Anastomosis stent and conveyor thereof

Abstract

The invention discloses an anastomosis stent and a conveyor thereof. The conveyor comprises an inner tube, a sheath tube and a puncture assembly which are coaxially arranged. The inner pipe is of a hollow structure; the sheath tube is arranged on the inner tube in a sleeving mode and can move in the axial direction of the inner tube. The anastomosis stent is arranged in the inner tube in a sleeving mode and located in a gap between the inner tube and the sheath tube, and at least part of the anastomosis stent is exposed through movement of the sheath tube along the axis; the puncture assembly comprises a puncture head and a fixing rope, and one end of the fixing rope is connected with the puncture head through a channel of the inner tube. When the puncture assembly is assembled, the puncture head is tensioned through the fixing rope and fixed to the head end of the sheath tube. By adopting the conveyor, the interference of the puncture head on the release of the anastomosis stent can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an anastomotic stent and a conveyor thereof. Background Art

[0002] Pancreatic fistula is the most serious complication after pancreatic resection. Pancreatic surgeons have been working hard to reduce the risk of pancreatic fistula through technical improvements or drug treatment, but even in large pancreatic surgical centers, the incidence of pancreatic fistula after pancreatic resection is still as high as 3-45%. Pancreatic fistula, especially in patients who have undergone pancreaticojejunostomy, is the most important risk factor for poor prognosis. Pancreatic fistula can cause intraperitoneal fluid accumulation, delayed gastric emptying, abdominal infection, bleeding, reoperation and even death of the patient.

[0003] Although it has been clarified that there are multiple risk factors for the occurrence of pancreatic fistula, including a soft pancreas, a small main pancreatic duct, and a posterior pancreatic duct, the only factor that surgeons can control is the pancreaticojejunal anastomosis technique. Currently, although various pancreaticojejunal anastomosis methods are different, the basic concept is mostly based on the direct anastomosis of the pancreatic duct and the jejunal mucosa, and a polymer material stent is fixed between the pancreatic duct-jejunal mucosa anastomosis to support the anastomosis and drain pancreatic juice.

[0004] In the existing scheme, it is necessary to first make a hole in the intestine, then insert a polymer stent into the pancreatic duct, and finally suture the pancreatic duct and jejunal mucosa. This method has problems such as the inconsistency between the diameter of the polymer stent and the inner diameter of the pancreatic duct, resulting in poor matching, poor matching between the intestinal duct opening and the inner diameter of the pancreatic duct, difficulty in anastomosis between the pancreatic duct and the jejunal mucosa, and a large physical gap at the anastomosis between the pancreatic duct and the jejunal mucosa, which can lead to the occurrence of pancreatic fistula. In addition, the inner diameter of the polymer stent is small, and the risk of long-term blockage is high, which can easily lead to stenosis of the pancreaticojejunal anastomosis and repeated attacks of pancreatitis.

[0005] In addition, in the existing scheme, a puncture needle is usually used to puncture the jejunum and enter the pancreatic duct, and then the stent is released, and the pancreatic duct and jejunal mucosa are directly anastomosed. However, in this scheme, the puncture head 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] In order to solve the defects of the prior art, the object of the present invention is to provide an anastomotic stent and a conveyor thereof, which can prevent the puncture head from interfering with the release of the anastomotic stent.

[0007] In order to achieve the above object, a technical solution adopted by the present invention is to provide an anastomotic stent and a conveyor thereof, wherein the conveyor comprises:

[0008] An inner tube, a sheath tube and a puncture assembly are coaxially arranged; the inner tube is a hollow structure; the sheath tube is sleeved on the inner tube and can move axially along the inner tube; the anastomotic stent is sleeved on the inner tube and is located in the gap between the inner tube and the sheath tube, and at least part of the anastomotic stent is exposed by the movement of the sheath tube along the axis;

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

[0010] Wherein, when the puncture assembly is assembled, the puncture head is fixed to the head end of the sheath tube by tightening the fixing rope.

[0011] Optionally, when the puncture assembly is assembled, the head end of the sheath is at least partially inserted into the puncture head.

[0012] Optionally, the cross-sectional size of the head end of the sheath tube gradually decreases in the direction toward the puncture head.

