Threaded buckle type aorta blood vessel anastomat and working method

Abstract

The invention relates to a thread buckle type aorta blood vessel anastomat and a using method thereof, and the thread buckle type aorta blood vessel anastomat comprises five components, namely an outer female ring, two outer rings and two inner rings; the two inner rings are the same in size and structure, and the ends, close to each other, of the two blood vessels are turned outwards and sleeved on the inner rings. The two outer rings are an annular buckle type outer ring and a threaded type outer ring respectively, two sections of blood vessels with the ends turned outwards are clamped between the inner walls of the annular buckle type outer ring and the threaded type outer ring and the outer wall of the inner ring respectively, and the inner wall of the outer female ring is connected with the outer walls of the annular buckle type outer ring and the threaded type outer ring in a threaded or clamped mode. The aim of clamping the blood vessel to prevent the blood vessel from loosening is achieved; the blood vessel suturing time can be greatly shortened, and the workload of medical staff is reduced; the thrombus risk of a patient due to the fact that the non-degradable anastomat is located in a blood vessel for a long time is avoided; and damage to the blood vessel wall caused by traditional suture suture is avoided.

Description

Technical Field

[0002] The present invention relates to the field of medical devices, and particularly to a medical device for rapid anastomosis of aortic blood vessels, namely a screw snap-type aortic blood vessel anastomosis device and its usage method. Background Art

[0004] As an indispensable core part of the circulatory system in the living body, the precise anastomosis of blood vessels plays a crucial role in the treatment of cardiovascular diseases. Although the traditional suture stitching technique has been widely applied due to its economy and certain applicability, its high operation complexity, long time consumption, and easy occurrence of blood vessel wall damage and poor biocompatibility problems have become the key factors restricting the surgical effect and recovery speed. Therefore, the research and development of new blood vessel anastomosis techniques focus on achieving rapid and high-quality anastomosis, aiming to fundamentally reduce surgical trauma and improve the prognosis of patients. The core of this innovative pursuit lies in simplifying the operation process, lowering the technical threshold, while ensuring that the accuracy, stability, and biological safety of the anastomosis all reach the optimal level. That is, while maximizing time efficiency, ensuring the flawless quality of blood vessel anastomosis, thus achieving the rapidity of the surgery while also guaranteeing the safety and effectiveness of the treatment, and minimizing the potential harm of the surgery to the body.

[0005] Currently, the field of blood vessel anastomosis has witnessed multiple technological innovations, with the emergence of diversified innovative techniques such as mechanical closure devices, biological glue adhesion, and laser and high-frequency electrocoagulation heat welding methods. These advancements have greatly accelerated the surgical process and simplified the operation complexity. However, each technique is accompanied by its inherent challenges and potential risks: for example, although biological glue simplifies the suture operation and reduces the complication risk, the verification of its long-term biocompatibility and stability is still in progress; while the heat welding technique, although novel and efficient, requires careful control to avoid unnecessary thermal damage to the blood vessel wall; mechanical closure devices usually use metal as the material, which will cause patients to be unable to perform medical examinations such as MR and CT during the period of wearing the anastomosis device, and will have a certain impact on the postoperative rehabilitation evaluation of patients. And the mechanically closed degradable anastomosis device made of polymer can eliminate the drawbacks of the above several anastomosis methods and reduce the inconvenience to patients caused by blood vessel anastomosis.

[0006] In this context, the blood vessel anastomosis device with precise mechanical design stands out among numerous technologies with its remarkable advantages of rapidity, safety, reliability, and simple operation, and becomes a powerful candidate for solving the limitations of the existing technologies.

[0007] Currently, the Chinese patent "A Vascular Anastomosis Device" with the publication number CN113143370B has been retrieved. This vascular anastomosis device includes an anastomosis ring and multiple anastomosis bolts. The middle part of the anastomosis ring is provided with an axial anastomosis ring inner cavity. One end of the bypass vessel passes through the anastomosis ring inner cavity and then turns outwards to the front end face of the anastomosis ring. A plurality of axial through holes are provided on the outer periphery of the anastomosis ring inner cavity, with one through hole corresponding to one anastomosis bolt. The anastomosis bolt sequentially passes through the through hole, the bypass vessel, and the aorta to fixedly connect the bypass vessel and the aorta. The vascular anastomosis device provided by the present invention has a simple structure, is easy to operate, has a good vascular anastomosis effect, and can minimize the anastomosis time and complications of blood vessels to the greatest extent during application; by setting the anastomosis ring, the installation of the bypass vessel can be realized, and by setting the anastomosis bolt, the anastomosis of the bypass vessel and the aorta can be realized; however, it cannot achieve the series connection of the ends of two blood vessels.

