A staple cartridge assembly, anvil assembly, end effector, and surgical instrument

Abstract

The application discloses a kind of nail bin assemblies, nail anvil assemblies, end effector and surgical instruments capable of releasing support layer in advance, with the effect of releasing support layer in advance, even if firing member cannot reach the distal end, the support layer released in advance will not affect the jaw opening of nail bin and anvil, the support layer can be separated from the instrument and stay on the tissue, avoiding the defect that the tissue is damaged due to pulling.

Description

Technical Field

[0001] This invention relates to the field of surgical instrument technology, and in particular to a staple cartridge assembly, anvil assembly, end effector, and surgical instrument capable of prematurely releasing a support layer. Background Technology

[0002] Linear clamping, cutting, and anastomosis surgical instruments can be used in surgical procedures to remove tissue. Traditional linear clamping, cutting, and anastomosis surgical instruments include a handle assembly, an elongated body, and an end effector. The end effector includes a firing member, a cartridge, and an anvil. The cartridge and anvil form a clamp structure to grasp the tissue to be manipulated. The cartridge contains multiple anastomotic staples arranged in at least two transverse rows. When the firing member drives the actuator block of the cartridge to move, the anastomotic staples are ejected from the cartridge. The anastomotic staples ejected from the cartridge are defined by the anvil to shape the surface of the staple legs.

[0003] During surgery, it is often necessary to reinforce the anastomosis sutures to prevent tissue tearing. In existing techniques, biocompatible fabric reinforcement materials (buttresses), also known as supports or support layers, are temporarily fixed to the working surfaces of the staple cartridge and anvil. Supports or support layers can be used to distribute compressive clamping forces across the tissue, remove excess fluid from the tissue, and / or improve staple grip. The material sheets of the supports or support layers are bioabsorbable, biodegradable, and / or soluble, allowing the material sheets to be absorbed, decomposed, and / or dissolved during the healing process.

[0004] Chinese invention patent document CN105105807A discloses a surgical anastomosis device. The staple cartridge assembly includes a staple cartridge support, which is operably fixed to the upper surface of the staple cartridge via sutures "S1, S2". The first suture S1 is distal, and the second suture S2 is proximal. The anvil assembly includes an anvil support, which is operably fixed to the bottom surface of the anvil plate via anchors "S3, S4". Anchor S3 is distal, and anchor S4 is proximal.

[0005] The first suture S1 and the second suture S2 are independent of each other. The surgical cartridge support can only be fully released when the firing component cuts the first suture "S1" at the distal end.

[0006] The anchor S3 is placed horizontally on the distal end of the anvil support. The distal end of the anvil support can only be released when the firing component cuts the anchor S3 at the distal end.

[0007] In unforeseen circumstances, when the firing mechanism fails to continue firing, it cannot reach the distal end, the support remains fixed to the cartridge / anvil, and the distal jaws cannot open. Forcibly opening the cartridge and anvil can easily damage tissue due to the pulling force from the support and the jaws of the end effector.

[0008] In view of this, it is necessary to provide a staple cartridge assembly, anvil assembly, end effector, and surgical instrument that can release the support layer in advance. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and provide a staple cartridge assembly, anvil assembly, end effector, and surgical instrument capable of releasing the support layer in advance.

[0010] The present invention provides a staple cartridge assembly, including a staple cartridge base, a staple cartridge installed in the staple cartridge base, and a staple cartridge support layer on the working surface of the staple cartridge; The staple cartridge support layer is fixed to the working surface of the staple cartridge by a fixing mechanism; The fixing mechanism includes a proximal fixing part, a distal fixing part, and a fixing part connecting part connected between the proximal fixing part and the distal fixing part; The distal fixing part is released from fixing through the fixing part connecting part and the proximal fixing part in conjunction. The proximal end of the staple cartridge support layer is fixed to the proximal end of the staple cartridge by the proximal end fixing part, and the distal end of the staple cartridge support layer is fixed to the distal end of the staple cartridge by the distal end fixing part; When the proximal fixing part is released from the proximal end of the staple cartridge support layer, the distal fixing part is correspondingly released from the distal end of the staple cartridge support layer, and the distal end of the staple cartridge support layer is in a pre-released state.

[0011] In one of the alternative technical solutions, the fixing mechanism includes a staple cartridge binding wire; The proximal and distal ends of the staple cartridge support layer are fixed to the proximal and distal ends of the staple cartridge by the proximal and distal ends of the staple cartridge binding wire, respectively, and the middle connecting part of the staple cartridge binding wire is located on the outside of the staple cartridge base; Specifically, when the proximal end of the staple cartridge binding wire is cut, the staple cartridge binding wire is in a loose state, and the distal end of the staple cartridge binding wire releases the distal end of the staple cartridge support layer, thus the distal end of the staple cartridge support layer is in a pre-release state.

[0012] In one of the alternative technical solutions, after the proximal end of the staple cartridge binding wire is cut off, the end of the proximal end of the staple cartridge binding wire remains connected to the staple cartridge base or the proximal end of the staple cartridge, and the end of the distal end of the staple cartridge binding wire remains connected to the distal end of the staple cartridge.

[0013] In one of the alternative technical solutions, proximal fixing holes / grooves and proximal through holes / grooves are respectively provided on opposite sides of the proximal end of the staple cartridge base along the width direction of the staple cartridge base. The proximal end of the staple cartridge binding wire is connected to the proximal fixing hole / slot; The gap at the other end of the proximal end of the staple cartridge binding wire passes through the proximal end through-hole / groove.

[0014] In one of the alternative technical solutions, the staple cartridge and the staple cartridge base are detachably connected; The staple cartridge has outwardly protruding staple cartridge protrusions on opposite sides of its proximal end, and the proximal end fixing hole / groove and the proximal end through hole / groove are respectively provided on the staple cartridge protrusions.

[0015] In one alternative technical solution, the side plate of the staple cartridge base has an avoidance notch, and the staple cartridge protrusion is at least partially located in the avoidance notch.

[0016] In one of the alternative technical solutions, the staple cartridge and the staple cartridge base are integrally formed; The proximal fixing hole / slot and the proximal through hole / slot are respectively provided on the side plates on both sides of the staple cartridge base.

[0017] In one of the alternative technical solutions, a side plate groove extending from the proximal side to the distal side is provided on the outer surface of the side plate of the staple cartridge base, and the middle connecting part of the staple cartridge binding wire is fitted in the side plate groove.

[0018] In one of the alternative technical solutions, a distal fixing hole / groove is provided on one side of the distal end of the staple cartridge, and a distal sliding groove of the staple cartridge extending along the width direction is provided on the working surface of the distal end of the staple cartridge. The distal end of the staple cartridge binding wire is fitted with the distal end groove of the staple cartridge with a clearance, and the end of the distal end of the staple cartridge binding wire is connected to the distal end fixing hole / groove.

[0019] In one of the alternative technical solutions, the working surface at the distal end of the staple cartridge has a distal end inclined surface, and the distal end groove of the staple cartridge is disposed on the distal end inclined surface.

[0020] The present invention also provides an anvil assembly, including an anvil and an anvil support layer on the working surface of the anvil; The anvil support layer is constrained on the working surface of the anvil by a limiting mechanism; The limiting mechanism includes a proximal limiting part, a distal limiting part, and a limiting part connecting part between the proximal limiting part and the distal limiting part; The distal limiting part releases the restriction through the limiting part connecting part and the proximal limiting part in conjunction. The proximal end of the anvil support layer is restricted to the proximal end of the anvil by the proximal end restriction portion, and the distal end of the anvil support layer is restricted to the distal end of the anvil by the distal end restriction portion; When the proximal restricting portion is released from the proximal end of the anvil support layer, the distal restricting portion is correspondingly released from the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-released state.

[0021] In one of the alternative technical solutions, the limiting mechanism includes an anvil binding wire; The proximal and distal ends of the anvil support layer are respectively constrained on the proximal and distal ends of the anvil binding wire, and the middle connecting part of the anvil binding wire is located on the side or back of the anvil. Specifically, when the proximal end of the anvil binding wire is cut, the anvil binding wire is in a loose state, the distal end of the anvil binding wire releases the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-release state.

[0022] In one alternative technical solution, after the proximal end of the anvil binding wire is cut, the end of the proximal end of the anvil binding wire remains connected to the proximal end of the anvil, and the end of the distal end of the anvil binding wire remains connected to the distal end of the anvil.

[0023] The present invention also provides an anvil assembly, including an anvil, an anvil support layer on the working surface of the anvil, a proximal fastening mechanism for limiting the proximal end of the anvil support layer, and a distal fastening mechanism for limiting the distal end of the anvil support layer. The distal fastening mechanism includes a proximal fastening part, a distal fastening part, and a fastening part connecting part connected between the proximal fastening part and the distal fastening part. The distal fastening part is released from fastening through the fastening part connecting part in conjunction with the proximal fastening part. The distal end of the anvil support layer is fastened to the distal end of the anvil by the distal fastener; The proximal fastener is fastened to the dorsal side of the distal end of the anvil; When the proximal fastening part is released from the distal end of the anvil, the distal fastening part is correspondingly released from the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-released state.

[0024] In one of the alternative technical solutions, the remote fastening mechanism includes a remote binding wire; The distal binding suture includes a proximal segment, an intermediate connecting segment, and a distal segment connected in sequence; The ends of the proximal segment and the distal segment are connected to one side of the distal end of the anvil, and the intermediate connecting segment is located on the other side of the distal end of the anvil. The distal segment secures the distal end of the anvil support layer to the distal end of the anvil, and the proximal segment is located on the dorsal side of the distal end of the anvil. When the proximal segment is cut, the distal binding wire is in a loosened state, and the distal end of the anvil support layer is in a pre-released state.