[0013] Optionally, the head end of the sheath tube is provided with a plurality of incisions on the tube wall surrounding the sheath tube, the plurality of incisions are evenly distributed along the circumferential direction of the sheath tube, and the width of each incision gradually increases in the direction toward the puncture head;

[0014] Wherein, the head end of the sheath tube is sleeved with an elastic sleeve, and a plurality of incisions of the elastic sleeve are gathered together so that the head end of the sheath tube is vertebral or approximately vertebral.

[0015] Optionally, the head end of the sheath tube has a beveled portion, and a cutting surface of the beveled portion is inclined with respect to an axial direction of the sheath tube.

[0016] Optionally, the tail end of the puncture head has a mounting 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 mounting channel;

[0017] The chamfered portion is at least partially inserted into the mounting channel.

[0018] Optionally, the conveyor further comprises a first joint, wherein the first joint is fixedly sleeved on the sheath tube, and the sheath tube can be axially moved by applying force on the first joint.

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

[0020] Optionally, the conveyor further comprises a second joint, wherein the second joint is fixedly connected to the inner tube, and the inner tube can move axially by applying force to the second joint.

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

[0022] In order to achieve the above object, a technical solution adopted by the present invention is to provide an anastomotic stent, which is used to be arranged in the conveyor as described above and transported to a set tissue through the conveyor, and the anastomotic stent includes:

[0023] A braided stent and a film covering the braided stent;

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

[0025] Optionally, the braided stent comprises a first stent tube body and a second stent tube body, the first stent tube body and the second stent tube body are connected, wherein the diameter of the first stent tube body is greater than the diameter of the second stent tube body;

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

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

[0028] Optionally, the distance D of the edge of the film beyond the edge of the braided stent does not exceed 1.4 mm.

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

[0030] The present invention provides an anastomotic stent and a conveyor thereof. By tightening a fixing rope to fix a puncture head to the head end of a sheath tube, the stability of the puncture head can be ensured when the puncture head punctures tissues; and after the puncture is completed, the fixing rope can be loosened to separate the puncture head from the sheath tube. At this time, the surgeon can use forceps and other instruments to remove the puncture head to avoid interference with the release of the anastomotic stent. In addition, when the puncture assembly is assembled, the head end of the sheath tube is at least partially inserted into the puncture head, thereby improving the stability of the puncture head when the puncture head punctures tissues. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1It is a structural schematic diagram of an embodiment of a conveyor provided by the present application;

[0032] Figure 2 yes Figure 1 A partial enlarged view of the conveyor in area II is shown;

[0033] Figure 3 yes Figure 1 A schematic diagram of the manufacturing process of the sheath tube in the delivery device shown;

[0034] Figure 4 yes Figure 1 A schematic diagram of the structure of the puncture assembly in the conveyor shown;

[0035] Figure 5 yes Figure 1 A schematic structural diagram of the puncture assembly in the conveyor during assembly;

[0036] Figure 6-Figure 10 It is a schematic diagram of the use process of an embodiment of a conveyor provided by the present application;

[0037] Fig.11 yes Figure 1 A schematic diagram of the delivery device is shown when releasing the anastomotic stent;

[0038] Fig.12 yes Fig.11 A partial enlarged view of the conveyor in area II is shown;

[0039] Fig.13 It is a structural schematic diagram of an embodiment of an anastomotic stent provided by the present application;

[0040] Fig.14 It is a structural schematic diagram of another embodiment of an anastomotic stent provided in the present application. DETAILED DESCRIPTION

[0041] 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.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0046] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0047] See also Figure 1-Figure 2 , Figure 1 It is a structural schematic diagram of an embodiment of a conveyor provided by the present application; Figure 2 yes Figure 1 A partial enlarged view of the conveyor in area II is shown.

[0048] The present application provides a conveyor 10 for anastomotic stents, the conveyor 10 comprising:

[0049] The inner tube 110, the sheath tube 120 and the puncture assembly 130 are coaxially arranged; the inner tube 110 is a hollow structure; the sheath tube 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 tube 120, and at least part of the anastomotic stent A is exposed by the movement of the sheath tube 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 via the channel of the inner tube 110; wherein, when the puncture assembly 130 is assembled, the puncture head 131 is fixed to the head end of the sheath tube 120 by tightening the fixing rope 132.