[0008] In addition, the Chinese patent "A Vascular Anastomosis Device" with the publication number CN113749709B has been retrieved. This vascular anastomosis device includes a left needle pusher, a right needle pusher, and a central unit for docking two blood vessels; the central unit includes a sliding part in the middle and docking parts at both ends for docking with blood vessels; several groups of needle-passing parts are circumferentially spaced on the central unit, and each group of needle-passing parts includes a left needle-passing part and a right needle-passing part arranged left and right; both the left needle-passing part and the right needle-passing part are provided with suture needles, and the two corresponding suture needles in each group are connected by the same suture thread; the left needle pusher and the right needle pusher are slidably sleeved on the sliding part; the left needle pusher and the right needle pusher are respectively provided with needle-pushing parts for pushing the suture needles out from the docking part. Compared with traditional vascular anastomosis devices, this vascular anastomosis device ensures the unity of the docking at both ends, reduces the corresponding operation steps, and reduces the pain of patients; under the action of external force, the left needle pusher and the right needle pusher can simultaneously push the suture needles through the blood vessels at both ends to realize the threading operation, which is simple to operate, and has high docking efficiency and accuracy; although this vascular anastomosis device realizes the series connection of the ends of two blood vessels, it still uses suture thread for sewing, and the sewing efficiency is still low. Summary of the Invention

[0010] Aiming at the problems existing in the existing anastomosis devices, the purpose of the present invention is to provide a screw snap-type aortic vascular anastomosis device, which can be used for the rapid series connection of the ends of two aortic blood vessels.

[0011] In order to achieve the above purpose, the technical solution of the present invention is: The screw snap - type aortic vascular anastomosis device of the present invention is characterized in that: the aortic vascular anastomosis device includes five components, namely an outer female ring, two outer rings and two inner rings; the two inner rings are of the same size and structure, and the end portions of the two mutually approaching blood vessels are turned outwards and sleeved on the inner rings; the two outer rings are respectively an annular snap - type outer ring and a screw - type outer ring, and the two end - portions of the blood vessels with turned - out ends are respectively clamped between the inner walls of the annular snap - type outer ring and the screw - type outer ring and the outer walls of the inner rings, and the inner wall of the outer female ring is connected or snapped with the outer walls of the annular snap - type outer ring and the screw - type outer ring through threads, so as to realize the close fitting of the mutually approaching ends of the two blood vessels by the relative approach of the annular snap - type outer ring and the screw - type outer ring.

[0012] Further, the above - mentioned inner ring is of a tubular structure, and the inner wall of the inner ring is a cylindrical surface parallel to the central axis of the inner ring; the outer wall of the inner ring is a first conical surface formed at an angle of 15° with the central axis of the inner ring; the first conical surface can cooperate with the inner wall of the outer ring to clamp and fix the blood vessel.

[0013] Further, the above - mentioned annular snap - type outer ring is of a tubular structure, and the inner wall of the annular snap - type outer ring is a second conical surface formed at an angle of 15° with the central axis of the annular snap - type outer ring, and the second conical surface and the first conical surface fix the blood vessel sleeved on the inner ring in the anastomosis device through extrusion.

[0014] Further, the above - mentioned screw - type outer ring is of a tubular structure, and the inner wall of the screw - type outer ring is a third conical surface formed at an angle of 15° with the central axis of the screw - type outer ring, and the third conical surface and the first conical surface fix the blood vessel sleeved on the inner ring in the anastomosis device through extrusion.

[0015] Further, the above - mentioned outer female ring is a thin - walled circular tube; three annular grooves are opened at the top of the inner wall of the outer female ring, and a partial section of the annular groove extends to the top end surface of the outer female ring; three annular protrusions for snap - type limit matching with the annular groove are provided at the bottom of the outer wall of the annular snap - type outer ring; a first regular hexagonal boss is provided at the top of the outer wall of the annular snap - type outer ring, and the first regular hexagonal boss facilitates the rotation of the annular snap - type outer ring.

[0016] Further, a thread groove is opened at the bottom of the inner wall of the outer female ring; a thread line capable of being thread - fitted and screwed with the thread groove is provided at the bottom of the outer wall of the screw - type outer ring; a second hexagonal boss is provided at the top of the screw - type outer ring, and the second hexagonal boss facilitates the rotation of the screw - type outer ring.

