Anti-fistula type stapler

Abstract

This invention provides a fistula-preventing tube-type stapler, relating to the field of medical device technology. The fistula-preventing tube-type stapler includes an anastomosis mechanism, an anastomosis mechanism, and a fistula-preventing stent. The anastomosis component in the anastomosis mechanism is disposed within the stapler body, and a guide shaft is movably disposed within the stapler body. In the anastomosis mechanism, a sealing element is disposed at the distal end of the loading sleeve, and a pushing component is disposed at the proximal end of the loading sleeve and detachably connected to the guide shaft. The sealing element is connected to the pushing component. The fistula-preventing stent is disposed within the loading sleeve. Pushing the pushing component allows the fistula-preventing stent to be placed within the intestine. The cross-sectional area of ​​the distal end of the fistula-preventing stent is larger than the cross-sectional area of ​​the middle portion. After being placed within the intestine, the fistula-preventing stent has a constricted state and a fistula-preventing state. In the fistula-preventing state, the distal end of the stent abuts against the intestinal wall. Moving the pushing component switches the stent from the constricted state to the fistula-preventing state. This fistula-preventing tube-type stapler is simple to operate and can prevent the fistula-preventing stent from shifting within the intestine, ensuring the fistula-preventing effect and reducing foreign body sensation.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to an anti-fistula type anastomosis device. Background Technology

[0002] A tubular anastomosis device is used in gastrointestinal resection surgery to connect the two severed ends of the intestine. During anastomosis, the two segments of tissue are contained within the anastomosis device, and after firing, a circular anastomosis is formed in the tissue, thereby reconstructing the body passage. However, some patients still experience anastomotic leakage, anastomotic bleeding, and anastomotic stenosis after surgery, requiring repeat surgery and increasing the patient's economic and psychological burden.

[0003] In existing technologies, after the anastomosis is completed, a covered stent is usually placed in the intestine by a tubular stapler to form a channel for the flow of intestinal contents at the anastomosis site, thereby avoiding the above situation. However, the structure of existing tubular staplers for placing covered stents is usually quite complex, making the placement process cumbersome. Moreover, after the covered stent is placed in the intestine, it may shift with intestinal peristalsis, resulting in poor fistula prevention. If external instruments are used to position the covered stent, it will increase the patient's foreign body sensation. Summary of the Invention

[0004] The purpose of this invention is to provide a fistula-preventing stapling device. This fistula-preventing stapling device is simple to operate and can prevent the fistula-preventing stapling from shifting in the intestine, ensuring the fistula prevention effect and reducing the feeling of a foreign body.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Anti-leakage anastomosis device, used for postoperative colonic and rectal anastomosis, and capable of preventing leakage at the anastomosis site, including;

[0007] The anastomosis mechanism includes an anastomosis device body, an anastomosis cutting component, and a guide shaft. The anastomosis cutting component is disposed at the distal end of the anastomosis device body and is used to complete the anastomosis operation between the colon and the rectum. The guide shaft is movably disposed on the anastomosis device body and can extend out of the distal end of the anastomosis cutting component.

[0008] The anti-nail mechanism includes a pushing component, a loading sleeve, a sealing component, and a first connecting line. The sealing component is disposed at the distal end of the loading sleeve, the pushing component is disposed at the proximal end of the loading sleeve and is detachably connected to the guide shaft, and the sealing component is connected to the pushing component via the first connecting line.

[0009] An anti-fistula stent is disposed within the loading sleeve and located between the blocking member and the pushing assembly. The guide axis pushes the pushing assembly towards the distal end of the loading sleeve, enabling the anti-fistula stent to be placed inside the intestine. The anti-fistula stent is cylindrical and includes multiple alternating flexible support sections and rigid support sections along its axial direction. The distal end of the anti-fistula stent is configured as the rigid support section, and the cross-sectional area of ​​the distal end of the anti-fistula stent is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent.

[0010] The anti-fistula stent, after being placed in the intestine, has a constricted state and an anti-fistula state. When the anti-fistula stent is in the anti-fistula state, the distal end of the anti-fistula stent abuts against the inner wall of the intestine. The pushing component can move away from the distal end of the loading sleeve to switch the anti-fistula stent from the constricted state to the anti-fistula state.

[0011] As a further technical solution, the pinning mechanism also includes a second connecting line, which is connected between the proximal end of the sealing member and the anti-fistula bracket;

[0012] When the pushing component moves away from the distal end of the loading sleeve, the second connecting line can pull the sealing member out from the inside of the anti-fistula bracket to the proximal end of the loading sleeve, so that the anti-fistula bracket switches from the constricted state to the anti-fistula state, and the proximal end of the anti-fistula bracket extends to the proximal end of the rectum.

