Circular anastomat

Abstract

The invention relates to a circular anastomat which comprises an anastomat body, a nail bin cylinder assembly and a nail bin cylinder assembly. The nail anvil assembly can move relative to the nail bin cylinder assembly to achieve closing; the grasping accessory is used for grasping an assembly on one side of the anastomat body; wherein the staple cartridge cylinder assembly comprises an annular cartridge body, an annular cutting knife arranged on the inner side of the annular cartridge body and at least two assembly parts arranged on the inner side of the annular cutting knife, and the grasping accessories are installed on the assembly parts. According to the circular anastomat, healthy tissue can be reserved as much as possible in an operation, specifically, after the tissue on one side of the anastomat body is grasped through the grasping accessory, the grasping accessory is fixed to the anastomat body so that the tissue on one side of the anastomat body can be fixed, and therefore pouch suture does not need to be conducted on one side of the anastomat body; therefore, the length of the cut tissue on one side of the anus is reduced, the anal anastomosis device is particularly suitable for low rectal cancer surgery, and the anastomosis anal protection effect of the low rectal cancer is achieved.

Description

Technical Field

[0001] The present invention relates to the field of medical instruments, in particular to a circular stapler. Background Art

[0002] In existing rectal cancer surgeries, circular staplers are usually used to butt-sew the two severed parts. During the operation, the two severed parts are fixed to the anvil assembly and the stapler body respectively by combining the purse-string suturing technique, and then the stapler is closed and fired to butt-sew the two severed tissues. In the butt suturing, the purse-string sutured tissue will be removed, but as the industry knows, in low rectal cancer surgery, there is less healthy tissue at the anus, so how to preserve healthy tissue as much as possible is an urgent problem to be solved in the industry. Summary of the invention

[0003] The purpose of the present invention is to provide a circular stapler for improving the quality of low rectal cancer surgery.

[0004] To achieve the above object, the present invention provides the following technical solution: a circular stapler, comprising:

[0005] The stapler body includes a staple cartridge cylinder assembly;

[0006] A nail anvil assembly, which can move relative to the nail magazine cylinder assembly to achieve closure; and

[0007] A gripping attachment, used for gripping a component on one side of the stapler body;

[0008] Wherein, the nail magazine cylinder assembly includes an annular magazine body, an annular cutting knife arranged inside the annular magazine body and at least two assembly parts arranged inside the annular cutting knife, and the grasping attachment is installed on the assembly parts.

[0009] Furthermore, the gripping accessory comprises a plurality of independently arranged gripping members, and the assembly member is connected to the gripping members by hanging.

[0010] Furthermore, one of the assembly part and the gripping part is provided with a hook portion, and the other is provided with a hook ring cooperating with the hook portion.

[0011] Further, the gripping member comprises a first clamping piece and a second clamping piece which are relatively pivotally connected, and an elastic member arranged between the first clamping piece and the second clamping piece; or,

[0012] The gripping member is an elastic clip formed by folding an elastic material; or,

[0013] The gripping member includes a hook portion and an extending portion extending from one side of the hook portion, and the hook ring is formed on the extending portion.

[0014] Furthermore, a plug-in portion is formed on one of the assembly part and the gripping accessory, and a plug-in slot for cooperating with the plug-in portion is provided on the other.

[0015] Furthermore, the plug-in slot is formed on the gripping accessory, and the plug-in slot has a clamping cavity for clamping connection with the plug-in part and an opening extending from the clamping cavity in the plug-in direction and passing through the gripping accessory, and the opening width of the opening is smaller than the inner diameter of the clamping cavity.

[0016] Furthermore, the plug-in slot is a T-shaped slot, the plug-in portion is a T-shaped block that cooperates with the plug-in slot, one of the assembly part and the matching portion is provided with a clamping portion, and the other is provided with a holding slot that docks with the clamping portion, and the clamping portion docks with the clamping slot to lock the plug-in portion and the plug-in slot.

[0017] Furthermore, the clamping portion includes a spring portion for clamping in the clamping groove.

