CN219147689U

CN219147689U - Surgical instrument and loading unit thereof

Info

Publication number: CN219147689U
Application number: CN202221779291.5U
Authority: CN
Inventors: 李可; 杨超; 柴明; 王再旺
Original assignee: Reach Surgical Inc
Current assignee: Reach Surgical Inc
Priority date: 2022-07-08
Filing date: 2022-07-08
Publication date: 2023-06-09
Anticipated expiration: 2032-07-08

Abstract

The utility model discloses a surgical instrument and a loading unit thereof, and belongs to the field of medical instruments. The loading unit of the surgical instrument includes a frame housing a slidable firing member; the safety mechanism comprises a locking piece connected to the firing component and a second locking part positioned on the frame; when the loading unit is in an initial unloaded state, the locking piece applies biasing force to the frame and is matched with the second locking part to lock the movement of the firing member; when the loading unit is engaged with the elongate body, the lockout is transitioned to a stored-force state and disengaged from the second lockout allowing movement of the firing member. The utility model can lock the firing component in the unloaded state, and avoid the problem that the cutting knife is ejected out by the firing rod in advance in the loading process.

Description

Surgical instrument and loading unit thereof

Technical Field

The present utility model relates to the field of surgical instruments, and in particular to a surgical instrument for clamping, cutting and stapling.

Background

Linear clamping, cutting and stapling surgical instruments may be used in surgical procedures to resect tissue. The surgical instrument includes a stapler body portion, and a disposable loading unit (SULU, single Use Loading Unit) for use with the stapler body portion, the disposable loading unit being for use by a single patient, capable of stapling while cutting tissue, the loading unit being removably mounted to a distal end of a barrel of the stapler, the stapler body portion providing a driving force for the loading unit to perform a surgical action. The loading unit includes a pair of grasping members that grasp tissue to be stapled. The loading unit also comprises a firing component for cutting tissues, which is driven by a driving mechanism arranged at the side of the handle assembly and a transmission mechanism arranged in the handle assembly and the slender body; when the electric firing mechanism is used, a user can control the driving mechanism to start to enable the firing member to move so as to cut tissues by triggering the firing button on the handle assembly.

In conventional anastomotic surgical instruments, the disposable loading unit is required to be loaded onto the main body portion of the stapler prior to surgery. In the loading process, the situation that the cutting knife is ejected out in advance by the firing bar to move to the far end easily occurs. Once the cutting knife is ejected in advance, the stapler nail box can not be opened, additional clinical intervention is needed, and potential safety hazards are caused.

Disclosure of Invention

To this end, the present utility model proposes a loading unit for a surgical instrument and a surgical instrument that can prevent the cutter from being ejected by the firing bar in advance during loading.

Aiming at the technical problems, the utility model provides the following technical scheme:

a loading unit of a surgical instrument includes a frame housing a slidable firing member; the safety mechanism comprises a locking piece connected to the firing member and a second locking part positioned on the frame, and the locking piece is a biasing member; when the loading unit is in an initial unloaded state, the locking piece is matched with the second locking part to lock the movement of the firing component; when the loading unit is engaged with the elongate body, the lockout is transitioned to a stored-force state and disengaged from the second lockout allowing movement of the firing member.

In some embodiments of the present utility model, the second locking portion is a second locking groove provided on the frame, and when the loading unit is in an initial unloaded state, the locking member is in a stretched state and is clamped in the second locking groove; the locking member is in a retracted state and exits the second locking groove when the loading unit is engaged with the elongate body.

In some embodiments of the utility model, the firing member includes a connector at a proximal end thereof for receiving a firing bar within the elongate body when the loading unit is engaged with the elongate body.

In some embodiments of the utility model, the locking member includes a body portion coupled to the proximal end of the connector and a locking end portion for mating with a second locking portion on the frame.

In some embodiments of the present utility model, a notch groove is formed at a proximal end of the connecting member, a main body of the locking member is inserted into the notch groove, and a locking end of the locking member extends out of a peripheral surface of the connecting member.

In some embodiments of the utility model, the proximal portion of the body portion is adapted to cooperate with a second trigger portion of the elongate body to effect a circumferential stop, and the locking member is rotated a set angle relative to the frame when the loading unit is engaged with the elongate body.

