonging the overall operation time, increasing the extracorporeal circulation time, and being unfavorable for postoperative recovery. Utility Model Content

[0004] The present application provides an integrated stent-type artificial blood vessel, comprising:

[0005] The artificial blood vessel portion includes an artificial blood vessel main branch, which is used to correspond to the ascending aorta of the human body;

[0006] A blood vessel segment connection device is provided at the proximal end of the main branch of the artificial blood vessel, comprising a first-layer artificial blood vessel segment, an inner support ring provided on the outer peripheral side of the proximal end of the first-layer artificial blood vessel segment, and a second-layer artificial blood vessel segment sleeved on the outer peripheral side of the first-layer artificial blood vessel segment, wherein the distal end of the first-layer artificial blood vessel segment is connected to the distal end of the second-layer artificial blood vessel segment, the proximal end of the first-layer artificial blood vessel segment and the proximal end of the second-layer artificial blood vessel segment are free ends, and the first-layer artificial blood vessel segment is connected to the main branch of the artificial blood vessel;

[0007] The covered stent comprises a covered stent trunk connected to a main branch of an artificial blood vessel.

[0008] In some optional embodiments of the present application, the portion of the artificial blood vessel main branch close to the blood vessel end connection device in its own axial direction is the proximal tube portion, and the portion away from the blood vessel end connection device is the artificial branch connection tube portion, and the periphery of the artificial branch connection tube portion is connected to the artificial branch blood vessel.

[0009] In some optional embodiments of the present application, a first adjustment structure for adjusting the axial length of the proximal tube portion is provided on the outer periphery of the proximal tube portion;

[0010] The regulatory structure includes:

[0011] a plurality of annular adjustment portions, each of which is spaced apart along the axial direction of the proximal tube portion; each annular adjustment portion includes a plurality of radially outwardly projecting members, each of which is formed with a through hole, the through hole opening direction of which is the same as the axial direction of the proximal tube portion; and the plurality of radially outwardly projecting members of each annular adjustment portion are spaced apart in the circumferential direction of the proximal tube portion;

[0012] There are multiple spacing adjustment lines, each of which passes through the through hole of the radially outward protruding part between at least two different annular adjustment parts. The axial length and / or bending angle of the proximal tube part is adjusted by tightening or loosening the spacing adjustment line.

[0013] In some optional embodiments of the present application, the plurality of radially outward protruding members of each annular adjustment portion are arranged on the same plane in the circumferential direction of the proximal tube portion.

[0014] In the axial direction of the proximal tube portion, the multiple radially outward protruding parts in all the annular adjustment portions are aligned into multiple rows to form a plurality of axial adjustment units.

[0015] In some optional embodiments of the present application, each spacing adjustment line adopts a U-shaped routing method to pass through at least two annular adjustment parts and pass through two axial adjustment units. The U-shaped bottom of the spacing adjustment line is set toward the distal end of the proximal tube part, and the two free ends of the spacing adjustment line are set toward the proximal end of the proximal tube part.

[0016] In some optional embodiments of the present application, in the naturally expanded state, the first layer artificial blood vessel segment and the corresponding part of the inner support ring extend beyond the proximal end of the second layer artificial blood vessel segment, and the length of the first layer artificial blood vessel segment is greater than the length of the second layer artificial blood vessel segment.

[0017] In some optional embodiments of the present application, in the naturally expanded state, the proximal end of the second layer of the artificial blood vessel segment is flush with or exceeds the proximal end of the first layer of the artificial blood vessel segment.

[0018] The free end portion of the second layer artificial blood vessel segment close to the free end portion of the second layer artificial blood vessel segment forms the free end portion of the second layer artificial blood vessel segment. A first outer shrinkage ring structure with an adjustable diameter is provided on the outer peripheral side of the free end portion of the second layer artificial blood vessel segment. The first outer shrinkage ring structure and the inner support ring overlap in the radial direction of the blood vessel end connection device to form a first clamping and leak-proof area.

[0019] In some optional embodiments of the present application, the blood vessel end connection device further includes a third layer of artificial blood vessel segment sleeved on the second layer of artificial blood vessel segment, and the distal end of the third layer of artificial blood vessel segment is connected to the second layer of artificial blood vessel segment and / or the first layer of artificial blood vessel segment.

[0020] The proximal end of the third artificial blood vessel segment is a free end. The length of the third artificial blood vessel segment is greater than that of the second artificial blood vessel segment. The length of the third artificial blood vessel segment is equal to or greater than that of the first artificial blood vessel segment.

[0021] In some optional embodiments of the present application, the diameter of the inner support ring can be adjusted and increased and is arranged on the proximal outer peripheral side of the first layer of artificial blood vessel. The inner support ring is made of memory alloy. The inner support ring is a first cylindrical non-closed ring. The open loop of the inner support ring forms a relative and arc-shaped first wall groove and a first slot body in the circumferential direction of the inner support ring. The length of the first slot body in the circumferential direction of the inner support ring is less than the groove depth of the wall groove.

[0022] In some optional embodiments of the present application, the proximal portion of the segment close to the third-layer artificial blood vessel segment forms the proximal portion of the third-layer artificial blood vessel segment;

[0023] A second outer shrink ring structure with adjustable diameter is provided on the outer periphery of the proximal end of the third artificial blood vessel segment. The second outer shrink ring structure overlaps with the inner support ring in the radial direction of the blood vessel end connection device to form a second clamping and leak-proof area.

[0024] In some optional embodiments of the present application, the second outer shrink ring structure includes a restraining belt and a fastening assembly, and the fastening assembly includes a buckle head and a buckle hook respectively provided at both ends of the restraining belt.

[0025] After the buckle hook is hooked on the buckle head, the restraint belt becomes a ring shape, and the circumference of the restraint belt ring is adjusted by the fastening component to adjust the diameter of the restraint belt ring.

[0026] In some optional embodiments of the present application, the second outer shrink ring structure is made of a memory alloy, the inner support ring is a second cylindrical non-closed ring, and the open ring of the second outer shrink ring structure forms a second wall groove and a second slot body that are opposite and arc-shaped and adapted to each other in the circumference of the second outer shrink ring structure, and the length of the second slot body in the circumference of the second outer shrink ring structure is less than the groove depth of the second wall groove;

[0027] In some optional embodiments of the present application, a plurality of slots are formed on the second wall groove along the circumference of the second outer shrink ring structure, and the second slot body is formed with teeth matching the shape of the slots. After the diameter of the second outer shrink ring structure is reduced, radial pressure is applied to the inner support ring through the locking connection between the teeth and the slots.