[0051] Therefore, by tightening the fixing rope 132 to fix the puncture head 131 to the head end of the sheath 120, the stability of the puncture head 131 can be ensured when the puncture head 131 punctures the tissue; and after the puncture is completed, the fixing rope 132 can be loosened to separate the puncture head 131 from the sheath 120. At this time, the surgeon can use instruments such as tweezers to remove the puncture head 131 to avoid interfering with the release of the anastomosis stent.

[0052] Furthermore, in this embodiment, when the puncture assembly 130 is assembled, the head end of the sheath 120 is at least partially inserted into the puncture head 131, so that the stability of the puncture head 131 can be improved when the puncture head 131 punctures tissue.

[0053] Optionally, the cross-sectional size of the head end of the sheath tube 120 gradually decreases in the direction toward the puncture head 131. The advantage of this solution is that it is easy to insert the sheath tube 120 into the puncture head 131, and it is easy to form a whole with the puncture head 131 for intestinal puncture; and after the puncture head 131 is removed, it is also easier to insert the sheath tube 120 into the pancreatic duct, reducing the risk of damage to the pancreatic duct.

[0054] Optionally, the tip end of the sheath tube 120 has a beveled portion 121 , and a cutting surface 1211 of the beveled portion 121 is inclined with respect to the axial direction of the sheath tube 120 .

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

[0056] For details, please refer to Figure 3 . Figure 3 yes Figure 1 Schematic diagram of the manufacturing process of the sheath tube in the delivery device shown.

[0057] The head end of the sheath tube 120 is provided with a plurality of incisions 122 on the tube wall surrounding the sheath tube, and the plurality of incisions 122 are evenly distributed along the circumferential direction of the sheath tube 120, and the width of each incision 122 gradually increases in the direction toward the puncture head 131; wherein, the head end of the sheath tube 120 is provided with an elastic sleeve 123, and the elastic sleeve 123 brings the plurality of incisions 122 together so that the head end of the sheath tube 120 is conical or approximately conical.

[0058] The cutout 122 may be a triangular cutout 122. The elastic sleeve 123 may be formed by heat shrinking a heat-sealing tube. By putting the heat-sealing tube on the head end area of ​​the sheath tube 120 and heating it, the heat-sealing tube may be shrunk, so that the multiple cutouts 122 at the head end of the sheath tube 120 are closed, so that the head end of the sheath tube 120 forms a vertebra or a near vertebra. Then, an oblique cut is made at the position of the vertebra, so that the oblique cut portion 121 as described above may be formed.

[0059] For further information, see Figure 4-Figure 5 . Figure 4 yes Figure 1 A schematic diagram of the structure of the puncture assembly in the conveyor shown; Figure 5 yes Figure 1 A schematic structural diagram of the puncture assembly in the conveyor is shown.

[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 bevel portion 121 is at least partially inserted into the installation channel 1311.

[0061] The outer surface of the puncture head 131 is also provided with a step groove 1312. The step groove 1312 can be easily clamped by a device such as tweezers to remove the puncture head 131.

[0062] Optionally, the conveyor 10 further includes a first joint 140 , which is fixedly sleeved on the sheath tube 120 , and the sheath tube 120 can move axially by applying force on the first joint 140 .

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

[0064] Optionally, the conveyor 10 further includes a second joint 160 , which is fixedly sleeved on the inner tube 110 , and the inner tube 110 can move axially by applying force on the second joint 160 .

[0065] A specific implementation scenario of an anastomotic stent and a conveyor thereof provided in the present application is as follows:

[0066] In this implementation scenario, the delivery device 10 can be used for pancreaticojejunal anastomosis.

[0067] See also Figure 6-Figure 10 . Figure 6-Figure 10 1 is a schematic diagram of the use process of an embodiment of the conveyor provided by the present application, wherein the anastomotic stent A is sleeved on the outer layer of the inner tube 110 ; the anastomotic stent A is accommodated in the sheath tube 120 .