[0017] Further, an arc - shaped boss is provided at the starting end of the annular groove at the top of the outer female ring.

[0018] Furthermore, the thread of the threaded outer ring is provided with a helix angle of 2-5 degrees; so as to achieve thread self-locking by the mutual friction and extrusion between the threaded outer ring and the outer female ring, and prevent loosening and falling off between the threaded outer ring and the outer female ring.

[0019] Furthermore, the surfaces of the inner ring and the outer ring that contact the blood vessel are both provided with transition fillets to prevent cutting the blood vessel wall and causing secondary damage.

[0020] The using method of the screw snap-type aortic vascular anastomosis device of the present invention is characterized in that: Step 1: First, pass two sections of blood vessels through the inner walls of the annular snap-type outer ring and the threaded outer ring respectively; Step 2: Then take out two inner rings, pass two sections of blood vessels through the inner walls of the inner rings respectively, and turn the blood vessels outwards to expose the inner walls of the blood vessels. At the same time, it is necessary to ensure that there is an extra part of the blood vessel on the first conical surface of the outer circle of the inner ring; Step 3: First, match the annular snap-type outer ring with the outer female ring, and at the same time ensure that the blood vessel on the first conical surface of the outer circle of the inner ring is preliminarily attached to the second conical surface of the inner circle of the annular snap-type outer ring; Step 4: Match the thread of the threaded outer ring with the thread groove of the outer female ring and rotate the threaded outer ring. When the blood vessel on the first conical surface of the outer circle of the inner ring is attached to the third conical surface of the inner circle of the threaded outer ring, it can be stopped. Then rotate the annular snap-type outer ring and the threaded outer ring at the same time to ensure that the blood vessels on the two inner rings can be closely attached.

[0021] At the connection between the two outer rings and the outer female ring of the present invention, there are mutually matching annular structures or threads; the outer wall of the inner ring and the inner walls of the two outer rings are designed with mutually parallel conical surfaces to clamp the blood vessel, and the axial cooperation and fixation of the anastomosis device are realized through the outer ring and the outer female ring; there is an arc convex platform in the annular groove of the outer female ring, and the circumferential fixation of the annular snap-type outer ring is realized through the arc convex platform to prevent loosening and falling off; the outer female ring realizes the self-locking phenomenon with the threaded outer ring by setting a smaller thread angle angle to complete the circumferential positioning. The aortic vascular anastomosis device of the present invention can be applied to most clinical cardiovascular surgeries, and at the same time can greatly reduce the time of blood vessel anastomosis and reduce the risk of secondary infection of patients.

[0022] The present invention has the following advantages and effects compared with the prior art: 1. The present invention adopts a clamping mechanism with conical surfaces where the outer wall of the inner ring is parallel to the inner wall of the outer ring to firmly hold the blood vessels for anastomosis. This innovative design completely abandons the blood vessel puncture step in traditional suture methods, thus effectively preventing the risk of blood vessel tearing that may be caused by stress concentration during the puncture process. At the same time, by achieving a tight fit of the inner walls of the blood vessels, the present invention greatly promotes the rapid healing and recovery process of blood vessel tissues. Further, the annular structures and threads on the outer ring and the outer mother ring not only enhance the stability of the anastomosis but also significantly improve the convenience of operation for medical staff, making the surgical process smoother and greatly saving valuable surgical time. Since clinical surgeries related to the heart often require large blood vessel anastomosis, and surgeries related to the heart generally establish an extracorporeal circulation support system for the patient and make the heart temporarily stop pumping blood, shortening the blood vessel anastomosis time is of great benefit to the patient.

[0023] 2. The present invention sets arc-shaped protrusions in the annular groove of the outer mother ring and designs a smaller thread angle at the other end of the outer mother ring. This innovative design ensures a tight connection between the outer ring and the outer mother ring and effectively prevents loosening, thus greatly reducing the risk of blood leakage during the surgical process. Compared with traditional puncture suture methods, its reliability has been significantly improved. In addition, the design of the inner ring fully considers the actual size of the blood vessels. Its inner diameter precisely matches the size of the blood vessels, and the surface is smooth without protrusions. Such a design minimizes the natural obstruction of the anastomosis device to blood flow and effectively reduces the risk of thrombosis and blood vessel blockage caused by poor blood flow. Moreover, all corners of the present invention adopt transitional rounded corner treatments. This detailed design not only improves the overall aesthetics of the product but more importantly effectively prevents possible accidental injuries to the human body caused by sharp corners, further enhancing the safety of the surgical process.