[0018] Further, the gripping attachment comprises a fixing ring and a plurality of gripping members fixed on the fixing ring along the circumference of the fixing ring, the gripping members comprise a first clamping piece and a second clamping piece relatively pivotally connected, and an elastic member arranged between the first clamping piece and the second clamping piece, the first clamping piece or the second clamping piece being fixed on the fixing ring; or,

[0019] The gripping member is an elastic clip formed by folding an elastic material; or,

[0020] The gripping member includes a plurality of hooks formed on the fixing ring.

[0021] Further, the gripping accessory comprises a plurality of independently arranged gripping members, each of which is formed with a plug-in portion or a plug-in slot for plugging with the assembly member, the gripping member comprises a first clamping piece and a second clamping piece pivotally connected to each other, and an elastic member arranged between the first clamping piece and the second clamping piece, and the plug-in portion or the plug-in slot is formed on the first clamping piece and / or the second clamping piece; or,

[0022] The gripping member is composed of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, and the plug-in portion or the plug-in groove is formed on the protrusion; or,

[0023] The gripping member includes a plurality of hooks and a protrusion formed on one end of the hook, and the inserting portion or the inserting groove is formed on the protrusion.

[0024] The annular cutting knife has a blade portion, and an avoidance groove extending along the blade-out direction of the annular cutting knife is formed on the annular cutting knife, a distance is formed between the avoidance groove and the blade portion, and the connecting portion passes through the avoidance groove.

[0025] Further, the annular cutting knife is defined as a first position before firing and a second position after firing;

[0026] After the grasping attachment is installed on the assembly part, the position of the portion of the grasping attachment that fixes the tissue is higher than the position of the blade of the annular cutting knife when it is in the first position, and lower than or equal to the suturing surface.

[0027] The beneficial effect of the present invention is that by using the circular stapler of the present application, as much healthy tissue as possible can be retained during surgery. Specifically, after the tissue on one side of the stapler body is grasped by the grasping accessory, the grasping accessory is fixed on the stapler body to achieve fixation of the tissue on one side of the stapler body, so that there is no need to perform purse-string suture on one side of the stapler body. In this way, the length of the tissue cut on the anus side is reduced. The present invention is particularly suitable for low rectal cancer surgery, achieving the anus-preserving anastomosis effect of low rectal cancer, and helping to improve the quality of surgery.

[0028] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a partial structural schematic diagram of a circular stapler shown in one embodiment of the present invention;

[0030] Figure 2 for Figure 2 a partially exploded view of the structure shown;

[0031] Figure 3 for Figure 1 A schematic diagram of the structure of the gripping attachment and the nail magazine cylinder assembly when assembled;

[0032] Figure 4 for Figure 1 A schematic diagram of the structure of the gripping attachment in FIG.

[0033] Figure 5 for Figure 4 A schematic diagram of the structure of the gripping member;

[0034] Figure 6 is a schematic diagram of the structure of a second gripping attachment used in the present application;

[0035] Figure 7 for Figure 6A schematic diagram of the structure of the gripping member;

[0036] Figure 8 It is a schematic diagram of the structure of the third gripping attachment used in this application. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0041] See also Figures 1 to 3 The circular stapler shown in one embodiment of the present application includes a stapler body, a stapler anvil assembly 10 arranged opposite to the stapler body, and a gripping attachment 20 detachably mounted on the stapler body. The stapler body includes a shaft assembly (not shown), a staple cartridge cylinder assembly 31 mounted on one end of the shaft assembly, and a gripping assembly (not shown) mounted on the other end of the shaft assembly. In this embodiment, the shaft assembly and the gripping assembly adopt the existing technology, which will not be described in detail herein.

