Blood vessel broken end connecting device

Abstract

The embodiment of the utility model provides a blood vessel broken end connecting device which comprises a first artificial blood vessel section provided with a near end of the first artificial blood vessel section and a far end of the first artificial blood vessel section, and the part, close to the near end of the first artificial blood vessel section, of the first artificial blood vessel section forms the near end of the first artificial blood vessel section; the inner supporting ring is arranged on the peripheral side of the near end part of the first artificial blood vessel section; the peripheral side of the first artificial blood vessel section is sleeved with the second artificial blood vessel section, the far end of the second artificial blood vessel section is connected with the far end of the first artificial blood vessel section, and the near end of the second artificial blood vessel section and the near end of the first artificial blood vessel section are free ends. Blood leakage between the first artificial blood vessel section and the ascending aorta wall is avoided, the suturing time and suturing difficulty in the aorta root reconstruction process can be well shortened, and the requirement for suturing operation is lowered.

Description

Technical Field

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

[0002] At present, it is difficult to reconstruct the ascending aorta root during A-type aortic dissection surgery. This is mainly because the ascending aorta is fragile and easy to rupture. It is difficult for the operator to sew the artificial blood vessel to the ascending aorta root to reconstruct the connection. In addition, it is easy to leak blood at the suture site during the operation to open the circulation, which affects the success rate of the operation and has a high risk of bleeding at the reconstruction site. Utility Model Content

[0003] The present application provides a blood vessel stump connection device, comprising:

[0004] A first artificial blood vessel segment, comprising a proximal end of the first artificial blood vessel segment and a distal end of the first artificial blood vessel segment, wherein a portion of the first artificial blood vessel segment close to the proximal end of the first artificial blood vessel segment forms a proximal portion of the first artificial blood vessel segment;

[0005] An inner support ring, which is arranged on the outer peripheral side of the proximal end portion of the first artificial blood vessel segment;

[0006] The second artificial blood vessel segment is sleeved on the outer peripheral side of the first artificial blood vessel segment, the distal end of the second artificial blood vessel segment is connected to the distal end of the first artificial blood vessel segment, and the proximal end of the second artificial blood vessel and the proximal end of the first artificial blood vessel segment are free ends.

[0007] In some optional embodiments of the present application, the first 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 that of the small diameter tube portion, and the connection between the large diameter tube portion and the small diameter tube portion is step-shaped.

[0008] In some optional embodiments of the present application, the diameter of the large-diameter tube portion is 5% to 10% larger than the diameter of the small-diameter tube portion.

[0009] In some optional embodiments of the present application, the inner support ring may be arranged on the outer peripheral side of the proximal end portion of the first artificial blood vessel segment with an increased diameter.

[0010] In some optional embodiments of the present application, the inner support ring is made of a memory alloy, and 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, and the length of the first slot body in the circumferential direction of the inner support ring is less than the groove depth of the first wall groove.

[0011] In some optional embodiments of the present application, in the naturally unfolded state,

[0012] The proximal end of the first artificial blood vessel segment is arranged beyond the proximal end of the second artificial blood vessel segment, and the length of the first artificial blood vessel segment is greater than the length of the second artificial blood vessel segment.

[0013] In some optional embodiments of the present application, in a naturally expanded state, the proximal end of the second artificial blood vessel segment and the distal end of the inner support ring are at the same position in the axial direction of the blood vessel end connecting device.

[0014] In some optional embodiments of the present application, in the naturally expanded state, the free end of the second artificial blood vessel segment is flush with the proximal end of the first artificial blood vessel segment, or the free end of the second artificial blood vessel segment is disposed beyond the proximal end of the first artificial blood vessel segment.

[0015] In some optional embodiments of the present application, the free end portion of the second artificial blood vessel segment close to the free end portion of the second artificial blood vessel segment forms the free end portion of the second artificial blood vessel segment;

[0016] An outer shrink ring structure with an adjustable diameter is arranged on the outer peripheral side of the free end of the second 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.

