CN111743589A

CN111743589A - Loading unit and anastomat

Info

Publication number: CN111743589A
Application number: CN202010694706.8A
Authority: CN
Inventors: 李宇
Original assignee: Reach Surgical Inc
Current assignee: Reach Surgical Inc
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-10-09
Anticipated expiration: 2040-07-17
Also published as: CN111743589B

Abstract

The invention relates to the technical field of medical instruments, in particular to a loading unit and a anastomat, wherein the loading unit comprises: a cannula assembly, an end effector operably coupled to the cannula assembly; the sleeve assembly comprises a firing rod assembly, a frame assembly for accommodating the firing rod assembly and a sleeve shell sleeved on the frame assembly, and comprises a locking structure, a locking part and a limiting structure, wherein when the locking part is in a locking position, the locking part is matched with the limiting structure to lock the relative motion between the frame assembly and the firing rod assembly; when the locking piece is driven to enable at least one part of the locking piece to be separated from the limiting structure and enter an unlocking position, the firing rod assembly is allowed to move relative to the frame assembly. The invention provides an anastomat and a loading unit thereof, which prevent a locking structure from being exposed outside the loading unit and ensure that a locking state is effective.

Description

Loading unit and anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a loading unit detachably mounted on an anastomat and the anastomat mounted with the loading unit.

Background

Staplers are commonly used with loading units to perform open or laparoscopic procedures to accomplish suturing, cutting, and stapling of target tissue. In the existing stapler with the loading unit and the elongated body of the stapler detachable, before the stapler is used, the loading unit needs to be installed on the elongated body of the stapler and firmly fixed. After the current loading unit is used, the anastomat needs to retract driving pieces such as a knife and a firing rod to an original position and then replace the loading unit, when a driving rod in an elongated body of the anastomat does not retract to the position, a driving rod connector in the loading unit is contacted with the driving rod in the elongated body, a sleeve assembly of the loading unit and a shell of the elongated body are not inserted to the position, when the sleeve assembly of the loading unit and the shell of the elongated body are inserted to the position, the firing rod already pushes the firing rod connector to drive the firing nail and the cutting knife to protrude, and the protruding nail and the cutting knife can damage tissue during normal use. Simultaneously, the cutting knife locating piece is fixed and expose outside and make things convenient for the cutting position of doctor's definite cutting knife in loading unit, and drive component is driven in advance along the extending direction of body when mistake touching cutting knife locating piece when leaving factory to detect or doctor's operation.

Therefore, when the loading unit is installed on the anastomat, or the end effector of the anastomat is required to be ensured not to be driven in advance in the installation process, if the staples in the staple box driven in advance are jacked up in advance and protrude out of the surface of the staple box, the cutting knife protrudes out of the jaw in advance, and the staples in the staple box damaged by tissue weaving cannot be jacked up in advance and protrude out of the surface of the staple box when the staples and the cutting knife are normally used after being driven and triggered in advance, so that the staples are prevented from being triggered in advance to damage the tissue.

The anastomat in the prior art comprises a handle and an end effector, meanwhile, a driving part is arranged inside the end effector, a notch is formed in one side of the tail of the driving part, and a locking piece is installed on the notch, wherein one part of the locking piece is located in a loading unit, and the other part of the locking piece is arranged outside the loading unit, so that the driving part is prevented from being driven in advance to cause the advance jacking of a staple in a staple box before the loading unit is installed on the anastomat or in the installation process through the locking piece.

But at the in-process of installation, the pipe wall of anastomat touches the locking piece that is located the end effector outward, furtherly, at actual operation's in-process, also can exist the people and touch the locking piece that exposes outside, the locking piece is triggered in advance to these two kinds of circumstances of touching the locking piece all can lead to the locking piece for the locking piece is inefficacy, drive component is driven in advance along the extending direction of body when the mistake touches the cutting knife locating piece when leaving factory detection or doctor's operation, lead to the staple in the nail casket to be jack-up in advance, thereby make the staple be fired in advance and weave into the damage to the group.