[0028] It can be understood that the outer contraction ring structure (including the first outer contraction ring structure and the second outer contraction ring structure) is connected to the outer peripheral side of the corresponding artificial blood vessel segment.

[0029] Alternatively, the outer contraction ring structure and the corresponding artificial blood vessel segment are interactive and independent structures. When a clamping and leak-proof area needs to be formed, the outer contraction ring structure is arranged on the outer peripheral side of the proximal end portion of the corresponding artificial blood vessel segment.

[0030] In some optional embodiments of the present application, the stent graft includes a left subclavian artery branch disposed beside the stent graft trunk and communicating with the stent graft trunk.

[0031] The integrated stent-type artificial blood vessel further includes:

[0032] A flexible connecting pipe segment is arranged between the artificial blood vessel part and the coated stent. The flexible connecting pipe segment includes a main pipe segment and a short side tubular joint arranged beside the main pipe segment and connected to the main pipe segment. In the main blood flow direction of the artificial blood vessel, the proximal end of the main pipe segment is connected to the main branch of the artificial blood vessel, and the distal end of the main pipe segment is connected to the proximal end of the main branch of the artificial blood vessel. The axial height of the short side tubular joint is less than the axial height of the branch of the left subclavian artery.

[0033] In some optional embodiments of the present application, the integrated stent-type artificial blood vessel also includes an anti-reflux cap, which is arranged around the periphery of the connection between the main branch and the main pipe section of the artificial blood vessel, and the cap opening of the anti-reflux cap faces the flexible connecting pipe section.

[0034] The integrated stent-type artificial blood vessel provided by the present application has an integrated design in which the artificial blood vessel portion and the covered stent are connected. This avoids the problem of difficult exposure caused by the need to suture the proximal end of the covered stent with the distal end of the four-branch artificial blood vessel and the autologous aortic wall. There is no need to anastomose the stent and the artificial blood vessel during surgery, which reduces the time for anastomosis and avoids the risk of bleeding at the anastomosis site. The blood vessel end connection device is arranged at the proximal end of the main branch of the artificial blood vessel. The blood vessel end connection device includes two coaxially layered artificial blood vessel segments, which avoids bleeding between the first layer of artificial blood vessel segments and the ascending aortic wall during the reconstruction of the ascending aortic root, can greatly shorten the suturing time and the difficulty of suturing during the reconstruction of the aortic root, and reduces the requirements for the suturing operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the same type of aortic dissection;

[0036] Figure 2 Schematic diagram of the anatomical structure of the human aorta;

[0037] Figure 3 This is a schematic diagram of the structure of the integrated stent-type artificial blood vessel of Example 1 of the present application;

[0038] Figure 4Schematic diagram of the adjustment of the proximal tube portion by the first adjustment structure in a tightened state and a relaxed state in Example 1 of the present application;

[0039] Figure 5 This is a simplified axial cross-sectional structural diagram of an example of the blood vessel end connection device in Example 1 of the present application;

[0040] Figure 6 This is a disassembled diagram of an exemplary three-dimensional structure of the blood vessel stump connection device in Example 1 of the present application;

[0041] Figure 7 This is a schematic diagram of an exemplary three-dimensional structure of the blood vessel stump connection device in Example 1 of the present application;

[0042] Figure 8 This is a schematic diagram of the three-dimensional structure of the inner support ring of the blood vessel end connection device in Example 1 of the present application;

[0043] Figure 9 This is a schematic diagram of an exemplary structure of the second outer contractile ring structure of the blood vessel end connection device in Example 1 of the present application;

[0044] Figure 10 This is another exemplary structural diagram of the second outer contractile ring structure of the blood vessel end connection device in Example 1 of the present application;

[0045] Figure 11 This is a simplified axial cross-sectional structural diagram of another example of the blood vessel end connection device in Example 1 of the present application;

[0046] Figure 12 This is a simplified axial cross-sectional structural diagram of another example of the blood vessel end connection device in Example 1 of the present application;

[0047] Figure 13 This is a simplified structural diagram of another example of the blood vessel stump connection device in Example 1 of the present application, in which a first outer contractile ring structure is provided;

[0048] Figure 14 This is a schematic diagram of the structure of an integrated stent-type artificial blood vessel according to Example 2 of the present application;

[0049] Figure 15 This is a schematic diagram of the structure of an integrated stent-type artificial blood vessel according to Example 3 of the present application;

[0050] Figure 16 This is a schematic diagram of the structure of an integrated stent-type artificial blood vessel according to Example 4 of the present application;

[0051] Figure 17 This is a schematic diagram of the process of ascending aorta reconstruction using the blood vessel stump connection device in an embodiment of the present application;

[0052] Figure 18This is a schematic diagram of the process of implanting an integrated stent-type artificial blood vessel into a patient's body according to an embodiment of the present application.

[0053] Artificial blood vessel portion 1; artificial blood vessel main branch 11; proximal tube portion 111; artificial branch connecting tube portion 112; first adjustment structure 12; annular adjustment portion 121; radially outward protrusion 1211; spacing adjustment line 122; axial adjustment unit 123;

[0054] Perfusion branch-13; artificial brachiocephalic trunk branch-14; spare vascular branch-15;

[0055] Blood vessel end connection device-2; first outer contraction ring structure-21; first layer artificial blood vessel segment-22; large diameter tube portion-221; small diameter tube portion-222; connection point between the large diameter tube portion and the small diameter tube portion-223;

[0056] Second artificial blood vessel segment 23; third artificial blood vessel segment 24; inner support ring 25; first wall groove 251; first slot body 252;

[0057] Covered stent-3; left subclavian artery branch-31; covered stent trunk-32;

[0058] Bendable connecting pipe section-4; main pipe section-41; side short tubular joint-42;

[0059] Second outer shrink ring structure 5; restraint belt 51; fastening assembly 52; buckle head 521; hook 522; slot 53; latch tooth 54; second wall groove 55; second slot body 56;

[0060] Anti-reflux cap-6;

[0061] Covered short tube stent-7;

[0062] The main blood flow direction of the artificial blood vessel - X;

[0063] proximal-a; distal-b; DETAILED DESCRIPTION

[0064] The following will be combined with the Figures 1 to 18 The technical solution of this application is described in detail.