[0068] Step 1: Please refer to Figure 6-Figure 7 The puncture needle 131 punctures the jejunum M at the predetermined puncture entry position a and exits from the predetermined puncture exit position b. Point a is the predetermined position for bile-jejunostomy, and point b is the predetermined position for pancreaticojejunostomy.

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

[0070] Step 3: Please refer to Figure 8 After the puncture needle 131 is removed, the opening of the head end of the sheath tube 120 may be exposed, and the head end of the sheath tube 120 may be partially inserted into the pancreatic duct N of the pancreas; it should be noted that the pancreas has been partially removed, so the pancreatic duct N is exposed to the outside, and the head end of the sheath tube 120 may be inserted into the pancreatic duct N along the exposed opening. The depth of insertion is the mark on the transparent sheath tube, and at this time, the second stent tube body of the stent is located in the pancreatic duct, and the first stent tube body is located outside the pancreatic duct.

[0071] Step 4: Please refer to Fig. 9 , and then the sheath 120 is moved axially backward, during which the anastomotic stent A can be gradually released from the sheath 120; and, after the anastomotic stent A is released from the sheath 120, it expands to fit the inner wall of the pancreatic duct and is fixed in position with the pancreatic duct. During the release process, the relative position of the stent A and the pancreas is observed through the transparent sheath to ensure that the relative positions of the two remain unchanged. The release is stopped when the beveled portion 121 at the head end of the sheath is withdrawn from the pancreatic duct. Among them, the second stent tube body of the anastomotic stent A can also be provided with barbs to cooperate in fixing the second stent tube body to the pancreatic duct N.

[0072] Step 5: Please refer to Fig.10 , and then push the jejunum M toward the pancreas, and further release it so that the anastomosis stent A is released in the jejunum part; it should be noted at this time that the anastomosis stent A has a jejunum end with a large cross-sectional size and a pancreatic duct end with a small cross-sectional size. When the anastomosis stent A is completely released, it is necessary to ensure that the jejunum end of the anastomosis stent A is in the jejunum M, and the pancreatic duct end of the anastomosis stent A is in the pancreatic duct N.

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

[0074] Among them, see Figure 3 , Fig.11 and Fig.12 .in, Fig.11 yes Figure 1 A schematic diagram of the delivery device is shown when releasing the anastomotic stent; Fig.12 yes Fig.11 A partial enlarged view of the conveyor in area II is shown.

[0075] It is worth noting that the vertebral opening size at the head end of the sheath 120 is smaller than the anastomosis bracket A. When the anastomosis bracket A is released, the vertebral body at the head end of the sheath 120 can be stretched open, so that the heat-sealed tube is squeezed and opened, and the anastomosis bracket A can be released smoothly. At this time, the vertebral body at the head end of the sheath 120 is squeezed and expanded into a trumpet mouth B. After the release of the anastomosis bracket A is completed, the heat-sealed tube is restored, so that the trumpet mouth B at the head end of the sheath 120 is restored to a shape similar to the vertebral body. In this scheme, 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 the puncture head 131 is removed. Moreover, the head end of the sheath 120 is set to a vertebral shape, which can prevent the anastomosis bracket A from detaching after the puncture head 131 is removed.

[0076] See also Fig.13 ,in Fig.13 It is a structural schematic diagram of an embodiment of an anastomotic stent provided in the present application.

[0077] In this embodiment, the anastomosis bracket A includes a woven bracket 102 and a film 103 covering the woven bracket 102, wherein the woven bracket 102 can be formed by weaving metal wires. Therefore, the opening at one end of the woven bracket 102 is used for bending the metal wires to form a plurality of grooves 104, and the plurality of grooves 104 are arranged in a zigzag shape along the end of the woven bracket 102.

[0078] Among them, the braided stent 102 can be formed by braiding nickel-titanium wire and then through processes such as heat setting. The braided stent 102 has a first stent tube body 1021 and a second stent tube body 1022. The first stent tube body 1021 and the second stent tube body 1022 are connected, wherein the diameter of the first stent tube body 1021 is greater than the diameter of the second stent tube body 1022. The first stent tube body 1021 corresponds to the jejunal end, and the second stent tube body 1022 corresponds to the pancreatic duct end.