In some embodiments of the utility model, the proximal region of the frame is provided with an engagement portion which is coupled to the elongate body by means of a rotational snap-fit.

In some embodiments of the present utility model, a portion of the main body portion for engaging with the second trigger portion is located outside the connector.

In some embodiments of the present utility model, the locking member is formed as a Z-shaped elastic piece, two second locking portions are disposed on the frame corresponding to the Z-shaped elastic piece, the Z-shaped elastic piece is embedded on a proximal end portion of the connecting member, and two end portions of the Z-shaped elastic piece are respectively matched with the two second locking portions.

In some embodiments of the present utility model, the Z-shaped elastic piece includes a first support arm, a second support arm, and a connecting support arm therebetween, where the first support arm and the second support arm are disposed in parallel.

In some embodiments of the present utility model, ends of the first arm and the second arm of the Z-shaped elastic piece have arc bends.

In some embodiments of the utility model, the first arm and the connecting arm and the second arm and the connecting arm have angles from large to small when the loading unit is switched from the unloaded state to the engaged state with the elongated body.

A surgical instrument comprising an elongate body and a loading unit as described above, the locking member cooperating with a second trigger portion of the elongate body to effect a circumferential limit when the loading unit is engaged to the elongate body.

In some embodiments of the present utility model, the second trigger portion of the elongated body is an open slot formed at a distal end of the firing bar, and when the loading unit is engaged with the elongated body, a partial area of the locking member is inserted into the open slot.

Compared with the prior art, the technical scheme of the utility model has the following technical effects:

the surgical instrument and the loading unit thereof provided by the utility model comprise the locking piece connected to the firing member and the second locking part positioned on the frame to form a safety mechanism, so that when the loading unit is in an initial unloaded state, the locking piece applies biasing force to the frame and cooperates with the second locking part to lock the movement of the firing member, so that the firing member is prevented from moving relative to the frame in the transportation or assembly process, and further the firing cutter is prevented from being ejected out in advance by the firing rod to move towards the far end; when the loading unit is engaged with the elongated body, the locking member is converted into a force storage state and releases the engagement with the second locking portion, so that the firing member is unlocked, and the loading unit can be operated to perform normal firing actions.

Drawings

The objects and advantages of the present utility model will be better understood by describing in detail preferred embodiments thereof with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of one embodiment of a surgical instrument of the present utility model;

FIG. 2 is a schematic view of the structure of the elongate body and handle assembly of the surgical instrument of the present utility model;

FIG. 3 is an exploded view of a loading unit in the surgical instrument of the present utility model;

FIG. 4 is a schematic illustration of the attachment of the loading unit to the elongate body of the surgical instrument of the present utility model;

FIG. 5 is a schematic view of the structure of one embodiment of a safety mechanism in a surgical instrument of the present utility model;

FIG. 6 is a cross-sectional view of one embodiment of the surgical instrument of the present utility model in an unloaded state of the loading unit;

FIG. 7 is a cross-sectional view of one embodiment of the surgical instrument of the present utility model with the loading unit engaged with the elongated body;

FIG. 8 is a schematic view of one embodiment of a locking member and a first biasing member of the surgical instrument of the present utility model;

FIG. 9 is a schematic structural view of one embodiment of an unlock trigger in a surgical instrument of the present utility model;

FIG. 10 is a schematic view of a configuration of one embodiment of a firing beam in a surgical instrument of the present utility model;

FIG. 11 is a schematic structural view of another embodiment of a safety mechanism in a surgical instrument of the present utility model;

FIG. 12 is a cross-sectional view of one embodiment of the surgical instrument of the present utility model in an unloaded state of the loading unit;

FIG. 13 is a cross-sectional view of one embodiment of the surgical instrument of the present utility model with the loading unit engaged with the elongated body;

FIG. 14 is a schematic view of another embodiment of an unlock trigger in a surgical instrument of the present utility model;

FIG. 15 is a schematic view of another embodiment of a locking element of the surgical instrument of the present utility model;

FIG. 16 is a schematic view of another embodiment of a safety mechanism in a surgical instrument of the present utility model;

FIG. 17 is a cross-sectional view of an embodiment of the surgical instrument of the present utility model in an unloaded state of the loading unit;

FIG. 18 is a cross-sectional view of one embodiment of the surgical instrument of the present utility model with the loading unit engaged with the elongated body;

FIG. 19 is a schematic view of another embodiment of a locking element in a surgical instrument of the present utility model;

FIG. 20 is a schematic structural view of one embodiment of an elongate body of the surgical instrument of the present utility model;

FIG. 21 is a schematic distal end view of one embodiment of an elongate body of a surgical instrument of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.