[0025] In one alternative embodiment, after the proximal segment is severed, the ends of both the proximal and distal segments remain connected to the distal end of the anvil.

[0026] In one of the alternative technical solutions, a distal groove is provided on the working surface of the distal end of the anvil, a proximal groove is provided on the back side of the distal end of the anvil, and a transition groove connecting the distal groove and the proximal groove is provided on the side or back side of the anvil. The proximal slide, the transition slide, and the distal slide are connected in sequence in a U-shape or a C-shape; The proximal section is fitted with the proximal groove with a clearance, the intermediate connecting section is fitted with the transition groove with a clearance, and the distal section is fitted with the distal groove with a clearance.

[0027] In one alternative embodiment, the working surface at the distal end of the anvil has a second inclined surface, and the distal groove is disposed on the second inclined surface.

[0028] The present invention also provides an end effector, including a loading unit, a staple cartridge assembly, and a staple anvil assembly; The loading unit has a firing component; The staple cartridge assembly and the anvil assembly are respectively connected to the far end of the loading unit, and the staple cartridge assembly and the anvil assembly are capable of relative movement; Wherein, the staple cartridge assembly adopts the staple cartridge assembly described in any of the foregoing technical solutions, and / or, the anvil assembly adopts the anvil assembly described in any of the foregoing technical solutions.

[0029] The present invention also provides a surgical instrument, comprising a handle assembly, an elongated body, and an end effector as described above, which are sequentially operable from proximal to distal.

[0030] The present invention also provides a surgical instrument, including the staple cartridge assembly described in any of the foregoing technical solutions, and / or including the anvil assembly described in any of the foregoing technical solutions.

[0031] The above technical solution has the following beneficial effects: The staple cartridge assembly provided by this invention has a staple cartridge support layer fixed to the working surface of the staple cartridge by a fixing mechanism. When the proximal fixing part of the fixing mechanism releases the proximal end of the staple cartridge support layer, the distal fixing part is released from the fixation through the fixing part connecting part and the proximal fixing part. The distal fixing part is released from the distal end of the staple cartridge support layer, and the distal end of the staple cartridge support layer is in a pre-released state. Even if the firing component fails to reach the distal end due to an accident, the staple cartridge support layer will separate from the staple cartridge and remain on the tissue.

[0032] The anvil assembly provided by the present invention has an anvil support layer restricted to the working surface of the anvil by a restricting mechanism. When the proximal restricting part of the restricting mechanism releases the proximal end of the anvil support layer, the distal restricting part is released in conjunction with the proximal restricting part through the restricting part connecting part. The distal restricting part and the distal end of the anvil support layer are released, and the distal end of the anvil support layer is in a pre-released state. Even if the firing member fails to reach the distal end due to an accident, the anvil support layer will separate from the anvil and remain on the tissue.

[0033] The anvil assembly provided by this invention has a proximal end of the anvil support layer fastened to the proximal end of the anvil by a proximal end fastening mechanism, and a distal end of the anvil support layer fastened to the distal end of the anvil by a distal end fastening mechanism. The distal end of the anvil support layer is fastened by a distal fastening portion of the distal end fastening mechanism, which is located on the dorsal side of the distal end of the anvil and can be released before the distal fastening portion. When the proximal fastening portion is released from the distal end of the anvil, the distal fastening portion is released in conjunction with the proximal fastening portion through a fastening portion connecting portion, thus releasing the distal end of the anvil support layer. The distal end of the anvil support layer is in a pre-released state, meaning that even if the firing member fails to reach the distal end due to an accident, the anvil support layer will separate from the anvil and remain on the tissue.

[0034] The end effector and surgical instrument provided by the present invention, including the above-mentioned staple cartridge assembly and / or anvil assembly, has the effect of early release of the support layer. Even if the firing component cannot reach the distal end, the early release of the support layer will not affect the opening of the jaws of the staple cartridge and anvil. The support layer can be separated from the instrument and remain on the tissue, avoiding the defect of tissue damage caused by pulling. Attached Figure Description

[0035] The disclosure of this invention will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings: Figure 1 A schematic diagram of a surgical instrument provided according to an embodiment of the present invention; Figure 2 A schematic diagram of a surgical instrument provided according to another embodiment of the present invention; Figure 3 An exploded view of an end effector provided in an embodiment of the present invention; Figure 4 A perspective view of a staple cartridge assembly provided in an embodiment of the present invention from one viewpoint; Figure 5 A perspective view of a staple cartridge assembly provided in an embodiment of the present invention from another angle; Figure 6 This is an exploded view of a staple cartridge assembly provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the staple cartridge binding wire in a staple cartridge assembly provided in an embodiment of the present invention; Figure 8 This is an enlarged view of the proximal side of a staple cartridge assembly provided in an embodiment of the present invention; Figure 9 A magnified view of the distal side of a staple cartridge assembly provided in an embodiment of the present invention from a certain perspective; Figure 10 An enlarged view of the distal side of the staple cartridge assembly provided in an embodiment of the present invention from another perspective; Figure 11 A schematic diagram of a staple cartridge assembly provided in an embodiment of the present invention, wherein a proximal fixing hole / groove is provided on the side of the proximal end of the staple cartridge; Figure 12 A schematic diagram of a staple cartridge assembly provided in an embodiment of the present invention, wherein a proximal through hole / groove is provided on the side of the proximal end of the staple cartridge; Figure 13 A schematic diagram showing a staple cartridge assembly provided in an embodiment of the present invention, wherein a distal fixing hole / groove is provided on the side of the distal end of the staple cartridge; Figure 14 A perspective view of a staple cartridge assembly provided in another embodiment of the present invention from one viewpoint; Figure 15 A perspective view of the staple cartridge assembly provided in another embodiment of the present invention from another angle; Figure 16 This is a schematic diagram of the staple cartridge binding wire in a staple cartridge assembly provided in another embodiment of the present invention; Figure 17 An enlarged view of the proximal side of the staple cartridge assembly provided in another embodiment of the present invention; Figure 18 A schematic diagram of a staple cartridge assembly provided in another embodiment of the present invention, wherein a proximal fixing hole / groove is provided on the side plate of the staple cartridge base; Figure 19 A schematic diagram of a staple cartridge assembly provided in another embodiment of the present invention, wherein a proximal through hole / groove is provided on the side plate of the staple cartridge base; Figure 20 A perspective view of a nail and anvil assembly provided in an embodiment of the present invention; Figure 21 This is a top view of an anvil assembly provided in an embodiment of the present invention; Figure 22 This is a bottom view of an anvil assembly provided in an embodiment of the present invention; Figure 23 This is a perspective view of the anvil binding wire in an anvil assembly provided according to an embodiment of the present invention; Figure 24 A perspective view of a nail and anvil assembly provided in another embodiment of the present invention; Figure 25 An exploded view of an anvil assembly provided in another embodiment of the present invention; Figure 26 This is a schematic diagram of the distal binding wire in an anvil assembly provided in an embodiment of the present invention; Figure 27 A schematic diagram of a nail anvil assembly provided in an embodiment of the present invention, wherein a proximal sliding groove is provided on the back side of the nail anvil; Figure 28 A schematic diagram of a nail anvil assembly provided in an embodiment of the present invention, wherein the distal section of the distal binding wire is assembled in the distal slide groove; Figure 29 A schematic diagram of a nail and anvil assembly provided in an embodiment of the present invention, showing the intermediate connecting section of the distal binding wire assembled in a transition groove; Figure 30 A schematic diagram of a pin and anvil assembly provided in an embodiment of the present invention, wherein the proximal section of the distal binding wire is assembled in the proximal groove; Figure 31 A schematic diagram showing the firing mechanism positioned near the proximal end of the cartridge and anvil; Figure 32 This is a schematic diagram showing the firing mechanism located at the far side of the nail magazine and anvil. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0037] In the description of this 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. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] Furthermore, 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.

[0040] In various embodiments of the present invention, "distal / side" refers to the end of the surgical instrument that is far from the operator during operation, while "proximal / side" refers to the end / side of the surgical instrument that is close to the operator during operation.

[0041] The following is a specific embodiment of the surgical instrument. Generally, the surgical instruments described herein are endoscopic surgical cutting and anastomosis instruments. However, it should be noted that the surgical instruments can also be non-endoscopic surgical cutting and anastomosis instruments, such as open surgical instruments used in open surgery.

[0042] Specifically, Figure 1 The surgical instrument shown includes a handle assembly 40, an elongated body 50, and a disposable loading unit 30 detachably connected to the distal end of the elongated body 50, connected in sequence from proximal to distal end. In the surgical instrument provided in this embodiment, the end effector, consisting of the loading unit 30, the cartridge assembly 10, and the anvil assembly 20, can be completely disassembled and replaced.

[0043] The handle assembly 40 is adapted to allow an operator to manipulate the surgical instrument. The handle assembly 40, via its elongated body 50, controls the movement of the loading unit 30 for surgical operations, such as tissue clamping / closing, suturing / anastomosis, and cutting. The handle assembly 40 includes a handle body that can be held by a user in a conventional manner. In one embodiment, the surgical instrument operates the loading unit to close and fire via a button; in another embodiment, the surgical instrument can also operate the loading unit to close and fire via a push knob, trigger, or other means provided on the handle, enabling the loading unit 30 to perform cutting and suturing operations; in yet another embodiment, the surgical instrument can also operate the jaws of the loading unit 30 to open via a trigger, push knob, button, or other means provided on the handle assembly 40 to release tissue.

[0044] like Figure 1As shown, the slender body 50 is a tubular assembly that defines a longitudinal axis C; a firing lever (not shown) is disposed therein, the proximal end of which is connected to the output end of the drive mechanism in the handle assembly 40, and the distal end is connected to the firing member 33 of the loading unit 30, for transmitting the driving force of the drive mechanism to the firing member 33.

