CN112674823B

Movatterモバイル変換

Info

Publication number: CN112674823B
Application number: CN202011538076.1A
Authority: CN
Inventors: 单腾
Original assignee: Suzhou Tianchen International Medical Technology Co Ltd
Current assignee: Suzhou Tianchen International Medical Technology Co Ltd
Priority date: 2020-12-23
Filing date: 2020-12-23
Publication date: 2022-03-08
Anticipated expiration: 2040-12-23
Also published as: CN112674823A

Abstract

本发明提供了一种击发机构及吻合器，所述击发机构包括：击发块，所述击发块的近端侧设置有卡槽，所述卡槽的两侧壁分别形成一夹持臂；切刀组件，位于所述击发块的近端侧，所述切刀组件的远端侧设置有第一配合部，所述第一配合部至少部分进入所述卡槽中，以使得所述夹持臂分别位于所述第一配合部的左右两侧。本发明通过击发块的卡槽和切刀组件的第一配合部的配合，由击发块的夹持臂实现对切刀组件左右方向运动的限制，保持在击发过程中，切刀组件沿吻合器轴向运动而减少钉砧相对于钉仓组件的左右偏摆，从而保持切刀组件运动的稳定性，提高了手术效果。

The present invention provides a firing mechanism and a stapler. The firing mechanism comprises: a firing block, a clipping slot is provided on the proximal end side of the firing block, and two side walls of the clipping slot respectively form a clamping arm; a knife assembly, located on the proximal end side of the firing block, a first matching part is provided at the distal end side of the cutting knife assembly, and the first matching part at least partially enters into the snap groove, so that the clamping The arms are respectively located on the left and right sides of the first matching portion. In the present invention, through the cooperation between the slot of the firing block and the first matching part of the cutter assembly, the clamping arm of the firing block realizes the restriction of the left and right movement of the cutter assembly. During the firing process, the cutter assembly moves along the stapler. The axial movement reduces the left and right deflection of the nail anvil relative to the nail cartridge assembly, thereby maintaining the movement stability of the cutter assembly and improving the surgical effect.

Description

Firing mechanism and anastomat

Technical Field

The invention relates to the technical field of medical instruments, in particular to a firing mechanism and an anastomat.

Background

Staplers generally include an instrument platform and a staple head removably mounted to the platform, which may be passed through a small incision in the body by a penetrator to access a surgical site. Specifically, the instrument platform includes a firing handle, the detachable head includes a staple cartridge assembly and a staple anvil, which are the main components for performing stapling and severing, and a firing mechanism is disposed within the head. Under the drive of the firing handle, the firing mechanism can drive the nail head to complete the suture and incision operation.

In the prior art, the cutter assembly may have left and right deflection in the movement process, which affects the cutting effect on tissues. In addition, the anvil and cartridge assembly are difficult to maintain in an aligned up and down position. Specifically, under the action of external force or when the thickness of the tissue clamped between the nail anvil and the nail bin assembly is uneven, the nail anvil is easy to generate certain dislocation and deflection towards the left side or the right side of the nail anvil relative to the nail bin assembly, so that the nail feet of the anastomotic nails cannot accurately enter a nail anvil forming groove, the anastomotic nails cannot be formed normally or poorly, and the occurrence probability of operation failure or postoperative anastomotic fistula is greatly increased.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to provide a firing mechanism and a stapler, wherein the firing block is matched with a cutter component, so that the cutter component moves along the axial direction of the stapler in the firing process, and the left and right deflection of a nail anvil relative to a nail bin component is reduced.

The embodiment of the invention provides a firing mechanism for a anastomat, which comprises:

the near-end side of the firing block is provided with a clamping groove, and two side walls of the clamping groove respectively form a clamping arm;

the cutter assembly is located on the near-end side of the firing block, a first matching portion is arranged on the far-end side of the cutter assembly, and at least part of the first matching portion enters the clamping groove, so that the clamping arms are located on the left side and the right side of the first matching portion respectively.

