Anastomosis stent and delivery device therefor

Abstract

The present application discloses an anastomosis stent and a delivery device therefor. The delivery device comprises: an inner tube, a sheath tube, and a puncture assembly which are coaxially arranged. The inner tube is of a hollow structure; the sheath tube is sleeved on the inner tube, and the sheath tube can move axially along the inner tube; the anastomosis stent is sleeved on the inner tube and is located in a gap between the inner tube and the sheath tube; at least part of the anastomosis stent is exposed by means of the sheath tube moving along an axis; the puncture assembly comprises a puncture head and a fixing rope; one end of the fixing rope is connected to the puncture head by means of a channel of the inner tube; and during assembly of the puncture assembly, the puncture head is fixed to a head end of the sheath tube by tightening the fixing rope. By using the delivery device, the interference of the puncture head on the release of the anastomosis stent can be avoided.

Description

An anastomotic stent and its delivery device Technical Field

[0001] This application relates to the field of medical device technology, and in particular to an anastomotic stent and its delivery device. Background Technology

[0002] Pancreatic fistula is the most serious complication after pancreatectomy. Pancreatic surgeons have been striving to reduce its risk through technological advancements and medication, but even in large pancreatic surgery centers, the incidence of postoperative pancreatic fistula remains as high as 3-45%. Pancreatic fistula, especially in patients who have undergone pancreaticojejunostomy, is the most significant risk factor for poor prognosis. It can lead to intraperitoneal fluid accumulation, delayed gastric emptying, abdominal infection, bleeding, reoperation, and even death.

[0003] Although several risk factors for pancreatic fistula have been identified, including a soft pancreas, a small main pancreatic duct, and a posterior pancreatic duct, the only factor that surgeons can control is the pancreaticojejunostomy technique. Currently, various pancreaticojejunostomy methods differ, but the basic concept is mostly based on the direct anastomosis of the pancreatic duct and jejunal mucosa, with a polymeric material scaffold fixed between the pancreatic duct and jejunal mucosa to support the anastomosis and drain pancreatic juice.

[0004] Current methods require first creating an opening in the intestine, then placing a polymeric stent into the pancreatic duct, and finally suturing the pancreatic duct to the jejunal mucosa. This approach suffers from several problems, including poor matching between the polymeric stent diameter and the pancreatic duct diameter, poor matching between the intestinal opening and the pancreatic duct diameter, difficulty in anastomosing the pancreatic duct to the jejunal mucosa, and a large physical gap at the anastomosis site, all of which can lead to pancreatic fistula. Furthermore, the small diameter of the polymeric stent increases the risk of long-term blockage, easily causing pancreaticojejunostomy stenosis and recurrent pancreatitis.

[0005] In addition, in existing methods, a puncture needle is usually used to puncture the jejunum and enter the pancreatic duct, and then a stent is released to directly anastomose the pancreatic duct with the jejunal mucosa. However, in this method, the puncture tip of the puncture needle usually interferes with the release of the anastomotic stent, which is not conducive to the smooth release of the stent into place. Summary of the Invention

[0006] To address the shortcomings of existing technologies, the present invention aims to provide an anastomotic stent and its delivery device, which can avoid interference from the puncture head in the release of the anastomotic stent.

[0007] To achieve the above objectives, one technical solution adopted by the present invention is to provide an anastomosis stent and its delivery device, wherein the delivery device comprises:

[0008] The inner tube, sheath, and puncture assembly are coaxially arranged; the inner tube is hollow; the sheath is sleeved on the inner tube and is movable along the axial direction of the inner tube; the anastomosis stent is sleeved on the inner tube and located in the gap between the inner tube and the sheath, and at least a portion of the anastomosis stent is exposed by the movement of the sheath along the axis.

[0009] The puncture assembly includes a puncture head and a fixing rope, one end of which is connected to the puncture head via a channel in the inner tube.

[0010] During assembly, the puncture head is fixed to the head end of the sheath by the fixing rope.

[0011] Optionally, during assembly, the tip of the sheath is at least partially inserted into the puncture head.

[0012] Optionally, the cross-sectional dimensions of the tip of the sheath gradually decrease in the direction toward the puncture head.

[0013] Optionally, the sheath has multiple incisions on the wall surrounding it at its tip. These incisions are evenly distributed along the circumferential direction of the sheath, and the width of each incision gradually increases in the direction toward the puncture head.