[0045] like Figure 1 As shown, the loading unit 30 includes a proximal body portion and a distal execution portion, which are connected. The distal execution portion includes a staple cartridge assembly 10 and an anvil assembly 20, which are movable relative to each other to close the jaws and clamp tissue. In one specific embodiment, the staple cartridge assembly 10 can be operably pivoted toward the anvil assembly 20 until the jaws of the loading unit 30 are closed to clamp tissue; and the staple cartridge assembly 10 can be operably pivoted toward a direction away from the anvil assembly 20 until the jaws of the loading unit 30 are opened to release tissue. As an alternative embodiment, the anvil assembly 20 of the loading unit 30 can be operably pivoted toward the staple cartridge assembly 10 until the jaws of the loading unit 30 are closed to clamp tissue; and the anvil assembly 20 can be operably pivoted toward a direction away from the staple cartridge assembly 10 until the jaws of the loading unit 30 are opened to release tissue.

[0046] like Figure 3 As shown, the loading unit 30 includes an outer tube 31, an inner tube 32 disposed within the outer tube 31, and a firing member 33 disposed within the inner tube 32. The inner tube 32 is formed by the mating of an upper shell 321 and a bottom shell 322. The firing member 33 is operatively associated with the cartridge assembly 10 and / or the anvil assembly 20 and is slidably arranged between the cartridge assembly 10 and the anvil assembly 20. The firing member 33 includes an elongated drive beam 331 having distal and proximal ends. The drive beam 331 may be made of a single sheet of material, or preferably of multiple laminated materials. The proximal end of the drive beam 331 of the firing member 33 includes a pair of resiliently engaged fingers for receiving a pusher. The pusher is sized and configured such that when the proximal end of the loading unit 30 engages with the elongated body 50 of the surgical instrument, the pusher mountably engages a drive component, such as a drive lever or control lever (not shown). The function of the control lever is to transmit axial movement from the handle assembly 40 to the firing member 33. The distal end of the drive beam 331 of the firing member 33 includes a head having a laterally extending upper portion, a laterally extending lower portion, and a central wall portion, the distal edge of which defines the blade 332. The anvil assembly 20 includes an anvil plate having a plurality of staple deformation pits / cavities (not shown) and a cover plate fixed to the top surface of the anvil plate, and also includes a longitudinal slot extending through the anvil plate to facilitate the passage of the central blade of the head.

[0047] For details regarding the structure, construction, and working principle of the handle assembly 40 and the elongated body 50, please refer to the existing technology, which does not relate to the inventive points of this case and will not be described in detail here.

[0048] Figure 2 The surgical instrument shown includes a handle assembly 40, an elongated body 50, and a cartridge assembly 10 and an anvil assembly 20 connected sequentially from proximal to distal. Both the cartridge assembly 10 and the anvil assembly 20 are operatively mounted at the distal end of the elongated body 50. The surgical instrument provided in this embodiment allows for the removal and replacement of the cartridge 12.

[0049] In the embodiments of the present invention, the fixing mechanism / restriction mechanism / fastening mechanism can release the corresponding support layer in advance. Specifically, when the fixing / restriction / fastening is released at the proximal end or proximal side of the fixing mechanism / restriction mechanism / fastening mechanism, the fixing / restriction / fastening is also released at the distal end or distal side of the fixing mechanism / restriction mechanism / fastening mechanism, and the distal end of the support layer is released in advance, and the support layer as a whole is in an advanced release state.

[0050] like Figure 3-6 and Figure 14-16 As shown, the staple cartridge assembly 10 provided in this embodiment of the invention includes a staple cartridge base 11, a staple cartridge 12 installed in the staple cartridge base 11, and a staple cartridge support layer 13 located on the working surface of the staple cartridge 12.

[0051] The staple cartridge support layer 13 is fixed to the working surface of the staple cartridge 12 by the fixing mechanism 14.

[0052] The fixing mechanism 14 includes a proximal fixing part, a distal fixing part, and a fixing part connecting part connected between the proximal fixing part and the distal fixing part.

[0053] The distal fixation part is released from fixation through the linkage between the fixation part connecting part and the proximal fixation part.

[0054] The proximal end 13a of the staple cartridge support layer 13 is fixed to the proximal end 12a of the staple cartridge 12 by the proximal end fixing part, and the distal end 13b of the staple cartridge support layer 13 is fixed to the distal end 12b of the staple cartridge 12 by the distal end fixing part.

[0055] When the proximal fixing part is released from the proximal end 13a of the staple cartridge support layer 13, the distal fixing part is correspondingly released from the distal end 13b of the staple cartridge support layer 13, and the distal end 13b of the staple cartridge support layer 13 is in a pre-released state.

[0056] The staple cartridge assembly 10 provided by the present invention is a component of an end effector or surgical instrument, which is used in conjunction with an anvil assembly. The staple cartridge assembly 10 includes a staple cartridge base 11, a staple cartridge 12, a staple cartridge support layer 13, and a fixing mechanism 14.

[0057] The staple cartridge base 11 has a U-shaped cross-section and includes a base plate and side plates 111. The staple cartridge 12 is used to receive staples. The staple cartridge 12 is installed in the staple cartridge base 11, with the proximal end 12a of the staple cartridge 12 located in the proximal end 11a of the staple cartridge base 11, and the distal end 12b of the staple cartridge 12 extending distal to the distal end 11b of the staple cartridge base 11.

[0058] An actuator block 15 is slidably disposed within the staple cartridge 12. When the actuator block 15 is... Figure 3 and Figures 31-32 When the blade 332 of the firing member 33 is pushed, the inclined surface of the actuating block 15 pushes out the anastomotic staple to anastomose the tissue. For the assembly relationship between the actuating block 15, the anastomotic staple, the staple cartridge 12 and the firing member 33, please refer to the prior art, which does not involve the inventive point of this case, and will not be described in detail here.

[0059] The staple cartridge assembly 10 provided by the present invention has a staple cartridge support layer 13 fixed to the working surface of the staple cartridge 12 by a fixing mechanism 14. The working surface of the staple cartridge 12 refers to the surface of the staple cartridge 12 facing the anvil assembly 20.

[0060] The fixing mechanism 14 includes a rivet fixing mechanism, an anchor fixing mechanism, a wire binding fixing mechanism, and a wire tie fixing mechanism. The rivets and anchors can be made of absorbable materials.

[0061] The fixing mechanism 14 is divided into three parts, which include a proximal fixing part, a fixing part connecting part and a distal fixing part connected in sequence.

[0062] If the fixing mechanism 14 is a rivet fixing mechanism, then the near-end fixing part is a near-end rivet, the fixing part connecting part is a linkage (e.g., a connecting rod, a transmission rod), and the far-end fixing part is a far-end rivet.

[0063] If the fixing mechanism 14 is an anchor fixing mechanism, then the near-end fixing part is a near-end anchor, the fixing part connecting part is a linkage (e.g., a connecting rod, a transmission rod), and the far-end fixing part is a far-end anchor.

[0064] If the fixing mechanism 14 is a flexible wire binding fixing mechanism or a wire tying fixing mechanism, then the proximal fixing part is the proximal part of the wire binding or tying, the distal fixing part is the distal part of the wire binding or tying, and the fixing part connecting part is the middle part of the wire binding or tying.

[0065] The proximal fixing portion connects to the proximal end (12a, 11a) of the staple cartridge 12 or the staple cartridge base 11 to fix the proximal end 13a of the staple cartridge support layer 13 to the proximal end 12a of the staple cartridge 12. The distal fixing portion connects to the distal end 12b of the staple cartridge 12 to fix the distal end 13b of the staple cartridge support layer 13 to the distal end 12b of the staple cartridge 12. The fixing portion connection portion is located on the outside of the staple cartridge 12 or the staple cartridge base 11.

[0066] The proximal fixation portion can be released by the firing member 33 to release the proximal end 13a of the staple cartridge support layer 13.

[0067] The distal fixation part is released from fixation through the fixation part connecting part and the proximal fixation part. That is, when the proximal fixation part releases the fixation on the proximal end 13a of the staple cartridge support layer 13, the fixation part connecting part will correspondingly drive the distal fixation part to release the fixation on the distal end 13b, thereby releasing the distal end 13b of the staple cartridge support layer 13. This allows the distal end 13b of the staple cartridge support layer 13 to be released in advance, and the entire staple cartridge support layer 13 to be in a fully released state in advance. Even if the firing component 33 fails to reach the distal end of the staple cartridge 12 or the staple cartridge support layer 13 due to an accident, the staple cartridge support layer 13 will separate from the staple cartridge 12 and remain on the tissue.

[0068] In one embodiment, such as Figure 4-16 As shown, the fixing mechanism 14 includes a staple cartridge binding wire 141.

[0069] The proximal end 13a and distal end 13b of the staple cartridge support layer 13 are fixed to the proximal end 12a and distal end 12b of the staple cartridge 12 by the proximal end 141a and distal end 141b of the staple cartridge binding wire 141, respectively. The middle connecting part 141c of the staple cartridge binding wire 141 is located on the outside of the staple cartridge base 11.

[0070] When the proximal end 141a of the staple cartridge binding line 141 is cut, the staple cartridge binding line 141 is in a loose state, and the distal end 141b of the staple cartridge binding line 141 releases the distal end 13b of the staple cartridge support layer 13, and the distal end 13b of the staple cartridge support layer 13 is in a pre-release state.

[0071] In this embodiment, the fixing mechanism 14 adopts a wire-binding fixing mechanism, which includes a whole staple cartridge binding wire 141.

