Circular stapler

Abstract

The application relates to a circular anastomat, comprising: an anastomat body comprising a cartridge cylinder assembly; an anvil assembly movable relative to the cartridge cylinder assembly to achieve closure; and a gripping accessory for gripping the components on one side of the anastomat body; wherein the 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 fittings arranged on the inner side of the annular cutting knife, and the gripping accessory is mounted on the fittings. By using the circular anastomat of the application, as much healthy tissue as possible can be reserved during surgery. Specifically, after the gripping accessory grips the tissue on one side of the anastomat body, the gripping accessory is fixed on the anastomat body to achieve fixation of the tissue on one side of the anastomat body, so that the tissue on one side of the anastomat body does not need to be sutured with a purse, thereby reducing the length of the cut tissue on one side of the anus, and the application is especially suitable for low rectal cancer surgery and can achieve the anastomosis and anus-preserving effect of low rectal cancer.

Description

Technical Field

[0001] This invention relates to the field of medical devices, and more specifically, to a circular stapler. Background Technology

[0002] Current low rectal cancer surgeries typically use a circular stapler to suture the two severed segments together. During the procedure, a purse-string suture technique is used to fix the two severed segments to the anvil assembly and the stapler body respectively. The stapler is then closed and fired to suture the two severed tissue segments together. During this suture, the purse-string sutured tissue is removed. However, as is known in the industry, healthy tissue at the anus is scarce in low rectal cancer surgeries. Therefore, preserving as much healthy tissue as possible is a pressing issue that needs to be addressed in the field. Summary of the Invention

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

[0004] To achieve the above objectives, the present invention provides the following technical solution: a circular anastomosis device, comprising:

[0005] The stapler body includes the staple cartridge assembly;

[0006] The anvil assembly is movable relative to the staple cartridge assembly to achieve closure; and

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

[0008] The staple cartridge assembly includes an annular cartridge, an annular cutting blade disposed inside the annular cartridge, and at least two fittings disposed inside the annular cutting blade, wherein the gripping attachment is mounted on the fittings.

[0009] Furthermore, the gripping accessory includes several independently configured gripping components, and the accessory is connected to the gripping components by a hook-and-hold connection.

[0010] Furthermore, one of the mounting parts and gripping parts is provided with a hook portion, and the other is provided with a hook ring that cooperates with the hook portion.

[0011] Furthermore, the gripping member includes a first clamping piece and a second clamping piece that are pivotally connected to each other, and an elastic member disposed between the first clamping piece and the second clamping piece; or,

[0012] The gripper is an elastic clamp formed by folding an elastic material; or...

[0013] The gripper includes a hook and an extension extending from one side of the hook, the hook being formed on the extension.

[0014] Furthermore, one of the assembly or gripping attachments has a plug-in portion, and the other has a plug-in groove for engaging with the plug-in portion.

[0015] Furthermore, the insertion groove is formed on the gripping attachment, the insertion groove having a locking cavity for locking connection with the insertion part and an opening extending from the locking cavity in the insertion direction and through the gripping attachment, the opening width of the opening being smaller than the inner diameter of the locking cavity.

[0016] Furthermore, the insertion slot is a T-shaped slot, the insertion part is a T-shaped block that mates with the insertion slot, one of the assembly parts and the mating part is provided with a snap-fit ​​part, and the other is provided with a snap-fit ​​groove that mates with the snap-fit ​​part. The snap-fit ​​part mates with the snap-fit ​​groove to lock the insertion part and the insertion slot.

[0017] Furthermore, the snap-fit ​​portion includes a spring clip portion for snapping into the snap-fit ​​groove.

[0018] Furthermore, the gripping attachment includes a fixing ring and a plurality of gripping members fixed circumferentially to the fixing ring. Each gripping member includes a first clamping piece and a second clamping piece pivotally connected to each other, and an elastic member disposed between the first and second clamping pieces. The first or second clamping piece is fixed to the fixing ring; or,

[0019] The gripper is an elastic clamp formed by folding an elastic material; or...

[0020] The gripping element includes a plurality of hooks formed on the retaining ring.

[0021] Furthermore, the gripping accessory includes a plurality of independently disposed gripping members, each gripping member having a plug-in portion or plug-in groove for inserting and engaging with the assembly. Each gripping member includes a first clamping plate and a second clamping plate pivotally connected to each other, and an elastic member disposed between the first clamping plate and the second clamping plate. The first clamping plate and / or the second clamping plate has the plug-in portion or plug-in groove formed thereon; or,

[0022] The gripper consists of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, with the insertion portion or insertion groove formed on the protrusion; or...

