Artificial blood vessel and suturing method thereof

Abstract

The invention relates to an artificial blood vessel and a suturing method thereof.A branch window communicating with a main body inner cavity is formed in the surface of a main body blood vessel body, the window edge of the branch window is provided with a first suturing turnup, a second suturing turnup is arranged at a tube body end opening of the branch blood vessel body, and the second suturing turnup and the first suturing turnup are mutually overlapped; the main body blood vessel and the branch blood vessel form an overlapped flanging body together, and the suture line body at least sews a first circle of suture section and a second circle of suture section on the overlapped flanging body and is used for sewing the first suture flanging and the second suture flanging, so that the tube body port of the branch blood vessel is communicated with the branch window of the main body blood vessel in a sealing manner. By means of the two-circle sewing structure formed by the first circle of sewing section and the second circle of sewing section, the sewing tightness degree between the first sewing turnup and the second sewing turnup can be improved, the sewing strength is improved, and leakage between the main blood vessel and the branch blood vessel is reduced; therefore, the tube body port of the branch blood vessel and the branch window of the main blood vessel are well sealed.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to artificial blood vessels and suturing methods thereof. Background Art

[0002] Standford type A aortic dissection is characterized by rapid onset and high mortality. The aortic arch and three important branch arteries on the aortic arch are often affected. The reconstruction of important branch blood vessels has always been a difficult problem in endovascular treatment. The use of four-branch artificial blood vessels for Sun's surgery and total aortic arch replacement is one of the effective methods for treating Standford type A aortic dissection.

[0003] However, the manufacture of four-branch artificial blood vessels usually involves suturing the separate main blood vessels and branch blood vessels together manually or by other means. The current suturing method cannot ensure an effective connection between the main blood vessels and the branch blood vessels, which can easily lead to insufficient suturing strength and loose suturing at the branch blood vessels, thereby causing local leakage at the anastomosis between the main blood vessels and the branch blood vessels. In addition, the amount of leakage is large, making it impossible to quickly stop bleeding and close the chest during surgery, affecting the effect of the surgery. Summary of the invention

[0004] Based on this, it is necessary to provide an artificial blood vessel and a suturing method thereof in response to the above-mentioned technical problems.

[0005] The present application provides an artificial blood vessel, the artificial blood vessel comprising:

[0006] A main blood vessel, wherein the main blood vessel has a main body lumen with two ends connected therethrough, a branch window communicating with the main body lumen is provided on the surface of the tube body of the main blood vessel, and a window edge of the branch window has a first suture flange surrounding the branch window;

[0007] A branch blood vessel, wherein the branch blood vessel has a branch inner cavity with two ends connected therethrough, and a tube body port of the branch blood vessel has a second suture cuff, the second suture cuff surrounds the tube body port, and the second suture cuff overlaps with the first suture cuff to form a superimposed cuff body;

[0008] A suture body, wherein at least a first circle suture section and a second circle suture section are sewn on the overlapping flange body, and the first circle suture section and the second circle suture section sewn by the suture body are used to sew the first suture flange and the second suture flange, so that the tube body port of the branch blood vessel is sealed and connected with the branch window of the main blood vessel.

[0009] In one embodiment, the overlapping flange body has a first stitching reference track, the first stitching reference track is a ring track surrounding the overlapping flange body, the stitching line body includes a first stitching line segment, and the first stitching line segment is stitched along the first stitching reference track to form the first circle stitching segment; and / or,

[0010] The overlapping flange body is provided with a second suture reference track, which is an annular track surrounding the overlapping flange body. The suture body includes a second suture line segment, and the second suture line segment is sutured along the second suture reference track to form the second circle suture segment.

[0011] In one embodiment, the first suture reference track includes a plurality of first reference points arranged along the track, and the first suture line segment is sutured at each of the first reference points to form a first fixing knot; and / or,

[0012] The second suturing reference track includes a plurality of second reference points arranged along the track, and the second suturing line segments are sutured at each of the second reference points to form a second fixing knot.

[0013] In one embodiment, the first fixing knot comprises at least two coil nodes; and / or,

[0014] The second fixed knot includes at least two coil nodes.