[0072] The staple cartridge binding wire 141 is an elastic binding wire. For ease of description, the staple cartridge binding wire 141 is divided into a proximal end 141a, an intermediate connecting part 141c, and a distal end 141b. The proximal end 141a of the staple cartridge binding wire 141 is the proximal fixing part of the fixing mechanism 14, the distal end 141b of the staple cartridge binding wire 141 is the distal fixing part of the fixing mechanism 14, and the intermediate connecting part 141c of the staple cartridge binding wire 141 is the fixing part connecting part of the fixing mechanism 14.

[0073] The proximal end 141a and the end 141d of the staple cartridge binding wire 141 have the following two connection methods: Connection method 1: Connect the end 141d of the proximal end 141a of the staple cartridge 141 to the first side along the width direction of the proximal end 12a of the staple cartridge 12. This connection method is suitable for detachable assembly of the staple cartridge 12 and the staple cartridge base 11, so that the staple cartridge 12 can be replaced when replacing parts.

[0074] Connection method two: Connect the end 141d of the proximal end 141a of the staple cartridge binding wire 141 to the first side along the width direction of the proximal end 11a of the staple cartridge base 11. This connection method is suitable for the assembly of the staple cartridge 12 and the staple cartridge base 11 as an integral unit, and the entire staple cartridge assembly 10 is replaced when replacing parts.

[0075] The end 141d of the proximal end 141a can be fixed by knotting, welding or other means, or a corresponding fixing groove, fixing hole or slot can be opened on the proximal end of the staple cartridge 12 or the staple cartridge base 11 to assemble with the end 141d.

[0076] After the end 141d of the proximal end 141a is fixed, the proximal end 141a extends toward the second side along the width direction of the staple cartridge 12, and the proximal end 13a of the staple cartridge support layer 13 is fixed to the proximal end 12a of the staple cartridge 12. Specifically, the proximal end 141a presses against the proximal end 13a of the staple cartridge support layer 13.

[0077] The other end of the proximal end 141a is temporarily restricted on a second side of the proximal end of the staple cartridge 12 or staple cartridge base 11. Specifically, a through hole, through slot, bracket, or other restrictive structure may be provided on the second side of the proximal end of the staple cartridge 12 or staple cartridge base 11 to prevent the other end of the proximal end 141a from detaching from the proximal end of the staple cartridge 12 or staple cartridge base 11, thereby restricting the staple cartridge support layer 13 to the proximal end 12a of the staple cartridge 12. After the proximal end 141a is cut off by the blade 332 of the firing member 33 at approximately the middle portion, the portion of the proximal end 141a near the second side may slide relative to the through hole, through slot, bracket, etc., and detach from the proximal end (12a, 11a) of the staple cartridge 12 or staple cartridge base 11.

[0078] The intermediate connecting portion 141c is located outside the side plate 111 on the second side of the staple cartridge base 11, extending from the proximal end side of the staple cartridge base 11 to the distal end side. After the proximal end portion 141a is cut off, the intermediate connecting portion 141c can slide distally relative to the side plate 111, thereby releasing the distal end portion 141b.

[0079] The end 141e of the distal end 141b is connected to the first side of the distal end 12b of the staple cartridge 12. A portion of the distal end 141b extends along the width direction of the staple cartridge 12 to secure the distal end 13b of the staple cartridge support layer 13 to the distal end 12b of the staple cartridge 12. Specifically, the distal end 141b presses against the distal end 13b of the staple cartridge support layer 13.

[0080] The end 141e of the distal end 141b can be fixed by knotting, welding or other means, or a corresponding fixing groove, fixing hole or slot can be opened on the distal end 12b of the staple cartridge 12 to assemble with the end 141e of the distal end 141b.

[0081] In use, the firing member 33 moves from the proximal end to the distal end of the staple cartridge 12, and the blade 332 of the firing member 33 first reaches the proximal end 13a of the staple cartridge support layer 13 (see reference). Figure 31 ), and cut off the transverse proximal end 141a, and then continue moving toward the distal end 12b of the staple cartridge 12 (see reference). Figure 32 ).

[0082] After the proximal end 141a is cut off, the intermediate connecting part 141c is released. The intermediate connecting part 141c slides distally relative to the side plate 111, thereby causing the distal end 141b to be released prematurely. The distal end 141b will release the distal end 13b of the staple cartridge support layer 13 prematurely, and the entire staple cartridge support layer 13 will be in a fully released state in advance. Even if the blade 332 of the firing member 33 fails to reach the distal end 13b of the staple cartridge support layer 13 due to an accident, and the blade 332 fails to cut the distal end 141b, the prematurely released staple cartridge support layer 13 can still separate from the staple cartridge 12, without affecting the instrument retrieval action. When the staple cartridge 12 is retrieved, the staple cartridge support layer 13 will remain on the tissue.

[0083] In one embodiment, when the proximal end 141a of the staple cartridge binding wire 141 is cut, the end 141d of the proximal end 141a of the staple cartridge binding wire 141 remains connected to the proximal end (11a, 12a) of the staple cartridge base 11 or the staple cartridge 12, and the end 141e of the distal end 141b of the staple cartridge binding wire 141 remains connected to the distal end 12b of the staple cartridge 12.

[0084] In this embodiment, the end 141d of the proximal end 141a is continuously connected to the proximal end (11a, 12a) of the staple cartridge base 11 or the staple cartridge 12 without separation, and the end 141e of the distal end 141b is continuously connected to the distal end 12b of the staple cartridge 12 without separation. When the end effector is removed, the staple cartridge binding wire 141 will be removed from the human body along with the staple cartridge 12 and will not remain in the body.

[0085] In one embodiment, such as Figure 8 , Figure 11-12 , Figure 15 and Figure 18-19 As shown, along the width direction of the staple cartridge base 11, the near ends (11a, 12a) of the staple cartridge base 11 or the staple cartridge 12 are respectively provided with near end fixing holes / grooves (114, 124) and near end through holes / grooves (115, 125).

[0086] The end 141d of the proximal end 141a of the staple cartridge binding wire 141 is connected to the proximal fixing hole / slot (114, 124).

[0087] The other end of the proximal end 141a of the staple cartridge binding wire 141 passes through the proximal through hole / slot (115, 125).

[0088] In this embodiment, a proximal fixing hole / groove 124 is provided on the first side of the proximal end 12a of the staple cartridge 12, or a proximal fixing hole / groove 114 is provided on the first side of the proximal end 11a of the staple cartridge base 11.

[0089] The proximal fixation holes / grooves (114, 124) are either proximal fixation holes or proximal fixation grooves. The proximal fixation holes are small holes, with a diameter smaller than the diameter of the staple cartridge binding wire 141. The proximal fixation grooves are narrow grooves, with a width smaller than the diameter of the staple cartridge binding wire 141. The end 141d of the proximal end piece 141a passes through the proximal fixation hole / grooves (114, 124), and the proximal end piece 141a is press-fitted with the proximal fixation hole / grooves (114, 124), securing the end 141d to the proximal fixation hole / grooves (114, 124) through friction. Then, the portion of the end 141d that protrudes from the proximal fixation hole / grooves (114, 124) is knotted using heat fusion or mechanical methods, providing double protection.

[0090] In this embodiment, a proximal through-hole / groove 125 is provided on the second side of the proximal end 12a of the staple cartridge 12, or a proximal through-hole / groove 115 is provided on the second side of the proximal end 11a of the staple cartridge base 11. The proximal through-hole / groove (115, 125) is either a proximal through-hole or a proximal through-groove. The proximal through-hole is a large hole, with a diameter larger than the diameter of the staple cartridge binding wire 141, and its wall is smooth. The proximal through-groove is a wide groove, with a width greater than the diameter of the staple cartridge binding wire 141, and its wall is smooth. The proximal through-hole / groove serves to support the other end of the proximal end 141a. The other end of the proximal end 141a passes through the proximal through-hole / groove (115, 125), and the proximal end 141a presses against the proximal end 13a of the staple cartridge support layer 13. The proximal end 141a is clearance-fitted with the proximal through-hole / slot (115, 125). After the proximal end 141a is sheared off, a portion of the proximal end 141a is held connected to the proximal end 12a of the staple cartridge 12 or the proximal end 11a of the staple cartridge base 11 by the end 141e. The other portion of the proximal end 141a slides through the proximal through-hole / slot (115, 125) and eventually disengages from the proximal through-hole / slot (115, 125). The intermediate connecting portion 141c is released and slides distally relative to the side plate 111, thereby causing the distal end 141b to be released prematurely, thus releasing the distal end 13b of the staple cartridge support layer 13 in advance.

[0091] In one embodiment, such as Figure 4-6 , Figure 8 and Figure 11-12 As shown, the staple cartridge 12 and the staple cartridge base 11 are detachably connected.

[0092] The staple cartridge 12 has outwardly protruding staple cartridge protrusions 121 on opposite sides of the proximal end 12a. The proximal fixing hole / groove 124 and the proximal through hole / groove 125 are respectively provided on the staple cartridge protrusions 121.

[0093] In this embodiment, the staple cartridge 12 and the staple cartridge base 11 can be assembled together, and only the staple cartridge 12 needs to be replaced when replacing parts.

[0094] A staple cartridge protrusion 121 is provided on a first side and a second side of the proximal end 12a of the staple cartridge 12. The staple cartridge protrusion 121 may be a support plate, a support piece, a support block, etc. A proximal fixing hole / slot and a proximal through hole / slot are respectively provided on the staple cartridge protrusion 121. The proximal fixing hole / slot is provided on the staple cartridge protrusion 121 on the first side, and the proximal through hole / slot is provided on the staple cartridge protrusion on the second side.

[0095] The top surface of the staple cartridge protrusion 121 is preferably lower than the working surface of the staple cartridge 12 to ensure that the proximal end 141a of the staple cartridge binding wire 141 can press against the proximal end 13a of the staple cartridge support layer 13.

