Technical problemThe invention mainly aims to provide a nail bin assembly which is higher in reliability and capable of replacing a cutting knife, and a surgical instrument with the nail bin assembly.
Technical solutionIn a first aspect, an embodiment provides a surgical instrument comprising:
a handle assembly;
a barrel assembly, the proximal end of the barrel assembly being connected to the handle assembly, the barrel assembly including a transmission mechanism;
The gun barrel assembly comprises a gun barrel assembly, an actuator assembly, a mounting cavity, a first clamping jaw, a second clamping jaw, a first clamping jaw and a second clamping jaw, wherein the distal end of the gun barrel assembly is connected with the actuator assembly, the actuator assembly comprises a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are movably connected, and the first clamping jaw and the second clamping jaw can move relatively to realize closing and opening;
The nail bin assembly is arranged in the mounting cavity and comprises a mounting seat, a nail pushing piece and a cutting knife, the mounting seat is provided with a plurality of mounting positions for mounting the stitching nails, the nail pushing piece and the cutting knife are movably arranged on the mounting seat, the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat, and the proximal end of the mounting seat is provided with a cocking position;
And a blocking knife member switchable from a first state to a second state, the blocking knife member in the first state allowing movement of the cutting knife from the cocked position to the distal end of the mount, the blocking knife member in the second state for preventing movement of the cutting knife to the cocked position;
The transmission mechanism can be matched with the cutting knife at the cocked position, when the cutting knife is positioned at the cocked position, the transmission mechanism is allowed to drive the cutting knife at the cocked position to move from the proximal end of the mounting seat to the distal end of the mounting seat, and the knife blocking piece is switched from the first state to the second state in the process of moving the cutting knife from the proximal end to the distal end.
In one embodiment, the cutter blocking member is configured as an elastic member, when the cutter is located at the triggerable position, the elastic member can be contracted to a first state under the pressure of the cutter or the nail pushing member, and after the transmission structure fires the cutter, the elastic member can be stretched to a second state under the action of self elastic force so as to prevent the cutter from moving from the distal end of the mounting seat to the triggerable position.
In one embodiment, the mount has a tissue engaging surface, and the resilient member is capable of collapsing and expanding in a plane of movement that is non-parallel to the tissue engaging surface to effect switching between the first and second states.
In one embodiment, the elastic member is connected to the mounting base.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the nail bin top wall, the two nail bin side walls are arranged on two opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is arranged opposite to the nail bin top wall, a first end of the elastic piece is connected with the protection plate, a second end of the elastic piece contracts towards the protection plate in a first state, and a second end of the elastic piece stretches towards the nail bin top wall in a second state.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the nail bin top wall, the two nail bin side walls are arranged on two opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is opposite to the nail bin top wall, a first end of the elastic piece is connected with the nail bin top wall, a second end of the elastic piece contracts towards the nail bin top wall in a first state, and a second end of the elastic piece stretches towards the protection plate in a second state.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the opposite sides of the nail bin top wall, the two nail bin side walls are arranged on the opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is opposite to the nail bin top wall, a first end of the elastic piece is connected with one of the nail bin side walls, a second end of the elastic piece is contracted towards the nail bin side wall where the first end is located in a first state, and the second end of the elastic piece is stretched towards the nail bin side wall far away from the first end in a second state.
In one embodiment, the first end of the elastic member is connected to the cutter, the second end of the elastic member is contracted toward the cutter in the first state, and the second end of the elastic member is extended away from the cutter in the second state.
In one embodiment, the first end of the elastic member is connected to the cutter, the second end of the elastic member is contracted toward the cutter in the first state, and the second end of the elastic member is extended away from the cutter in the second state.
In one embodiment, the elastic member is configured as a spring or a leaf spring.
In one embodiment, the cutter blocking member is rotatably disposed, and when the transmission mechanism drives the cutter to move from the cocked position to the distal end of the mounting seat, the cutter blocking member can be driven to rotate relative to the mounting seat, so that the cutter blocking member is switched from the first state to the second state.
In one embodiment, the actuator assembly has a locking portion for locking with the transmission mechanism to prevent axial movement of the transmission mechanism along the actuator assembly, the transmission mechanism has a first unlocking portion, the cutting blade has a second unlocking portion, and the first unlocking portion of the transmission mechanism is engageable with the second unlocking portion of the cutting blade to unlock the locking portion from the transmission mechanism when the cutting blade is in the cockable position.
In a second aspect, an embodiment provides a staple cartridge assembly comprising:
the mounting seat is provided with a plurality of mounting positions for mounting the stitching nails, and the proximal end of the mounting seat is provided with a triggerable position;
the nail pushing piece is movably arranged on the mounting seat;
the cutting knife is movably arranged on the mounting seat, and the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat;
The knife blocking device comprises a knife blocking piece, a knife blocking piece and a knife driving mechanism, wherein the knife blocking piece can be switched from a first state to a second state, the knife blocking piece allows the knife to move from a cocked position to the far end of a mounting seat in the first state, the knife blocking piece is used for preventing the knife from moving to the cocked position in the second state, when the knife is located at the cocked position, a transmission mechanism of a surgical instrument is allowed to drive the knife located at the cocked position to move from the near end of the mounting seat to the far end of the mounting seat, and the knife blocking piece is switched from the first state to the second state in the process of moving the knife from the near end to the far end.
In one embodiment, the cutter blocking member is configured as an elastic member, when the cutter is located at the triggerable position, the elastic member can be contracted to a first state under the pressure of the cutter or the nail pushing member, and after the transmission structure fires the cutter, the elastic member can be stretched to a second state under the action of self elastic force so as to prevent the cutter from moving from the distal end of the mounting seat to the triggerable position.
In one embodiment, the mount has a tissue engaging surface, and the resilient member is capable of collapsing and expanding in a plane of movement that is non-parallel to the tissue engaging surface to effect switching between the first and second states.
