Surgical instrument

Abstract

The utility model discloses a surgical instrument, and belongs to the field of medical instruments. Comprising an end execution assembly which comprises a percussion component used for cutting tissue; an elongated body assembly defining a longitudinal axis, including a firing bar for transmitting a driving force; the percussion component at least comprises a percussion beam and a percussion connecting piece connected to the near end of the percussion beam, and the far end of the percussion rod is directly matched with the near end of the percussion connecting piece in a rotating and buckling mode. According to the surgical instrument, the connection reliability of the end executing assembly and the slender body assembly can be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to surgical instrument field, especially a kind of clamping, cutting and anastomosis surgical instrument. BACKGROUND

[0002] Linear clamping, cutting and anastomosis surgical instrument can be used in surgical operation to resect tissue, which generally includes a handle assembly, an elongated body and an end effector. The end effector includes a clamping assembly for clamping tissue and a firing member for cutting tissue, which is driven by a drive mechanism arranged on the side of the handle assembly and a transmission member (such as a firing rod) arranged in the handle assembly and the elongated body. When the firing member is driven to move from the proximal end to the distal end, the end effector can perform surgical operations such as cutting and anastomosis. After the end effector performs the above-mentioned surgical operation, the drive mechanism drives the transmission mechanism and the firing member to move distally until the initial position, at which time the clamping assembly can release the clamped tissue.

[0003] Currently, the connection structure of the firing rod in the elongated body assembly of some surgical instruments and the firing member in the end effector is unreasonable, which causes the anastomosis device to encounter greater resistance when the firing rod drives the firing member to reset during use, and the two may separate, causing the firing rod in the elongated body assembly to be unable to pull the firing member in the end effector back to the initial position. At this time, the jaws cannot be opened to release the clamped tissue, resulting in low reliability of the instrument. SUMMARY

[0004] Therefore, the utility model provides a kind of clamping, cutting and anastomosis surgical instrument with higher safety.

[0005] In view of the above technical problems, the utility model provides the following technical scheme:

[0006] A surgical instrument includes an end effector assembly including a firing member for cutting tissue, an elongated body assembly defining a longitudinal axis, and a firing rod for transmitting driving force. The firing member includes a firing beam and a firing connector connected to the proximal end of the firing beam. The distal end of the firing rod is directly rotationally snap-fitted with the proximal end of the firing connector.

[0007] In some embodiments of the utility model, the firing connector has a plug-in hole extending along the longitudinal axis direction, and a first limiting portion is arranged on the inner wall of the plug-in hole near the proximal end. The distal end of the firing rod is circumferentially provided with a limiting boss. When the firing rod is rotationally plugged into the plug-in hole of the firing connector, the first limiting portion cooperates with the limiting boss to limit the proximal position of the firing rod.

[0008] In some embodiments of the utility model, the first limiting part is configured as a limiting protrusion formed on the inner wall of the plug-in hole, and the limiting protrusion extends to the proximal end face of the firing connecting piece.

[0009] In some embodiments of the utility model, the plug-in hole is provided with a second limiting part, the second limiting part is located at the distal side of the first limiting part, and the second limiting part cooperates with the distal end face of the firing rod to limit the distal position of the firing rod.

[0010] In some embodiments of the utility model, the second limiting part is configured as an annular wall formed on the inner wall of the plug-in hole, and the proximal end face of the annular wall cooperates with the distal end face of the firing rod.

[0011] In some embodiments of the utility model, the firing beam is configured as a sheet-shaped beam body with an opening at the proximal end, and the firing connecting piece is plug-in connected in the opening of the firing beam.

[0012] In some embodiments of the utility model, the proximal end of the firing beam comprises a first beam arm and a second beam arm oppositely arranged to form the opening, the firing connecting piece comprises a first surface and a second surface arranged in parallel and oppositely, the first beam arm is plug-in on the first surface, and the second beam arm is plug-in on the second surface.

[0013] In some embodiments of the utility model, at least one plug-in recess is formed on the first surface and the second surface of the firing connecting piece respectively, and at least one plug-in protrusion is correspondingly formed on the first beam arm and the second beam arm, and the plug-in protrusion cooperates with the plug-in recess.

