Blood vessel broken end connecting device

Abstract

The blood vessel broken end connecting device is provided with a multi-layer tubular structure, and the multi-layer tubular structure comprises an inner-layer artificial blood vessel section, a middle artificial blood vessel section and an outer-layer artificial blood vessel section which are coaxial and sequentially arranged from inside to outside. The far end of the middle artificial blood vessel section is connected with the far end of the outer-layer artificial blood vessel section and the part, close to the far end of the inner-layer artificial blood vessel section, of the inner-layer artificial blood vessel section, the near end of each tube section in the multi-layer tubular structure is a free end, and the near end part, close to the inner-layer artificial blood vessel section, of the inner-layer artificial blood vessel section forms the near end part of the inner-layer artificial blood vessel section; the inner support ring is arranged on the peripheral side of the near end part of the inner-layer artificial blood vessel section, and in a natural expansion state, the length of the middle artificial blood vessel section is smaller than that of the inner-layer artificial blood vessel section and smaller than that of the outer-layer artificial blood vessel section. According to the blood vessel broken end connecting device provided by the embodiment of the invention, the suture time and the suture difficulty in the aorta root reconstruction process can be well shortened, and meanwhile, the problem of blood leakage at the ascending aorta root reconstruction position is avoided.

Description

Technical Field

[0001] This application relates to the technical field of artificial blood vessel medical devices, and particularly to a blood vessel stump connection device. Background Art

[0002] Currently, it is difficult to reconstruct the root of the ascending aorta during type A aortic dissection surgery. This is mainly because the ascending aorta is relatively brittle and prone to rupture. Using manual suture to sew an artificial blood vessel to the root of the ascending aorta for reconstruction is difficult for the operator, and it is easy to leak blood at the suture during the open circulation of the operation, affecting the success rate of the operation and having a high bleeding risk at the reconstruction site. Utility Model Content

[0003] This application provides a blood vessel stump connection device.

[0004] The blood vessel stump connection device has a multi-layer tubular structure. The multi-layer tubular structure includes an inner-layer artificial blood vessel segment, a middle artificial blood vessel segment, and an outer-layer artificial blood vessel segment that are coaxially arranged and sequentially arranged from the inside out. The distal ends of the middle artificial blood vessel segment, the outer-layer artificial blood vessel segment, and the part of the inner-layer artificial blood vessel segment close to its own distal end are connected. The proximal ends of each pipe segment in the multi-layer tubular structure are free ends. Among them,

[0005] The part of the inner-layer artificial blood vessel segment close to the proximal end of the inner-layer artificial blood vessel segment forms the proximal end part of the inner-layer artificial blood vessel segment. An inner support ring is arranged on the outer peripheral side of the proximal end part of the inner-layer artificial blood vessel segment.

[0006] In the natural unfolded state, the length of the middle artificial blood vessel segment is less than the length of the inner-layer artificial blood vessel segment and less than the length of the outer-layer artificial blood vessel segment.

[0007] In some optional embodiments of this application, the axial length of the middle artificial blood vessel segment is 15 mm shorter than the length of the inner-layer artificial blood vessel segment.

[0008] In some optional embodiments of this application, in the natural unfolded state, the length of the outer-layer artificial blood vessel segment is equal to or greater than the length of the inner-layer artificial blood vessel segment.

[0009] In some optional embodiments of this application, the inner-layer artificial blood vessel segment is formed with a large-diameter pipe part and a small-diameter pipe part. The large-diameter pipe part is arranged corresponding to the position of the inner support ring. The diameter of the large-diameter pipe part is greater than the diameter of the small-diameter pipe part, and the connection between the large-diameter pipe part and the small-diameter pipe part is in a stepped shape.

[0010] In some optional embodiments of this application, the diameter of the large-diameter pipe part is 5% - 10% larger than the diameter of the small-diameter pipe part.

[0011] In some optional embodiments of this application, the inner support ring is arranged on the outer peripheral side of the proximal end part of the inner-layer artificial blood vessel segment with an adjustable and increasing diameter.