[0065] The description of the proximal and distal ends of the structure in the embodiments of the present application is based on the direction of blood flow in the human body. The end where blood flows into the structure (such as a blood vessel) is the proximal end of the structure, and the end where blood flows out of the structure is the distal end of the structure.

[0066] Figure 1Schematic diagram of the same type of aortic dissection. The annual incidence of aortic dissection is 7.9 / 100,000 person-years to 16 / 100,000 person-years. It can be divided into Stanford type A and type B according to the location of the rupture. The incidence of Stanford type A aortic dissection (TAAD) is about twice that of Stanford type B aortic dissection (TBAD). If not treated in time, the 24-hour mortality rate is as high as 50%. For TAAD, current guidelines recommend early open surgery to repair the torn aorta. However, open surgery often requires a midline thoracotomy and deep hypothermic circulatory arrest.

[0067] In the process of re-suturing the proximal end of the main branch of the artificial blood vessel to the root of the ascending aorta to re-establish the connection, since the ascending aorta is fragile and easy to rupture, the traditional method of using artificial suturing to sew the proximal end of the artificial blood vessel to the root of the ascending aorta to re-establish the connection is difficult for the operator. When the operation opens the circulation, it is easy to leak blood at the suture site, affecting the success rate of the operation, and the risk of bleeding at the reconstruction site is high.

[0068] Figure 2 The figure is a schematic diagram of the anatomical structure of the human aorta. Figure 2 It can be seen that the aorta is mainly arch-shaped, including the ascending aorta and the descending aorta, the innominate artery (connected to the right subclavian artery and the right common carotid artery, the innominate artery can also be called the autologous brachiocephalic trunk branch), the left common carotid artery and the left subclavian artery formed on the greater curvature side of the aortic arch.

[0069] [Example 1]

[0070] like Figure 3 The present application provides an integrated stent-type artificial blood vessel, comprising:

[0071] The artificial blood vessel portion includes an artificial blood vessel main branch, which is used to correspond to the ascending aorta of the human body;

[0072] A blood vessel segment connection device is provided at the proximal end of the main branch of the artificial blood vessel, comprising a first-layer artificial blood vessel segment, an inner support ring provided on the outer peripheral side of the proximal end of the first-layer artificial blood vessel segment, and a second-layer artificial blood vessel segment sleeved on the outer peripheral side of the first-layer artificial blood vessel segment, wherein the distal end of the first-layer artificial blood vessel segment is connected to the distal end of the second-layer artificial blood vessel segment, the proximal end of the first-layer artificial blood vessel segment and the proximal end of the second-layer artificial blood vessel segment are free ends, and the first-layer artificial blood vessel segment is connected to the main branch of the artificial blood vessel;

[0073] The covered stent comprises a covered stent trunk connected to a main branch of an artificial blood vessel.

[0074] In some optional embodiments of the present application, the portion of the artificial blood vessel main branch close to the blood vessel end connection device in its own axial direction is the proximal tube portion, and the portion away from the blood vessel end connection device is the artificial branch connection tube portion, and the periphery of the artificial branch connection tube portion is connected to the artificial branch blood vessel.

[0075] like Figure 3 As shown, the artificial branch connecting tube portion 112 is connected to the artificial brachiocephalic trunk branch 14 and the perfusion branch 13 belonging to the artificial branch blood vessel.

[0076] like Figures 3 and 4 As shown, in some optional embodiments of the present application, a first adjustment structure 12 for adjusting the axial length of the proximal tube portion 111 is provided on the outer periphery of the proximal tube portion 111;

[0077] The regulatory structure includes:

[0078] Multiple annular adjustment portions 12 are provided at intervals along the axial direction of the proximal tube portion 111. Each annular adjustment portion 12 includes multiple radially outwardly projecting members 1211. Each radially outwardly projecting member 1211 has a through hole formed therein. The opening direction of the through hole is the same as the axial direction of the proximal tube portion 111. The multiple radially outwardly projecting members 1211 of each annular adjustment portion 12 are arranged at intervals in the circumferential direction of the proximal tube portion 111.

[0079] There are multiple spacing adjustment lines 122, and each spacing adjustment line 122 is passed through the through hole of the radially outward protruding part 1211 between at least two different annular adjustment parts 12. The axial length and / or bending angle of the proximal tube part 111 is adjusted by tightening or loosening the spacing adjustment line 122.

[0080] In some optional embodiments of the present application, the plurality of radially outward protruding parts 1211 of each annular adjustment portion 12 are arranged on the same plane in the circumferential direction of the proximal tube portion 111.

[0081] In the axial direction of the proximal tube portion 111 , the multiple radially outward protruding parts 1211 in all the annular adjustment portions 12 are aligned into multiple rows to form a plurality of axial adjustment units 123 .

[0082] In some optional embodiments of the present application, each spacing adjustment line 122 adopts a U-shaped routing method to pass through at least two annular adjustment parts 12 and pass through two axial adjustment units 123. The U-shaped bottom of the spacing adjustment line 122 is set toward the distal end b of the proximal tube part 111, and the two free ends of the spacing adjustment line 122 are set toward the proximal end a of the proximal tube part 111.

[0083] In some optional embodiments of the present application, the stent graft 3 includes a left subclavian artery branch 31 disposed beside the stent graft trunk 32 and communicating with the stent graft trunk 32.

[0084] The integrated stent-type artificial blood vessel further includes:

[0085] The flexible connecting pipe segment 4 is arranged between the artificial blood vessel part 1 and the coated stent 3. The flexible connecting pipe segment 4 includes a main pipe segment 41 and a short tubular joint 42 arranged beside the main pipe segment 41 and connected to the main pipe segment 41. In the main blood flow direction X of the artificial blood vessel, the proximal end a of the main pipe segment 41 is connected to the main branch 11 of the artificial blood vessel, and the distal end b of the main pipe segment 41 is connected to the proximal end a of the main branch 11 of the artificial blood vessel. The axial height of the short tubular joint 42 is less than the axial height of the left subclavian artery branch 31.

[0086] In these embodiments, a single side short tubular joint 42 is provided.