[0024] 3. The present invention is made of PC-ISO material, which has the characteristic of natural degradation in the human body with body fluids. Currently, anastomosis devices on the market are usually made of non-degradable materials, which will narrow the diameter of the blood vessel connection. Due to the different diameters of blood vessels, blood clots are likely to form. However, the anastomosis device made of degradable material will slowly decompose with body fluids, ensuring that the diameters of the patient's blood vessels are consistent and eliminating postoperative complications of the patient.

[0025] The following further elaborates on the present invention in detail in conjunction with the accompanying drawings and specific embodiments. Description of the Drawings

[0026] Figure 1 is a three-dimensional structural schematic diagram of the assembly of the present invention; Figure 2 is a sectional schematic diagram of the assembly of the present invention; Figure 3 is a three-dimensional schematic diagram of the annular snap-on outer ring of the present invention; Figure 4 It is a schematic cross-sectional view of the annular snap-on outer ring of the present invention; Figure 5 It is a three-dimensional schematic view of the threaded outer ring of the present invention; Figure 6 It is a schematic cross-sectional view of the threaded outer ring of the present invention; Figure 7 It is a three-dimensional schematic view of the outer female ring of the present invention; Figure 8 It is a schematic view of the arc-shaped convex platform of the outer female ring of the present invention; Figure 9 It is a perspective view of the function of the arc-shaped convex platform of the outer female ring of the present invention; Figure 10 It is a three-dimensional schematic view of the inner ring of the present invention; Figure 11 It is a schematic cross-sectional view of the inner ring of the present invention; Figure 12 It is a schematic view of the first step of the stapler assembly of the present invention; Figure 13 It is a schematic view of the second step of the stapler assembly of the present invention; Figure 14 It is a schematic view of the third step of the stapler assembly of the present invention; Figure 15 It is a stress simulation diagram of the blood vessel when the compression deformation amount of the blood vessel reaches 20% of the present invention; Figure 16 It is a stress simulation diagram of the blood vessel when the axial displacement of the stapler is 1 mm of the present invention; In the figure: 1 - Threaded outer ring, 2 - Outer female ring, 3 - Annular snap-on outer ring, 4 - Inner ring, 5 - Blood vessel, 6 - First regular hexagonal convex platform, 7 - Annular protrusion, 8 - Second conical surface, 9 - Thread line, 10 - Second regular hexagonal convex platform, 11 - Third conical surface, 12 - Thread groove, 13 - Annular groove, 14 - Arc-shaped convex platform, 15 - Transition fillet, 16 - First conical surface. Specific embodiments

[0028] The present invention will be further described in detail below in conjunction with the embodiments and the drawings, but the embodiments of the present invention are not limited thereto.

[0029] The present invention relates to a screw snap - type aortic vascular anastomosis device, which is used for vascular suture in cardiovascular clinical operations. The aortic vascular anastomosis device has a total of five components, namely an outer female ring 2, two outer rings, and two inner rings 4. The two inner rings 4 are of the same size and structure, and the end of the blood vessel 5 can be turned outwards and sleeved on the inner ring 4. The structures of the two outer rings are slightly different, so the outer rings are divided into an annular snap - type outer ring 3 and a screw - type outer ring 1. Through the structural design between the annular snap - type outer ring 3 and the screw - type outer ring 1 and the inner ring 4 respectively, the blood vessel 5 is clamped and fixed between the inner ring 4 and the annular snap - type outer ring 3 or the screw - type outer ring 1.

[0030] The ends of the two mutually - approaching blood vessels are turned outwards and sleeved on the inner ring 4. The two blood vessels with turned - out ends are respectively clamped between the inner walls of the annular snap - type outer ring 3 and the screw - type outer ring 1 and the outer wall of the inner ring 4. The inner wall of the outer female ring 2 is connected to the outer walls of the annular snap - type outer ring 3 and the screw - type outer ring 1 by screw connection or snap connection (in one embodiment, the inner wall of the outer female ring 2 is provided with threads, and the outer walls of the annular snap - type outer ring 3 and the screw - type outer ring 1 are correspondingly provided with threads. By rotating the annular snap - type outer ring 3 and the screw - type outer ring 1 relative to the outer female ring 2 through screw connection, the relative approach of the annular snap - type outer ring 3 and the screw - type outer ring 1 is realized; in another embodiment, the inner wall of the outer female ring 2 is provided with a wedge - shaped snap, and the outer walls of the annular snap - type outer ring 3 and the screw - type outer ring 1 are correspondingly provided with snaps that can be snap - connected to the wedge - shaped snap. By snap - connecting the annular snap - type outer ring 3 and the screw - type outer ring 1 relative to the outer female ring 2, the relative approach of the annular snap - type outer ring 3 and the screw - type outer ring 1 is realized. The specific embodiments of the present application will be described in detail later), so as to drive the relative approach of the annular snap - type outer ring 3 and the screw - type outer ring 1 by the outer female ring 2 to realize the tight fitting of the two mutually - approaching ends of the blood vessels.