[0042] The staple cartridge cylinder assembly 31 is roughly similar to the prior art structure, specifically, the structure similar to the prior art structure includes a cylinder housing 311 mounted on the shaft assembly, an annular cartridge body 312 disposed in the cylinder housing 311, a plurality of suture staples (not shown) disposed in the annular cartridge body 312 and a plurality of staple pushers (not shown) for pushing the suture staples to move, and an annular cutting knife 313 disposed inside the annular cartridge body 312. The staple cartridge cylinder assembly 31 of this embodiment is different from the prior art in that the staple cartridge cylinder assembly 31 further includes a plurality of assembly parts 314 disposed inside the annular cutting knife 313. The number of the assembly parts 314 may also be two or other numbers, depending on the specific situation.

[0043] The anvil assembly 10 is used to dock with the docking rod (not shown) in the cartridge barrel assembly 31, and can move relative to the cartridge barrel assembly 31 to achieve closure. The structure of the anvil assembly 10 is the same as that of the anvil assembly 10 in the prior art, and will not be described in detail. It should be noted that during surgery, the tissue on the side of the anvil assembly 10 is sutured using a purse-string technique.

[0044] The gripping accessory 20 is used to grip the components on one side of the staple cartridge barrel assembly 31. Specifically, the gripping accessory 20 is provided with a plurality of gripping members 21, which are fixed on the severed tissue. During the operation, the gripping accessory 20 first grips the tissue on one side of the staple cartridge barrel assembly 31, and then the gripping accessory 20 is mounted on the assembly member 314.

[0045] By using the circular stapler of the present application, as much healthy tissue as possible can be retained during surgery. Specifically, after grasping the tissue on one side of the stapler body by the grasping accessory 20, the grasping accessory 20 is fixed on the stapler body to achieve fixation of the tissue on one side of the stapler body, so that there is no need to perform purse-string suture on one side of the stapler body. In this way, the length of the tissue cut on the anus side is reduced. The circular stapler is particularly suitable for low rectal cancer surgery, and the anus-preserving anus anastomosis effect of low rectal cancer can be achieved to improve the quality of surgery.

[0046] It should be noted that the radius of the stapler body (excluding the size of the docking rod) of the circular stapler used for low rectal cancer surgery is usually 17 mm, of which 3-5 mm is the length occupied by the suture surface, and the remaining 12-14 mm is the length occupied by the middle cavity of the stapler body. In the purse-string suture technology used in the prior art, the severed tissue sutured by the purse-string usually needs to retain an outer segment of about 5 mm. During the operation, the severed tissue is tensioned on the stapler body. When the stapler is closed, cut and sutured, the tissue tensioned on the middle cavity and the outer segment are removed, that is, the estimated length of the tissue to be removed in the prior art is 17-19 mm.

[0047] By using the circular stapler of the present application, the tissue removed during surgery is less than 17-19 mm. In detail, the gripping member 21 is fixed on the severed tissue, and the distance between the position where the gripping member 21 grips and fixes the tissue and the severed surface of the tissue is approximately (not exceeding) 5 mm. When the gripping accessory 20 is installed on the assembly part 314, the distance between the position where the gripping member 21 grips and fixes the tissue and the inner edge of the suture surface 3121 is approximately within 3 mm. The tissues of the above two distance lengths are the parts to be cut during surgery. In this way, the length of the tissue removed using the circular stapler of the present application is approximately (not exceeding) 8 mm, which is much smaller than the length of the tissue removed by the purse-string suture technique, so it is particularly suitable for low rectal cancer surgery.

[0048] Please combine Figures 2 to 4 In this embodiment, the assembly part 314 includes an assembly part 3141 for installing the gripping attachment 20 and a connecting part (not numbered) for fixing the assembly part 3141 on the annular warehouse body 312. In order to prevent the assembly part 314 from affecting the movement and cutting of the annular cutting knife 313, in this embodiment, a plurality of avoidance grooves 3131 are formed on the annular cutting knife 313. Specifically, the annular cutting knife 313 has a blade part 3132, and the annular cutting knife 313 is formed with an avoidance groove 3131 extending along the knife-out direction of the annular cutting knife 313. A spacing is formed between the avoidance groove 3131 and the blade part 3132. The connecting part passes through the avoidance groove 3131 to connect the assembly part 3141 and the side wall of the annular warehouse body 312.