[0013] As a further technical solution, the proximal end of the anti-fistula stent is provided with a flexible rolled edge. When the proximal end of the anti-fistula stent extends to the proximal end of the rectum, the flexible rolled edge restricts the relative position of the anti-fistula stent from the proximal end of the rectum.

[0014] As a further technical solution, the anti-fistula stent is externally fitted with an absorbent element for absorbing tissue fluid, and when the anti-fistula stent is in the anti-fistula state, the absorbent element abuts against the inner wall of the intestine.

[0015] As a further technical solution, the anti-fistula stent is provided with a drainage tube inside, one end of which passes through the side wall of the anti-fistula stent and communicates with the absorbent, and the other end can extend out of the rectum.

[0016] As a further technical solution, the sealing element is configured as a sphere, and the outer peripheral wall of the loading sleeve is configured as a guide surface. From the far end to the near end of the loading sleeve, the guide surface is inclined in a direction away from the axis of the loading sleeve.

[0017] As a further technical solution, the pushing component includes an anvil and a pushing member;

[0018] The anvil includes an abutment plate and an auxiliary rod. The abutment plate is fixedly disposed at the distal end of the auxiliary rod and abuts against the proximal end of the loading sleeve. The auxiliary rod has a connecting channel extending axially in the middle.

[0019] The pushing component includes an auxiliary disk and a pushing rod. The auxiliary disk is fixedly disposed at the distal end of the pushing rod. The proximal end of the pushing rod is inserted into the connecting channel from the distal end of the connecting channel and extends out of the connecting channel. The guide shaft can push the pushing rod to move towards the distal end of the loading sleeve and can be detachably connected to the connecting channel.

[0020] As a further technical solution, the inner wall of the connecting channel is provided with a spring piece, and the side of the spring piece near the axis of the connecting channel is provided with a snap-fit ​​protrusion that can engage with the guide shaft.

[0021] As a further technical solution, the inner wall of the connecting channel is provided with a magnetic component, and the guide shaft is provided with an auxiliary component that can be magnetically connected to the magnetic component.

[0022] As a further technical solution, the anti-fistula type stapler also includes a connecting bracket, and the anvil mechanism can be constricted to the stapler mechanism through the connecting bracket.

[0023] Compared with the prior art, the anti-fistula tube type anastomosis device provided by the present invention has the following technical advantages:

[0024] 1. Because the anti-fistula stent includes multiple alternating flexible support sections and rigid support sections along its axial direction, the distal end of the anti-fistula stent is set as a rigid support section, and the cross-sectional area of ​​the distal end of the anti-fistula stent is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent; at the same time, the anti-fistula stent is set inside the loading cylinder and is located between the sealing component and the pushing component, and the pushing component can be detachably connected to the guide shaft. Therefore, when performing anastomosis sutures on the colon and rectum, the anvil mechanism equipped with the anti-fistula stent is first placed in the colon, and the pushing component is exposed at the proximal end of the colon. Then, the anastomosis device body is inserted into the rectum so that the anastomosis component is placed in the rectum. Next, the guide shaft is connected to the pushing component, and the guide shaft is pushed so that the pushing component pushes the anti-fistula stent into the colon. Then, the anastomosis component performs anastomosis sutures on the colon and rectum. Afterward, the guide shaft is pulled towards the distal end of the rectum, so that the occluding element passes through the middle of the anti-fistula stent through the pushing component and the first connecting line until the occluding element is pulled out from the proximal end of the anti-fistula stent, thereby switching the anti-fistula stent from the constricted state to the anti-fistula state to form a channel for the flow of intestinal contents in the intestine corresponding to the anastomosis. As the occluding element is pulled out from the proximal end of the anti-fistula stent, the anti-fistula stent is expanded and extended under the action of the occluding element, so that the outer wall of the anti-fistula stent adheres to the inner wall of the intestine and covers the anastomosis. Because the distal end of the anti-fistula stent is set as a rigid support part, and the cross-sectional area of ​​the distal end of the anti-fistula stent is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent, when the anti-fistula stent is expanded, the distal end of the anti-fistula stent abuts against the inner wall of the intestine. Thus, the anti-fistula stent can cooperate with the intestine and achieve positioning by means of its own structural characteristics, avoiding displacement of the anti-fistula stent with intestinal peristalsis. Moreover, the flexible support part can prevent the entire anti-fistula stent from completely abutting against and adhering to the inner wall of the intestine, thereby ensuring the anti-fistula effect while avoiding the need for external instruments to limit the anti-fistula stent, thereby reducing the patient's foreign body sensation.

