Threaded buckle type aorta blood vessel anastomat

Abstract

The utility model relates to a thread buckle type aorta blood vessel anastomat which 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 and preventing 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

[0001] This utility model relates to the field of medical devices, specifically to a medical device for rapid aortic anastomosis, namely a threaded snap-fit ​​aortic anastomosis device. Background Technology

[0002] As an indispensable core component of the circulatory system, blood vessels play a crucial role in the treatment of cardiovascular diseases through precise anastomosis. Although traditional suture techniques are widely used due to their economy and certain applicability, their high complexity, long operation time, and tendency to cause vascular wall damage and poor biocompatibility issues have become key factors limiting surgical outcomes and recovery speed. Therefore, the development of novel vascular anastomosis techniques focuses on achieving rapid and high-quality anastomosis, aiming to fundamentally reduce surgical trauma and improve patient prognosis. The core of this innovation lies in simplifying the operational process, lowering the technical threshold, and ensuring optimal levels of anastomosis accuracy, stability, and biocompatibility. In other words, while maximizing time efficiency, it ensures flawless vascular anastomosis quality, thereby achieving both rapid surgery and guaranteeing the safety and effectiveness of treatment, minimizing potential harm to the body.

[0003] Currently, the field of vascular anastomosis has witnessed numerous technological innovations, giving rise to diverse innovative technologies such as mechanical closure devices, bio-adhesive bonding, and laser and high-frequency electrocoagulation thermal welding. These advancements have greatly accelerated the surgical process and simplified operational complexity. However, each technology comes with its inherent challenges and potential risks: for example, while bio-adhesives simplify suture procedures and reduce the risk of complications, their long-term biocompatibility and stability are still being validated; while thermal welding technology, though novel and efficient, requires careful control to avoid unnecessary thermal damage to the vessel wall; mechanical closure devices typically use metal as the material, which prevents patients from undergoing medical examinations such as MRI and CT scans while wearing the anastomosis device, potentially impacting postoperative recovery assessments. In contrast, biodegradable mechanical closure anastomoses made of polymers can eliminate the drawbacks of the above anastomosis methods, reducing the inconvenience and impact of vascular anastomosis on patients.

[0004] Against this backdrop, precision mechanically designed vascular anastomosis devices have stood out among numerous technologies due to their significant advantages of speed, safety, reliability, and ease of operation, becoming a strong candidate to overcome the limitations of existing technologies.

[0005] Currently, a Chinese patent, "A Vascular Anastomosis Device," with publication number CN113143370B, has been found. This vascular anastomosis device includes an anastomosis ring and multiple anastomosis bolts. The anastomosis ring has an axial inner cavity in its center. One end of the graft vessel passes through the inner cavity and is everted onto the front face of the anastomosis ring. Multiple axial through holes are provided on the outer periphery of the inner cavity of the anastomosis ring, with one through hole corresponding to one anastomosis bolt. The anastomosis bolt passes sequentially through the through holes, the graft vessel, and the aorta, fixing the graft vessel and the aorta together. The vascular anastomosis device provided by this invention has a simple structure, is easy to operate, and provides good vascular anastomosis results. In application, it can minimize the time and complications associated with vascular anastomosis. This vascular anastomosis device can achieve the installation of the graft vessel by setting the anastomosis ring, and can achieve the anastomosis of the graft vessel and the aorta by setting the anastomosis bolts; however, it cannot achieve the tandem connection of the two vessel ends.

[0006] Additionally, a Chinese patent, CN113749709B, entitled "A Vascular Anastomosis Device," was found. This device includes a left pusher, a right pusher, and a central unit for connecting two segments of a blood vessel. The central unit includes a sliding section in the middle and docking sections at both ends that connect with the blood vessel. The central unit is circumferentially spaced with several sets of needle insertion sections, each set including a left needle insertion section and a right needle insertion section. Both the left and right needle insertion sections are equipped with suture needles, and the two corresponding suture needles in each set are connected by the same suture thread. The left and right pushers are slidably sleeved on the central unit. The sliding part, the left pusher and the right pusher are respectively provided with pusher parts to push the suture needle out from the docking part. Compared with the traditional vascular anastomosis device, this vascular anastomosis device ensures the uniformity of the docking at both ends, reduces the corresponding operation steps, and reduces the patient's pain. The left pusher and the right pusher can simultaneously pass the suture needle through the blood vessels at both ends under the action of external force to realize the suture operation. The operation is simple and the docking efficiency and accuracy are high. Although this vascular anastomosis device realizes the connection of the ends of two blood vessels, it still uses suture to suture, and the suturing efficiency is still relatively low. Summary of the Invention

[0007] In view of the problems existing in the existing anastomosis devices, the purpose of this utility model is to provide a threaded snap-fit ​​aortic anastomosis device, which can be used for the rapid connection of the ends of two aortic vessels.