[0049] In order to minimize the length of the cut tissue, in this embodiment, the annular cutting blade 313 is defined as having a first position ( Figure 3 ) and the second position after firing. After the gripping accessory 20 is installed on the assembly 314, the position of the portion of the gripping accessory 20 that fixes the tissue is higher than the position of the blade 3132 when the annular cutting knife 313 is in the first position, and is lower than or equal to the suture surface 3121. Typically, the distance between the position of the portion of the gripping accessory 20 that fixes the tissue and the position of the blade 3132 is 0.5 mm. With such an arrangement, plus the fact that the linear distance of the axial projection between the position of the blade 3132 and the suture surface 3121 is approximately 1 mm, the distance between the position of the portion of the gripping member 21 that grips and fixes the tissue and the inner edge of the suture surface 3121 is approximately within 3 mm.

[0050] As mentioned above, the gripping accessory 20 is installed on the assembly part 314. In order to facilitate the installation of the gripping accessory 20 to the assembly part 314, the gripping accessory 20 and the assembly part 314 can be connected by plugging or hanging. The above two methods are described in detail later.

[0051] Please combine Figures 3 to 5 A plug-in portion is formed on one of the assembly part 314 and the gripping accessory 20, and a plug-in slot 22 for cooperating with the plug-in portion is provided on the other. The plug-in connection of the assembly part 314 and the gripping accessory 20 is achieved through the plug-in portion and the plug-in slot 22.

[0052] In one embodiment, the assembly portion 3141 is a plug-in portion 3141, and a plug-in slot 22 is formed on the grasping accessory 20. The plug-in slot 22 has a fixing cavity 221 for fixing and connecting with the plug-in portion 3141 and an opening 222 extending from the fixing cavity 221 in the plug-in direction and passing through the grasping accessory 20, and the opening width of the opening 222 is smaller than the inner diameter of the fixing cavity 221.

[0053] In another embodiment, the plug-in slot is a T-slot, the plug-in portion is a T-block matched with the plug-in slot, a clamping portion is provided on one of the assembly part and the matching portion, and a clamping slot docked with the clamping portion is provided on the other, and the clamping portion docks with the clamping slot to lock the plug-in portion and the plug-in slot. The clamping portion includes a spring piece portion for being clamped in the clamping slot, and by providing the spring piece portion, when the gripping accessory and the assembly part are docked, a prompt sound can be generated by the deformation of the spring piece portion, so that the operator can understand whether the plug-in is successful.

[0054] Please combine Figure 4 and Figure 6 In order to facilitate the insertion of the gripping accessory 20 and the assembly portion 3141 and improve the docking speed, in an optional embodiment, the gripping accessory 20 can be set as an integral structure, specifically, the gripping accessory 20 includes a fixing ring 23 and a plurality of gripping members 21 fixed on the fixing ring 23 along the circumference of the fixing ring 23. The insertion groove 22 is formed on the fixing ring 23. See Figure 4 and Figure 5 In one embodiment, the gripping member 21 adopts a clamping structure, and the gripping member 21 includes a first clamping piece 211 and a second clamping piece 212 that are relatively pivotally connected, and an elastic member 213 disposed between the first clamping piece 211 and the second clamping piece 212, and the first clamping piece 211 is fixed on the fixing ring 23. In this embodiment, the rear end surface of the first clamping piece 211 is fixed on the fixing ring 23. In other embodiments, the gripping member 21 can also be fixed on the fixing ring 23 by a rod body or the like.

[0055] In the above embodiment, the first clamping sheet 211 and the second clamping sheet 212 are used to clamp tissues in a sheet-like structure. Figure 6 and Figure 7The first clamping piece 211 has a plurality of first comb teeth 214 for clamping and piercing tissues, and the second clamping piece 212 has a plurality of second comb teeth 215 for clamping and piercing tissues. The first comb teeth 214 and the second comb teeth 215 are arranged alternately. Since the gripping member 21 can penetrate into the tissue, the tissue is fixed more firmly. In order to further improve the firmness, the first comb teeth 214 and the second comb teeth 215 are provided with a plurality of barbs (not numbered).