In various embodiments of the present utility model, "distal/side" refers to the end of the surgical instrument that is distal to the operator when operated, and "proximal/side" refers to the end/side of the surgical instrument that is proximal to the operator when operated.

The following is one embodiment of a surgical instrument. Generally, an embodiment of the surgical instrument described herein is an endoscopic surgical cutting anastomosis instrument. However, it should be noted that the surgical instrument may also be a non-endoscopic surgical cutting anastomosis instrument, such as an open surgical instrument for open surgery.

In particular, fig. 1 shows a surgical instrument 100 that includes a handle assembly 10, an elongate body 20, and a disposable loading unit 30 removably attached to the distal end of the elongate body 20, connected in sequence from proximal to distal end. Wherein the handle assembly 10 is adapted to allow an operator to manipulate the surgical instrument 100, the handle assembly 10 being operable to control movement of the loading unit 30 through the elongate body 20 for performing a surgical procedure; such as clamping/closing, stapling/anastomosis, cutting, etc. of the tissue. The handle assembly 10 includes a handle body 12 that may be capable of being grasped by a user in a conventional manner. In a specific embodiment, the surgical instrument 100 is operated to load cell closure and firing by a trigger 13; in one embodiment, the surgical instrument 100 may also be configured to manipulate the loading unit to close and fire by pushing on a handle, pushing on a button 11, etc., to cause the loading unit 30 to perform cutting and stapling operations; in one embodiment, surgical instrument 100 may also be configured to manipulate the opening of the jaws of loading unit 30 to release tissue by way of a trigger 13, push button, or the like provided on handle assembly 10.

As shown in fig. 1 and 2, the elongate body 20 includes a tubular housing 21 defining a longitudinal axis C; a firing bar 22 is disposed within the tubular housing 21, with a proximal end of the firing bar 22 being coupled to an output end of a drive mechanism within the handle assembly 10 and a distal end being coupled to a firing member 35 of the loading unit 30 for transmitting a drive force of the drive mechanism to the firing member 35.

As shown in fig. 3, the loading unit 30 includes a proximal body portion 30a and a distal actuating portion 30b, the proximal body portion 30a and the distal actuating portion 30b being pivotally connected by a joint assembly 30 c. Distal actuating portion 30b includes a cartridge assembly 31 and an anvil assembly 32, and cartridge assembly 31 and anvil assembly 32 are relatively movable to close the jaws to grasp tissue. In a particular embodiment, the cartridge assembly 31 is operable to pivot toward the anvil assembly 32 until the jaws of the loading unit 30 are closed to grasp tissue; and, the cartridge assembly 31 is operable to pivot away from the anvil assembly 32 until the jaws of the loading unit 30 are opened to release tissue. In an alternative embodiment, anvil assembly 32 of loading unit 30 may be operated toward pivoting cartridge assembly 31 until the jaws of loading unit 30 are closed to grasp tissue; and anvil assembly 32 is operatively pivoted away from cartridge assembly 31 until the jaws of loading unit 30 are opened to release tissue. In the distal end performing portion 30b of the loading unit 30, the cartridge assembly 31 includes a cartridge 312, a cartridge base 311, and a push-staple sled (not shown) disposed in a cavity between the cartridge 312 and the cartridge base 311, the proximal end of the firing member 35 is coupled to the firing bar 22 in the elongate body 20, and the distal end of the firing member 35 abuts against the push-staple sled and is integrally slidable/movable in the direction of the longitudinal axis to perform a corresponding surgical operation. The cartridge assembly 31 further includes staple pushers positioned within the staple apertures of the cartridge 312 and staples; when the firing member 35 is driven to move from the proximal end to the distal end, the staple pusher sled is pushed to move, and the staple pusher sled acts on the staple pusher to push staples out of the staple cartridge 312, effecting stapling of the tissue.