In one embodiment, the elastic member is connected to the mounting base.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the nail bin top wall, the two nail bin side walls are arranged on two opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is arranged opposite to the nail bin top wall, a first end of the elastic piece is connected with the protection plate, a second end of the elastic piece contracts towards the protection plate in a first state, and a second end of the elastic piece stretches towards the nail bin top wall in a second state.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the nail bin top wall, the two nail bin side walls are arranged on two opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is opposite to the nail bin top wall, a first end of the elastic piece is connected with the nail bin top wall, a second end of the elastic piece contracts towards the nail bin top wall in a first state, and a second end of the elastic piece stretches towards the protection plate in a second state.
In one embodiment, the mounting seat comprises a nail bin plate and a protection plate, the nail bin plate is provided with a nail bin top wall and two nail bin side walls, the mounting seat is positioned on the opposite sides of the nail bin top wall, the two nail bin side walls are arranged on the opposite sides of the nail bin top wall and extend along the axial direction of the mounting seat, the protection plate is connected with the nail bin side walls and is opposite to the nail bin top wall, a first end of the elastic piece is connected with one of the nail bin side walls, a second end of the elastic piece is contracted towards the nail bin side wall where the first end is located in a first state, and the second end of the elastic piece is stretched towards the nail bin side wall far away from the first end in a second state.
In one embodiment, the first end of the elastic member is connected to the cutter, the second end of the elastic member is contracted toward the cutter in the first state, and the second end of the elastic member is extended away from the cutter in the second state.
In one embodiment, the elastic member is configured as a spring or a leaf spring.
In one embodiment, the cutter blocking member is rotatably disposed, and when the transmission mechanism drives the cutter to move from the cocked position to the distal end of the mounting seat, the cutter blocking member can be driven to rotate relative to the mounting seat, so that the cutter blocking member is switched from the first state to the second state.
In a third aspect, an embodiment provides a surgical instrument comprising:
A handle assembly;
a barrel assembly, the proximal end of the barrel assembly being connected to the handle assembly, the barrel assembly including a transmission mechanism;
The gun barrel assembly comprises a gun barrel assembly, an actuator assembly, a mounting cavity, a first clamping jaw, a second clamping jaw, a first clamping jaw and a second clamping jaw, wherein the distal end of the gun barrel assembly is connected with the actuator assembly, the actuator assembly comprises a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are movably connected, and the first clamping jaw and the second clamping jaw can move relatively to realize closing and opening;
The nail bin assembly is arranged in the mounting cavity and comprises a mounting seat, a nail pushing piece and a cutting knife, the mounting seat is provided with a plurality of mounting positions for mounting the stitching nails, the nail pushing piece and the cutting knife are movably arranged on the mounting seat, the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat, and the proximal end of the mounting seat is provided with a cocking position;
the clamping piece is provided with a connecting end and a free end, the connecting end of the clamping piece is connected with one of the nail bin assembly and the transmission mechanism, and the other one of the nail bin assembly and the transmission mechanism is provided with a clamping part;
A blocking knife member switchable from a first state in which the blocking knife is permitted to move from a cocked position to a distal end of the mount, to a second state in which the blocking knife is configured to prevent movement of the cutting knife to the cocked position;
The transmission mechanism can be matched with the cutting knife at the cocked position, when the cutting knife is at the cocked position, the transmission mechanism is allowed to drive the cutting knife at the cocked position to move from the proximal end of the mounting seat to the distal end of the mounting seat, and after the cutting knife leaves the cocked position, the knife blocking piece is switched from a first state to a second state.
In a fourth aspect, an embodiment provides a staple cartridge assembly comprising:
the mounting seat is provided with a plurality of mounting positions for mounting the stitching nails;
The nail pushing piece is movably arranged on the mounting seat, and the proximal end of the mounting seat is provided with a cocking position;
the cutting knife is movably arranged on the mounting seat, and the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat;
The free end of the clamping piece can move close to and away from the plane where the tissue joint surface on the mounting seat is located so as to realize clamping and releasing clamping with the clamping part of the transmission mechanism on the surgical instrument;
The cutter blocking piece can be switched from a first state to a second state, the cutter blocking piece allows the cutter to move from a cocked position to the far end of the mounting seat in the first state, the cutter blocking piece is used for preventing the cutter from moving to the cocked position in the second state, when the cutter is located at the cocked position, the transmission mechanism of the surgical instrument is allowed to drive the cutter located at the cocked position to move from the near end of the mounting seat to the far end of the mounting seat, and after the cutter leaves the cocked position, the cutter blocking piece is switched from the first state to the second state.
In a fifth aspect, an embodiment provides a surgical instrument comprising:
A handle assembly;
a barrel assembly, the proximal end of the barrel assembly being connected to the handle assembly, the barrel assembly including a transmission mechanism;
The gun barrel assembly comprises a gun barrel assembly, an actuator assembly, a mounting cavity, a first clamping jaw, a second clamping jaw, a first clamping jaw and a second clamping jaw, wherein the distal end of the gun barrel assembly is connected with the actuator assembly, the actuator assembly comprises a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are movably connected, and the first clamping jaw and the second clamping jaw can move relatively to realize closing and opening;
The nail bin assembly is arranged in the mounting cavity and comprises a mounting seat, a nail pushing piece and a cutting knife, the mounting seat is provided with a plurality of mounting positions for mounting the staples, the nail pushing piece and the cutting knife are movably arranged on the mounting seat, and the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat;
The transmission mechanism is used for being matched with the cutting knife, and the transmission mechanism can only apply the thrust from the proximal end of the mounting seat to the distal end of the mounting seat to the cutting knife in the direction of the connecting line of the proximal end and the distal end of the mounting seat.
In a sixth aspect, an embodiment provides a surgical instrument comprising:
A handle assembly;
a barrel assembly, the proximal end of the barrel assembly being connected to the handle assembly, the barrel assembly including a transmission mechanism;
The gun barrel assembly comprises a gun barrel assembly, an actuator assembly, a mounting cavity, a first clamping jaw, a second clamping jaw, a first clamping jaw and a second clamping jaw, wherein the distal end of the gun barrel assembly is connected with the actuator assembly, the actuator assembly comprises a first clamping jaw and a second clamping jaw, the first clamping jaw and the second clamping jaw are movably connected, and the first clamping jaw and the second clamping jaw can move relatively to realize closing and opening;
The nail bin assembly is arranged in the mounting cavity and comprises a mounting seat, a nail pushing piece and a cutting knife, the mounting seat is provided with a plurality of mounting positions for mounting the staples, the nail pushing piece and the cutting knife are movably arranged on the mounting seat, and the nail pushing piece and the cutting knife can move from the proximal end to the distal end of the mounting seat;
The transmission mechanism can move between the proximal end of the mounting seat and the distal end of the mounting seat, when the transmission mechanism moves from the proximal end of the mounting seat to the distal end of the mounting seat, the transmission mechanism is matched with the cutting knife and drives the cutting knife to move from the proximal end of the mounting seat to the distal end of the mounting seat, and when the transmission mechanism moves from the distal end of the mounting seat to the proximal end of the mounting seat, the transmission mechanism is separated from the cutting knife.