[0056] In addition to setting the gripping member 21 as a clip, of course, the gripping member 21 can also be other structures, such as an elastic clip formed by folding an elastic material, wherein the elastic clip has folding arms arranged opposite to each other and clamping parts formed by bending and extending from the free ends of the folding arms, one of the folding arms is fixed on the fixed ring, and the other folding arm is a movable part. After the two folding arms are closed, they are clamped to each other by the two clamping parts to maintain the closed state. The elastic member can be a shrapnel clip made of titanium alloy. For another example, the gripping member includes a plurality of hooks formed on the fixed ring, and the plurality of hooks are arranged along the circumference of the fixed ring. The hook is a curved hook, and more than two curved hooks can be formed on each gripping member, so that the force on the grasped tissue can be dispersed to prevent the grasped tissue from being torn. A plurality of barbs can be formed on the curved hook.

[0057] In another optional embodiment, the gripping accessory includes a plurality of independently arranged gripping members, each of which is formed with a plug-in portion or a plug-in slot for plugging with the assembly member. Figure 8 The gripping member 21 may adopt a clamping structure, and the gripping member 21 includes a first clamping piece 211 and a second clamping piece 212 that are relatively pivotally connected, and an elastic member 213 disposed between the first clamping piece 211 and the second clamping piece 212. An inserting groove is formed on the force-applying portion of the first clamping piece 211 and the force-applying portion of the second clamping piece 212. Of course, in other embodiments, an inserting groove may be formed only on the first clamping piece or the second clamping piece, or an inserting portion may be provided on the first clamping piece and / or the second clamping piece, so that, correspondingly, an inserting groove is provided on the assembly part. It should be noted that the first clamping piece and the second clamping piece may have comb teeth and barbs.

[0058] In addition, the gripping member may also be composed of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, and the plug-in portion or the plug-in slot is formed on the protrusion; or the gripping member includes a plurality of hooks and a protrusion on one end forming the hook, and the plug-in portion or the plug-in slot is formed on the protrusion. There may be a plurality of hooks, and barbs may be formed on the hooks.

[0059] The specific scheme of the gripping attachment and the assembly part adopting the hanging method is: the gripping attachment includes a plurality of independently arranged gripping parts, and the assembly part and the gripping part are connected by hanging. In this embodiment, a hook portion is provided on one of the assembly part and the gripping part, and a hook ring cooperating with the hook portion is provided on the other. The gripping structure can adopt the following three structures.

[0060] In the first optional structure, the gripping member is a clamp, specifically, the gripping member includes a first clamping piece and a second clamping piece that are relatively pivotally connected, and an elastic member disposed between the first clamping piece and the second clamping piece. When the assembly member is a hook portion, a hook ring is disposed on the first clamping piece, and the hook ring can be an annular body disposed below the force-applying portion of the first clamping piece, or a hole-shaped structure formed by penetrating the force-applying portion. In order to make the fixed tissue more firmly, the first clamping piece and the second clamping piece can have comb teeth and barbs.

[0061] In a second optional structure, the gripping member is an elastic clip formed by folding an elastic material. The elastic clip has two folding arms arranged opposite to each other and a clamping portion formed by bending and extending from the free ends of the two folding arms. The hook ring is formed by surrounding the two folding arms. The elastic member can be a spring clip made of titanium alloy. The hook ring can be a ring portion formed on the outside of one of the folding arms, or a ring portion formed on the outside (below) of the connection between the two folding arms.

[0062] In a third optional structure, the gripping member includes a hook portion and an extension portion extending from one side of the hook portion, and a hook ring is formed on the extension portion. The hook portion can be a plurality of hook portions arranged in a circumferential direction, and a barb can be formed on the hook portion.