[0014] The sheath has an elastic sleeve at its head end, and the multiple cuts of the elastic sleeve converge to make the head end of the sheath shaped like a cone or approximately like a cone.

[0015] Optionally, the head end of the sheath has a beveled portion, the cutting surface of which is inclined to the axial direction of the sheath.

[0016] Optionally, the tail end of the puncture head has an installation channel, and the head end of the puncture head is a pointed tip for puncturing tissue; one end of the fixing rope is fixedly connected to the installation channel.

[0017] The oblique cut portion is at least partially inserted into the installation channel.

[0018] Optionally, the conveyor further includes a first connector, which is fixedly sleeved on the sheath, and the sheath can be moved axially by applying force to the first connector.

[0019] Optionally, the conveyor further includes a thrust tube; the thrust tube is sleeved on the inner tube; the thrust tube is used to push against the anastomosis stent to prevent the anastomosis stent from moving synchronously when the sheath moves axially.

[0020] Optionally, the conveyor further includes a second connector, which is fixedly connected to the inner tube, and the inner tube can be moved axially by applying force to the second connector.

[0021] Optionally, the sheath is made of a transparent material so that the anastomotic stent can be viewed through the sheath.

[0022] To achieve the above objectives, one technical solution adopted by the present invention is: providing an anastomotic stent, which is used to be placed in the delivery device as described above and delivered to a designated tissue via the delivery device, the anastomotic stent comprising:

[0023] Braided support and a film covering the braided support;

[0024] The opening at one end of the braided support forms multiple grooves by bending the braided yarns, and the multiple grooves are arranged in a serrated shape along the end of the braided support. The edge shape of the film matches the multiple grooves.

[0025] Optionally, the braided support has a first support tube and a second support tube, the first support tube and the second support tube are connected, wherein the diameter of the first support tube is larger than the diameter of the second support tube;

[0026] The film extends from the first support tube to the second support tube.

[0027] Optionally, the outer contour of the first support tube is spherical or ellipsoidal.

[0028] Optionally, the distance D from the edge of the film to the edge of the braided support does not exceed 1.4 mm.

[0029] Optionally, the edge of the film does not extend beyond the edge of the braided support, and the distance L2 between the edge of the film and the edge of the braided support is not less than 4 mm, and the length L3 of the film is not less than 10 mm.

[0030] This invention provides an anastomotic stent and its delivery device. By using a fixing rope to secure the puncture head to the tip of the sheath, stability of the puncture head can be ensured during tissue puncture. After puncture, the fixing rope can be released to detach the puncture head from the sheath. The surgeon can then use forceps or other instruments to remove the puncture head, avoiding interference with the release of the anastomotic stent. Furthermore, during assembly, the tip of the sheath is at least partially inserted into the puncture head, thereby improving the stability of the puncture head during tissue puncture. Attached Figure Description

[0031] Figure 1 is a structural schematic diagram of an embodiment of a conveyor provided in this application;

[0032] Figure 2 is a partial enlarged view of the conveyor shown in Figure 1 in region II;

[0033] Figure 3 is a schematic diagram of the manufacturing process of the sheath tube in the conveyor shown in Figure 1;

[0034] Figure 4 is a schematic diagram of the puncture assembly in the conveyor shown in Figure 1;

[0035] Figure 5 is a schematic diagram of the assembly of the puncture assembly in the conveyor shown in Figure 1.

[0036] Figures 6-10 are schematic diagrams illustrating the usage process of an embodiment of the conveyor provided in this application;

[0037] Figure 11 is a schematic diagram of the delivery device shown in Figure 1 releasing the anastomosis stent;

[0038] Figure 12 is a partial enlarged view of the conveyor shown in Figure 11 in region II;

[0039] Figure 13 is a structural schematic diagram of an embodiment of an anastomotic stent provided in this application;

[0040] Figure 14 is a structural schematic diagram of another embodiment of an anastomotic stent provided in this application. Detailed Implementation

[0041] 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.

[0042] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, 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.

[0043] Furthermore, the terms "first" and "second" are used 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 as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0044] 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 according to the specific circumstances.

[0045] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through 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. "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.

[0046] It should be noted that when 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. When 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. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Please refer to Figures 1 and 2. Figure 1 is a structural schematic diagram of an embodiment of a conveyor provided in this application; Figure 2 is a partial enlarged view of the conveyor shown in Figure 1 in region II.