In particular, as shown in fig. 3, 4, the proximal body portion 30a of the loading unit 30 may be inserted into the elongate body 20 and rotated relative to the elongate body 20 to lock the loading unit 30 thereto. The proximal body portion 30a includes an elongate outer tube 33, a frame 34 disposed within the outer tube 33, a firing member 35 slidably disposed within the frame 34; further, referring to fig. 3-6, in the proximal body portion 30a of the loading unit 30, the frame 34 is formed of a first half frame 34a and a second half frame 34b, wherein the proximal end of the first half frame 34a includes an engagement portion 34c for connection with the elongate body 20, the engagement portion 34c having an engagement tab 341 provided thereon for releasably engaging the elongate body 20 in a rotational snap connection. The first half-frame 34a and the second half-frame 34b define a sliding channel for slidably receiving the firing member 35. The firing member 35 includes an elongate firing beam 351, which firing beam 351 may be constructed from a single piece of material, or preferably from a plurality of stacked sheets. The distal end of the firing beam 351 is provided with a working portion 352, and the working portion 352 is provided with a cutting knife for forming a cut in tissue to be cut during firing. The proximal end of the firing beam 351 is provided with a connector 353, the connector 353 being formed as a sleeve structure having an opening, the proximal end of the connector 353 being provided with an aperture configured to receive the distal end of the firing bar 22 when the proximal end of the disposable loading unit 30 is engaged with the elongate body 20.

Referring to fig. 5-21, the loading unit 30 further includes a safety mechanism 37, wherein the safety mechanism 37 is used for locking the position of the firing member 35 when the loading unit 30 is in the initial unloaded state, preventing the firing cutter from moving relative to the frame 34 during transportation or assembly, and further preventing the firing cutter from being ejected by the firing bar 22 in advance and moving distally; the firing member 35 is unlocked when the loading unit 30 is engaged with the elongate body 20.

Fig. 5-10 illustrate a safety mechanism 37 in one embodiment of the surgical instrument 100 described above, comprising: a locking piece 371 connected to the frame 34, a first locking part arranged on the firing member 35, and a first biasing piece 372 arranged between the frame 34 and the locking piece 371, wherein when the loading unit is in an initial unloaded state, as shown in fig. 6, the locking piece 371 overcomes the biasing force of the first biasing piece 372 to be matched with the first locking part, so as to lock the movement of the firing member 35; as shown in FIG. 7, when the loading unit 30 is engaged with the elongate body 20, the lock 371 is disengaged from the first lock by the first bias 372, allowing movement of the firing member 35.

Referring to fig. 10, the first locking portion is a first locking groove 351a provided on the firing member 35, and the locking piece 371 is engaged in the first locking groove 351a when the loading unit is in the initial unloaded state. More specifically, the first locking groove 351a is formed on the firing beam 351, and when the loading unit 30 is in the initial unloaded state, a partial area of the locking piece 371 is locked in the first locking groove 351a, and the locking piece 371 locks the firing member 35 in the initial position due to the fact that the locking piece 371 is connected to the frame 34. In other alternative embodiments, the first locking portion may be a locking protrusion provided on the firing member 35, and the locking piece 371 is snapped onto a proximal end of the locking protrusion to achieve axial locking; in addition, the first locking groove 351a may be formed on the connector 353 of the firing member 35.

As described with reference to fig. 5-9, the safety mechanism 37 further comprises an unlocking trigger 373 rotatably connected with respect to the frame 34, wherein a proximal region of the unlocking trigger 373 is located on the engagement portion 34c of the frame 34 and adapted to cooperate with the elongated body 20 to achieve a circumferential limit, and a distal region of the unlocking trigger 373 is rotatably connected to a region between the outer wall of the frame 34 and the inner wall of the outer tube 33. When the loading unit 30 is in the initial unloaded state, a pressing part is formed in a distal region of the unlocking trigger 373 to act on the circumferential surface of the locking piece 371, so that the locking piece 371 cooperates with the first locking part to lock the firing member 35; when the loading unit 30 is engaged with the elongated body 20, the unlocking trigger 373 is engaged with the first trigger portion of the elongated body 20 and rotates relative to the frame 34, the locking member 371 is no longer pressed by the unlocking trigger 373, and the locking member 371 is switched to the unlocking position under the action of the first biasing member 372.

