Vascular anastomosis device

Abstract

The application relates to a blood vessel anastomosis device, which comprises a first support and a connecting piece. The first support is provided with a first opening penetrating the inner and outer walls of the first support, and the first opening is used for being opposite to a first fistula position on a first blood vessel. The connecting piece comprises a pipe part and a first clamping part connected to one end of the pipe part. The connecting piece is provided with a blood flow channel penetrating the pipe part and the first clamping part along the axial direction of the pipe part. The pipe part is arranged in the first opening, and the first clamping part is arranged on the inner wall side of the first support and matched with the inner wall of the first support, so as to seal and clamp the blood vessel wall around the first fistula on the first blood vessel. The blood vessel anastomosis device saves the operation time, improves the operation efficiency, and improves the operation safety and postoperative recovery effect.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a vascular anastomosis device. Background Technology

[0002] Hemodialysis is one of the main renal replacement therapies for patients with kidney failure, and establishing an effective vascular access is a prerequisite for the smooth progress of hemodialysis. Clinically, autogenous arteriovenous fistula (AVF) or vascular graft fistula (AVG) access is usually used to provide the blood access required for dialysis in hemodialysis patients.

[0003] In AVF (arteriovenous vascular endothelial fusion) surgery, surgeons typically anastomose an artery and a vein, manually suturing the anastomosis to create a blood flow pathway. However, manual suturing demands a high level of skill from the surgeon, and the results vary between surgeons. Surgeons proficient in suturing small-sized vessels require at least 3 to 5 years of practical training and experience. Even highly experienced surgeons can make suturing errors, which can directly lead to complications such as vascular damage and infection, directly impacting long-term vascular patency. Furthermore, manual suturing is time-consuming, prolonging the surgery, increasing the patient's risk of infection, and significantly consuming the surgeon's time and energy. Additionally, the irritation from the suture needle inevitably causes damage to the vascular endothelium, potentially leading to intraoperative vasospasm or even intravascular thrombosis. Summary of the Invention

[0004] Therefore, it is necessary to provide a vascular anastomosis device to address the issue of how to more conveniently and safely create blood flow pathways.

[0005] This application provides a vascular anastomosis device, comprising:

[0006] A first support member, the first support member having a first opening penetrating its inner and outer walls, the first opening being positioned opposite to a first fistula opening on a first blood vessel; and...

[0007] The connector includes a tube and a first engaging portion connected to one end of the tube. The connector has a blood flow channel passing through the tube and the first engaging portion along the axial direction of the tube. The tube passes through the first opening. The first engaging portion is disposed on the inner wall side of the first support member. The first engaging portion cooperates with the inner wall of the first support member to seal and clamp the blood vessel wall around the first fistula on the first blood vessel.

[0008] The technical solution will be further explained below:

[0009] In one embodiment, the inner wall of the first support member is provided with a receiving groove, the receiving groove is in communication with the first opening, and the first engaging part is disposed in the receiving groove and cooperates with the groove wall of the receiving groove.

[0010] In one embodiment, the groove wall of the receiving groove and one of the first engaging portions are provided with a latching protrusion, and the other is provided with a latching groove adapted to the latching protrusion, wherein the latching protrusion and the latching groove engage in a latching fit.

[0011] In one embodiment, the first support member is a first sleeve, and the first support member has an inlet on the side opposite to the first opening. The inlet passes through both ends of the first support member in the axial direction and communicates with the inner cavity of the first support member.

[0012] In one embodiment, the edge of the inlet has a serrated or wavy structure in a plane perpendicular to the axis of the first support member; or, the edge of the inlet has a serrated or wavy structure in a plane parallel to the axis of the first support member.

[0013] In one embodiment, the first support member has a clearance opening that communicates with the inlet, and the position of the clearance opening corresponds to the position of the first opening in the circumferential direction of the first support member.

[0014] In one embodiment, both the inner wall of the tube and the first engaging portion are provided with a biocompatible protective layer; and / or,

[0015] The outer wall of the first support member and the outer wall of the tube are both covered with a biocompatible protective sleeve.