Disclosure of Invention

Therefore, the technical problem to be solved by the present invention is to overcome the defect that when the loading unit is mounted on the elongated body, the driving assembly inside the loading unit is easily driven in advance, so that the staples in the staple cartridge protrude out of the surface of the staple cartridge, so as to provide a loading unit and a stapler, wherein when the loading unit is mounted on the elongated body, the driving assembly inside the end effector is not easily driven in advance, so that the staples in the staple cartridge protrude out of the surface of the staple cartridge.

In order to solve the above technical problem, the present invention provides a loading unit, including: a cannula assembly, an end effector operably coupled to the cannula assembly; the sleeve subassembly includes the firing bar subassembly, holds the frame subassembly of firing bar subassembly and the cover of locating the frame subassembly casing, further includes:

the locking structure comprises a locking piece and a limiting structure, and when the locking piece is in a locking position, the locking piece is matched with the limiting structure to lock the relative motion between the frame assembly and the firing rod assembly; when the locking piece is driven to enable at least one part of the locking piece to be separated from the limiting structure and enter an unlocking position, the firing rod assembly is allowed to move relative to the frame assembly.

Furthermore, limit structure further includes the second spacing hole that sets up in the firing pole subassembly, and when the locking piece moved to the unblock position, the locking piece at least with the spacing hole of second breaks away from.

Still further, limit structure includes the through-hole that sets up on the frame subassembly, at least a part is held in the through-hole to the locking piece.

Furthermore, limit structure still further including set up in the first spacing hole of frame subassembly, at least a part of locking piece holds in first spacing downthehole, the through-hole with first spacing hole is followed the length extending direction interval of frame subassembly sets up.

Furthermore, the first limiting hole and the second limiting hole are located on the same axis.

Further, still include the space of stepping down, the space of stepping down sets up at least one of them of frame subassembly and sleeve casing, at least part of locking piece is held in the space of stepping down.

Further, the lock member includes:

a main body frame;

and the limiting rod and the unlocking rod are arranged on the main body frame at intervals.

When the locking piece is in the locking position, the limiting rod of the locking piece is accommodated in the second limiting hole; when the locking piece is in the unlocking position, the limiting rod of the locking piece is at least separated from the second limiting hole.

Further, the unlatching lever of the latching member is at least partially received in the through hole.

Further, the end of the unlocking rod is provided with a first guide surface.

Further, the lockout member also includes a biasing member that provides a biasing force to the lockout member to retain and/or return to a locked position.

The invention also provides a stapler comprising a handle assembly and an elongated body, wherein the elongated body extends distally from a distal end of the handle assembly, further comprising a loading unit as described above, the loading unit being removably mounted at the distal end of the elongated body.

Furthermore, a driving rod is accommodated in the slender rod, a pushing structure is arranged at the far end of the driving rod, and the pushing structure drives the locking piece of the locking structure to move to the unlocking position of the locking piece.

Furthermore, the far end of the driving rod is provided with a guide sliding chute and a locking groove which extend along the direction of the longitudinal axis and are communicated with each other, and the abutting structure comprises a first abutting surface which is arranged at the far end side of the driving rod and partially inclines towards the axis direction of the far end of the driving rod and a second abutting surface which is arranged at the near end of the locking groove and inclines towards the opposite direction of the axis.

Furthermore, the far end of the driving rod is inserted into the frame assembly, the pushing structure drives the locking piece to move towards the unlocking position of the locking piece and is continuously inserted into the far end of the driving rod to the firing rod connector, and the far end of the driving rod and the frame assembly are driven to rotate relatively to be connected with each other. The technical scheme of the invention has the following advantages:

1. the loading unit provided by the invention is provided with the locking structure, and the locking structure is arranged between the sleeve shell and the frame assembly, so that the frame assembly and the firing rod assembly are in a locking state or an unlocking state, the locking structure is prevented from being exposed outside the loading unit, and the situation that the pipe wall of the anastomat touches the locking piece in the process of installing the loading unit to the anastomat is prevented; or in the process of actual operation, the locking state is disabled or the loading unit cannot be mounted on the elongated body due to the fact that the locking member exposed outside is touched by manual misoperation.