In some embodiments, the stapler comprises a cartridge component and an anvil which are oppositely arranged, the anvil surface of the anvil is provided with a cutter groove, the cutter component partially enters the cutter groove, and the cutter component can move along the extending direction of the cutter groove.

In some embodiments, the first mating portion is a wedge-shaped mating portion, and the shape of the catch slot of the firing block conforms to the shape of the wedge-shaped mating portion.

In some embodiments, a width of a proximal side of the first mating portion is greater than a width of a distal side of the first mating portion.

In some embodiments, the first mating portion includes a first sidewall and a second sidewall, a distal side of the first sidewall being inclined relative to a proximal side thereof toward the second sidewall, the second sidewall extending in an axial direction of the stapler.

In some embodiments, the distal side of the first sidewall is connected to the distal side of the second sidewall by a first arcuate surface.

In some embodiments, the catch comprises a third sidewall and a fourth sidewall, a distal side of the third sidewall being inclined relative to a proximal side thereof towards the fourth sidewall, the fourth sidewall extending in an axial direction of the stapler;

the distal side of the third sidewall and the distal side of the fourth sidewall are connected by a second arcuate surface.

In some embodiments, the cutter assembly is an i-shaped cutter assembly comprising an upper beam and a lower beam, the first mating portion being located between the upper beam and the lower beam.

In some embodiments, a cutting edge is disposed between the upper beam and the lower beam of the cutter assembly, and the first mating portion is located between the cutting edge and the lower beam.

In some embodiments, the distal end side of the cutter assembly is further provided with a cutter groove, the proximal end side of the firing block is further provided with a second matching portion, the second matching portion at least partially enters the cutter groove, and two side walls of the cutter groove are located on the upper side and the lower side of the second matching portion.

In some embodiments, the distal side of the upper side wall and the distal side of the lower side wall of the cutter groove each have a third cambered surface.

In some embodiments, the second engagement portion is located on a distal side of the pocket and the first engagement portion is located on a proximal side of the cutter recess.

In some embodiments, the locking slot of the firing block is a wedge-shaped slot, the wedge-shaped slot includes a third sidewall and a fourth sidewall, a distal side of the third sidewall is inclined toward the fourth sidewall relative to a proximal side thereof, and a corresponding clamping arm of the third sidewall is at least partially located inside the cutter recess.

In some embodiments, the firing block is a wedge-shaped block, and the firing block is provided with at least one guide groove, the guide groove extends along the axial direction of the stapler, and the guide groove is matched with a nail cartridge assembly of the stapler to guide the movement of the firing block along the axial direction of the stapler;

the percussion piece includes a plurality of wedges, a plurality of wedges arrange in proper order in the left and right sides direction, the draw-in groove is formed between two wedges at middle part, just the lateral wall of centre gripping arm with the lateral wall parallel and level of two wedges at middle part.

The embodiment of the invention also provides the anastomat which comprises the firing mechanism.

The firing mechanism and the anastomat provided by the invention have the following advantages:

according to the invention, through the matching of the clamping groove of the firing block and the first matching part of the cutter component, the restriction of the movement of the cutter component in the left and right directions is realized by the clamping arm of the firing block, and the cutter component moves axially along the anastomat to reduce the left and right deflection relative to the nail bin component in the firing process, so that the movement stability of the cutter component is maintained, and the operation effect is improved. Further, when the cutter component is matched with the cutter groove in the nail anvil, the nail anvil and the nail bin component are kept aligned up and down through limiting the position of the nail anvil when the cutter component with relatively stable position moves in the cutter groove, so that the nail anvil forming groove and the anastomosis nails in the nail anvil forming groove and the nail bin component are always in a mutually aligned state, the nail feet of the anastomosis nails in the nail bin component can accurately enter the nail anvil forming groove corresponding to the nail anvil forming groove, the excellent rate of the formed anastomosis nails is greatly improved, and the operation risk and the probability of the occurrence of postoperative anastomosis fistula are reduced.