[0096] In one embodiment, such as Figure 8 As shown, the side plate 111 of the staple cartridge base 11 has a clearance notch 112, and the staple cartridge protrusion 121 is at least partially located in the clearance notch 112.

[0097] In this embodiment, by opening an avoidance notch 112 on the side plate 111 of the staple cartridge base 11, installation space is provided for the staple cartridge protrusion 121, which facilitates assembly and also reduces the distance between the two side plates 111.

[0098] In one embodiment, such as Figure 14-15 and Figure 17-19 As shown, the staple cartridge 12 and the staple cartridge base 11 are integrated.

[0099] The proximal fixing hole / slot 114 and the proximal through hole / slot 115 are respectively provided on the side plates 111 on both sides of the staple cartridge base 11.

[0100] In this embodiment, the staple cartridge 12 and the staple cartridge base 11 are assembled as a single unit, and the staple cartridge assembly 10 is replaced directly when replacing parts.

[0101] The proximal fixing hole / slot 114 and the proximal through hole / slot 115 are respectively provided on the side plates 111 on both sides of the staple cartridge base 11. The bottom surface of the proximal fixing hole / slot 114 and the proximal through hole / slot 115 is preferably lower than the working surface of the staple cartridge 12 to ensure that the proximal end 141a passing through the staple cartridge base 11 can press against the proximal end 13a of the staple cartridge support layer 13.

[0102] like Figure 15 As shown, the window 113 set on the side plate 111 can also be a type of near-end via.

[0103] The staple cartridge base 11 is made of metal and is supported by connectors, so it is not easy to deform under force. By passing the proximal end 141a of the staple cartridge binding wire 141 through the staple cartridge base 11 and then pressing down the proximal end 13a of the staple cartridge support layer 13, deformation of the proximal end 12a of the staple cartridge 12 can be avoided.

[0104] In one embodiment, a side plate groove extending from the proximal side to the distal side is provided on the outer surface of the side plate 111 of the staple cartridge base 11, and the middle connecting part 141c of the staple cartridge binding wire 141 is fitted into the side plate groove.

[0105] In this embodiment, a side plate groove extending from the proximal side to the distal side is formed on the outer surface of the side plate 111 on the second side of the staple cartridge base 11. The width of the side plate groove is greater than the diameter of the staple cartridge binding wire 141, and the middle connecting part 141c of the staple cartridge binding wire 141 is fitted into the gap of the side plate groove.

[0106] Under normal conditions, the side plate groove serves to house the intermediate connecting part 141c. After the proximal end 141a of the staple cartridge binding wire 141 is cut off, the side plate groove serves to guide the intermediate connecting part 141c to slide distally.

[0107] In one embodiment, such as Figure 9-10 and Figure 13 As shown, a distal fixing hole / groove 126 is provided on one side of the distal end 12b of the staple cartridge 12, and a distal end slide groove 122 extending along the width direction is provided on the working surface of the distal end of the staple cartridge 12.

[0108] The distal end 141b of the staple cartridge binding wire 141 is clearance-fitted with the distal end slide groove 122 of the staple cartridge, and the end 141e of the distal end 141b of the staple cartridge binding wire 141 is connected to the distal end fixing hole / slot 126.

[0109] In this embodiment, a distal end groove 122 is provided on the working surface of the distal end 12b of the staple cartridge 12, extending along the width direction of the staple cartridge 12. The width of the distal end groove 122 is greater than the diameter of the staple cartridge binding wire 141, and the distal end 141b of the staple cartridge binding wire 141 is fitted into the distal end groove 122. The distal end groove 122 guides the sliding of the distal end 141b. The distal end 141b presses a portion of the distal end 13b of the staple cartridge support layer 13 into the distal end groove 122, which helps to fix the distal end 13b of the staple cartridge support layer 13.

[0110] In this embodiment, a distal fixing hole / slot 126 is provided on the first side of the distal end 12b of the staple cartridge 12. The distal fixing hole / slot 126 can be either a distal fixing hole or a proximal fixing slot. The distal fixing hole is a small hole, and its diameter is smaller than the diameter of the staple cartridge binding wire 141. The distal fixing slot is a narrow slot, and its width is smaller than the diameter of the staple cartridge binding wire 141. After the distal end 141b of the staple cartridge binding wire 141 passes through the distal sliding groove 122 of the staple cartridge, the end 141e of the distal end 141b passes through the distal fixing hole / slot 126. The distal end 141b and the distal fixing hole / slot 126 are press-fitted, and the end 141e is fixed to the distal fixing hole / slot 126 by friction. Then, the part of the end 141e that protrudes from the distal fixing hole / slot 126 is knotted by heat fusion or mechanical means, which provides double protection.

[0111] In one embodiment, such as Figure 9-10 and Figure 13 As shown, the working surface at the distal end of the staple cartridge 12 has a distal end inclined surface 123, and a distal end slide groove 122 is provided on the distal end inclined surface 123.

[0112] In this embodiment, the distal end slope 123 of the staple cartridge is inclinedly arranged on the distal end 12b of the staple cartridge 12, and gradually moves away from the working surface of the staple cartridge 12 in a direction from the proximal side to the distal side. A distal end groove 122 is provided on the distal end slope 123, and the groove depth of the distal end groove 122 extends from the distal side to the proximal side, and is substantially parallel to the working surface of the staple cartridge 12. A portion of the distal end 13b of the staple cartridge support layer 13 covers the distal end slope 123. When the distal end 141b of the staple cartridge binding wire 141 is placed into the distal end groove 122, a portion of the distal end 13b of the staple cartridge support layer 13 is pressed into the distal end groove 122 to fix the distal end 13b of the staple cartridge support layer 13.

[0113] like Figure 20-23 As shown, an embodiment of the present invention provides an anvil assembly 20, which includes an anvil 21 and an anvil support layer 22 on the working surface of the anvil 21.

[0114] The anvil support layer 22 is restricted to the working surface of the anvil 21 by the limiting mechanism 23.

[0115] The limiting mechanism 23 includes a proximal limiting part, a distal limiting part, and a limiting part connecting part between the proximal limiting part and the distal limiting part.

[0116] The remote restriction unit releases the restriction by linking with the proximal restriction unit through the restriction unit connection unit.

[0117] The proximal end 22a of the anvil support layer 22 is restricted to the proximal end 21a of the anvil 21 by the proximal end restriction portion, and the distal end 22b of the anvil support layer 22 is restricted to the distal end 21b of the anvil 21 by the distal end restriction portion.

[0118] When the proximal restricting part is released from the proximal end 22a of the anvil support layer 22, the distal restricting part is correspondingly released from the distal end 22b of the anvil support layer 22, and the distal end 22b of the anvil support layer 22 is in a pre-released state.

[0119] The anvil assembly 20 provided by this invention is a component of an end effector or surgical instrument, which is used in conjunction with a staple cartridge assembly. The anvil assembly 20 includes an anvil 21, an anvil support layer 22, and a restraining mechanism 23.

[0120] The anvil support layer 22 covers the working surface of the anvil 21. The working surface of the anvil 21 refers to the surface of the anvil 21 facing the staple cartridge assembly.

[0121] The anvil support layer 22 is restricted to the working surface of the anvil 21 by the limiting mechanism 23.

[0122] The limiting mechanism 23 includes rivet limiting mechanisms, anchor limiting mechanisms, binding wire limiting mechanisms, and tie wire limiting mechanisms. Rivets and anchors may be made of absorbable materials.

[0123] The limiting mechanism 23 is divided into three parts, which include a proximal limiting part, a limiting part connecting part and a distal limiting part connected in sequence.

[0124] If the limiting mechanism 23 is a rivet limiting mechanism, then the proximal limiting part is a proximal rivet, the limiting part connecting part is a linkage (e.g., a connecting rod, a transmission rod), and the distal limiting part is a distal rivet.

[0125] If the limiting mechanism 23 is an anchor limiting mechanism, then the near-end limiting part is a near-end anchor, the limiting part connecting part is a linkage (e.g., a connecting rod, a transmission rod), and the far-end limiting part is a far-end anchor.

[0126] If the limiting mechanism 23 is a flexible binding wire limiting mechanism or a tie wire limiting mechanism, then the proximal limiting part is the proximal part of the binding wire or tie wire, the distal limiting part is the distal part of the binding wire or tie wire, and the limiting part connecting part is the middle part of the binding wire or tie wire.

[0127] The proximal limiting portion is connected to the proximal end portion 21a of the anvil 21 to limit the proximal end portion 22a of the anvil support layer 22 to the proximal end portion 21a of the anvil 21. The distal limiting portion is connected to the distal end portion 21b of the anvil 21 to limit the distal end portion 22b of the anvil support layer 22 to the distal end portion 21b of the anvil 21. The limiting portion connection portion is located on the side or back side of the anvil 21.

[0128] The proximal restraint can be released by the firing member 33 to release the proximal end 22a of the anvil support layer 22.

[0129] The distal limiting part releases its restriction in conjunction with the proximal limiting part through the limiting part connecting part. That is, when the proximal limiting part releases its restriction on the proximal end 22a of the anvil support layer 22, the limiting part connecting part will correspondingly drive the distal limiting part to release its restriction on the distal end 22b, thereby releasing the distal end 22b of the anvil support layer 22. This causes the distal end 22b of the anvil support layer 22 to be released in advance, and the entire anvil support layer 22 is in a fully released state in advance. Even if the firing member 33 fails to reach the anvil 21 or the distal end of the anvil support layer 22 due to an accident, the anvil support layer 22 will separate from the anvil 21 and remain on the tissue.

[0130] In one embodiment, such as Figure 20-23 As shown, the limiting mechanism 23 includes an anvil binding wire 231.