[0008] To achieve the above objectives, the technical solution of this utility model is as follows:

[0009] This utility model relates to a threaded snap-fit ​​aortic anastomosis device, characterized in that: the aortic anastomosis device comprises five components, namely an outer mother ring, two outer rings, and two inner rings; the two inner rings are identical in size and structure, with the ends of the two blood vessels close to each other turned outwards and fitted onto the inner rings; the two outer rings are a ring-shaped snap-fit ​​outer ring and a threaded outer ring, respectively, with the two blood vessels with their ends turned outwards being clamped between the inner walls of the ring-shaped snap-fit ​​outer ring and the threaded outer ring and the outer walls of the inner rings, respectively; the inner wall of the outer mother ring is connected to or snapped onto the outer walls of the ring-shaped snap-fit ​​outer ring and the threaded outer ring by threads, so that the close proximity of the ring-shaped snap-fit ​​outer ring and the threaded outer ring achieves a tight fit between the ends of the two blood vessels close to each other.

[0010] Furthermore, the aforementioned inner ring is 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 a 15° angle to 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.

[0011] Furthermore, the aforementioned annular snap-fit ​​outer ring is a tubular structure, and the inner wall of the annular snap-fit ​​outer ring is a second conical surface formed at a 15° angle with the central axis of the annular snap-fit ​​outer ring. The second conical surface and the first conical surface are squeezed to fix the blood vessel that is everted and fitted onto the inner ring in the anastomosis device.

[0012] Furthermore, the aforementioned threaded outer ring is a tubular structure, and the inner wall of the threaded outer ring is a third conical surface formed at a 15° angle with the central axis of the threaded outer ring. This third conical surface and the first conical surface are squeezed to fix the blood vessel that is everted and fitted onto the inner ring in the anastomosis device.

[0013] Furthermore, the aforementioned outer ring is a thin-walled circular tube; the top of the inner wall of the outer ring has three annular grooves, a portion of which extends to the top surface of the outer ring; the bottom of the outer wall of the annular snap-fit ​​outer ring has three annular protrusions that engage with the annular grooves for snap-fit ​​and positioning; the top of the outer wall of the annular snap-fit ​​outer ring has a first regular hexagonal boss, which facilitates the rotation of the annular snap-fit ​​outer ring.

[0014] Furthermore, the bottom of the inner wall of the outer ring is provided with a threaded groove; the bottom of the outer wall of the threaded outer ring is provided with a threaded line that can be screwed into the threaded groove; the top of the threaded outer ring is provided with a second hexagonal boss, which facilitates the rotation of the threaded outer ring.

[0015] Furthermore, the starting end of the annular groove at the top of the outer ring is provided with an arc-shaped boss.

[0016] Furthermore, the threaded outer ring has a helix angle of 2-5 degrees; this allows for thread self-locking through mutual friction and squeezing between the threaded outer ring and the outer female ring, preventing loosening and detachment between the threaded outer ring and the outer female ring.

[0017] Furthermore, the inner and outer rings mentioned above have rounded corners on the surfaces that come into contact with blood vessels to prevent secondary damage caused by cutting the blood vessel walls.

[0018] The method of using the threaded snap-fit ​​aortic anastomosis device of this utility model.

[0019] Step 1: Pass the two blood vessels through the inner walls of the ring-shaped snap-fit ​​outer ring and the threaded outer ring, respectively.

[0020] Step two, remove the two inner rings, pass the two blood vessels through the inner wall of the inner rings respectively, and turn the blood vessels outward to expose the inner wall of the blood vessels. At the same time, ensure that there is an excess part of the blood vessels on the first cone surface of the outer ring of the inner ring.

[0021] Step 3: First, fit the outer ring with the outer ring, while ensuring that the blood vessels on the first conical surface of the outer ring of the inner ring are initially attached to the second conical surface of the inner ring of the outer ring.