2. The anastomat provided by the invention comprises a device unit with a locking structure and a far end of the driving rod with a pushing structure, wherein the far end of the driving rod drives the frame assembly and the firing rod assembly to be switched between a locking state and an unlocking state through insertion and rotation movement, so that the locking structure is prevented from being exposed outside the loading unit, and the situation that the pipe wall of the anastomat touches the locking piece in the process of installing the loading unit into the anastomat is prevented; or in the process of actual operation, the locking state is disabled or the loading unit cannot be mounted on the elongated body due to the fact that the locking member exposed outside is touched by manual misoperation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural diagram of a stapler according to the present invention;

FIG. 2 is a schematic view of a handle drive system;

FIG. 3 is an exploded view of the loading unit;

FIG. 4 is a schematic structural view of a loading unit;

FIG. 5 is a schematic structural view of the firing rod assembly;

FIG. 6 is a schematic view of the distal end of the drive rod;

figure 7 is a schematic view of the structure of the loading unit and the insertion movement of the elongated body;

figure 8 is a schematic view of the structure of the loading unit during the insertion movement with the elongated body;

FIG. 9 is a schematic view of the loading unit and the rotational movement of the elongated body;

FIG. 10 is a schematic view of the uninstalled configuration of the loading unit and the elongated body;

FIG. 11 is a schematic view of the latch member;

FIG. 12 is a bottom view of FIG. 12;

FIG. 13 is a schematic view of a frame assembly;

FIG. 14 is a schematic structural view of a firing bar connector;

figure 15 is a partial cross-sectional view of the connection of the loading unit and the elongated body in a locked state;

figure 16 is a partial cross-sectional view of the connection of the loading unit and the elongated body in an unlocked (released) state;

FIG. 17 is a schematic view of the structure in a first position;

FIG. 18 is a schematic view of the locking member intermediate its first position and its second position;

FIG. 19 is a schematic view of the second position;

FIG. 20 is a schematic view of the third position;

fig. 21 is a schematic structural view of the fourth position.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

In various embodiments of the present invention, "distal/side" refers to the end/side of the stapler that is distal from the user when operated, and "proximal/side" refers to the end/side of the stapler that is proximal to the user when operated.

Fig. 1 illustrates a stapler 100 according to an embodiment of the present invention, the stapler 100 being usable under endoscopic surgery, comprising a handle assembly 80, an elongated body 10 and a loading unit 50, wherein the elongated body 10 extends distally from a distal end of the handle assembly 80, the loading unit 50 is detachably mounted at a distal end of the elongated body 10, the loading unit 50 further comprises a cannula assembly 60 and an end effector 70, wherein the end effector 70 is adapted to perform a specific surgical operation, such as clamping, stapling/anastomosing, cutting, etc. tissue. As further shown in FIG. 1, the handle assembly 80 includes a trigger 81 and a grip portion 82. When the trigger 81 is pulled in the direction of the gripping portion 82, jaw closure of the end effector 70 is achieved. In addition, trigger 81 can also be configured to drive the firing of the stapler 100.

As further shown in fig. 1 and 10, the stapler 100 according to an embodiment of the present invention further includes a rotating head 86, wherein the rotating head 86 is mounted on the distal side of the handle assembly 80 and is fixedly connected to the proximal end of the elongated body 10, and when the rotating head 86 is operated to rotate about the longitudinal axis C of the stapler 100, the elongated body 10 and the loading unit 50 are rotated together. In addition, the stapler 100 according to the embodiment of the present invention further includes a turning knob 87, wherein the turning knob 87 is rotatably installed on the rotating head 86 and is adapted to drive the end effector 70 of the loading unit 50 to perform a pivoting motion when the turning knob 87 is operated to rotate.

Referring to fig. 2, the stapler 100 according to an embodiment of the present invention includes a drive system 89, the drive system 89 including a gear assembly 891, a rack assembly 892 and a drive rod 893, the gear assembly 891 being connected to the output of the power unit 85 and the rack assembly 892, respectively, the drive rod 893 being disposed partially distally within the elongated body 10 and connected proximally to the rack assembly 892. In other embodiments, the power device 85 is further provided with a reduction box 852, and the motor 851 is connected with the gear assembly 891 through the reduction box 852 to output power for the electric stapler 100.