[0025] 2. The anastomosis mechanism is simple in structure, consisting only of a pushing component, a loading sleeve, a sealing element, and a first connecting line. During the anastomosis of the colon and rectum, the anti-fistula stent is loaded into the loading sleeve, and the pushing component is connected to the guide shaft. By pushing the pushing component towards the distal end of the loading sleeve along the guide shaft, the loading stent is placed inside the intestine. Then, the pushing component is pulled away from the distal end of the loading sleeve, allowing the sealing element to pass through the middle of the anti-fistula stent. This causes the anti-fistula stent to open and extend, so that the outer wall of the anti-fistula stent adheres to the inner wall of the intestine and covers the anastomosis. The entire process ensures the anti-fistula effect, and due to the simple structure of the anastomosis mechanism, the operation is simple and convenient. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a cross-sectional view of the anti-fistula type anastomosis device provided in an embodiment of the present invention;

[0028] Figure 2 This is a cross-sectional view of the anti-fistula stent in the anti-fistula tube-type anastomosis device provided in an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram of the anvil seat in the anti-fistula type stapler provided in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the connecting bracket in the anti-fistula tube type anastomosis device provided in an embodiment of the present invention;

[0031] Figure 5 This is a cross-sectional view of the anvil mechanism of the anti-fistula tube-type stapler provided in this embodiment of the invention, with the anti-fistula stent mounted inside the intestine;

[0032] Figure 6 This is a cross-sectional view of the anvil mechanism in the anti-fistula tube-type stapler provided in this embodiment of the invention, in which the anti-fistula stent is loaded, pushes the anti-fistula stent into the intestine;

[0033] Figure 7 This is a cross-sectional view of the anti-fistula support and the anvil mechanism in the anti-fistula tube-type stapler provided in the embodiment of the present invention when the anti-fistula support is in the anti-fistula state.

[0034] In the picture:

[0035] 10. Colon; 20. Rectum;

[0036] 100. Anastomosis mechanism; 110. Anastomosis device body; 120. Anastomosis cutting assembly; 130. Guide shaft;

[0037] 200, Anchor mechanism; 210, Pushing assembly; 211, Anchor seat; 2111, Abutting plate; 2112, Auxiliary rod; 2113, Snap-fit ​​protrusion; 212, Pushing component; 2121, Auxiliary plate; 2122, Pushing rod; 220, Loading sleeve; 230, Sealing component; 240, First connecting line; 250, Second connecting line;

[0038] 300. Anti-fistula stent; 301. Flexible support part; 302. Rigid support part; 310. Flexible rolled edge; 320. Absorbent component;

[0039] 400. Connecting bracket; 410. First snap-fit ​​part; 420. Second snap-fit ​​part; 430. Connecting cover; 440. Handle. Detailed Implementation

[0040] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0041] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0042] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0043] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0044] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0045] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0046] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0047] Combination Figure 1 and Figure 7As shown, the anti-fistula tube-type stapler (hereinafter referred to as the stapler) provided in this embodiment is used for postoperative anastomosis of the colon 10 and rectum 20, and can prevent fistula at the anastomosis site. The anti-fistula tube-type stapler is easy to operate and can prevent the anti-fistula stent 300 from shifting in the intestine, ensuring the anti-fistula effect and reducing the feeling of foreign body. Specifically, the anti-fistula type stapler includes: a stapler body 110, a cutting assembly 120, and a guide shaft 130. The cutting assembly 120 is located at the distal end of the stapler body 110 and is used to complete the anastomosis of the colon 10 and the rectum 20. The guide shaft 130 is movably disposed on the stapler body 110 and can extend beyond the distal end of the cutting assembly 120; the anvil mechanism 200 includes a pushing assembly 210, a loading sleeve 220, a sealing member 230, and a first connecting line 240. The sealing member 230 is located at the distal end of the loading sleeve 220, and the pushing assembly 210 is located at the proximal end of the loading sleeve 220 and can be detachably connected to the guide shaft 130. 30. The sealing member 230 is connected to the pushing component 210 via the first connecting line 240. The anti-fistula stent 300 is disposed inside the loading sleeve 220 and located between the sealing member 230 and the pushing component 210. The guide shaft 130 pushes the pushing component 210 toward the distal end of the loading sleeve 220, so that the anti-fistula stent 300 can be placed in the intestine. The anti-fistula stent 300 is cylindrical and includes multiple alternating flexible support parts 301 and rigid support parts 302 along the axial direction of the anti-fistula stent 300. The distal end of the anti-fistula stent 300 is set as the rigid support part 302, and the cross-sectional area of ​​the distal end of the anti-fistula stent 300 is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent 300. The anti-fistula stent 300 has a contracted state and an anti-fistula state after being placed in the intestine. When the anti-fistula stent 300 is in the anti-fistula state, the distal end of the anti-fistula stent 300 abuts against the inner wall of the intestine and pulls the pushing component 210 away from the distal end of the loading sleeve 220 so that the anti-fistula stent 300 switches from the contracted state to the anti-fistula state.