[0022] Step four: align the threaded outer ring with the threaded groove of the outer mother ring and rotate the threaded outer ring. Stop when the blood vessel on the first conical surface of the outer ring of the inner ring is in contact with the third conical surface of the inner ring of the threaded outer ring. Then, simultaneously rotate the annular snap-fit ​​outer ring and the threaded outer ring to ensure that the blood vessels on the two inner rings are tightly in contact.

[0023] This invention features a mating annular structure or thread at the connection between the two outer rings and the outer mother ring. The outer wall of the inner ring and the inner walls of the two outer rings are designed with parallel conical surfaces to clamp the blood vessel, and the outer rings and the outer mother ring achieve axial fixation of the anastomosis device. The annular groove of the outer mother ring has an arc-shaped boss, which provides circumferential fixation of the annular snap-fit ​​outer ring to prevent loosening and detachment. The outer mother ring achieves self-locking with the threaded outer ring by setting a small thread angle, completing circumferential positioning. This aortic anastomosis device can be used in clinical surgeries for most cardiovascular diseases, significantly reducing anastomosis time and lowering the risk of secondary infection for patients.

[0024] This utility model has the following advantages and effects compared with the prior art:

[0025] 1. This invention employs a clamping mechanism using conical surfaces parallel to the outer wall of the inner ring and the inner wall of the outer ring to stabilize the blood vessel during anastomosis. This innovative design completely eliminates the vascular puncture step in traditional suturing methods, effectively preventing the risk of vascular tearing caused by stress concentration during puncture. Simultaneously, by achieving a tight fit between the inner walls of the blood vessel, this invention greatly promotes the rapid healing and recovery of vascular tissue. Furthermore, the annular structure and threads on the outer ring and the outer mother ring not only enhance the stability of the anastomosis but also significantly improve the ease of operation for medical staff, making the surgical process smoother and saving valuable surgical time. Since cardiac-related clinical surgeries often require large vessel anastomosis, and cardiac surgeries generally establish an extracorporeal circulation support system and temporarily deprive the heart of pumping blood, shortening the vascular anastomosis time is highly beneficial to patients.

[0026] 2. This invention features an arc-shaped protrusion within the annular groove of the outer female ring and a small thread angle at the other end of the outer female ring. This innovative design ensures a tight and seamless connection between the outer ring and the outer female ring, effectively preventing loosening and significantly reducing the risk of blood leakage during surgery. Compared to traditional puncture and suturing methods, its reliability is significantly improved. Furthermore, the inner ring design fully considers the actual size of the blood vessel, with its inner diameter precisely matching the vessel size and a smooth, unobstructed surface. This design minimizes the natural obstruction of blood flow by the stapler, effectively reducing the risk of thrombosis and vascular blockage caused by poor blood flow. Moreover, all corners of this invention are rounded, a detail that not only enhances the overall aesthetics of the product but, more importantly, effectively prevents accidental injury from sharp edges, further enhancing the safety of the surgical procedure.

[0027] 3. This invention is made of PC-ISO material, which has the characteristic of naturally degrading within the human body with bodily fluids. Currently available staplers are typically made of non-degradable materials, which narrows the diameter of the blood vessel connections, making thrombosis more likely due to differences in blood vessel diameter. Staplers made of biodegradable materials, however, slowly decompose with bodily fluids, ensuring consistent blood vessel diameters and eliminating postoperative complications.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the assembly of this utility model;

[0030] Figure 2 This is a cross-sectional schematic diagram of the assembly of this utility model;

[0031] Figure 3 This is a three-dimensional schematic diagram of the annular snap-fit ​​outer ring of this utility model;

[0032] Figure 4 This is a schematic cross-sectional view of the annular snap-fit ​​outer ring of this utility model;

[0033] Figure 5 This is a three-dimensional schematic diagram of the threaded outer ring of this utility model;

[0034] Figure 6 This is a schematic cross-sectional view of the threaded outer ring of this utility model;

[0035] Figure 7 This is a three-dimensional schematic diagram of the outer mother ring of this utility model;

[0036] Figure 8 This is a schematic diagram of the arc-shaped boss on the outer ring of this utility model;

[0037] Figure 9 This is a perspective view of the function of the outer ring arc boss of this utility model;

[0038] Figure 10 This is a three-dimensional schematic diagram of the inner ring of this utility model;

[0039] Figure 11 This is a schematic cross-sectional view of the inner ring of this utility model;

[0040] Figure 12 This is a schematic diagram of the first assembly step of the stapler of this utility model;

[0041] Figure 13 This is a schematic diagram of the second assembly step of the stapler of this utility model;

[0042] Figure 14 This is a schematic diagram of the third step in assembling the stapler of this utility model;

[0043] Figure 15 This is a stress simulation diagram of the blood vessel compression deformation reaching 20% ​​according to this utility model.