[0014] In some embodiments of the utility model, the plug-in recess comprises a proximal recess and a distal plug-in hole, the proximal side of the proximal recess extends to the proximal side of the firing connecting piece, and the proximal face of the distal plug-in hole is the distal end face of the annular wall.

[0015] In some embodiments of the utility model, the first surface and the second surface of the firing connecting piece are formed with the proximal recess in the region where the first limiting part is located.

[0016] In some embodiments of the utility model, the firing member further comprises a working part arranged at the distal end of the firing beam, and the working part is configured as an I-beam structure.

[0017] In some embodiments of the utility model, the end part execution assembly comprises a proximal main part and a distal execution part, the proximal main part and the distal execution part are pivotally connected through a joint assembly, and a channel for slidably receiving the firing member is arranged on the proximal main part.

[0018] The technical scheme of the utility model has the following technical effects relative to the prior art:

[0019] The surgical instrument provided by the utility model, when the end execution assembly is connected to the slender body assembly, the proximal end of the firing connecting piece in the firing member directly rotates and buckles with the distal end of the firing rod to realize reliable connection of the two parts, avoid the problem that the proximal end of the firing beam capable of being elastically deformed in the prior art is matched with the distal end of the firing rod, and the two parts have a separation risk when the firing rod drives the firing member to reset and meets a large resistance. BRIEF DESCRIPTION OF DRAWINGS

[0020] The preferred embodiments in the utility model will be described in detail below with reference to the drawings, which will help to understand the purpose and advantages of the utility model, wherein:

[0021] Figure 1 It is a structural schematic view of a specific embodiment of the surgical instrument of the utility model;

[0022] Figure 2 It is an explosion view of a specific embodiment of the end execution assembly in the surgical instrument of the utility model;

[0023] Figure 3 It is a structural schematic view of a specific embodiment of the firing member in the surgical instrument of the utility model;

[0024] Figure 4 It is a connection relationship diagram of the firing member and the firing rod in a specific embodiment of the surgical instrument of the utility model;

[0025] Figure 5 It is an explosion view of the connection relationship of the firing member and the firing rod in a specific embodiment of the surgical instrument of the utility model;

[0026] Figure 6 It is a sectional view of the firing member and the firing rod in a specific embodiment of the surgical instrument of the utility model in a connected state;

[0027] Figure 7 It is a sectional view of the firing connecting piece and the firing rod in a specific embodiment of the surgical instrument of the utility model in a connected state;

[0028] Figure 8 It is a structural schematic view of the firing connecting piece in a specific embodiment of the surgical instrument of the utility model;

[0029] Figure 9 It is a side view of the firing connecting piece in a specific embodiment of the surgical instrument of the utility model;

[0030] Figure 10 It is Figure 9 A-A sectional view. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0032] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0035] In various embodiments of the present application, "distal end / side" refers to the end of the surgical instrument that is far away from the operator when the surgical instrument is operated, and "proximal end / side" refers to the end / side of the surgical instrument that is close to the operator when the surgical instrument is operated.

[0036] The following is a specific embodiment of a surgical instrument. Generally speaking, the embodiments of the surgical instrument described herein are endoscopic surgical cutting anastomosis instruments. However, it should be pointed out that the surgical instrument can also be a non-endoscopic surgical cutting anastomosis instrument, such as an open surgical instrument for open surgery.

[0037] In various embodiments of the present application, "distal end / side" refers to the end of the surgical instrument that is far away from the operator when the surgical instrument is operated, and "proximal end / side" refers to the end / side of the surgical instrument that is close to the operator when the surgical instrument is operated.

[0038] 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.