[0079] Among them, the opening position of the first stent tube body 1021 away from the second stent tube body 1022 is woven into a zigzag shape due to the bending of the nickel-titanium wire. The edge shape of the film 103 matches the multiple grooves 104. Specifically, the film 103 is cut into a zigzag shape (or wavy shape) that matches the opening at one end of the braided stent 102 by forming the opening of the first stent tube body 1021 away from the second stent tube body 1022. This solution can reduce the problem of wrinkles on the film 103 at the opening of the first stent tube body 1021, and even the problem of the film 103 at the opening of the first stent tube body 1021 detaching, and can improve the stability of the anastomotic stent A. And it can be more conducive to the film 103 to fit the walls of the intestinal duct and pancreatic duct to avoid leakage.

[0080] The outer contour of the first bracket tube body 1021 is an arc shape. Specifically, the outer contour of the first bracket tube body 1021 can be spherical or ellipsoidal, while the second bracket tube body 1022 is a straight tube, and the connection between the first bracket tube body 1021 and the second bracket tube body 1022 is a smooth transition.

[0081] The distance D between the edge of the film 103 and the braided wire needs to be set to not exceed 1.4 mm, and the distance D between the edge of the film 103 and the braided wire 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 set so as not to exceed the edge of the braided stent 102. Fig.14 , Fig.14 It is a structural schematic diagram of another embodiment of an anastomotic stent provided in the present application.

[0083] Among them, 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 exceed 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 4mm, and 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 10mm. In some specific embodiments, the size of L2 can be set to 4-7mm, for example, the size of L2 can be 4, 5, 6 or 7 mm; the size of L3 can be set to 10-14mm, for example, the size of L3 can be 10, 11, 12, 13 or 14 mm. An application scenario of this embodiment is that the film 103 is a silicone film. By setting the edge of the film 103 not to exceed the edge of the braided stent 102, it can be prevented that the film 103 is easy to adhere and adsorb when the anastomotic stent is compressed in the conveyor, thereby causing the anastomotic stent to not expand after release.

[0084] Among them, in some optional embodiments, the sheath 120 is made of a transparent polymer material, and a mark is set on the sheath 120, which can be set corresponding to the position of the junction between the first stent tube body 1021 and the second stent tube body 1022 after the anastomosis stent A is assembled into the conveyor 10.

[0085] The mark on the sheath 120 can determine the length of the sheath extending into the pancreatic duct. When the sheath 120 extends into the pancreatic duct until the mark is flush with the broken end of the pancreatic duct, the anastomosis bracket A can be released. Through the sheath 120, it can be observed whether the anastomosis bracket A moves relative to each other during the release process. The barb structure on the second bracket tube body 1022 of the anastomosis bracket A can prevent the anastomosis bracket A from accidentally falling out, and the self-expansion property of the anastomosis bracket A can ensure complete fit with the inner wall of the pancreatic duct. After the first tube body 1021 of the anastomosis bracket A is released, the intestinal duct is pushed toward the pancreatic duct, eliminating the suturing process of the pancreatic duct and the jejunum. The film 103 of the anastomosis bracket A can prevent pancreatic fluid from leaking from the anastomosis bracket A.

[0086] In summary, the present application provides a stent for pancreaticojejunal anastomosis and a conveyor thereof. The conveyor provided by the present application can ensure the stability of the puncture head when the puncture head punctures the tissue by tightening the fixing rope to fix the puncture head to the head end of the sheath; and after the puncture is completed, the fixing rope can be loosened to separate the puncture head from the sheath. At this time, the surgeon can use forceps and other instruments to remove the puncture head to avoid interference with the release of the anastomosis stent. In addition, when the puncture assembly is assembled, the head end of the sheath is at least partially inserted into the puncture head, so that the stability of the puncture head can be improved when the puncture head punctures the tissue. The above embodiments are only examples of the present invention, not all embodiments. The present invention can also be implemented in other specific ways or other specific forms without departing from the gist or essential features of the present invention. Therefore, the described embodiments should be regarded as illustrative rather than restrictive in any respect. The scope of the present invention should be described by the attached claims, and any changes equivalent to the intent and scope of the claims should also be included in the scope of the present invention.

