Anti-fistula type anastomat

Abstract

The invention provides an anti-fistula type anastomat, and relates to the technical field of medical instruments. The fistula-preventing anastomat comprises an anastomosis mechanism, a nail abutting mechanism and a fistula-preventing support, an osculating assembly in the anastomosis mechanism is arranged on an anastomat body, and a guide shaft is movably arranged on the anastomat body; a blocking piece in the nail abutting mechanism is arranged at the far end of the loading sleeve, a pushing assembly is arranged at the near end of the loading sleeve and can be detachably connected to the guiding shaft, and the blocking piece is connected to the pushing assembly; the fistula-proof support is arranged in the loading sleeve, the pushing assembly is pushed to enable the fistula-proof support to be arranged in the intestinal tract, and the sectional area of the far end of the fistula-proof support is larger than that of the middle of the fistula- The fistula-preventing support has a tightening state and a fistula-preventing state after being placed in the intestinal tract, in the fistula-preventing state, the far end of the fistula-preventing support abuts against the inner wall of the intestinal tract, and the pushing assembly is moved to enable the fistula-preventing support to be switched from the tightening state to the fistula-preventing state. The fistula-preventing anastomat is easy to operate, the fistula-preventing support can be prevented from shifting in the intestinal tract, the fistula-preventing effect is guaranteed, and foreign body sensation is relieved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an anti-fistula tube-type stapler. Background Art

[0002] The tubular stapler is a device used to connect the two ends of the intestine during gastrointestinal resection surgery. During the anastomosis, the two sections of tissue are contained in the stapler. After the firing is completed, a circular anastomosis is formed on the tissue, thereby rebuilding the human body passage. However, some patients still experience anastomotic fistulas, anastomotic bleeding, and anastomotic stenosis after surgery, which requires another surgery, increasing the financial and psychological burden on patients.

[0003] In the prior art, after the anastomosis is completed, a tubular stapler usually places a coated stent in the intestine to form a channel for the intestinal contents to flow at the anastomosis, thereby avoiding the occurrence of the above-mentioned situation; however, the structure of the existing tubular stapler for placing the coated stent is usually more complicated, which makes the process of placing the coated stent cumbersome, and after the coated stent is placed in the intestine, the coated stent will shift with the peristalsis of the intestine, resulting in poor fistula prevention effect. If the coated stent is positioned with the help of external instruments, the patient's foreign body sensation will increase. Summary of the invention

[0004] The object of the present invention is to provide an anti-fistula tube-type stapler, which is easy to operate and can prevent the anti-fistula stent from shifting in the intestine, thereby ensuring the anti-fistula effect and reducing the foreign body sensation.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The anti-fistula tube-type stapler is used for postoperative anastomosis of the colon and rectum and can prevent fistula at the anastomosis, including:

[0007] The anastomosis mechanism comprises an anastomosis device body, an anastomosis assembly and a guide shaft, wherein the anastomosis assembly is arranged at the distal end of the anastomosis device body and is used to complete the anastomosis operation of the colon and the rectum, and the guide shaft is movably arranged at the anastomosis device body and can extend out of the distal end of the anastomosis assembly;

[0008] The nail anvil mechanism comprises a pushing assembly, a loading sleeve, a blocking member and a first connecting line, wherein the blocking member is arranged at the distal end of the loading sleeve, the pushing assembly is arranged at the proximal end of the loading sleeve and can be detachably connected to the guide shaft, and the blocking member is connected to the pushing assembly via the first connecting line;

[0009] The fistula-preventing stent is arranged in the loading sleeve and is located between the blocking member and the pushing assembly. The guiding shaft pushes the pushing assembly in a direction close to the distal end of the loading sleeve, so that the fistula-preventing stent can be placed in the intestine. The fistula-preventing stent is arranged in a cylindrical shape and comprises a plurality of sections of flexible support parts and rigid support parts arranged alternately along the axial direction of the fistula-preventing stent. The distal end of the fistula-preventing stent is arranged as the rigid support part, and the cross-sectional area of ​​the distal end of the fistula-preventing stent is larger than the cross-sectional area of ​​the middle part of the fistula-preventing stent.

[0010] Among them, the fistula-preventing stent has a contracted state and a fistula-preventing state after being placed in the intestine. When the fistula-preventing stent is in the fistula-preventing state, the distal end of the fistula-preventing stent abuts against the inner wall of the intestine, and the pushing assembly can move in a direction away from the distal end of the loading sleeve to switch the fistula-preventing stent from the contracted state to the fistula-preventing state.

