End execution assembly, initial position holding member and surgical instrument

Abstract

The present invention discloses a distal executor assembly, an initial positioning member, and a surgical instrument, which are related to the field of medical instruments. The distal executor assembly of the surgical instrument includes a proximal main body portion defining a longitudinal axis and a distal executor portion for manipulating tissue. The distal executor portion is pivotally connected to the proximal main body portion via a joint assembly, the joint assembly having a pivot shaft, the proximal main body portion including a curved transmission member, and the joint assembly having a curved drive shaft. The curved transmission member acts on the curved drive shaft to provide a curved driving force to the joint assembly, bending the distal executor portion relative to the longitudinal axis of the proximal main body portion, such that the distal executor portion forms a non-zero angle with respect to the longitudinal axis when the distal executor assembly is in a waiting position for loading. The distal executor portion of the surgical instrument of the present invention can achieve a large angle of bending.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to a Chinese patent application with application number 202211632874.X, entitled "End execution assembly, initial position holding member and surgical instrument," filed with the China Patent Office on December 19, 2022, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of surgical instruments, and more particularly to distal execution assemblies, initial positioning members, and surgical instruments for grasping, cutting, and anastomosing tissue. [Background technology]

[0003] Laparoscopic surgical anastomosis instruments are commonly used in laparoscopic surgery and are suitable for tissue anastomosis and cutting. These instruments typically include a handle assembly, a thin body assembly, and a distal executive assembly. During surgery, a portion of the thin body assembly and the distal executive assembly enter the patient's body through a passage formed by a puncture instrument. By manipulating the handle assembly, the surgeon can bend the distal executive assembly at a certain angle relative to the thin body assembly to accommodate different tissue cutting and anastomosis locations. Certain laparoscopic surgical environments and procedures often require the distal executive assembly to provide a larger bending angle. For example, for mid-low rectal cancer 4 to 10 cm from the anus, surgery is the primary treatment, and the primary procedure is low anterior resection (LAR). Due to the physiological anatomical characteristics of the human body, the pelvic cavity is narrow and rich in nerve plexuses and blood vessels. When performing a low anterior resection, the distal execution assembly must provide a larger curvature angle and a smaller curvature radius, which allows for a single cut of the rectum (see Figure 25), smaller incisions, fewer anastomotic nail placement, and a reduced risk of anastomotic leakage and postoperative complications.

[0004] A conventional distal executor assembly 50 (see FIGS. 1 and 2) includes a proximal main body portion 50a and a distal executor portion 50b, which are pivotally connected via a joint assembly 50c. The distal executor portion 50b can bend at a certain angle to the left (LA) or right (RA) relative to a longitudinal axis C defined by the proximal main body portion 50a. A joint design that provides such a symmetrical bending angle is limited by the structure of the joint assembly 50c, such as mechanical interference between components, and the maximum bending angle typically does not exceed 50 degrees. Furthermore, conventional designs of distal executor assemblies that employ bi- or multi-joints to achieve large bending angles can provide larger bending angles by sequentially bending multiple pivot axes, but this increases the length of the joint portion and increases the bending radius of the distal executor assembly, making them unsuitable for narrow surgical environments such as the pelvic cavity. Summary of the Invention [Problem to be solved by the invention]

[0005]

[0006] For this reason, the present invention proposes a distal execution assembly for a surgical instrument and a surgical instrument that can achieve a large bending angle. [Means for solving the problem]

[0007] To address the above technical problems, the present invention provides the following technical solutions.

[0008] 1. A distal effector assembly adapted for a surgical instrument, comprising: a proximal main body portion for defining a longitudinal axis; and a distal effector portion for manipulating tissue, said distal effector portion pivotally connected to said proximal main body portion via an articulation assembly, said articulation assembly defining a pivot axis, said proximal main body portion including a curved transmission member, said articulation assembly being provided with a curved drive shaft, said curved transmission member pivotally connected to said curved drive shaft, said curved transmission member operable for reciprocal movement along the longitudinal axis, thereby pivoting said curved drive shaft about said pivot axis and pivoting said distal effector portion about said pivot axis, and further wherein said distal effector portion forms a non-zero angle with said longitudinal axis when said distal effector assembly is in a ready to load position.

[0009] In some embodiments of the present invention, when the distal end enforcement portion extends along the longitudinal axis, a line connecting the axis of the curved drive shaft and the pivot shaft forms a non-zero angle with the longitudinal axis.

[0010] In some embodiments of the present invention, when the distal end enforcement portion extends along the longitudinal axis, the curved drive shaft is located at a proximal end or a distal end of the pivot shaft.

[0011] In some embodiments of the invention, when the distal execution assembly is in the ready position, the articulation assembly pivots so that a line connecting the axis of the curved drive shaft and the axis of the pivot shaft is perpendicular to the longitudinal axis.

[0012] In some embodiments of the present invention, during the movement of the curved transmission member from the starting position to the end position, the distal execution part is pivoted about the pivot shaft and gradually moves away from the longitudinal axis.

[0013] In some embodiments of the present invention, when the curved transmission member is in the starting position, the distal end execution portion extends along the longitudinal axis.

[0014] In some embodiments of the present invention, when the end execution assembly is in the loading standby position, the curved transmission member is in an intermediate position in the course of movement from the start position to the end position.

[0015] In some embodiments of the present invention, the distal execution portion further includes a restricting passage for restricting a bending position of the striking member during a striking movement of the striking member in a bent state, the restricting passage being located in a mating region between the proximal main body portion and the joint assembly, and the striking member being located inside the restricting passage and moving along the extending direction of the restricting passage.

[0016] In some embodiments of the present invention, the restricting passage is formed by a first restricting portion and a second restricting portion located on either side of the embossing member, respectively.

[0017] In some embodiments of the present invention, the first limiting portion includes a first limiting protrusion provided on the curved transmission member, the first limiting protrusion having an inner concave arc surface that matches the maximum curved outer arc surface of the stamping member, and the second limiting portion includes a second limiting protrusion provided on the joint assembly, the second limiting protrusion having an outer convex arc surface that matches the maximum curved inner arc surface of the stamping member.

[0018] In some embodiments of the present invention, the first limiting portion includes a limiting member provided on the proximal main body portion, the limiting member having an inner concave arc surface that matches the maximum curvature outer arc surface of the driving member, and the second limiting portion is an outer convex arc surface provided on the distal end of the curved transmission member, the outer convex arc surface that matches the maximum curvature inner arc surface of the driving member.

[0019] In some embodiments of the present invention, a receiving groove is provided in the distal end region of the striking member, and when the bending angle of the distal end execution portion is less than a set value, a partial region of the first limiting portion is received in the receiving groove.

[0020] In some embodiments of the present invention, the joint assembly includes a first connecting member and a second connecting member, the first connecting member and / or the second connecting member is provided with the pivot shaft, and the first connecting member and the second connecting member are connected via two connecting shafts located on opposite sides of the pivot shaft, one of which is a curved driving shaft suitable for mating with the curved transmission member.

[0021] In some embodiments of the present invention, the device further includes an initial position maintaining member, which supports the distal executor portion and the proximal main body portion and is used to maintain the distal executor portion in an initial curved state having a set angle relative to the proximal main body portion.

[0022] In some embodiments of the present invention, the initial position maintaining member includes a support main body having a set bending angle, the support main body including a first holding arm that is interlocked with the proximal main body part and a second holding arm that is interlocked with the distal execution part, and further including a support beam connected between the first holding arm and the second holding arm.