[0131] The proximal end 22a and distal end 22b of the anvil support layer 22 are respectively restricted to the proximal end 21a and distal end 21b of the anvil 21 by the proximal end 231a and distal end 231b of the anvil binding wire 231, and the intermediate connecting part 231c of the anvil binding wire 231 is located on the side or back of the anvil 21.

[0132] When the proximal end 231a of the anvil binding wire 231 is cut, the anvil binding wire 231 is in a loose state, and the distal end 231b of the anvil binding wire 231 releases the distal end 22a of the anvil support layer 22, and the anvil support layer 22 is in a pre-release state.

[0133] In this embodiment, the limiting mechanism 23 is a wire binding limiting mechanism, which includes a whole anvil binding wire 231.

[0134] The anvil binding wire 231 is an elastic binding wire. For ease of description, the anvil binding wire 231 is divided into a proximal end 231a, an intermediate connecting portion 231c, and a distal end 231b. The proximal end 231a of the anvil binding wire 231 is the proximal limiting portion of the limiting mechanism 23, the distal end 231b of the anvil binding wire 231 is the distal limiting portion of the limiting mechanism 23, and the intermediate connecting portion 231c of the anvil binding wire 231 is the limiting portion connecting portion of the limiting mechanism 23.

[0135] The end 231d of the proximal end 231a of the anvil binding wire 231 is connected to the bottom of the proximal end 21a of the anvil 21. A proximal end limiting hole / slot 211 is provided on one side of the bottom of the proximal end 21a along the width direction, and a proximal end through hole / slot 212 is provided on the other side. The end 231d of the proximal end 231a is interference-fitted in the proximal end limiting hole / slot 211. Knotting or welding can also be done on the end 231d of the proximal end 231a to improve the stability of the connection.

[0136] After the end 231d of the proximal end 231a is fixed, the proximal end 231a extends to the other side along the width direction of the anvil 21 and restricts the proximal end 22a of the anvil support layer 22 onto the proximal end 21a of the anvil 21. Specifically, the proximal end 231a presses against the proximal end 22a of the anvil support layer 22.

[0137] The other end of the proximal end 231a passes through the proximal end through hole / groove 212, and the anvil binding wire 231 is clearance-fitted with the proximal end through hole / groove 212.

[0138] The intermediate connecting portion 231c is located on the back or side of the anvil 21, extending from the proximal side to the distal side of the anvil 21. After the proximal end 231a is cut off, the intermediate connecting portion 231c can slide distally relative to the anvil 21, thereby releasing the distal end 231b.

[0139] A distal end groove 213 is provided at the end of the distal end 21b of the anvil 21, and a distal fixing hole / groove (not shown in the figure) is provided on one side or at the bottom of the distal end 21b. After passing through the distal end groove 213, the distal end 231e connects to the distal fixing hole / groove. The distal end 231b restricts the distal end 22b of the anvil support layer 22 onto the distal end 21b of the anvil 21; specifically, the distal end 231b presses against the distal end 22b of the anvil support layer 22.

[0140] In use, the firing member 33 moves from the proximal side to the distal side of the anvil 21, and the blade 332 of the firing member 33 first reaches the proximal end 22a of the anvil support layer 22 (see reference). Figure 31 ), and cut off the transverse proximal end 231a, and then continue moving toward the distal end 12b of the anvil 21 (see reference). Figure 32 ).

[0141] After the proximal end 231a is cut off, the intermediate connecting portion 231c is released. The intermediate connecting portion 231c slides distally relative to the anvil 21, causing the distal end 231b to release prematurely. The distal end 231b releases the distal end 22b of the anvil support layer 22 prematurely, and the entire anvil support layer 22 is in a fully released state in advance. Even if the blade 332 of the firing member 33 fails to reach the distal end 22b of the anvil support layer 22 due to an accident, and the blade 332 fails to cut the distal end 231b, the prematurely released anvil support layer 22 can still separate from the anvil 21, without affecting the instrument removal action. When the anvil 21 is removed, the anvil support layer 22 will remain on the tissue.

[0142] In one embodiment, when the proximal end 231a of the anvil binding wire 231 is cut, the end 231d of the proximal end 231a of the anvil binding wire 231 remains connected to the proximal end 21a of the anvil 21, and the end 231e of the distal end 231b of the anvil binding wire 231 remains connected to the distal end 21b of the anvil 21.

[0143] In this embodiment, the end 231d of the proximal end 231a remains connected to the proximal end 21a of the anvil 21 and does not separate, and the end 231e of the distal end 231b remains connected to the distal end 21b of the anvil 21 and does not separate. When the end effector is removed, the anvil binding wire 231 is removed from the human body along with the anvil 21 and will not remain in the body.

[0144] In one embodiment, such as Figure 20-21 The working surface at the distal end of the anvil 21 has a distal anvil inclined surface 214, and a distal anvil groove 213 is provided on the distal anvil inclined surface 214.

[0145] In this embodiment, the distal bevel 214 of the anvil is arranged obliquely on the distal end 21b of the anvil 21, and gradually moves away from the working surface of the anvil 21 in a direction from proximal to distal. A distal groove 213 is provided on the distal bevel 214, and the groove depth of the distal groove 213 extends from the distal to the proximal side or toward the bottom of the anvil 21. A portion of the distal end 22b of the anvil support layer 22 covers the distal bevel 214. When the distal end 231b of the anvil binding wire 231 is placed into the distal groove 213, a portion of the distal end 22b of the anvil support layer 22 is pressed into the distal groove 213 to secure the distal end 22b of the anvil support layer 22.

[0146] like Figure 24-25 As shown, another embodiment of the present invention provides an anvil assembly 20, including an anvil 21, an anvil support layer 22 on the working surface of the anvil 21, a proximal fastening mechanism 24 for restricting the proximal end 22a of the anvil support layer 22, and a distal fastening mechanism 25 for restricting the distal end 22b of the anvil support layer 22.

[0147] The distal fastening mechanism 25 includes a proximal fastening part, a distal fastening part, and a fastening part connecting part connected between the proximal fastening part and the distal fastening part. The distal fastening part releases its fastening by interlocking with the proximal fastening part through the fastening part connecting part.

[0148] The distal end 22b of the anvil support layer 22 is fastened to the distal end 21b of the anvil 21 by the distal fastener.

[0149] The proximal fastener is fastened to the dorsal side of the distal end 21b of the anvil 21.

[0150] When the proximal fastening part is released from the distal end 21b of the anvil 21, the distal fastening part is correspondingly released from the distal end 22b of the anvil support layer 22, and the distal end 22b of the anvil support layer 22 is in a pre-released state.

[0151] The anvil assembly 20 provided by the present invention is a component of an end effector or surgical instrument, which is used in conjunction with a staple cartridge assembly. The anvil assembly 20 includes an anvil 21, an anvil support layer 22, a proximal fastening mechanism 24, and a distal fastening mechanism 25.

[0152] This embodiment uses a proximal fastening mechanism 24 and a distal fastening mechanism 25 to fasten the anvil support layer 22, which can be applied to thinner, narrower or smaller anvils 21.

[0153] The proximal fastening mechanism 24 and the distal fastening mechanism 25 can be riveting fastening mechanisms, anchor fastening mechanisms, wire binding fastening mechanisms, or wire tying fastening mechanisms. The rivets and anchors can be made of absorbable materials.

[0154] The proximal fastening mechanism 24 is fastened to the proximal end 21a of the anvil 21 to fasten the proximal end 22a of the anvil support layer 22 to the proximal end 21a. The distal fastening mechanism 25 is fastened to the distal end 21b of the anvil 21 to fasten the distal end 22b of the anvil support layer 22 to the distal end 21b.

[0155] The distal fastening mechanism 25 is divided into three parts, including a proximal fastening part, a fastening part connecting part and a distal fastening part connected sequentially from the proximal side to the distal side.

[0156] If the remote fastening mechanism 25 is a rivet fastening mechanism, then the proximal fastening part is a proximal rivet, the fastening part connection part is a linkage (such as a connecting rod or transmission rod), and the remote fastening part is a remote rivet.

[0157] If the remote fastening mechanism 25 is an anchor fastening mechanism, then the proximal fastening part is a proximal anchor, the fastening part connection part is a linkage (e.g., a connecting rod, a transmission rod), and the remote fastening part is a remote anchor.

[0158] If the distal fastening mechanism 25 is a flexible wire binding fastening mechanism or a wire tying fastening mechanism, then the proximal fastening part is the proximal part of the wire binding or tying, the distal fastening part is the distal part of the wire binding or tying, and the fastening part connection part is the middle part of the wire binding or tying.

[0159] The distal fastener is located on the working surface of the distal end 21b of the anvil 21 to fasten the distal end 22b of the anvil support layer 22. The proximal fastener is located on the back side of the distal end 21b and is proximal to the distal fastener; that is, the proximal fastener is located on the side of the distal fastener facing the proximal fastening mechanism 24. A fastener connector connects the proximal fastener and the distal fastener, and the fastener connector may be located on the back side or side of the distal end 21b.

[0160] The proximal fastener can be released by the firing member 33 to disengage from the distal end 21b of the anvil 21. Of course, the firing member 33 releases the proximal fastener from the distal end 21b of the anvil 21 after releasing the proximal fastening mechanism 24 from the proximal end 21a of the anvil 21. When the proximal fastener is released from the distal end 21b, the proximal end 22a of the anvil support layer 22 is already released.

[0161] The distal fastener releases its fastening in conjunction with the proximal fastener via the fastener connector. That is, when the proximal fastener releases its fastening from the distal end 21b of the anvil 21, the fastener connector will correspondingly release the distal fastener from its fastening of the distal end 22b, thereby releasing the distal end 22b of the anvil support layer 22. This allows the distal end 22b of the anvil support layer 22 to be released prematurely, and the entire anvil support layer 22 is in a fully released state. Even if the firing member 33 fails to release the distal fastener from the anvil 21 or the distal end of the anvil support layer 22 due to an accident, as long as the firing member 33 releases the proximal fastener, the anvil support layer 22 will separate from the anvil 21 and remain on the tissue.