[0015] In one embodiment, the second suture reference trajectory includes a plurality of second connection points, each of the second connection points is located between two adjacent second reference points, and the first suture line segment is sutured between one of the first reference points and a corresponding one of the second connection points to form a first bridging suture segment; and / or,

[0016] The first suture reference trajectory includes a plurality of first connection points, each of which is located between two adjacent first reference points, and the second suture line segment is sutured between one of the second reference points and a corresponding one of the first connection points to form a second bridging suture segment.

[0017] In one embodiment, the first bridging suture segment is connected to the second suture segment; and / or,

[0018] The second bridging suture segment is connected to the first suture segment; and / or,

[0019] All of the first bridging stitching sections and all of the second bridging stitching sections remain substantially parallel.

[0020] In one embodiment, the distance between adjacent first reference points is between 0.7 mm and 1 mm; and / or,

[0021] The distance between adjacent second reference points is between 0.7 mm and 1 mm.

[0022] In one embodiment, the first stitching section is located at the flange edge of the overlapping flange body; and / or,

[0023] The second stitching section is located at the root of the overlapped cuff; and / or,

[0024] The first circle sewing section and the second circle sewing section are substantially parallel to each other, and a width between the first circle sewing section and the second circle sewing section is between 1.5 mm and 2 mm.

[0025] The present application also provides a method for suturing an artificial blood vessel, the method for suturing an artificial blood vessel comprising the following steps:

[0026] The first suture cuff at the branch window of the main blood vessel and the second suture cuff at the tube body port of the branch blood vessel are overlapped to form a superimposed cuff body;

[0027] A first suturing reference track and a second suturing reference track are defined on the overlapped flange body, and a plurality of first reference points and a plurality of first connection points are defined in the first suturing reference track and are arranged in sequence and at intervals, and a plurality of second reference points and a plurality of second connection points are defined in the second suturing reference track and are arranged in sequence and at intervals;

[0028] Control the first suture line segment to pass through one of the first reference points, pass back from a corresponding one of the second connection points, return to the current first reference point to tie a first fixing knot, follow the first suture reference track to the next first reference point, and repeat the above steps;

[0029] Control the second suture line segment to pass through a second reference point, pass back from a corresponding first connection point, return to the current second reference point to tie a second fixing knot, follow the second suture reference trajectory to the next second reference point, and repeat the above steps.

[0030] In one embodiment, the method for suturing the artificial blood vessel comprises the following steps:

[0031] The first suture line segment is sutured along the first suture reference track to form a first loop suture section, the first suture line segment is sutured between the first reference point and the second connection point to form a first bridging suture section, the first suture line segment bypasses the first bridging suture section to tie a first coil knot of the first fixing knot, and the first suture line segment bypasses the first loop suture section to tie a second coil knot of the first fixing knot; and / or,

[0032] The second suture line segment is sutured along the second suture reference trajectory to form a second circle suture section, the second suture line segment is sutured between the second reference point and the first connection point to form a second bridge suture section, the second suture line segment bypasses the second bridge suture section to form a first coil knot of the second fixing knot, and the second suture line segment bypasses the second circle suture section to form a second coil knot of the second fixing knot.

[0033] In one embodiment, the first suture line segment repeatedly passes through and back through the overlapping flange body to sew to form the first loop suture segment, and after the first suture line segment passes through the overlapping flange body at the first reference point, it continues to reversely pass back through the overlapping flange body at the second connection point to form the first bridging suture segment; and / or,

[0034] The second suture line segment repeatedly passes through and back through the overlapping flange body to sew to form the second circle suture section. After the second suture line segment passes through the overlapping flange body at the second reference point, it continues to reversely pass back through the overlapping flange body at the first connection point to form the second bridging suture section.