[0012] In some alternative embodiments of the present application, the inner support ring is made of a shape memory alloy. The inner support ring is a first cylindrical non-closed ring. At the open ring of the inner support ring, a first wall groove and a first slot body that are opposite and arc-shaped and adapted to each other are formed 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.

[0013] In some alternative embodiments of the present application, in the outer artificial blood vessel segment, the proximal part close to the outer artificial blood vessel segment forms the proximal end of the outer artificial blood vessel segment;

[0014] On the outer peripheral side of the proximal end of the outer artificial blood vessel segment, an outer shrinkage ring structure with an adjustable and reducible diameter is provided. The outer shrinkage ring structure and the inner support ring overlap in the radial direction of the blood vessel stump connecting device to form a clamping and leak-proof area.

[0015] In some alternative embodiments of the present application, the proximal end of the middle artificial blood vessel segment is on the side close to the distal ends of the respective pipe segments in the multi-layer tubular structure in the clamping and leak-proof area.

[0016] In some alternative embodiments of the present application, the outer shrinkage ring structure includes: a binding band and a fastening component. The fastening component includes a buckle and a hook respectively provided at both ends of the binding band.

[0017] After the hook is hooked on the buckle, the binding band forms a ring shape. The circumference of the ring formed by the binding band is adjusted by the fastening component to adjust the diameter of the ring formed by the binding band.

[0018] In some alternative embodiments of the present application, the outer shrinkage ring structure is made of a shape memory alloy. The inner support ring is a second cylindrical non-closed ring. At the open ring of the outer shrinkage ring structure, a second wall groove and a second slot body that are opposite and arc-shaped and adapted to each other are formed in the circumferential direction of the outer shrinkage ring structure. The length of the second slot body in the circumferential direction of the outer shrinkage ring structure is less than the groove depth of the second wall groove.

[0019] In some alternative embodiments of the present application, a plurality of card slots are formed along the circumferential direction of the outer shrinkage ring structure on the second wall groove. The second slot body is formed with teeth that match the shape of the card slots. After the diameter of the outer shrinkage ring structure is reduced, the inner support ring is radially pressed by the engagement and locking of the teeth and the card slots.

[0020] In some alternative embodiments of the present application, the axial lengths of the outer shrinkage ring structure and the inner support ring are equal and are both 1 cm to 1.5 cm.

[0021] In some alternative embodiments of the present application, the inner diameter of the outer shrinkage ring structure in the original state is less than or equal to the outer diameter of the inner support ring.

[0022] In some alternative embodiments of the present application, the proximal diameter of the middle artificial blood vessel segment is 2 mm larger than that of the proximal end of the inner artificial blood vessel segment, and the proximal diameter of the outer artificial blood vessel segment is 2 mm to 4 mm larger than that of the proximal end of the middle artificial blood vessel segment.

[0023] The blood vessel stump connection device provided by the embodiments of the present application mainly provides support and protection for the root of the ascending aorta by arranging three layers of artificial blood vessel segments and arranging an inner support ring on the outer peripheral side of the proximal end of the inner artificial blood vessel, so as to avoid blood vessel rupture and damage. The length of the middle artificial blood vessel segment is less than that of the inner artificial blood vessel segment and less than that of the outer artificial blood vessel segment. During the operation, the middle artificial blood vessel segment can be semi-sewn to the root of the ascending aorta first, and then the inner artificial blood vessel segment is pulled down so that the inner support ring supports the root of the ascending aorta, and then the inner artificial blood vessel segment, the middle artificial blood vessel segment and the root of the patient's own ascending aorta are fully sutured. The setting of the middle artificial blood vessel segment can avoid blood leakage between the inner artificial blood vessel and the ascending aorta wall. Finally, the outer artificial blood vessel segment is pulled down, and the proximal end of the outer artificial blood vessel segment is sealed with the inner support ring to further limit blood leakage between the inner support ring arranged on the outer periphery of the inner artificial blood vessel segment and the aortic wall. It completely ensures no blood leakage. The blood vessel stump connection device provided by the embodiments of the present application can well shorten the suture time and the difficulty of suturing during the reconstruction of the aortic root, reduce the requirements for the suture operation, avoid the blood leakage problem at the reconstruction site of the ascending aorta root at the same time, and improve the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the same type of aortic dissection;