[0162] In one embodiment, such as Figure 25-30 As shown, the remote fastening mechanism 25 includes a remote binding wire 251.

[0163] The distal binding wire 251 includes a proximal segment 251a, an intermediate connecting segment 251c, and a distal segment 251b connected in sequence.

[0164] The ends (251d, 251e) of the proximal segment 251a and the distal segment 251b are connected to one side of the distal end 21b of the anvil 21, and the intermediate connecting segment 251c is located on the other side of the distal end 21b of the anvil 21.

[0165] The distal segment 251b secures the distal end 22b of the anvil support layer 22 to the distal end 21b of the anvil 21, while the proximal segment 251a is located on the back side of the distal end 21b of the anvil 21.

[0166] When the proximal segment 251a is cut, the distal binding wire 251 is in a loosened state, and the distal end 22b of the anvil support layer 22 is in a pre-released state.

[0167] In this embodiment, the distal fastening mechanism 25 is a wire-binding fastening mechanism, which includes a single distal binding wire 251. The proximal fastening mechanism 24 may be a proximal binding wire 241, an anchor, or a rivet.

[0168] The distal binding 251 is an elastic binding suture. For ease of description, the distal binding 251 is divided into a proximal segment 251a, an intermediate connecting segment 251c, and a distal segment 251b along the direction from the proximal to the distal side. After binding, the distal binding 251 takes on a U-shape or a C-shape.

[0169] The proximal segment 251a of the distal binding wire 251 is the proximal fastening part of the distal fastening mechanism 25, the distal segment 251b of the distal binding wire 251 is the distal fastening part of the distal fastening mechanism 25, and the intermediate connecting segment 251c of the distal binding wire 251 is the fastening part connecting part of the distal fastening mechanism 25.

[0170] The proximal segment 251a is located on the dorsal side of the distal end 21b and proximal to the distal segment 251b, while the intermediate connecting segment 251c is located on the outer side or dorsal side of the distal end 21b of the anvil 21. If the end 251d of the proximal segment 251a and the end 251e of the distal segment 251b are connected to the first side of the distal end 21b of the anvil 21, then the intermediate connecting segment 251c is located on the second side of the distal end 21b of the anvil 21. If necessary, distal fixing holes / grooves can be formed on the side or back of the distal end 21b of the anvil 21 to fix the ends 251d and 251e.

[0171] The distal segment 251b is located on the working surface of the distal end 21b of the anvil 21 and presses the distal end 22b of the anvil support layer 22 onto the distal end 21b of the anvil 21. The proximal segment 251a is located on the back side of the anvil 21 and is separated from the anvil support layer 22, and does not serve to fasten the anvil support layer 22.

[0172] The distance by which the proximal segment 251a precedes the distal segment 251b can be set according to actual needs. Since the proximal segment 251a is located near the distal segment 251b, it is cut off by the blade 332 of the firing member 33 before the distal segment 251b. After the proximal segment 251a is cut off, the intermediate connecting segment 251c is released, and it contracts or slides toward the distal segment 251b, thereby causing the distal segment 251b to release earlier. The distal segment 251b will release the distal end 22b of the anvil support layer 22 earlier, and the entire anvil support layer 22 will be in a fully released state earlier. Even if the blade 332 of the firing member 33 fails to reach the distal end 22b of the anvil support layer 22 due to an accident, and the blade 332 cannot cut the distal segment 251b, the anvil support layer 22 can be in a pre-released state as long as the blade 332 can reach the proximal end 22b and cut the proximal segment 251a. The pre-released anvil support layer 22 can also separate from the anvil 21 without affecting the instrument removal action. When the anvil 21 is removed, the anvil support layer 22 will remain on the tissue.

[0173] In one embodiment, when the proximal segment 251a is cut off, the ends (251d, 251e) of both the proximal segment 251a and the distal segment 251b remain connected to the distal end 21b of the anvil 21.

[0174] In this embodiment, the ends 251d of the proximal segment 251a and 251e of the distal segment 251b of the distal ligature 251 are continuously connected to the distal end 21b of the anvil 21 without separation. When the end effector is removed, the distal ligature 251 is removed from the body along with the anvil 21 and will not remain in the body.

[0175] Of course, the two ends of the proximal ligature 241 also remain connected to the proximal end 21a of the anvil 21. When the end effector is removed, the proximal ligature 241 is also removed from the body along with the anvil 21 and will not remain in the body.

[0176] In one embodiment, such as Figure 26-30 As shown, a distal groove 217 is provided on the working surface of the distal end 21b of the anvil 21, a proximal groove 215 is provided on the back side of the distal end of the anvil 21, and a transition groove 216 connecting the distal groove 217 and the proximal groove 215 is provided on the side or back side of the anvil 21. The proximal groove 215, the transition groove 216 and the distal groove 217 are connected in sequence in a U-shape or C-shape.

[0177] The proximal section 251a is clearance-fitted with the proximal slide groove 215, the intermediate connecting section 251c is clearance-fitted with the transition slide groove 216, and the distal section 251b is clearance-fitted with the distal slide groove 217.

[0178] In this embodiment, a U-shaped or C-shaped groove is formed on the distal end 21b of the anvil 21, including a proximal groove 215, a transition groove 216, and a distal groove 217 connected sequentially along a direction from the proximal to the distal side. The proximal groove 215 is located on the back side of the anvil 21, the transition groove 216 is located on the side or back side of the anvil 21, and the distal groove 217 is located on the working surface of the distal end 21b of the anvil 21.

[0179] The widths of the proximal groove 215, the transition groove 216, and the distal groove 217 are all greater than the diameter of the distal binding wire 251, and the groove walls are smooth.

[0180] The proximal segment 251a of the distal binding wire 251 is guided by the proximal groove 215, and one end 251d of the proximal segment 251a is fixed in or around the proximal groove 215. The intermediate connecting segment 251c of the distal binding wire 251 is guided by the transition groove 216, and the distal segment 251b of the distal binding wire 251 is guided by the distal groove 217.

[0181] After the proximal segment 251a of the distal binding wire 251 is cut by the blade 332, the distal binding wire 251 will slide along the proximal groove 215, the transition groove 216 and the distal groove 217, so that the distal segment 251b can release the distal end 22b of the anvil support layer 22.

[0182] Under normal conditions, the proximal groove 215, the transition groove 216, and the distal groove 217 serve to collect the distal binding wire 251.

[0183] After the proximal segment 251a is cut, the proximal groove 215, the transition groove 216 and the distal groove 217 serve as guides to guide the contraction of the distal binding line 251.

[0184] In one embodiment, the working surface of the distal end of the anvil 21 has a distal anvil ramp 214, and a distal groove 217 is provided on the distal anvil ramp 214.

[0185] In this embodiment, the distal bevel 214 of the anvil is arranged obliquely on the distal end 21b of the anvil 21, and gradually moves away from the working surface of the anvil 21 in a direction from proximal to distal. A distal groove 217 is provided on the distal bevel 214 of the anvil, and the groove depth of the distal groove 217 extends from the distal to the proximal side or toward the bottom of the anvil 21. A portion of the distal end 22b of the anvil support layer 22 covers the distal bevel 214 of the anvil. When the distal segment 251b of the distal binding wire 251 is placed into the distal groove 217, a portion of the distal end 22b of the anvil support layer 22 is pressed into the distal groove 217 to fix the distal end 22b of the anvil support layer 22.

[0186] like Figure 3 and Figures 31-32 As shown, an embodiment of the present invention provides an end effector including a loading unit 30, a staple cartridge assembly 10, and a staple anvil assembly 20.

[0187] The loading unit 30 has a firing component 33.

[0188] The staple cartridge assembly 10 and the anvil assembly 20 are respectively connected to the far end of the loading unit 30, and the staple cartridge assembly 10 and the anvil assembly 20 are capable of relative movement.

[0189] Wherein, the staple cartridge assembly 10 adopts the staple cartridge assembly 10 described in any of the foregoing embodiments, and / or, the anvil assembly 20 adopts the anvil assembly 20 described in any of the foregoing embodiments.

[0190] The end effector provided by this invention is a component of a surgical instrument, comprising a loading unit 30, a staple cartridge assembly, and an anvil assembly. The loading unit 30, the staple cartridge assembly, and the anvil assembly are replaceable as a whole.

[0191] The loading unit 30 is detachably attached to the distal end of the elongated body 50 of the surgical instrument. The staple cartridge assembly and the anvil assembly are attached to the distal end of the loading unit 30 to form a clamp structure.

[0192] The loading unit 30 includes an outer tube 31, an inner tube 32 disposed within the outer tube 31, and a firing member 33 disposed within the inner tube 32. The inner tube 32 is composed of an upper shell 321 and a bottom shell 322. The firing member 33 is an axially movable firing mechanism, which includes a drive beam 331 and a blade 332 connected to the distal end of the drive beam 331. The blade 332 has a flat portion for pushing the actuator block 15 and a cutting edge portion for cutting binding wire / firing portion for releasing rivets and anchors.

[0193] For details regarding the specific structure of the loading unit 30 and the connection method between the staple cartridge assembly, the staple anvil assembly and the loading unit 30, please refer to the preceding description in this case, which will not be repeated here.

[0194] The end effector provided in this embodiment may use only the staple cartridge assembly 10 with the function of early release support layer, or only the staple anvil assembly 20 with the function of early release support layer, or both the staple cartridge assembly 10 and the staple anvil assembly 20 with the function of early release support layer.

[0195] like Figure 1 As shown, an embodiment of the present invention provides a surgical instrument comprising a handle assembly 40, an elongated body 50, and an end effector as described in the foregoing embodiment, which are sequentially operable from proximal to distal.