[0035] In the above-mentioned artificial blood vessel and its suturing method, the branch blood vessel can utilize the second suturing flange on its tube body port to overlap with the first suturing flange of the branch window on the main blood vessel. The mutual overlap of the first suturing flange and the second suturing flange can facilitate the connection between the main blood vessel and the branch blood vessel and improve the connection effect. In addition, the formed overlapping flange body can provide a larger suturing area, which is more convenient for suturing and connection. With the help of the larger suturing area provided by the overlapping flange body, the suture body can sew a first circle suturing section and a second circle suturing section on the overlapping flange body. The first circle suturing section and the second circle suturing section can be used to sew the first suturing flange and the second suturing flange. The two-circle suturing structure formed by the first circle suturing section and the second circle suturing section can improve the suturing tightness between the first suturing flange and the second suturing flange, improve the suturing strength, reduce leakage between the main blood vessel and the branch blood vessel, and form a good seal between the tube body port of the branch blood vessel and the branch window of the main blood vessel. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1A schematic diagram of the connection structure between a main blood vessel and a branch blood vessel provided in one embodiment of the present application.

[0037] Figure 2 For Figure 1 A locally enlarged schematic diagram of the connection position between the main blood vessel and the branch blood vessels is shown.

[0038] Figure 3 A schematic diagram of the suturing structure of a main blood vessel and a branch blood vessel provided in one embodiment of the present application.

[0039] Figure 4 For Figure 1 The diagram shown is a partial enlarged schematic diagram of the suture positions of the main blood vessels and branch blood vessels.

[0040] Figure 5 A schematic diagram of the routing structure of a suture body provided in one embodiment of the present application.

[0041] Figure Number:

[0042] 1000, main blood vessel; 2000, branch blood vessel; 3000, overlapping flange body; 4000, suture body; 5000, first suture reference track; 6000, second suture reference track;

[0043] 1000a, branch window; 3100, first sutured cuff;

[0044] 2000a, tube body end; 3200, second sutured flange;

[0045] 4100, a first suture line segment; 4200, a second suture line segment;

[0046] 4100a, first loop suture segment; 4100b, first bridging suture segment; 4100c, first fixing knot;

[0047] 4200a, second loop suture segment; 4200b, second bridging suture segment; 4200c, second fixing knot;

[0048] 5000a, first reference point; 5000b, first connection point;

[0049] 6000a, second reference point; 6000b, second connection point. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0051] See also Figure 1 As shown, an artificial blood vessel provided by an embodiment of the present application comprises a main blood vessel 1000 and a branch blood vessel 2000. The main blood vessel 1000 has a main body lumen through both ends. A branch window 1000a connected to the main body lumen is provided on the body surface of the main blood vessel 1000. The window edge of the branch window 1000a has a first suture flange 3100, and the first suture flange 3100 surrounds the branch window 1000a. The branch blood vessel 2000 has a branch lumen through both ends. The body port 2000a of the branch blood vessel 2000 has a second suture flange 3200, and the second suture flange 3200 surrounds the body port 2000a. The number of branch blood vessels 2000 can be selected according to demand. For example, the number of branch blood vessels 2000 in the four-branch artificial blood vessel is four. Accordingly, the number of branch windows 1000a on the main blood vessel 1000 is also four, and the body port 2000a of each branch blood vessel 2000 is connected to a matching branch window 1000a. Those skilled in the art may select the number of branch windows 1000a and branch blood vessels 2000 according to needs. For example, the number of branch windows 1000a and branch blood vessels 2000 may be two, three, four, or five, which is not limited here.

[0052] Continue reading Figure 2 As shown, the branch vessel 2000 can overlap the second suture flange 3200 on the tube body port 2000a with the first suture flange 3100 of the branch window 1000a on the main vessel 1000, so that the first suture flange 3100 and the second suture flange 3200 overlap each other to form a superimposed flange body 3000. At this time, in the superimposed flange body 3000 formed by the first suture flange 3100 and the second suture flange 3200 overlapping each other, the position located radially outward is the flange edge, and the position located radially inward is the flange root. The mutual overlap of the first suture flange 3100 and the second suture flange 3200 can facilitate the connection between the main vessel 1000 and the branch vessel 2000, improve the connection effect, and the formed superimposed flange body 3000 can provide a larger suture area, which is more convenient for suture connection.