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

[0024] The annular cutting blade has a cutting edge and an avoidance groove extending along the cutting direction of the annular cutting blade is formed on the annular cutting blade. A gap is formed between the avoidance groove and the cutting edge, and the connecting part passes through the avoidance groove.

[0025] Furthermore, the annular cutting blade is defined with a first position before firing and a second position after firing;

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

[0027] The beneficial effects of this invention are as follows: by using the circular stapler of this application, as much healthy tissue as possible can be preserved during surgery. Specifically, after the tissue on one side of the stapler body is grasped by the grasping attachment, the grasping attachment is fixed to the stapler body to fix the tissue on one side of the stapler body. Thus, the stapler body does not need to be purse-string sutured on one side, thereby reducing the length of tissue cut on the anal side. This is especially suitable for low rectal cancer surgery, achieving an anal preservation effect in low rectal cancer anastomosis and helping to improve the quality of surgery.

[0028] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0029] Figure 1 This is a partial structural schematic diagram of a circular anastomosis device according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 Partial exploded view of the structure shown;

[0031] Figure 3 for Figure 1 The diagram shows the structure of the gripping attachment and the staple cartridge assembly during assembly.

[0032] Figure 4 for Figure 1 A schematic diagram of the structure of the gripping attachment;

[0033] Figure 5 for Figure 4 A schematic diagram of the gripper structure in the middle;

[0034] Figure 6 This is a structural schematic diagram of the second type of gripping attachment used in this application;

[0035] Figure 7 for Figure 6A schematic diagram of the gripper structure in the middle;

[0036] Figure 8 This is a structural diagram of the third type of gripping attachment used in this application. Detailed Implementation

[0037] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of the present invention, it should be noted that unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the technical features involved in the different embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Please see Figures 1 to 3 The circular stapler shown in one embodiment of this application includes a stapler body, an anvil assembly 10 disposed opposite to the stapler body, and a detachable gripping attachment 20 mounted on the stapler body. The stapler body includes a rod assembly (not shown), a staple cartridge assembly 31 mounted on one end of the rod assembly, and a gripping assembly (not shown) mounted on the other end of the rod assembly. In this embodiment, the rod assembly and gripping assembly employ existing technology and will not be described in detail here.

[0039] The staple cartridge assembly 31 is generally similar to the existing technology in structure. Specifically, the structure similar to the existing structure includes a cylindrical shell 311 mounted on the rod assembly, an annular cartridge 312 disposed within the cylindrical shell 311, a plurality of staples (not shown) disposed within the annular cartridge 312, a plurality of staple pushers (not shown) for moving the staples, and an annular cutter 313 disposed inside the annular cartridge 312. The difference between the staple cartridge assembly 31 of this embodiment and the existing technology is that the staple cartridge assembly 31 also includes a plurality of fittings 314 disposed inside the annular cutter 313. The number of fittings 314 may also be two or other numbers, depending on the specific circumstances.

[0040] The anvil assembly 10 is used to mate with a docking rod (not shown) within the staple cartridge assembly 31, and it is movable relative to the staple cartridge assembly 31 to achieve closure. The structure of this anvil assembly 10 is the same as that of prior art anvil assemblies, and will not be described in detail therein. It should be noted that during surgery, the tissue on the side of the anvil assembly 10 is sutured using a purse-string suture technique.

[0041] The gripping attachment 20 is used to grip one side of the staple cartridge assembly 31. Specifically, the gripping attachment 20 is provided with several gripping elements 21, which are fixed to the severed tissue. During the operation, the gripping attachment 20 first grips the tissue on one side of the staple cartridge assembly 31, and then the gripping attachment 20 is installed on the mounting accessory 314.

[0042] By using the circular stapler of this application, as much healthy tissue as possible can be preserved during surgery. Specifically, after the tissue on one side of the stapler body is grasped by the grasping attachment 20, the grasping attachment 20 is fixed to the stapler body to fix the tissue on one side of the stapler body. Thus, the stapler body side does not need to be purse-string sutured. This reduces the length of tissue cut on the anal side, which is especially suitable for low rectal cancer surgery, achieving an anal preservation effect in low rectal cancer anastomosis and improving the quality of surgery.