[0039] Specifically, Figure 1 The surgical instrument 100 shown includes a handle assembly 10, an elongated body assembly 20, and an end effector assembly 30, arranged from proximal to distal. The handle assembly 10 is adapted for operator manipulation of the surgical instrument. The handle assembly 10 controls the movement of the end effector assembly 30 via the elongated body assembly 20 to perform surgical operations, such as tissue clamping / closing, suturing / anastomosis, and cutting. The handle assembly 10 includes a handle body 12 that can be held by a user in a conventional manner. In one embodiment, the surgical instrument operates the end effector assembly 30 to close and fire via a button 11; in another embodiment, the surgical instrument can also operate the end effector assembly 30 to close and fire via a push knob or trigger on the handle, enabling the end effector assembly 30 to perform cutting and suturing operations. The elongated body assembly 20 is an elongated tubular structure that transmits the driving force of the handle to the end effector assembly 30 located at the distal end of the surgical instrument.

[0040] like Figure 1 As shown, the end effector 30 is used to manipulate tissue to perform specific surgical operations, such as clamping, suturing / anastomosis, and cutting. The end effector 30 includes a proximal body portion 30a and a distal effector portion 30b, which are pivotally connected via a joint assembly 38. The proximal body portion 30a of the end effector 30 is detachably connected to the distal end of the elongated body assembly 20.

[0041] like Figure 1 , Figure 2 As shown, the distal actuator 30b includes a cartridge assembly 31 and an anvil assembly 32, which are movable relative to each other to close the jaws and grip tissue. In one specific embodiment, the anvil assembly 32 is operably pivoted toward the cartridge assembly 31 until it closes the jaws of the distal actuator 30 to grip tissue; the anvil assembly 32 is also pivoted toward a direction away from the cartridge assembly 31 until it opens the jaws of the distal actuator 30 to release tissue. Alternatively, the cartridge assembly 31 of the distal actuator 30 may be operably pivoted toward the anvil assembly 32 until it closes the jaws of the distal actuator 30 to grip tissue; and the cartridge assembly 31 may be operably pivoted toward a direction away from the cartridge assembly 31 until it opens the jaws of the distal actuator 30 to release tissue.

[0042] likeFigure 2 As shown, the staple cartridge assembly 31 includes a staple cartridge 312, a staple cartridge base 311, and a pusher slider 313 disposed in the cavity between the staple cartridge 312 and the staple cartridge base 311. The staple cartridge 312, as a disposable component, is detachably connected to the staple cartridge base 311. In other optional embodiments, the staple cartridge base 311 in the staple cartridge assembly 31 is fixedly connected to the staple cartridge 312 or the two are integrally formed, and is detachably connected to the elongated body assembly 20 as a single component. The staple cartridge base 311 is formed as an open shell structure with a U-shaped or semi-circular cross-section, connected to the distal end of the elongated body assembly 20, and the staple cartridge 312 is inserted into the staple cartridge base 311 by means of locking or other methods. The staple cartridge 312 is shaped as an elongated base, with one side away from the staple cartridge base 311 designed to engage with tissue. This tissue-engaging side (also called the staple ejection surface) has a cutting groove extending from the proximal to the distal end of the staple cartridge 312. This cutting groove is adapted for the passage of a cutting blade to cut the tissue held between the contact surface and the anvil assembly 32 along the proximal to distal end of the staple cartridge 312. In an optional embodiment, the cutting groove is located at the center of the upper surface of the staple cartridge 312, dividing the staple cartridge 312 into two staple ejection zones. The staple ejection area is provided with several rows of staple holes, which are arranged along the longitudinal axis C. The staple holes can be used to accommodate suture staples 314 and staple drivers 315. The staple drivers 315 are installed on the side of the staple ejection surface facing the staple cartridge 312. The staple pusher slider 313 slides along the staple cartridge base 311 to push the staple driver 315 to move in a direction perpendicular to the longitudinal axis C, thereby implanting the suture staples 314 into the tissue to achieve suturing.

[0043] The anvil assembly 32 includes an anvil shell and an anvil seat located inside the anvil shell. The anvil seat cooperates with the staple cartridge 312 to realize the bending operation of the suture staples 314. The surface of the anvil seat is provided with a plurality of staple buds. The staple buds correspond one-to-one with the staple exit holes on the staple cartridge 312. During tissue anastomosis, the suture staples 314 in the staple exit holes abut against the staple buds.