[0016] In one embodiment, the angle between the central axis of the tube and the central axis of the first blood vessel ranges from 40° to 60°.

[0017] In one embodiment, the vascular anastomosis device further includes a latching member that is nested and engaged with the other end of the tube. The latching member has a through hole communicating with the blood flow channel. The latching member engages with the tube to seal and clamp the vessel wall at the end of the second blood vessel.

[0018] In one embodiment, one of the fastener and the tube is provided with a boss, and the other is provided with a groove adapted to the boss, the boss being disposed in the groove.

[0019] In one embodiment, the vascular anastomosis device further includes a second support member, the second support member having a second opening penetrating its inner and outer walls, the second opening being positioned opposite to a second fistula on the second blood vessel, the connector further including a second engaging portion connected to the end of the tube portion opposite to the first engaging portion, the tube portion also passing through the second opening, the second engaging portion being disposed on the inner wall side of the second support member, the second engaging portion cooperating with the inner wall of the second support member to seal and clamp the blood vessel wall around the second fistula on the second blood vessel.

[0020] In the aforementioned vascular anastomosis device, by placing the first support member on the first blood vessel and aligning the first opening of the first support member with the first fistula on the first blood vessel, and simultaneously placing the first engaging portion of the connector into the first blood vessel through the first fistula, and then engaging the first engaging portion with the inner wall of the first support member, the first engaging portion and the inner wall of the first support member can clamp the blood vessel wall around the first fistula on the first blood vessel from both the inner and outer sides of the first blood vessel, thereby sealing the edge of the first fistula and connecting the blood flow channel of the connector with the first fistula. By connecting the other end of the connector to the second blood vessel, a blood flow path connecting the first and second blood vessels can be established. Compared with the traditional method that requires suturing the first and second blood vessels, the vascular anastomosis device of this application does not require suturing the first and second blood vessels, making the operation simpler, reducing the requirement for the surgeon's experience, greatly saving surgical time, improving surgical efficiency, and reducing the probability of vascular intimal damage, intraoperative vasospasm, and thrombosis caused by suturing, thus improving surgical safety and postoperative recovery. Attached Figure Description

[0021] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the various components are shown as examples only and not necessarily to scale. In the accompanying drawings:

[0024] Figure 1 This is a schematic diagram illustrating the cooperation between a vascular anastomosis device and a first and a second blood vessel according to one embodiment.

[0025] Figure 2 for Figure 1 A cross-sectional view of the vascular anastomosis device shown.

[0026] Figure 3 This is a schematic diagram of the structure of a vascular anastomosis device according to one embodiment.

[0027] Figure 4 for Figure 3 A cross-sectional view of the vascular anastomosis device shown.

[0028] Figure 5 This is a schematic diagram of the structure of the first support member in one embodiment.

[0029] Figure 6 for Figure 5 The first support member shown is a cross-sectional view.

[0030] Figure 7 This is a schematic diagram of the structure of a connector according to one embodiment.

[0031] Figure 8 for Figure 7 The cross-sectional view of the connector shown.

[0032] Figure 9 This is a left view of the first support member in one embodiment.

[0033] Figure 10 This is a schematic diagram of the structure of the first support member in another embodiment.

[0034] Figure 11 This is a left view of the first support member in another embodiment.

[0035] Figure 12 This is a schematic diagram of the structure of a snap fastener according to one embodiment.

[0036] Figure 13 This is a schematic diagram of a liner inserted into a second blood vessel according to one embodiment.

[0037] Figure 14 This is a schematic diagram of the connection between the fastener and the second blood vessel in one embodiment.

[0038] Figure 15 This is a schematic diagram of the vascular anastomosis device according to another embodiment.

[0039] Figure 16 This is a schematic diagram of the structure of a vascular anastomosis device according to another embodiment.