[0048] Because the anti-fistula stent 300 includes multiple alternating flexible support portions 301 and rigid support portions 302 along its axial direction, the distal end of the anti-fistula stent 300 is set as the rigid support portion 302, and the cross-sectional area of ​​the distal end of the anti-fistula stent 300 is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent 300; at the same time, the anti-fistula stent 300 is disposed in the loading cylinder and located between the sealing member 230 and the pushing assembly 210, and the pushing assembly 210 can be detachably connected to the guide shaft 130. Thus, when performing anastomosis suture on the colon 10 and the rectum 20, firstly, the anvil mechanism 200 containing the anti-fistula stent 300 is placed in the colon 10, and the pushing assembly 210 is exposed at the proximal end of the colon 10, and then the stapler body 110 is inserted into the rectum 20 so that the anastomosis component 120 is placed in the rectum 20; secondly, the guide shaft 130 is connected to the pushing assembly 210, and the guide shaft 130 is pushed so that the pushing assembly 210 pushes the anti-fistula stent 300 into the colon 10. Then, the anastomosis assembly 120 anastomoses and sutures the colon 10 and rectum 20; subsequently, the guide shaft 130 is pulled toward the distal end of the rectum 20, thereby pushing the assembly 210 and the first connecting line 240 so that the occluding member 230 passes through the middle of the anti-fistula stent 300 until the occluding member 230 is pulled out from the proximal end of the anti-fistula stent 300, thereby switching the anti-fistula stent 300 from the constricted state to the anti-fistula state, so as to form a flow channel for the flow of intestinal contents in the intestine corresponding to the anastomosis. During the process of the occlusion member 230 being pulled out from the proximal end of the anti-fistula stent 300, the anti-fistula stent 300 is stretched and extended under the action of the occlusion member 230, so that the outer wall of the anti-fistula stent 300 fits against the inner wall of the intestine and covers the anastomosis. Since the distal end of the anti-fistula stent 300 is set as a rigid support part 302, and the cross-sectional area of ​​the distal end of the anti-fistula stent 300 is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent 300, when the anti-fistula stent 300 is stretched, the distal end of the anti-fistula stent 300 abuts against the inner wall of the intestine. Thus, the anti-fistula stent 300 can cooperate with the intestine and achieve positioning by means of its own structural characteristics, avoiding displacement of the anti-fistula stent 300 with intestinal peristalsis. In addition, the flexible support part 301 can prevent the anti-fistula stent 300 from completely abutting against and fitting against the inner wall of the intestine. This ensures the anti-fistula effect while avoiding the need for external instruments to limit the anti-fistula stent 300, thereby reducing the patient's foreign body sensation.

[0049] Since the anvil mechanism 200 consists only of a pushing component 210, a loading sleeve 220, a sealing component 230, and a first connecting line 240, its structure is simple. During the anastomosis suture of the colon 10 and rectum 20, the anti-fistula stent 300 is loaded into the loading sleeve 220, and the pushing component 210 is connected to the guide shaft 130. By pushing the pushing component 210 towards the distal end of the loading sleeve 220 through the guide shaft 130, the loading stent can be placed in the intestine. Then, the pushing component 210 is pulled away from the distal end of the loading sleeve 220 so that the sealing component 230 passes through the middle of the anti-fistula stent 300, which allows the anti-fistula stent 300 to be opened and extended, so that the outer wall of the anti-fistula stent 300 fits against the inner wall of the intestine and covers the anastomosis. The entire process ensures the anti-fistula effect, and because the anvil mechanism 200 has a simple structure, it is easy and convenient to operate.