[0023] In some embodiments of the present invention, the initial position retaining member is provided with a limiting structure for mating with the stamping member, the limiting structure being suitable for mating with a working portion of the stamping member and limiting the position of the stamping member.

[0024] In some embodiments of the present invention, the distal execution section includes a nail lock assembly and a nail anvil assembly pivotally connected, and the distal ends of the nail lock assembly and the nail anvil assembly are respectively provided with positioning structures that match each other, and the positioning structures are used to limit the widthwise positions of the nail lock assembly and the nail anvil assembly when the distal execution section is in a closed position.

[0025] In some embodiments of the present invention, the positioning structure includes a positioning protrusion provided on one of the nail lock assembly and the nail anvil assembly, and a positioning groove provided on the other of the nail lock assembly and the nail anvil assembly.

[0026] The present invention also provides a distal executive assembly adapted for a surgical instrument, comprising a proximal main body portion for defining a longitudinal axis and a distal executive portion for manipulating tissue, the distal executive portion pivotally connected to the proximal main body portion via a joint assembly, the joint assembly defining a pivot axis, and comprising a curved transmission member, the joint assembly being provided with a curved drive shaft, the curved transmission member acting on the curved drive shaft to provide a curved driving force to the joint assembly, causing the distal executive portion to bend in one direction relative to the longitudinal axis of the proximal main body portion, the distal executive portion being deflected in one direction away from the longitudinal axis and being convertible between an extended position, an intermediate bend angle position and a maximum bend angle position, the distal executive portion being in the intermediate bend angle position being the loading standby position of the distal executive assembly.

[0027] The present invention also provides a surgical instrument, including a main body portion and a distal execution assembly as described above selectively joined to the main body portion.

[0028] The present invention also provides a surgical instrument comprising an elongated body assembly defining a longitudinal axis and a distal executive portion for manipulating tissue, the distal executive portion pivotally connected to the elongated body assembly via a joint assembly, the joint assembly being provided with a pivot shaft, the surgical instrument comprising a curved transmission member, the joint assembly being provided with a pivot shaft, the joint assembly being provided with a curved drive shaft, the curved transmission member acting on the curved drive shaft to provide a curved drive force to the joint assembly, bending the distal executive portion relative to the longitudinal axis of the proximal main body portion, the curved drive shaft being located at the proximal or distal end of the pivot shaft when the distal executive portion extends along the longitudinal axis.

[0029] The present invention also provides a surgical instrument comprising an elongated body assembly defining a longitudinal axis and a distal executive section for manipulating tissue, the distal executive section pivotally connected to the elongated body assembly via a joint assembly, the joint assembly being provided with a pivot shaft, and a curved transmission member, the joint assembly being provided with a curved drive shaft, the curved transmission member acting on the curved drive shaft to provide a curved driving force to the joint assembly, bending the distal executive section unilaterally relative to the longitudinal axis of the proximal main body section, the distal executive section deflecting in a unilateral direction away from the longitudinal axis and being convertible between an extended position, an intermediate bend angle position, and a maximum bend angle position, the distal executive section being in the intermediate bend angle position being the initial position of the distal executive assembly.

[0030] At the same time, the present invention provides an initial position holding member adapted to a surgical instrument, which includes a support body having a set bending angle, and holds the distal execution portion of the distal execution assembly in an initial bending state having a set angle relative to the longitudinal axis.

[0031] In some embodiments of the present invention, the support body is adapted to mate with an end enforcement assembly of a surgical instrument, and includes a first holding arm adapted to mate with a proximal main body portion of the end enforcement assembly and a second holding arm adapted to mate with a distal enforcement portion of the end enforcement assembly, wherein the angle between the first holding arm and the second holding arm is an obtuse angle.

[0032] In some embodiments of the present invention, the support main body is adapted to mate with an end enforcement assembly and an elongate body assembly of a surgical instrument, and includes a first holding arm that mates with a proximal main body portion of the end enforcement assembly and a second holding arm that mates with the elongate body assembly, wherein the angle between the first holding arm and the second holding arm is an obtuse angle. [Effects of the Invention]

[0033] The technical solution of the present invention has the following technical advantages over the prior art:

[0034] In the surgical instrument and its distal execution assembly provided by the present invention, the proximal main body and the distal execution part are pivotally connected via a joint assembly, and a bending transmission member located on the proximal main body acts on the bending drive shaft to provide a bending driving force to the joint assembly, bending the distal execution part relative to the longitudinal axis of the proximal main body. When the distal execution part extends along the longitudinal axis, the bending drive shaft is located at the proximal or distal end of the pivot shaft. This increases the travel distance of the bending transmission member, and the travel distance of the bending transmission member is positively correlated with the bending angle of the distal execution part. The above-described structure of the present invention allows the bending angle of the distal execution part to reach 0 to 90 degrees, and is particularly suitable for endoscopic surgery, which requires a large bending angle of the distal execution part. [Brief explanation of the drawings]

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which will help to understand the objects and advantages of the present invention. [Figure 1] FIG. 1 is a structural schematic diagram of a distal execution assembly of a surgical instrument in the prior art. [Figure 2A] FIG. 2A is a structural schematic diagram showing three bending states of the distal execution assembly of a surgical instrument in the prior art. [Figure 2B-C] 2B-C show the travel distance of the bending transmission member in the longitudinal axis direction when the distal execution assembly of a prior art surgical instrument goes from the initial load standby position to the maximum bending angle. [Figure 3] FIG. 3 is a structural schematic diagram of a surgical instrument provided by a specific embodiment of the present invention. [Figure 4] FIG. 4 is a structural schematic diagram of the main body of a surgical instrument according to a specific embodiment of the present invention. [Figure 5] FIG. 5 is a schematic diagram showing the connection relationship between the end enforcement assembly and the main body part provided by a specific embodiment of the present invention. [Figure 6] FIG. 6 is a structural schematic diagram of a terminal enforcement assembly provided in a specific embodiment of the present invention. [Figure 7]FIG. 7 is an exploded view of some components of the elongate body assembly of a surgical instrument provided by a specific embodiment of the present invention. [Figure 8] FIG. 8 is an exploded view of some components of the elongate body assembly and handle assembly of a surgical instrument provided by a specific embodiment of the present invention. [Figure 9] FIG. 9 is an exploded view of a terminal enforcement assembly provided by a specific embodiment of the present invention. [Figure 10] FIG. 10 is an exploded view of the structure of a portion of the articulation assembly and the launch member of the distal execution assembly provided by a specific embodiment of the present invention. [Figure 11A-B] 11A-B are structural schematic diagrams of a distal enforcement part and a proximal main body part of a distal enforcement assembly provided by a specific embodiment of the present invention, which extend in the same direction. [Figure 12A-B] 12A-B are structural schematic diagrams of the end enforcement assembly provided by a specific embodiment of the present invention in its initial state (loading standby position). [Figure 13A-B] 13A-B are structural schematic diagrams of the distal enforcement part of the distal enforcement assembly provided by a specific embodiment of the present invention when the distal enforcement part is at the maximum bending angle. [Figure 14A] FIG. 14A is another structural schematic diagram of the distal enforcement part and the proximal main body part of the distal enforcement assembly provided by a specific embodiment of the present invention, where the distal enforcement part and the proximal main body part extend in the same direction. [Figure 14B] FIG. 14B is another structural schematic diagram of the initial state (loading standby position) of the end enforcement assembly provided by a specific embodiment of the present invention. [Figure 14C] FIG. 14C is another structural schematic diagram of the distal enforcement part of the distal enforcement assembly provided by a specific embodiment of the present invention when it is at the maximum bending angle. [Figure 15A] FIG. 15A shows the movement distance of the bending transmission member in the longitudinal axis direction when the terminal execution assembly provided by the specific embodiment of the present invention reaches the maximum bending angle from the initial state (loading standby position). [Figure 15B]FIG. 15B shows the movement distance of the curved transmission member in the longitudinal axis direction when the distal execution assembly provided by the specific embodiment of the present invention moves from the initial state (loading standby position) to the extended state. [Figure 16A] FIG. 16A is a structural schematic diagram of a distal enforcement part and a proximal main body part of a distal enforcement assembly provided by another embodiment of the present invention, which extend in the same direction. [Figure 16B] FIG. 16B is a structural schematic diagram of the end enforcement assembly provided by another specific embodiment of the present invention in its initial state (loading standby position). [Figure 16C] FIG. 16C is a structural schematic diagram of the distal enforcement part of the distal enforcement assembly provided by another specific embodiment of the present invention when it is at the maximum bending angle. [Figure 17A] FIG. 17A shows the movement distance of the bending transmission member in the longitudinal axis direction when the terminal execution assembly provided by another specific embodiment of the present invention reaches the maximum bending angle from the initial state (loading standby position). [Figure 17B] FIG. 17B shows the movement distance of the curved transmission member in the longitudinal axis direction when the distal execution assembly provided by another specific embodiment of the present invention moves from the initial state (loading standby position) to the extended state. [Figure 18] FIG. 18 is a structural schematic diagram of an initial position maintaining member provided in a specific embodiment of the present invention. [Figure 19] FIG. 19 is a top view of an initial position-retaining member provided by a specific embodiment of the present invention. [Figure 20] FIG. 20 is a cross-sectional view taken along line AA in FIG. [Figure 21] FIG. 21 is an assembly diagram of a terminal enforcement assembly provided by a specific embodiment of the present invention. [Figure 22] FIG. 22 is an enlarged view of part A in FIG. [Figure 23] FIG. 23 is a structural schematic diagram of the nail holder bottom seat and the nail anvil bottom seat in the end execution assembly provided by a specific embodiment of the present invention. [Figure 24] FIG. 24 is a structural schematic diagram of a surgical instrument provided by another specific embodiment of the present invention. [Figure 25]Figure 25 is a schematic diagram of the LAR surgical procedure. DETAILED DESCRIPTION OF THE INVENTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that can be obtained by those skilled in the art without any creative efforts fall within the protection scope of the present invention.