[0053] Continue reading Figure 3 and Figure 4As shown, the main vessel 1000 and the branch vessel 2000 can be sutured by the suture body 4000, so that the main vessel 1000 and the branch vessel 2000 are connected. Figure 4 As shown, with the help of the larger sewing area provided by the overlapping flange body 3000, the suture body 4000 can sew a first circle sewing section 4100a and a second circle sewing section 4200a on the overlapping flange body 3000, wherein the first circle sewing section 4100a and the second circle sewing section 4200a are sections generated (or sewn) in the process of the suture body 4000 sewing the first sewing flange 3100 and the second sewing flange 3200. Therefore, the first circle sewing section 4100a and the second circle sewing section 4200a sewn by the suture body 4000 can be used to sew the first The suture flange 3100 and the second suture flange 3200, and the two-circle suture structure formed by the first circle suture section 4100a and the second circle suture section 4200a, can improve the suture tightness between the first suture flange 3100 and the second suture flange 3200, improve the suture strength, and reduce leakage between the main blood vessel 1000 and the branch blood vessel 2000, so that the tube body port 2000a of the branch blood vessel 2000 and the branch window 1000a of the main blood vessel 1000 can not only be connected, but also a good seal can be formed at the position where the two are connected, that is, a sealed connection is formed.

[0054] In addition, with the help of the larger suturing area provided by the overlapping flange body 3000, the suture body 4000 can also sew other suture sections on the overlapping flange body 3000 to form a more secure suture pattern, for example, continue to sew the third circle suture section, the fourth coil section, and other sections for firmly and tightly connecting the main blood vessel 1000 and the branch blood vessel 2000, which are not limited here.

[0055] The first stitching section 4100a and the second stitching section 4200a can be sewn in a variety of ways, see Figure 4 and Figure 5As shown, in one embodiment, a first suturing reference trajectory 5000 and a second suturing reference trajectory 6000 can be formed on the overlapping flange body 3000 as a reference for the routing of the suture body 4000, wherein the overlapping flange body 3000 is composed of a first suturing flange 3100 and a second suturing flange 3200, so the overlapping flange body 3000 is actually also an annular flange body surrounding the tube body port 2000a and the branch window 1000a, therefore, the first suturing reference trajectory 5000 is an annular trajectory surrounding the overlapping flange body 3000, and the second suturing reference trajectory 6000 is also an annular trajectory surrounding the overlapping flange body 3000. The suture body 4000 includes a first suture segment 4100 and a second suture segment 4200. The first suture segment 4100 can be routed along a first suture reference trajectory 5000 to sew and form a first circle suture segment 4100a. The second suture segment 4200 can be routed along a second suture reference trajectory 6000 to sew and form a second circle suture segment 4200a.

[0056] See also Figure 4 As shown, the first circle sewing section 4100a is located at the flange edge of the overlapping flange body 3000, and the second circle sewing section 4200a is located at the flange root of the overlapping flange body 3000. The first circle sewing section 4100a and the second circle sewing section 4200a are basically parallel, wherein basically parallel means that the first circle sewing section 4100a and the second circle sewing section 4200a remain parallel to each other, but since the first circle sewing section 4100a and the second circle sewing section 4200a are manually stitched, there may be a reasonable tilt error. For example, if there is a tilt error of less than 5 degrees between the first circle sewing section 4100a and the second circle sewing section 4200a, it can be understood that they are basically parallel. The width between the first stitching section 4100a and the second stitching section 4200a is between 1.5 mm and 2 mm, for example, the width between the first stitching section 4100a and the second stitching section 4200a is 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, etc., which is not limited here. In addition, those skilled in the art can also sew the first stitching section 4100a and the second stitching section 4200a in other routing ways, for example, directly sewing on the overlapping flange body 3000 without pre-defining the trajectory, which is not limited here.

[0057] Continue reading Figure 5As shown, in one embodiment, the first suture reference track 5000 includes a plurality of first reference points 5000a arranged along the track of the first suture reference track 5000, wherein the distance between adjacent first reference points 5000a is between 0.7mm and 1mm, for example, the distance between adjacent first reference points 5000a is 0.7mm, 0.8mm, 0.9mm, 1mm, etc. During the routing process, the first suture line segment 4100 can be sutured on each first reference point 5000a to form one or more first fixing knots 4100c, and the first fixing knot 4100c can be knotted in a variety of ways, for example, the first fixing knot 4100c includes at least two coil knots, each coil knot is formed by winding the first suture line segment 4100 into a coil and then knotting, therefore, the first fixing knot 4100c can effectively improve the suture strength between the first suture cuff 3100 and the second suture cuff 3200, and improve the sealing effect of the suture.