Advantageous effectsThe surgical instrument and cartridge assembly according to the above-described embodiments includes a handle assembly, a barrel assembly, a cartridge assembly, an actuator assembly, and a knife blocking member. The proximal end of the barrel assembly is connected to the handle assembly, and the barrel assembly includes a drive mechanism. The distal end of the gun barrel component is connected with the actuator component, the actuator component comprises a first jaw and a second jaw, the first jaw is movably connected with the second jaw, and the first jaw and the second jaw can move relatively to realize closing and opening. A mounting cavity is formed between the first jaw and the second jaw. The nail bin assembly is used for being arranged in the installation cavity, the nail bin assembly comprises an installation seat, a nail pushing piece and a cutting knife, the installation seat is provided with a plurality of installation positions for installing the stitching nails, the nail pushing piece and the cutting knife are movably arranged on the installation seat, the nail pushing piece and the cutting knife can move from the proximal end of the installation seat to the distal end, and the proximal end of the installation seat is provided with a triggerable position. The blocking knife member is switchable from a first state in which the blocking knife member allows movement of the cutting knife from the cocked position to the distal end of the mount to a second state in which the blocking knife member is operable to inhibit movement of the cutting knife to the cocked position. The transmission mechanism can be matched with the cutting knife at the cocked position, when the cutting knife is at the cocked position, the transmission mechanism is allowed to drive the cutting knife at the cocked position to move from the proximal end of the mounting seat to the distal end of the mounting seat, and the knife blocking piece is switched from the first state to the second state in the process of moving the cutting knife from the proximal end to the distal end. On the one hand, because the cutter blocking piece is added, in the process that the transmission mechanism drives the cutter to move from the proximal end to the distal end, the cutter blocking piece is switched from the first state to the second state so as to prevent the cutter from returning to the cocked position, and the cutter cannot be cocked for the second time. Compared with the traditional safety device, the safety device has the advantages that the motion of the transmission mechanism is prevented without a safety clamping piece with a complex structure, the cutting knife is prevented from being reset to the position capable of being triggered only by the knife blocking piece, the function of preventing the cutting knife from being triggered secondarily can be achieved, fewer parts participate in the motion, and accordingly the reliability of surgical instruments and nail bin assemblies is improved. On the other hand, when changing the nail storehouse subassembly, can realize the change to the cutting knife in the nail storehouse subassembly in step, avoid cutting knife used repeatedly to cause the sharpness reduction of cutting knife to be favorable to promoting operation quality.
DrawingsFIG. 1 is a schematic view of a surgical instrument according to one embodiment of the present application;
FIG. 2 is a schematic illustration of the structure of an actuator assembly, cartridge assembly and drive mechanism in accordance with one embodiment of the present application;
FIG. 3 is a cross-sectional view of an actuator assembly, cartridge assembly and drive mechanism in one embodiment of the present application;
FIG. 4 is an enlarged view of the application at A in FIG. 3;
FIG. 5 is a schematic view of the structure of a cartridge assembly according to one embodiment of the present application;
FIG. 6 is an exploded view of a cartridge assembly according to one embodiment of the present application;
FIG. 7 is a cross-sectional view of the proximal end of the cartridge assembly with the knife blocking member in a first state in accordance with one embodiment of the present application;
FIG. 8 is a cross-sectional view of the proximal end of the cartridge assembly with the knife blocking member in a second state in accordance with one embodiment of the present application;
FIG. 9 is a schematic view of a cartridge assembly in a first state with a knife blocking member according to a second embodiment of the present application;
FIG. 10 is a schematic view of a cartridge assembly in a second state with a knife blocking member according to a second embodiment of the present application;
FIG. 11 is a schematic view of the construction of a guard plate and a knife blocking member in accordance with a second embodiment of the application;
FIG. 12 is a cross-sectional view of the proximal ends of the actuator assembly and cartridge assembly with the knife blocking member in a first state in accordance with a third embodiment of the present application;
FIG. 13 is a cross-sectional view of the proximal ends of the actuator assembly and cartridge assembly with the knife blocking member in a second state in accordance with a third embodiment of the present application;
FIG. 14 is a cross-sectional view of the proximal ends of the actuator assembly and cartridge assembly with the knife blocking member in a first state in accordance with a fourth embodiment of the present application;
FIG. 15 is a cross-sectional view of the proximal ends of the actuator assembly and cartridge assembly with the knife blocking member in a second state in accordance with a fourth embodiment of the present application;
FIG. 16 is a cross-sectional view of the proximal end of the effector assembly and cartridge assembly with the cutting blade in a cocked position in accordance with a fifth embodiment of the present application;
FIG. 17 is a cross-sectional view of the proximal end of the actuator assembly and cartridge assembly with the knife and knife cocked and in contact with the knife guard in a fifth embodiment of the application;
FIG. 18 is a cross-sectional view of the proximal ends of the actuator assembly and cartridge assembly with the knife pusher block knife switched to the second state in a fifth embodiment of the application;
FIG. 19 is a cross-sectional view of the proximal end of the actuator assembly and cartridge assembly with the cutting blade retracted and blocked by the blocking blade in a fifth embodiment of the present application;
FIG. 20 is a schematic view of a cutter and staple pusher without a fastener according to a sixth embodiment of the present application;
FIG. 21 is a schematic view of a transmission mechanism in a sixth embodiment of the application in preparation for engagement with a cutting blade in a cocked orientation;
FIG. 22 is a schematic view of a transmission mechanism of a sixth embodiment of the present application in combination with a cutting blade in a cocked position;
FIG. 23 is a schematic view of a sixth embodiment of the present application with the drive mechanism retracted and separated from the fired cutting blade;
Reference numerals 100, handle assembly, 110, fixed handle, 120, trigger, 200, barrel assembly, 210, transmission mechanism, 211, first unlocking part, 300, actuator assembly, 310, first jaw, 311, holding groove, 320, second jaw, 330, locking part, 400, cartridge assembly, 410, mounting seat, 411, tissue bonding surface, 412, cartridge plate, 4121, cartridge top wall, 4122, cartridge side wall, 413, protection plate, 414, knife blocking groove, 420, staple pushing member, 430, cutting knife, 431, second unlocking part, 500, knife blocking member, 510, elastic member, 520, knife blocking protrusion, 600, buckle member, 700, clamping part.