[0031] All five components in the aortic vascular anastomosis device of the present invention are designed on the basis of cylinders (i.e., circular tubes) with through - holes. The purpose is to be able to be consistent with the shape of the blood vessel 5 and at the same time facilitate the installation of the anastomosis device in a narrow space.

[0032] Specifically, the inner ring 4 is a tubular structure, and the inner ring 4 is divided into an inner wall and an outer wall. The inner wall of the inner ring is a cylindrical surface coaxial with the central axis of the inner ring. The outer wall of the inner ring forms a first conical surface 16 (i.e., the taper is 15 degrees) with an angle of 15° with the central axis of the inner ring. The function of the first conical surface is to form a clamping fit with the inner walls of the outer rings (including the annular snap - type outer ring 3 and the screw - type outer ring 1) to fix the blood vessel 5.

[0033] Specifically, the annular snap-on outer ring 3 is a tubular structure. The inner wall of the annular snap-on outer ring 3 forms a 15° angle with the central axis of the annular snap-on outer ring 3 to form a second conical surface 8 with the same angle as the first conical surface 16 of the inner ring 4. The purpose of this second conical surface 8 is to be able to fix the blood vessel 5 sleeved on the inner ring 4 through extrusion with this second conical surface 8, thereby realizing the fixation of the blood vessel 5 in the stapler.

[0034] A similar third conical surface 11 is provided on the inner wall of the threaded outer ring 1. The function of this third conical surface 11 is the same as that of the second conical surface 8 on the inner wall of the annular snap-on outer ring 3. Specifically, the threaded outer ring 1 is a tubular structure, and the inner wall of the threaded outer ring 1 forms a 15° angle with the central axis of the threaded outer ring 1 to form the third conical surface 11. The third conical surface 11 and the first conical surface 16 fix the everted blood vessel sleeved on the inner ring through extrusion in the stapler.

[0035] The taper of the first conical surface 16, the second conical surface 8, and the third conical surface 11 can also be other degrees, such as 12 degrees, 20 degrees, etc.

[0036] When the assembly is completed as Figure 2 shown, the first conical surface 16 on the outer wall of the inner ring 4 should be slightly smaller than the second conical surface 8 and the third conical surface 11 on the inner walls of the annular snap-on outer ring 3 and the threaded outer ring 1; the distance between the first conical surface and the second conical surface 8, and the distance between the first conical surface and the third conical surface 11 should be slightly smaller than the thickness of the blood vessel 5, so as to prevent blood leakage caused by the loosening of the blood vessel when clamping the blood vessel wall.

[0037] Among them, the outer female ring 2 is a thin-walled cylinder (i.e., a thin-walled circular tube); at the top of the inner wall of the outer female ring 2 (i.e., the left part as shown Figure 7 ), three annular grooves 13 are opened; a partial section of the annular groove 13 extends to the top surface of the outer female ring 2 (i.e., the left end surface as shown Figure 7 ), and at the bottom of the inner wall of the outer female ring 2 (i.e., the right part as shown Figure 7 ), a threaded groove 12 is opened; the designs of the three annular grooves 13 and the threaded groove 12 in the inner wall of the outer female ring 2 are all for facilitating the cooperation of the annular snap-on outer ring 3, the threaded outer ring 1, and the outer female ring 2.

[0038] At the bottom of the outer wall of the annular snap-on outer ring 3, three annular protrusions 7 for snap-fit and limit with the annular groove 13 are provided, and the annular protrusions 7 have the same inclination angle as the annular groove 13 of the outer female ring, and the total length of the annular groove 13 should be at least twice the length of the annular protrusion 7, and the length of the partial section of the annular groove 13 extending to the top surface of the outer female ring 2 should also be at least equal to the length of the annular protrusion 7; at the top of the outer wall of the annular snap-on outer ring, a first regular hexagon boss 6 is provided, and its function is to facilitate the rotation of the annular snap-on outer ring 3.