[0048] This application provides a delivery device 10 for anastomotic stents, the delivery device 10 comprising:

[0049] The inner tube 110, sheath 120, and puncture assembly 130 are coaxially arranged; the inner tube 110 has a hollow structure; the sheath 120 is sleeved on the inner tube 110 and can move along the axial direction of the inner tube; the anastomotic stent A is sleeved on the inner tube 110 and is located in the gap between the inner tube 110 and the sheath 120, and at least part of the anastomotic stent A is exposed by the movement of the sheath 120 along the axis.

[0050] The puncture assembly 130 includes a puncture head 131 and a fixing rope 132. One end of the fixing rope 132 is connected to the puncture head 131 through the channel of the inner tube 110. When the puncture assembly 130 is assembled, the puncture head 131 is tightened and fixed to the head end of the sheath 120 by the fixing rope 132.

[0051] Therefore, by using the fixing rope 132 to tighten and fix the puncture head 131 to the tip of the sheath 120, the stability of the puncture head 131 can be ensured when puncturing the tissue; and after the puncture is completed, the fixing rope 132 can be loosened to allow the puncture head 131 to detach from the sheath 120. At this time, the surgeon can use forceps or other instruments to remove the puncture head 131, thus avoiding interference with the release of the anastomotic stent.

[0052] Furthermore, in this embodiment, during the assembly of the puncture assembly 130, the tip of the sheath 120 is at least partially inserted into the puncture head 131, thereby improving the stability of the puncture head 131 when puncturing tissue.

[0053] Optionally, the cross-sectional dimensions of the tip of the sheath 120 gradually decrease in the direction towards the puncture head 131. The advantage of this design is that it facilitates the insertion of the sheath 120 into the puncture head 131, allowing for seamless integration with the puncture head 131 for intestinal puncture; and after removing the puncture head 131, it makes it easier to insert the sheath 120 into the pancreatic duct, reducing the risk of damage to the pancreatic duct.

[0054] Optionally, the head end of the sheath 120 has a beveled portion 121, the cutting surface 1211 of which is inclined to the axial direction of the sheath 120.

[0055] In this embodiment, the oblique cut 121 at the head end of the sheath 120 can be formed by opening a notch at the head end of the sheath 120 and fixing the head end of the sheath 120 with a heat shrink tubing sleeve.

[0056] For details, please refer to Figure 3. Figure 3 is a schematic diagram of the manufacturing process of the sheath in the conveyor shown in Figure 1.

[0057] The sheath 120 has multiple incisions 122 on the wall surrounding it. The multiple incisions 122 are evenly distributed along the circumference of the sheath 120, and the width of each incision 122 gradually increases in the direction towards the puncture head 131. The sheath 120 is fitted with an elastic sleeve 123, which gathers the multiple incisions 122 together so that the sheath 120 is shaped like a cone or approximately like a cone.

[0058] The cut 122 can be a triangular cut 122. The elastic sleeve 123 can be formed by heat-shrinking a heat-sealing tube. By fitting the heat-sealing tube onto the tip region of the sheath 120 and heating it, the heat-sealing tube can be shrunk, causing the multiple cuts 122 at the tip of the sheath 120 to close, thereby forming a cone or near-cone at the tip of the sheath 120. Then, by making an oblique cut at the location of the cone, an oblique cut portion 121 as described above can be formed.

[0059] Further, please refer to Figures 4 and 5. Figure 4 is a structural schematic diagram of the puncture assembly in the conveyor shown in Figure 1; Figure 5 is a structural schematic diagram of the puncture assembly in the conveyor shown in Figure 1 during assembly.

[0060] In this embodiment, the tail end of the puncture head 131 has an installation channel 1311, and the head end of the puncture head 131 is a pointed tip for puncturing tissue; one end of the fixing rope 132 is fixedly connected to the installation channel 1311; the oblique cut 121 is at least partially inserted into the installation channel 1311.

[0061] The puncture head 131 is provided with a stepped groove 1312 on its outer surface. The stepped groove 1312 facilitates the use of instruments such as tweezers to grasp and remove the puncture head 131.

[0062] Optionally, the conveyor 10 further includes a first connector 140, which is fixedly sleeved on the sheath 120. By applying force to the first connector 140, the sheath 120 can move axially.

[0063] Optionally, the delivery device 10 also includes a thrust tube 150; the thrust tube 150 is sleeved on the inner tube 110; the thrust tube 150 is used to push against the anastomosis stent A to prevent the anastomosis stent A from moving synchronously when the sheath moves axially.