[0044] Specifically, such as Figure 2As shown, the proximal body portion 30a includes an elongated outer tube 33, a support body 34 disposed within the outer tube 33, a slidable firing member 35 disposed within the support body 34, and a bending member 36; wherein, the outer tube 33 extends in the same direction as the tubular outer shell of the elongated body assembly 20; the support body 34 includes a first half-support body 34a and a second half-support body 34b, and a channel for slidably receiving the firing member 35 is defined between the first half-support body 34a and the second half-support body 34b. The proximal end of the first half-support body 34a includes a joint portion 34c for connection with the elongated body assembly 20, and the joint portion 34c is provided with a engagement lug for releasably engaging the elongated body assembly 20 by a rotational snap-fit ​​connection.

[0045] like Figure 3 As shown, the firing member 35 includes an elongated firing beam 351, a working section 352 at the distal end, and a firing connector 353 at the proximal end. The working section 352 of the firing member 35 is shaped like an I-beam, a portion of which abuts against the pusher slider 313 and can slide integrally toward the distal end of the staple cartridge assembly 31 to perform corresponding surgical operations. For example, when the firing member 35 is driven to move from the proximal end to the distal end, a portion of the working section 352 of the firing member 35 moves distally along with the pusher slider 313. The pusher slider 313 acts on the staple driver 315 to eject the suture staple 314 from the staple cartridge assembly 31, achieving tissue anastomosis. Figure 3 As shown, the working section 352 includes an upper flange 352a, a lower flange 352b, and a vertical support rod 352c connecting the upper flange 352a and the lower flange 352b to each other. A cutting tool 352d is supported on the vertical support rod 352c of the working section 352 or is a cutting edge formed in the vertical support rod 352c of the working section 352. The upper flange 352a is slidably accommodated within the channel of the anvil assembly 32, and the lower flange 352b is slidably disposed within the channel of the staple cartridge assembly 31. As the working section 352 is operated to move distally within the distal actuator 30b, the continued advance of the firing member 35 gradually maintains a minimum tissue gap adjacent to the working section 352. Simultaneously, the cutting tool 352d on the working section 352 cuts the tissue.

[0046] The firing connector 353 engages with the distal end of the firing rod 22 of the elongated body assembly 20 to achieve a rotatable snap-fit ​​connection, thereby transmitting the firing driving force. Figure 8 As shown, the firing beam 351 can be made of a single piece of material or of multiple stacked sheets. The firing connector 353 located at the proximal end of the firing beam 351 is formed as a sleeve structure with an opening. The firing connector 353 is inserted into the opening of the firing beam 351. The proximal end of the firing connector 353 is provided with a insertion hole 353a, which is configured to receive the distal end of the firing rod 22 when the proximal end of the end actuation assembly 30 engages with the elongated body assembly 20.

[0047] Specifically, such as Figure 4 , Figure 5 and Figure 8 As shown, the proximal end of the firing beam 351 includes a first beam arm 3511 and a second beam arm 3512 disposed opposite to each other to form the opening. The firing connector 353 includes a first surface 3531 and a second surface 3532 disposed parallel to each other. The first beam arm 3511 is inserted into the first surface 3531, and the second beam arm 3512 is inserted into the second surface 3532.

[0048] More specifically, at least one insertion recess is formed on the first surface 3531 and the second surface 3532 of the firing connector 353, and at least one insertion protrusion is formed on the first beam arm 3511 and the second beam arm 3512 respectively. The insertion protrusion and the insertion recess cooperate to realize the insertion and engagement of the firing connector 353 and the firing beam 351.

[0049] like Figure 8 As shown, the insertion recess includes a proximal groove 353b and a distal insertion hole 353c. The proximal side of the proximal groove 353b extends to the proximal side of the firing connector 353, and the distal side extends to the notch of the firing connector 353. The proximal groove 353b limits the firing beam 351 along its thickness direction. The distal insertion hole 353c communicates with the insertion hole 353a of the firing connector 353 extending along its longitudinal axis. The proximal and distal sides of the distal insertion hole 353c each have limiting surfaces to limit the firing beam 351 along its longitudinal axis. By providing two or more insertion mating structures between the connector 353 and the firing beam 351, the connection strength and reliability of both can be improved, while also dispersing the transmission force.