[0044] Figure 16 This is a simulation diagram of the stress on a blood vessel when the axial displacement of the stapler of this utility model is 1 mm;

[0045] In the picture:

[0046] 1-Threaded outer ring, 2-Outer female ring, 3-Annular snap-fit ​​outer ring, 4-Inner ring, 5-Vessel, 6-First regular hexagonal boss, 7-Annular protrusion, 8-Second conical surface, 9-Thread, 10-Second regular hexagonal boss, 11-Third conical surface, 12-Thread groove, 13-Annular groove, 14-Circular arc boss, 15-Transition fillet, 16-First conical surface. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0048] This utility model relates to a threaded snap-fit ​​aortic anastomosis device, which is used for vascular suturing in cardiovascular clinical surgery. The aortic anastomosis device has five components: an outer mother ring 2, two outer rings, and two inner rings 4. The two inner rings 4 are identical in size and structure, and the end of the blood vessel 5 can be everted and fitted onto the inner ring 4. The two outer rings have slightly different structures, so the outer rings are divided into annular snap-fit ​​outer rings 3 and threaded outer rings 1. The blood vessel 5 is clamped and fixed between the inner ring 4 and the annular snap-fit ​​outer ring 3 or the threaded outer ring 1 through the structural design between the annular snap-fit ​​outer ring 3 and the threaded outer ring 1 and the inner ring 4, respectively.

[0049] Two blood vessel segments, with their ends close to each other, are everted and fitted onto the inner ring 4. The two everted segments are respectively clamped between the inner walls of the annular snap-fit ​​outer ring 3 and the threaded outer ring 1, and the outer wall of the inner ring 4. The inner wall of the outer ring 2 is connected or snapped to the outer walls of the annular snap-fit ​​outer ring 3 and the threaded outer ring 1 via threads (in one embodiment, the inner wall of the outer ring 2 is threaded, and the outer walls of the annular snap-fit ​​outer ring 3 and the threaded outer ring 1 are correspondingly threaded; the annular snap-fit ​​outer ring 3 is rotated relative to the threaded connection of the outer ring 2 by the annular snap-fit ​​outer ring 3 and the threaded outer ring 1). In another embodiment, the inner wall of the outer ring 2 is provided with a wedge-shaped buckle, and the outer walls of the annular buckle-type outer ring 3 and the threaded outer ring 1 are respectively provided with buckles that can engage with the wedge-shaped buckles. By connecting the annular buckle-type outer ring 3 and the threaded outer ring 1 with the outer ring 2, the annular buckle-type outer ring 3 and the threaded outer ring 1 are brought closer together (the specific embodiments of this application will be described in detail later). Thus, the outer ring 2 drives the annular buckle-type outer ring 3 and the threaded outer ring 1 to bring them closer together, so that the ends of the two blood vessels that are close to each other are tightly fitted.

[0050] The five components of this aortic anastomosis device are all designed based on cylinders (i.e., tubes) with through holes. The purpose is to keep the shape of the blood vessel 5 consistent and to facilitate the installation of the anastomosis device in a confined space.

[0051] 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 15° angle with the central axis of the inner ring to form a first conical surface 16 (i.e., a taper of 15 degrees); the function of the first conical surface is to form a clamping fit with the inner wall of the outer ring (including the annular snap-fit ​​outer ring 3 and the threaded outer ring 1) to fix the blood vessel 5.

[0052] Specifically, the annular snap-fit ​​outer ring 3 is a tubular structure. The inner wall of the annular snap-fit ​​outer ring 3 forms a 15° angle with the central axis of the annular snap-fit ​​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 the second conical surface 8 is to fix the blood vessel 5 in the anastomosis device by squeezing the blood vessel 5 fitted on the inner ring 4 with the second conical surface 8.