[0039] When assembling the annular snap - type outer ring 3 and the outer female ring 2, the annular protrusion 7 is first aligned with the annular groove 13 and extended into the partial section position on the top surface of the outer female ring 2 for sleeving. Then, after the two are rotated by a certain angle (such as the circumferential angle of the annular protrusion 7), the assembly limit of the two is achieved.

[0040] At the bottom of the outer wall of the threaded outer ring 1, there is a thread line 9 that can be thread - fitted and screwed with the thread groove 12. This thread line 9 can form a rotational fit with the thread groove 12 at the bottom of the outer female ring 2; at the top of the threaded outer ring 1, there is a second hexagonal boss 10, whose function is the same as that of the first regular hexagonal boss 6 of the annular snap - type outer ring 3, and it also makes the operation of the stapler convenient.

[0041] Since the components of the stapler are made of PC - ISO material, they have a certain elasticity. In this application, an arc boss 14 is provided at the starting end of the annular groove 13 at the top of the outer female ring 2; when the annular snap - type outer ring 3 and the outer female ring 2 start to rotate and fit, the arc boss 14 is compressed under pressure; when the annular snap - type outer ring 3 and the outer female ring 2 are completely fitted, since there is no longer external pressure, the arc boss 14 returns to its original state. Therefore, the arc boss 14 can prevent the sliding of the annular protrusion 7 of the annular snap - type outer ring and thus prevent the annular snap - type outer ring 3 from falling off.

[0042] The thread line 9 of the threaded outer ring 1 has a relatively small helix angle (this helix angle is 2 - 5 degrees); the helix angle realizes thread self - locking through the frictional force provided by the mutual extrusion during the operation of the components, so as to prevent the loosening and falling off between the threaded outer ring 1 and the outer female ring 2.

[0043] The present invention creatively adopts the collaborative design of a 15° conical surface angle and a small - helix - angle thread. Through biomechanical verification, within the range of an axial compression force of 12 - 18 N, it can not only ensure the critical pressure threshold (8.7 N / mm²) for the integrity of the blood vessel wall, but also maintain long - term stability through thread self - locking. Especially the cooperation of the three - segment asymmetric annular groove and the gradually changing curvature arc boss solves the problem of loosening caused by the insufficient elastic modulus of the degradable material. Through in - vitro porcine aortic tests, its anti - torsion performance reaches (3.2 ± 0.5) N·m, which is 22% higher than that of traditional metal staplers and there is no interference from imaging artifacts.

[0044] In order to prevent secondary injury caused by cutting the blood vessel wall, transition fillets 15 are provided on the surfaces of the stapler structure that come into contact with the blood vessel, that is, transition fillets are provided on the surfaces of the inner ring and the outer ring that come into contact with the blood vessel.

[0045] The usage steps of the present invention: Step 1: First, pass the two sections of blood vessels 5 through the inner walls of the annular snap - type outer ring 3 and the threaded outer ring 1 respectively; Step 2: Then take out two inner rings 4, thread two sections of blood vessels 5 along the inner walls of the inner rings 4 respectively, and turn the blood vessels outward to expose the inner walls of the blood vessels. At the same time, ensure that there is an extra part of the blood vessels on the first conical surface of the outer circle of the inner ring; Step 3: First, fit the annular snap-on outer ring 3 with the outer female ring 2, and at the same time ensure that the blood vessels 5 on the first conical surface of the outer circle of the inner ring are initially in contact with the second conical surface 8 of the inner circle of the annular snap-on outer ring 3; Step 4: Mate the thread 9 of the threaded outer ring 1 with the thread groove 12 of the outer female ring 2 and rotate the threaded outer ring 1. Stop when the blood vessels on the first conical surface of the outer circle of the inner ring 4 are in contact with the third conical surface 11 of the inner circle of the threaded outer ring 1. Then rotate the annular snap-on outer ring 3 and the threaded outer ring 1 simultaneously to ensure that the blood vessels on the two inner rings 4 are in close contact.