[0050] In addition, in this embodiment, the inner wall of the anti-fistula stent 300 is covered with a membrane. Thus, the anti-fistula stent 300 is configured as a cylindrical structure consisting of multiple alternating flexible support sections 301 and rigid support sections 302. The rigid support sections 302 are made of tightly wound nickel-titanium alloy wire, and the flexible support sections 301 are made of tightly wound flexible wire. This allows the flexible support sections 301 to further prevent the membrane from adhering to the intestinal wall, thereby further reducing the foreign body sensation. It also facilitates the compression and loading of the anti-fistula stent 300 into the anvil mechanism 200. An anti-adhesion coating is applied to the inner side of the membrane to prevent intestinal contents from adhering to the anti-fistula stent 300 as they flow through the passageway, facilitating the passage of intestinal contents.

[0051] The middle and distal ends of the anti-fistula stent 300 are cylindrical. The cross-sectional shape of the rigid support portion 302 located at the distal end of the anti-fistula stent 300 is not specifically limited, as long as the cross-sectional area of ​​the rigid support portion 302 at the distal end of the anti-fistula stent 300 is larger than the cross-sectional area of ​​the middle part of the anti-fistula stent 300. In this embodiment, the rigid support portion 302 at the distal end of the anti-fistula stent 300 is cup-shaped. This design allows the occluding member 230 to enter the anti-fistula stent 300 from its distal end during the transition from the contracted state to the anti-fistula state. Furthermore, when the anti-fistula stent 300 is in the anti-fistula state, the outer peripheral wall of the rigid support portion 302 at the distal end of the anti-fistula stent 300 is completely in contact with the intestinal wall, ensuring the limiting effect on the anti-fistula stent 300.

[0052] Preferably, the anvil mechanism 200 further includes a second connecting line 250, which connects the sealing member 230 and the proximal end of the anti-fistula bracket 300. When the pushing assembly 210 is pulled away from the distal end of the loading sleeve 220, the second connecting line 250 can pull the sealing member 230 out from inside the anti-fistula bracket 300 to the proximal end of the loading sleeve 220, thus switching the anti-fistula bracket 300 from a constricted state to an anti-fistula state, and extending the proximal end of the anti-fistula bracket 300 into the proximal end of the rectum 20. After the second connecting line 250 extends the proximal end of the anti-fistula bracket 300 into the proximal end of the rectum 20, the second connecting line 250 is cut. During this process, by setting the second connecting line 250, it can be ensured that the anti-fistula bracket 300 is fully deployed in its axial direction during the pulling of the pushing assembly 210, ensuring the anti-fistula effect while maintaining the flowability of the passageway.

[0053] To further prevent the anti-fistula stent 300 from shifting due to intestinal peristalsis and affecting its anti-fistula effect, in this embodiment, the proximal end of the anti-fistula stent 300 is provided with a flexible rolled edge 310. When the proximal end of the anti-fistula stent 300 extends to the proximal end of the rectum 20, the flexible rolled edge 310 is folded outward and rolled towards the distal end of the anti-fistula stent 300 until the flexible rolled edge 310 abuts against the proximal end of the rectum 20. This allows the flexible rolled edge 310 to restrict the relative position of the anti-fistula stent 300 from the proximal end of the rectum 20, further reducing the probability of displacement of the anti-fistula stent 300. To reduce the feeling of a foreign body, the amount of rolling of the flexible rolled edge 310 can be adaptively adjusted according to individual differences.

[0054] Preferably, the anti-fistula stent 300 is externally fitted with an absorbent element 320 for absorbing tissue fluid, and when the anti-fistula stent 300 is in the anti-fistula state, the absorbent element 320 abuts against the inner wall of the intestine. With this configuration, when the absorbent element 320 abuts against the inner wall of the intestine, on the one hand, the absorbent element 320 has a certain anti-slip effect, and can cooperate with the rigid support portion 302 at the distal end of the anti-fistula stent 300 and the flexible rolled edge 310 at the proximal end of the anti-fistula stent 300 to further enhance the anti-displacement effect of the anti-fistula stent 300; on the other hand, the absorbent element 320 can absorb tissue fluid at the anastomosis site, further enhancing the anti-fistula effect. In this embodiment, the absorbent element 320 is set as absorbent cotton.