[0043] It should be noted that the radius of the stapler body (excluding the size of the connecting rod) of the circular stapler used in low rectal cancer surgery is usually 17mm, of which 3-5mm is the length occupied by the suture surface and the remaining 12-14mm is the length occupied by the central cavity of the stapler body. In the purse-string suture technique used in the prior art, the severed tissue usually needs to retain about 5mm of the outer segment. During the operation, the severed tissue is stretched on the stapler body. After the stapler is closed, cut and sutured, the tissue stretched on the central cavity and the outer segment are removed. That is, the expected length of tissue to be removed in the current operation is 17-19mm.

[0044] When using the circular stapler of this application, the tissue removed during surgery is less than 17-19 mm. Specifically, the gripper 21 is fixed on the severed tissue, and the distance between the part of the gripper 21 that grips and fixes the tissue and the severed surface of the tissue is approximately (not exceeding) 5 mm. When the gripper attachment 20 is installed on the assembly 314, the distance between the part of the gripper 21 that grips and fixes the tissue and the inner edge of the suture surface 3121 is approximately within 3 mm. The tissue at the above two distances is the part to be cut during surgery. Thus, the length of tissue removed using the circular stapler of this application is approximately (not exceeding) 8 mm, which is much smaller than the length of tissue removed by the purse-string suture technique, and is therefore particularly suitable for low rectal cancer surgery.

[0045] Please combine Figures 2 to 4 In this embodiment, the assembly 314 includes an assembly portion 3141 for mounting the gripping attachment 20 and a connecting portion (not labeled) for fixing the assembly portion 3141 to the annular housing 312. To prevent the assembly 314 from affecting the movement and cutting of the annular cutting blade 313, in this embodiment, a plurality of clearance grooves 3131 are formed on the annular cutting blade 313. Specifically, the annular cutting blade 313 has a cutting edge portion 3132, and clearance grooves 3131 extending along the cutting direction of the annular cutting blade 313 are formed on the annular cutting blade 313. A gap is formed between the clearance grooves 3131 and the cutting edge portion 3132, and the connecting portion passes through the clearance grooves 3131 to connect the assembly portion 3141 and the side wall of the annular housing 312.

[0046] In order to minimize the length of the tissue being cut, in this embodiment, the annular cutting blade 313 is defined in a first position before firing. Figure 3 The gripping attachment 20 is positioned as shown in the diagram, and in the second position after firing. After the gripping attachment 20 is mounted on the assembly 314, the position of the tissue-fixing portion of the gripping attachment 20 is higher than the position of the blade 3132 when the annular cutter 313 is in the first position, and lower than or equal to the suture surface 3121. Typically, the distance between the position of the tissue-fixing portion of the gripping attachment 20 and the position of the blade 3132 is 0.5 mm. With this arrangement, and considering 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 tissue-fixing portion of the gripper 21 and the inner edge of the suture surface 3121 is approximately within 3 mm.

[0047] As mentioned above, the gripping attachment 20 is installed on the assembly 314. In order to facilitate the installation of the gripping attachment 20 onto the assembly 314, the gripping attachment 20 and the assembly 314 can be connected by plugging or by hanging. The above two methods will be described in detail later.

[0048] Please combine Figures 3 to 5 One of the assembly 314 and the gripping attachment 20 has a plug-in part, and the other has a plug-in groove 22 for cooperating with the plug-in part. The plug-in connection of the assembly 314 and the gripping attachment 20 is realized through the plug-in part and the plug-in groove 22.

[0049] In one embodiment, the assembly part 3141 is a plug-in part 3141, and the plug-in groove 22 is formed on the gripping attachment 20. The plug-in groove 22 has a locking cavity 221 for locking connection with the plug-in part 3141 and an opening 222 extending from the locking cavity 221 in the plugging direction and penetrating the gripping attachment 20. The opening width of the opening 222 is smaller than the inner diameter of the locking cavity 221.

[0050] In another embodiment, the insertion slot is a T-slot, and the insertion part is a T-shaped block that mates with the insertion slot. One of the assembly parts and the mating part is provided with a snap-fit ​​part, and the other is provided with a snap-fit ​​groove that mates with the snap-fit ​​part. The snap-fit ​​part and the snap-fit ​​groove mate to lock the insertion part and the insertion slot. The snap-fit ​​part includes a spring piece for holding the attachment in the snap-fit ​​groove. By providing the spring piece, when the attachment and the assembly are mated, a sound generated by the deformation of the spring piece can be used to emit a prompt sound, so that the operator can know whether the mating is successful.