[0037] In describing the present invention, it should be noted that the orientations or positional relationships indicated by terms such as "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," and "outside" are based on the orientations or positional relationships shown in the drawings and are used to facilitate and simplify the description of the present invention. These terms do not imply that the referenced devices or elements must have a particular orientation, be configured, or operate in a particular orientation, and should not be construed as limitations of the present invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] In describing the present invention, unless otherwise clearly specified or limited, the terms "installed," "coupled," and "connected" should be interpreted broadly. For example, they may be fixedly connected, detachably connected, or integrally connected. They may also be directly connected, indirectly connected via an intermediary, or internally communicated between two elements. Those skilled in the art will understand the specific meanings of the above terms in the present invention depending on the specific circumstances.

[0039] Furthermore, in the different embodiments of the present invention described below, the technical features involved can be combined with each other as long as they do not conflict with each other.

[0040] In each embodiment of the present invention, the "distal end / side" refers to the end of the surgical instrument that is farther from the operator when operating the surgical instrument, and the "proximal end / side" refers to the end / side that is closer to the operator when operating the surgical instrument.

[0041] The following are specific embodiments of surgical instruments. Generally, the examples of surgical instruments described herein are endoscopic surgical cutting and anastomosis instruments. However, the surgical instruments are not limited to endoscopic surgical cutting and anastomosis instruments, and may be, for example, open surgical instruments used in open surgery.

[0042] Specifically, one embodiment of a surgical instrument 100 shown in FIG. 3 includes a handle assembly 10, an elongated body assembly 20, and a distal executor assembly 30, arranged in this order from the proximal end to the distal end. The elongated body assembly 20 defines a longitudinal axis C and extends distally from the distal end of the handle assembly 10, and the distal executor assembly 30 is joined to the distal end of the elongated body assembly 20 in a detachable or non-detachable manner. The handle assembly 10 is adapted for operation of the surgical instrument 100 by an operator, and the handle assembly 10 controls the distal executor assembly 30 via the elongated body assembly 20 to perform surgical operations such as grasping / closing, suturing / anastomosis, and cutting of tissue. The handle assembly 10 includes a handle main body that can be grasped by an operator in a conventional manner. In a specific embodiment, the surgical instrument 100 operates to close and eject the distal executor assembly via a trigger. Alternatively, the surgical instrument 100 operates to close and eject the distal executor assembly 30 via a push knob, button, or the like provided on the handle main body, causing the distal executor assembly 30 to perform cutting and suturing operations. The elongated body assembly 20 has an elongated tubular shape and is suitable for transmitting the driving force provided by the handle assembly to the distal end of the surgical instrument 100.

[0043] It should be noted that although the embodiments of the surgical instruments described herein comprise distal executor assemblies for cutting and anastomosing tissue, alternative embodiments may comprise other techniques for cutting and anastomosing tissue, such as using a distal executor that utilizes radio frequency (RF) energy or adhesives to anastomose tissue.

[0044] The surgical instrument 100 according to the present embodiment further includes a rotation head 25, which is located distally of the handle assembly 10 and disposed at the proximal end of the elongate body assembly 20. When the rotation head 25 is manipulated to rotate about the longitudinal axis C of the surgical instrument 100, the elongate body assembly 20 and the distal execution assembly 30 can be rotated together.

[0045] To enable the distal executive assembly 30 to bend at a set angle relative to the longitudinal axis C of the elongated body assembly 20, the distal executive assembly 30 includes a proximal main body portion 30a and a distal executive portion 30b, which are pivotally connected via a joint assembly 30c. Correspondingly, the surgical instrument 100 further includes a curved drive assembly 21 and a curved transmission assembly 23 for driving the curved joint assembly 30c (see FIG. 7). The curved transmission assembly 23 includes a curved transmission frame 231 and a curved link 232, the curved transmission frame 231 being connected to the proximal end of the curved link 232 and operably connected to the curved drive assembly 21. The curved drive assembly 21 includes a curved knob 210 and a curved drive member 211 mounted on the rotating head 25, the curved drive member 211 being connected to the curved transmission frame 231. When the operator rotates the curved knob 210, the curved drive member 211 can be moved. Specifically, when the bending knob 210 is rotated clockwise from the initial position, the bending drive member 211 moves the bending link 232 to the distal end, and when the bending knob 210 is rotated counterclockwise from the initial position, the bending drive member 211 moves the bending link 232 to the proximal end, and vice versa.