Embodiments of the inventionThe application will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, related operations of the present application have not been shown or described in the specification in order to avoid obscuring the core portions of the present application, and may be unnecessary to persons skilled in the art from a detailed description of the related operations, which may be presented in the description and general knowledge of one skilled in the art.
Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.
The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated.
The stapler is a surgical instrument commonly used in minimally invasive surgery, and referring to fig. 1, the stapler generally includes a handle assembly 100, a barrel assembly 200, and an actuator assembly 300, the barrel assembly 200 including a closure drive train and a firing drive train, the handle assembly 100 including a stationary handle 110 and at least one trigger 120.
In operating the stapler, an operator may grasp the stationary handle 110 and extend the effector assembly 300 through the elongate barrel assembly 200 and into a focal site within the body. The closure drive chain is then triggered by the trigger 120 to close the jaws of the actuator assembly 300 and grip at a specific location near the lesion. The firing drive train is then triggered by the trigger 120 to cause the cutting blade 430 within the effector assembly 300 to sever tissue and simultaneously sever tissue stapled by the staples within the effector assembly 300. In other embodiments, the closing and firing may be operated in other ways, such as where two triggers 120 are operated to perform closing and firing, respectively, or in an electric closing and firing scheme.
The "distal end" in this embodiment refers to the end that is remote from the operator when the surgical instrument is operated, and the "proximal end" refers to the end that is close to the operator when the surgical instrument is operated. The "axial" in this embodiment refers to the direction of the line connecting the center of the distal end and the center of the proximal end, and the "radial" refers to the direction perpendicular to the axial direction.
Referring to fig. 1-23, the present embodiment provides a surgical instrument.
The surgical instrument includes a handle assembly 100, a barrel assembly 200, a cartridge assembly 400, an actuator assembly 300, and a knife guard 500. The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of barrel assembly 200 is connected to an actuator assembly 300, and actuator assembly 300 includes a first jaw 310 and a second jaw 320, with first jaw 310 movably connected to second jaw 320, and with first jaw 310 and second jaw 320 being capable of relative movement to effect closure and opening. A mounting cavity is formed between the first jaw 310 and the second jaw 320. The cartridge assembly 400 is configured to be disposed within the mounting cavity, the cartridge assembly 400 includes a mounting base 410, a staple pusher 420 and a cutter 430, the mounting base 410 having a plurality of mounting locations for mounting staples, the staple pusher 420 and the cutter 430 being movably disposed on the mounting base 410, the staple pusher 420 and the cutter 430 being movable from a proximal end of the mounting base 410 to a distal end, the proximal end of the mounting base 410 having a cockable position. The blocking knife 500 is switchable from a first state in which the blocking knife 500 allows movement of the cutting knife 430 from the cocked position to the distal end of the mount 410 to a second state in which the blocking knife 500 is operable to prevent movement of the cutting knife 430 to the cocked position. The transmission mechanism 210 is capable of cooperating with the cutting blade 430 in the cocked position, allowing the transmission mechanism 210 to move the cutting blade 430 in the cocked position from the proximal end of the mounting base 410 to the distal end of the mounting base 410 when the cutting blade 430 is in the cocked position, and switching the blade blocking member 500 from the first state to the second state during the movement of the cutting blade 430 from the proximal end to the distal end.
On the one hand, due to the addition of the knife blocking member 500, in the process that the transmission mechanism 210 drives the cutter 430 to move from the proximal end to the distal end, the knife blocking member 500 is switched from the first state to the second state, so as to prevent the cutter 430 from returning to the cocked position, so that the cutter 430 cannot be cocked for a second time. Compared with the traditional safety device, the safety device has the advantages that the transmission mechanism 210 does not need to be prevented from moving through the safety clamping piece with a complex structure, the function of preventing the cutting knife 430 from being secondarily fired can be realized only by preventing the cutting knife 430 from being reset to the triggerable position through the knife blocking piece 500, and fewer parts participate in movement, so that the reliability of the surgical instrument and the nail cartridge assembly 400 is improved. On the other hand, when the nail bin assembly 400 is replaced, the replacement of the cutting knife 430 in the nail bin assembly 400 can be synchronously realized, so that the sharpness of the cutting knife 430 is prevented from being reduced due to the repeated use of the cutting knife 430, and the surgical quality is improved.
It should be noted that, the triggerable position of the mounting base 410 refers to an initial position of the unfired cutter 430 on the mounting base 410 at the proximal end of the mounting base 410. The surgical instrument may or may not include a cartridge assembly 400, i.e., when the surgical instrument includes a cartridge assembly 400, the cartridge assembly 400 is considered to be part of the surgical instrument. When the surgical instrument does not include cartridge assembly 400, cartridge assembly 400 is considered an accessory or consumable for the surgical instrument.
In another aspect, the present embodiment also provides a staple cartridge assembly 400.
Referring to fig. 2-8, the cartridge assembly 400 includes a mounting block 410, a staple pusher 420, a cutting knife 430, and a knife guard 500.