[0011] As a further technical solution, the anvil mechanism further includes a second connecting line, and the second connecting line is connected between the blocking member and the proximal end of the fistula-preventing stent;

[0012] When the pushing assembly moves in a direction away from the distal end of the loading sleeve, the second connecting line can drive the blocking member to be pulled out from the interior of the fistula-preventing stent to the proximal end of the loading sleeve, so that the fistula-preventing stent is switched from a contracted state to a fistula-preventing state, and the proximal end of the fistula-preventing stent is extended to the proximal end of the rectum.

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

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

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

[0016] As a further technical solution, the blocking member is configured as a sphere, and the outer peripheral wall of the loading sleeve is configured as a guide surface, and from the distal end to the proximal 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 assembly includes a pin holder and a pushing member;

[0018] The anvil seat comprises an abutment plate and an auxiliary rod, wherein the abutment plate is fixedly arranged at the distal end of the auxiliary rod and abuts against the proximal end of the loading sleeve, and a connecting channel extending along the axial direction thereof is arranged in the middle portion of the auxiliary rod;

[0019] The pushing member includes an auxiliary disk and a pushing rod, the auxiliary disk is fixedly arranged 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 in a direction close to the distal end of the loading sleeve, and can be detachably connected to the connecting channel.

[0020] As a further technical solution, an inner wall of the connecting channel is provided with an elastic sheet, and a clamping protrusion capable of clamping with the guide shaft is provided on one side of the elastic sheet close to the axis of the connecting channel.

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

[0022] As a further technical solution, the anti-fistula tube-type stapler further comprises a connecting bracket, and the anastomosis mechanism can be converged to the anastomosis mechanism through the connecting bracket.

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

[0024] 1. Since the fistula-preventing stent includes multiple sections of flexible support parts and rigid support parts alternately arranged along its axial direction, the distal end of the fistula-preventing stent is arranged as a rigid support part, and the cross-sectional area of ​​the distal end of the fistula-preventing stent is larger than the cross-sectional area of ​​the middle part of the fistula-preventing stent; at the same time, the fistula-preventing stent is arranged in the loading cylinder and is located between the blocking part and the pushing component, and the pushing component can be detachably connected to the guide shaft. Therefore, when performing anastomosis and suturing of the colon and rectum, firstly, the stapler mechanism equipped with the fistula-proof stent is placed in the colon, and the pushing assembly is exposed at the proximal end of the colon, and then the stapler body is inserted into the rectum to place the anastomosis assembly in the rectum; secondly, the guide shaft is connected to the pushing assembly, and the guide shaft is pushed so that the pushing assembly pushes the fistula-proof stent into the colon; then, the anastomosis assembly performs anastomosis and suturing of the colon and rectum; thereafter, the guide shaft is pulled toward the distal end of the rectum, so that the blocking piece passes through the middle of the fistula-proof stent through the pushing assembly and the first connecting line, until the blocking piece is pulled out from the proximal end of the fistula-proof stent, so that the fistula-proof stent switches from the contracted state to the fistula-proof state, so as to form a channel for the flow of intestinal contents at the corresponding anastomotic opening in the intestine. During the process of the blocking piece being pulled out from the proximal end of the fistula-preventing stent, the fistula-preventing stent is expanded and stretched under the action of the blocking piece, so that the outer wall of the fistula-preventing stent fits against the inner wall of the intestine and covers the anastomosis; since the distal end of the fistula-preventing stent is arranged as a rigid support part, and the cross-sectional area of ​​the distal end of the fistula-preventing stent is larger than the cross-sectional area of ​​the middle part of the fistula-preventing stent, when the fistula-preventing stent is expanded, the distal end of the fistula-preventing stent abuts against the inner wall of the intestine, so that the fistula-preventing stent can cooperate with the intestine and achieve positioning with the help of its own structural characteristics, thereby avoiding the displacement of the fistula-preventing stent with the peristalsis of the intestine, and the flexible support part can avoid the overall contact of the fistula-preventing stent with the inner wall of the intestine, thereby ensuring the fistula-preventing effect while avoiding the limitation of the fistula-preventing stent with the help of external instruments, thereby reducing the patient's foreign body sensation.