[0017] In some optional embodiments of the present application, 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.

[0018] 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.

[0019] In some optional embodiments of the present application, 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.

[0020] In some optional embodiments of the present application, the proximal diameter of the second artificial blood vessel segment is 2 mm to 4 mm larger than the proximal diameter of the first artificial blood vessel segment.

[0021] The blood vessel stump connection device provided in the embodiment of the present application, by setting two layers of artificial blood vessel segments, and setting an inner support ring on the outer peripheral side of the proximal end of the first artificial blood vessel segment, mainly provides support and protection for the root of the ascending aorta to avoid rupture and damage of the blood vessel. At the same time, the second artificial blood vessel segment is set on the outer peripheral side of the first artificial blood vessel segment. During the operation, the second artificial blood vessel segment can be half-sewn with the root of the ascending aorta, and then the first artificial blood vessel segment can be pulled down so that the inner support ring supports the root of the ascending aorta, and then the first artificial blood vessel segment, the second artificial blood vessel segment and the root of the patient's own ascending aorta are sutured in full layer. The setting of the second artificial blood vessel segment can avoid bleeding between the first artificial blood vessel segment and the ascending aorta wall. The blood vessel stump connection device provided in the embodiment of the present application can well shorten the suturing time and the difficulty of suturing during the reconstruction of the aortic root, reduce the requirements for suturing operations, and avoid bleeding problems at the reconstruction of the ascending aorta root, thereby improving the success rate of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the same type of aortic dissection;

[0023] Figure 2 This is a schematic diagram of the anatomical structure of the human aorta;

[0024] Figure 3 is a schematic structural diagram of a blood vessel stump connection device in one embodiment of the present application;

[0025] Figure 4 It is a schematic diagram of the structure of the inner support ring in one embodiment of the present application in front view and stereoscopic view;

[0026] Figure 5 This is a schematic diagram of the process of ascending aorta reconstruction using the blood vessel stump connection device according to an embodiment of the present application;

[0027] Figure 6 It is a schematic structural diagram of a blood vessel stump connecting device in another embodiment of the present application.

[0028] Description of reference numerals:

[0029] The first artificial blood vessel segment-1; the proximal end portion-11 of the first artificial blood vessel segment; the large diameter tube portion-12; the small diameter tube portion-13; the connection portion between the large diameter tube portion and the small diameter tube portion-14;

[0030] Inner support ring-2; first wall groove-21; first slot body-22;

[0031] Second artificial blood vessel segment-3;

[0032] External shrink ring structure-4; restraint belt-41; fastening assembly-42; buckle head-421; buckle hook-422;

[0033] Proximal end - a; distal end - b. DETAILED DESCRIPTION

[0034] The following will be combined with the attached Figures 1 to 6 The technical solution of this application is described in detail.

[0035] 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.

[0036] Figure 1 This is a 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. 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.

[0037] 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 reconnect it, the ascending aorta is relatively fragile and easy to rupture. The traditional manual suturing method of suturing the proximal end of the artificial blood vessel to the root of the ascending aorta to reconstruct 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 there is a high risk of bleeding at the reconstruction site.

[0038] Figure 2 This 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, and 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, the innominate artery can also be called a branch of the autologous brachiocephalic trunk), the left common carotid artery and the left subclavian artery formed on the greater curvature of the aortic arch.

[0039] like Figure 3 As shown, the embodiment of the present application provides a blood vessel stump connection device, comprising:

[0040] The first artificial blood vessel segment 1 has a proximal end a of the first artificial blood vessel segment 1 and a distal end b of the first artificial blood vessel segment 1, and the proximal end portion 11 of the first artificial blood vessel segment 1 near the first artificial blood vessel segment forms a proximal end portion 11 of the first artificial blood vessel segment;

[0041] An inner support ring 2, which is arranged on the outer peripheral side of the proximal end portion 11 of the first artificial blood vessel segment;

[0042] The second artificial blood vessel segment 3 is sleeved on the outer peripheral side of the first artificial blood vessel segment 1, the distal end b of the second artificial blood vessel segment 3 is connected to the distal end b of the first artificial blood vessel segment 1, and the proximal end a of the second artificial blood vessel and the proximal end a of the first artificial blood vessel segment 1 are free ends.