[0025] Figure 2 It is a schematic diagram of the anatomical structure of the human aorta;

[0026] Figure 3 It is a simplified axial sectional structure diagram of the blood vessel stump connection device in the embodiments of the present application;

[0027] Figure 4 It is an exploded three-dimensional structure diagram of the blood vessel stump connection device in the embodiments of the present application;

[0028] Figure 5 It is a three-dimensional structure diagram of the blood vessel stump connection device in the embodiments of the present application;

[0029] Figure 6 It is a schematic diagram of the inner support ring structure in the blood vessel stump connection device in the embodiments of the present application;

[0030] Figure 7 It is a schematic diagram of an exemplary structure of the outer contraction ring structure in the blood vessel stump connection device in the embodiments of the present application;

[0031] Figure 8Another schematic structural diagram of the outer contraction ring structure in the blood vessel stump connection device according to the embodiment of the present application;

[0032] Figure 9 Schematic diagram of the process of ascending aorta reconstruction using the blood vessel stump connection device according to the embodiment of the present application.

[0033] Explanation of reference numerals:

[0034] Inner artificial blood vessel segment - 1; proximal end of the inner artificial blood vessel segment - 11; large-diameter tube portion - 12; small-diameter tube portion - 13; connection portion between the large-diameter tube portion and the small-diameter tube portion - 14;

[0035] Middle artificial blood vessel segment - 2;

[0036] Outer artificial blood vessel segment - 3; proximal end of the outer artificial blood vessel segment - 31;

[0037] Inner support ring - 4; first wall groove - 41; first socket body - 42;

[0038] Outer contraction ring structure - 5; binding band - 51; fastening assembly - 52; buckle head - 521; buckle hook - 522; second wall groove - 53; card slot - 531; second socket body - 54; card teeth - 541;

[0039] Proximal end - a; distal end - b. Detailed implementation manners

[0040] Next, the technical solution of the present application will be described in detail in conjunction with the attached Figures 1 to 9 For the technical solution of the present application.

[0041] In the embodiment of the present application, the description of the proximal end and the distal end of the structure 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.

[0042] Figure 1 Schematic 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. According to the different positions of the tear, it can be divided into Stanford type A and type B. 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 fatality rate is as high as 50%. For TAAD, the current guidelines recommend early open surgery to repair the torn aorta. However, open surgery usually requires median sternotomy and deep hypothermic circulatory arrest.

[0043] In the process of reconnecting and establishing a connection between the proximal end of the main branch of the artificial blood vessel and the root of the human autologous ascending aorta, since the ascending aorta blood vessel is brittle and prone to rupture, the traditional manual suture method of suturing the proximal end of the artificial blood vessel to the root of the ascending aorta to reconstruct the connection is difficult to operate for the operator. During the open circulation of the operation, blood leakage is likely to occur at the suture, affecting the success rate of the operation, and the bleeding risk at the reconstruction site is high.

[0044] Figure 2 It is a schematic anatomical structure diagram of the human aorta. From Figure 2 it can be seen that the aorta mainly presents an arched shape. The aorta includes the ascending aorta and the descending aorta. The innominate artery (connected to the right subclavian artery and the right common carotid artery, and the innominate artery can also be called the autologous brachiocephalic trunk branch), the left common carotid artery, and the left subclavian artery are formed on the large curvature side of the aortic arch.