Claims

1. A conveyor for anastomotic stents, characterized in that: The conveyor comprises: An inner tube, a sheath tube and a puncture assembly are coaxially arranged; the inner tube is a hollow structure; the sheath tube is sleeved on the inner tube and can move axially along the inner tube; the anastomotic stent is sleeved on the inner tube and is located in the gap between the inner tube and the sheath tube, and at least part of the anastomotic stent is exposed by the movement of the sheath tube along the axis; The puncture assembly includes a puncture head and a fixing rope, one end of the fixing rope is connected to the puncture head via the channel of the inner tube; Wherein, when the puncture assembly is assembled, the puncture head is fixed to the head end of the sheath tube by tightening the fixing rope.

2. The conveyor according to claim 1, characterized in that When the puncture assembly is assembled, the head end of the sheath tube is at least partially inserted into the puncture head.

3. The conveyor according to claim 2, characterized in that The cross-sectional size of the head end of the sheath tube gradually decreases in the direction toward the puncture head.

4. The conveyor according to claim 3, characterized in that The head end of the sheath tube is provided with a plurality of incisions on the tube wall surrounding the sheath tube, the plurality of incisions are evenly distributed along the circumferential direction of the sheath tube, and the width of each incision gradually increases in the direction toward the puncture head; Wherein, the head end of the sheath tube is sleeved with an elastic sleeve, and a plurality of incisions of the elastic sleeve are gathered together so that the head end of the sheath tube is vertebral or approximately vertebral.

5. The conveyor according to claim 3, characterized in that The head end of the sheath tube has a beveled portion, and the cutting surface of the beveled portion is inclined with respect to the axial direction of the sheath tube.

6. The conveyor according to claim 5, characterized in that The tail end of the puncture head has a mounting channel, and the head end of the puncture head is a pointed end for puncturing tissue; one end of the fixing rope is fixedly connected to the mounting channel; The chamfered portion is at least partially inserted into the mounting channel.

7. The conveyor according to any one of claims 1 to 6, characterized in that: The conveyor further comprises a first joint, which is fixedly sleeved on the sheath tube, and the sheath tube can be axially moved by applying force on the first joint.

8. The conveyor according to claim 7, characterized in that The conveyor further comprises a thrust tube; the thrust tube is sleeved on the inner tube; the thrust tube is used to push the anastomotic stent to prevent the anastomotic stent from being driven to move synchronously when the sheath tube moves axially.

9. The conveyor according to claim 7, characterized in that The conveyor further comprises a second joint, wherein the second joint is fixedly connected to the inner tube, and the inner tube can be axially moved by applying force to the second joint.

10. The conveyor according to claim 7, characterized in that A step groove is formed on the outer side of the puncture head.

11. The conveyor according to claim 1, characterized in that The sheath tube is made of a transparent material so that the anastomotic stent can be observed through the sheath tube.

12. An anastomotic stent, the anastomotic stent is used to be arranged in the conveyor according to any one of claims 1 to 11, and is conveyed to a set tissue through the conveyor, characterized in that: The anastomotic stent comprises: A braided stent and a film covering the braided stent; The opening at one end of the braided support forms a plurality of grooves by bending the braided wires, and the plurality of grooves are arranged in a zigzag shape along the end of the braided support, and the edge shape of the film matches the plurality of grooves.

13. The anastomotic stent according to claim 12, characterized in that: The braided stent comprises a first stent tube body and a second stent tube body, the first stent tube body and the second stent tube body are connected, wherein the diameter of the first stent tube body is greater than the diameter of the second stent tube body; The film extends from the first stent tube to the second stent tube.

14. The anastomotic stent according to claim 13, characterized in that: The outer contour of the first stent tube body is spherical or ellipsoidal.

15. The anastomotic stent according to claim 13, characterized in that: The distance D between the edge of the film and the edge of the braided support does not exceed 1.4 mm.

16. The anastomotic stent according to claim 13, characterized in that: The edge of the film does not exceed the edge of the woven support, and the distance L2 between the edge of the film and the edge of the woven support is not less than 4 mm, and the length dimension L3 of the film is not less than 10 mm.

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