[0043] The blood vessel stump connection device provided in the embodiment of the present application is provided with two layers of artificial blood vessel segments, and an inner support ring 2 is provided on the outer peripheral side of the proximal portion 11 of the first artificial blood vessel segment, mainly to provide support and protection for the root of the ascending aorta to avoid rupture and damage of the blood vessel. At the same time, the second artificial blood vessel segment 3 is provided on the outer peripheral side of the first artificial blood vessel segment 1. During the operation, the second artificial blood vessel segment 3 can be half-sewn with the root of the ascending aorta, and then the first artificial blood vessel segment 1 can be pulled down so that the inner support ring 2 supports the root of the ascending aorta, and then the first artificial blood vessel segment 1, the second artificial blood vessel segment 3 and the root of the patient's own ascending aorta are sutured in full layer. The setting of the second artificial blood vessel segment 3 can avoid bleeding between the first artificial blood vessel segment 1 and the ascending aorta wall. The blood vessel stump connection device provided in the embodiment of the present application can well shorten the suturing time and the difficulty of suturing during the reconstruction of the aortic root, reduce the requirements for suturing operations, and avoid bleeding problems at the reconstruction of the ascending aorta root, thereby improving the success rate of the operation.

[0044] In some optional embodiments of the present application, the first artificial blood vessel segment 1 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 2, the diameter of the large diameter tube portion 12 is larger than the small diameter tube portion 13, and the connection 14 between the large diameter tube portion and the small diameter tube portion is step-shaped.

[0045] In these embodiments, the design of the large diameter tube portion 12 and the small diameter tube portion 13 can ensure a better fit between the first artificial blood vessel and the root of the ascending aorta, further enhance the supporting effect of the internal support on the root of the ascending aorta, and further reduce the possibility of bleeding.

[0046] In some optional embodiments of the present application, the diameter of the large-diameter tube portion 12 is 5% to 10% larger than the diameter of the small-diameter tube portion 13 .

[0047] In some optional embodiments of the present application, the first artificial blood vessel segment 1 is arranged with equal diameters at various locations in the axial direction.

[0048] In some optional embodiments of the present application, the inner support ring 2 is a closed ring structure.

[0049] like Figure 4 As shown, in some optional embodiments of the present application, the inner support ring 2 can be arranged on the outer peripheral side of the proximal end portion 11 of the first artificial blood vessel segment with an increased diameter.

[0050] In some optional embodiments of the present application, the inner support ring 2 is made of a memory alloy, and the inner support ring 2 is a first cylindrical non-closed ring. The open loop of the inner support ring 2 forms a relative and arc-shaped first wall groove 21 and a first slot body 22 in the circumferential direction of the inner support ring 2. The length of the first slot body 22 in the circumferential direction of the inner support ring 2 is less than the groove depth of the first wall groove 21.

[0051] In some specific examples, the memory alloy is a special metal material that can restore its original macroscopic shape in another temperature range after undergoing plastic deformation in a certain temperature range. In the original state, the diameter of the inner support ring 2 is adapted to the inner diameter size of the root of the ascending aorta. Before being inserted into the patient's body, the diameter of the inner support ring 2 is first reduced. Specifically, the inner support ring 2 is compressed inward under low temperature conditions, and the first slot body 22 penetrates into the first wall groove 21, and the circumference of the inner support ring 2 is reduced, thereby reducing the diameter. When inserted into the patient's body, the temperature environment of the inner support ring 2 is changed, so that the inner support ring 2 is restored from the original diameter reduction state to the original state, and the first slot body 22 is expanded outward along the circumference of the first wall groove 21, thereby achieving a radial support effect on the root of the ascending aorta.