[0025] 2. Since the nail annulus mechanism is composed of only a pushing assembly, a loading sleeve, a blocking piece and a first connecting line, the structure is simple; during the process of anastomosis and suturing of the colon and rectum, the fistula-proof stent is loaded into the loading sleeve, the pushing assembly is connected to the guide shaft, and the pushing assembly is pushed toward the direction close to the distal end of the loading sleeve through the guide shaft, so that the loading stent can be placed in the intestine; then the pushing assembly is pulled away from the distal end of the loading sleeve so that the blocking piece passes through the middle of the fistula-proof stent, so that the fistula-proof stent can be opened and stretched, so that the outer wall of the fistula-proof stent fits the inner wall of the intestine and covers the anastomosis. The whole process ensures the fistula-proof effect, and the operation is simple and convenient because the nail annulus mechanism has a simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0027] Figure 1 is a cross-sectional view of an anti-fistula tubular stapler provided by an embodiment of the present invention;

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

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

[0030] Figure 4 It is a structural schematic diagram of a connecting bracket in an anti-fistula tubular stapler provided in an embodiment of the present invention;

[0031] Figure 5 It is a cross-sectional view of an anti-fistula tube-type stapler provided by an embodiment of the present invention, in which an anvil mechanism loaded with an anti-fistula stent is placed in the intestine;

[0032] Figure 6 It is a cross-sectional view of an anti-fistula stent loaded with an anvil mechanism in an anti-fistula tube-type stapler provided by an embodiment of the present invention pushing the anti-fistula stent into the intestine;

[0033] Figure 7 It is a cross-sectional view of the fistula-proof stent and the stapler mechanism in the fistula-proof tube-type stapler provided by an embodiment of the present invention when the fistula-proof stent is in a fistula-proof state.

[0034] In the figure:

[0035] 10. Colon; 20. Rectum;

[0036] 100, anastomosis mechanism; 110, stapler body; 120, anastomosis assembly; 130, guide shaft;

[0037] 200, anvil mechanism; 210, pushing assembly; 211, anvil seat; 2111, abutment plate; 2112, auxiliary rod; 2113, clamping protrusion; 212, pushing member; 2121, auxiliary plate; 2122, pushing rod; 220, loading sleeve; 230, blocking member; 240, first connecting line; 250, second connecting line;

[0038] 300, fistula-proof stent; 301, flexible support portion; 302, rigid support portion; 310, flexible curling edge; 320, absorbent;

[0039] 400, connecting bracket; 410, first clamping portion; 420, second clamping portion; 430, connecting cover; 440, handle. DETAILED DESCRIPTION

[0040] Before any embodiments of the application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the above drawings.

[0041] In this application, the terms "comprises", "includes", "has" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0042] In this application, the term "and / or" is a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects before and after are in an "and / or" relationship.

[0043] In the present application, the terms "connect", "combine", "couple", and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, direct connection refers to two parts or components being connected together without the need for an intermediate piece, and indirect connection refers to two parts or components being connected to at least one intermediate piece respectively, and the two parts or components being connected via the intermediate piece. In addition, "connect" and "couple" are not limited to physical or mechanical connections or couplings, and may include electrical connections or couplings.

[0044] In the present application, it will be understood by those of ordinary skill in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerances caused by manufacturing, assembly, and use associated with a specific value, and the like. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0045] In this application, it will be understood by those skilled in the art 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 the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, the bottom can include directly below, lower left, lower right, lower front, and lower back, etc.