[0046] The present invention has the following advantages and effects compared with the prior art: 1. The present invention adopts a clamping mechanism of conical surfaces where the outer wall of the inner ring is parallel to the inner wall of the outer ring to firmly anastomose blood vessels. This innovative design completely abandons the blood vessel puncture step in traditional suture methods, thus effectively preventing the risk of blood vessel tearing that may be caused by stress concentration during the puncture process. At the same time, by achieving close contact between the inner walls of the blood vessels, the present invention greatly promotes the rapid healing and recovery process of blood vessel tissue. Further, the annular structures and threads on the outer ring and the outer female ring not only enhance the stability of the anastomosis but also significantly improve the convenience of operation for medical staff, making the surgical process smoother and saving a large amount of precious surgical time.

[0047] 2. The present invention sets arc-shaped protrusions in the annular groove of the outer female ring and designs a smaller thread angle at the other end of the outer female ring. This innovative design ensures a tight connection between the outer ring and the outer female ring and effectively prevents loosening, thus greatly reducing the risk of blood leakage during the surgical process. Compared with traditional puncture suture methods, its reliability has been significantly improved. In addition, the design of the inner ring fully considers the actual size of the blood vessels. Its inner diameter precisely matches the size of the blood vessels, and the surface is smooth without protrusions. Such a design minimizes the natural obstruction of the blood flow by the anastomosis device and effectively reduces the risk of thrombosis and blood vessel blockage caused by poor blood flow. Moreover, all corners of the present invention are treated with rounded transitions. This detailed design not only improves the overall aesthetics of the product but more importantly effectively prevents accidental injuries that may be caused by sharp corners to the human body, further enhancing the safety of the surgical process.

[0048] 3. The present invention is made of PC-ISO material, which has the property of naturally degrading in the human body with body fluids, thus eliminating the need for patients to undergo a second operation to remove the anastomosis device, greatly reducing the physical burden and inconvenience of patients.

[0049] The core of the present invention lies in achieving a gentle and effective extrusion of blood vessels through the mutual mechanical action among the outer ring, outer mother ring and inner ring, thereby promoting the tight and uniform fitting of the inner walls of the end portions of the two mutually approaching blood vessels, so as to achieve an efficient anastomosis effect. In this structure, the outer mother ring 2 controls and precisely adjusts the coaxiality between the two outer rings (the annular snap-type outer ring 3 and the threaded outer ring 1) through the provided annular groove and threaded groove, ensuring the axial stability of the entire stapler device. Also, through the ingenious protrusion design in its annular groove, a stable locking mechanism is provided for the annular snap-type outer ring. In addition, by adopting a small-angle thread design, the device can achieve fine adjustment and control while maintaining radial stability, further optimizing the accuracy and safety of blood vessel anastomosis.

[0050] Compared with the two comparative documents in the background art, the distinguishing feature 1 of the present application: the synergistic effect of the conical surface angle and thread self-locking. Comparative document CN113143370B: It uses a metal rigid conical surface (angle 25°) in cooperation with a buckle structure, having problems of image artifact interference and blood vessel stress concentration. Comparative document CN113474005B: Its biodegradable material stapler relies on elastic deformation for clamping and lacks an active locking mechanism. Innovation point of the present application: the combined design of a 15° conical surface angle + a 5° small helix angle thread, realizing the "progressive compression - self-locking maintenance" dual-stage effect on the biodegradable material (PC-ISO).

[0051] In summary, the aortic blood vessel stapler described in the present invention can quickly, reliably and safely achieve the anastomosis of the aorta, reduce the time required for suturing, improve the success rate of the operation, and reduce the pain of the patient.

[0052] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A threaded buckle aortic vascular anastomosis device, characterized in that: The aortic vascular anastomosis device comprises five components, namely an outer mother ring (2), two outer rings and two inner rings (4); the two inner rings (4) are of the same size and structure, and the ends of two sections of blood vessels close to each other are turned outward and sleeved on the inner rings (4); the two outer rings are respectively an annular snap-fit ​​outer ring (3) and a threaded outer ring (1); the two sections of blood vessels with turned outward are clamped between the inner walls of the annular snap-fit ​​outer ring (3), the threaded outer ring (1) and the outer walls of the inner rings (4); the inner wall of the outer mother ring (2) and the outer walls of the annular snap-fit ​​outer ring (3) and the threaded outer ring (1) are connected or clamped by threads, so that the ends of the two sections of blood vessels close to each other are closely fitted by the relative proximity of the annular snap-fit ​​outer ring (3) and the threaded outer ring (1).