[0040] Explanation of reference numerals in the attached figures:

[0041] 10. First support member; 11. First opening; 12. Receiving groove; 121. Slot; 13. Inlet; 131. Serrated structure; 14. Clearance opening; 20. Connector; 21. Tube section; 22. First engaging part; 221. Snap protrusion; 23. Blood flow channel; 231. Groove; 30. Fastener; 31. Through hole; 32. Boss; 40. Second support member; (50, 50a, 50b) First blood vessel; 51. First fistula; (60, 60a, 60b) Second blood vessel; 70. Liner rod. Detailed Implementation

[0042] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0043] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0045] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0047] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0048] See Figures 1 to 4 In some application scenarios, the vascular anastomosis device provided in this application can be used to connect the side of a first blood vessel 50 with the end of a second blood vessel 60. The first blood vessel 50 can be an artery or vein, and a first fistula 51 is provided on its side. The second blood vessel 60 can be a segment of blood vessel cut from an artery or vein. One end of the second blood vessel 60 is connected to the first blood vessel 50 through the first fistula 51, and the other end is ligated. The specific structure of the vascular anastomosis device will be described below in conjunction with this application scenario.

[0049] See Figure 1 as well as Figure 2One embodiment of the anastomosis device includes a first support member 10 and a connector 20. The first support member 10 has two side walls that are disposed opposite to each other. For ease of understanding and description, the side wall facing the first blood vessel 50 in the use state is defined as the inner wall of the first support member 10, and the side wall facing away from the first blood vessel 50 is defined as the outer wall of the first support member 10.

[0050] Specifically, in one embodiment, the first support member 10 is a tubular structure, and the first support member 10 has a first opening 11 penetrating its inner and outer walls. The first support member 10 is used to fit onto the first blood vessel 50 to support the first blood vessel 50, and the first opening 11 corresponds to the position of the first fistula 51. The connector 20 includes a tube portion 21 and a first engaging portion 22 connected to one end of the tube portion 21. The connector 20 has a blood flow channel 23 penetrating the tube portion 21 and the first engaging portion 22 along the axial direction of the tube portion 21. One end of the tube portion 21 connected to the first engaging portion 22 passes through the first opening 11, and the other end of the tube portion 21 is used to communicate with the end of the second blood vessel 60. The first engaging portion 22 is disposed on the inner wall side of the first support member 10. In clinical use, the first engaging portion 22 can be placed in the first blood vessel 50 through the first fistula 51. Furthermore, the first engaging portion 22 engages with the inner wall of the first support member 10, so that the first engaging portion 22 and the inner wall of the first support member 10 together form the first clamping portion. Specifically, the first clamping portion is used to seal and clamp the vessel wall around the first fistula 51 on the first vessel 50, that is, the first engaging portion 22 and the inner wall of the first support member 10 are respectively tightly attached to the vessel wall around the first fistula 51 from the inner and outer sides of the first vessel 50, so as to seal the edge of the first fistula 51.

[0051] In some other embodiments, the first support member 10 may also be a sheet-like structure, having two opposing surfaces. The inner wall of the first support member 10 is the surface facing the first blood vessel 50 in the usage state, and the outer wall of the first support member 10 is the sidewall facing away from the first blood vessel 50 in the usage state. It is understood that the other components of the vascular anastomosis device besides the first support member 10, and the specific way the vascular anastomosis device engages with the blood vessel, can be found in the foregoing embodiments and will not be repeated here.

[0052] In the aforementioned vascular anastomosis device, by sleeved the first support member 10 onto the first blood vessel 50, and aligning the position of the first opening 11 of the first support member 10 with the position of the first fistula 51 on the first blood vessel 50, and simultaneously placing the first engaging portion 22 of the connector 20 into the first blood vessel 50 through the first fistula 51, allowing the first engaging portion 22 to engage with the inner wall of the first support member 10, the first engaging portion 22 and the inner wall of the first support member 10 can respectively seal and clamp the blood vessel wall of the first blood vessel 50 along the edge of the first fistula 51 from both the inner and outer sides of the first blood vessel 50, thereby sealing the edge of the first fistula 51 and allowing blood flow through the connector 20. The channel 23 is connected to the first fistula 51, and the other end of the connector 20 is connected to the second blood vessel 60, thus establishing a blood flow path connecting the first blood vessel 50 and the second blood vessel 60. Compared with the traditional method that requires suturing the first blood vessel 50 and the second blood vessel 60, the vascular anastomosis device of this application does not require suturing the first blood vessel 50 and the second blood vessel 60, making the operation simpler, reducing the requirement for the doctor's operating experience, greatly saving surgical time, improving surgical efficiency, and reducing the probability of vascular intima damage, intraoperative vasospasm, and thrombus formation in the blood vessel caused by suturing, thereby improving surgical safety and postoperative recovery.