Specifically, referring to fig. 9, the unlocking trigger 373 includes a semi-annular sleeve body 373a, a proximal region of the unlocking trigger 373 is formed as a finger portion 373b extending proximally along a proximal end surface of the semi-annular sleeve body 373a, a distal region of the unlocking trigger 373 is formed as an extension protrusion 373c extending distally along a distal end surface of the semi-annular sleeve body 373a, and the extension protrusion 373c forms the pressing portion. The first triggering portion of the elongated main body 20 is a limiting groove (not shown in the drawing) formed on the inner wall of the housing of the elongated main body 20, when the engagement portion 34c of the loading unit 30 is engaged with the elongated main body 20 and then is rotationally engaged with the elongated main body 20, the finger portion 373b of the unlocking trigger 373 is engaged in the limiting groove and performs circumferential limiting, when the engagement portion 34c of the frame 34 rotates relative to the elongated main body 20, the unlocking trigger 373 rotates relative to the frame 34 by a set angle, the unlocking trigger 373 is away from the circumferential position where the locking piece 371 is located, at this time, the locking piece 371 moves radially under the action of the first biasing piece 372 until being disengaged from the engagement with the first locking portion, and finally abuts against the inner wall of the outer tube 33, thereby achieving unlocking of the firing member 35. To further stabilize the rotation of the unlocking trigger 373 with respect to the frame 34, the proximal region of the unlocking trigger 373 has two or more fingers 373b, and correspondingly, the elongated body 20 is provided with two or more first triggers in the circumferential direction.

Referring to fig. 6-8, the locking member 371 is formed in a fan-shaped ring structure, a first receiving groove 342 is provided at the outer side of the frame 34, the first receiving groove 342 is provided to extend along the circumferential direction thereof, the locking member 371 is received in the first receiving groove 342 when the loading unit 30 is in the initial unloaded state, and the first receiving groove 342 limits the axial position of the locking member 371 so as not to move relative to the frame 34. Specifically, the frame 34 is further provided with a second receiving groove 343 for receiving the unlocking trigger 373, the second receiving groove 343 extending in the circumferential direction, the second receiving groove 343 being located radially outward of the first receiving groove 342 and having a circumferential extension length greater than that of the first receiving groove 342. More specifically, the first biasing member 372 is a first elastic member, the first elastic member is located between the first accommodating groove 342 and the locking member 371, as shown in fig. 6, when the loading unit 30 is in the initial unloaded state, the unlocking trigger member 373 is located in the second accommodating groove 343 and at least partially covers the area of the first accommodating groove 342, the locking member 371 is located in the first accommodating groove 342 against the biasing force of the first elastic member under the holding action of the unlocking trigger member 373, and a part of the area of the locking member 371 is clamped in the first locking groove 351a of the firing member 35, so as to implement locking of the firing member 35. As shown in fig. 7, when the loading unit 30 is engaged with the elongated body 20, the unlocking trigger 373 is located in a side area of the second accommodation groove 343 away from the first accommodation groove 342, and the locking piece 371 is moved to the outside away from the first accommodation groove 342 and the first locking groove 351a under the action of the first elastic sheet and abuts against the inner wall of the outer tube 33, so as to unlock the firing member 35.

Fig. 10-15 illustrate a safety mechanism 37 in another embodiment of the surgical instrument 100, wherein in this embodiment, the locking member 371 is pivotally connected to the frame 34, as shown in fig. 11, the locking member 371 is formed in a sheet-shaped structure and is connected to the outer sidewall of the frame 34 by a pivot 374, and the pivot 374 may be integrally formed on the locking member 371 or may be connected to the locking member 371 as a separate component. As shown in fig. 15, the locking member 371 has a first end 371a and a second end 371b at both sides of the pivot 374 in the axial direction, and the first end 371a and the second end 371b of the locking member 371 form a lever structure centering on the pivot 374. Wherein, the first end 371a of the locking member 371 is adapted to cooperate with the unlocking trigger 373, and the second end 371b of the locking member 371 is adapted to cooperate with the first locking portion of the firing member 35. Specifically, the first biasing member 372 is a torsion spring (not shown) that is sleeved on the pivot 374, a first end 371a of the torsion spring abuts against the frame 34, and a second end 371b of the torsion spring abuts against the locking member 371. As shown in fig. 12, when the loading unit 30 is in the initial unloaded state, a partial area of the unlocking trigger 373 is pressed against the first end 371a of the locking piece 371, so that the second end 371b of the locking piece 371 is located in the first locking groove 351a, and the locking of the firing member 35 is achieved; as shown in fig. 13, when the loading unit 30 is engaged with the elongated body 20, the unlocking trigger 373 is away from the first end 371a of the locking member 371, and the second end 371b of the locking member 371 is away from the first locking groove 351a under the action of the torsion spring, so that the firing member 35 is unlocked.