[0058] The first fixed knot 4100c is taken as an example of two coil knots, see Figure 5 As shown, the first suture segment 4100 can bypass the first jumper suture segment 4100b at the first reference point 5000a to form the first coil node of the first fixing knot 4100c, wherein the first jumper suture segment 4100b is formed by passing through the overlapping flange body 3000 at the first reference point 5000a and then passing back into the overlapping flange body 3000 at the second connection point 6000b. Therefore, the first jumper suture segment 4100b has two lines, namely an entry line and a return line. The first suture segment 4100 can bypass one or both of the lines to form the first coil node, and the bypassing method can be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. Next, the first suture segment 4100 can continue to wrap around the first circle suture segment 4100a to form a second coil knot of the first fixing knot 4100c, and the wrapping method can also be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. After forming the second coil knot, the first suture segment 4100 can press the first jumper suture segment 4100b to continue to route to the next first reference point 5000a to repeat the routing and suture.

[0059] Similarly, the second suturing reference trajectory 6000 includes a plurality of second reference points 6000a arranged along the trajectory of the second suturing reference trajectory 6000, wherein the distance between adjacent second reference points 6000a is between 0.7mm and 1mm, for example, the distance between adjacent second reference points 6000a is 0.7mm, 0.8mm, 0.9mm, 1mm, etc. During the routing process, the second suture segment 4200 can be sewn at each second reference point 6000a to form one or more second fixing knots 4200c. The second fixing knot 4200c can adopt a variety of knotting forms. The specific knotting structure of the second fixing knot 4200c can be the same as or different from the first fixing knot 4100c, wherein the first fixing knot 4100c can also include at least two coil nodes, each coil node is formed by winding the second suture segment 4200 into a coil and then knotting it. Therefore, the use of the second fixing knot 4200c can also effectively improve the suture strength between the first suture flange 3100 and the second suture flange 3200, and improve the sealing effect of the suture.

[0060] The second fixing knot 4200c is taken as an example of tying two coil knots, see Figure 5 As shown, the second suture segment 4200 can bypass the second jumper suture segment 4200b at the second reference point 6000a to form the first coil node of the second fixed knot 4200c, wherein the second jumper suture segment 4200b is formed by passing through the overlapping flange body 3000 at the second reference point 6000a and then passing back into the overlapping flange body 3000 at the first connection point 5000b. Therefore, the second jumper suture segment 4200b has two lines, namely an entry line and a return line. The second suture segment 4200 can bypass one or both of the lines to form the first coil node, and the bypassing method can be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. Next, the second suture segment 4200 can continue to wrap around the second circle suture segment 4200a to form a second coil node of the second fixed knot 4200c, and the wrapping method can also be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. After forming the second coil node, the second suture segment 4200 can press the second jumper suture segment 4200b to continue routing to the next second reference point 6000a to repeat the routing and suture.

[0061] Continue reading Figure 5As shown, in one embodiment, the second suture reference trajectory 6000 also includes a plurality of second connection points 6000b, each of the second connection points 6000b is located between two adjacent second reference points 6000a, and the second connection points 6000b are used to form interconnected sutures with the first suture line segment 4100. Among them, each second connection point 6000b in the second suture reference trajectory 6000 forms a one-to-one match with a first reference point 5000a at a corresponding position in the first suture reference trajectory 5000, that is, the number of the second connection points 6000b and the first reference points 5000a is equal and forms a corresponding match in position. Therefore, during the routing process, the first suture segment 4100 can be sutured between a first reference point 5000a and a corresponding second connection point 6000b to form a first bridging suture section 4100b. The first bridging suture section 4100b can be a straight line section formed by a simple insertion and back-threading, or it can be a section of other shapes formed by a complex routing method, which is not limited here. With the help of the first bridging suture section 4100b, the first suture segment 4100 can not only be routed and sutured in the first suture reference trajectory 5000, but also can form a longitudinal interconnected suture with multiple second connection points 6000b on the second suture reference trajectory 6000, thereby improving the suture strength and suture sealing effect.