[0053] See Figures 4 to 6 In one embodiment, the inner wall of the first support member 10 is provided with a receiving groove 12. Specifically, the receiving groove 12 is positioned corresponding to the first fistula 51 and communicates with the first opening 11. A first engaging portion 22 is disposed in the receiving groove 12 and engages with the groove wall of the receiving groove 12. By disposing the first engaging portion 22 in the receiving groove 12, the first engaging portion 22 is prevented from protruding from the inner wall of the first support member 10, thereby reducing the risk of thrombosis forming in the first blood vessel 50 at the first engaging portion 22. It also avoids reducing the inner diameter of the first support member 10, ensuring smooth blood flow in the first blood vessel 50. In some implementations, the first engaging portion 22 is an arc-shaped thin sheet structure, and the curvature of the side of the first engaging portion 22 near the tube portion 21 is consistent with the curvature of the groove wall of the receiving groove 12, thereby ensuring that the first engaging portion 22 can fit tightly with the groove wall of the receiving groove 12 and improving the sealing effect.

[0054] Further, see Figure 6 as well as Figure 7The receiving groove 12 has a latching protrusion 221 on one side and a latching part 22 on the other side, and a latching groove 121 that matches the latching protrusion 211. That is, the shape and size of the latching groove 121 match the shape and size of the latching protrusion 221. Furthermore, the latching protrusion 221 and the latching groove 121 engage. For example, in this embodiment, latching protrusions 221 are provided on both sides of the first latching part 22, and latching grooves 121 are provided on the opposite sides of the receiving groove 12. The latching protrusions 221 are inserted into the latching grooves 121 one by one, thereby improving the engagement stability between the first latching part 22 and the receiving groove 12, and thus improving the clamping stability of the first blood vessel 50. Understandably, in other embodiments, the protrusion 221 can also be provided on the groove wall of the receiving groove 12. Correspondingly, the groove 121 is formed on the first engaging portion 22. In this way, by inserting the protrusion 221 into the groove 121, the engagement stability between the first engaging portion 22 and the groove wall of the receiving groove 12 can also be improved. In some embodiments, the protrusion 221 is a circular protrusion protruding from the surface of the first engaging portion 22, and correspondingly, the groove 121 is a circular groove, thereby facilitating the insertion of the protrusion 221 into the groove 121.

[0055] See Figure 5 Optionally, in one embodiment, the first support member 10 is a first sleeve, that is, the first support member 10 is a tubular structure with an inner cavity. An inlet 13 is provided on the side of the first support member 10 opposite to the first opening 11. The inlet 13 extends through both ends of the first support member 10 axially and communicates with the inner cavity of the first support member 10. The inlet 13 allows the first blood vessel 50 to be inserted into the inner cavity of the first support member 10, thus allowing the first support member 10 to be fitted onto the first blood vessel 50 without cutting it. In some embodiments, see... Figure 9 The central angle α corresponding to inlet 13 is less than 180°. Here, the central angle α corresponding to inlet 13 refers to the central angle corresponding to the missing arc segment between the opposite side walls of inlet 13 in the outer circle of the projection of the first support member 10 along the axial direction. This ensures that the first support member 10 can better support the vascular tissue of the first blood vessel 50 near the first fistula 51, while also reducing the risk of the first blood vessel 50 detaching from the first support member 10 at inlet 13. For example, the central angle α corresponding to inlet 13 can be 40°, 50°, or 60°.