[0051] Please combine Figure 4 and Figure 6 To facilitate the insertion of the gripping attachment 20 into the assembly part 3141 and improve the docking speed, in an optional embodiment, the gripping attachment 20 can be configured as an integral structure. Specifically, the gripping attachment 20 includes a retaining ring 23 and a plurality of gripping members 21 fixed circumferentially to the retaining ring 23. An insertion groove 22 is formed on the retaining ring 23. Please refer to [link / reference]. Figure 4 and Figure 5 In one embodiment, the gripper 21 employs a clamping structure, comprising a first clamping piece 211 and a second clamping piece 212 pivotally connected to each other, and an elastic member 213 disposed between the first clamping piece 211 and the second clamping piece 212. The first clamping piece 211 is fixed to a retaining ring 23. In this embodiment, the rear end face of the first clamping piece 211 is fixed to the retaining ring 23. In other embodiments, the gripper 21 can also be fixed to the retaining ring 23 by means of a rod-like portion.

[0052] In the above embodiments, the portions of the first clamping piece 211 and the second clamping piece 212 used to clamp tissue are sheet-like structures. In another embodiment, please refer to... Figure 6 and Figure 7The first clamping piece 211 has a plurality of first comb teeth 214 for clamping and inserting into tissue, and the second clamping piece 212 has a plurality of second comb teeth 215 for clamping and inserting into tissue, the first comb teeth 214 and the second comb teeth 215 being arranged alternately. Because this type of gripper 21 can insert into tissue, it fixes tissue more firmly. To further improve the firmness, the first comb teeth 214 and the second comb teeth 215 are provided with a plurality of barbs (not labeled).

[0053] Besides setting the gripper 21 as a clamp, it can also be of other structures, such as an elastic clamp formed by folding an elastic material. This elastic clamp has opposing folding arms and retaining portions extending from the free ends of the folding arms. One folding arm is fixed to a fixing ring, and the other folding arm is movable. After the two folding arms are closed, they are held in place by the two retaining portions. This elastic element can be a spring clip made of titanium alloy. Alternatively, the gripper may include several hooks formed on the fixing ring, arranged circumferentially around the fixing ring. These hooks are curved, and each gripper can have two or more curved hooks, thus dispersing the force on the gripped tissue and preventing tearing. Several barbs can be formed on these curved hooks.

[0054] In another alternative embodiment, the gripping accessory includes a plurality of independently disposed gripping members, each gripping member having a plug-in portion or plug-in slot that engages with the assembly. Please refer to Figure 8 The gripper 21 can adopt a clamping structure, comprising a first clamping piece 211 and a second clamping piece 212 pivotally connected to each other, and an elastic member 213 disposed between the first clamping piece 211 and the second clamping piece 212. Insertion grooves are formed on the force-applying portions of the first clamping piece 211 and the second clamping piece 212. Alternatively, in other embodiments, insertion grooves may be formed only on the first or second clamping piece, or insertion portions may be provided on both the first and / or second clamping pieces, thus correspondingly providing insertion grooves on the assembly. It should be noted that the first and second clamping pieces may have comb teeth and barbs.

[0055] Alternatively, the gripper may consist of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, with a connector or slot formed on the protrusion; or, the gripper may include a plurality of hooks and a protrusion on one end of each hook, with a connector or slot formed on the protrusion. There may be multiple hooks, and barbs may be formed on the hooks.

[0056] The specific scheme for using a hanging method to grip the attachments and components is as follows: the gripping attachments include several independently set gripping parts, and the components and gripping parts are connected by hanging. In this embodiment, one of the components and gripping parts is provided with a hook portion, and the other is provided with a hook ring that cooperates with the hook portion. This gripping structure can adopt the following three structures.

[0057] In the first alternative structure, the gripper is a clamp, specifically comprising a first clamping plate and a second clamping plate pivotally connected to each other, and an elastic member disposed between the first and second clamping plates. When the assembly is a hook portion, a hook ring is disposed on the first clamping plate. This hook ring can be a ring-shaped body arranged below the force-applying portion of the first clamping plate, or it can be a hole-like structure penetrating the force-applying portion. To make the fixation of the tissue more secure, the first clamping plate and the second clamping plate can have comb teeth and barbs.

[0058] The second alternative structure involves a gripper formed by folding a resilient material. The gripper has two opposing folded arms and retaining portions extending from the free ends of each arm by bending relative to each other. A hook is formed around the two folded arms. The resilient element can be a spring clip made of titanium alloy. The hook can be a loop formed on the outside of one of the folded arms, or a loop formed on the outside (below) of the junction of the two folded arms.