[0053] The inner wall of the threaded outer ring 1 is provided with a similar third conical surface 11. This third conical surface 11 has the same function as the second conical surface 8 on the inner wall of the annular snap-fit ​​outer ring 3. Specifically, the threaded outer ring 1 is a tubular structure. The inner wall of the threaded outer ring 1 is a third conical surface 11 formed at a 15° angle with the central axis of the threaded outer ring 1. This third conical surface 11 and the first conical surface 16 are squeezed to fix the blood vessel that is everted and fitted on the inner ring in the anastomosis device.

[0054] 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.

[0055] After assembly, as shown Figure 2 As shown, the first conical surface 16 of the outer wall of the inner ring 4 is slightly smaller than the second conical surface 8 and the third conical surface 11 of the inner wall of the annular snap-fit ​​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 are slightly smaller than the thickness of the blood vessel 5, so as to prevent the blood vessel from loosening and causing blood leakage when clamping the blood vessel wall.

[0056] The outer ring 2 is a thin-walled cylinder (i.e., a thin-walled cylindrical tube); the top of the inner wall of the outer ring 2 (i.e., the...) Figure 7 The left side (as shown) has three annular grooves 13; a portion of the annular groove 13 extends to the top surface of the outer ring 2 (i.e., the left side). Figure 7 The left end face shown), the bottom of the inner wall of the outer mother ring 2 (i.e., the ...). Figure 7 The right side shown has a threaded groove 12; the design of the three annular grooves 13 and threaded grooves 12 in the inner wall of the outer female ring 2 is to facilitate the cooperation between the annular snap-fit ​​outer ring 3, the threaded outer ring 1 and the outer female ring 2.

[0057] The bottom of the outer wall of the annular snap-fit ​​outer ring 3 is provided with three annular protrusions 7 that cooperate with the annular groove 13 for snap-fit ​​and positioning. The annular protrusions 7 have the same inclination angle as the annular groove 13 of the outer ring. The total length of the annular groove 13 should be at least twice the length of the annular protrusions 7. The length of the local section of the annular groove 13 extending to the top surface of the outer ring 2 should also be at least equal to the length of the annular protrusions 7. The top of the outer wall of the annular snap-fit ​​outer ring is provided with a first regular hexagonal boss 6, which is used to facilitate the rotation of the annular snap-fit ​​outer ring 3.

[0058] When assembling the annular snap-fit ​​outer ring 3 and the outer female ring 2, the annular protrusion 7 is first aligned with the local section of the annular groove 13 extending to the top surface of the outer female ring 2 and then inserted. After rotating the two at a certain angle (such as the circumferential angle of the annular protrusion 7), the assembly and positioning of the two are achieved.

[0059] The bottom of the outer wall of the threaded outer ring 1 is provided with a threaded wire 9 that can be screwed into the threaded groove 12. The threaded wire 9 can form a rotational engagement with the threaded groove 12 at the bottom of the outer female ring 2. The top of the threaded outer ring 1 is provided with a second hexagonal protrusion 10, which has the same function as the first regular hexagonal protrusion 6 of the annular snap-fit ​​outer ring 3, and also makes the operation of the stapler more convenient.

[0060] Since the components of the stapler are made of PC-ISO material, they have a certain degree of elasticity. In this application, an arc-shaped 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-fit ​​outer ring 3 and the outer female ring 2 begin to rotate and engage, the arc-shaped boss 14 is compressed by pressure. When the annular snap-fit ​​outer ring 3 and the outer female ring 2 are engaged, the arc-shaped boss 14 returns to its original shape because it is no longer under external pressure. Therefore, the arc-shaped boss 14 can prevent the annular protrusion 7 of the annular snap-fit ​​outer ring from sliding, thereby preventing the annular snap-fit ​​outer ring 3 from falling off.

[0061] The threaded outer ring 1 has a small helix angle (2-5 degrees) on its threaded line 9. The helix angle achieves thread self-locking through the friction provided by the mutual compression of the components during operation, thereby preventing the threaded outer ring 1 from loosening and falling off from the outer female ring 2.

[0062] This invention creatively employs a synergistic design of a 15° conical angle and a small helical angle thread. Biomechanical verification has shown that within an axial clamping force range of 12-18N, it can maintain the critical pressure threshold (8.7N / mm²) for vascular wall integrity while also ensuring long-term stability through thread self-locking. In particular, the combination of the three-segment asymmetric annular groove and the gradually curvature arc boss solves the problem of loosening caused by insufficient elastic modulus of biodegradable materials. In isolated porcine aortic testing, its torsional resistance reaches (3.2±0.5) N·m, a 22% improvement over traditional metal staplers without any imaging artifacts.