[0056] See Figure 10 It should be noted that in another embodiment, the central angle α corresponding to the inlet 13 can also be greater than or equal to 180°, that is, the first support member 10 is a sheet structure. In this way, it is more convenient to set the first support member 10 on the first blood vessel 50. At this time, the first support member 10 is fixed on the first blood vessel 50 by using the first engaging part 22 to engage with the inner wall of the first support member 10.

[0057] See Figure 11 Optionally, in one embodiment, the first support member 10 has a serrated structure 131 or a wavy structure formed at the edge of the inlet 13, specifically, as shown in the example. Figure 11 As shown, in a plane perpendicular to the axis of the first support member 10, the edge of the inlet 13 has a serrated structure 131 or a wavy structure. Alternatively, in other embodiments, in a plane parallel to the axis of the first support member 10, the edge of the inlet 13 has a serrated structure 131 or a wavy structure. The serrated structure 131 or the wavy structure can create an uneven structure at the edge of the inlet 13, thereby increasing the friction between the edge of the inlet 13 and the first blood vessel 50, further reducing the risk of the first blood vessel 50 detaching from the first support member 10 at the inlet 13.

[0058] See also Figure 5 Optionally, in one embodiment, the first support member 10 further includes a clearance opening 14, which communicates with the inlet 13. The position of the clearance opening 14 corresponds to the position of the first opening 11 in the circumferential direction of the first support member 10. In some embodiments, the first support member 10 has a clearance opening 14 on each side of the inlet 13. The two clearance openings 14 are arranged opposite to each other and communicate with the inlet 13. The position of the clearance opening 14 corresponds to the position of the first opening 11 in the circumferential direction of the first support member 10. By providing clearance openings 14 in the first support member 10 that communicate with the inlet 13, and making the position of the clearance opening 14 correspond to the position of the first opening 11 in the circumferential direction, when the connector 20 is inserted into the first opening 11 from the inlet 13, the clearance opening 14 can avoid the connector 20, preventing interference between the connector 20 and the two sides of the inlet 13. This ensures that the connector 20 can pass smoothly through the inlet 13 and into the first opening 11 while avoiding overall enlargement of the inlet 13.

[0059] Optionally, in one embodiment, both the first support 10 and the connector 20 are made of polymer materials, such as PC (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene plastic), PP (polypropylene), PE (polyethylene), PTFE (Polytetrafluoroethylene), etc. Compared with metal materials, polymer materials are cheaper and easier to process.

[0060] Optionally, in one embodiment, both the inner wall of the tube 21 and the first engaging portion 22 are provided with a biocompatible protective layer. In some embodiments, the biocompatible protective layer can be a polyurethane film. By providing a biocompatible protective layer on both the inner wall of the tube 21 and the first engaging portion 22, direct contact between the inner wall of the tube 21 and the first engaging portion 22 and blood can be avoided, thereby reducing thrombus formation.

[0061] Optionally, in one embodiment, the outer walls of both the first support member 10 and the tube 21 are covered with biocompatible protective sleeves. In some embodiments, the biocompatible protective sleeves can be made of silicone or polyester. By using biocompatible protective sleeves to prevent the outer walls of the first support member 10 and the tube 21 from directly contacting the subcutaneous tissue, the biocompatibility of the vascular anastomosis device can be improved, reducing the occurrence of rejection. Simultaneously, the contact between the biocompatible protective sleeve and the subcutaneous tissue provides good resistance to displacement of the vascular anastomosis device, reducing displacement and misalignment.

[0062] See Figure 3 Optionally, in one embodiment, the angle between the central axis of the tube 21 and the central axis of the first blood vessel 50 ranges from 40° to 60°. In some embodiments, the angle between the central axis of the tube 21 and the central axis of the first blood vessel 50 is 40°, 50°, or 60°. This better meets hemodynamic requirements, allowing blood flow in the first blood vessel 50 to enter the second blood vessel 60 more smoothly, reducing blood turbulence between the first blood vessel 50 and the second blood vessel 60, and thus optimizing the long-term stenosis problem of the blood flow path.