[0052] In some optional embodiments of the present application, in the naturally unfolded state,

[0053] The proximal end 11 of the first artificial blood vessel segment is disposed beyond the proximal end a of the second artificial blood vessel segment 3 , and the length of the first artificial blood vessel segment 1 is greater than the length of the second artificial blood vessel segment 3 .

[0054] In some optional embodiments of the present application, in the naturally expanded state, the proximal end a of the second artificial blood vessel segment 3 and the distal end b of the inner support ring 2 are at the same position in the axial direction of the blood vessel end connecting device.

[0055] In the embodiment of the present application, the naturally expanded state of the artificial blood vessel segment refers to a state in which the artificial blood vessel segment is placed on a horizontal plane and is not stretched or compressed in the axial direction without the action of an external force (such as tension or pressure).

[0056] In some optional embodiments, in the naturally expanded state, the first artificial blood vessel segment 1 is 15 mm longer than the second artificial blood vessel segment.

[0057] like Figure 5As shown in 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, the right axillary artery is kept for standby, the thoracotomy, the innominate artery, the left common carotid artery, and the left subclavian artery are freed, the pericardium is suspended, the right femoral artery and the right axillary artery are selected after heparinization (3 ml / kg), and the cavo-atrial 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, the height of the complete ascending aorta root is retained to 2 cm (i.e., the height between the junction of the sinus tube and the edge b of the distal end of the ascending aorta remaining after cutting), the left and right coronary arteries are perfused, the heart is stopped, the aortic root is processed (the accumulated coronary artery or aortic valve requires Bentall / David / Wheat), and the vascular end connection device in the embodiment of the present application is used to reconstruct the ascending aorta root in aortic dissection.

[0058] 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 5-0 prolene mattress sutures, with the inner lining pad located on the inner circumference of the ascending aortic root.

[0059] Use 5-0prolene line to sew the second artificial blood vessel segment 3, the distal b edge of the ascending aorta root and the inner lining gasket (the three overlap and sew 5mm) to sew the tubular rear half corresponding to the shape of the inner lining gasket, tighten the sew to fix it first, and then pull down the first artificial blood vessel segment 1, so that the inner support ring 2 set on the outer peripheral side of the proximal end 11 of the first artificial blood vessel segment is placed in the ascending aorta root until the proximal end a of the inner support ring 2 is flush with the sinus tube junction, and the inner support ring 2 is expanded by changing the temperature or opening operation, and the diameter of the inner support ring 2 is increased, and the tubular front half is continued to be sutured and even the overall tubular structure is sutured along the circumferential direction. At this time, the ascending aorta, the first artificial blood vessel segment 1 and the second artificial blood vessel segment 3 are sutured in full layer along the ascending aorta root, and the suture structure is sequentially the second artificial blood vessel segment 3, the ascending aorta root and the first artificial blood vessel segment 1 from outside to inside. Here, the first artificial blood vessel segment 1 is equivalent to the gasket to fix the inner support ring 2, and the sew is completed.

[0060] like Figure 6 As shown, in some optional embodiments of the present application, in the naturally expanded state, the free end of the second artificial blood vessel segment 3 is flush with the proximal end a of the first artificial blood vessel segment 1 .

[0061] In some other optional embodiments, in the naturally expanded state, the free end of the second artificial blood vessel segment 3 is disposed beyond the proximal end a of the first artificial blood vessel segment 1, which is not shown in the figure.

[0062] In some optional embodiments of the present application, the free end portion of the second artificial blood vessel segment 3 close to the free end portion of the second artificial blood vessel segment 3 forms the free end portion of the second artificial blood vessel segment 3;

[0063] An outer shrink ring structure 4 with an adjustable diameter is arranged on the outer peripheral side of the free end of the second artificial blood vessel segment 3. The outer shrink ring structure 4 overlaps with the inner support ring 2 in the radial direction of the blood vessel end connection device to form a clamping and leak-proof area.