[0047] Combination Figure 1 and Figure 7As shown, the fistula-proof tube-type stapler (hereinafter referred to as stapler) provided in this embodiment is used for postoperative anastomosis of the colon 10 and the rectum 20, and can prevent fistula at the anastomosis. The fistula-proof tube-type stapler is easy to operate and can prevent the fistula-proof stent 300 from shifting in the intestine, thereby ensuring the fistula-proof effect and reducing the foreign body sensation. Specifically, the fistula-proof tube-type stapler includes: the stapler mechanism 100 includes a stapler body 110, an anastomosis assembly 120 and a guide shaft 130, the anastomosis assembly 120 is arranged 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 arranged on the stapler body 110, and can extend from the distal end of the anastomosis assembly 120; the anastomosis mechanism 200 includes a pushing assembly 210, a loading sleeve 220, a blocking member 230 and a first connecting line 240, the blocking member 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 1 30, the blocking member 230 is connected to the pushing assembly 210 through the first connecting line 240; the fistula-proof stent 300 is arranged in the loading sleeve 220 and is located between the blocking member 230 and the pushing assembly 210, and the guide shaft 130 pushes the pushing assembly 210 toward the distal end of the loading sleeve 220, so that the fistula-proof stent 300 can be placed in the intestine. The fistula-proof stent 300 is arranged in a cylindrical shape, and along the axial direction of the fistula-proof stent 300, it includes a plurality of sections of flexible support parts 301 and rigid support parts 302 alternately arranged, the distal end of the fistula-proof stent 300 is arranged as the rigid support part 302, and the cross-sectional area of ​​the distal end of the fistula-proof stent 300 is larger than the cross-sectional area of ​​the middle part of the fistula-proof stent 300. Among them, after the fistula-preventing stent 300 is placed in the intestine, it has a contracted state and a fistula-preventing state. When the fistula-preventing stent 300 is in the fistula-preventing state, the distal end of the fistula-preventing stent 300 abuts against the inner wall of the intestine, and the pushing assembly 210 is pulled in the direction away from the distal end of the loading sleeve 220, so that the fistula-preventing stent 300 switches from the contracted state to the fistula-preventing state.

[0048] Since the fistula-preventing stent 300 includes multiple sections of flexible support parts 301 and rigid support parts 302 that are alternately arranged along its axial direction, the distal end of the fistula-preventing stent 300 is arranged as the rigid support part 302, and the cross-sectional area of ​​the distal end of the fistula-preventing stent 300 is larger than the cross-sectional area of ​​the middle part of the fistula-preventing stent 300; at the same time, the fistula-preventing stent 300 is arranged in the loading cylinder and is located between the blocking member 230 and the pushing assembly 210, and the pushing assembly 210 can be detachably connected to the guide shaft 130. Therefore, when the colon 10 and the rectum 20 are anastomosed, the nailing mechanism 200 equipped with the fistula-preventing stent 300 is first 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 assembly 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 fistula-preventing stent 300 into the colon 10. ; Then, the anastomosis component 120 performs anastomosis and suturing on the colon 10 and the rectum 20; thereafter, the guide shaft 130 is pulled toward the distal end of the rectum 20, so that the blocking piece 230 passes through the middle part of the fistula-proof stent 300 by pushing the component 210 and the first connecting line 240 until the blocking piece 230 is pulled out from the proximal end of the fistula-proof stent 300, thereby switching the fistula-proof stent 300 from the contracted state to the fistula-proof state, so as to form a circulation channel for the flow of intestinal contents at the corresponding anastomotic opening in the intestine. In the process of the blocking piece 230 being pulled out from the proximal end of the fistula-preventing stent 300, the fistula-preventing stent 300 is expanded and stretched under the action of the blocking piece 230, so that the outer wall of the fistula-preventing stent 300 fits the inner wall of the intestine and covers the anastomosis; since the distal end of the fistula-preventing stent 300 is set as a rigid support part 302, and the cross-sectional area of ​​the distal end of the fistula-preventing stent 300 is larger than the cross-sectional area of ​​the middle part of the fistula-preventing stent 300, when the fistula-preventing stent 300 is expanded, the distal end of the fistula-preventing stent 300 abuts against the inner wall of the intestine, so that the fistula-preventing stent 300 can cooperate with the intestine and achieve positioning with the help of its own structural characteristics, thereby avoiding the displacement of the fistula-preventing stent 300 with the peristalsis of the intestine, and the flexible support part 301 can prevent the fistula-preventing stent 300 from completely abutting against the inner wall of the intestine as a whole, thereby ensuring the fistula-preventing effect while avoiding the use of external instruments to limit the fistula-preventing stent 300, thereby reducing the patient's foreign body sensation.

[0049] Since the nail anvil mechanism 200 is composed of only a pushing assembly 210, a loading sleeve 220, a blocking piece 230 and a first connecting line 240, the structure is simple; in the process of anastomosis and suturing of the colon 10 and the rectum 20, the fistula-proof stent 300 is loaded into the loading sleeve 220, the pushing assembly 210 is connected to the guide shaft 130, and the pushing assembly 210 is pushed toward the distal end of the loading sleeve 220 through the guide shaft 130, so that the loading stent can be placed in the intestine; then, the pushing assembly 210 is pulled away from the distal end of the loading sleeve 220, so that the blocking piece 230 passes through the middle of the fistula-proof stent 300, so that the fistula-proof stent 300 can be stretched and extended, so that the outer wall of the fistula-proof stent 300 fits the inner wall of the intestine and covers the anastomosis. While the whole process ensures the fistula-proof effect, the operation is simple and convenient because the nail anvil mechanism 200 has a simple structure.