[0064] Optionally, the conveyor 10 also includes a second connector 160, which is fixedly sleeved on the inner tube 110. By applying force to the second connector 160, the inner tube 110 can move axially.

[0065] A specific implementation scenario of the anastomotic stent and its delivery device provided in this application is as follows:

[0066] In this implementation scenario, the delivery device 10 can be used for pancreatic duct-jejunostomy.

[0067] Please refer to Figures 6-10. Figures 6-10 are schematic diagrams illustrating the usage process of an embodiment of the delivery device provided in this application. The anastomosis stent A is sleeved on the outer layer of the inner tube 110; the anastomosis stent A is housed within the sheath tube 120.

[0068] Step 1: Referring to Figures 6 and 7, insert the puncture needle 131 into the jejunum M at the predetermined puncture entry point a and exit at the predetermined puncture exit point b. Point a is the predetermined location for choledochojejunostomy, and point b is the predetermined location for pancreaticojejunostomy.

[0069] Step 2: After the needle is inserted, the surgical staff cuts the fixation rope 132 and removes the puncture needle 131.

[0070] Step 3: Referring to Figure 8, after removing the puncture needle 131, the tip of the sheath 120 can be exposed. At this point, the tip of the sheath 120 can enter the pancreatic duct N of the pancreas. It should be noted that since the pancreas has been partially removed, the pancreatic duct N is exposed with its opening to the outside. The tip of the sheath 120 can then enter the pancreatic duct N along this exposed opening. The depth of entry is indicated by the markings on the transparent sheath. At this point, the second stent body is located inside the pancreatic duct, and the first stent body is located outside the pancreatic duct.

[0071] Step 4: Referring to Figure 9, the sheath 120 is then moved axially backward. During this process, the anastomotic stent A can be gradually released from the sheath 120. After being released from the sheath 120, the anastomotic stent A expands to adhere to the inner wall of the pancreatic duct and is fixed in position with the pancreatic duct. During the release process, the relative position of stent A and the pancreas is observed through the transparent sheath to ensure that their relative positions remain unchanged. The release is stopped when the oblique cut portion 121 at the tip of the sheath is withdrawn from the pancreatic duct. Additionally, barbs can be provided on the second stent body of the anastomotic stent A to help fix the second stent body to the pancreatic duct N.

[0072] Step 5: Please refer to Figure 10. Then push the jejunum M toward the pancreas and further release it so that the anastomotic stent A is fully released in the jejunum. At this time, it should be noted that the anastomotic stent A has a jejunal end with a large cross-sectional size and a pancreatic duct end with a small cross-sectional size. After the anastomotic stent A is fully released, it is necessary to ensure that the jejunal end of the anastomotic stent A is in the jejunum M and the pancreatic duct end of the anastomotic stent A is located in the pancreatic duct N.

[0073] Step 6: Remove the sheath 120 and inner tube 110, and use sutures to suture the jejunum M to the pancreas, completing the anastomosis of the jejunum and pancreatic duct.

[0074] Please refer to Figures 3, 11, and 12. Figure 11 is a schematic diagram of the conveyor shown in Figure 1 releasing the anastomosis stent; Figure 12 is a partial enlarged view of the conveyor shown in Figure 11 in region II.

[0075] It is worth noting that the vertebral opening at the tip of the sheath 120 is smaller than that of the anastomotic stent A. When the anastomotic stent A is released, it can expand the vertebral opening at the tip of the sheath 120, causing the heat-sealing tube to open under pressure, thus allowing the anastomotic stent A to be released smoothly. At this time, the vertebral opening at the tip of the sheath 120 expands into a funnel-shaped opening B under pressure. After the anastomotic stent A is released, the heat-sealing tube returns to its original shape, causing the funnel-shaped opening B at the tip of the sheath 120 to return to a shape approximating a vertebral body. In this design, it is convenient to insert the sheath 120 into the puncture head 131 during assembly, and it is also convenient to insert the sheath 120 into the pancreatic duct after removing the puncture head 131. Furthermore, setting the tip of the sheath 120 to be vertebral in shape can prevent the anastomotic stent A from detaching after removing the puncture head 131.

[0076] Please refer to Figure 13, which is a structural schematic diagram of an embodiment of an anastomotic stent provided in this application.