[0045] As Figures 3 to 5 shown, the present application provides a blood vessel stump connection device,

[0046] The blood vessel stump connection device has a multi-layer tubular structure. The multi-layer tubular structure includes an inner layer artificial blood vessel segment, an intermediate artificial blood vessel segment 2, and an outer layer artificial blood vessel segment 3 that are coaxially arranged in sequence from the inside out. The distal end b of the intermediate artificial blood vessel segment 2, the distal end b of the outer layer artificial blood vessel segment 3, and the part of the inner layer artificial blood vessel segment close to its own distal end b are connected. The proximal end a of each pipe segment in the multi-layer tubular structure is a free end. Among them,

[0047] The part of the inner layer artificial blood vessel segment close to the proximal end of the inner layer artificial blood vessel segment forms the proximal end part of the inner layer artificial blood vessel segment. The inner support ring 4 is arranged on the outer peripheral side of the proximal end part of the inner layer artificial blood vessel segment.

[0048] In the natural unfolded state, the length of the intermediate artificial blood vessel segment 2 is less than the length of the inner layer artificial blood vessel segment and less than the length of the outer layer artificial blood vessel segment 3.

[0049] In the embodiments of the present application, the natural unfolded state of the artificial blood vessel segments of different layers refers to the state where the artificial blood vessel segments are not stretched or compressed axially when placed on a horizontal plane without external force (such as tensile force or pressure).

[0050] The vascular stump connection device provided by the embodiments of the present application is provided with three layers of artificial blood vessel segments, and an inner support ring 4 is arranged on the outer peripheral side of the proximal end of the inner artificial blood vessel segment, mainly providing support and protection for the root of the ascending aorta to avoid blood vessel rupture and damage. The length of the middle artificial blood vessel segment 2 is less than that of the inner artificial blood vessel segment and less than that of the outer artificial blood vessel segment 3. During the operation, the middle artificial blood vessel segment 2 can be semi-sewn to the root of the ascending aorta first, and then the inner artificial blood vessel segment is pulled down so that the inner support ring 4 supports the root of the ascending aorta, and then the inner artificial blood vessel segment, the middle artificial blood vessel segment 2 and the root of the patient's own ascending aorta are fully sutured. The setting of the middle artificial blood vessel segment 2 can avoid blood leakage between the inner artificial blood vessel segment and the ascending aorta wall. Finally, the outer artificial blood vessel segment 3 is pulled down, and the proximal end a of the outer artificial blood vessel segment 3 and the inner support ring 4 are sealed to further limit the blood leakage between the inner support ring 4 arranged on the outer peripheral side of the inner artificial blood vessel segment and the aortic wall, completely ensuring no blood leakage. The vascular stump connection device provided by the embodiments of the present application can well shorten the suture time and the suture difficulty during the reconstruction of the aortic root, reduce the requirements for suture operation, and at the same time avoid the blood leakage problem at the reconstruction site of the ascending aorta root, improving the surgical success rate.

[0051] In some alternative embodiments of the present application, in the natural unfolded state, the length of the outer artificial blood vessel segment 3 is equal to or greater than that of the inner artificial blood vessel segment.

[0052] In some alternative embodiments of the present application, the inner artificial blood vessel segment is formed with a large-diameter tube portion 12 and a small-diameter tube portion 13. The large-diameter tube portion 12 is arranged corresponding to the position of the inner support ring 4. The diameter of the large-diameter tube portion 12 is larger than that of the small-diameter tube portion 13, and the connection portion 14 between the large-diameter tube portion and the small-diameter tube portion is in a stepped shape.

[0053] In these embodiments, the design of the large-diameter tube portion 12 and the small-diameter tube portion 13 can ensure a better fitting effect between the inner artificial blood vessel segment and the root of the ascending aorta, and further improve the supporting effect of the inner support on the root of the ascending aorta, further reducing the possibility of blood leakage.

[0054] In some alternative embodiments of the present application, the diameter of the large-diameter tube portion 12 is 5% - 10% larger than that of the small-diameter tube portion 13.

[0055] In some alternative embodiments of the present application, the diameters of all parts of the first artificial blood vessel segment are equal in the axial direction.

[0056] In some alternative embodiments of the present application, the inner support ring 4 is a closed ring structure.

[0057] In some alternative embodiments of the present application, the inner support ring 4 is arranged on the outer peripheral side of the proximal end of the inner artificial blood vessel segment with an adjustable increased diameter.