[0050] like Figure 7 As shown, the distal end of the firing lever 22 is directly rotated and snapped into place with the proximal end of the firing connector 353 to avoid the risk of the firing lever 22 separating from the firing beam 351 when the firing lever 22 engages with the firing beam 351, which is capable of undergoing a certain degree of elastic deformation, and the firing lever 22 drives the firing component 35 to reset and encounters significant resistance.

[0051] In one specific implementation, such as Figure 7 , Figure 8As shown, the proximal end of the insertion hole 353a of the firing connector 353 is provided with a first limiting part 353d; the distal end of the firing rod 22 is provided with a limiting boss 22a along the circumferential direction. When the end actuation component 30 is connected to the elongated body component 20, the limiting boss 22a of the firing rod 22 enters the insertion hole 353a along the area where the first limiting part 353d is not provided in the insertion hole 353a of the firing connector 353. After rotating by a set angle, the distal end face of the first limiting part 353d abuts against the proximal end face of the limiting boss 22a to restrict the proximal position of the firing rod 22. In this state, the firing rod 22 can drive the firing component 35 to move proximally.

[0052] Specifically, the first limiting portion 353d is constructed as a limiting protrusion formed on the inner wall of the insertion hole 353a. The limiting protrusion extends along the longitudinal axis, with its proximal end extending to the proximal end face of the firing connector 353. To make the rotational snap-fit ​​between the firing rod 22 and the firing connector 353 more stable, two or more limiting protrusions are symmetrically arranged in the circumferential direction in the insertion hole 353a. For example, in an optional embodiment, such as... Figure 7 , Figure 8- Figure 10 As shown, the two limiting protrusions are respectively formed on the regions of the insertion hole 353a located inside the first surface 3531 and the second surface 3532.

[0053] like Figure 7 , Figure 10 As shown, the firing connector 353 has a second limiting portion 353e within its insertion hole 353a. The second limiting portion 353e is located distal to the first limiting portion 353d, and it abuts against the distal end face of the firing rod 22 to restrict the distal position of the firing rod 22. In this state, the firing rod 22 can drive the firing member 35 to move distally. More specifically, the second limiting portion 353e is constructed as an annular wall formed on the inner wall of the insertion hole 353a, with the proximal end face of the annular wall engaging with the distal end face of the firing rod 22. In an optional embodiment, as... Figure 10 As shown, the distal end face of the annular wall forms the proximal side face of the distal insertion hole 353c.

[0054] In one alternative implementation, such as Figure 8 , Figure 9 As shown, the first surface 3531 and the second surface 3532 of the firing connector 353 are formed with the proximal groove 353b in the area where the first limiting portion 353d is located.

[0055] When the end effector 30 is mounted on the elongated body assembly 20 and controlled to fire, the firing rod 22 is controlled to move distally until its distal end abuts against the annular wall of the firing connector 353. The force is transmitted to the firing beam 351 through the firing member 353, and the transmission force is dispersed through the cooperation of multiple insertion protrusions on the firing beam 351 and insertion recesses on the firing connector 353. After firing, when the firing rod 22 is controlled to move proximally, the limiting protrusion 22a of the firing rod 22 directly acts on the first limiting part 353d of the firing connector 353. The transmission force is dispersed through the cooperation of multiple insertion protrusions on the firing beam 351 and insertion recesses on the firing connector 353, thereby improving the connection strength between the two and preventing separation when the two are subjected to large resistance during transmission.