[0087] In some optional embodiments of the present application, the integrated stent-type artificial blood vessel also includes an anti-reflux cap 6, which is arranged around the periphery of the connection between the main branch 11 of the artificial blood vessel and the main pipe section 41, and the cap opening of the anti-reflux cap 6 faces the flexible connecting pipe section 4.

[0088] In some optional embodiments of the present application, each spacing adjustment line 122 is U-shaped and passes through at least two annular adjustment parts 12 and two axial adjustment units 123. The U-shaped bottom of the spacing adjustment line 122 is set toward the distal end b of the blood vessel end connection device 2, and the two free ends of the spacing adjustment line 122 are set toward the proximal end a of the artificial branch connection tube part 112.

[0089] In these embodiments, when the axial length and / or bending angle of the proximal tube portion 111 need to be adjusted, the operator can hold the two free ends of the spacing adjustment wire 122 and tighten the spacing adjustment wire 122 toward the proximal end a of the artificial branch connecting tube portion 112, thereby shortening the portion of the proximal tube portion 111 corresponding to the U-shaped alignment of the spacing adjustment wire 122 in the axial direction. When the spacing adjustment wire 122 is in a relaxed state, since the proximal tube portion 111 is a tubular structure that is axially retractable and bendable, the operator can stretch the proximal tube portion 111 axially to increase the axial length of the main tube section 41.

[0090] Figure 4 The diagram illustrates the use of multiple spacing adjustment wires 122 on the main pipe section 41 to adjust the overall axial length of the proximal pipe portion 111. Tightening all spacing adjustment wires 122 in the same direction, i.e., when the spacing adjustment wires 122 are tightened, shortens the axial length of the proximal pipe portion 111. When all spacing adjustment wires 122 are loosened, the overall axial length of the proximal pipe portion 111 of the main pipe section 41 returns to its original length.

[0091] There are many examples of how the spacing adjustment wire 122 is wound between two different annular adjustment portions 12 , as long as the axial length and / or bending angle of the proximal tube portion 111 can be adjusted by tightening or loosening the spacing adjustment wire 122 .

[0092] like Figures 5 to 7 As shown, the blood vessel segment connection device 2 further includes a third layer artificial blood vessel segment 24 sleeved on the second layer artificial blood vessel segment 23, and the distal end b of the third layer artificial blood vessel segment 24 is connected to the second layer artificial blood vessel segment 23 and / or the first layer artificial blood vessel segment 22.

[0093] The proximal end a of the third artificial blood vessel segment 24 is a free end. The length of the third artificial blood vessel segment 24 is greater than that of the second artificial blood vessel segment 23 . The length of the third artificial blood vessel segment 24 is equal to or greater than that of the first artificial blood vessel segment 22 .

[0094] The blood vessel end connection device 2 has a multi-layer tubular structure, which includes a first-layer artificial blood vessel segment 22, a second-layer artificial blood vessel segment 23, and a third-layer artificial blood vessel segment 24, which are coaxially arranged from the inside to the outside. The distal end b of the second-layer artificial blood vessel segment 23 and the distal end b of the third-layer artificial blood vessel segment 24 are connected to the portion of the first-layer artificial blood vessel segment 22 close to its own distal end b. The proximal end a of each tube segment in the multi-layer tubular structure is a free end, wherein:

[0095] The portion of the first artificial blood vessel segment 22 close to the proximal end a of the first artificial blood vessel segment 22 forms the proximal end a portion of the first artificial blood vessel segment 22, and the inner support ring 25 is arranged on the outer peripheral side of the proximal end a portion of the first artificial blood vessel segment 22.

[0096] In the naturally expanded state, the length of the second-layer artificial blood vessel segment 23 is shorter than the length of the first-layer artificial blood vessel segment 22 and shorter than the length of the third-layer artificial blood vessel segment 24 .

[0097] In the embodiment of the present application, the natural expansion state of the artificial blood vessel segments in different layers refers to the state in which the artificial blood vessel segments are placed on a horizontal plane and are not stretched or compressed in the axial direction without the action of external forces (such as tension or pressure).

[0098] The blood vessel stump connection device 2 provided in the embodiment of the present application is provided with three layers of artificial blood vessel segments, and an inner support ring 25 is provided on the outer peripheral side of the proximal end a portion of the inner artificial blood vessel, mainly to provide support and protection for the root of the ascending aorta to prevent blood vessel rupture and damage. The length of the second layer artificial blood vessel segment 23 is less than the length of the first layer artificial blood vessel segment 22, and less than the length of the third layer artificial blood vessel segment 24. During the operation, the second layer artificial blood vessel segment 23 can be half-sewn to the root of the ascending aorta, and then the first layer artificial blood vessel segment 22 can be pulled down so that the inner support ring 25 supports the root of the ascending aorta. Then, the first layer artificial blood vessel segment 22, the second layer artificial blood vessel segment 23 and the root of the patient's own ascending aorta are fully sutured. The provision of the second layer artificial blood vessel segment 23 can prevent bleeding between the first layer artificial blood vessel segment 22 and the wall of the ascending aorta. Finally, the third artificial blood vessel segment 24 is pulled down, and the proximal end a of the third artificial blood vessel segment 24 is sealed with the inner support ring 25, further limiting blood leakage between the inner support ring 25 and the aortic wall, completely ensuring that no blood leakage occurs. The blood vessel end connection device 2 provided in this embodiment of the application can significantly shorten the suturing time and difficulty during aortic root reconstruction, reduce the requirements for suturing operations, and simultaneously avoid blood leakage problems at the ascending aortic root reconstruction site, thereby improving the success rate of the operation.

[0099] In some optional embodiments of the present application, the inner artificial blood vessel segment is formed with a large diameter tube portion 221 and a small diameter tube portion 222. The large diameter tube portion 221 is arranged corresponding to the position of the inner support ring 25. The diameter of the large diameter tube portion 221 is larger than that of the small diameter tube portion 222. The connection 223 between the large diameter tube portion and the small diameter tube portion is stepped.

[0100] In these embodiments, the design of the large-diameter tube portion 221 and the small-diameter tube portion 222 can ensure that the inner layer of the artificial blood vessel fits better with the root of the ascending aorta, further enhance the supporting effect of the inner support ring 25 on the root of the ascending aorta, and further reduce the possibility of bleeding.