[0050] In addition, in this embodiment, the inner wall of the fistula-preventing stent 300 is provided with a coating, thereby the fistula-preventing stent 300 is provided in a cylindrical shape consisting of a plurality of sections of flexible support parts 301 and rigid support parts 302 alternately provided, wherein the rigid support part 302 is made of a tightly wound nickel-titanium alloy wire, and the flexible support part 301 is made of a tightly wound flexible wire material, so that the flexible support part 301 can further prevent the coating from being adsorbed on the inner wall of the intestine, thereby further reducing the foreign body sensation; and it is convenient to compress the fistula-preventing stent 300 and load it into the nailing mechanism 200. An anti-stick coating is applied on the inner side of the coating to prevent the intestinal contents from adhering to the fistula-preventing stent 300 when flowing through the circulation channel, so as to facilitate the passage of the intestinal contents.

[0051] The middle and distal ends of the fistula-proof stent 300 are arranged in a straight cylindrical shape, and the cross-sectional shape of the rigid support portion 302 arranged at the distal end of the fistula-proof stent 300 is not specifically limited, and the cross-sectional shape of the rigid support portion 302 arranged at the distal end of the fistula-proof stent 300 can meet the requirement that the cross-sectional area of ​​the rigid support portion 302 at the distal end of the fistula-proof stent 300 is greater than the cross-sectional area of ​​the middle part of the fistula-proof stent 300. In this embodiment, the rigid support portion 302 at the distal end of the fistula-proof stent 300 is arranged in a cup-shaped shape. With such arrangement, on the one hand, in the process of switching the fistula-proof stent 300 from the contracted state to the fistula-proof state, it is convenient for the blocking member 230 to enter the fistula-proof stent 300 from the distal end. On the other hand, when the fistula-proof stent 300 is in the fistula-proof state, the outer peripheral wall of the rigid support portion 302 at the distal end of the fistula-proof stent 300 is completely in contact with the inner wall of the intestine to ensure the limiting effect of the fistula-proof stent 300.

[0052] Preferably, the anvil mechanism 200 further includes a second connecting line 250, which is connected between the blocking member 230 and the proximal end of the fistula prevention stent 300; the pushing assembly 210 is pulled in a direction away from the distal end of the loading sleeve 220, and the second connecting line 250 can drive the blocking member 230 to be pulled out from the inside of the fistula prevention stent 300 to the proximal end of the loading sleeve 220, so that the fistula prevention stent 300 is switched from the contracted state to the fistula prevention state, and the proximal end of the fistula prevention stent 300 is extended to the proximal end of the rectum 20. After the second connecting line 250 extends the proximal end of the fistula prevention stent 300 to the proximal end of the rectum 20, the second connecting line 250 is cut. In this process, by setting the second connecting line 250, it can be ensured that the fistula prevention stent 300 is fully unfolded in the axial direction thereof during the process of pulling the pushing assembly 210, thereby ensuring the fistula prevention effect and the flowability of the circulation channel.

[0053] In order to further prevent the fistula-preventing stent 300 from shifting under the peristalsis of the intestine, thereby affecting the fistula-preventing effect, in this embodiment, a flexible curling edge 310 is provided at the proximal end of the fistula-preventing stent 300. When the proximal end of the fistula-preventing stent 300 extends to the proximal end of the rectum 20, the flexible curling edge 310 is folded outwardly toward the distal end of the fistula-preventing stent 300 until the flexible curling edge 310 abuts against the proximal end of the rectum 20, so that the flexible curling edge 310 limits the relative position of the fistula-preventing stent 300 from the proximal end of the rectum 20, further reducing the probability of displacement of the fistula-preventing stent 300. In order to reduce the foreign body sensation, the winding amount of the flexible curling edge 310 can be adaptively changed according to individual differences.