2. The threaded snap-on aortic anastomosis device according to claim 1, characterized in that: The inner ring (4) is a tubular structure, the inner wall of the inner ring (4) is a cylindrical surface parallel to the central axis of the inner ring; the outer wall of the inner ring is a first conical surface (16) formed at an angle of 15° with the central axis of the inner ring; the first conical surface can cooperate with the inner wall of the outer ring to clamp and fix the blood vessel.

3. The threaded snap-on aortic anastomosis device according to claim 1 or 2, characterized in that: The annular snap-fit ​​outer ring (3) is a tubular structure, and the inner wall of the annular snap-fit ​​outer ring (3) is a second conical surface (8) formed at an angle of 15° with the central axis of the annular snap-fit ​​outer ring (3). The second conical surface (8) and the first conical surface (16) are used to fix the blood vessel everted on the inner ring in the anastomosis device by squeezing.

4. The threaded snap-on aortic anastomosis device according to claim 3, characterized in that: The threaded outer ring (1) is a tubular structure, and the inner wall of the threaded outer ring (1) is a third conical surface (11) formed at an angle of 15° with the central axis of the threaded outer ring (1). The third conical surface (11) and the first conical surface (16) are used to fix the blood vessel everted on the inner ring in the anastomosis device by squeezing.

5. The threaded snap-on aortic anastomosis device according to claim 4, characterized in that: The outer mother ring (2) is a thin-walled circular tube; the top of the inner wall of the outer mother ring (2) is provided with three sections of annular grooves (13), and a partial section of the annular grooves (13) extends to the top surface of the outer mother ring (2); the bottom of the outer wall of the annular snap-fit ​​outer ring (3) is provided with three sections of annular protrusions (7) that cooperate with the annular grooves (13) for snap-fitting and limiting; the top of the outer wall of the annular snap-fit ​​outer ring (3) is provided with a first regular hexagonal boss (6), and the first regular hexagonal boss (6) facilitates the rotation of the annular snap-fit ​​outer ring (3).

6. The threaded snap-on aortic anastomosis device according to claim 5, characterized in that: A thread groove (12) is provided at the bottom of the inner wall of the outer mother ring (2); a thread line (9) capable of being threadedly engaged with the thread groove (12) is provided at the bottom of the outer wall of the threaded outer ring (1); and a second hexagonal side boss (10) is provided at the top of the threaded outer ring (1), the second hexagonal side boss (10) facilitating the rotation of the threaded outer ring (1).

7. The threaded snap-on aortic anastomosis device according to claim 6, characterized in that: A circular arc boss (14) is provided at the starting end of the annular groove (13) at the top end of the outer female ring (2).

8. The threaded snap-on aortic anastomosis device according to claim 4, characterized in that: The thread line (9) of the threaded outer ring (1) is provided with a helix angle of 2-5 degrees, so that the threaded outer ring (1) and the outer mother ring (2) are rubbed against each other to achieve thread self-locking, thereby preventing the threaded outer ring (1) and the outer mother ring (2) from loosening and falling off.

9. The threaded snap-on aortic anastomosis device according to claim 2, characterized in that: The surfaces of the inner ring and the outer ring that are in contact with the blood vessel are provided with transition fillets to prevent cutting of the blood vessel wall and causing secondary damage.

10. A method for using the threaded snap-on aortic anastomosis device according to any one of claims 1 to 9, characterized in that: Step 1: First, two sections of blood vessels (5) are passed through the inner walls of the annular buckle-type outer ring (3) and the threaded outer ring (1) respectively; Step 2: Take out the two inner rings (4), pass the two sections of blood vessels (5) along the inner wall of the inner rings (4), and turn the blood vessels outside to expose the inner wall of the blood vessels, while ensuring that the excess part of the blood vessels is on the first cone surface of the outer circle of the inner rings; Step 3, firstly mate the annular snap-fit ​​outer ring (3) with the outer mother ring (2), while ensuring that the blood vessel (5) on the first conical surface of the outer ring of the inner ring is initially fitted with the second conical surface (8) of the inner ring of the annular snap-fit ​​outer ring (3); Step 4: match the thread line (9) of the threaded outer ring (1) with the thread groove (12) of the outer female ring (2) and rotate the threaded outer ring (1). When the blood vessel on the first conical surface of the outer ring of the inner ring (4) fits with the third conical surface (11) of the inner ring of the threaded outer ring (1), the rotation can be stopped. Then, the annular snap-on outer ring (3) and the threaded outer ring (1) are rotated simultaneously to ensure that the blood vessels on the two inner rings (4) can fit tightly.

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