[0064] It can be understood that the outer contraction ring structure 4 is connected to the second artificial blood vessel segment 3 or the outer contraction ring structure 4 and the second artificial blood vessel segment 3 are interactive and independent structures. When a clamping and leak-proof area needs to be formed, the outer contraction ring structure 4 is arranged on the outer peripheral side of the free end of the second artificial blood vessel segment 3.

[0065] In some optional embodiments of the present application, the outer shrink ring structure 4 includes: a restraining belt 41 and a fastening assembly 42, wherein the fastening assembly 42 includes a buckle head 421 and a buckle hook 422 respectively arranged at both ends of the restraining belt 41.

[0066] After the buckle hook 422 is hooked on the buckle head 421 , the restraint belt 41 becomes a ring. The circumference of the ring of the restraint belt 41 is adjusted by the fastening assembly 42 to adjust the diameter of the ring of the restraint belt 41 .

[0067] In these embodiments, during the reconstruction of the ascending aorta root, routine disinfection and draping are first performed, the internal jugular vein, right dorsalis pedis artery and radial artery are pierced, the right femoral artery is freed, and the right axillary artery is reserved, the thoracotomy, the innominate artery, the left common carotid artery, and the left subclavian artery are freed, the pericardium is suspended, and the right femoral artery and the right axillary artery are selected after heparinization (3 ml / kg), and the caesarean cannula is used to establish extracorporeal circulation. After the machine is switched, the temperature is cooled in parallel, the aorta is blocked, the ascending aorta is opened, the thrombus is cleared, and the height of the complete ascending aorta root is retained to 2 cm (i.e., the height between the sinus-tubular junction and the distal edge b of the remaining ascending aorta after cutting), 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 in the embodiment of the present application is used to reconstruct the ascending aorta root in aortic dissection.

[0068] 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 5-0 prolene mattress sutures, with the inner lining pad located on the inner circumference of the ascending aortic root.

[0069] Use 5-0prolene line to sew the second artificial blood vessel segment 3 (the part of the second artificial blood vessel segment 3 on the side of the distal end b of the outer contraction ring structure 4), the distal end b edge of the ascending aorta root and the inner lining gasket (the three overlap and sew 5mm) to sew the tubular rear half corresponding to the shape of the inner lining gasket, tighten the sew to fix it first, and then pull down the first artificial blood vessel segment 1, so that the inner support ring 2 set on the outer peripheral side of the proximal end 11 of the first artificial blood vessel segment is placed in the ascending aorta root until the proximal end a of the inner support ring 2 is flush with the sinus tube junction, and the inner support ring 2 is expanded by changing the temperature or expanding the operation, and the diameter of the inner support ring 2 is increased, and the tubular front half is continued to be sutured. At this time, the ascending aorta, the first artificial blood vessel segment 1 and the second artificial blood vessel segment 3 are sutured along the ascending aorta root. From the outside to the inside in the suture structure, the second artificial blood vessel segment 3, the ascending aorta root and the first artificial blood vessel segment 1 are in turn. Here, the first artificial blood vessel segment 1 is equivalent to the gasket to fix the inner support ring 2, and the sew is completed. The outer contraction ring structure 4 and the inner support ring 2 are overlapped in the radial direction of the blood vessel stump connection device, and the diameter of the outer contraction ring structure 4 is controlled to decrease, thereby forming an interference fit with the inner support ring 2 with an increased diameter in the clamping and leak-proof area. The outer contraction ring structure 4 and the inner support ring 2 are mutually restricted and fixed, further avoiding bleeding problems after reconstruction of the ascending aorta root.

[0070] In some optional embodiments of the present application, the axial lengths of the outer shrink ring structure 4 and the inner support ring 2 are equal and are both 1 cm to 1.5 cm.

[0071] In some optional embodiments of the present application, the diameter of the proximal end a of the second artificial blood vessel segment 3 is 2 mm to 4 mm larger than the diameter of the proximal end a of the first artificial blood vessel segment 1 .