Drawings

Other features, objects and advantages of the present invention will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings.

FIG. 1 is a schematic structural view of a nail head according to an embodiment of the present invention;

FIG. 2 is a side schematic view of the stud portion of one embodiment of the invention;

FIG. 3 is a sectional view taken in the direction A1-A1 of FIG. 2;

FIG. 4 is a schematic view of an anvil according to one embodiment of the present invention;

FIG. 5 is a schematic view of a staple cartridge assembly and firing mechanism in accordance with one embodiment of the present invention;

FIG. 6 is a schematic structural view of a firing mechanism according to an embodiment of the present invention;

FIG. 7 is a schematic structural view of a firing block of one embodiment of the present invention;

FIGS. 8 and 9 are schematic structural views of a cutter assembly according to an embodiment of the present invention;

FIG. 10 is a side view of a cutter assembly according to an embodiment of the invention;

FIG. 11 is a sectional view taken in the direction A2-A2 of FIG. 10;

FIG. 12 is a side view of a firing mechanism of an embodiment of the present invention;

FIG. 13 is a sectional view taken in the direction A3-A3 of FIG. 12;

FIG. 14 is a top view of the firing mechanism of an embodiment of the present invention;

FIG. 15 is a sectional view taken in the direction A4-A4 of FIG. 14;

FIG. 16 is a sectional view taken in the direction A5-A5 of FIG. 14.

Reference numerals:

1 second mating part ofcartridge assembly 35

11proximal side 36 guide groove of cartridge assembly

Distal side 37 wedge of 12 cartridge assembly

13staple cartridge face 4 cutter assembly

2anvil 41 proximal side of the cutter assembly

21 anvilproximal side 42 distal side of cutter assembly

22distal side 43 cutting edge of anvil

23anvil surface 44 first mating portion

First side wall of first fitting part of 24-cutter groove 441

3 second side wall of first mating portion offiring block 442

31 proximal 443 first arc of firing Block

32 firing block distal 45 cutter recess

33card slot 451 upper side wall

Lower side wall ofthird side wall 452 of 331 card slot

332fourth side wall 453 of the card slot and a third cambered surface

333 secondcambered surface 46 crossbeam

34 clamping arm

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.

The invention provides a firing mechanism and an anastomat comprising the same. The anastomat comprises an instrument platform and a nail head detachably mounted on the instrument platform, and the nail head comprises a nail bin assembly and a nail anvil which are oppositely arranged. In an initial state, the firing mechanism is arranged on the proximal end side of the nail head, and when the anastomat is fired, the firing mechanism moves from the proximal end side to the distal end side of the nail head. The firing mechanism includes: the near-end side of the firing block is provided with a clamping groove, and two side walls of the clamping groove respectively form a clamping arm; and the cutter component is positioned on the near-end side of the firing block, a first matching part is arranged on the far-end side of the cutter component, and at least part of the first matching part enters the clamping groove, so that the clamping arms are respectively positioned on the left side and the right side of the first matching part.

Therefore, the invention realizes the limitation of the left and right movement of the cutter component by the clamping arm of the firing block through the matching of the clamping groove of the firing block and the first matching part of the cutter component, and the cutter component moves along the axial direction of the anastomat to reduce the left and right deflection relative to the nail bin component in the firing process, thereby keeping the stability of the movement of the cutter component. Further, when the cutter component is matched with the cutter groove in the nail anvil, the nail anvil and the nail bin component are kept aligned up and down through limiting the position of the nail anvil when the cutter component with relatively stable position moves in the cutter groove, so that the nail anvil forming groove and the anastomosis nails in the nail anvil forming groove and the nail bin component are always in a mutually aligned state, the nail feet of the anastomosis nails in the nail bin component can accurately enter the nail anvil forming groove corresponding to the nail anvil forming groove, the excellent rate of the formed anastomosis nails is greatly improved, and the operation risk and the probability of the occurrence of postoperative anastomosis fistula are reduced.