[0058] As Figure 6 shown, in some alternative embodiments of the present application, the inner support ring 4 is made of a shape memory alloy. The inner support ring 4 is a first cylindrical non-closed ring. An open ring of the inner support ring 4 forms a first wall groove 41 and a first slot body 42 that are opposite and arc-shaped and adapted to each other in the circumferential direction of the inner support ring 4. The length of the first slot body 42 in the circumferential direction of the inner support ring 4 is less than the groove depth of the wall groove.

[0059] In some specific examples, the shape memory alloy is a special metal material that undergoes plastic deformation within a certain temperature range and can restore its original macroscopic shape within another temperature range. In the original state, the diameter of the inner support ring 4 is adapted to the inner diameter size of the root of the ascending aorta. Before implanting into the patient's body, the diameter of the inner support ring 4 is first reduced. Specifically, the inner support ring 4 is compressed inward under low-temperature conditions, the first slot body 42 penetrates deeper into the first wall groove 41, and the circumference of the inner support ring 4 decreases and thus the diameter becomes smaller. When implanted into the patient's body, the temperature environment where the inner support ring 4 is located is changed, so that the inner support ring 4 is restored from the original diameter-reduced state to the original state, and the first slot body 42 unfolds outward along the first wall groove 41 in the circumferential direction, thereby realizing the radial support effect on the root of the ascending aorta.

[0060] In some alternative embodiments of the present application, the proximal end portion 31 of the outer artificial blood vessel segment 3 close to the outer artificial blood vessel segment forms the proximal end portion 31 of the outer artificial blood vessel segment;

[0061] An outer contraction ring structure 5 with an adjustable and reducible diameter is provided on the outer peripheral side of the proximal end portion 31 of the outer artificial blood vessel segment. The outer contraction ring structure 5 and the inner support ring 4 overlap in the radial direction of the blood vessel end connection device to form a clamping and leakage prevention area.

[0062] It can be understood that the outer contraction ring structure is connected to the outer artificial blood vessel segment or the outer contraction ring structure and the outer artificial blood vessel segment are interactive and independent structures. When a clamping and leakage prevention area needs to be formed, the outer contraction ring structure is arranged on the outer peripheral side of the proximal end portion of the outer artificial blood vessel segment.

[0063] In some alternative embodiments of the present application, the proximal end a of the intermediate artificial blood vessel segment 2 is on the side of the clamping and leakage prevention area close to the distal ends b of the respective pipe segments in the multi-layer tubular structure.

[0064] As Figure 7 shown, in some alternative embodiments of the present application, the outer contraction ring structure 5 includes: a restraint band 51 and a fastening component 52. The fastening component 52 includes a buckle head 521 and a buckle hook 522 respectively arranged at both ends of the restraint band 51,

[0065] After the buckle hook 522 is hooked on the buckle head 521, the restraint band 51 forms a ring shape, and the circumference of the ring formed by the restraint band 51 is adjusted by the fastening component 52 to adjust the diameter of the ring formed by the restraint band 51.

[0066] As Figure 8 shown, in some alternative embodiments of the present application, the outer shrinkage ring structure 5 is made of shape memory alloy, the inner support ring 4 is a second cylindrical non-closed ring, and the open ring of the outer shrinkage ring structure 5 forms a second wall groove 53 and a second slot body 54 that are opposite and arc-shaped and adapted in the circumferential direction of the outer shrinkage ring structure 5. The length of the second slot body 54 in the circumferential direction of the outer shrinkage ring structure 5 is less than the groove depth of the second wall groove 53.

[0067] In some alternative embodiments of the present application, a plurality of card slots 531 are formed along the circumferential direction of the outer shrinkage ring structure 5 on the second wall groove 53, and the second slot body 54 is formed with teeth 541 that match the shape of the card slots 531. After the diameter of the outer shrinkage ring structure 5 is reduced, the inner support ring 4 is radially pressed by the engagement and locking of the teeth 541 and the card slots 531.