[0063] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0064] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A circular stapler, characterized in that: include: The stapler body includes a staple cartridge cylinder assembly; A nail anvil assembly, which can move relative to the nail magazine cylinder assembly to achieve closure; and A gripping attachment, used for gripping a component on one side of the stapler body; Wherein, the nail magazine cylinder assembly includes an annular magazine body, an annular cutting knife arranged inside the annular magazine body and at least two assembly parts arranged inside the annular cutting knife, and the grasping attachment is installed on the assembly parts.

2. The circular stapler according to claim 1, characterized in that: The gripping accessory comprises a plurality of independently arranged gripping members, and the assembly member is connected to the gripping members by hanging.

3. The circular stapler according to claim 3, characterized in that: One of the assembling part and the grasping part is provided with a hook part, and the other one is provided with a hook ring matched with the hook part.

4. The circular stapler according to claim 1, characterized in that: The gripping member comprises a first clamping piece and a second clamping piece which are relatively pivotally connected, and an elastic member arranged between the first clamping piece and the second clamping piece; or, The gripping member is an elastic clip formed by folding an elastic material; or, The gripping member includes a hook portion and an extending portion extending from one side of the hook portion, and the hook ring is formed on the extending portion.

5. The circular stapler according to claim 1, characterized in that: One of the assembly part and the grasping accessory is formed with an inserting portion, and the other is provided with an inserting groove for matching with the inserting portion.

6. The circular stapler according to claim 5, characterized in that: The plug-in slot is formed on the gripping accessory, and has a clamping cavity for clamping connection with the plug-in portion and an opening extending from the clamping cavity toward the plugging direction and passing through the gripping accessory, wherein the opening width of the opening is smaller than the inner diameter of the clamping cavity.

7. The circular stapler according to claim 6, characterized in that: The plug-in slot is a T-shaped slot, the plug-in portion is a T-shaped block that matches the plug-in slot, one of the assembly part and the matching portion is provided with a clamping portion, and the other is provided with a holding slot that docks with the clamping portion, and the clamping portion docks with the clamping slot to lock the plug-in portion and the plug-in slot.

8. The circular stapler according to claim 7, characterized in that: The clamping portion includes a spring portion for clamping in the clamping groove.

9. The circular stapler according to claim 5, characterized in that: The gripping attachment comprises a fixing ring and a plurality of gripping members fixed on the fixing ring along the circumference of the fixing ring, the gripping members comprise a first clamping piece and a second clamping piece relatively pivotally connected, and an elastic member arranged between the first clamping piece and the second clamping piece, the first clamping piece being fixed on the fixing ring; or, The gripping member is an elastic clip formed by folding an elastic material; or, The gripping member includes a plurality of hooks formed on the fixing ring.

10. The circular stapler according to claim 5, characterized in that: The gripping accessory comprises a plurality of independently arranged gripping members, each of which is formed with a plug-in portion or a plug-in slot for plugging with the assembly member, the gripping member comprises a first clamping piece and a second clamping piece pivotally connected relative to each other, and an elastic member arranged between the first clamping piece and the second clamping piece, the plug-in portion or the plug-in slot being formed on the first clamping piece and / or the second clamping piece; or, The gripping member is composed of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, and the plug-in portion or the plug-in groove is formed on the protrusion; or, The gripping member includes a plurality of hooks and a protrusion formed on one end of the hook, and the inserting portion or the inserting groove is formed on the protrusion.

11. The circular stapler according to claim 1, characterized in that: The assembly part comprises an assembly part for mounting the gripping attachment and a connecting part for fixing the assembly part on the annular warehouse body; The annular cutting knife has a blade portion, and an avoidance groove extending along the blade-out direction of the annular cutting knife is formed on the annular cutting knife, a distance is formed between the avoidance groove and the blade portion, and the connecting portion passes through the avoidance groove.

12. The staple cartridge barrel assembly according to claim 11, characterized in that: The annular cutting knife is defined as having a first position before firing and a second position after firing; After the grasping attachment is installed on the assembly part, the position of the portion of the grasping attachment that fixes the tissue is higher than the position of the blade of the annular cutting knife when it is in the first position, and lower than or equal to the suturing surface.

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