The structure of the firing mechanism according to various embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the scope of the present invention is not limited by the embodiments.

Fig. 1 to 3 are schematic structural views of a nail head of an anastomat according to an embodiment of the invention. The nail head comprises anail cartridge component 1 and ananvil 2, wherein one side of thenail cartridge component 1 facing theanvil 2 is provided with anail cartridge surface 13, and one side of theanvil 2 facing thenail cartridge component 1 is provided with anail anvil surface 23. A firing mechanism is arranged in the nail head part and comprises afiring block 3 and acutter component 4. In an initial state, the firing mechanism is located on the proximal side of the nail head. When the anastomat is fired, the firing mechanism moves from the near end side to the far end side of the anastomat along the axial direction of the anastomat, thefiring block 3 pushes the anastomotic nails in thenail bin assembly 1 to move towards thenail anvil surface 23 of thenail anvil 2, the anastomotic nails are closed and formed on thenail anvil surface 23, and meanwhile, thecutter assembly 4 cuts tissues to finish the sewing and cutting of the tissues.

In the present invention, the distal side and the proximal side are relative to the operator, and the end closer to the operator is the proximal side, and the end farther from the operator, i.e., the end closer to the surgical site is the distal side. The direction along the axial center of the stapler is an axial direction, i.e., a direction from the distal end side to the proximal end side of the stapler, or a direction from the proximal end side to the distal end side of the stapler. For example, in the viewing angles of fig. 1 to 4, thedistal end side 12 of thecartridge assembly 1 is the left end side of thecartridge assembly 1, and theproximal end side 11 of thecartridge assembly 1 is the right end side of thecartridge assembly 1. Thefar end side 22 of thenail anvil 2 is the left end side of thenail anvil 2, and thenear end side 21 of thenail anvil 2 is the right end side of thenail anvil 2. In the view of fig. 6, thedistal side 32 of thefiring block 3 is the left end side of thefiring block 3, and theproximal side 31 of thefiring block 3 is the right end side of thefiring block 3. The distal end side ofcutter unit 4 is the left end side ofcutter unit 4, the proximal end side ofcutter unit 4 is the right end side ofcutter unit 4. In the present invention, the inner side and the outer side of one member are relative to the axis of the stapler, and the side close to the axis is the inner side and the side far from the axis is the outer side. The axial direction, the up-down direction and the left-right direction of the stapler in this embodiment are three directions perpendicular to each other. In the perspective of fig. 2, the direction from the right side to the left side (or left side to right side) of the drawing is the axial direction of the stapler, the direction from the top to the bottom (or bottom to top) of fig. 2 is the up-down direction of the embodiment, and the direction from the inside to the outside (or outside to the inside) of fig. 2 is the left-right direction of the embodiment.

In this embodiment, in order to keep theknife assembly 4 from swinging left and right relative to thecartridge assembly 1 when moving along the axial direction of the stapler, a matching structure is arranged between the firingblock 3 and theknife assembly 4, and the left and right swinging movement of theknife assembly 4 is limited by thefiring block 3. As shown in FIGS. 5 to 7, a lockingslot 33 is formed on theproximal end 31 of thetrigger block 3, and a clampingarm 34 is formed on each of two side walls of the lockingslot 33. Thecutter assembly 4 is located at theproximal end side 31 of thefiring block 3, thedistal end side 42 of thecutter assembly 4 is provided with afirst matching portion 44, and thefirst matching portion 44 at least partially enters the clampinggroove 33, so that the clampingarms 34 are respectively located at the left side and the right side of thefirst matching portion 44.