[0063] To prevent secondary damage caused by cutting the blood vessel wall, the stapler structure has a transition rounded corner 15 on the surfaces that come into contact with the blood vessel. That is, the inner and outer rings have transition rounded corners on the surfaces that come into contact with the blood vessel.

[0064] The steps for using this utility model are as follows:

[0065] Step 1: First, pass the two blood vessels 5 through the inner walls of the annular snap-fit ​​outer ring 3 and the threaded outer ring 1, respectively.

[0066] Step 2: Remove the two inner rings 4, pass the two blood vessels 5 through the inner wall of the inner ring 4 respectively, and turn the blood vessels outward to expose the inner wall of the blood vessels. At the same time, ensure that there is an excess part of the blood vessels on the first cone surface of the outer ring of the inner ring.

[0067] Step 3: First, mate the outer ring 3 with the outer ring 2, while ensuring that the blood vessels 5 on the first conical surface of the outer ring of the inner ring are initially attached to the second conical surface 8 of the inner ring of the outer ring 3.

[0068] Step 4: Connect the thread 9 of the threaded outer ring 1 with the threaded groove 12 of the outer mother ring 2 and rotate the threaded outer ring 1. Stop when the blood vessel on the first conical surface of the outer ring 4 is in contact with the third conical surface 11 of the inner ring 1. Then rotate the annular snap-fit ​​outer ring 3 and the threaded outer ring 1 at the same time to ensure that the blood vessels on the two inner rings 4 can be tightly attached.

[0069] This utility model has the following advantages and effects compared with the prior art:

[0070] 1. This invention employs a clamping mechanism using conical surfaces parallel to the outer wall of the inner ring and the inner wall of the outer ring to stabilize the blood vessel during anastomosis. This innovative design completely eliminates the vascular puncture step in traditional suturing methods, effectively preventing the risk of vascular tearing caused by stress concentration during puncture. Simultaneously, by achieving a tight fit between the inner walls of the blood vessel, this invention greatly promotes the rapid healing and recovery of vascular tissue. Furthermore, the annular structure and threads on the outer ring and the outer mother ring not only enhance the stability of the anastomosis but also significantly improve the ease of operation for medical personnel, making the surgical process smoother and greatly saving valuable surgical time.

[0071] 2. This invention features an arc-shaped protrusion within the annular groove of the outer female ring and a small thread angle at the other end of the outer female ring. This innovative design ensures a tight and seamless connection between the outer ring and the outer female ring, effectively preventing loosening and significantly reducing the risk of blood leakage during surgery. Compared to traditional puncture and suturing methods, its reliability is significantly improved. Furthermore, the inner ring design fully considers the actual size of the blood vessel, with its inner diameter precisely matching the vessel size and a smooth, unobstructed surface. This design minimizes the natural obstruction of blood flow by the stapler, effectively reducing the risk of thrombosis and vascular blockage caused by poor blood flow. Moreover, all corners of this invention are rounded, a detail that not only enhances the overall aesthetics of the product but, more importantly, effectively prevents accidental injury from sharp edges, further enhancing the safety of the surgical procedure.

[0072] 3. This utility model is made of PC-ISO material, which has the characteristic of being naturally degraded in the human body with body fluids, thus eliminating the need for patients to undergo a second surgery to remove the stapler, greatly reducing the physical burden and inconvenience on patients.

[0073] The core of this invention lies in achieving gentle yet effective compression of blood vessels through the mutual mechanical interaction between the outer ring, the outer mother ring, and the inner ring. This promotes a tight and uniform fit between the inner walls of the two blood vessels at their closest points, resulting in a highly efficient anastomosis. In this structure, the outer mother ring 2 controls and precisely adjusts the coaxiality between the two outer rings (the annular snap-fit ​​outer ring 3 and the threaded outer ring 1) through its annular groove and threaded groove, ensuring the axial stability of the entire anastomosis device. Furthermore, the ingenious protrusion design within its annular groove provides a secure locking mechanism for the annular snap-fit ​​outer ring. In addition, the use of a small-angle thread design allows the device to maintain radial stability while achieving fine adjustment and control, further optimizing the precision and safety of vascular anastomosis.