[0072] The blood vessel stump connection device provided in the embodiment of the present application is provided with two layers of artificial blood vessel segments, and an inner support ring 2 is provided on the outer peripheral side of the proximal portion 11 of the first artificial blood vessel segment, mainly to provide support and protection for the root of the ascending aorta to avoid rupture and damage of the blood vessel. At the same time, the second artificial blood vessel segment 3 is provided on the outer peripheral side of the first artificial blood vessel segment 1. During the operation, the second artificial blood vessel segment 3 can be half-sewn with the root of the ascending aorta, and then the first artificial blood vessel segment 1 can be pulled down so that the inner support ring 2 supports the root of the ascending aorta, and then the first artificial blood vessel segment 1, the second artificial blood vessel segment 3 and the root of the patient's own ascending aorta are sutured in full layer. The setting of the second artificial blood vessel segment 3 can avoid bleeding between the first artificial blood vessel segment 1 and the ascending aorta wall. The blood vessel stump connection device provided in the embodiment of the present application can well shorten the suturing time and the difficulty of suturing during the reconstruction of the aortic root, reduce the requirements for suturing operations, and avoid bleeding problems at the reconstruction of the ascending aorta root, thereby improving the success rate of the operation.

[0073] The above is only a specific implementation 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 a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A blood vessel stump connection device, characterized in that: include: A first artificial blood vessel segment, comprising a proximal end of the first artificial blood vessel segment and a distal end of the first artificial blood vessel segment, wherein a portion of the first artificial blood vessel segment close to the proximal end of the first artificial blood vessel segment forms a proximal portion of the first artificial blood vessel segment; An inner support ring, the inner support ring being arranged at the outer peripheral side of the proximal end portion of the first artificial blood vessel segment; The second artificial blood vessel segment is sleeved on the outer peripheral side of the first artificial blood vessel segment, the distal end of the second artificial blood vessel segment is connected to the distal end of the first artificial blood vessel segment, and the proximal end of the second artificial blood vessel and the proximal end of the first artificial blood vessel segment are free ends.

2. The blood vessel stump connection device according to claim 1, characterized in that: The first 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.

3. The blood vessel stump connection device according to claim 2, 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.

4. The blood vessel stump connection device according to claim 1, characterized in that: The inner support ring is arranged on the outer circumference of the proximal end of the first artificial blood vessel segment with an increased diameter.

5. The blood vessel stump connection device according to claim 4, 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 first wall groove.

6. The blood vessel stump connection device according to claim 1, characterized in that: In its natural unfolded state, The proximal end of the first artificial blood vessel segment is arranged beyond the proximal end of the second artificial blood vessel segment, and the length of the first artificial blood vessel segment is greater than the length of the second artificial blood vessel segment.

7. The blood vessel stump connection device according to claim 6, characterized in that: In the naturally expanded state, the proximal end of the second artificial blood vessel segment and the distal end of the inner support ring are at the same position in the axial direction of the blood vessel end connecting device.

8. The blood vessel stump connection device according to claim 1, characterized in that: In the naturally expanded state, the free end of the second artificial blood vessel segment is flush with the proximal end of the first artificial blood vessel segment, or, The free end of the second artificial blood vessel segment is disposed beyond the proximal end of the first artificial blood vessel segment.

9. The blood vessel stump connection device according to claim 8, characterized in that: The free end portion of the second artificial blood vessel segment close to the second artificial blood vessel segment forms a free end portion of the second artificial blood vessel segment; An outer shrink ring structure with an adjustable diameter is arranged on the outer peripheral side of the free end of the second 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.

10. The blood vessel stump connection device according to claim 9, 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 10, 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.

12. The blood vessel stump connection device according to claim 10, characterized in that: The proximal diameter of the second artificial blood vessel segment is 2 mm to 4 mm larger than the proximal diameter of the first artificial blood vessel segment.

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