Fig. 16-19 illustrate another embodiment of the safety mechanism 37 of the surgical instrument 100 described above, the safety mechanism 37 including a lock 371 attached to the firing member 35 and a second lock located on the frame 34, the lock 371 being a biasing member that is itself elastically deformable and applies a biasing force suitable for directly applying the biasing force to the frame 34. As shown in fig. 7, when the loading unit 30 is in the initial unloaded state, the locking piece 371 is engaged with the second locking part to lock the movement of the firing member 35; as shown in fig. 8, when the loading unit 30 is engaged with the elongate body 20, the lock 371 is operated to transition to a stored force state and disengage from the second lock, allowing movement of the firing member 35.

Specifically, as shown in fig. 17 and 18, the second locking portion is a second locking groove 345 provided on the frame 34, and when the loading unit 30 is in the initial unloaded state, the locking member 371 is in a stretched state and is engaged in the second locking groove 345; when the loading unit 30 is engaged with the elongated body 20, the locking piece 371 is in a retracted state and exits the second locking groove 345.

17-19, the lock 371 includes a main body portion and a locking end portion, the main body portion of the lock 371 being connected to the proximal end of the link 353 of the firing member 35; when the loading unit 30 is in the initial unloaded state, the end of the locking member 371 is locked in the second locking groove 345; when the loading unit 30 is engaged with the elongated body 20, the body portion of the locking member 371 engages the second trigger portion of the elongated body 20 and rotates relative to the frame 34, causing the end of the locking member 371 to be away from the second locking groove 345, unlocking the firing member 35. More specifically, the proximal end of the connecting member 353 is provided with a notch groove, the main body of the locking member 371 is inserted into the notch groove, and the locking end of the locking member 371 extends out of the connecting member 353 and is located in the outer peripheral area of the connecting member 353.

Referring to fig. 20 and 21, the second triggering portion of the elongated main body 20 is an open slot 22a formed at the distal end of the firing rod 22, when the loading unit 30 is engaged with the elongated main body 20, the main body portion of the locking element 371 is first inserted into the open slot 22a to achieve circumferential limitation, and when the loading unit 30 is rotationally engaged with respect to the elongated main body 20, the frame 34 rotates relative to the firing member 35 by a set angle against the biasing force of the locking element 371, so that the locking element 371 is compressed and the end portion thereof is moved out of the second locking slot 345, thereby achieving unlocking of the firing member 35.

More specifically, as shown in fig. 19, the locking member 371 is formed as a Z-shaped spring piece, which is embedded on the proximal end of the connecting member 353, and the proximal partial region of the Z-shaped spring piece is located outside the connecting member 353 to be adapted to be engaged with the open slot 22a of the elongated body 20, and both side ends of the Z-shaped spring piece are engaged with the two second locking slots 345 provided on the frame 34, respectively, when the loading unit 30 is in the initial unloaded state, so that the firing member 35 is fixed with respect to the frame 34. When the loading unit 30 is engaged with the elongated body 20, the Z-shaped spring is compressively deformed under the rotation of the frame 34, the two side ends of the Z-shaped spring are withdrawn from the second locking groove 345 on the frame 34, and the firing member 35 can slide relative to the frame 34.

In order to make the sliding of the Z-shaped elastic piece out of the second locking groove 345 smoother, the end of the Z-shaped elastic piece is bent into a semi-circular arc shape, and the groove arm of the second locking groove 345 is in smooth transition with the inner wall of the adjacent frame 34.