[0068] In some alternative embodiments of the present application, the axial lengths of the outer shrinkage ring structure 5 and the inner support ring 4 are equal and are both 1 cm to 1.5 cm.

[0069] In some alternative embodiments of the present application, the inner diameter of the outer shrinkage ring structure 5 in the original state is less than or equal to the outer diameter of the inner support ring 4.

[0070] In some alternative embodiments of the present application, the diameter of the proximal end a of the middle artificial blood vessel segment 2 is 2 mm larger than the diameter of the proximal end a of the inner artificial blood vessel segment 1, and the diameter of the proximal end a of the outer artificial blood vessel segment 3 is 2 mm to 4 mm larger than the diameter of the proximal end a of the middle artificial blood vessel segment 2.

[0071] Please refer to Figures 3 to 9 together, and the following specifically introduces the surgical process of the vascular stump connection device provided in the embodiments of the present application during ascending aortic root reconstruction:

[0072] As Figure 9 shown in the A frame of, in these embodiments, during the process of ascending aortic root reconstruction, first, routine disinfection and draping are performed, the internal jugular vein, the right dorsalis pedis artery, and the radial artery are cannulated, the right femoral artery and the right axillary artery are dissected and reserved, the chest is opened, the innominate artery, the left common carotid artery, and the left subclavian artery are dissected, the pericardium is suspended, after heparinization (3 ml / kg), the right femoral artery and the right axillary artery are selected, and extracorporeal circulation is established through the cannula. After the bypass machine is turned on, parallel cooling is performed, the aorta is blocked, the ascending aorta is dissected, the thrombus is cleared, and the complete height of the ascending aortic root is reserved at 2 cm (that is, the height between the sinus-tube junction and the distal edge b of the remaining ascending aorta after cutting). The left and right coronary arteries are perfused, the heart stops beating, the aortic root is treated (if the coronary artery or aortic valve needs to be treated with Bentall / David / Wheat), and the ascending aortic root reconstruction of aortic dissection is performed using the vascular stump connection device in the embodiments of the present application.

[0073] AsFigure 9 As shown in the B frame of , take the inner lining gasket (semicircular rectangular gasket, with a length equal to half of the circumference of the ascending aorta and a width of 1 cm), and fix the inner lining gasket to the rear half of the distal b edge of the ascending aorta root by running suture with 5-0 prolene thread. The inner lining gasket is located on the inner circumferential side of the ascending aorta root.

[0074] As Figure 9 As shown in the C frame of , here the inner artificial blood vessel segment 1 and the outer artificial blood vessel segment 3 retract, only exposing the middle artificial blood vessel segment. Apply 5-0 prolene thread to suture the middle artificial blood vessel segment 2, the distal b edge of the ascending aorta root, and the inner lining gasket (the three are overlapped and sutured for 5 mm) to the rear half of the tubular shape corresponding to the shape of the inner lining gasket, and tighten the suture to fix it first.

[0075] As Figure 9 As shown in the D frame of , then pull down the inner artificial blood vessel segment 1 so that the inner support ring 4 arranged on the outer circumferential side of the proximal end 11 of the inner artificial blood vessel segment is placed into the ascending aorta root until the distal b of the inner support ring 4 is flush with the sinotubular junction. The inner support ring 4 is expanded by changing the temperature or performing a dilating operation, and the diameter of the inner support ring 4 increases. Continue to suture the front half of the tube. At this time, the ascending aorta, the inner artificial blood vessel segment 1, and the middle artificial blood vessel segment 2 are sutured in full layer along the ascending aorta root. In the suture structure, from the outside to the inside are the middle artificial blood vessel segment 2, the ascending aorta root, and the inner artificial blood vessel segment 1. Here, the inner artificial blood vessel segment 1 acts as a gasket to fix the inner support ring 4, and the suture is completed.