[0101] like Figure 8 As shown, the diameter of the inner support ring 25 can be adjusted and increased and is arranged on the outer peripheral side of the proximal end a of the first layer of artificial blood vessel. The inner support ring 25 is made of memory alloy. The inner support ring 25 is a first cylindrical non-closed ring. The open loop of the inner support ring 25 forms a relative and arc-shaped first wall groove 251 and a first slot body 252 in the circumference of the inner support ring 25. The length of the first slot body 252 in the circumference of the inner support ring 25 is less than the groove depth of the wall groove.

[0102] In some optional embodiments of the present application, the portion of the third-layer artificial blood vessel segment 24 close to the proximal end a of the third-layer artificial blood vessel segment 24 forms the proximal end a portion of the third-layer artificial blood vessel segment 24;

[0103] A second outer shrink ring structure 5 with an adjustable diameter is provided on the outer peripheral side of the proximal end a of the third layer artificial blood vessel segment 24. The second outer shrink ring structure 5 and the inner support ring 25 overlap in the radial direction of the blood vessel end connection device 2 to form a second clamping and leak-proof area.

[0104] like Figure 9 As shown, in some examples, the second outer shrink ring structure 5 includes a restraining belt 51 and a fastening assembly 52, and the fastening assembly 52 includes a buckle head 521 and a buckle hook 522 respectively provided at both ends of the restraining belt 51.

[0105] After the hook 522 is hooked on the buckle head 521 , the restraint belt 51 becomes a ring. The circumference of the ring of the restraint belt 51 is adjusted by the fastening assembly 52 to adjust the diameter of the ring of the restraint belt 51 .

[0106] like Figure 10 As shown, in some examples, the second outer shrink ring structure 5 is made of memory alloy, the inner support ring 25 is a second cylindrical non-closed ring, and the open ring of the second outer shrink ring structure 5 forms a relative and arc-shaped second wall groove 55 and a second slot body 56 in the circumferential direction of the second outer shrink ring structure 5. The length of the second slot body 56 in the circumferential direction of the second outer shrink ring structure 5 is less than the groove depth of the second wall groove 55.

[0107] A plurality of slots 53 are formed on the second wall groove 55 along the circumference of the outer shrink ring structure, and a locking tooth 54 matching the shape of the slot 53 is formed on the second slot body 56. After the diameter of the outer shrink ring structure is reduced, radial pressure is applied to the inner support ring 25 through the locking connection between the locking tooth 54 and the slot 53.

[0108] like Figure 11As shown, in some examples of the embodiments of the present application, the blood vessel segment connecting device 2 has a two-layer structure, comprising a first-layer artificial blood vessel segment 22, an inner support ring 25 disposed on the outer periphery of the proximal end a of the first-layer artificial blood vessel segment 22, and a second-layer artificial blood vessel segment 23 sleeved on the outer periphery of the first-layer artificial blood vessel segment 22. In the naturally deployed state, the corresponding portions of the first-layer artificial blood vessel segment 22 and the inner support ring 25 extend beyond the proximal end a of the second-layer artificial blood vessel segment 23, and the length of the first-layer artificial blood vessel segment 22 is greater than the length of the second-layer artificial blood vessel segment 23. In some specific examples, the blood vessel stump connecting device 2 has a two-layer structure and the corresponding parts of the first-layer artificial blood vessel segment 22 and the inner support ring 25 are arranged beyond the proximal end a of the second-layer artificial blood vessel segment 23. During the operation, the second-layer artificial blood vessel segment 23 can be half-sewn to the root of the ascending aorta first, and then the first-layer artificial blood vessel segment 22 can be pulled down so that the inner support ring 25 supports the root of the ascending aorta. Then, the first-layer artificial blood vessel segment 22, the second-layer artificial blood vessel segment 23 and the root of the patient's own ascending aorta are fully sutured. Finally, a first outer contraction ring structure 21 with an adjustable diameter is arranged on the proximal end a side of the second-layer artificial blood vessel segment 23. The first outer contraction ring structure 21 and the inner support ring 25 correspond to each other in the radial direction of the blood vessel stump connecting device 2. The first outer contraction ring structure 21 and the inner support ring 25 have a radial squeezing effect on each other, further limiting blood leakage between the inner support ring 25 and the aortic wall.

[0109] like Figure 12 and Figure 13 As shown, in some examples of the embodiments of the present application, the blood vessel segment connection device 2 has a two-layer structure, comprising a first-layer artificial blood vessel segment 22, an inner support ring 25 disposed on the outer periphery of the proximal end a of the first-layer artificial blood vessel segment 22, and a second-layer artificial blood vessel segment 23 sleeved on the outer periphery of the first-layer artificial blood vessel segment 22. In the naturally deployed state, the proximal end a of the second-layer artificial blood vessel segment 23 is flush with or extends beyond the proximal end a of the first-layer artificial blood vessel segment 22.

[0110] The portion of the second artificial blood vessel segment 23 near its free end forms the free end portion of the second artificial blood vessel segment 23. A first outer shrink ring structure 21, whose diameter can be adjusted to reduce, is disposed on the outer periphery of the free end portion of the second artificial blood vessel segment 23. The first outer shrink ring structure 21 overlaps with the inner support ring 25 in the radial direction of the blood vessel end connection device 2 to form a first clamping and leak-proofing area. The specific structure of the first outer shrink ring structure 21 can be the same as that of the second outer shrink ring structure 5 described above.

[0111] In some examples of the embodiments of the present application, a second adjustment structure is provided on the periphery of the main pipe section 41 , and the second adjustment structure has the same shape as the first adjustment structure 12 .

[0112] In some examples of the embodiments of the present application, the distal end b of the first layer of the artificial blood vessel segment 22 of the blood vessel end connecting device 2 is connected to the proximal end a of the artificial blood vessel main branch 11 .

[0113] In some other examples of the embodiments of the present application, the first layer of the artificial blood vessel segment 22 of the blood vessel end connecting device 2 is integrally formed with the artificial blood vessel main branch 11 .

[0114] [Example 2]

[0115] like Figure 14 As shown, the difference from Example 1 of the present application is that a coated short tubular stent 7 is connected to the side short tubular connector 42 to form an artificial left common carotid artery branch.

[0116] [Example 3]

[0117] like Figure 15 As shown, the difference from Example 1 of the present application is that two short tubular joints 42 are provided, and only a spare blood vessel branch 15 is provided on the artificial branch connecting tube portion 112.