[0077] In this embodiment, the anastomosis stent A includes a braided stent 102 and a film 103 covering the braided stent 102. The braided stent 102 can be formed by braiding metal wires. Therefore, the opening at one end of the braided stent 102 is used for bending the metal wires to form multiple grooves 104, and the multiple grooves 104 are arranged in a serrated shape along the end of the braided stent 102.

[0078] The braided stent 102 can be formed by braiding nickel-titanium wire and then heat-setting. The braided stent 102 has a first stent tube 1021 and a second stent tube 1022, which are connected to each other. The diameter of the first stent tube 1021 is larger than the diameter of the second stent tube 1022. The first stent tube 1021 corresponds to the jejunal end, and the second stent tube 1022 corresponds to the pancreatic duct end.

[0079] In this design, the opening of the first stent tube 1021 on the side opposite to the second stent tube 1022 is serrated due to the bending of the nickel-titanium wire. The edge shape of the membrane 103 matches multiple grooves 104. Specifically, the membrane 103 is cut into a serrated (or wavy) shape at the opening of the first stent tube 1021 opposite to the second stent tube 1022 to match the opening at one end of the braided stent 102. This design reduces the occurrence of wrinkles in the membrane 103 at the opening of the first stent tube 1021, and even the problem of the membrane 103 detaching from the opening of the first stent tube 1021, thus improving the stability of the anastomotic stent A. It also facilitates better adhesion of the membrane 103 to the walls of the intestinal and pancreatic ducts, preventing leakage.

[0080] The first support tube 1021 has an arc-shaped outline. Specifically, the outline of the first support tube 1021 can be spherical or ellipsoidal, while the second support tube 1022 is a straight tube, and the connection between the first support tube 1021 and the second support tube 1022 is smooth.

[0081] The distance D between the edge of the film 103 and the braided filament must be set to no more than 1.4 mm. The distance D between the edge of the film 103 and the braided filament can be set to 1 mm, 1.2 mm or 1.4 mm.

[0082] In some other embodiments, the edge of the film 103 may also be configured not to extend beyond the edge of the braided support 102. Please refer to FIG14, which is a structural schematic diagram of another embodiment of an anastomotic support provided in this application.

[0083] The difference between the anastomotic stent in this embodiment and the anastomotic stent A in the previous embodiment is that the edge of the film 103 of the anastomotic stent in this embodiment does not extend beyond the edge of the braided stent 102, and the distance L2 between the edge of the film 103 and the edge of the braided stent 102 is not less than 4 mm. Furthermore, the film 103 extends from the first stent tube 1021 to the second stent tube 1022, and the length L3 of the film 103 is not less than 10 mm. In some specific embodiments, the size of L2 can be set to 4-7 mm, for example, 4, 5, 6, or 7 mm; the size of L3 can be set to 10-14 mm, for example, 10, 11, 12, 13, or 14 mm. One application scenario of this embodiment is that the film 103 is a silicone film. By setting the edge of the film 103 to not extend beyond the edge of the braided stent 102, the problem of the film 103 easily adhering and adsorbing when the anastomotic stent is compressed in the delivery device, thus preventing the anastomotic stent from expanding after release, can be prevented.

[0084] In some optional embodiments, the sheath 120 is made of a transparent polymer material and is marked with an identifier that corresponds to the position of the junction of the first stent tube 1021 and the second stent tube 1022 after the anastomotic stent A is assembled into the delivery device 10.

[0085] The markings on the sheath 120 indicate the length of the sheath inserted into the pancreatic duct. The anastomotic stent A can be released when the markings on the sheath 120 are flush with the cut end of the pancreatic duct. The relative movement of the anastomotic stent A during release can be observed through the sheath 120. The barbed structure on the second stent body 1022 of the anastomotic stent A prevents accidental dislodgement, and the self-expanding property of the anastomotic stent A ensures complete adhesion to the inner wall of the pancreatic duct. After the first body 1021 of the anastomotic stent A is released, the intestinal tract is pushed towards the pancreatic duct, eliminating the need for suturing between the pancreatic duct and jejunum. The membrane 103 of the anastomotic stent A prevents pancreatic juice leakage from the anastomotic stent A.