[0076] Finally, pull down the outer artificial blood vessel segment 3, align the proximal end 31 of the outer artificial blood vessel segment with the proximal end 11 of the inner artificial blood vessel segment so that the outer contraction ring structure 5 and the inner support ring 4 overlap in the radial direction of the blood vessel end connection device to form a clamping and leakage prevention area. Control the reduction of the outer contraction ring structure 5 in the radial direction so that the outer contraction ring structure 5 and the inner support ring 4 form an interference fit in the clamping and leakage prevention area, and the outer contraction ring structure 5 and the inner support ring 4 restrict and fix each other, further avoiding blood leakage after the reconstruction of the ascending aorta root.

[0077] Figure 9 The E frame of shows the situation after the reconstruction of the ascending aorta root.

[0078] In some embodiments, when the outer shrinkage ring structure 5 includes a binding band 51 and a fastening assembly 52, the fastening assembly 52 includes a buckle 521 and a hook 522 respectively disposed at both ends of the binding band 51. When controlling the radial compression of the overlap between the outer shrinkage ring structure 5 and the inner support ring 4, after the hook 522 is hooked onto the buckle 521, the binding band 51 forms a ring, and the operator adjusts the circumference of the ring formed by the binding band 51 through the fastening assembly 52 to adjust the diameter of the ring formed by the binding band 51, so as to adjust the pressing effect of the outer shrinkage ring structure 5 on the inner support ring 4 and avoid blood leakage.

[0079] In other embodiments, when the outer shrinkage ring structure 5 is made of shape memory alloy, before being implanted into the patient's body, the diameter of the outer shrinkage ring structure 5 is first increased. When implanted into the patient's body, the ambient temperature of the outer shrinkage ring structure 5 is changed, so that the outer shrinkage ring structure 5 returns from the original enlarged diameter state to the original state, that is, the second slot body 54 moves deeply into the second wall groove 53 along the circumferential direction, so that the circumference of the outer shrinkage ring structure 5 decreases and the diameter becomes smaller. After reaching the expected diameter, the engagement and locking can be achieved by engaging the teeth 541 formed on the second slot body 54 into a certain slot 531 on the second wall groove 53, ensuring the pressing and binding effect of the outer shrinkage ring structure 5 on the inner support ring 4.

[0080] In some examples, the slotting direction of the slot 531 is inclined clockwise, and the extending direction of the tooth 541 is also inclined clockwise, so that the slot 531 and the tooth 541 can be clamped in the clockwise inclined direction.

[0081] Generally speaking, in the embodiments of the present application, by setting three coaxial artificial blood vessel segments, the inner support ring 4 on the outer peripheral side of the inner artificial blood vessel segment 1, and the lengths of the artificial blood vessel segments, problems such as difficult suture due to the brittle blood vessels at the root of the ascending aorta during the reconstruction of the root of the ascending aorta are avoided. The suture of the middle artificial blood vessel segment 2 restricts the blood leakage between the inner support ring 4 of the inner artificial blood vessel segment 1 and the ascending aorta wall. The outer artificial blood vessel segment 3 and the inner artificial blood vessel segment 1 are tightly pressed against each other through the interference fit between the inner support ring 4 and the outer shrinkage ring, further restricting the blood leakage between the inner support ring 4 provided on the outer peripheral side of the inner artificial blood vessel segment 1 and the aortic wall, achieving complete protection against blood leakage, while reducing the suture requirements, shortening the suture time, and improving the quality of the surgical completion.

[0082] The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A blood vessel stump connection device, characterized in that: The blood vessel stump connection device has a multi-layer tubular structure, which includes an inner artificial blood vessel segment, a middle artificial blood vessel segment and an outer artificial blood vessel segment which are coaxial and arranged in sequence from the inside to the outside, the distal end of the middle artificial blood vessel segment is connected to the distal end of the outer artificial blood vessel segment and the part of the inner artificial blood vessel segment close to its own distal end, and the proximal end of each tube segment in the multi-layer tubular structure is a free end, wherein, The proximal portion of the inner artificial blood vessel segment close to the inner artificial blood vessel segment forms the proximal portion of the inner artificial blood vessel segment, and the inner support ring is arranged on the outer peripheral side of the proximal portion of the inner artificial blood vessel segment. In a naturally expanded state, the length of the middle artificial blood vessel segment is shorter than the length of the inner artificial blood vessel segment, and shorter than the length of the outer artificial blood vessel segment.