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

[0055] Furthermore, a drainage tube (not shown in the figure) is provided inside the fistula-proof stent 300, one end of which passes through the side wall of the fistula-proof stent 300 and communicates with the absorber 320, and the other end of which can extend out of the rectum 20. When the fistula-proof stent 300 is in the contracted state, the drainage tube is placed inside the fistula-proof stent 300. When the fistula-proof stent 300 is in the fistula-proof state, the end of the drainage tube that is away from the absorber 320 is pulled out to the proximal end of the fistula-proof stent 300 along with the blocking member 230. When the absorber 320 absorbs enough tissue fluid, it is drained out of the rectum 20 through the drainage tube, so as to avoid the absorber 320 absorbing too much tissue fluid and causing an increase in the intestinal foreign body sensation or compressing the fistula-proof stent 300, which makes it difficult for the intestinal contents to flow through the circulation channel.

[0056] Preferably, the blocking member 230 is set as a sphere. On the one hand, after the anvil mechanism 200 loaded with the fistula-preventing stent 300 is placed in the colon 10, the blocking member 230 blocks the distal end of the loading sleeve 220 to prevent the intestinal contents from entering the loading sleeve 220 from the distal end of the loading sleeve 220, so as to increase the difficulty of operating the stapler; on the other hand, after the fistula-preventing stent 300 is placed in the intestine, when the pushing assembly 210 is pulled away from the loading sleeve 220, the convenience of the blocking member 230 set as a sphere entering the interior of the fistula-preventing stent 300 from the distal end of the fistula-preventing stent 300 is improved. At the same time, a connection point (not shown in the figure) is set on the blocking member 230 to facilitate connection with the first connecting line 240 and the second connecting line 250. The specific form of the blocking member 230 is not limited to this. In other embodiments, the blocking member 230 can be set as a hemisphere, an ellipsoid, etc. according to actual needs.

[0057] The outer peripheral wall of the loading sleeve 220 is provided as a guide surface, and from the distal end to the proximal end of the loading sleeve 220, the guide surface is inclined in a direction away from the axis of the loading sleeve 220. In this way, during the process of placing the anvil mechanism 200 in the colon 10, the guide surface guides the anvil mechanism 200 to improve the convenience of placing the anvil mechanism 200.

[0058] Preferably, the pushing assembly 210 includes a dowel seat 211 and a pushing member 212; the dowel seat 211 includes an abutment plate 2111 and an auxiliary rod 2112, the abutment plate 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 a connecting channel extending along its axial direction is arranged in the middle part of the auxiliary rod 2112; the pushing member 212 includes an auxiliary plate 2121 and a pushing rod 2122, the auxiliary plate 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 in the direction close to 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 one end of the first connection line 240 and the second connection line 250 away from the blocking member 230 is provided in the storage channel. A limiting groove is provided in the middle of the push rod 2122, and the limiting groove extends in a ring shape along the circumference of the push rod 2122. A limiting member is provided in the connection channel. After the proximal end of the push rod 2122 is inserted into the connection channel from the distal end of the connection channel, 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 limitedly connected with the limiting member in the connection channel to limit the relative position of the anvil seat 211 and the push member 212 in the axial direction of the push rod 2122, so as to avoid the two from being separated from each other and increasing the workload. The proximal end of the push rod 2122 is provided with a first boss, which extends in a ring shape along the circumference of the push rod 2122, and the inner wall of the distal end of the connecting channel is provided with a second boss, which extends in a ring shape along the circumference of the connecting channel. When the guide shaft 130 pushes the push rod 2122 to move toward the distal end of the loading sleeve 220 until the fistula-proof stent 300 loaded in the loading sleeve 220 is pushed into the intestine, the first boss and the second boss are limitedly matched to limit the relative position of the anvil seat 211 and the push member 212 in the axial direction of the push rod 2122, so as to prevent the push member 212 from being separated from the anvil seat 211 and falling into the intestine. In addition, in order to improve the connection strength and connection stability between the loading sleeve 220 and the abutment disk 2111, the abutment disk 2111 is provided with an abutment boss that can abut against the inner wall of the proximal end of the loading sleeve 220 on one side close to the loading sleeve 220.