[0118] [Example 4]

[0119] like Figure 16 As shown, the difference from Example 1 of the present application is that two short tubular joints 42 are provided, and only a spare blood vessel branch 15 is provided on the artificial branch connecting tube portion 112.

[0120] A coated short tubular stent 7 (a balloon-expandable stent) is connected to the short tubular joint 42 near the blood vessel end connection device 2 to form an artificial brachiocephalic trunk branch 14, and another coated short tubular stent 7 (a bent rod Viabahn) is connected to the short tubular joint 42 away from the blood vessel end connection device 2 to form an artificial left common carotid artery branch.

[0121] like Figure 17 As shown, the surgical process of the ascending aorta root reconstruction using an exemplary structure of a blood vessel stump connection device 2 according to an embodiment of the present application is specifically described:

[0122] like Figure 17In frame A of these embodiments, during the reconstruction of the ascending aorta root, routine disinfection and draping are first performed, the internal jugular vein, the right dorsalis pedis artery and the radial artery are pierced, the right femoral artery is freed, and the right axillary artery is reserved, the thoracotomy is performed, the innominate artery, the left common carotid artery, and the left subclavian artery are freed, the pericardium is suspended, and after heparinization (3 ml / kg), the right femoral artery and the right axillary artery are selected, and a caesarean cannula is used to establish extracorporeal circulation. After the machine is switched, the temperature is lowered in parallel, the aorta is blocked, the ascending aorta is opened, the thrombus is cleared, and the height of the intact ascending aorta root is 2 cm (i.e., the height between the sinus-tubular junction and the distal end b edge of the remaining ascending aorta after cutting) is retained. The left and right coronary arteries are perfused, the heart is stopped, the aortic root is processed (Bentall / David / Wheat is required for the cumulative coronary artery or aortic valve), and the vascular end connection device 2 in the embodiment of the present application is used to reconstruct the ascending aorta root of aortic dissection.

[0123] like Figure 17 As shown in box B, take an inner lining pad (a semicircular rectangular pad with a length of half the circumference of the ascending aorta and a width of 1 cm) and fix it to the posterior half of the distal b edge of the ascending aortic root with a 5-0 prolene mattress suture, and the inner lining pad is located on the inner circumference of the ascending aortic root.

[0124] like Figure 17 As shown in the C box, the first layer artificial blood vessel segment 22 and the third layer artificial blood vessel segment 24 are retracted, exposing only the middle layer artificial blood vessel. Use 5-0 prolene line to sew the second layer artificial blood vessel segment 23, the distal b edge of the ascending aorta root and the inner lining gasket (the three are overlapped and sutured for 5mm) to the tubular rear half corresponding to the shape of the inner lining gasket, and tighten the suture to fix it first.

[0125] like Figure 17 As shown in the D box, the first artificial blood vessel segment 22 is then pulled down, allowing the inner support ring 25, located on the outer periphery of the proximal end a of the first artificial blood vessel segment 22, to be inserted into the ascending aorta root until the distal end b of the inner support ring 25 is flush with the sinus-tubular junction. By changing the temperature or performing a stretching operation, the inner support ring 25 is expanded, increasing its diameter, and the tubular front half is sutured. At this point, the ascending aorta, the first artificial blood vessel segment 22, and the second artificial blood vessel segment 23 are sutured along the ascending aorta root. From the outside to the inside, the suture structure is the second artificial blood vessel segment 23, the ascending aorta root, and the first artificial blood vessel segment 22. Here, the first artificial blood vessel segment 22 acts as a gasket to secure the inner support ring 25, and the suture is complete.

[0126] Finally, the third-layer artificial blood vessel segment 24 is pulled down, and the proximal end a of the third-layer artificial blood vessel segment 24 is aligned with the proximal end a of the first-layer artificial blood vessel segment 22, so that the outer shrinkage ring structure and the inner support ring 25 overlap in the radial direction of the blood vessel end connection device 2 to form a clamping and leak-proof area, and the outer shrinkage ring structure is controlled to be reduced in the radial direction so that the outer shrinkage ring structure and the inner support ring 25 form an interference fit in the clamping and leak-proof area, and the outer shrinkage ring structure and the inner support ring 25 restrict and fix each other, further avoiding the problem of bleeding after the reconstruction of the ascending aorta root.

[0127] Figure 17 Box E shows the ascending aortic root after reconstruction.

[0128] In some embodiments, when the outer shrink ring structure includes: a ligature 51 and a fastening assembly 52, the fastening assembly 52 includes a buckle head 521 and a hook 522 respectively provided at both ends of the ligature 51. When the outer shrink ring structure and the inner support ring 25 are controlled to overlap and compress in the radial direction, after the hook 522 is hooked on the buckle head 521, the ligature 51 is formed into a ring shape, and the operator adjusts the circumference and diameter of the ligature 51 through the fastening assembly 52, thereby adjusting the compression effect of the outer shrink ring structure on the inner support ring 25 to prevent bleeding.

[0129] In other embodiments, when the outer shrink ring structure is made of a memory alloy, the diameter of the outer shrink ring structure is first increased before being inserted into the patient's body. When inserted into the patient's body, the ambient temperature of the outer shrink ring structure changes, causing the outer shrink ring structure to return from its original state of increased diameter. That is, the second slot body 56 moves deeper into the second wall groove 55 along the circumference, causing the outer shrink ring structure to decrease in circumference and diameter. After reaching the desired diameter, the latching teeth 54 formed on the second slot body 56 can be engaged with a latching groove 53 on the second wall groove 55 to achieve a latching and locking effect, thereby ensuring that the outer shrink ring structure compresses and restrains the inner support ring 25.

[0130] In some examples, the slot 53 is opened in a clockwise direction, and the teeth 54 are extended in a clockwise direction, so that the slot 53 and the teeth 54 can be clamped in a clockwise direction.