Therefore, during the process of firing the anastomat, the clampinggroove 33 of thefiring block 3 is matched with thefirst matching part 44 of thecutter assembly 4, the clampingarm 34 of thefiring block 3 limits the movement of thecutter assembly 4 in the left-right direction, and during the process of firing, thecutter assembly 4 moves along the axial direction of the anastomat to reduce the left-right deflection relative to thenail bin assembly 1, so that the movement stability of thecutter assembly 4 is maintained.

Further, as shown in fig. 3 and 4, theanvil face 23 of theanvil 2 is provided with a knife-cuttingslot 24. Thecutter slot 24 extends in the axial direction of the stapler. The upper end portion of thecutter assembly 4 enters thecutter groove 24, and thecutter assembly 4 is movable in the extending direction of thecutter groove 24. When the stapler is fired, theknife assembly 4 moves along theknife slot 24 from theproximal side 21 of theanvil 2 to thedistal side 22 of theanvil 2. Since the two side walls of thecutter groove 24 are located at the left and right sides of the upper end of thecutter assembly 4, thecutter assembly 4 also defines the left and right positions of theanvil 2 when moving along thecutter groove 24.

Therefore, when thecutter component 4 is matched with thecutter groove 24 in thenail anvil 2, the position of thenail anvil 2 is limited by thecutter component 4 with relatively stable position when moving in thecutter groove 24, so that thenail anvil 2 and thenail bin component 1 are kept aligned up and down, the forming groove on thenail anvil surface 23 and the anastomosis nail in thenail bin component 1 are always in a mutually aligned state, the nail feet of the anastomosis nail in thenail bin component 1 can accurately enter the nail anvil forming groove corresponding to the nail anvil forming groove, the forming yield of the anastomosis nail is greatly improved, and the operation risk and the probability of occurrence of postoperative anastomotic fistula are reduced.

As shown in fig. 5 to 7, in this embodiment, thefiring block 3 is provided with at least oneguide groove 36, theguide groove 36 extends along the axial direction of the stapler, and theguide groove 36 is matched with thecartridge module 1 of the stapler to guide the movement of thefiring block 3 along the axial direction of the stapler. When the anastomat is fired and thefiring block 3 moves from theproximal end side 11 to thedistal end side 12 of thecartridge component 1, theguide groove 36 of thefiring block 3 limits thefiring block 3 not to swing left and right relative to thecartridge component 1, so that the motion stability of thefiring block 3 can be maintained. And thefiring block 3 can further maintain the motion stability of theknife assembly 4 and can maintain the upper and lower alignment of theanvil 2 andcartridge assembly 1 through theknife assembly 4.

Further, as shown in fig. 5 to 7, thefiring block 3 includes a plurality of wedge blocks 37, the plurality of wedge blocks 37 are arranged in sequence in the left-right direction, and theguide groove 36 is formed between two adjacent wedge blocks 37. The distal side of eachwedge block 37 is a staple pushing surface which can push staples in thecartridge assembly 1 to move towards theanvil 2 when moving towards the distal side of thecartridge assembly 1. The lockinggroove 33 is formed between two wedge blocks 37 in the middle. In this embodiment, thefiring block 3 includes four wedge blocks 37: the left and right sides respectively include awedge block 37 located at the outer side and awedge block 37 located at the middle portion. The grippingarms 34 are provided integrally with the wedge blocks 37, and the outer side walls of the grippingarms 34 are flush with the outer side walls of the two wedge blocks 37 of the middle part, i.e. the grippingarms 34 extend proximally from the two wedge blocks 37 of the middle part, so that the positional stability of the grippingarms 34 is higher.

In this embodiment, as shown in fig. 7 to 11, the first engagingportion 44 is a wedge-shaped engaging portion, and the shape of the catchinggroove 33 of thefiring block 3 is adapted to the shape of the wedge-shaped engaging portion, that is, the catchinggroove 33 of thefiring block 3 is a wedge-shaped groove. Through the cooperation that sets up wedge-shaped cooperation portion and wedge groove, on the one hand in anastomat percussion process, can inject the side-to-side movement of wedge-shaped cooperation portion through the wedge groove better, on the other hand when not using the anastomat, can more conveniently withcutter unit spare 4 andpercussion block 3 looks mutual separation.