[0060] Preferably, an elastic sheet is provided on the inner wall of the connection channel, and a clamping protrusion 2113 capable of clamping with the guide shaft 130 is provided on one side of the elastic sheet close to the axis of the connection channel. The proximal end of the elastic sheet is fixedly connected to the auxiliary rod 2112, and the distal end extends in a direction close to 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 clamping protrusion 2113 is limitedly engaged with the limiting groove on the push rod 2122; when the guide shaft 130 pushes the push rod 2122 to move in a direction close to the distal end of the loading sleeve 220, the elastic sheet is forced to move in a direction away from the axis of the connection channel, and the clamping protrusion 2113 is released from the push rod 2122. The limiting groove is disengaged so that the pusher 212 can push the fistula prevention bracket 300 loaded in the loading sleeve 220 into the intestine; after the fistula prevention bracket 300 loaded in the loading sleeve 220 is pushed into the intestine, the clamping protrusion 2113 provided on the spring piece is clamped with the clamping connection part on the guide shaft 130, so as to pull the guide shaft 130 in the direction close to the rectum 20, so that the push rod 2122 moves in the direction close to the rectum 20, so that the fistula prevention bracket 300 is switched from the contracted state to the fistula prevention state. The number of spring pieces is set according to actual conditions and is not specifically limited here.

[0061] In some other embodiments, a magnetic member is provided on the inner wall of the connection channel, and an auxiliary member that can be magnetically connected to the magnetic member is provided on the guide shaft 130. After the guide shaft 130 pushes the fistula prevention stent 300 into the intestine through the pusher 212, the guide shaft 130 is connected to the auxiliary rod 2112 by magnetic attraction, and the guide shaft 130 is pulled in the direction close to the rectum 20, so that the pusher 2122 moves in the direction close to the rectum 20, so that the fistula prevention stent 300 is switched from the contracted state to the fistula prevention state. Alternatively, an external thread is provided at the distal end of the guide shaft 130, and an internal thread is provided at the proximal end of the connection channel. After the guide shaft 130 pushes the fistula prevention stent 300 into the intestine through the pusher 212, the guide shaft 130 is threadedly connected to the auxiliary rod 2112, so that the fistula prevention stent 300 is switched from the contracted state to the fistula prevention state.

[0062] In a non-surgical state, in order to prevent the anvil mechanism 200 from being separated from the anastomotic mechanism 100 , the fistula-proof tube-type stapler further includes a connecting bracket 400 , through which the anvil mechanism 200 can be contracted to the anastomotic mechanism 100 .

[0063] Specifically, a first clamping portion 410 and a handle 440 are provided on one side of the connecting bracket 400, and a second clamping portion 420 and a connecting cover 430 are provided at intervals on the side away from the first clamping portion 410, and a positioning plug is provided on the connecting cover 430; when the anvil mechanism 200 is gathered on the anastomosis mechanism 100, the first clamping portion 410 is clamped on the auxiliary rod 2112, the second clamping portion 420 is clamped on the stapler body 110, the connecting cover 430 is abutted against the distal end of the anastomosis assembly 120, and the positioning plug is provided in the guide channel on the anastomosis assembly 120 that allows the guide shaft 130 to pass through. In this way, on the one hand, the convergence effect of the anvil mechanism 200 after being gathered on the anastomosis mechanism 100 is ensured; on the other hand, foreign matter is prevented from entering the anastomosis assembly 120 and the stapler body 110 from the guide channel. Pulling the handle 440 can assist the anvil mechanism 200 in being removed from the anastomosis mechanism 100.

[0064] The fistula-proof tube-type stapler provided in this embodiment can not only realize the anastomosis of the colon 10 and the rectum 20 after surgery, but also be used for the anastomosis of the esophagus 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 embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An anti-fistula tube-type stapler, used for postoperative anastomosis of colon (10) and rectum (20), and capable of preventing fistula at the anastomotic site, characterized in that: include; The anastomosis mechanism (100) comprises an anastomosis device body (110), an anastomosis assembly (120) and a guide shaft (130), wherein the anastomosis assembly (120) is arranged at the distal end of the anastomosis device body (110) and is used to complete the anastomosis operation between the colon (10) and the rectum (20), and the guide shaft (130) is movably arranged at the anastomosis device body (110) and can extend out of the distal end of the anastomosis assembly (120); The nail anvil mechanism (200) comprises a pushing assembly (210), a loading sleeve (220), a blocking member (230) and a first connecting line (240), wherein the blocking member (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), and the blocking member (230) is connected to the pushing assembly (210) via the first connecting line (240); The fistula prevention stent (300) is arranged in the loading sleeve (220) and is located between the blocking member (230) and the pushing assembly (210). The guide shaft (130) pushes the pushing assembly (210) toward the distal end of the loading sleeve (220), so that the fistula prevention stent (300) can be placed in the intestine. The fistula prevention stent (300) is arranged in a cylindrical shape and comprises a plurality of sections of flexible support parts (301) and rigid support parts (302) arranged alternately along the axial direction of the fistula prevention stent (300). The distal end of the fistula prevention stent (300) is arranged as the rigid support part (302), and the cross-sectional area of ​​the distal end of the fistula prevention stent (300) is larger than the cross-sectional area of ​​the middle part of the fistula prevention stent (300); Wherein, after being placed in the intestine, the fistula-preventing stent (300) has a contracted state and a fistula-preventing state. When the fistula-preventing stent (300) is in the fistula-preventing state, the distal end of the fistula-preventing stent (300) abuts against the inner wall of the intestine, and the pushing component (210) can move in a direction away from the distal end of the loading sleeve (220) so that the fistula-preventing stent (300) switches from the contracted state to the fistula-preventing state.