[0046] The surgical instrument 100 can operate the closure and firing of the distal execution portion 30b via a button 101 provided on the handle assembly 10, causing the distal execution portion 30b to perform tissue cutting and suturing operations. Specifically, as shown in FIGS. 7 and 8 , the handle assembly 10 includes a drive mechanism 12 provided within a handle shell 11, which provides output power to the surgical instrument 100. The elongated body assembly 20 includes a sleeve 201, within which a firing rod 22 is provided. The firing rod 22 is operably coupled to the drive mechanism 12 and is driven by the drive mechanism 12 to reciprocate along a longitudinal axis C, thereby realizing the firing (advancing) and retracting functions of the surgical instrument 100. More specifically, the elongated body assembly 20 includes a support member 202 for slidably supporting the firing rod 22 and the curved link 232. A tubular shell is provided at the distal end of the support member 202, which is used to couple with the proximal connecting end of the distal execution assembly 30. 5, a connecting plate 361 is provided at the proximal end of the curved transmission member 36 of the distal execution assembly 30, which mates with a connecting hook portion 2321 located at the distal end of the curved link 232. A connecting portion 353 is provided at the proximal end of the launch member 35 in the distal execution assembly 30, which mates with the distal end of the launch rod 22, thereby realizing rotational engagement and locking of the distal execution assembly 30 and the elongated body assembly 20. Furthermore, the handle assembly 10 includes a power source 13, which provides power to the drive mechanism 12. The power source 13 may be replaceable and / or rechargeable.

[0047] 9 and 10, a specific embodiment of the distal executive assembly 30 of the surgical instrument 100 according to the present invention will be described in detail. The distal executive assembly 30 is detachably attached to the distal end of the elongated body assembly 20 of the surgical instrument 100. As described above, the distal executive assembly 30 includes a proximal main body portion 30a and a distal executive portion 30b, which are pivotally connected via a joint assembly 30c. The proximal main body portion 30a of the distal executive assembly 30 is inserted into the elongated body assembly 20 in an insertion manner and can be rotated relative to the outer shell of the elongated body assembly 20 to lock the distal executive assembly 30 thereon. The distal executive portion 30b includes a nail set assembly 31 and a nail anvil assembly 32, which move relative to each other to close the forceps jaws and thereby grasp tissue. In one specific embodiment, the nail holder assembly 32 operably pivots toward the nail holder assembly 31 until the jaws of the distal executive assembly 30 close and grasp tissue. The nail holder assembly 32 pivots away from the nail holder assembly 31 until the jaws of the distal executive assembly 30 open and release tissue. In an alternative embodiment, the nail holder assembly 31 of the distal executive assembly 30 operably pivots toward the nail holder assembly 32 until the jaws of the distal executive assembly 30 close and grasp tissue. The nail holder assembly 31 operably pivots away from the nail holder assembly 31 until the jaws of the distal executive assembly 30 open and release tissue.

[0048] The nail lock assembly 31 includes a nail lock base seat 311, a nail lock 312, and a driving slider 316 disposed in a cavity between the nail lock 312 and the nail lock base seat 311. Specifically, the nail lock base seat 311 is connected to the joint assembly 30c, and the nail lock 312 is a disposable part and detachably connected to the nail lock base seat 311. In another optional embodiment, the nail lock base seat 311 and the nail lock 312 of the nail lock assembly 31 are fixedly connected or integrally molded and detachably connected to the elongated body assembly 20 as a single part. The nail lock base seat 311 is shaped as an open shell structure with a U-shaped or semicircular cross section and is connected to the distal end of the elongated body assembly 20. The nail lock 312 is inserted into the nail lock base seat 311 by a fastening method or the like. The nail lock 312 is shaped like an elongated base, and the side away from the nail lock base seat 311 is used for interfacing with tissue. The side of the nail holder 312 that engages with tissue (also referred to as the nail face) is provided with a cutting knife groove extending from the proximal end to the distal end of the nail holder 312. This cutting knife groove is suitable for passage of a cutting knife 354 to cut tissue gripped between the contact surface and the nail holder assembly 32 along the proximal end to the distal end of the nail holder 312. In one embodiment, the cutting knife groove is located at a central position on the top surface of the nail holder 312, and the nail holder 312 is separated into a first nail region and a second nail region by the cutting knife groove. Each of the first nail region and the second nail region of the nail holder 312 is provided with at least two rows of nail holes, and the number of rows of nail holes can be two, three, or more depending on the surgical situation. Each row of nail holes is provided with a plurality of nail holes, which are aligned along the longitudinal axis of the nail holder 312 and are used to accommodate suture nails and nail drivers. The nail driver attaches a suture nail to the nail holder 312 on the side facing the nail projection surface. As the driving slider 316 slides / moves in the longitudinal axis direction, the nail driver sequentially implants the suture nail into the tissue from the proximal side to the distal side, achieving suturing. The nail anvil assembly 32 includes an anvil cover 321 and an anvil seat body located within the anvil cover 321. A plurality of nail receiving portions are provided on the surface of the anvil seat body, and the nail receiving portions correspond one-to-one to the positions of the nail holes on the nail holder 312. During tissue anastomosis, the suture nail in the nail projection hole abuts against the nail receiving portions.

[0049] When the distal execution part 30b is closed, the nail lock assembly 31 and the nail anvil assembly 32 located at the distal end will undergo a certain swing in the width direction, causing a slight misalignment between the nail receiving part in the nail anvil assembly and the nail hole in the nail lock 312, thereby reducing the stitching effect. To avoid this, in the above-mentioned distal execution assembly of the present invention, the distal ends of the nail lock assembly 31 and the nail anvil assembly 32 are provided with positioning structures that match each other, and the positioning structures are used to limit the widthwise positions of the nail lock assembly 31 and the nail anvil assembly 32 when the distal execution part is in the closed position. Specifically, in an optional embodiment, as shown in Figures 21 to 23, positioning protrusions 311a are provided on both side walls of the nail lock base seat 311 of the nail lock assembly 31 along the thickness direction, and positioning grooves 321a or notch structures are provided at corresponding positions on the anvil cover 321 of the nail anvil assembly. The positioning protrusion 311a is inserted into the positioning groove 321a to form a positioning structure, which limits the widthwise position of the nail lock assembly 31, ensures accurate alignment of the two, and improves the stitching effect. In another alternative embodiment, the positioning protrusion is provided on the nail lock assembly 32, and the positioning groove is provided on the nail lock assembly 31, and they are aligned to similarly function to limit the widthwise positions of the nail lock assembly 31 and the nail lock assembly 32.

[0050] 9, the proximal main body portion 30a of the distal execution assembly 30 includes an elongated outer tube 33, an inner tube 34 disposed within the outer tube 33, a ramming member 35 slidably connected to the inner tube 34, and a curved transmission member 36. The inner tube 34 is formed by a first half tube 34a and a second half tube 34b. The proximal end of the first half tube 34a includes a joint portion 34c for connecting to the elongated body assembly 20. The joint portion 34c is provided with a connecting convex lug 343 and is releasably joined to the elongated body assembly 20 in an engaging connection manner. The first half tube 34a and the second half tube 34b define a slide passage for slidably receiving the ramming member 35. The ramming member 35 includes an elongated ramming beam 351, which may be formed from a single flexible piece of material or, preferably, from multiple laminated pieces of material. A working portion 352 is provided at the distal end of the striking beam 351, and a cutting knife 354 is provided on the working portion 352 to form an incision in the target tissue during the striking process. The working portion 352 of the striking member 35 is shaped like a "U" beam, with a portion of the working portion contacting the slider 316 and sliding integrally toward the distal end of the nail holder 312 to perform the corresponding surgical operation. For example, when the striking member 35 is driven to move from the proximal end to the distal end, a portion of the working portion 352 of the striking member 35 pushes the slider 316 toward the distal end, and the slider 316 acts on the nail driver to push the suture nail out of the nail holder 312, thereby achieving the tissue anastomosis operation. At the same time, the cutting knife 354 on the working portion 352 cuts the tissue. A connecting portion 353 is provided at the proximal end of the striking beam 351, and the connecting portion 353 is shaped like a bushing with an opening. The proximal end of the connecting portion 353 is provided with a port configured to receive the distal end of the launch rod 22 when the proximal end of the distal execution assembly 30 is mated with the elongate body assembly 20 .