[0131] In general, by setting up three coaxial artificial blood vessel segments, an inner support ring 25 on the outer periphery of the first artificial blood vessel segment 22, and setting the length of each artificial blood vessel segment, the problem of difficulty in suturing the ascending aorta root due to rupture of the ascending aorta root due to its brittleness during reconstruction of the ascending aorta root is avoided. The suturing of the second artificial blood vessel segment 23 limits the bleeding between the inner support ring 25 of the first artificial blood vessel and the ascending aorta wall. The third artificial blood vessel segment 24 and the first artificial blood vessel segment 22 are tightly fitted with each other through the inner support ring 25 and the outer contraction ring structure, further limiting the bleeding between the inner support ring 25 on the outer periphery of the first artificial blood vessel and the aorta wall, thereby achieving complete protection against bleeding, while reducing suturing requirements, shortening suturing time, and improving the quality of surgical completion.

[0132] Please refer to Figure 2 and Figure 18 , specifically introduces the process of performing A-type aortic dissection surgery using an integrated stent-type artificial blood vessel in an embodiment of the present application:

[0133] like Figure 18 As shown in box D1: Routine disinfection and draping are performed. The internal jugular vein, right dorsalis pedis artery, and radial artery are punctured. The right femoral artery is freed, with the right axillary artery reserved. The thoracotomy is then performed, the innominate artery is freed, and the pericardium is suspended. After heparinization (3 ml / kg), the right femoral and right axillary arteries are selected, and a cavo-atrial cannula is used to establish extracorporeal circulation. After transfer and cooling, the aorta is clamped, the ascending aorta is dissected, and the thrombus is cleared, leaving the ascending aorta root intact at a height of 2 cm (i.e., the height from the sinus-tubular junction to the distal edge of the remaining ascending aorta after resection). The left and right coronary arteries are perfused, the heart is arrested, the aortic root is treated (Bentall / David / Wheat is required for cumulative coronary arteries or aortic valves), the left and right coronary arteries are perfused, the heart is arrested, and the gasket is fixed. The temperature is cooled to 32°C, an ice cap is applied to the brain, the circulation is stopped, and the brain is perfused via the right axillary artery at 5 ml / kg / min.

[0134] like Figure 18 As shown in the D2 box: prepare the integrated stent-type artificial blood vessel in the embodiment of the present application, and pre-place three 5-0 prolene sutures evenly at the root of the left common carotid artery. Depending on the morphology of the aorta, if placement is difficult, a small part can be cut along the long axis of the aorta until the conditions for stent placement are met.

[0135] like Figure 18 As shown in the D3 and D4 boxes: the main conical covered stent trunk 32 is first inserted, and then the left subclavian artery branch trunk 31 is inserted. After the left subclavian artery branch trunk 31 is completely released, the adjustment structure set on the periphery of the main tube section 41 is adjusted according to the distance between the left subclavian artery and the left common carotid artery to ensure that the subsequent artificial left common carotid artery branch matches the left common carotid artery.

[0136] like Figure 18As shown in the D5 box: a coated short tubular stent 7 (Crooked Rod Viabahn) is inserted into the left common carotid artery, and then the coated short tubular stent 7 (Crooked Rod Viabahn) is connected to the short tubular connector 42 close to the coated stent 3 (the short tubular connector 42 corresponding to the left common carotid artery branch is released while the crooked rod Viabahn is inserted) to form an artificial left common carotid artery branch.

[0137] like Figure 18 As shown in the D6 box: a coated short tubular stent 7 (Gore VBX coated stent 3) is inserted into the innominate artery, and then the coated short tubular stent 7 (Gore VBX coated stent 3) is connected to the short tubular connector 42 away from the coated stent 3 (the Viabahn is inserted and the short tubular connector 42 corresponding to the innominate artery is released at the same time) to form an artificial brachiocephalic trunk branch 14.

[0138] The outer periphery of the roots of the two side short tubular joints 42 is provided with an anti-reflux ring, and the preset line of the anti-reflux ring is suspended and fixed (it can be undone first and then tied after the circulation is restored to shorten the stop circulation time).

[0139] like Figure 18 As shown in the D7 box: Suture the longitudinally cut aortic wall, and after exhausting, use the blocking clamp to block between the innominate artery and the left common carotid artery, and continuously suture the anti-reflux cap 6 and the proximal end a of the aortic arch. After suturing, briefly pause the circulation and exhaust the air, and then move the blocking clamp to the distal end b of the anti-reflux cap 6 and the innominate artery to block. Restore circulation again. During rewarming, the first regulating structure 12 can be adjusted as needed to adjust the length and curvature of the artificial blood vessel to ensure that the artificial blood vessel better matches the shape of the ascending aorta and avoid bending of the artificial blood vessel that affects blood flow. Then refer to the above Figure 17 The ascending aortic root was reconstructed in patients with aortic dissection. After the ascending aortic root was reconstructed, the circulation was opened, the heart was restarted, and finally, the artificial brachiocephalic trunk branch 14 was continuously sutured to the proximal end of the innominate artery. Bleeding was checked, puncture was continued, protamine was used to neutralize the bleeding, the ventilator was removed, hemostasis was achieved, a guide tube was placed, and the chest was closed as usual.

[0140] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An integrated stent-type artificial blood vessel, characterized in that: include: The artificial blood vessel portion includes an artificial blood vessel main branch, wherein the artificial blood vessel main branch is configured to correspond to the ascending aorta of the human body; a blood vessel segment connection device, disposed at the proximal end of the artificial blood vessel main branch, comprising a first-layer artificial blood vessel segment, an inner support ring disposed on the outer peripheral side of the proximal end of the first-layer artificial blood vessel segment, and a second-layer artificial blood vessel segment sleeved on the outer peripheral side of the first-layer artificial blood vessel segment, wherein the distal end of the first-layer artificial blood vessel segment is connected to the distal end of the second-layer artificial blood vessel segment, the proximal end of the first-layer artificial blood vessel segment and the proximal end of the second-layer artificial blood vessel segment being free ends, and the first-layer artificial blood vessel segment being connected to the artificial blood vessel main branch; The covered stent comprises a covered stent trunk connected to the main branch of the artificial blood vessel.

2. The integrated stent-type artificial blood vessel according to claim 1, characterized in that: The part of the artificial blood vessel main branch close to the blood vessel end connection device in its own axial direction is the proximal tube part, and the part away from the blood vessel end connection device is the artificial branch connection tube part. The periphery of the artificial branch connection tube part is connected to the artificial branch blood vessel.