[0196] The surgical instrument provided in this embodiment has an end effector loading unit 30 that is detachably connected proximally to the distal end of an elongated body 50, and the end effector can be removed from the elongated body 50 and replaced as a whole.

[0197] like Figure 2 As shown, another embodiment of the present invention provides a surgical instrument including the staple cartridge assembly 10 described in any of the foregoing embodiments, and / or including the anvil assembly 20 described in any of the foregoing embodiments.

[0198] The surgical instrument provided in this embodiment may use only the cartridge assembly 10 with the function of early release of the support layer, or only the anvil assembly 20 with the function of early release of the support layer, or both the cartridge assembly 10 and the anvil assembly 20 with the function of early release of the support layer.

[0199] The surgical instrument provided in this embodiment has a staple cartridge assembly 10 and anvil assembly 20 operably connected to the distal end of an elongated body 50. The staple cartridge 12 in the staple cartridge assembly 10 is detachably connected to the staple cartridge base 11, and the staple cartridge 12 can be replaced separately.

[0200] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0201] The above description is merely the principle and preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several other modifications can be made based on the principle of the present invention, and these modifications should also be considered within the scope of protection of the present invention.

Claims

1. A staple cartridge assembly, comprising a staple cartridge base, a staple cartridge mounted in the staple cartridge base, and a staple cartridge support layer on the working surface of the staple cartridge; Its features are, The staple cartridge support layer is fixed to the working surface of the staple cartridge by a fixing mechanism; The fixing mechanism includes a proximal fixing part, a distal fixing part, and a fixing part connecting part connected between the proximal fixing part and the distal fixing part; The distal fixing part is released from fixing through the fixing part connecting part and the proximal fixing part in conjunction. The proximal end of the staple cartridge support layer is fixed to the proximal end of the staple cartridge by the proximal end fixing part, and the distal end of the staple cartridge support layer is fixed to the distal end of the staple cartridge by the distal end fixing part; When the proximal fixing part is released from the proximal end of the staple cartridge support layer, the distal fixing part is correspondingly released from the distal end of the staple cartridge support layer, and the distal end of the staple cartridge support layer is in a pre-released state.

2. The staple cartridge assembly according to claim 1, characterized in that, The fixing mechanism includes a staple cartridge binding wire; The proximal and distal ends of the staple cartridge support layer are fixed to the proximal and distal ends of the staple cartridge by the proximal and distal ends of the staple cartridge binding wire, respectively, and the middle connecting part of the staple cartridge binding wire is located on the outside of the staple cartridge base; Specifically, when the proximal end of the staple cartridge binding wire is cut, the staple cartridge binding wire is in a loose state, and the distal end of the staple cartridge binding wire releases the distal end of the staple cartridge support layer, thus the distal end of the staple cartridge support layer is in a pre-release state.

3. The staple cartridge assembly according to claim 2, characterized in that, When the proximal end of the staple cartridge binding wire is cut, the end of the proximal end of the staple cartridge binding wire remains connected to the staple cartridge base or the proximal end of the staple cartridge, and the end of the distal end of the staple cartridge binding wire remains connected to the distal end of the staple cartridge.

4. The staple cartridge assembly according to claim 2, characterized in that, Along the width direction of the staple cartridge base, proximal fixing holes / grooves and proximal through holes / grooves are respectively provided on opposite sides of the proximal end of the staple cartridge base or the staple cartridge. The proximal end of the staple cartridge binding wire is connected to the proximal fixing hole / slot; The gap at the other end of the proximal end of the staple cartridge binding wire passes through the proximal end through-hole / groove.

5. The staple cartridge assembly according to claim 4, characterized in that, The staple cartridge and the staple cartridge base are detachably connected; The staple cartridge has outwardly protruding staple cartridge protrusions on opposite sides of its proximal end, and the proximal end fixing hole / groove and the proximal end through hole / groove are respectively provided on the staple cartridge protrusions.

6. The staple cartridge assembly according to claim 5, characterized in that, The side plate of the staple cartridge base has an avoidance notch, and the staple cartridge protrusion is at least partially located in the avoidance notch.

7. The staple cartridge assembly according to claim 4, characterized in that, The staple cartridge and the staple cartridge base are integrally formed; The proximal fixing hole / slot and the proximal through hole / slot are respectively provided on the side plates on both sides of the staple cartridge base.

8. The staple cartridge assembly according to claim 2, characterized in that, The outer surface of the side plate of the staple cartridge base is provided with a side plate groove extending from the proximal side to the distal side, and the middle connecting part of the staple cartridge binding wire is fitted in the side plate groove.

9. The staple cartridge assembly according to claim 2, characterized in that, A distal fixing hole / groove is provided on one side of the distal end of the staple cartridge, and a distal sliding groove of the staple cartridge extending along the width direction is provided on the working surface of the distal end of the staple cartridge. The distal end of the staple cartridge binding wire is fitted with the distal end groove of the staple cartridge with a clearance, and the end of the distal end of the staple cartridge binding wire is connected to the distal end fixing hole / groove.

10. The staple cartridge assembly according to claim 9, characterized in that, The working surface at the distal end of the staple cartridge has a distal end inclined surface, and the distal end slide groove of the staple cartridge is disposed on the distal end inclined surface of the staple cartridge.

11. An anvil assembly, comprising an anvil and an anvil support layer on the working surface of the anvil; Its features are, The anvil support layer is constrained on the working surface of the anvil by a limiting mechanism; The limiting mechanism includes a proximal limiting part, a distal limiting part, and a limiting part connecting part between the proximal limiting part and the distal limiting part; The distal limiting part releases the restriction through the limiting part connecting part and the proximal limiting part in conjunction. The proximal end of the anvil support layer is restricted to the proximal end of the anvil by the proximal end restriction portion, and the distal end of the anvil support layer is restricted to the distal end of the anvil by the distal end restriction portion; When the proximal restricting portion is released from the proximal end of the anvil support layer, the distal restricting portion is correspondingly released from the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-released state.

12. The anvil assembly according to claim 11, characterized in that, The limiting mechanism includes an anvil binding wire; The proximal and distal ends of the anvil support layer are respectively constrained on the proximal and distal ends of the anvil binding wire, and the middle connecting part of the anvil binding wire is located on the side or back of the anvil. Specifically, when the proximal end of the anvil binding wire is cut, the anvil binding wire is in a loose state, the distal end of the anvil binding wire releases the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-release state.

13. The anvil assembly according to claim 12, characterized in that, When the proximal end of the anvil binding wire is cut, the end of the proximal end of the anvil binding wire remains connected to the proximal end of the anvil, and the end of the distal end of the anvil binding wire remains connected to the distal end of the anvil.

14. An anvil assembly, comprising an anvil, an anvil support layer on the working surface of the anvil, a proximal fastening mechanism for limiting a proximal end of the anvil support layer, and a distal fastening mechanism for limiting a distal end of the anvil support layer; Its features are, The distal fastening mechanism includes a proximal fastening part, a distal fastening part, and a fastening part connecting part connected between the proximal fastening part and the distal fastening part. The distal fastening part is released from fastening through the fastening part connecting part in conjunction with the proximal fastening part. The distal end of the anvil support layer is fastened to the distal end of the anvil by the distal fastener; The proximal fastener is fastened to the dorsal side of the distal end of the anvil; When the proximal fastening part is released from the distal end of the anvil, the distal fastening part is correspondingly released from the distal end of the anvil support layer, and the distal end of the anvil support layer is in a pre-released state.

15. The anvil assembly according to claim 14, characterized in that, The remote fastening mechanism includes a remote binding wire; The distal binding suture includes a proximal segment, an intermediate connecting segment, and a distal segment connected in sequence; The ends of the proximal segment and the distal segment are connected to one side of the distal end of the anvil, and the intermediate connecting segment is located on the other side of the distal end of the anvil. The distal segment secures the distal end of the anvil support layer to the distal end of the anvil, and the proximal segment is located on the dorsal side of the distal end of the anvil. When the proximal segment is cut, the distal binding wire is in a loosened state, and the distal end of the anvil support layer is in a pre-released state.

16. The anvil assembly according to claim 15, characterized in that, After the proximal segment is cut, the ends of both the proximal and distal segments remain connected to the distal end of the anvil.

17. The anvil assembly according to claim 15, characterized in that, The working surface at the distal end of the anvil is provided with a distal sliding groove, the back side of the distal end of the anvil is provided with a proximal sliding groove, and the side or back side of the anvil is provided with a transition sliding groove connecting the distal sliding groove and the proximal sliding groove. The proximal slide, the transition slide, and the distal slide are connected in sequence in a U-shape or a C-shape; The proximal section is fitted with the proximal groove with a clearance, the intermediate connecting section is fitted with the transition groove with a clearance, and the distal section is fitted with the distal groove with a clearance.

18. The anvil assembly according to claim 17, characterized in that, The working surface at the distal end of the anvil has a second inclined surface, and the distal groove is disposed on the second inclined surface.

19. An end effector comprising a loading unit, a staple cartridge assembly, and a staple anvil assembly; The loading unit has a firing component; The staple cartridge assembly and the anvil assembly are respectively connected to the far end of the loading unit, and the staple cartridge assembly and the anvil assembly are capable of relative movement; Its features are, The staple cartridge assembly is the staple cartridge assembly according to any one of claims 1-10, and / or the anvil assembly is the anvil assembly according to any one of claims 11-18.

20. A surgical instrument, characterized in that, It includes a handle assembly, an elongated body, and an end effector as described in claim 19, which are sequentially operable from proximal to distal.

21. A surgical instrument, characterized in that, Includes the staple cartridge assembly according to any one of claims 1-10, and / or includes the anvil assembly according to any one of claims 11-18.

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