[0055] Furthermore, the anti-fistula stent 300 is internally equipped with a drainage tube (not shown in the figure). One end of the drainage tube passes through the side wall of the anti-fistula stent 300 and communicates with the absorbent 320, while the other end extends out of the rectum 20. When the anti-fistula stent 300 is in the constricted state, the drainage tube is placed inside the anti-fistula stent 300. When the anti-fistula stent 300 is in the anti-fistula state, the end of the drainage tube away from the absorbent 320 is pulled out to the proximal end of the anti-fistula stent 300 along with the sealing member 230. When the absorbent 320 absorbs enough tissue fluid, it is drained to the outside of the rectum 20 through the drainage tube, avoiding the situation where the absorbent 320 absorbs too much tissue fluid, which would increase the feeling of a foreign body in the intestine or compress the anti-fistula stent 300, making it difficult for the intestinal contents to pass through the flow channel.

[0056] Preferably, the sealing member 230 is spherical. On the one hand, after the anvil mechanism 200 carrying the anti-fistula stent 300 is placed in the colon 10, the sealing member 230 seals the distal end of the loading sleeve 220, preventing intestinal contents from entering the loading sleeve 220 from the distal end, thus increasing the difficulty of the anastomosis device operation. On the other hand, after the anti-fistula stent 300 is placed in the intestine, when the pushing component 210 is pulled away from the loading sleeve 220, the convenience of the spherical sealing member 230 entering the anti-fistula stent 300 from the distal end is improved. Simultaneously, the sealing member 230 is provided with connection points (not shown in the figure) for easy connection with the first connecting line 240 and the second connecting line 250. The specific shape of the sealing member 230 is not limited to this; in other embodiments, the sealing member 230 can be configured as a hemisphere, ellipsoid, etc., according to actual needs.

[0057] The outer peripheral wall of the loading sleeve 220 is configured as a guide surface, which is inclined in a direction away from the axis of the loading sleeve 220 from the distal end to the proximal end. In this way, the guide surface guides the anvil mechanism 200 during the placement of the anvil mechanism 200 into the colon 10, thereby improving the ease of placement of the anvil mechanism 200.

[0058] Preferably, the pushing assembly 210 includes an abutment seat 211 and a pushing member 212; the abutment seat 211 includes an abutment plate 2111 and an auxiliary rod 2112, the abutment plate 2111 is fixedly disposed at the distal end of the auxiliary rod 2112 and abuts against the proximal end of the loading sleeve 220, and the auxiliary rod 2112 has a connecting channel extending axially in the middle part; the pushing member 212 includes an auxiliary disk 2121 and a pushing rod 2122, the auxiliary disk 2121 is fixedly disposed at the distal end of the pushing rod 2122, the proximal end of the pushing rod 2122 is inserted into the connecting channel from the distal end of the connecting channel and extends out of the connecting channel, the guide shaft 130 can push the pushing rod 2122 to move towards the distal end of the loading sleeve 220, and can be detachably connected to the connecting channel.

[0059] A storage channel is provided in the middle of the push rod 2122, and the ends of the first connecting line 240 and the second connecting line 250 opposite to the sealing member 230 are located in the storage channel. A limiting groove is provided in the middle of the push rod 2122, which extends in a ring shape along the circumference of the push rod 2122. A limiting member is provided in the connecting channel. After the proximal end of the push rod 2122 is inserted into the connecting channel from the far end, when the guide shaft 130 is not connected to the auxiliary rod 2112, the auxiliary disk 2121 abuts against the abutment disk 2111, and the limiting groove is limited by the limiting member in the connecting channel to restrict the relative position of the anvil 211 and the push member 212 in the axial direction of the push rod 2122, so as to avoid the two from separating and increasing the workload. A first protrusion is provided at the proximal end of the push rod 2122, extending in a ring shape along the circumference of the push rod 2122. A second protrusion is provided on the inner wall of the distal end of the connecting channel, extending in a ring shape along the circumference of the connecting channel. When the guide shaft 130 pushes the push rod 2122 towards the distal end of the loading sleeve 220 until the anti-fistula stent 300 loaded in the loading sleeve 220 is pushed into the intestine, the first and second protrusions engage to limit the relative position of the anvil seat 211 and the push member 212 in the axial direction of the push rod 2122, preventing the push member 212 from detaching from the anvil seat 211 and falling into the intestine. In addition, to improve the connection strength and stability between the loading sleeve 220 and the abutment plate 2111, an abutment protrusion is provided on the side of the abutment plate 2111 near the loading sleeve 220, which can abut against the inner wall of the proximal end of the loading sleeve 220.