FIG. 3 is an exploded view of a loading unit 50 according to an embodiment of the present invention, and in particular, the cannula assembly 60 includes a cannula housing 601 and a frame assembly 602, the frame assembly 602 being received within the cannula housing 601 and being comprised of an upper frame portion 602a and a lower frame portion 602b adapted to receive the firing rod assembly 61 and provide corresponding support and restraint. In addition, the end effector 70 of the loading unit 50 according to the present embodiment is hinged to the sleeve assembly 60 by the hinge assembly 51, so that the end effector 70 can perform a pivoting motion relative to the sleeve assembly 60 to perform a bending function.

With continued reference to FIG. 3, the end effector 70 includes a magazine base 71, a magazine assembly 72, and an anvil assembly 73, the magazine assembly 72 being removably or non-removably mounted within the magazine base 71, the anvil assembly 73 having a proximal end pivotally coupled to the proximal end of the magazine base 71 such that the anvil assembly 73 is capable of pivotal movement relative to the magazine base 71 and cooperates with the magazine surface 721 of the magazine assembly 72 to clamp tissue disposed therein.

FIG. 5 illustrates a particular configuration of the firing rod assembly 61, wherein the firing rod assembly 61 includes a firing rod body 610 and a firing rod connector 611 disposed at a proximal end of the firing rod body 610, wherein the firing rod connector 611 is adapted to be detachably coupled to a distal end 894 of the drive rod 893 (see FIG. 10), such that the drive rod 893 is driven by the drive system 89 in a reciprocating motion along a longitudinal axis C of the stapler 100 and the firing rod body 610 of the firing rod assembly 61 is driven in a reciprocating motion by the drive system 611 to effect advancement (distal motion) and retraction (proximal motion) of the drive rod assembly 61.

The loading unit 50 further includes a cutter positioning block 31. As shown in fig. 3 to 5, the cutting knife positioning block 31 is disposed in the loading unit 50 and fixedly connected to the cutting knife 6102 at the distal end of the firing rod body 610, so that when the firing rod assembly 61 drives the cutting knife 6102 to reciprocate along the longitudinal axis C of the stapler 100 (to fire and cut tissue or to return to an initial position), the cutting knife positioning block 31 is present outside the end effector 70 to indicate a specific position of the movement of the cutting knife 6102.

Fig. 7 to 9 and 10 show the specific structure and movement of the loading unit 50 mounted and locked on the elongated body 10, the outer wall of the proximal end of the frame assembly 602 of the cannula assembly 60 of the loading unit 50 is provided with a locking protrusion 604, the longitudinal axis C of the inner wall of the distal end of the elongated body 10 is provided with a mounting chute 12, the elongated body 10 is further provided with a locking hole 11 at the proximal end of the mounting chute 12 and at 30-45 degrees in the circumferential direction, firstly, the insertion movement of the mounting lock, specifically, the locking protrusion 604 of the loading unit 50 is inserted into the elongated body 10 along the mounting chute 12 to the proximal end of the mounting chute 12; then a rotational movement is entered, in particular, rotating the loading unit 50 such that the locking protrusion 604 is screwed into the locking hole 11 to lock the position of the loading unit 50 with the elongated body 10, completing the installation locking.

With continued reference to FIGS. 5 and 6, the proximal end of the firing bar body 610 in the firing bar assembly 61 has opposing tabs 6101, the drive bar distal end 894 has a longitudinal axis C-oriented guide chute 8941 and a locking recess 8942, the installation-locked insertion motion, the drive bar distal end 894 is inserted into the mounting hole 6112 of the firing bar connector 611 of the firing bar assembly 61 while the tabs 6101 slide along the guide chute 8941; upon installation of the locked rotational motion, the tab 6101 rotates into the locking recess 8942 to complete the connection of the drive rod distal end 894 with the firing rod assembly 61.

The stapler 100 provided by the embodiment of the present invention further includes a locking structure disposed in the loading unit 50, wherein the locking structure has a locking state for locking the relative position between the frame assembly 602 and the firing rod assembly 61, and an unlocking (releasing) state for allowing the firing rod assembly 61 to move relative to the frame assembly 602.