[0063] See Figure 2 as well as Figure 4 In one embodiment, the vascular anastomosis device further includes a latching member 30, which is nested and engaged with the end of the tube 21 away from the first engaging portion 22. The latching member 30 has a through hole 31 communicating with the blood flow channel 23. The latching member 30 and the tube 21 cooperate to form a second clamping portion, which is used to seal and clamp the vessel wall at the end of the second blood vessel 60. Specifically, see Figure 12 as well as Figure 14 In some embodiments, the latching member 30 is embedded within the tube portion 221, forming a second clamping portion between the latching member 30 and the inner wall of the tube portion 21. When connecting the second blood vessel 60, the end of the second blood vessel 60 is first passed through the through hole 31 of the latching member 30, and then the end of the second blood vessel 60 is turned outwards and fitted onto the outer surface of the latching member 30. See also... Figure 13For ease of operation, the liner 70 can be inserted into the end of the second blood vessel 60 first. Then, the locking member 30 is fitted onto the end of the second blood vessel 60 along the liner 70. After fixing the positions of the second blood vessel 60 and the locking member 30, the port of the second blood vessel 60 is turned outward onto the outer surface of the locking member 30. Then, the liner 70 is removed, completing the effective connection between the locking member 30 and the end of the second blood vessel 60. See also Figure 2 Finally, the buckle 30 is inserted into the tube 21, so that the buckle 30 and the inner wall of the tube 21 together clamp and fix the end of the blood vessel, and make the second blood vessel 60 connected to the blood flow channel 23 of the connector 20, thereby establishing a blood flow path connecting the first blood vessel 50 and the second blood vessel 60 without suturing.

[0064] It is worth noting that in some other embodiments, the fastener 30 may also be sleeved on the outside of the tube 21, forming a second clamping portion between the fastener 30 and the outer wall of the tube 21. Specifically, when connecting the second blood vessel 60, the end of the second blood vessel 60 is first passed through the through hole 31 of the fastener 30, then the end of the second blood vessel 60 is sleeved on the tube 21, and then the fastener 30 is sleeved on the tube 21, so that the fastener 30 and the outer wall of the tube 21 jointly seal and clamp the blood vessel wall at the end of the second blood vessel 60.

[0065] In some embodiments, the fastener 30 is press-fitted with the tube 21, thereby making the fastener 30 fit more tightly with the tube 21 and preventing blood leakage. Furthermore, the fastener 30 is made of a polymer material, such as PC (Polycarbonate), ABS (Acrylonitrile Butadiene Styrene plastic), PP (polypropylene), PE (polyethylene), PTFE (Polytetrafluoroethylene), etc. Compared to metal materials, polymer materials are lower in cost and easier to process.

[0066] See Figure 8 as well as Figure 12 Optionally, in one embodiment, the fastener 30 is provided with a boss 32, and the tube 21 is provided with a groove 231 adapted to the boss. That is, the shape and size of the groove 231 are adapted to the shape and size of the boss 32. In the assembled state, the boss 32 is disposed in the groove 231. This improves the engagement stability between the fastener 30 and the tube 21, prevents the fastener 30 from detaching from the tube 21, and improves the sealing effect between the fastener 30 and the tube 21. In some embodiments, the boss 32 is an annular boss, and there are multiple bosses 32. The multiple bosses 32 are spaced apart along the axial direction of the fastener 30, thereby further improving the sealing effect.

[0067] Understandably, in another embodiment, the boss 32 can also be provided in the tube 21. Correspondingly, the groove 231 is provided in the fastener 30. By providing the boss 32 in the groove 231, the fastener 30 can also be prevented from detaching from the tube 21, while improving the sealing between the fastener 30 and the inner wall of the tube 21.

[0068] After describing the specific structure of the aforementioned vascular anastomosis device, the following section will describe the usage method of one of the vascular anastomosis devices in conjunction with application scenarios. The clinical use of the aforementioned vascular anastomosis device includes the following steps:

[0069] S10a: First, select a first support member 10 and a connector 20 of appropriate size. Then, cut a fistula 51 on the side of the first blood vessel 50. Next, insert the first engaging part 22 of the connector 20 into the first blood vessel 50 from the first fistula 51. Then, put the first support member 10 on the first blood vessel 50 so that the tube part 21 of the connector 20 passes into the first opening 11 of the first support member 10. Pull the connector 20 so that the first engaging part 22 cooperates with the groove wall of the receiving groove 12 and is locked and fixed to clamp the blood vessel wall of the first blood vessel 50 around the first fistula 51.