[0060] Preferably, the inner wall of the connecting channel is provided with a spring piece, and the side of the spring piece near the axis of the connecting channel is provided with a snap-fit ​​protrusion 2113 that can engage with the guide shaft 130. The proximal end of the spring piece is fixedly connected to the auxiliary rod 2112, and the distal end extends towards the distal end of the auxiliary rod 2112 and is set as a free end. When the guide shaft 130 is not connected to the auxiliary rod 2112, the snap-fit ​​protrusion 2113 is limited and engaged with the limiting groove on the push rod 2122. During the process of the guide shaft 130 pushing the push rod 2122 towards the distal end of the loading sleeve 220, the spring piece is forced to move away from the axis of the connecting channel, and the snap-fit ​​protrusion 2113 moves away from the axis of the push rod 2122. The anti-fistula stent 300, mounted in the loading sleeve 220, disengages from the limiting groove, allowing the pusher 212 to push it into the intestine. Once the anti-fistula stent 300 is in the intestine, the snap-fit ​​protrusion 2113 on the spring clip engages with the snap-fit ​​connection on the guide shaft 130, pulling the guide shaft 130 towards the rectum 20. This causes the pusher 2122 to move towards the rectum 20, switching the anti-fistula stent 300 from a constricted state to an anti-fistula state. The number of spring clips is determined based on actual conditions and is not specifically limited here.

[0061] In some other embodiments, the inner wall of the connecting channel is provided with a magnetic element, and the guide shaft 130 is provided with an auxiliary element that can be magnetically connected to the magnetic element. After the guide shaft 130 pushes the anti-fistula stent 300 into the intestine via the pusher 212, the guide shaft 130 is connected to the auxiliary rod 2112 by magnetic attraction, and the guide shaft 130 is pulled towards the rectum 20, causing the pusher 2122 to move towards the rectum 20, thus switching the anti-fistula stent 300 from a constricted state to an anti-fistula state. Alternatively, the distal end of the guide shaft 130 is provided with an external thread, and the proximal end of the connecting channel is provided with an internal thread. After the guide shaft 130 pushes the anti-fistula stent 300 into the intestine via the pusher 212, the guide shaft 130 is threadedly connected to the auxiliary rod 2112, so as to facilitate the switching of the anti-fistula stent 300 from a constricted state to an anti-fistula state.

[0062] In the non-surgical state, in order to prevent the anvil mechanism 200 from detaching from the anastomosis mechanism 100, the anti-fistula type stapler also includes a connecting bracket 400, through which the anvil mechanism 200 can be constricted to the anastomosis mechanism 100.

[0063] Specifically, one side of the connecting bracket 400 is provided with a first locking part 410 and a handle 440, and the side opposite to the first locking part 410 is provided with a second locking part 420 and a connecting cover 430, with a positioning plug on the connecting cover 430. When the anvil mechanism 200 is retracted into the anastomosis mechanism 100, the first locking part 410 is engaged with the auxiliary rod 2112, the second locking part 420 is engaged with the anastomosis device body 110, the connecting cover 430 abuts against the distal end of the anastomosis cutting assembly 120, and the positioning plug is placed in the guide channel on the anastomosis cutting assembly 120 that allows the guide shaft 130 to pass through. In this way, on the one hand, the retraction effect of the anvil mechanism 200 after retracting into the anastomosis mechanism 100 is ensured; on the other hand, foreign objects are prevented from entering the anastomosis cutting assembly 120 and the anastomosis device body 110 from the guide channel. Pulling the handle 440 can assist in removing the anvil mechanism 200 from the anastomosis mechanism 100.

[0064] In addition to achieving postoperative anastomosis of the colon 10 and rectum 20, the anti-fistula type anastomosing device provided in this embodiment can also be used for esophageal anastomosis according to actual needs.