[0059] A third alternative structure includes a gripper comprising a hook and an extension extending from one side of the hook, the hook being formed on the extension. The hook may be a plurality of hooks arranged circumferentially, and barbs may be formed on the hook.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0061] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A circular stapler, characterized in that, include: The stapler body includes the staple cartridge assembly; The anvil assembly is movable relative to the staple cartridge assembly to achieve closure; and A gripping attachment for gripping tissue on one side of the stapler body; The staple cartridge assembly includes an annular cartridge, an annular cutting blade disposed inside the annular cartridge, and at least two fittings disposed inside the annular cutting blade. In use, after gripping the tissue on one side of the stapler body with the gripping attachment, the gripping attachment is installed on the fittings to fix the tissue on one side of the stapler body. The annular cutting blade is defined by a first position before firing and a second position after firing. After the gripping attachment is installed on the assembly, the position of the part of the gripping attachment that fixes the tissue is higher than the position of the blade of the annular cutter when it is in the first position, and lower than or equal to the suture surface.

2. The circular anastomosis device as described in claim 1, characterized in that, The gripping accessory includes several independently configured gripping components, and the accessory is connected to the gripping components by a hook-and-hold connection.

3. The circular anastomosis device as described in claim 2, characterized in that, One of the components and gripping parts is provided with a hook portion, and the other is provided with a hook ring that cooperates with the hook portion.

4. The circular anastomosis device as described in claim 2, characterized in that, The gripping element includes a first gripping piece and a second gripping piece that are pivotally connected to each other, and an elastic member disposed between the first gripping piece and the second gripping piece; or... The gripper is an elastic clamp formed by folding an elastic material; or... The gripping member includes a hook and an extension extending from one side of the hook, the hook being formed on the extension.

5. The circular anastomosis device as described in claim 1, characterized in that, One of the assembly and gripping attachments has a plug-in portion, and the other has a plug-in groove for engaging with the plug-in portion.

6. The circular anastomosis device as described in claim 5, characterized in that, The insertion groove is formed on the gripping attachment. The insertion groove has a locking cavity for locking with the insertion part and an opening extending from the locking cavity in the insertion direction and through the gripping attachment. The opening width of the opening is smaller than the inner diameter of the locking cavity.

7. The circular stapler as described in claim 6, characterized in that, The insertion slot is a T-shaped slot, and the insertion part is a T-shaped block that mates with the insertion slot. One of the assembly parts and the mating parts is provided with a snap-fit ​​part, and the other is provided with a snap-fit ​​groove that mates with the snap-fit ​​part. The snap-fit ​​part mates with the snap-fit ​​groove to lock the insertion part and the insertion slot.

8. The circular anastomosis device as described in claim 7, characterized in that, The snap-fit ​​portion includes a spring clip portion for holding the snap-fit ​​groove.

9. The circular anastomosis device as described in claim 5, characterized in that, The gripping attachment includes a fixing ring and a plurality of gripping elements fixed circumferentially to the fixing ring. Each gripping element includes a first clamping piece and a second clamping piece pivotally connected to each other, and an elastic element disposed between the first and second clamping pieces. The first clamping piece is fixed to the fixing ring; or... The gripper is an elastic clamp formed by folding an elastic material; or... The gripping element includes a plurality of hooks formed on the retaining ring.

10. The circular anastomosis device as described in claim 5, characterized in that, The gripping attachment includes a plurality of independently arranged gripping members, each gripping member having a plug-in portion or plug-in groove that engages with the assembly. Each gripping member includes a first clamping plate and a second clamping plate pivotally connected to each other, and an elastic member disposed between the first and second clamping plates. The first and / or second clamping plates have the plug-in portion or plug-in groove formed thereon; or... The gripper consists of an elastic clip formed by folding an elastic material and a protrusion formed on the elastic clip, with the insertion portion or insertion groove formed on the protrusion; or... The gripping member includes a plurality of hooks and a protrusion formed on one end of the hooks, and the insertion portion or insertion groove is formed on the protrusion.

11. The circular stapler as described in claim 1, characterized in that, The assembly includes an assembly part for mounting the gripping attachment and a connecting part for fixing the assembly part to the annular chamber body; The annular cutting blade has a cutting edge and an avoidance groove extending along the cutting direction of the annular cutting blade is formed on the annular cutting blade. A gap is formed between the avoidance groove and the cutting edge, and the connecting part passes through the avoidance groove.

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