Specifically, referring to fig. 19, the Z-shaped spring plate includes a first arm 371-1, a second arm 371-2, and a connecting arm 371-3 therebetween, wherein the first arm 371-1 is disposed in parallel with the second arm 371-2. The ends of the first support arm 371-1 and the second support arm 371-2 of the Z-shaped elastic sheet are provided with arc bends. In the initial state, the first arm 371-1 forms an initial angle with the connecting arm 371-3 and the second arm 371-2 and the connecting arm 371-3, the Z-shaped spring sheet is compressively deformed under the rotation action of the frame 34 in the process of switching the loading unit from the unloaded state to the engaged state with the elongated body, and the angle between the first arm 371-1 and the connecting arm 371-3 and the angle between the second arm 371-2 and the connecting arm 371-3 become smaller until the first arm 371-1 forms a compression angle with the connecting arm 371-3 and the second arm 371-2 and the connecting arm 371-3 after the loading unit is engaged with the elongated body. For example, the initial included angle is an obtuse angle, and the compression included angle is a right angle or an acute angle.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While obvious variations or modifications are contemplated as falling within the scope of the present utility model.

Claims

1. A loading unit of a surgical instrument includes a frame housing a slidable firing member; the method is characterized in that: the safety mechanism comprises a locking piece connected to the firing member and a second locking part positioned on the frame, and the locking piece is a biasing member;

when the loading unit is in an initial unloaded state, the locking piece is matched with the second locking part to lock the movement of the firing component; when the loading unit is engaged with the elongate body, the lockout is transitioned to a stored-force state and disengaged from the second lockout allowing movement of the firing member.

2. The loading unit of a surgical instrument according to claim 1, wherein: the second locking part is a second locking groove arranged on the frame, and when the loading unit is in an initial unloaded state, the locking piece is in a stretched state and is clamped in the second locking groove; the locking member is in a retracted state and exits the second locking groove when the loading unit is engaged with the elongate body.

3. A loading unit for a surgical instrument according to claim 2, wherein: the firing member includes a connector at a proximal end thereof for receiving a firing bar within the elongate body when the loading unit is engaged with the elongate body.

4. A surgical instrument loading unit according to claim 3, wherein: the locking piece comprises a main body part and a locking end part, wherein the main body part of the locking piece is connected to the proximal end part of the connecting piece, and the locking end part is used for being matched with a second locking part on the frame.

5. The surgical instrument loading unit of claim 4, wherein: the proximal end of the connecting piece is provided with a notch groove, the main body of the locking piece is inserted into the notch groove, and the locking end of the locking piece extends out of the outer side of the peripheral surface of the connecting piece.

6. The surgical instrument loading unit of claim 4, wherein: the proximal portion of the body portion is adapted to cooperate with the second trigger portion of the elongate body to effect a circumferential stop, and the locking member is rotated a set angle relative to the frame when the loading unit is engaged with the elongate body.

7. The surgical instrument loading unit of claim 6, wherein: the proximal region of the frame is provided with an engagement portion that is coupled to the elongate body by means of a rotational snap-fit.

8. The surgical instrument loading unit of claim 6, wherein: the main body part is used for being matched with the second triggering part, and a part area is located on the outer side of the connecting piece.

9. A surgical instrument loading unit according to claim 3, wherein: the locking piece is formed into a Z-shaped elastic piece, two second locking parts are arranged on the frame corresponding to the Z-shaped elastic piece, the Z-shaped elastic piece is embedded on the proximal end of the connecting piece, and the two ends of the Z-shaped elastic piece are respectively matched with the two second locking parts.

10. The surgical instrument loading unit of claim 9, wherein: the Z-shaped elastic piece comprises a first support arm, a second support arm and a connecting support arm arranged between the first support arm and the second support arm, wherein the first support arm and the second support arm are arranged in parallel.

11. The surgical instrument loading unit of claim 10, wherein: the ends of the first support arm and the second support arm of the Z-shaped elastic sheet are provided with arc bends.

12. The surgical instrument loading unit of claim 10, wherein: when the loading unit is switched from the unloaded state to the engagement state with the elongated body, the included angles between the first support arm and the connecting support arm and between the second support arm and the connecting support arm are from large to small.

13. A surgical instrument comprising an elongate body and the loading unit of any one of claims 1-12, wherein the locking member cooperates with the second trigger portion of the elongate body to achieve a circumferential limit when the loading unit is coupled to the elongate body.

14. A surgical instrument according to claim 13, wherein: the second triggering part of the slender main body is an open slot formed at the distal end of the firing bar, and when the loading unit is combined with the slender main body, a part of the area of the locking piece is inserted into the open slot.