2. The fistula-proof tubular stapler according to claim 1, characterized in that: The anvil mechanism (200) further comprises a second connecting line (250), wherein the second connecting line (250) is connected between the blocking member (230) and the proximal end of the fistula-preventing stent (300); When the pushing assembly (210) moves in a direction away from the distal end of the loading sleeve (220), the second connecting line (250) can drive the blocking member (230) to be pulled out from the inside of the fistula-preventing stent (300) to the proximal end of the loading sleeve (220), so that the fistula-preventing stent (300) switches from a contracted state to a fistula-preventing state, and the proximal end of the fistula-preventing stent (300) extends to the proximal end of the rectum (20).

3. The fistula-proof tubular stapler according to claim 1, characterized in that: The proximal end of the fistula-preventing stent (300) is provided with a flexible curling edge (310). When the proximal end of the fistula-preventing stent (300) extends to the proximal end of the rectum (20), the flexible curling edge (310) limits the relative position of the fistula-preventing stent (300) from the proximal end of the rectum (20).

4. The fistula-proof tubular stapler according to claim 1, characterized in that: The outer sleeve of the fistula-preventing stent (300) is provided with an absorbent (320) for absorbing tissue fluid, and when the fistula-preventing stent (300) is in a fistula-preventing state, the absorbent (320) abuts against the inner wall of the intestine.

5. The fistula-proof tubular stapler according to claim 4, characterized in that: A drainage tube is disposed inside the fistula-preventing stent (300), one end of which passes through the side wall of the fistula-preventing stent (300) and is connected to the absorbent (320), and the other end of which can extend out of the rectum (20).

6. The fistula-proof tubular stapler according to claim 1, characterized in that: The blocking member (230) is configured as a sphere, and the outer peripheral wall of the loading sleeve (220) is configured as a guide surface. From the far end to the proximal end of the loading sleeve (220), the guide surface is inclined in a direction away from the axis of the loading sleeve (220).

7. The fistula-proof tubular stapler according to claim 1, characterized in that: The pushing assembly (210) comprises an anvil (211) and a pushing member (212); The anvil seat (211) comprises an abutment plate (2111) and an auxiliary rod (2112); the abutment plate (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 a connecting channel extending along the axial direction thereof is arranged in the middle of the auxiliary rod (2112); The pushing member (212) includes an auxiliary disk (2121) and a pushing rod (2122), wherein the auxiliary disk (2121) is fixedly arranged at the distal end of the pushing rod (2122), and 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, and the guide shaft (130) can push the pushing rod (2122) to move in a direction close to the distal end of the loading sleeve (220), and can be detachably connected to the connecting channel.

8. The fistula-proof tubular stapler according to claim 7, characterized in that The inner wall of the connecting channel is provided with a spring sheet, and a clamping protrusion (2113) capable of clamping with the guide shaft (130) is provided on one side of the spring sheet close to the axis of the connecting channel.

9. The fistula-proof tubular stapler according to claim 1, characterized in that: The inner wall of the connection channel is provided with a magnetic piece, and the guide shaft (130) is provided with an auxiliary piece that can be magnetically connected to the magnetic piece.

10. The fistula-proof tubular stapler according to any one of claims 1 to 9, characterized in that: The fistula-proof tube-type stapler further comprises a connecting bracket (400), and the anastomosis mechanism (200) can be contracted to the anastomosis mechanism (100) via the connecting bracket (400).

Images