[0051] 9 and 10, the joint assembly 30c includes a first connecting member 371 and a second connecting member 372, and a pivot shaft 371c is defined on the first connecting member 371. A pivot support piece 341 is fixedly connected to the distal end of the inner tube 34, and the distal end of the pivot support piece 341 is pivotally connected to the pivot shaft 371c, thereby pivotally connecting the joint assembly 30c to the proximal main body part 30a and allowing the distal execution part 30b to pivot operably relative to the proximal main body part 30a. In an alternative embodiment, to enhance the stability of the pivotal movement of the distal execution part 30b relative to the proximal main body part 30a, the first connecting member 371 and the second connecting member 372 are provided with corresponding coaxial pivot shafts 371c and 372c, respectively, and the first half-tube 34a and the second half-tube 34b are also provided with pivot support pieces 341 and 342, respectively. The distal ends of the pivot support pieces 341 and 342 are pivotally connected to corresponding pivot shafts 371c and 372c, respectively.

[0052] 10 , the first connecting member 371 and the second connecting member 372 are connected via two connecting shafts 372a and 372b located on opposite sides of the pivot shaft 371c. Specifically, the connecting shafts 372a and 372b are fixedly installed on the second connecting member 372, and the first connecting member 371 has corresponding holes 371a and 371b. The connecting shafts 372a and 372b are fixedly connected to the holes 371a and 371b of the first connecting member 372 by riveting, welding, or the like. Alternatively, in an alternative embodiment, the first connecting member 371 and the second connecting member 372 have corresponding holes, and both ends of the connecting shafts 372a and 372b are fixedly connected to the first connecting member 371 and the second connecting member 372 by riveting, welding, or the like. Furthermore, any connecting shaft 372a of the joint assembly 30c is suitable for mating with a hole at the distal end of the curved transmission member 36, thereby converting the motion along the longitudinal axis C provided by the curved transmission member 36 into pivotal motion about the pivot axis 371c and / or pivot axis 372c of the joint assembly 30c. To more clearly describe the specific technical solution of the present invention, the connecting shaft 372a joining the curved transmission member 36 will be referred to as the curved drive shaft 372a. The distal end of the curved transmission member 36 in the proximal main body 30a is pivotally connected to the curved drive shaft 372a. Next, with reference to FIGS. 11 to 15, the articulation process of the distal execution assembly 30 provided by the embodiment of the present invention will be described in detail.

[0053] 11A and 11B, when the distal-end execution portion 30b extends in the direction of the longitudinal axis C, i.e., when the distal-end execution portion 30b extends in the same direction as the proximal-end main body portion 30a, the angle between the distal-end execution portion 30b and the longitudinal axis C is 0° or approximately 0°, and the bending drive shaft 372a is located at the proximal end of the pivot shaft 371c. By operating the bending knob 210 of the surgical instrument 100, the bending transmission member 36 is moved distally (in the direction of the arrow DD), and the bending drive shaft 372a is pivoted around the pivot shaft 371c, bending the distal-end execution portion 30b gradually away from the longitudinal axis C, and finally reaching the position / state of the maximum single-side bending angle (see FIGS. 13A and 13B). When the distal end executor 30b forms a certain angle with the longitudinal axis C during bending away from the longitudinal axis C, the distal end executor assembly 30 provided by the embodiment of the present invention is in an unloaded or unused initial state / position (hereinafter referred to as the loading standby position), as shown in Figures 12A and 12B. When the distal end executor assembly 30 is in the loading standby position, it can be inserted into and attached to the distal end of the elongated body assembly 20 of the surgical instrument 100.

[0054] As can be appreciated, the maximum bending angle that the distal executor assembly can provide is limited not only by the mechanical interference of the associated components within the distal executor assembly, but also by the maximum travel that the bending link 232 can provide in the handle assembly and elongate body assembly of the surgical instrument.

[0055] In order for the distal executor assembly 30 described in the embodiment of the present invention to be compatible with the main body portion (including the handle assembly and the elongated body assembly) of a surgical instrument in the prior art, that is, for the distal executor assembly 30 described in the embodiment of the present invention to be compatible with the main body portion (including the handle assembly and the elongated body assembly) of the same surgical instrument as the distal executor assembly 50 (see FIG. 1) of the same standard dimensions in a conventional design, in one specific embodiment, referring to FIGS. 12A and 12B, when the distal executor assembly 30 is in the loading standby position, when the line S connecting the axis of the curved drive shaft 372a of the joint assembly 30c and the axis of the pivot shaft 371c is perpendicular to the vertical axis C, the distal executor portion 30b forms a first angle RA1 set with the vertical axis C.

[0056] Specifically, after the distal executor assembly 30 in the loading standby position is attached to the elongated body assembly 20 of the surgical instrument 100, the bending knob 210 of the handle assembly 10 is operated to move the bending link 232 distally a first distance, and correspondingly, the bending transmission member 36 also moves distally by L1. As a result, the distal executor portion 30b of the distal executor assembly 30, already bent at the first angle RA1, further bends in a direction away from the longitudinal axis C to reach a second angle RA2. Similarly, after the distal executor assembly 30 in the loading standby position is attached to the elongated body assembly 20 of the surgical instrument 100, the bending knob 210 of the handle assembly 10 is operated to move the bending link 232 proximally a second distance. Correspondingly, the curved transmission member 36 is also driven to move by L2 toward the proximal end, causing the distal execution part 30b of the distal execution assembly 30 to pivot further toward the longitudinal axis C from the state where it is already curved at the first angle RA1, and finally to become 0° or nearly 0° from the longitudinal axis C, making it easier for the distal execution assembly 30 to pass through the puncture instrument. Here, the first distance and the second distance may be the same or different.

[0057] When the distal executor assembly 30 according to the embodiment of the present invention is adapted to a conventional surgical instrument, the first distance corresponds to the distance the bending link travels when bending the distal executor assembly 50 to the right at the maximum angle RA, and the second distance corresponds to the distance the bending link travels when bending the distal executor assembly 50 to the left at the maximum angle LA. The above-described configuration of the distal executor assembly 30 further enhances the versatility and adaptability of the distal executor assembly according to the embodiment of the present invention.

[0058] 15A, when the bending knob 210 is rotated clockwise from the initial position to the maximum rotation position, the bending link 232 moves a first distance toward the distal end, and the bending drive shaft 372a moves L1 toward the distal end along the longitudinal axis C, so that the distal-end execution part 30b bends from the first angle RA1 to the maximum bending angle RA2. Referring to FIG. 15B, when the bending knob 210 is rotated counterclockwise from the initial position to the maximum rotation position, the bending drive member 211 moves the bending link 232 a second distance toward the proximal end, and the bending drive shaft 372a moves L2 toward the proximal end along the longitudinal axis C, so that the distal-end execution part 30b extends from the initial first angle RA1 in the same direction as the longitudinal axis C, i.e., the bending angle is 0° or approximately 0°. Therefore, when the curved transmission member 36 moves L1+L2 toward the distal side along the longitudinal axis C, or when the curved transmission member 36 is operated from the proximal starting position to the distal end position along the longitudinal axis C, the angle between the distal end execution portion 30b and the longitudinal axis C changes from 0° or approximately 0° to the maximum bending angle RA2.