As shown in FIGS. 8 to 11, the width of the firstfitting portion 44 on the proximal side is larger than the width of the firstfitting portion 44 on the distal side. Upon mating thefiring block 3 with thecutter assembly 4, thefirst mating portion 44 of thedistal side 42 of thecutter assembly 4 may be directly inserted into thecatch 33 from theproximal side 31 of thefiring block 3. When thefiring block 3 needs to be separated from thecutter assembly 4, thecutter assembly 4 can be directly moved towards the proximal direction, so that thefirst matching portion 44 can be separated from the clampinggroove 33 of thefiring block 3. That is, the engagement of thefirst engagement portion 44 and thecatch 33 only limits the left-right direction of thecutter assembly 4, and does not limit the movement of thecutter assembly 4 in the proximal direction with respect to thefiring block 3.

As shown in fig. 8 to 11, the firstfitting portion 44 includes afirst side wall 441 and asecond side wall 442, a distal end side of thefirst side wall 441 is inclined toward thesecond side wall 442 with respect to a proximal end side thereof, and thesecond side wall 442 extends in an axial direction of the stapler. However, the present invention is not limited thereto, and in another alternative embodiment, the distal side of thesecond sidewall 442 may be inclined relative to the proximal side thereof toward thefirst sidewall 441, so that thefirst matching portion 44 forms an approximately conical structure, which also falls within the protection scope of the present invention. In other alternative embodiments, it is within the scope of the present invention that the proximal side of thefirst sidewall 441 is inclined toward thesecond sidewall 442 with respect to the distal side thereof, or that both thefirst sidewall 441 and thesecond sidewall 442 extend in the axial direction of the stapler such that the firstfitting portion 44 forms a structure similar to a rectangle.

As shown in fig. 11, the distal end side of thefirst side wall 441 is connected to the distal end side of thesecond side wall 442 by afirst arc surface 443 to achieve a smooth fit between the firstfitting portion 44 and thecard slot 33.

As shown in fig. 7 and 13, the shape of thecard slot 33 is adapted to the shape of the firstfitting portion 44. Specifically, the lockinggroove 33 includes athird sidewall 331 and afourth sidewall 332, a distal end side of thethird sidewall 331 is inclined toward thefourth sidewall 332 with respect to a proximal end side thereof, and thefourth sidewall 332 extends in an axial direction of the stapler. A distal end side of thethird side wall 331 and a distal end side of thefourth side wall 332 are connected by a secondcurved surface 333 to achieve a smooth fit between the firstfitting portion 44 and thecard slot 33. When it is desired to connect thefiring block 3 and theknife assembly 4, it is sufficient to align theproximal side 31 of thefiring block 3 with thedistal side 41 of theknife assembly 4 and to allow thefirst mating portion 44 to enter thecatch 33. When it is desired to separate thefiring block 3 from theknife assembly 4, theknife assembly 4 may be moved proximally or thefiring block 3 may be moved distally. The first and second

cambered surfaces

443, 333 also provide smoother guidance for the combination and separation of thefiring block 3 and theknife assembly 4.

In other alternative embodiments, when thefirst matching portion 44 has other shapes, theslot 33 is preferably adapted to the shape of thefirst matching portion 44 to achieve better matching with thefirst matching portion 44. For example, when the distal side of thesecond side wall 442 is also inclined toward thefirst side wall 441 relative to the proximal side thereof so that thefirst mating portion 44 forms an approximately tapered structure, the distal side of thefourth side wall 332 of thecard slot 33 may also be inclined toward thethird side wall 331 relative to the proximal side thereof so that thecard slot 33 forms a tapered groove for mating with thefirst mating portion 44. While the proximal side of thefirst sidewall 441 is inclined toward thesecond sidewall 442 with respect to the distal side thereof, the proximal side of thethird sidewall 331 may also be inclined toward thefourth sidewall 332 with respect to the distal side thereof. Alternatively, when thefirst sidewall 441 and thesecond sidewall 442 both extend along the axial direction of the stapler, thethird sidewall 331 and thefourth sidewall 332 of thecard slot 33 may also both extend along the axial direction of the stapler, so that thecard slot 33 forms a slot similar to a rectangle.