The mount 410 has a plurality of mounting locations for mounting staples, and the proximal end of the mount 410 has a cockable position. The nail pusher 420 is movably disposed on the mounting base 410. The cutting blade 430 is movably disposed on the mounting block 410, and both the staple pusher 420 and the cutting blade 430 are capable of moving distally from the proximal end of the mounting block 410. The blocking knife 500 is switchable from a first state in which the blocking knife 500 allows movement of the cutting knife 430 from the cocked position to the distal end of the mount 410 to a second state in which the blocking knife 500 is operable to prevent movement of the cutting knife 430 to the cocked position. When the cutting blade 430 is in the cocked position, the transmission mechanism 210 of the surgical instrument is allowed to drive the cutting blade 430 in the cocked position from the proximal end of the mount 410 to the distal end of the mount 410, and the blade guard 500 is switched from the first state to the second state during the proximal-to-distal movement of the cutting blade 430.
Referring to fig. 5-8, in one embodiment, the cutter blocking member 500 is configured as an elastic member 510, when the cutter 430 is located at the cocked position, the elastic member 510 can be contracted to the first state under the pressure of the cutter 430 or the staple pusher 420, and after the cutter 430 is cocked by the driving structure, the elastic member 510 can be stretched to the second state under the action of the self elastic force to prevent the cutter 430 from moving from the distal end of the mounting seat 410 to the cocked position.
When the elastic member 510 is selected as the blade blocking member 500, the elastic member 510 is switched between the first state and the second state by the contraction of the elastic member 510 under the action of external force and the expansion of the elastic member under the action of self elastic force. Specifically, in an actual application scenario, after the transmission mechanism 210 fires the cutter 430, the cutter 430 or the staple pusher 420 releases the pressure on the cutter blocking member 500 due to its own displacement, so that the cutter blocking member 500 can be automatically switched from the first state to the second state under the action of its own elastic force, and the operation steps required for switching the cutter blocking member 500 are reduced by fully utilizing the own elastic force of the cutter blocking member 500.
It should be noted that, the meaning of the first state and the second state of the blade guard 500 is not limited to the extended state and the contracted state of the elastic member 510, and in other implementations, the blade guard 500 may be a rigid member that is movably disposed, and the first state and the second state of the blade guard 500 are defined by driving the rigid member to move to different positions or attitudes.
Referring to fig. 5-8, in one embodiment, the mount 410 has a tissue engaging surface 411 and the resilient member 510 is capable of retracting and extending in a plane of motion that is non-parallel to the tissue engaging surface 411 to effect switching between the first and second states.
Since the movable plane of the elastic member 510 is not parallel to the tissue-engaging surface 411, the elastic member 510 changes the distance between the elastic member 510 and the cutter 430 and the staple pusher 420 in the direction perpendicular to the tissue-engaging surface 411 when the elastic member 510 is contracted and expanded, thereby realizing the switching of the elastic member 510 between the first state allowing the cutter 430 to retract to the cocked position and the second state preventing the cutter 430 from retracting to the cocked position.
The tissue-engaging surface 411 of the mount 410 refers to a surface of the mount 410 that contacts the clamped tissue when the tissue is clamped. It will be appreciated that in performing tissue stapling, staples are pushed out of the tissue engaging face 411 of the mount 410 to effect stapling of the tissue.
Referring to fig. 5-8, in one embodiment, the plane of movement of the resilient member 510 is perpendicular to the tissue engaging surface 411.
When the elastic member 510 is perpendicular to the tissue engagement surface 411, the elastic member 510 can be switched between the first state and the second state with a minimum amount of deformation. Of course, in other embodiments, the plane of movement of the resilient member 510 may be at an angle of 30, 60, or other suitable angle to the tissue engaging surface 411.
Referring to fig. 5-11, in one embodiment, a resilient member 510 is coupled to the mounting base 410.
Because the elastic member 510 is connected to the mounting base 410, when an operator installs and removes the mounting base 410 from the actuator assembly 300, the installation and the removal of the elastic member 510 can be simultaneously achieved, thereby being beneficial to reducing the structural complexity of the actuator assembly 300 and reducing the steps of the operator in the assembly and disassembly.
Specifically, the resilient member 510 may be attached to the mount 410 at various locations.
For example, referring to fig. 5-8, in a first connection scheme, the elastic member 510 is connected to the top of the mounting base 410, the mounting base 410 includes a cartridge plate 412 and a protection plate 413, the cartridge plate 412 has a cartridge top wall 4121 and two cartridge side walls 4122, the mounting position is located on the cartridge top wall 4121, the two cartridge side walls 4122 are disposed on opposite sides of the cartridge top wall 4121 and extend along the axial direction of the mounting base 410, and the protection plate 413 is connected to the cartridge side walls 4122 and is disposed opposite to the cartridge top wall 4121. The first end of the elastic member 510 is connected to the cartridge top wall 4121, the second end of the elastic member 510 is contracted toward the cartridge top wall 4121 in the first state, and the second end of the elastic member 510 is expanded toward the protection plate 413 in the second state.
When the cutter 430 is in the cocked position, the second end of the elastic member 510 is retracted toward the cartridge top wall 4121 by the pressure of the cutter 430 or the staple pusher 420, so that the elastic member 510 is switched to the first state. When the cutter 430 is fired, the second end of the elastic member 510 is stretched toward the protection plate 413 by the elastic force thereof, so that the elastic member 510 is switched to the second state. Specifically, in this embodiment, the elastic member 510 is a spring, and in other embodiments, the elastic member 510 may be a spring plate.
For another example, referring to fig. 9-11, in a second connection scheme, an elastic member 510 is connected to the bottom of a mounting seat 410, the mounting seat 410 includes a cartridge plate 412 and a protection plate 413, the cartridge plate 412 has a cartridge top wall 4121 and two cartridge bottoms, the mounting positions are located on the cartridge top wall 4121, two cartridge side walls 4122 are disposed on opposite sides of the cartridge top wall 4121 and extend along the axial direction of the mounting seat 410, and the protection plate 413 is connected to the cartridge side walls 4122 and is disposed opposite to the cartridge top wall 4121. The first end of the elastic member 510 is connected to the protection plate 413, and the second end of the elastic member 510 is contracted toward the protection plate 413 in the first state and the second end of the elastic member 510 is expanded toward the cartridge top wall 4121 in the second state.