Referring to fig. 11 to 16, the locking structure includes a locking member 20 and a limiting structure 21 matched with the locking member 20. The lockout member 20 is operable to move relative to the stop structure 21 to lock/unlock the movement of the firing rod assembly 61 relative to the frame assembly 602. Specifically, in the present embodiment, as shown in fig. 11 and 12, the locking member 20 includes a main body frame 201, a limiting rod 202 and an unlocking rod 203, wherein the limiting rod 202 is disposed at a distal end of the main body frame 201, extends perpendicular to the main body frame 201, or forms an angle with the main body frame 201; the unlocking rod 203 is disposed near the limiting rod 202, spaced from the limiting rod 202, and extends perpendicular to the main body frame 201 or forms a certain angle with the main body frame 201.

Correspondingly, as shown in fig. 13 and 14, the limiting structure 21 includes a first limiting hole 211 disposed on the frame assembly 602 and a second limiting hole 212 disposed on the firing rod assembly 61, and in addition, the limiting structure 21 further includes a through hole 213 disposed on the frame assembly 602, and the first limiting hole 211 and the through hole 213 are disposed at intervals along the length extending direction of the frame assembly 602 respectively. The second position-limiting hole 212 is disposed on the firing bar connector 611 at the proximal end of the firing bar assembly 61, and the projection of the second position-limiting hole 212 on the frame assembly 602 at least partially overlaps the first position-limiting hole 211 on the frame assembly 602.

In an alternative embodiment, the first position-limiting hole 211 of the position-limiting structure 21 communicates with the through hole 213 to form a through hole for position-limiting.

As shown in fig. 15, the locking structure is in a locked state, the position limiting rod 202 of the locking member 20 is located in the first position limiting hole 211 and the second position limiting hole 212, and at least a portion of the unlocking rod 203 of the locking member 20 is located in the through hole 213, at which time the relative movement between the firing rod assembly 61 and the frame assembly 602 is locked. In order to enable the locking structure to be rapidly inserted into the first limiting hole 211 and the second limiting hole 212, the second limiting hole 212 and the first limiting hole 211 can be arranged on the same axis, so that the positioning is more accurate and the installation is convenient.

As shown in FIG. 16, the lockout structure is in an unlocked (released) state, and the stop bar 202 of the lockout member 20 is disengaged from the second stop hole 212, thereby allowing the firing bar assembly 61 to move relative to the frame assembly 602.

During installation of loading unit 50 into elongated body 10 of stapler 100 according to embodiments of the present invention, distal end 894 of drive lever 893 in elongated body 10 is gradually moved closer to the locking structure, such that when drive lever distal end 894 contacts and moves further distally with lock release lever 203 of lock member 20, drive lever distal end 894 is able to eject lock member 20, causing stop bar 202 of lock member 20 to at least disengage from second stop hole 212, unlocking (releasing) firing bar assembly 61, allowing it to move relative to frame assembly 602.

With continued reference to fig. 11 and 12, to enable the locking member 20 to be ejected more easily, a first guide surface 2031 is provided at the end of the lock release lever 203, and accordingly, as shown in fig. 6, an abutting structure including a first abutting surface 8944 is provided at the drive lever distal end 894. In this embodiment, the first abutting surface 8944 is a surface partially inclined toward the axial center of the distal end 894 of the driving lever. The first guide surface 2031 of the lock release lever 203 serves as a guide for movement with the first abutting surface 8944, so that the lock release lever 203 is more smoothly and easily abutted by the first abutting surface 8944 and moved to the unlocking (releasing) position.

In this embodiment, the length of the unlocking lever 203 is greater than the length of the limiting rod 202, and when the distal end 894 of the driving rod is not connected with the firing rod connector 611, the unlocking lever 203 blocks at least a portion of the mounting hole 6112 of the firing rod connector 611.

With further reference to fig. 13, 15 and 16, a recess is formed at the proximal end of the frame member 602, the first position-limiting hole 211 and the through hole 213 of the frame member 602 are disposed in the recess, and a space 603 is formed between the recess and the casing 601 for accommodating at least a portion of the locking member 20. The locking member 20 of the locking structure is arranged in the abdicating space 603, so that the locking member 20 is prevented from being exposed outside the sleeve assembly 60, and the loading unit 50 is prevented from being disabled due to the fact that the locking structure exposed outside is touched by human misoperation in the process of packaging, transporting or installing the loading unit 50 on the elongated body 10.

Alternatively, the cavity of the relief space 603 may be formed in the ferrule housing 601, for example, by forming a protrusion on the ferrule housing 601, and the locking structure is disposed in the protrusion and inserted into the frame assembly 602.