[0059] 16-17, in an alternative embodiment, the bending drive shaft 672a of the distal executor assembly 60 is pivotally connected to the distal end of the bending transmission member 66. When the bending transmission member 66 is operatively pulled toward the proximal side, the distal executor section 60b and the joint assembly 60c are bent relative to the proximal main body section 60a. Specifically, referring to FIG. 16A, the angle between the longitudinal axis C defined by the distal executor section 60b and the proximal main body section 60a is 0° or approximately 0°, and the bending drive shaft 672a is located at the distal end of the pivot shaft 671c. By operating the bending knob 210, the bending transmission member 66 is moved toward the proximal side, pivoting the bending drive shaft 672a about the pivot shaft 671c, and bending the distal executor section 60b to a maximum angle in a direction gradually away from the longitudinal axis C (see FIG. 16C). Similarly, in order for the distal executor assembly 60 to be compatible with the main body (including the handle assembly and the elongated body assembly) of a conventional surgical instrument and to make the most of the maximum stroke that the curved link 232 can provide, the state / position of the distal executor assembly 60 shown in Figure 16B is defined as an unloaded or unused initial state / position (hereinafter referred to as a loading standby position). At this time, a line S connecting the axis of the curved drive shaft 672a of the distal executor assembly 60 and the axis of the pivot shaft 671c is perpendicular to the longitudinal axis C.

[0060] After the distal execution assembly 60 in the ready-to-load position is attached to the elongated body assembly 20 of the surgical instrument 100, the curved knob 210 of the handle assembly 10 is operated to move the curved link 232 proximally a third distance, which correspondingly drives the curved transmission member 66 to move proximally a distance L3. As a result, the distal execution portion 60b of the distal execution assembly 60, already bent at the third angle RA3, further bends in a direction away from the longitudinal axis C to reach a fourth angle RA4. Similarly, after the distal execution assembly 60 in the ready-to-load position is attached to the elongated body assembly 20 of the surgical instrument 100, the curved knob 210 of the handle assembly 10 is operated to move the curved link 232 distally a fourth distance, which correspondingly drives the curved transmission member 66 to move distally a distance L4. As a result, the distal end enforcement portion 60b of the distal enforcement assembly 60 pivots from its already bent state at the third angle RA3 in a direction closer to the longitudinal axis C, and finally reaches 0° or nearly 0° with the longitudinal axis C, making it easier for the distal enforcement assembly 60 to pass through the lancing device. Here, the third distance and the fourth distance may be the same or different.

[0061] 17A , in a specific embodiment, when the bending knob 210 is rotated clockwise from the initial position to the maximum rotation position, the bending link 232 moves a third distance toward the proximal end, and the bending drive shaft 372a moves a distance L3 toward the proximal end along the longitudinal axis C, so that the distal-end execution part 30b is bent to the maximum bending angle. When the bending knob 210 is rotated counterclockwise from the initial position to the maximum rotation position, the bending drive member 211 moves the bending link 232 a fourth distance toward the distal end, and the bending drive shaft 372a moves a distance L4 toward the distal end along the longitudinal axis C, so that the distal-end execution part 30b extends in the same direction as the longitudinal axis C, i.e., the bending angle is 0° or approximately 0°. Therefore, when the curved transmission member 36 moves proximally along the direction of the vertical axis C by L3+L4, or when the curved transmission member 36 is operated from the distal starting position to the proximal end position along the vertical axis C, the angle between the distal end execution portion 30b and the vertical axis C changes from 0° or approximately 0° to the maximum bending angle RA4.

[0062] Of course, it can be understood that, based on the concept of the present invention, the end position of the curved transmission member 36, 66 is not limited to the position where the far-end execution part 30b extends along the vertical axis C, i.e., the position where the angle between the far-end execution part 30b and the vertical axis C is 0° or approximately 0°, but may also be a position where it forms a small angle with the vertical axis C, or a position where it is deflected to the left or right according to the needs of the actual situation.

[0063] 2B-C, in the prior art distal enforcement assembly 50, rotating the articulation knob 210 clockwise from the initial position to the maximum rotation position moves the articulation link 232 a fifth distance toward the distal end, and further moves the articulation transmission member 56 and the articulation drive shaft 572a toward the distal end by L5 along the longitudinal axis C, bending the distal enforcement unit 50b clockwise to the maximum bending angle RA. Referring to FIG. 2C, rotating the articulation knob 210 counterclockwise from the initial position to the maximum rotation position moves the articulation link 232 a sixth distance toward the proximal end, and further moves the articulation transmission member 56 and the articulation drive shaft 572a toward the proximal end by L6 along the longitudinal axis C, bending the distal enforcement unit 50b counterclockwise to the maximum bending angle LA. Therefore, when the articulation transmission member 56 moves L5 or L6 along the longitudinal axis C, the angle between the distal enforcement unit 50b and the longitudinal axis C changes from 0° to the maximum bending angle RA or LA. That is, when the bending transmission member 56 moves from the farthest position to the near side by L5+L6 in the direction of the vertical axis C, the angle between the far-end execution part 50b and the vertical axis C changes from the maximum bending angle RA on one side to the maximum bending angle LA on the other side.

[0064] This shows that when the maximum travel distance of the bending transmission member is the same, the structure of the terminal enforcement assembly 30, 60 according to the present invention can provide a larger maximum bending angle than the structure of the terminal enforcement assembly 50 of the prior art.

[0065] In the distal executor assembly 30, 60 according to any embodiment of the present invention, when the angle between the distal executor 30b, 60b and the longitudinal axis C is 0°, the line connecting the axis of the curvature drive shaft 372a, 672a and the axis of the pivot shaft 371c, 671c forms an angle θ with the longitudinal axis C, and the magnitude of θ is one of the factors that determine the maximum curvature angle that the distal executor assembly 30, 60 can provide. Correspondingly, when the distal executor assembly 30, 60 is in the loading standby position, the curvature angle of the distal executor 30b, 60b is (90-θ)°. As can be seen, the smaller the θ value, the greater the maximum curvature angle that the distal executor assembly 30, 60 can provide, regardless of the mechanical interference of each component or the maximum stroke that the curvature drive assembly / curvature transmission assembly can provide. For example, in one specific embodiment, when the angle between the distal end execution part 30b, 60b and the longitudinal axis C is 0°, if the angle θ between the line connecting the axis of the bending drive shaft 372a, 672a and the pivot shaft 371c, 671c and the longitudinal axis C is 45°, the maximum bending angle of the distal end execution part 30b, 60b can reach approximately 90°.

[0066] When the distal enforcement portion 30b, 60b is in a state of a large bending angle relative to the proximal main body portion 30a, 60a, the striking member 35 bends accordingly, enabling a smooth striking operation. To achieve this, the distal enforcement assembly 30, 60 further includes a restricting passage that restricts the movement of the striking beam during striking of the striking member 35 when the distal enforcement portion 30b, 60b is in a bending state. The restricting passage is located in the interface between the proximal main body portion 30a, 60a and the joint assembly 30c, 60c, and the striking beam 351 of the striking member 35 is located within the restricting passage and moves along its extension direction. The restricting passage is formed by a first restricting portion and a second restricting portion located on both sides of the striking beam 351, respectively. The first restricting portion is aligned with the outer arc surface of the maximum bending of the striking beam 351, and the second restricting portion is aligned with the inner arc surface of the maximum bending of the striking beam 351.