When the cutter 430 is located at the cocked position, the second end of the elastic member 510 is contracted towards the protection plate 413 under the pressure of the cutter 430 or the staple pusher 420, so that the elastic member 510 is switched to the first state. When the cutter 430 is fired, the second end of the resilient member 510 is stretched toward the cartridge top wall 4121 by its own elastic force, such that the resilient member 510 is switched to the second state. Specifically, in this embodiment, the elastic member 510 is an elastic sheet, and two opposite sides of the proximal end of the protection plate are respectively provided with an elastic sheet.
Also for example, in the third connection scheme, the elastic member 510 is connected to a side portion of the mounting seat 410, the mounting seat 410 includes a cartridge plate 412 and a protection plate 413, the cartridge plate 412 has a cartridge top wall 4121 and two cartridge side walls 4122, the mounting position is located on the cartridge top wall 4121, the two cartridge side walls 4122 are disposed on opposite sides of the cartridge top wall 4121 and extend along an axial direction of the mounting seat 410, and the protection plate 413 is connected to the cartridge side walls 4122 and is disposed opposite to the cartridge top wall 4121. The first end of the elastic member 510 is connected to one of the cartridge side walls 4122, the second end of the elastic member 510 is contracted toward the cartridge side wall 4122 where the first end is located in the first state, and the second end of the elastic member 510 is expanded toward the cartridge side wall 4122 away from the first end in the second state.
When the cutter 430 is located at the cocked position, the second end of the elastic member 510 is contracted towards the side wall 4122 of the cartridge where the first end is located under the pressure of the cutter 430 or the staple pusher 420, so that the elastic member 510 is switched to the first state. When the cutter 430 is fired, the second end of the resilient member 510 expands away from the cartridge sidewall 4122 of the first end under its own spring force, such that the resilient member 510 switches to the second state.
Specifically, the connection between the elastic member 510 and the cartridge top wall 4121, the cartridge side wall 4122 or the protection plate 413 of the mounting base 410 may be an adhesive, a clamping connection, a welding connection, a threaded connection or other suitable connection. The elastic member 510 may be a spring, a spring plate, an elastic block, or other suitable elastic structure.
Of course, in other embodiments, the elastic member 510 may not be connected to the mounting base 410, but may be connected to the actuator assembly 300, the cutting blade 430, the staple pusher 420, or the like.
For example, referring to fig. 12 and 13, in one embodiment, a first end of the elastic member 510 is connected to the cutter 430, a second end of the elastic member 510 is contracted toward the cutter 430 in a first state, and a second end of the elastic member 510 is stretched away from the cutter 430 in a second state.
When the cutter 430 is located at the cocked position, the second end of the elastic member 510 is contracted towards the cutter 430 by the extrusion force, so that the elastic member 510 is switched to the first state. When the cutter 430 is fired, the second end of the elastic member 510 is stretched away from the cutter 430 by the elastic force thereof, so that the elastic member 510 is switched to the second state. Specifically, when the cutting blade 430 is in the firing position, the elastic member 510 may be maintained in the first state by the compressive force of the inner wall of the mounting base 410, or may be maintained in the first state by the compressive force of the actuator assembly 300 or other components.
For another example, referring to fig. 14 and 15, in one embodiment, a first end of the elastic member 510 is connected to the first jaw 310 or the second jaw 320 of the actuator assembly 300, and a second end of the elastic member 510 is contracted toward the first jaw 310 or the second jaw 320 where the first end is located in the first state, and a second end of the elastic member 510 is expanded toward the mounting seat 410 in the second state.
When the cutter 430 is located at the triggerable position, the second end of the elastic member 510 is retracted toward the first jaw 310 or the second jaw 320 where the first end is located under the action of the pressing force of the cutter 430 or the staple pusher 420, so that the elastic member 510 is switched to the first state. When the cutter 430 is fired, the second end of the elastic member 510 stretches toward the mounting seat 410 under the action of the elastic force thereof, so that the elastic member 510 is switched to the second state.
Specifically, referring to fig. 14 and 15, the first jaw 310 has a receiving groove 311, the elastic member 510 is disposed in the receiving groove 311, and referring to fig. 14, when the cutter 430 is in the cocked position, the elastic member 510 is retracted and received in the receiving groove 311 under the pressure of the staple pushing member 420 to be kept in the first state. Referring to fig. 15, after the cutter 430 is fired, the elastic member 510 extends out of the accommodating groove 311 under the action of its own elastic force to switch to the second state. Of course, in other embodiments, the resilient member 510 can also be coupled to the second jaw 320.
It should be noted that, the selection of the elastic member 510 for the blade guard 500 has the advantages of simple structure and automatic switching of the state by the self elastic force, but it does not indicate that the blade guard 500 can only select the elastic member 510. In other embodiments, instead of the elastic member 510, the shutter 500 may be a movable rigid member, and the shutter 500 may be switched between the first state and the second state by driving the rigid member to move to different positions or postures.
For example, referring to fig. 16-19, in one embodiment, the blade guard 500 is rotatably disposed, and the transmission mechanism 210 drives the cutter 430 to move from the cockable position to the distal end of the mount 410, so that the blade guard 500 can be driven to rotate relative to the mount 410, so that the blade guard 500 is switched from the first state to the second state, and the state is switched by the rotation of the blade guard 500.
Referring to fig. 16-19, in one embodiment, a knife blocking protrusion 520 is disposed at an end of the knife blocking member 500 facing the knife blocking protrusion 520, a knife blocking groove 414 matched with the knife blocking protrusion 520 is disposed on the mounting base 410, and when the cutting knife 430 is fired, a portion of the cutting knife 430 contacting with the knife blocking member 500 drives the knife blocking member 500 to rotate relative to the mounting base 410, so that the knife blocking protrusion 520 is clamped with the knife blocking groove 414, and the knife 430 is prevented from retracting to the cockable position by the other end of the knife blocking member 500. In other embodiments, the manner of engaging the blade guard 500 with the mounting base 410 is not limited to a snap fit, for example, the blade guard 500 may be magnetically engaged or bonded with the mounting base 410.
Of course, in other embodiments, the stiffening member is not limited to a rotational arrangement, for example, the stiffening member may be slidably disposed along an inclined ramp, with sliding displacement of the stiffening member on the ramp to a state that allows and prevents retraction of the cutting blade 430 to the cocked position.