[0062] Continue reading Figure 5 As shown, similarly, the first suture reference trajectory 5000 also includes a plurality of first connection points 5000b, each of which is located between two adjacent first reference points 5000a, and the first connection point 5000b is used to form interconnected sutures with the second suture line segment 4200. Among them, each first connection point 5000b in the first suture reference trajectory 5000 forms a one-to-one match with a second reference point 6000a at a corresponding position in the second suture reference trajectory 6000, that is, the number of first connection points 5000b and second reference points 6000a is equal and forms a corresponding match in position. Therefore, during the routing process, the second suture segment 4200 can be sutured between a second reference point 6000a and a corresponding first connection point 5000b to form a second jumper suture section 4200b. The second jumper suture section 4200b can be a straight line section formed by a simple insertion and back-threading, or it can be a section of other shapes formed by a complex routing method, which is not limited here. With the help of the second jumper suture section 4200b, the second suture segment 4200 can not only be routed and sutured in the second suture reference trajectory 6000, but also can form a longitudinal interconnected suture with multiple first connection points 5000b on the first suture reference trajectory 5000, thereby improving the suture strength and suture sealing effect.

[0063] See also Figure 5 As shown, in one embodiment, the first jumper stitching section 4100b and the second jumper stitching section 4200b can be basically parallel to each other, wherein basically parallel means that the first jumper stitching section 4100b and the second jumper stitching section 4200b remain parallel to each other, but since the first jumper stitching section 4100b and the second jumper stitching section 4200b are stitched by hand, there can be a reasonable tilt error, for example, a tilt error of less than 5 degrees between the first jumper stitching section 4100b and the second jumper stitching section 4200b can be understood as basically parallel to each other.

[0064] Continue reading Figure 5 As shown, during the process of the first suture segment 4100 being routed and sewn to form the first jumper suture segment 4100b, the first suture segment 4100 may be routed only at the second connection point 6000b, passing through the overlapping flange body 3000 without forming a connection with the second suture segment 4200, or the first suture segment 4100 may be connected with the second suture segment 4200 in the process of passing through the second connection point 6000b, for example, by bypassing the second suture segment 4200 to form a connection with the second suture segment, thereby improving the connection effect. Similarly, when the second suture segment 4200 is being routed and sewn to form the second jumper suture segment 4200b, the second suture segment 4200 may only be routed at the first connection point 5000b, passing through the overlapping flange body 3000 without forming a connection with the first suture segment 4100, or the second suture segment 4200 may also be connected to the first suture segment 4100 while passing through the first connection point 5000b, for example, by bypassing the first suture segment 4100 to form a connection with the first suture segment, thereby improving the connection effect.

[0065] The present application also provides a method for suturing an artificial blood vessel, which comprises the following steps: the branch window 1000a of the main blood vessel 1000 has a first suturing flange 3100, and the tube body port 2000a of the branch blood vessel 2000 has a second suturing flange 3200. The first suturing flange 3100 and the second suturing flange 3200 are overlapped with each other to form a superimposed flange body 3000, and a first suturing reference trajectory 5000 and a second suturing reference trajectory 6000 are defined on the superimposed flange body 3000. A plurality of first reference points 5000a and first connection points 5000b arranged at intervals are defined in the first suturing reference trajectory 5000, and a plurality of second reference points 6000a and second connection points 6000b arranged at intervals are defined in the second suturing reference trajectory 6000.

[0066] During specific routing and stitching, the first suture line segment 4100 is controlled to pass through a first reference point 5000a. The direction of passage may be from the first suture flange 3100 toward the second suture flange 3200, and pass back in the opposite direction from a corresponding second connection point 6000b. After the routing returns to the current first reference point 5000a, the first fixing knot 4100c is tied. After following the first suture reference trajectory 5000 to the next first reference point 5000a, the above steps are repeated. Similarly, the second suture line segment 4200 is controlled to pass through a second reference point 6000a. The passing direction can be from the first suture flange 3100 toward the second suture flange 3200, or from the second suture flange 3200 toward the first suture flange 3100, and pass back from a corresponding first connection point 5000b in the opposite direction, return to the current second reference point 6000a, tie a second fixing knot 4200c, and repeat the above steps after reaching the next second reference point 6000a along the second suture reference trajectory 6000.