[0065] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A fistula-preventing anastomosis device for postoperative anastomosis of the colon (10) and rectum (20), characterized in that, Comprise; Anastomosis mechanism (100) comprising anastomosis device body (110), anastomosis and cutting assembly (120) and guide shaft (130), the anastomosis and cutting assembly (120) is arranged at the distal end of the anastomosis device body (110), for completing the anastomosis operation of the colon (10) and the rectum (20), the guide shaft (130) is movably arranged in the anastomosis device body (110), and can be stretched out at the distal end of the anastomosis and cutting assembly (120); Nail resisting mechanism (200) comprising pushing assembly (210), loading sleeve (220), blocking piece (230) and first connecting line (240), the blocking piece (230) is arranged at the distal end of the loading sleeve (220), the pushing assembly (210) is arranged at the proximal end of the loading sleeve (220), and can be detachably connected to the guide shaft (130), the blocking piece (230) is connected to the pushing assembly (210) through the first connecting line (240); Anti fistula stent (300) is arranged in the loading sleeve (220) and is located between the blocking piece (230) and the pushing assembly (210), the guide shaft (130) pushes the pushing assembly (210) towards the distal end of the loading sleeve (220), which can make the anti fistula stent (300) placed in the intestinal tract, the anti fistula stent (300) is arranged in a cylindrical shape, along the axial direction of the anti fistula stent (300), comprising a plurality of flexible support parts (301) and rigid support parts (302) arranged alternately, the distal end of the anti fistula stent (300) is arranged as the rigid support part (302), and the cross-sectional area of the distal end of the anti fistula stent (300) is greater than that of the middle part of the anti fistula stent (300); Wherein, the anti fistula stent (300) has a convergence state and an anti fistula state after being placed in the intestinal tract, when the anti fistula stent (300) is in the anti fistula state, the distal end of the anti fistula stent (300) abuts against the inner wall of the intestinal tract, and the pushing assembly (210) can move away from the distal end of the loading sleeve (220) to make the anti fistula stent (300) switch from the convergence state to the anti fistula state.

2. The anti-tube stapler according to claim 1, wherein The nail resisting mechanism (200) further comprises a second connecting line (250), which is connected between the blocking piece (230) and the proximal end of the anti fistula stent (300); When the pushing assembly (210) moves away from the distal end of the loading sleeve (220), the second connecting line (250) can pull the blocking piece (230) out of the anti fistula stent (300) to the proximal end of the loading sleeve (220) to make the anti fistula stent (300) switch from the convergence state to the anti fistula state, and the proximal end of the anti fistula stent (300) extends to the proximal end of the rectum (20).

3. The anti-tube anastomat according to claim 1, wherein The proximal end of the anti-fistula stent (300) is provided with a flexible roll edge (310), which limits the relative position of the anti-fistula stent (300) from the proximal end of the rectum (20) when the proximal end of the anti-fistula stent (300) extends to the proximal end of the rectum (20).

4. The anti-tube stapler according to claim 1, wherein The outside of the anti-fistula stent (300) is sleeved with an absorption member (320) for absorbing tissue fluid, and the absorption member (320) abuts against the inner wall of the intestinal tract when the anti-fistula stent (300) is in the anti-fistula state.

5. The anti-tube stapler according to claim 4, wherein The inside of the anti-fistula stent (300) is provided with a drainage tube, one end of the drainage tube communicates with the absorption member (320) through the side wall of the anti-fistula stent (300), and the other end can extend out of the rectum (20).

6. The tube-saving anastomosis apparatus according to claim 1, wherein The blocking member (230) is provided as a sphere, and the peripheral wall of the loading sleeve (220) is provided as a guide surface, which is inclined away from the axis of the loading sleeve (220) from the distal end to the proximal end of the loading sleeve (220).

7. The tube-saving anastomosis apparatus according to claim 1, wherein The pushing assembly (210) includes a nail abutting seat (211) and a pushing member (212); The nail abutting seat (211) includes an abutting disc (2111) and an auxiliary rod (2112), the abutting disc (2111) is fixedly arranged at the distal end of the auxiliary rod (2112) and abuts against the proximal end of the loading sleeve (220), and the middle part of the auxiliary rod (2112) is provided with a connecting channel extending in the axial direction thereof; The pushing member (212) includes an auxiliary disc (2121) and a pushing rod (2122), the auxiliary disc (2121) is fixedly arranged at the distal end of the pushing rod (2122), the proximal end of the pushing rod (2122) is inserted into the connecting channel from the distal end of the connecting channel and extends out of the connecting channel, the guide shaft (130) can push the pushing rod (2122) to move towards the distal end of the loading sleeve (220), and the guide shaft (130) can be detachably connected to the connecting channel.

8. The anti-tube stapler according to claim 7, wherein The inner wall of the connecting channel is provided with a spring sheet, and the side of the spring sheet close to the axis of the connecting channel is provided with a clamping protrusion (2113) capable of clamping the guide shaft (130).

9. The anti-tube stapler according to claim 7, wherein The inner wall of the connecting channel is provided with a magnetic member, and the guide shaft (130) is provided with an auxiliary member capable of magnetically connecting with the magnetic member.

10. The anti-tube anastomat according to any one of claims 1 to 9, wherein The anti-fistula tube anastomat further comprises a connecting support (400), and the nail abutting mechanism (200) can be gathered by the connecting support (400) to the anastomosis mechanism (100).

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