During installation of loading unit 50 onto elongated body 10 of stapler 100, drive rod distal end 894 moves toward loading unit 50 and into firing rod assembly 61, driving lock member 20 toward space 603 to unlock the relative position of firing rod assembly 61 to frame assembly 602 and further allowing connection of drive rod distal end 894 to firing rod connector 611 of firing rod assembly 61 as drive rod distal end 894 moves into contact with lock release lever 203 of lock member 20 and continues to move distally.

With continued reference to fig. 6, the pushing structure further includes a second pushing surface 8945, the second pushing surface 8945 is a surface that is disposed at the proximal end of the locking groove 8942 and is inclined toward the axial center in an opposite direction, accordingly, as shown in fig. 12, the unlocking rod 203 further includes an arc surface 2032, and when the loading unit 50 is mounted to the elongated body 10 and performs a rotating motion, the second pushing surface 8945 pushes against the arc surface 2032 of the unlocking rod 203 to guide the locking member 20 to move to the unlocking position. Further, the lock release lever 203 includes a second guide surface 2033, and the second guide surface 2033 guides the movement of the drive lever distal end 894 during the unloading of the loading unit 50 and elongated body 10.

Figures 17 to 21 show the positions and configurations of movement of the locking structure from its locked to its unlocked condition, including a first position, a second position, a third position and a fourth position, during assembly of the loading unit 50 with the elongated body 10. To better describe the movement pattern of the lockout structure, the firing bar connector 611 is omitted from FIGS. 17-21. Specifically, the distal end 894 of the driving lever is inserted into the sleeve assembly 60 and moved to a first position (as shown in fig. 17), in which the first abutting surface 8944 of the distal end 894 of the driving lever abuts against the first guiding surface 2031 of the locking member 20; as the driving lever 893 further moves distally, the locking member 20 is gradually lifted, the outer surface 8943 of the driving lever distal end 894 abuts against the curved surface 2032 of the locking member 20 (as shown in fig. 18), and moves to the second position (as shown in fig. 19), at which time the lock release lever 203 falls into the locking groove 8942; the actuation lever 893 is further moved distally into a third position (shown in fig. 20), in which the second abutting surface 8945 of the actuation lever distal end 894 abuts the arcuate surface 2032 of the latch member 20; when the driving lever 893 is rotated, the arc-shaped surface 2032 of the locking member 20 moves to the fourth position (as shown in fig. 21) where it abuts against the outer surface 8943 of the distal end of the driving lever again under the guidance of the second abutting surface 8945, and at this time, the limiting rod 202 of the locking member 20 is separated from the second limiting hole 212, and the locking structure 2 reaches the unlocking state.

In an alternative embodiment, as shown in fig. 11, 15 and 16, the locking member 20 further includes a biasing member 204 disposed on a side of the body frame 201 facing away from the position-limiting rod 202 to provide a biasing force to maintain and/or return the locking member 20 to the locked state. Specifically, the biasing member 204 provides a biasing force to the lockout member 20 when in the lockout condition to stabilize the lockout member 20 in the lockout condition, preventing the lockout member 20 from shifting toward the relief space 603, while ensuring that the lockout structure is in an effectively locked condition.

As shown in fig. 11, the biasing member 204 is a spring, and one end of the spring is connected to one end of the main body frame 201 away from the stopper rod 202. Although the biasing member 204 may be a spring or the like.

As an alternative embodiment, the locking structure described in the above embodiment may also be mounted on a manual endoscopic stapler, which is not described herein again.

An embodiment of the present invention further provides a loading unit detachably mounted to a stapler, including: a cannula assembly 60, an end effector 70, said end effector 70 operably connected to the cannula assembly 60; the sleeve assembly 60 comprises a firing rod assembly 61, a frame assembly 602 for accommodating the firing rod assembly 61, and a sleeve housing 601 sleeved on the frame assembly 602, and further comprises: a lockout structure comprising a lockout member 20 and a limit structure 21, said lockout member 20 cooperating with said limit structure 21 to lock relative movement between said frame assembly 602 and firing rod assembly 61 when said lockout member 20 is in a locked position; when the lockout member 20 is actuated to disengage at least a portion of the lockout member from the stop structure 21 into an unlocked position, the firing rod assembly 61 is permitted to move relative to the frame assembly 602.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are intended to be within the scope of the invention.