[0067] During the suturing process of the artificial blood vessel, the first suture segment 4100 is sutured along the first suture reference trajectory 5000 to form a first circle suture segment 4100a, and the first suture segment 4100 is sutured between the first reference point 5000a and the second connection point 6000b to form a first bridging suture segment 4100b. Therefore, the first suture segment 4100 can bypass the first bridging suture segment 4100b at the first reference point 5000a to form a first coil node of the first fixing knot 4100c, wherein the first bridging suture segment 4100b is formed by passing through the overlapping cuff body 3000 at the first reference point 5000a and then passing back through the overlapping cuff body 3000 at the second connection point 6000b. Therefore, the first bridging suture segment 4100b has two lines, namely, an entry line and a return line. The first suture segment 4100 can bypass one or both of the lines to form a first coil node, and the bypassing method can be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. Next, the first suture segment 4100 can continue to wrap around the first circle suture segment 4100a to form a second coil knot of the first fixing knot 4100c, and the wrapping method can also be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. After forming the second coil knot, the first suture segment 4100 can press the first jumper suture segment 4100b to continue to route to the next first reference point 5000a to repeat the routing and suture.

[0068] The second suture segment 4200 is sutured along the second suture reference trajectory 6000 to form a second circle suture segment 4200a, and the second suture segment 4200 is sutured between the second reference point 6000a and the first connection point 5000b to form a second jump suture segment 4200b. Therefore, the second suture segment 4200 can bypass the second jump suture segment 4200b at the second reference point 6000a to form the first coil node of the second fixing knot 4200c, wherein the second jump suture segment 4200b is formed by passing through the overlapping flange body 3000 at the second reference point 6000a and then passing back to the overlapping flange body 3000 at the first connection point 5000b. Therefore, the second jump suture segment 4200b has two lines, namely, an entry line and a return line. The second suture segment 4200 can bypass one or both of the lines to form the first coil node, and the bypassing method can be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. Next, the second suture segment 4200 can continue to wrap around the second circle suture segment 4200a to form a second coil node of the second fixed knot 4200c, and the wrapping method can also be from the bottom layer to the upper layer, or from the upper layer to the bottom layer. After forming the second coil node, the second suture segment 4200 can press the second jumper suture segment 4200b to continue routing to the next second reference point 6000a to repeat the routing and suture.

[0069] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0070] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An artificial blood vessel, characterized in that: The artificial blood vessel comprises: A main blood vessel, wherein the main blood vessel has a main body lumen with two ends connected therethrough, a branch window communicating with the main body lumen is provided on the surface of the tube body of the main blood vessel, and a window edge of the branch window has a first suture flange surrounding the branch window; A branch blood vessel, wherein the branch blood vessel has a branch inner cavity with two ends connected therethrough, and a tube body port of the branch blood vessel has a second suture cuff, the second suture cuff surrounds the tube body port, and the second suture cuff overlaps with the first suture cuff to form a superimposed cuff body; A suture body, wherein at least a first circle suture section and a second circle suture section are sewn on the overlapping flange body, and the first circle suture section and the second circle suture section sewn by the suture body are used to sew the first suture flange and the second suture flange, so that the tube body port of the branch blood vessel is sealed and connected with the branch window of the main blood vessel.

2. The artificial blood vessel according to claim 1, characterized in that: The overlapping flange body has a first suture reference track, which is a ring track surrounding the overlapping flange body, and the suture body includes a first suture line segment, which is sutured along the first suture reference track to form the first circle suture segment; and / or, The overlapping flange body is provided with a second suture reference track, which is an annular track surrounding the overlapping flange body. The suture body includes a second suture line segment, and the second suture line segment is sutured along the second suture reference track to form the second circle suture segment.