[0070] Alternatively, S10b: First, insert the connector 20 into the first opening 11 through the inlet 13 of the first support 10, keeping the slot 121 inside the first support 10 and the protrusion 221 on the first engaging part 22 not engaged. Then, put the first support 10 onto the first blood vessel 50, and then cut the first fistula 51 on the first blood vessel 50 on the opposite side of the first opening 11 through the inlet 13. Then, rotate the first support 10 and the connector 20 together by 180° so that the first fistula 51 corresponds to the first opening 11. Then, insert the first engaging part 22 into the first fistula 51 so that the first engaging part 22 cooperates with the groove wall of the receiving groove 12 and is engaged and fixed to clamp the blood vessel wall of the first blood vessel 50 along the edge of the first fistula 51.

[0071] S20: Then, select a suitable size fastener 30 and pre-fit the fastener 30 onto the end of the cut second blood vessel 60. Insert the liner 70 into the port of the second blood vessel 60, fix the position of the second blood vessel 60 and the fastener 30, turn the port of the second blood vessel 60 outward onto the outer surface of the fastener 30, and then remove the liner 70 to complete the effective connection of the fastener 30 and the end of the second blood vessel 60.

[0072] S30: Finally, insert the buckle 30 into the tube 21 so that the buckle 30 and the inner wall of the tube 21 together clamp and fix the end of the blood vessel, thereby establishing a blood flow path connecting the first blood vessel 50 and the second blood vessel 60.

[0073] It is understood that the above-mentioned operation scheme is only a part of the implementation of the method of using the vascular anastomosis device in this application. Other operation schemes that can realize the assembly of the vascular anastomosis device are also within the protection scope of this application, and this application does not make specific limitations on them.

[0074] See Figure 15 In other application scenarios, the vascular anastomosis device provided in one embodiment of this application can also be used to achieve communication between the side of the first blood vessel 50a and the side of the second blood vessel 60a. The specific structure of the vascular anastomosis device will be described below in conjunction with this application scenario.

[0075] See Figure 15 Unlike the aforementioned embodiments, in Figure 15 In the illustrated embodiment, a second fistula (not shown) is also provided on the side of the second blood vessel 60a. The vascular anastomosis device also includes a second support member 40, which is used to fit onto the second blood vessel 60a. The second support member 40 has a second opening (not shown) that corresponds to the position of the second fistula. The connector 20 also includes a second engaging portion (not shown) connected to the end of the tube 21 opposite to the first engaging portion 22. The tube 21 also passes through the second opening. The second engaging portion is disposed on the inner wall side of the second support member 40 and can be placed in the second blood vessel 60a through the second fistula. The second engaging portion cooperates with the inner wall of the second support member 40 so that the second engaging portion and the inner wall of the second support member 40 jointly seal and clamp the blood vessel wall around the second fistula on the second blood vessel 60.

[0076] Specifically, similar to the method in the aforementioned embodiment where the first support member 10 and the first engaging part 22 jointly clamp the first blood vessel 50a, when connecting the second blood vessel 60a, the second support member 40 is sleeved on the second blood vessel 60a, and the second opening position of the second support member 40 corresponds to the second fistula position on the second blood vessel 60a. At the same time, the second engaging part is placed in the second blood vessel 60a through the second fistula, and then the second engaging part is engaged with the inner wall of the second support member 40. This allows the second engaging part and the inner wall of the second support member 40 to clamp the blood vessel wall of the second blood vessel 60a along the edge of the second fistula from the inner and outer sides of the second blood vessel 60a, respectively, so as to seal the edge of the second fistula and make the blood flow channel 23 of the connector 20 communicate with the second fistula, thereby establishing a blood flow path connecting the first blood vessel 50a and the second blood vessel 60a.