2. The blood vessel stump connection device according to claim 1, characterized in that: In a naturally expanded state, the length of the outer artificial blood vessel segment is equal to or greater than the length of the inner artificial blood vessel segment.

3. The blood vessel stump connection device according to claim 1 or 2, characterized in that: In the naturally expanded state, the axial length of the middle artificial blood vessel segment is 15 mm shorter than the length of the inner artificial blood vessel segment.

4. The blood vessel stump connection device according to claim 1, characterized in that: The inner artificial blood vessel segment is formed with a large diameter tube portion and a small diameter tube portion, the large diameter tube portion is arranged corresponding to the position of the inner support ring, the diameter of the large diameter tube portion is larger than the diameter of the small diameter tube portion, and the connection between the large diameter tube portion and the small diameter tube portion is stepped.

5. The blood vessel stump connection device according to claim 4, characterized in that: The diameter of the large-diameter tube portion is 5% to 10% larger than the diameter of the small-diameter tube portion.

6. The blood vessel stump connection device according to claim 1, characterized in that: The inner support ring is arranged on the outer peripheral side of the proximal end portion of the inner layer artificial blood vessel segment so as to be adjustable and enlarged in diameter.

7. The blood vessel stump connection device according to claim 6, characterized in that: The inner support ring is made of memory alloy and is a first cylindrical non-closed ring. The open ring of the inner support ring forms a first wall groove and a first slot body that are opposite and arc-shaped and adapted to each other 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.

8. The blood vessel stump connection device according to claim 1 or 2, characterized in that: The proximal portion of the outer artificial blood vessel segment close to the proximal end of the outer artificial blood vessel segment forms the proximal end portion of the outer artificial blood vessel segment; An outer shrink ring structure with an adjustable diameter is arranged on the outer peripheral side of the proximal end of the outer artificial blood vessel segment. The outer shrink ring structure overlaps with the inner support ring in the radial direction of the blood vessel end connection device to form a clamping and leak-proof area.

9. The blood vessel stump connection device according to claim 8, characterized in that: The proximal end of the middle artificial blood vessel segment is located on one side of the clamping and leak-proofing area close to the distal ends of each tube segment in the multi-layer tubular structure.

10. The blood vessel stump connection device according to claim 8, characterized in that: The 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, and the circumference of the restraint belt ring is adjusted by the fastening assembly to adjust the diameter of the restraint belt ring.

11. The blood vessel stump connection device according to claim 8, characterized in that: The outer shrink ring structure is made of memory alloy, the inner support ring is a second cylindrical non-closed ring, and the open ring of the 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 circumferential direction of the outer shrink ring structure. The length of the second slot body in the circumferential direction of the outer shrink ring structure is less than the groove depth of the second wall groove.

12. The blood vessel stump connection device according to claim 11, characterized in that: A plurality of slots are formed on the second wall groove along the circumference of the outer shrink ring structure, and the second slot body is formed with latch teeth matching the shape of the slots. After the diameter of the outer shrink ring structure is reduced, radial pressure is applied to the inner support ring through the latching and locking of the latch teeth and the slots.

13. The blood vessel stump connection device according to claim 11, characterized in that: The axial lengths of the outer shrink ring structure and the inner support ring are equal and are both 1 cm to 1.5 cm.

14. The blood vessel stump connection device according to claim 11, characterized in that: The inner diameter of the outer shrink ring structure in an original state is smaller than or equal to the outer diameter of the inner support ring.

15. The blood vessel stump connection device according to claim 1, characterized in that: The proximal diameter of the middle artificial blood vessel segment is 2 mm larger than the proximal diameter of the inner artificial blood vessel segment, and the proximal diameter of the outer artificial blood vessel segment is 2 mm to 4 mm larger than the proximal diameter of the middle artificial blood vessel segment.

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