[0056] In one optional embodiment, the first beam arm 3511 has at least two insertion protrusions, including a proximal insertion protrusion 3511a and a distal insertion protrusion 3511b; the second beam arm 3512 has at least two insertion protrusions, including a proximal insertion protrusion 3512a and a distal insertion protrusion 3512b. The proximal insertion protrusions 3511a / 3512a engage with the distal groove 353b on the firing connector 353. Figure 6 As shown, when the end actuation component 30 is connected to the elongated body component 20, the limiting boss 22a of the firing rod 22 enters the insertion hole 353a of the firing connector 353 in the area where the first limiting part 353d is not provided. After rotating by a set angle, the distal end face of the first limiting part 353d and the proximal insertion protrusions 3511a / 3512a abuts against the proximal end face of the limiting boss 22a to restrict the proximal position of the firing rod 22. In this state, the firing rod 22 can drive the firing component 35 to move proximally.

[0057] When the end effector 30 is mounted on the elongated body assembly 20 and controlled to fire, the firing rod 22 is controlled to move distally until its distal end abuts against the annular wall of the firing connector 353. The force is transmitted to the firing beam 351 through the firing member 353, and the transmission force is dispersed through the cooperation of multiple insertion protrusions on the firing beam 351 and insertion recesses on the firing connector 353. After firing, when the firing rod 22 is controlled to move proximally, the limiting boss 22a of the firing rod 22 directly acts on the first limiting part 353d of the firing connector 353 and the proximal insertion protrusions 3511a / 3512a. The transmission force is dispersed through the cooperation of multiple insertion protrusions on the firing beam 351 and insertion recesses on the firing connector 353, thereby improving the connection strength between the two and preventing separation when the two are subjected to large resistance during transmission. Meanwhile, damage to either the first limiting part 353d or the proximal insertion protrusions 3511a / 3512a will not affect the connection between the two. That is, when the two are subjected to greater resistance during transmission, the first limiting part 353d and the proximal insertion protrusions 3511a / 3512a at the connection point are subjected to force simultaneously, avoiding damage and ensuring the connection between the firing rod 22 and the firing component 35.

[0058] Reference Figure 2 As shown, the joint assembly 38 includes proximal connectors 381a and 381b fixedly connected to the distal end of the proximal main body 30a, and distal connectors 382a and 382b fixedly connected to the distal actuator 30b. Specifically, two proximal connectors 381a and 381b are provided, namely an upper proximal connector 381a and a lower proximal connector 381b, and two distal connectors 382a and 382b are also provided, namely an upper distal connector 382a and a lower distal connector 382b. In this embodiment, the upper proximal connector 381a extends distally from the distal end of the first semi-support body 34a and is fixedly connected by means such as a slot and a snap-fit ​​protrusion. Similarly, the lower proximal connector 381ab extends distally from the distal end of the second semi-support body 34b, and the lower proximal connector 381b is fixedly connected to the second semi-support body 34b by means of a slot and a snap-fit ​​protrusion. The upper distal connector 382a is connected to the staple cartridge assembly 31, and the lower distal connector 382b is connected to the anvil assembly 32. By providing two sets of proximal connectors 381a and 381b and two sets of distal connectors 382a and 382b, the bending stability of the distal actuator 30b can be further improved. Figure 4As shown, the distal ends of the proximal connectors 381a and 381b and the proximal ends of the distal connectors 382a and 382b have a toothed structure that meshes with each other. The meshing position of the two forms the pivot point of the distal actuator 30b, which can swing relative to the proximal main body 30a around the pivot axis. The distal connectors 382a and 382b are provided with at least one drive bending part 383 connected to the bending member 36. When the bending member 36 slides relative to the supporting body 34, it can directly or indirectly act on the drive bending part 383 of the distal connector 382a, so that the distal connector 382a can swing around the meshing position of the proximal connectors 381a and 381b and the distal connectors 382a and 382b under the action of the meshing teeth, thereby realizing the bending of the distal actuator 30b relative to the proximal main body 30a.