[0077] It should be noted that the structure of the second support member 40 is the same as that of the first support member 10, and the structure of the second engaging part is the same as that of the first engaging part 22, which will not be described in detail here.

[0078] Optionally, see Figure 15In one embodiment, the vascular anastomosis device can be integrally shaped like an I-beam, in which case neither the first blood vessel 50a nor the second blood vessel 60a needs to be severed. See also Figure 16 In another embodiment, the vascular anastomosis device can be integrally shaped into a Z-shape. In this case, one end of the first blood vessel 50b can be cut off and ligated, and one end of the second blood vessel 60b can be cut off and ligated. During clinical operation, when it is necessary to connect the parallel first and second blood vessels, either an I-shaped or a Z-shaped vascular anastomosis device can be flexibly selected according to the surgical requirements.

[0079] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0080] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A vascular anastomosis device, characterized in that, include: A first support member, the first support member having a first opening penetrating its inner and outer walls, the first opening being positioned opposite to the first fistula on the first blood vessel; as well as, A connector, comprising a tube and a first engaging portion connected to one end of the tube, wherein the connector has a blood flow channel passing through the tube and the first engaging portion along the axial direction of the tube, the tube being inserted through the first opening, and the first engaging portion being disposed on the inner wall side of the first support member, the first engaging portion cooperating with the inner wall of the first support member to seal and clamp the vessel wall around the first fistula on the first blood vessel; The inner wall of the first support member is provided with a receiving groove, which communicates with the first opening. The first engaging part is disposed in the receiving groove and cooperates with the groove wall of the receiving groove, so that the first engaging part is lower than or flush with the inner wall of the first support member.

2. The vascular anastomosis device according to claim 1, characterized in that, The groove wall of the receiving groove has a locking protrusion on one side and a locking groove on the other side, which is adapted to the locking protrusion. The locking protrusion and the locking groove engage with each other.

3. The vascular anastomosis device according to claim 1, characterized in that, The first support member is a first sleeve. The first support member has an inlet on the side opposite to the first opening. The inlet passes through both ends of the first support member in the axial direction and communicates with the inner cavity of the first support member.

4. The vascular anastomosis device according to claim 3, characterized in that, In a plane perpendicular to the axis of the first support member, the edge of the inlet has a serrated or wavy structure; or, In a plane parallel to the axis of the first support member, the edge of the inlet has a serrated or wavy structure.

5. The vascular anastomosis device according to claim 3, characterized in that, The first support member has a clearance opening, which is connected to the inlet. The position of the clearance opening corresponds to the position of the first opening in the circumferential direction of the first support member.

6. The vascular anastomosis device according to claim 1, characterized in that: The inner wall of the tube and the first engaging portion are both provided with a biocompatible protective layer; and / or, The outer walls of the first support member and the outer walls of the tube are both covered with biocompatible protective sleeves; and / or, The angle between the central axis of the tube and the central axis of the first blood vessel is in the range of 40° to 60°.

7. The vascular anastomosis device according to any one of claims 1-6, characterized in that, The vascular anastomosis device also includes a latching component, which is nested and engaged with the other end of the tube. The latching component has a through hole communicating with the blood flow channel. The latching component and the tube are engaged to seal and clamp the vessel wall at the end of the second blood vessel.

8. The vascular anastomosis device according to claim 7, characterized in that, One of the fastener and the tube is provided with a boss, and the other is provided with a groove that matches the boss, with the boss disposed in the groove.

9. The vascular anastomosis device according to any one of claims 1-6, characterized in that, The vascular anastomosis device further includes a second support member, which has a second opening penetrating its inner and outer walls. The second opening is positioned opposite to the second fistula on the second blood vessel. The connector further includes a second engaging portion connected to the end of the tube portion opposite to the first engaging portion. The tube portion is also inserted through the second opening. The second engaging portion is disposed on the inner wall side of the second support member. The second engaging portion cooperates with the inner wall of the second support member to seal and clamp the blood vessel wall around the second fistula on the second blood vessel.

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