Referring to fig. 2-4, in one embodiment, the actuator assembly 300 has a locking portion 330, the locking portion 330 being configured to lock with the actuator 210 to prevent axial movement of the actuator 210 along the actuator assembly 300. The transmission mechanism 210 has a first unlocking portion 211, and the cutter 430 has a second unlocking portion 431. When the cutter 430 is in the cocked position, the first unlocking portion 211 of the transmission mechanism 210 can cooperate with the second unlocking portion 431 of the cutter 430 to unlock the locking portion 330 from the transmission mechanism 210.
On the one hand, when the locking portion 330 on the actuator assembly 300 is utilized to lock the transmission mechanism 210, compared with the traditional technical scheme, the safety function can be realized by only adding features on the existing parts, without adding the safety clamping piece with complex structure and the spring driving structure, thereby being beneficial to improving the reliability of the safety function and avoiding the risk that the safety clamping piece falls into a human body after being invalid. On the other hand, when the cutter 430 is located at the cocked position, the first unlocking portion 211 on the transmission mechanism 210 and the second unlocking portion 431 on the cartridge module 400 are utilized to unlock the transmission mechanism 210, so as to ensure that the cutter 430 located at the cocked position can be cocked by the transmission mechanism 210.
It is to be appreciated that the time for the blade guard 500 to switch from the first state to the second state is not limited to the process of moving the cutting blade 430 from the proximal end to the distal end, as long as the blade guard 500 can switch from the first state to the second state after the cutting blade 430 leaves the cockable position.
For example, referring to FIGS. 1-8, the present embodiment also provides a surgical instrument.
Referring to fig. 1-8, the surgical instrument includes a handle assembly 100, a barrel assembly 200, an actuator assembly 300, a cartridge assembly 400, a clasp 600, and a knife guard 500.
The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of barrel assembly 200 is connected to an actuator assembly 300, and actuator assembly 300 includes a first jaw 310 and a second jaw 320, with first jaw 310 movably connected to second jaw 320, and with first jaw 310 and second jaw 320 being capable of relative movement to effect closure and opening. A mounting cavity is formed between the first jaw 310 and the second jaw 320. The cartridge assembly 400 is configured to be disposed within the mounting cavity, the cartridge assembly 400 includes a mounting base 410, a staple pusher 420 and a cutter 430, the mounting base 410 having a plurality of mounting locations for mounting staples, the staple pusher 420 and the cutter 430 being movably disposed on the mounting base 410, the staple pusher 420 and the cutter 430 being movable from a proximal end of the mounting base 410 to a distal end, the proximal end of the mounting base 410 having a cockable position. The fastening member 600 has a connection end and a free end, the connection end of the fastening member 600 is connected to one of the cartridge assembly 400 and the transmission mechanism 210, and the other of the cartridge assembly 400 and the transmission mechanism 210 has a fastening portion 700. The free end of the clip 600 can move toward and away from the plane of the tissue engaging surface 411 on the mounting base 410 to achieve and release the clip from the clip portion 700.
The blocking knife 500 is switchable from a first state in which the blocking knife 500 allows movement of the cutting knife 430 from the cocked position to the distal end of the mount 410 to a second state in which the blocking knife 500 is operable to prevent movement of the cutting knife 430 to the cocked position. The transmission mechanism 210 is capable of cooperating with the cutting blade 430 in the cocked position, allowing the transmission mechanism 210 to move the cutting blade 430 in the cocked position from the proximal end of the mount 410 to the distal end of the mount 410 when the cutting blade 430 is in the cocked position. After the cutting blade 430 is moved from the cocked position, the knife guard 500 switches from the first state to the second state.
On the one hand, due to the addition of the fastener 600 and the clamping portion 700, the fastener 600 can be moved to a plane close to the tissue bonding surface 411 on the mounting seat 410, so as to realize the clamping with the clamping portion 700, and further realize the clamping fit between the cartridge assembly 400 and the transmission mechanism 210. The fastening piece 600 moves to a plane far away from the tissue combining surface 411 on the mounting seat 410, so that the fastening is released from the fastening part 700, and the fastening is released from the nail bin assembly 400 and the transmission mechanism 210, so that the reliability of combining and separating the nail bin assembly 400 and the transmission mechanism 210 is improved. On the other hand, the timing of the switch of the cutter blocking member 500 from the first state to the second state may not be limited to the process of moving the cutter 430 from the proximal end to the distal end, for example, the timing of the change of the state of the cutter blocking member 500 may be when the cutter 430 moves from the distal end to the proximal end and does not reach the cocked position, so long as the cutter 430 is guaranteed to leave the cocked position when the state of the cutter blocking member 500 changes. This facilitates both increasing the flexibility in selection of the timing of the change of state of the fence insert 500 and expanding the number of realizations of the specific structure of the fence insert 500.
Referring to fig. 1-8, the present embodiment further provides a cartridge assembly 400 based on the surgical instrument with the fastener 600 and the clamping portion 700.
Referring to fig. 1-8, the cartridge assembly 400 includes a mounting block 410, a staple pusher 420, a cutting blade 430, a snap fastener 600, and a knife blocking member 500.
Mount 410 has a plurality of mounting locations for mounting staples. The staple pusher 420 is movably disposed on the mounting base 410, and the proximal end of the mounting base 410 has a cockable position. The cutting blade 430 is movably disposed on the mounting block 410, and both the staple pusher 420 and the cutting blade 430 are capable of moving distally from the proximal end of the mounting block 410. The fastener 600 has a connection end and a free end, and the free end of the fastener 600 can move near to and away from a plane where the tissue engaging surface 411 on the mounting base 410 is located, so as to implement the clamping and releasing of the clamping portion 700 of the transmission mechanism 210 on the surgical instrument.
The blocking knife 500 is switchable from a first state in which the blocking knife 500 allows movement of the cutting knife 430 from the cocked position to the distal end of the mount 410 to a second state in which the blocking knife 500 is operable to prevent movement of the cutting knife 430 to the cocked position. When the cutting blade 430 is in the cocked position, the drive mechanism 210 of the surgical instrument is allowed to move the cutting blade 430 in the cocked position from the proximal end of the mount 410 to the distal end of the mount 410. After the cutting blade 430 is moved from the cocked position, the knife guard 500 switches from the first state to the second state.