[0074] Compared to the two prior art documents, the distinguishing feature of this application is the synergistic effect of the conical angle and the self-locking thread. Prior art document CN113143370B uses a rigid metal conical surface (25° angle) with a locking structure, which results in image artifact interference and vascular stress concentration problems.

[0075] Reference document CN113474005B: Its biodegradable material stapler relies on elastic deformation clamping and lacks an active locking mechanism; the innovation of this application is: the combination design of 15° conical angle + 5° small helix angle thread, which realizes the dual-stage function of "progressive compression - self-locking maintenance" on biodegradable material (PC-ISO).

[0076] In summary, the aortic anastomosis device described in this utility model can quickly, reliably, and safely achieve aortic anastomosis, reduce the time required for suturing, improve the success rate of surgery, and reduce patient suffering.

[0077] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A threaded snap-fit ​​aortic anastomosis device, characterized in that: The aortic anastomosis device comprises five components: an outer mother ring (2), two outer rings, and two inner rings (4). The two inner rings (4) are identical in size and structure, with the ends of the two blood vessels close to each other being turned outwards and fitted onto the inner rings (4). The two outer rings are a ring-type snap-fit ​​outer ring (3) and a threaded outer ring (1). The two blood vessels with their ends turned outwards are clamped between the inner walls of the ring-type snap-fit ​​outer ring (3) and the threaded outer ring (1) and the outer walls of the inner rings (4), respectively. The inner wall of the outer mother ring (2) is connected to or snapped with the outer walls of the ring-type snap-fit ​​outer ring (3) and the threaded outer ring (1) by threads, so that the two blood vessels are tightly fitted at the ends of the two blood vessels close to each other by the relative proximity of the ring-type snap-fit ​​outer ring (3) and the threaded outer ring (1).

2. The threaded snap-fit ​​aortic anastomosis device according to claim 1, characterized in that: The inner ring (4) is a tubular structure, and 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 a 15° angle to 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-fit ​​aortic anastomosis device according to claim 2, characterized in that: The annular snap-on outer ring (3) is a tubular structure. The inner wall of the annular snap-on outer ring (3) is a second conical surface (8) formed at a 15° angle with the central axis of the annular snap-on outer ring (3). The second conical surface (8) and the first conical surface (16) are squeezed to fix the blood vessels that are everted and fitted on the inner ring in the anastomosis device.

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

5. The threaded snap-fit ​​aortic anastomosis device according to claim 4, characterized in that: The outer ring (2) is a thin-walled circular tube; the top of the inner wall of the outer ring (2) has three annular grooves (13), and a portion of the annular grooves (13) extends to the top surface of the outer ring (2). The bottom of the outer wall of the annular snap-fit ​​outer ring (3) is provided with three annular protrusions (7) that cooperate with the annular grooves (13) for snap-fit ​​and positioning.

6. The threaded snap-fit ​​aortic anastomosis device according to claim 5, characterized in that: The bottom of the inner wall of the outer ring (2) is provided with a threaded groove (12); the bottom of the outer wall of the threaded outer ring (1) is provided with a threaded line (9) that can be screwed into the threaded groove (12).

7. The threaded snap-fit ​​aortic anastomosis device according to claim 6, characterized in that: The top of the outer wall of the annular snap-fit ​​outer ring (3) is provided with a first regular hexagonal boss (6), which facilitates the rotation of the annular snap-fit ​​outer ring (3); the top of the threaded outer ring (1) is provided with a second hexagonal side boss (10), which facilitates the rotation of the threaded outer ring (1).

8. The threaded snap-fit ​​aortic anastomosis device according to claim 7, characterized in that: The annular groove (13) at the top of the outer ring (2) is provided with an arc-shaped boss (14).

9. The threaded snap-fit ​​aortic anastomosis device according to claim 4, characterized in that: The threaded outer ring (1) has a helix angle of 2-5 degrees on the thread line (9); so that the threaded outer ring (1) and the outer female ring (2) can be self-locked by mutual friction and squeezing, and prevent the threaded outer ring (1) and the outer female ring (2) from loosening and falling off.

10. The threaded snap-fit ​​aortic anastomosis device according to claim 2, characterized in that: Both the inner and outer rings have rounded corners on the surfaces that come into contact with blood vessels to prevent secondary damage caused by cutting the blood vessel walls.

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