[0067] 15A, in the terminal enforcement assembly 30 described in any embodiment of the present invention, the first limiting portion is a first limiting protrusion 36a provided on the curved transmission member 36, and the first limiting protrusion 36a has an inner concave arc surface that matches the outer arc surface of the maximum curvature of the embossing beam 351 (i.e., in FIG. 15A, the outer arc surface of the curved region of the embossing beam 351 when the embossing beam 351 reaches its maximum curvature angle). Specifically, the curved transmission member 36 is shaped like an elongated thin piece, and the first limiting protrusion 36a is formed in a partial region of the distal end of the curved transmission member 36 and protrudes toward the embossing member 35. The first limiting protrusion 36a forms an inner concave arc surface on the side facing the embossing beam 351, and the arc length of the inner concave arc surface covers the maximum deformation region of the embossing beam 351. The second limiting portion is a second limiting protrusion 372d provided on the joint assembly 30c, and the second limiting protrusion 372d has an outwardly convex arcuate surface that matches the maximum curvature inner arcuate surface of the projection beam 351 (i.e., the inner arcuate surface of the curved region of the projection beam 351 when the projection beam 351 reaches its maximum curvature angle). Specifically, the second connecting member 372 of the joint assembly 30c is provided with a second limiting protrusion 372d adjacent to the inner curved region of the projection beam 351, and the second limiting protrusion 372d has an outwardly convex arcuate surface region. A limiting passage that limits the curvature position of the projection beam 351 is formed between the curvature transmission member 36 and the second connecting member 372, and the projection beam 351 bends along the limiting passage to prevent the projection beam 351 from escaping from one side during movement at a large curvature angle. In this embodiment, the curved driving force received by the curved transmission member 36 is directed toward the distal end. When the curved transmission member 36 slides from the proximal end to the distal end under the action of the curved driving mechanism, the first limiting protrusion 36a of the curved transmission member 36 moves toward the distal end and reaches the area of ​​the joint assembly 30c, where it interlocks with the second limiting protrusion 372d on the joint assembly 30c to form a limiting passage with a bending angle of approximately 90 degrees.

[0068] In the distal enforcement assembly 60 according to any embodiment of the present invention, as shown in FIGS. 16A-C, the first limiting portion includes a limiting member 68 provided on the proximal main body portion 60a, which has an inner concave arc surface 68a that matches the maximum curvature of the outer arc surface of the embossed beam. Specifically, the proximal end of the limiting member 68 is fixedly connected to the inner tube of the proximal main body portion 60a, and the distal end is fitted to the connecting shaft 672b, with the side adjacent to the embossed beam forming an inner concave arc surface 68a. The arc length of the inner concave arc surface 68a covers the maximum deformation area of ​​the embossed beam. The second limiting portion is an outer convex arc surface 66b provided on the distal end of the curved transmission member 66, which matches the maximum curvature of the inner arc surface of the embossed beam.

[0069] As shown in FIG. 10, a receiving groove 351a is provided in the distal end region of the projection beam 351 of the projection member 35. When the bending angle of the distal execution portion 30b is less than a set value, referring to FIGS. 14A and 16A, a portion of the first limiting portion is received in the receiving groove 351a.

[0070] In the above-described embodiments of the present invention, when the distal executive portion 30 extends along the longitudinal axis C, the bending drive shafts 371a, 372a are located at the proximal or distal ends of the pivot shafts 371c, 372c, and the distal executive portion 30b is deflected in a unilateral direction away from the longitudinal axis C and is convertible between an extended position (i.e., a position where the angle between the distal executive portion 30b, 60b and the longitudinal axis C is 0° or nearly 0°), an intermediate bending angle position, and a maximum bending angle position, thereby achieving a semi-lateral large-angle bending of the distal executive assembly of the surgical anastomosis instrument. Furthermore, in the distal executive assembly 30, 60 described in any embodiment of the present invention, the articulation assembly 30c, 60c employs a single pivot axis to achieve bending, ensuring the smallest possible bending radius. In other words, the maximum bending angle that the distal executive assembly can provide is increased without increasing the bending radius of the distal executive assembly.

[0071] In any embodiment of the present invention, the distal enforcement assembly 30, 60 has a loading standby position where the longitudinal axis C forms a certain angle θ with the distal enforcement part 30b, 60b. Therefore, the present invention further provides an initial holding member for more reliably holding the distal enforcement assembly 30, 60 in the loading standby position. Specifically, as shown in Figures 18 to 20, this is a specific embodiment of the initial position holding member 40 provided by the present invention. The initial position holding member 40 has a support main body with a predetermined bending angle and holds the distal enforcement part 30b, 60b of the distal enforcement assembly 30, 60 in an initial bending state for loading standby. Specifically, the initial position holding member 40 is used to support the distal enforcement part 30b and the proximal main body part 30a of the distal enforcement assembly 30, and holds the distal enforcement part 30b in an initial bending state with a predetermined angle relative to the proximal main body part 30a. Specifically, the support main body includes a first holding arm 41 that matches with the proximal main body part 30a and a second holding arm 42 that matches with the distal execution part 30b, and further includes a support beam 43 connected between the first holding arm 41 and the second holding arm 42. Here, the first holding arm 41 and the second holding arm 42 are semi-open and formed in a semi-circular shape that matches the outer shapes of the proximal main body part 30a and the distal execution part 30b, and are held by both to prevent them from falling off.

[0072] More specifically, to facilitate the user's grip, the initial position-retaining member 40 further includes a gripping frame 44 suitable for the operator to grasp, which is connected to the outer wall of the support body. The structure of the gripping frame 44 is not unique; one possible form is a handle-type bracket suitable for hand passage, which penetrates the vertical side wall of the support body and extends to the outer region of the support body to form a hanging arm structure. More specifically, the inner wall of the second holding arm 42 of the initial position-retaining member 40 is provided with a limiting structure for engagement with the working portion 352 of the striking member 35. As shown in FIGS. 18 to 20 , the limiting structure is a protruding structure 45 formed on the inner wall of the second holding arm 42. The protruding structure 45 extends into the interior of the nail base 321 along the perforation and abuts against the working portion 352 of the striking member 35, preventing the striking member 35 from moving toward the distal end.

[0073] As can be appreciated, the distal executor assembly and initial position retention member described in any of the embodiments of the present invention are applicable to universal surgical anastomosis instruments, i.e., in which the entire distal executor assembly is removably attached to the elongated body assembly of the surgical instrument, such as surgical instrument 100 described in any of the embodiments of the present invention, and are also applicable to fixed surgical anastomosis instruments, i.e., in which the proximal main body portion of the distal executor assembly is non-removably fixed to the elongated body assembly of the surgical instrument and a portion of the nail set assembly is removably replaceable, such as surgical instrument 200 shown in FIG.

[0074] Obviously, the above examples are merely illustrative for the purpose of clarity and are not limiting of the embodiments. Those skilled in the art can make other different types of modifications or variations based on the above description. It is not necessary or possible to cover all the embodiments here. Therefore, any obvious modifications or variations derived therefrom still fall within the scope of protection of the present invention.

Claims

1. a distal executive assembly including a proximal main body portion for defining a longitudinal axis and a distal executive portion for manipulating tissue, said distal executive portion pivotally connected to said proximal main body portion via an articulation assembly, said articulation assembly defining a pivot axis; the proximal main body portion includes a curved transmission member, the articulation assembly is provided with a curved drive shaft, the curved transmission member is pivotally connected to the curved drive shaft, the curved transmission member is operable to reciprocate along a longitudinal axis, thereby pivoting the curved drive shaft about the pivot axis and pivoting the distal executive portion about the pivot axis; A distal enforcement assembly, wherein the distal enforcement portion forms a non-zero angle with respect to the longitudinal axis when the distal enforcement assembly is in a ready-to-load position.