Claims

1. A loading unit, comprising: a cannula assembly (60), an end effector (70), the end effector (70) being operably connected to the cannula assembly (60); the sleeve assembly (60) comprises a firing rod assembly (61), a frame assembly (602) accommodating the firing rod assembly (61), and a sleeve housing (601) sleeved on the frame assembly (602), and is characterized by further comprising:

a lockout structure comprising a lockout member (20) and a limit structure (21), the lockout member (20) cooperating with the limit structure (21) to lock relative movement between the frame assembly (602) and the firing rod assembly (61) when the lockout member (20) is in a locked position; when the lockout member (20) is actuated to disengage at least a portion thereof from the stop structure (21) into an unlocked position, the firing rod assembly (61) is permitted to move relative to the frame assembly (602).

2. The loading unit according to claim 1, wherein the limiting structure (21) further comprises a second limiting hole (212) provided to the firing rod assembly (61), and the lock member (20) is disengaged from at least the second limiting hole (212) when the lock member (20) is moved to the unlocked position.

3. Loading unit (50) according to claim 2, wherein said limit structure (21) further comprises a through hole (213) provided on said frame assembly (602), said blocking member (20) being at least partially housed in said through hole (213).

4. The loading unit according to claim 3, wherein the limiting structure (21) further comprises a first limiting hole (211) provided in the frame assembly (602), at least a portion of the locking member (20) is accommodated in the first limiting hole (211), and the through hole (213) and the first limiting hole (211) are provided at a distance from each other along the length extension direction of the frame assembly (602).

5. The loading unit according to claim 4, wherein the first position-limiting hole (211) and the second position-limiting hole (212) are located on the same axis.

6. The loading unit according to claim 1, further comprising a relief space (603), the relief space (603) being provided in at least one of the frame assembly (602) and the cannula housing (601), at least a portion of the latch (20) being received within the relief space (603).

7. Loading unit according to any one of claims 1-6, wherein the lock (20) comprises:

a main body frame (201);

and the limiting rod (202) and the unlocking rod (203) are arranged on the main body frame (201) at intervals.

8. The loading unit according to claim 7, wherein the limit lever (202) of the lock member (20) is received in the second limit hole (212) when the lock member (20) is in the locked position; when the locking piece (20) is in the unlocking position, the limiting rod (202) of the locking piece (20) is separated from at least the second limiting hole (212).

9. Loading unit according to claim 7, wherein the unlocking lever (203) of the locking member (20) is at least partially housed within the through hole (213).

10. A unit load according to claim 7, characterized in that the end of the release lever (203) is provided with a first guide surface (2031).

11. The loading unit according to claim 7, wherein the lockout member (20) further comprises a biasing member (204), the biasing member (204) providing the lockout member (20) with a biasing force to retain and/or return to the locked position.

12. A stapler comprising a handle assembly (80) and an elongated body (10), wherein the elongated body (10) extends distally from a distal end of the handle assembly (80), characterized in that it further comprises a loading unit (50) according to any one of claims 1-10, said loading unit (50) being detachably mounted at the distal end of the elongated body (10).

13. The stapler according to claim 12, wherein said elongated lever (10) houses a driving lever (893) therein, a distal end (894) of said driving lever (893) being provided with an abutting structure which drives a locking member (20) of said locking structure to move to its unlocked position.

14. The stapler according to claim 13, wherein the driving lever distal end (894) is provided with a guide runner (8941) and a locking groove (8942) extending in the longitudinal direction and communicating with each other, and the urging structure includes a first urging surface (8944) provided on the end side of the driving lever distal end (894) and inclined partially toward the axial center of the driving lever distal end (894), and a second urging surface (8945) provided on the proximal end of the locking groove (8942) and inclined in the opposite direction to the axial center.

15. The stapler of any one of claims 12-14, wherein the drive rod distal end (894) is inserted into the frame assembly (602), the push-against structure driving the latch member (20) toward its unlatched position and continuing to insert the drive rod distal end (894) into the firing rod connector (611), the drive rod distal end (894) and the frame assembly (602) being driven for relative rotation to interconnect.