[0086] In summary, this application provides a stent and its delivery device for pancreaticojejunostomy. The delivery device provided by this application secures the puncture head to the tip of the sheath by tightening a fixing rope, ensuring the stability of the puncture head during tissue puncture. After puncture, the fixing rope can be loosened to detach the puncture head from the sheath, allowing the surgeon to remove it using forceps or other instruments without interfering with the release of the anastomotic stent. Furthermore, during assembly, the tip of the sheath is at least partially inserted into the puncture head, thereby improving the stability of the puncture head during tissue puncture. The above embodiments are merely illustrative examples of the invention and not all embodiments. The invention may also be implemented in other specific ways or forms without departing from the spirit or essential characteristics of the invention. Therefore, the described embodiments should be considered illustrative rather than limiting in any respect. The scope of the invention should be defined by the appended claims, and any variations equivalent to the intent and scope of the claims should also be included within the scope of the invention.

Claims

1. A delivery device for anastomotic stents, characterized in that, The conveyor includes: The inner tube, sheath, and puncture assembly are coaxially arranged; the inner tube is hollow; the sheath is sleeved on the inner tube and is movable along the axial direction of the inner tube; the anastomosis stent is sleeved on the inner tube and located in the gap between the inner tube and the sheath, and at least a portion of the anastomosis stent is exposed by the movement of the sheath along the axis. The puncture assembly includes a puncture head and a fixing rope, one end of which is connected to the puncture head via a channel in the inner tube. During assembly, the puncture head is fixed to the head end of the sheath by the fixing rope.

2. The conveyor as claimed in claim 1, characterized in that, When the puncture assembly is assembled, the tip of the sheath is at least partially inserted into the puncture head.

3. The conveyor as described in claim 2, characterized in that, The cross-sectional dimensions of the sheath gradually decrease at its tip in the direction toward the puncture head.

4. The conveyor as described in claim 3, characterized in that, The sheath has multiple incisions on the wall surrounding it at its tip. These incisions are evenly distributed around the circumference of the sheath, and the width of each incision gradually increases in the direction toward the puncture head. The sheath has an elastic sleeve at its head end, and the multiple cuts of the elastic sleeve converge to make the head end of the sheath shaped like a cone or approximately like a cone.

5. The conveyor as described in claim 3, characterized in that, The sheath has a beveled end, and the cut surface of the beveled end is inclined to the axial direction of the sheath.

6. The conveyor as claimed in claim 5, characterized in that, The tail end of the puncture head has an installation channel, and the head end of the puncture head is a pointed tip for puncturing tissue; one end of the fixing rope is fixedly connected to the installation channel. The oblique cut portion is at least partially inserted into the installation channel.

7. The conveyor as described in any one of claims 1-6, characterized in that, The conveyor also includes a first connector, which is fixedly sleeved on the sheath. By applying force to the first connector, the sheath can move axially.

8. The conveyor as claimed in claim 7, characterized in that, The delivery device also includes a thrust tube; the thrust tube is sleeved on the inner tube; the thrust tube is used to push against the anastomosis stent to prevent the anastomosis stent from moving synchronously when the sheath moves axially.

9. The conveyor as claimed in claim 7, characterized in that, The conveyor also includes a second connector, which is fixedly connected to the inner tube. By applying force to the second connector, the inner tube can move axially.

10. The conveyor as claimed in claim 7, characterized in that, A stepped groove is formed on the outer edge of the puncture head.

11. The conveyor as claimed in claim 1, characterized in that, The sheath is made of a transparent material so that the anastomotic stent can be viewed through the sheath.

12. An anastomotic stent, the anastomotic stent being disposed in the delivery device as described in any one of claims 1-11 and delivered by the delivery device to a designated tissue, characterized in that, The anastomotic stent includes: Braided support and a film covering the braided support; The opening at one end of the braided support forms multiple grooves by bending the braided yarns, and the multiple grooves are arranged in a serrated shape along the end of the braided support. The edge shape of the film matches the multiple grooves.

13. The anastomotic stent as described in claim 12, characterized in that, The braided support has a first support tube and a second support tube, which are connected together, wherein the diameter of the first support tube is larger than the diameter of the second support tube. The film extends from the first support tube to the second support tube.

14. The anastomotic stent as described in claim 13, characterized in that, The outer contour of the first support tube is spherical or ellipsoidal.

15. The anastomotic stent as described in claim 13, characterized in that, The distance D from the edge of the film to the edge of the braided support does not exceed 1.4 mm.

16. The anastomotic stent as described in claim 13, characterized in that, The edge of the film does not extend beyond the edge of the braided bracket, and the distance L2 between the edge of the film and the edge of the braided bracket is not less than 4 mm, and the length L3 of the film is not less than 10 mm.

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