[0059] To ensure the stability of the firing member 35 as it moves distally after the distal actuator 30b bends relative to the proximal main body 30a, such as... Figure 2 As shown, the joint assembly 38 further includes a retainer 384 for accommodating the bending position of the firing member 35. The retainer 384 has a retaining channel adapted to accommodate at least a portion of the firing beam 351 of the firing member 35, allowing it to pass through the retaining channel and be movable along its extension direction. The retaining channel of the retainer 384 is constructed as an arcuate structure, with one side support wall engaging with the outer arcuate surface of the firing beam 351 at maximum bending, and the other side support wall adapted to engage with the inner arcuate surface of the firing beam 351 at maximum bending. The retainer 384 is connected to mutually engaging proximal connectors 381a and 381b and distal connectors 382a and 382b via two pivot axes, enabling it to pivot relative to the proximal connectors 381a and 381b with the distal connectors 382a and 382b about the pivot axes. The joint assembly 38 further includes a first connecting piece 385 and a second connecting piece 386. The first connecting piece 385 has two connecting holes, and the ends of the proximal and distal pivots of the retainer 384 are riveted to the connecting holes of the first connecting piece 385. The lower proximal connector 381b and the lower distal connector 382b are respectively riveted to the second connecting piece 386 via pivots. The second connecting piece 386 has two connecting holes, and the ends of the pivots on the lower proximal connector 381b and the lower distal connector 382b are riveted to the connecting holes of the second connecting piece 386.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this utility model.

Claims

1. A surgical instrument, comprising: An end effector assembly, comprising a firing member for cutting tissue; An elongated body assembly defining a longitudinal axis, comprising a firing lever for transmitting driving force; characterized in that, The firing component includes a firing beam and a firing connector connected to the proximal end of the firing beam, wherein the distal end of the firing rod is directly rotatably engaged with the proximal end of the firing connector.

2. The surgical instrument according to claim 1, characterized in that, The firing connector has a insertion hole extending along the longitudinal axis, and a first limiting part is provided on the inner wall of the insertion hole near its proximal end; the distal end of the firing rod is provided with a limiting boss along the circumferential direction. When the firing rod is rotatably inserted into the insertion hole of the firing connector, the first limiting part cooperates with the limiting boss to restrict the proximal position of the firing rod.

3. The surgical instrument according to claim 2, characterized in that, The first limiting part is constructed as a limiting protrusion formed on the inner wall of the insertion hole, and the limiting protrusion extends to the proximal end face of the firing connector.

4. The surgical instrument according to claim 2, characterized in that, The insertion hole is provided with a second limiting part, which is located far from the first limiting part. The second limiting part cooperates with the far end face of the firing rod to limit the far position of the firing rod.

5. The surgical instrument according to claim 4, characterized in that, The second limiting part is constructed as an annular wall formed on the inner wall of the insertion hole, and the proximal end face of the annular wall mates with the distal end face of the firing rod.

6. The surgical instrument according to claim 5, characterized in that, The firing beam is a sheet-like beam with an opening at its near end, and the firing connector is inserted into the opening of the firing beam.

7. The surgical instrument according to claim 6, characterized in that, The proximal end of the firing beam includes a first beam arm and a second beam arm disposed opposite to form the opening, and the firing connector includes a first surface and a second surface disposed parallel to each other and opposite to each other, the first beam arm being inserted into the first surface and the second beam arm being inserted into the second surface.

8. The surgical instrument according to claim 7, characterized in that, At least one insertion recess is formed on the first surface and the second surface of the firing connector, and at least one insertion protrusion is formed on the first beam arm and the second beam arm respectively, and the insertion protrusion and the insertion recess are engaged.

9. The surgical instrument according to claim 8, characterized in that, The insertion recess includes a proximal groove and a distal insertion hole. The proximal side of the proximal groove extends to the proximal side of the firing connector, and the proximal side of the distal insertion hole is the distal end face of the annular wall.

10. The surgical instrument according to claim 9, characterized in that, The first and second surfaces of the firing connector are formed with the proximal groove in the area where the first limiting portion is located.

11. The surgical instrument according to claim 1, characterized in that, The firing component also includes a working part disposed at the far end of the firing beam, the working part being constructed as an I-beam structure.

12. The surgical instrument according to claim 1, characterized in that, The end effector assembly includes a proximal body and a distal effector, the proximal body and the distal effector being pivotally connected via a joint assembly, and the proximal body having a channel for slidably receiving the firing member.

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