2. 2. The distal enforcement assembly of claim 1, wherein when said distal enforcement section extends in the direction of said longitudinal axis, a line connecting the axes of said curved drive shaft and said pivot shaft forms a non-zero angle with said longitudinal axis.

3. 2. The distal enforcement assembly of claim 1, wherein the curved drive shaft is located at a proximal or distal end of the pivot shaft when the distal enforcement section extends along the longitudinal axis.

4. 2. The terminal execution assembly of claim 1, wherein when the terminal execution assembly is in the load waiting position, the articulation assembly pivots so that a line connecting the axis of the curved drive shaft and the axis of the pivot shaft is perpendicular to the longitudinal axis.

5. 2. The terminal enforcement assembly of claim 1, wherein the distal enforcement portion is pivoted about the pivot axis and gradually moves away from the longitudinal axis as the curved transmission member is operated to move from the starting position toward the end position.

6. 6. The distal enforcement assembly of claim 5, wherein the distal enforcement portion extends in the longitudinal axis direction when the curved transmission member is in the starting position.

7. 6. The terminal execution assembly according to claim 5, wherein when the terminal execution assembly is in the loading standby position, the curved transmission member is in an intermediate position in the course of movement from the starting position toward the end position.

8. 2. The distal execution assembly according to claim 1, further comprising a restricting passage for restricting a bending position of the ejection member during the ejection movement of the ejection member when the distal execution portion is in a bent state, the restricting passage being located in a mating region between the proximal main body portion and the joint assembly, and the ejection member being located inside the restricting passage and moving along its extension direction.

9. 9. The terminal enforcement assembly of claim 8, wherein the restrictive passage is defined by a first restricting portion and a second restricting portion located on opposite sides of the drive member.

10. 10. The terminal execution assembly of claim 9, wherein the first limiting portion includes a first limiting protrusion provided on the curved transmission member, the first limiting protrusion having an inner concave arc surface that matches the maximum curved outer arc surface of the drive member, and the second limiting portion includes a second limiting protrusion provided on the joint assembly, the second limiting protrusion having an outer convex arc surface that matches the maximum curved inner arc surface of the drive member.

11. 10. The terminal execution assembly of claim 9, wherein the first limiting portion includes a limiting member provided on the proximal main body portion, the limiting member having an inner concave arc surface that matches the maximum curvature outer arc surface of the thrust member, and the second limiting portion is an outer convex arc surface provided on the distal end of the curved transmission member, the outer convex arc surface that matches the maximum curvature inner arc surface of the thrust member.

12. The terminal execution assembly according to claim 10 or 11, wherein an accommodation groove is provided in the distal end region of the pushing member, and when the bending angle of the distal end execution portion is less than a set value, a portion of the first limiting portion is accommodated in the accommodation groove.

13. 2. The terminal execution assembly of claim 1, wherein the joint assembly includes a first connecting member and a second connecting member, the first connecting member and / or the second connecting member is provided with the pivot axis, and the first connecting member and the second connecting member are connected through two connecting shafts located on opposite sides of the pivot axis, one of which is a curved drive shaft suitable for mating with the curved transmission member.

14. The distal executor assembly of claim 1, further comprising an initial position maintaining member, the initial position maintaining member being used to support the distal executor portion and the proximal main body portion and to maintain the distal executor portion in an initial curved state having a set angle relative to the proximal main body portion.

15. The terminal execution assembly of claim 14, wherein the initial position maintaining member includes a support main body having a set bending angle, the support main body including a first holding arm that blends with the proximal main body portion and a second holding arm that blends with the distal execution portion, and further including a support beam connected between the first holding arm and the second holding arm.

16. The terminal execution assembly of claim 14, wherein the initial position retention member is provided with a limiting structure for mating with the ejection member, the limiting structure being suitable for mating with a working portion of the ejection member and limiting the position of the ejection member.

17. 2. The distal execution assembly of claim 1, wherein the distal execution section includes a nail lock assembly and a nail anvil assembly pivotally connected, and the distal ends of the nail lock assembly and the nail anvil assembly are provided with positioning structures that engage with each other, and the positioning structures are used to limit the widthwise positions of the nail lock assembly and the nail anvil assembly when the distal execution section is in a closed position.

18. 18. The terminal execution assembly of claim 17, wherein the positioning structure includes a positioning protrusion provided on one of the nail lock assembly and the nail anvil assembly, and a positioning recess provided on the other of the nail lock assembly and the nail anvil assembly.

19. a distal executive assembly including a proximal main body portion for defining a longitudinal axis and a distal executive portion for manipulating tissue, said distal executive portion pivotally connected to said proximal main body portion via an articulation assembly, said articulation assembly defining a pivot axis; Including a curved transmission member, The joint assembly is provided with a curved driving shaft, and the curved transmission member acts on the curved driving shaft to provide a curved driving force to the joint assembly, thereby bending the distal end executive part to one side relative to the longitudinal axis of the proximal end main body part; The distal execution section is deflectable in a unilateral direction away from the longitudinal axis and is convertible between an extended position, an intermediate bending angle position, and a maximum bending angle position, and when the distal execution section is in the intermediate bending angle position, the distal execution assembly is in a loading standby position.

20. A surgical instrument comprising a main body portion and a distal enforcement assembly selectively joined to the main body portion, said distal enforcement assembly being a distal enforcement assembly according to any preceding claim.

21. 1. A surgical instrument comprising: an elongate body assembly defining a longitudinal axis; and a distal executive portion for manipulating tissue, said distal executive portion pivotally connected to said body assembly via an articulation assembly, said articulation assembly being provided with a pivot shaft; a curved transmission member, the joint assembly is provided with a curved drive shaft, the curved transmission member acts on the curved drive shaft to provide a curved driving force to the joint assembly, and causes the distal end executive part to bend relative to the longitudinal axis of the proximal end main body part; A surgical instrument, wherein the curved drive shaft is located at the proximal or distal end of the pivot shaft when the distal execution portion extends in the longitudinal axis direction.

22. 1. A surgical instrument comprising: an elongate body assembly defining a longitudinal axis; and a distal executive portion for manipulating tissue, said distal executive portion pivotally connected to said body assembly via an articulation assembly, said articulation assembly being provided with a pivot shaft; a curved transmission member, the joint assembly is provided with a curved drive shaft, the curved transmission member acts on the curved drive shaft to provide a curved driving force to the joint assembly, and the distal end executive part is curved to one side relative to the longitudinal axis of the proximal end main body part; The distal executive section is deflectable in a unilateral direction away from the longitudinal axis and is convertible between an extended position, an intermediate bending angle position, and a maximum bending angle position, and when the distal executive section is in the intermediate bending angle position, the initial position of the distal executive assembly.

23. An initial position maintaining member comprising a support body having a set bending angle for maintaining a distal execution portion of a distal execution assembly of a surgical instrument in an initial bending state having a set angle relative to a longitudinal axis.

24. 24. The initial position maintaining member of a surgical instrument according to claim 23, wherein the supporting main body is used to mate with an end execution assembly of the surgical instrument and includes a first holding arm that mates with a proximal main body portion of the end execution assembly and a second holding arm that mates with a distal execution portion of the end execution assembly, and wherein the angle between the first holding arm and the second holding arm is an obtuse angle.

25. 24. The initial position maintaining member of a surgical instrument according to claim 23, wherein the supporting main body is used to mate with an end execution assembly and an elongated body assembly of the surgical instrument, and includes a first holding arm that mates with a proximal main body portion of the end execution assembly, and a second holding arm that mates with the elongated body assembly, and the angle between the first holding arm and the second holding arm is an obtuse angle.

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