As shown in fig. 3 to 4 and 8 to 9, in this embodiment, thecutter assembly 4 is an i-shapedcutter assembly 4 comprising anupper beam 46 and alower beam 46, and theupper beam 46 is matched with thecutter slot 24 of theanvil 2. Thefirst mating portion 44 is located between theupper cross member 46 and thelower cross member 46. Further, acutting edge 43 for cutting tissue is disposed between theupper cross beam 46 and thelower cross beam 46 of thecutter assembly 4, and thefirst matching portion 44 is located between the cuttingedge 43 and thelower cross beam 46, so that the normal operation of thecutting edge 43 is not affected while the motion stability of thecutter assembly 4 is ensured.

Further, when thefiring block 3 moves towards thedistal end side 12 of thecartridge module 1 to push staples, thedistal end side 32 of thefiring block 3 may receive a reaction force generated during staple formation to tilt theproximal end side 31 of thefiring block 3, so that a friction force between the firingblock 3 and the cartridge rack of thecartridge module 1 may be increased, the stapler may not be smoothly operated, and a firing force required in the firing process of the stapler may be increased. To solve this technical problem, in this embodiment, as shown in fig. 7 to 16, thedistal side 42 of thecutter assembly 4 is further provided with acutter groove 45, theproximal side 31 of thefiring block 3 is further provided with asecond matching portion 35, thesecond matching portion 35 at least partially enters thecutter groove 45, thecutter groove 45 comprises anupper side wall 451 and alower side wall 452, and theupper side wall 451 and thelower side wall 452 of thecutter groove 45 are located on the upper side and the lower side of thesecond matching portion 35.

Therefore, through can set upsecond cooperation portion 35 andcutter recess 45 mutually supporting onpercussion block 3 andcutter subassembly 4, the upper and lowerlateral wall 451 of

cutter recess

45, 452 cooperate with the corresponding upper and lower surface ofsecond cooperation portion 35 respectively, whenpercussion block 3 is in the percussion process, whendistal end side 32 ofpercussion block 3 receives the reaction force when the anastomotic nail shaping and makes the near-end side 31 ofpercussion block 3 have the perk trend, the upper and lower lateral wall ofcutter recess 45 exerts the power that keepspercussion block 3 parallel motion to thesecond cooperation portion 35 of near-end side 31 ofpercussion block 3, thereby reduce the frictional force betweenpercussion block 3 and the nail storehouse frame, the percussion force in the apparatus percussion process has been reduced to a certain extent, promote the smooth and easy degree of operation of apparatus.

In this embodiment, as shown in fig. 12 to 16, the secondfitting portion 35 is located on the distal end side of the catchinggroove 33, and the firstfitting portion 44 is located on the proximal end side of thecutter groove 45. Thus, theproximal side 31 of thefiring block 3 and thedistal side 42 of theknife assembly 4 form a defined fit in both a left-right position and an up-down position. The clampinggroove 33 and thecutter groove 45 are mutually embedded, and the triggeringblock 3 and thecutter component 4 are matched in a more stable structure.