3. The artificial blood vessel according to claim 2, characterized in that: The first suturing reference track includes a plurality of first reference points arranged along the track, and the first suturing line segment is sutured at each of the first reference points to form a first fixing knot; and / or, The second suturing reference track includes a plurality of second reference points arranged along the track, and the second suturing line segments are sutured at each of the second reference points to form a second fixing knot.

4. The artificial blood vessel according to claim 3, characterized in that: The first fixing knot comprises at least two coil nodes; and / or, The second fixed knot includes at least two coil nodes.

5. The artificial blood vessel according to claim 3, characterized in that: The second stitching reference track includes a plurality of second connection points, each of the second connection points is located between two adjacent second reference points, and the first stitching line segment is stitched between one of the first reference points and a corresponding one of the second connection points to form a first bridging stitching segment; and / or, The first suture reference trajectory includes a plurality of first connection points, each of which is located between two adjacent first reference points, and the second suture line segment is sutured between one of the second reference points and a corresponding one of the first connection points to form a second bridging suture segment.

6. The artificial blood vessel according to claim 5, characterized in that: The first bridging suture segment is connected to the second suture segment; and / or, The second bridging suture segment is connected to the first suture segment; and / or, All of the first bridging stitching sections and all of the second bridging stitching sections remain substantially parallel.

7. The artificial blood vessel according to claim 3, characterized in that: The distance between adjacent first reference points is between 0.7 mm and 1 mm; and / or, The distance between adjacent second reference points is between 0.7 mm and 1 mm.

8. The artificial blood vessel according to claim 1, characterized in that: The first stitching section is located at the flange edge of the overlapping flange body; and / or, The second stitching section is located at the root of the overlapped cuff; and / or, The first circle sewing section and the second circle sewing section are substantially parallel to each other, and a width between the first circle sewing section and the second circle sewing section is between 1.5 mm and 2 mm.

9. A method for suturing an artificial blood vessel, characterized in that: The suturing method of the artificial blood vessel comprises the following steps: The first suture cuff at the branch window of the main blood vessel and the second suture cuff at the tube body port of the branch blood vessel are overlapped to form a superimposed cuff body; A first suturing reference track and a second suturing reference track are defined on the overlapped flange body, and a plurality of first reference points and a plurality of first connection points are defined in the first suturing reference track and are arranged in sequence and at intervals, and a plurality of second reference points and a plurality of second connection points are defined in the second suturing reference track and are arranged in sequence and at intervals; Control the first suture line segment to pass through one of the first reference points, pass back from a corresponding one of the second connection points, return to the current first reference point to tie a first fixing knot, follow the first suture reference track to the next first reference point, and repeat the above steps; Control the second suture line segment to pass through a second reference point, pass back from a corresponding first connection point, return to the current second reference point to tie a second fixing knot, follow the second suture reference trajectory to the next second reference point, and repeat the above steps.

10. The method for suturing an artificial blood vessel according to claim 9, characterized in that: The suturing method of the artificial blood vessel comprises the following steps: The first suture line segment is sutured along the first suture reference track to form a first loop suture section, the first suture line segment is sutured between the first reference point and the second connection point to form a first bridging suture section, the first suture line segment bypasses the first bridging suture section to tie a first coil knot of the first fixing knot, and the first suture line segment bypasses the first loop suture section to tie a second coil knot of the first fixing knot; and / or, The second suture line segment is sutured along the second suture reference trajectory to form a second circle suture section, the second suture line segment is sutured between the second reference point and the first connection point to form a second bridge suture section, the second suture line segment bypasses the second bridge suture section to form a first coil knot of the second fixing knot, and the second suture line segment bypasses the second circle suture section to form a second coil knot of the second fixing knot.

11. The method for suturing an artificial blood vessel according to claim 10, characterized in that: The first stitching line segment repeatedly passes through and back through the overlapping flange body to stitch and form the first stitching section, and after the first stitching line segment passes through the overlapping flange body at the first reference point, it continues to reversely pass back through the overlapping flange body at the second connection point to form the first bridging stitching section; and / or, The second suture line segment repeatedly passes through and back through the overlapping flange body to sew to form the second circle suture section. After the second suture line segment passes through the overlapping flange body at the second reference point, it continues to reversely pass back through the overlapping flange body at the first connection point to form the second bridging suture section.

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