3. The integrated stent-type artificial blood vessel according to claim 2, characterized in that: The outer periphery of the proximal tube portion is provided with a first adjustment structure for adjusting the axial length of the proximal tube portion; The first regulating structure comprises: a plurality of annular adjustment portions, each of which is spaced apart along the axial direction of the proximal tube portion, each of which includes a plurality of radially outwardly projecting members, each of which has a through hole formed therein, the through hole opening direction of which is the same as the axial direction of the proximal tube portion, the plurality of radially outwardly projecting members of each annular adjustment portion being spaced apart in the circumferential direction of the proximal tube portion; There are multiple spacing adjustment lines, each of which passes through the through hole of the radially outward protruding part between at least two different annular adjustment parts. The axial length and / or bending angle of the proximal tube part are adjusted by tightening or loosening the spacing adjustment line.

4. The integrated stent-type artificial blood vessel according to claim 3, characterized in that: The plurality of radially outwardly projecting parts of each annular adjusting portion are arranged on the same plane in the circumferential direction of the proximal tube portion. Furthermore, in the axial direction of the proximal tube portion, the plurality of radially outwardly protruding parts in all the annular adjustment portions are aligned into a plurality of rows to form a plurality of axial adjustment units.

5. The integrated stent-type artificial blood vessel according to claim 4, characterized in that: Each of the spacing adjustment lines adopts a U-shaped routing method to pass through at least two of the annular adjustment parts and pass through two axial adjustment units. The U-shaped bottom of the spacing adjustment line is set toward the distal end of the proximal tube part, and the two free ends of the spacing adjustment line are set toward the proximal end of the proximal tube part.

6. The integrated stent-type artificial blood vessel according to claim 1, characterized in that: In the naturally expanded state, the first artificial blood vessel segment and the corresponding portion of the inner support ring extend beyond the proximal end of the second artificial blood vessel segment, and the length of the first artificial blood vessel segment is greater than that of the second artificial blood vessel segment.

7. The integrated stent-type artificial blood vessel according to claim 1, characterized in that: In the naturally expanded state, the proximal end of the second layer of artificial blood vessel segment is flush with or exceeds the proximal end of the first layer of artificial blood vessel segment. The free end portion of the second layer artificial blood vessel segment close to the second layer artificial blood vessel segment forms the free end portion of the second layer artificial blood vessel segment, and a first outer shrinkage ring structure with an adjustable diameter is provided on the outer peripheral side of the free end portion of the second layer artificial blood vessel segment. The first outer shrinkage ring structure and the inner support ring overlap in the radial direction of the blood vessel end connection device to form a first clamping and leak-proof area.

8. The integrated stent-type artificial blood vessel according to claim 6, characterized in that: The blood vessel segment connection device further comprises a third layer of artificial blood vessel segment sleeved on the second layer of artificial blood vessel segment, wherein the distal end of the third layer of artificial blood vessel segment is connected to the second layer of artificial blood vessel segment and / or the first layer of artificial blood vessel segment. The proximal end of the third artificial blood vessel segment is a free end, the length of the third artificial blood vessel segment is greater than the length of the second artificial blood vessel segment, and the length of the third artificial blood vessel segment is equal to or greater than the length of the first artificial blood vessel segment.

9. The integrated stent-type artificial blood vessel according to claim 8, characterized in that: The inner support ring is adjustable in diameter and is arranged on the proximal outer peripheral side of the first layer of artificial blood vessel. The inner support ring is made of memory alloy. The inner support ring is a first cylindrical non-closed ring. The open ring of the inner support ring forms a relative and arc-shaped first wall groove and a first slot body in the circumferential direction of the inner support ring. The length of the first slot body in the circumferential direction of the inner support ring is less than the groove depth of the wall groove.

10. The integrated stent-type artificial blood vessel according to claim 9, characterized in that: The portion of the third-layer artificial blood vessel segment close to the proximal end of the third-layer artificial blood vessel segment forms the proximal end portion of the third-layer artificial blood vessel segment; A second outer shrink ring structure with an adjustable diameter is provided on the outer circumference of the proximal end of the third layer artificial blood vessel segment. The second outer shrink ring structure overlaps with the inner support ring in the radial direction of the blood vessel end connection device to form a second clamping and leak-proof area.

11. The integrated stent-type artificial blood vessel according to claim 10, characterized in that: The second outer shrink ring structure includes a restraining belt and a fastening assembly, wherein the fastening assembly includes a buckle head and a buckle hook respectively arranged at both ends of the restraining belt. After the buckle hook is hooked on the buckle head, the restraint belt becomes a ring. The circumference of the restraint belt ring is adjusted by the fastening assembly to adjust the diameter of the restraint belt ring.

12. The integrated stent-type artificial blood vessel according to claim 10, characterized in that: The second outer shrink ring structure is made of a memory alloy, the inner support ring is a second cylindrical non-closed ring, and the open ring of the second outer shrink ring structure forms a second wall groove and a second slot body that are opposite and arc-shaped and adapted to each other on the circumference of the second outer shrink ring structure, and the length of the second slot body on the circumference of the second outer shrink ring structure is less than the groove depth of the second wall groove; A plurality of slots are formed on the second wall groove along the circumference of the second outer shrink ring structure, and the second slot body is formed with latching teeth that match the shape of the slots. After the diameter of the second outer shrink ring structure is reduced, radial pressure is applied to the inner support ring through the latching and locking of the latching teeth and the slots.

13. The integrated stent-type artificial blood vessel according to claim 1, characterized in that: The stent graft comprises a left subclavian artery branch arranged beside the stent graft main trunk and connected to the stent graft main trunk. The integrated stent-type artificial blood vessel further comprises: A flexible connecting pipe segment is arranged between the artificial blood vessel part and the coated stent. The flexible connecting pipe segment includes a main pipe segment and a short side tubular joint arranged beside the main pipe segment and connected to the main pipe segment. In the main blood flow direction of the artificial blood vessel, the proximal end of the main pipe segment is connected to the main branch of the artificial blood vessel, and the distal end of the main pipe segment is connected to the proximal end of the main branch of the artificial blood vessel. The axial height of the short side tubular joint is less than the axial height of the branch of the left subclavian artery.

14. The integrated stent-type artificial blood vessel according to claim 13, characterized in that: The integrated stent-type artificial blood vessel also includes an anti-reflux cap, which is arranged around the periphery of the connection between the main branch of the artificial blood vessel and the main pipe section, and the cap opening of the anti-reflux cap faces the flexible connecting pipe section.

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