Further, as shown in fig. 9, the distal end sides of the upper and

lower side walls

451 and 452 of thecutter groove 45 have thirdcambered surfaces 453, respectively. When it is desired to connect thefiring block 3 and theknife assembly 4, theproximal side 31 of thefiring block 3 is aligned with thedistal side 41 of theknife assembly 4 such that thefirst mating portion 44 enters theslot 33 and thesecond mating portion 35 enters theknife recess 45. When it is desired to separate thefiring block 3 from theknife assembly 4, theknife assembly 4 may be moved proximally or thefiring block 3 may be moved distally. Thethird camber 453 also provides a smoother guide for the combination and separation of thefiring block 3 and theknife assembly 4.

As shown in fig. 15 and 16, thesecond engagement portion 35 at least partially enters thecutter groove 45, and thus, the distance d2 from the distal end side of thecutter groove 45 to theproximal end side 41 of thecutter assembly 4 is greater than the distance d1 from the proximal end side of thesecond engagement portion 35 to theproximal end side 41 of thecutter assembly 4, thereby achieving the snap fit between thesecond engagement portion 35 and thecutter groove 45. The distance d3 from the proximal side of the clampingarm 34 to theproximal side 41 of thecutter assembly 4 is less than the distance d1 from the proximal side of thesecond mating portion 35 to theproximal side 41 of thecutter assembly 4, whereby the clampingarm 34 effects clamping of both the left and right sides of thefirst mating portion 44 of thecutter assembly 4.

As shown in fig. 9 and 13, thecatch 33 of thefiring block 3 is a wedge-shaped slot including athird sidewall 331 and afourth sidewall 332, a distal side of thethird sidewall 331 being inclined toward thefourth sidewall 332 with respect to a proximal side thereof. As seen in fig. 9 and 13, a projection of the clampingarm 34 corresponding to the third side wall 331 (i.e. the clampingarm 34 at the top in the view of fig. 13) on the plane of thelower side wall 452 of thecutter groove 45 at least partially falls within the range of thelower side wall 452 of thecutter groove 45, i.e. the clampingarm 34 corresponding to thethird side wall 331 is at least partially located inside thecutter groove 45. Therefore, the upper and

lower side walls

451, 452 of thecutter groove 45 not only limit the upper and lower surfaces of thesecond engagement portion 35, but also limit at least a part of the upper and lower surfaces of theclamp arm 34 corresponding to thethird side wall 331, thereby realizing a more stable engagement structure between thetrigger block 3 and thecutter assembly 4.

In conclusion, the invention realizes the limitation of the movement of the cutter component in the left and right directions by the clamping arm of the firing block through the matching of the clamping groove of the firing block and the first matching part of the cutter component, and the cutter component moves axially along the anastomat to reduce the left and right deflection relative to the nail bin component in the firing process, thereby keeping the stability of the movement of the cutter component and improving the operation effect.

Further, in the embodiment, when the cutter assembly is matched with the cutter groove in the nail anvil, the nail anvil and the nail bin assembly are kept aligned up and down through the limitation of the cutter assembly with relatively stable position on the position of the nail anvil when moving in the cutter groove, so that the nail anvil forming groove and the anastomosis nails in the nail bin assembly are always in a mutually aligned state, the nail feet of the anastomosis nails in the nail bin assembly can accurately enter the nail anvil forming groove corresponding to the nail anvil forming groove, the excellent rate of anastomosis nail forming is greatly improved, and the operation risk and the probability of occurrence of postoperative anastomosis fistula are reduced.

Further, in this embodiment, can set up second cooperation portion and cutter recess of mutually supporting on percussion piece and cutter unit spare, the upper and lower lateral wall of cutter recess cooperatees with the upper and lower surface of second cooperation portion, when the percussion piece is in the percussion process, when the distal end side of percussion piece received the reaction force when the anastomotic nail shaping and makes the near-end side of percussion piece have the perk trend, the lateral wall of cutter recess is exerted the power that keeps percussion piece parallel motion to the near-end side of percussion piece, thereby reduce the frictional force between percussion piece and the nail storehouse frame, the percussion force in the apparatus percussion process has been reduced to a certain extent, promote the smooth and easy degree of operation of apparatus.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.