It will be appreciated that in some embodiments, the cutter 430 may also be prevented from being fired a second time by failing to retract the cutter 430 after it has been moved out of the cocked orientation.
For example, referring to FIGS. 20-23, the present embodiment also provides a surgical instrument.
Referring to fig. 20-23, the surgical instrument includes a handle assembly 100, a barrel assembly 200, an actuator assembly 300, and a cartridge assembly 400.
The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of barrel assembly 200 is connected to an actuator assembly 300, and actuator assembly 300 includes a first jaw 310 and a second jaw 320, with first jaw 310 movably connected to second jaw 320, and with first jaw 310 and second jaw 320 being capable of relative movement to effect closure and opening. A mounting cavity is formed between the first jaw 310 and the second jaw 320.
The cartridge assembly 400 is configured to be disposed within the mounting cavity, the cartridge assembly 400 includes a mounting base 410, a staple pusher 420, and a cutter 430, the mounting base 410 having a plurality of mounting locations for mounting staples, the staple pusher 420 and the cutter 430 being movably disposed on the mounting base 410, the staple pusher 420 and the cutter 430 being movable from a proximal end to a distal end of the mounting base 410. The transmission mechanism 210 is configured to cooperate with the cutter 430, and the transmission mechanism 210 is only capable of applying a pushing force to the cutter 430 from the proximal end of the mount 410 to the distal end of the mount 410 in the direction of the proximal and distal connection of the mount 410.
Because the transmission mechanism 210 can only apply a pushing force from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410 to the cutter 430 in the direction of the connection between the proximal end and the distal end of the mounting seat 410, the transmission mechanism 210 can only drive the cutter 430 to move from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410, but cannot drive the cutter 430 to move from the distal end of the mounting seat 410 to the proximal end, so that the cutter 430 cannot be retracted to the cockable position, and the secondary firing of the cutter 430 by the transmission mechanism 210 is avoided.
For another example, referring to FIGS. 20-23, the present embodiment also provides a surgical instrument.
Referring to fig. 20-23, the surgical instrument includes a handle assembly 100, a barrel assembly 200, an actuator assembly 300, and a cartridge assembly 400.
The proximal end of the barrel assembly 200 is connected to the handle assembly 100, and the barrel assembly 200 includes a transmission mechanism 210. The distal end of barrel assembly 200 is connected to an actuator assembly 300, and actuator assembly 300 includes a first jaw 310 and a second jaw 320, with first jaw 310 movably connected to second jaw 320, and with first jaw 310 and second jaw 320 being capable of relative movement to effect closure and opening. A mounting cavity is formed between the first jaw 310 and the second jaw 320. The cartridge assembly 400 is configured to be disposed within the mounting cavity, the cartridge assembly 400 includes a mounting base 410, a staple pusher 420, and a cutter 430, the mounting base 410 having a plurality of mounting locations for mounting staples, the staple pusher 420 and the cutter 430 being movably disposed on the mounting base 410, the staple pusher 420 and the cutter 430 being movable from a proximal end to a distal end of the mounting base 410.
The transmission mechanism 210 is capable of moving between the proximal end of the mount 410 and the distal end of the mount 410, and when the transmission mechanism 210 moves from the proximal end of the mount 410 to the distal end of the mount 410, the transmission mechanism 210 cooperates with the cutting blade 430 and drives the cutting blade 430 to move from the proximal end of the mount 410 to the distal end of the mount 410. The actuator 210 is decoupled from the cutting blade 430 as the actuator 210 moves from the distal end of the mount 410 to the proximal end of the mount 410.
So that the transmission mechanism 210 can only drive the cutter 430 to move from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410, and when the transmission mechanism 210 moves to the proximal end of the mounting seat 410, the transmission mechanism 210 is separated from the cutter 430, so that the cutter 430 cannot be driven to move to the proximal end of the mounting seat 410.
Referring to fig. 20-23, it can be appreciated that the above two schemes of limiting the direction of the force applied by the transmission mechanism 210 to the cutter 430 and limiting the timing of the engagement and disengagement of the transmission mechanism 210 with the cutter 430 can be used alone or in combination.
For example, referring to fig. 20-23, when the two schemes are combined, the transmission mechanism 210 has a first unlocking portion 211, and the cutter 430 has a second unlocking portion 431. As can be seen from comparison of fig. 4-8, the fastener 600 and the engaging portion 700 in fig. 4-8 are not disposed between the transmission mechanism 210 and the cutter 430. When the transmission mechanism 210 moves from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410, the first unlocking portion 211 is matched with the second unlocking portion 431, and the transmission mechanism 210 applies a pushing force from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410 to the cutter 430, so that the cutter 430 is driven to move from the proximal end of the mounting seat 410 to the distal end of the mounting seat 410. When the transmission mechanism 210 moves from the distal end of the mount 410 to the proximal end of the mount 410, the first unlocking portion 211 is separated from the second unlocking portion 431, and the transmission mechanism 210 cannot apply a pulling force from the distal end of the mount 410 to the proximal end of the mount 410 to the cutter 430, so that the cutter 430 cannot retract to the cockable position.
It should be noted that, the timing of separating the transmission mechanism 210 from the cutter 430 may be directly separated when the transmission mechanism 210 moves toward the proximal end of the mounting seat 410, or may be separated from the cutter 430 after the transmission mechanism 210 drives the cutter 430 to move toward the proximal end of the mounting seat 410 by a certain distance, so long as the cutter 430 is ensured not to move to the cocked position. For example, the transmission mechanism 210 is connected to the cutter 430 through a pull-back protrusion mechanism and a pull-back groove, where the pull-back protrusion mechanism is made of a material that is easy to deform, and when the transmission mechanism 210 moves towards the proximal end of the mounting seat 410, the pull-back protrusion mechanism is clamped with the pull-back groove, so as to drive the cutter 430 to move towards the proximal end of the mounting seat 410 for a certain distance. And, the pull-back protrusion is gradually deformed during the proximal movement to the mounting seat 410, which eventually causes the pull-back protrusion to be separated from the pull-back recess, so that the cutter 430 cannot continue to move to the cocked position.
The foregoing description of the invention has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the invention pertains, based on the idea of the invention.